Device for maintaining positive pressure in dry dedusting equipment of converter

Abstract

The utility model provides a device for maintaining positive pressure inside dry dust removal equipment of a converter, which belongs to the technical field of dry dust removal of the converter, and is characterized in that gas input ports are arranged at an ash discharge port of an ash scraping device inside an electrostatic dust collector in a dry dust removal process and at the top of a fine ash bin, and are communicated with a gas storage tank; positive pressure inside the ash scraping device and the fine ash bin is maintained through positive pressure gas input from the outside. Compared with a traditional electrostatic dust collection to EP fine ash conveying system, on the basis of an original technology, gas input is added at the ash discharging opening of the dust collector and the top of the ash storage tank, stable positive pressure in the fine ash discharging process is achieved, air is prevented from entering a pipeline, and the effect of sealing and enhancing the electrostatic dust collector and the fine ash bin is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry dust removal of converters, in particular to a device for maintaining positive pressure inside dry dust removal equipment of converters. Background Art

[0002] During the converter blowing process, a large amount of dusty flue gas is generated, and the dust concentration can reach 150-200g / Nm 3 , one ton of steel can produce 10 to 30 kg of dust, which contains more than 50% of total iron and can be recycled. At the same time, in order to safely recover the converter gas, the converter flue gas needs to be dusted and cooled to recycle the dust and gas.

[0003] The converter flue gas treatment processes mainly include dry dust removal process (LT method) and wet dust removal process (OG method). The dry dust removal process has the advantages of low water consumption, no need to treat sewage, low power consumption, stable fan operation, low dust emission concentration (10mg / Nm 3 ) and many other advantages, and is widely used. Its main process flow is as follows: after the converter flue gas is cooled and roughly dusted, it enters the fine dust removal device - electrostatic dust collector after natural cooling through the pipeline, so that the dust content of the converter flue gas is reduced to ≤10mg / Nm 3 The adsorbed fine ash is then discharged from the ash outlet through the scraping device inside the dust collector, and the high-temperature resistant chain conveyor (EP fine ash conveying system) transports the generated dust to the ash storage tank for further reuse.

[0004] Since the converter dust ash contains Tfe and C, the recovered dust ash is stored and transported for recycling. However, during the transportation and storage process, due to the negative pressure on the top of the conveying pipeline and the ash storage tank, the internal oxygen content increases, causing the Fe in it to oxidize. In addition, there is a certain amount of C in the dust ash. Within the temperature range of the equipment, C and O will also react chemically, causing the temperature inside the ash storage tank and the electrostatic dust collection ash conveying pipeline to rise.

[0005] In view of this, it is necessary to design an improved device for maintaining positive pressure inside the converter dry dust removal equipment to solve the above problems. Utility Model Content

[0006] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide a device for maintaining positive pressure inside the converter dry dust removal equipment, so as to solve the problem of excessive temperature caused by negative pressure in the converter dry dust removal process. It can maintain the positive pressure state inside the ash discharge device and the fine ash bin, and enhance the sealing of the equipment and the bin. At the same time, due to the enhanced sealing, the oxygen content inside the equipment is reduced, preventing the dust inside the equipment from being oxidized or chemically reacting.

[0007] To achieve the above-mentioned purpose, the utility model provides a device for maintaining positive pressure inside a converter dry dust removal equipment, comprising an electrostatic precipitator, a fan arranged on the side of the electrostatic precipitator, an ash scraping device arranged at the bottom of the electrostatic precipitator, and a fine ash bin connected to the ash scraping device, wherein a gas input port is respectively arranged at the lower ash port of the ash scraping device and the top of the fine ash bin, and the gas input port is connected to a gas storage tank through a gas delivery pipeline.

[0008] As a further improvement of the present invention, the number of the gas input ports is 2 to 4.

[0009] As a further improvement of the utility model, a ball valve is provided on the gas delivery pipeline.

[0010] As a further improvement of the present invention, the gas storage tank is a nitrogen tank.

[0011] As a further improvement of the utility model, the pressure of the gas input into the converter dry dust removal equipment is 0.4Mpa to 2Mpa.

[0012] As a further improvement of the utility model, the ash scraping device is connected to the fine ash bin through a Z-shaped ash unloading pipeline.

[0013] As a further improvement of the utility model, a pressure gauge is also provided on the top of the fine ash bin.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides a device for maintaining positive pressure inside the converter dry dust removal equipment, including an electrostatic precipitator, a fan arranged on the side of the electrostatic precipitator, an ash scraping device arranged at the bottom of the electrostatic precipitator, and a fine ash bin connected to the ash scraping device. The lower ash port of the ash scraping device and the top of the fine ash bin are respectively provided with gas input ports, and the gas input port is connected to the gas storage tank through a gas delivery pipeline. During the ash discharge process, positive pressure gas is input into the interior of the equipment through the gas input port to maintain the internal positive pressure. In this way, by inputting positive pressure gas, the positive pressure environment inside the ash discharge pipeline is stabilized, and a stable positive pressure can be achieved during the fine ash discharge process, preventing air from entering the pipeline and enhancing the internal sealing of the equipment; at the same time, since the ash temperature is still too high after dust removal, affecting subsequent pulling and sintering, normal temperature gas is introduced into the interior to play a role in cooling and protecting the equipment. Compared with other control methods, this method does not require additional equipment, is low in cost, simple and controllable, and provides a convenient way for safe production of steel enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the structure of a device for maintaining positive pressure inside a converter dry dust removal device.

[0017] Reference numerals

[0018] 1-Electrostatic precipitator; 2-Fan; 3-Dust scraping device; 4-Fine ash bin; 5-Ash unloading pipeline; 6-Gas transmission pipeline; 7-Gas storage tank; 8-Ball valve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0021] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0022] like Figure 1 As shown, the utility model provides a device for maintaining positive pressure inside a converter dry dust removal device, comprising an electrostatic precipitator 1, a fan 2 arranged on a side of the electrostatic precipitator 1, an ash scraping device 3 arranged at the bottom of the electrostatic precipitator 1, and a fine ash bin 4 connected to the ash scraping device 3, and gas input ports are respectively provided at the lower ash opening of the ash scraping device 3 and the top of the fine ash bin 4, and the gas input port is connected to a gas storage tank 7 through a gas delivery pipeline 6.

[0023] The number of gas input ports is preferably 2 to 4, and inert gas is introduced into the interior of the equipment through the gas input ports to reduce the fine ash temperature and maintain a positive pressure inside the equipment to enhance sealing.

[0024] A ball valve 8 is provided on the gas delivery pipeline 6 for controlling the flow rate, pressure and flow direction of the gas. The pressure of the positive pressure gas introduced is preferably 0.4Mpa to 2Mpa.

[0025] The gas storage tank 7 is preferably a nitrogen tank, which uses positive pressure nitrogen to maintain the positive pressure inside the scraping device 3 and the fine ash bin 4.

[0026] The scraping device 3 is connected to the fine ash bin 4 through the Z-shaped ash unloading pipe 5, which can effectively avoid the accumulation of fine ash in the pipe, reduce the blockage of the pipe, and effectively transport the fine ash to the fine ash bin 4.

[0027] A barometer is also provided on the top of the fine ash bin 4 to display the internal pressure of the equipment.

[0028] The utility model can be used in the converter dry dust removal process and the converter semi-dry dust removal process. Compared with the traditional electrostatic dust removal to EP fine ash conveying system, the utility model, on the basis of the original process, increases gas input at the ash outlet of the electrostatic precipitator 1 and the top of the fine ash bin 4 to maintain the internal positive pressure state, which has the effect of enhancing the sealing of the electrostatic precipitator 1 and the fine ash bin 4.

[0029] The device for maintaining positive pressure inside a converter dry dust removal device provided by the utility model is described below in conjunction with specific embodiments.

[0030] Example 1

[0031] Embodiment 1 provides a device for maintaining positive pressure inside a converter dry dust removal device, such as Figure 1 As shown, gas conveying pipelines 6 are respectively installed at the lower ash outlet of the electrostatic precipitator 1 and the top of the fine ash bin 4 of the 150t converter dry dust removal, with a total of two gas input ports.

[0032] The gas used in this embodiment is nitrogen, and the nitrogen gas pressure is 0.5Mpa. During the converter smelting period and the ash discharge process of the fine ash bin 4, the ball valve 8 is always open, and closed at other times. The main components of the converter dust removal fine ash are shown in Table 1.

[0033] Table 1 Components of fine ash from dry dedusting in converter

[0034] project Tf <![CDATA[SiO2]]> CaO MgO <![CDATA[K2O]]> <![CDATA[Al2O3]]> C content 41.3％ 5.34％ 14.3％ 3.19％ 0.13％ 0.97％ 2.55％

[0035] During the 12-hour test, the positive pressure inside the equipment was successfully controlled. According to the barometer record, no negative pressure occurred, which avoided the increase of oxygen content leading to the oxidation of Fe and the chemical reaction of C and O, reduced the risk during the operation of the converter dry dust removal, and during the whole process, the temperature of the fine ash bin was always below 120°C.

[0036] In summary, the device for maintaining positive pressure inside the converter dry dust removal equipment provided by the utility model can reduce and stabilize the fine ash temperature, maintain the positive pressure inside the equipment, and is conducive to safe production.

[0037] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A device for maintaining positive pressure inside a converter dry dust removal device, characterized in that: It includes an electrostatic precipitator, a fan arranged on the side of the electrostatic precipitator, a scraping device arranged at the bottom of the electrostatic precipitator, and a fine ash bin connected to the scraping device. The lower ash outlet of the scraping device and the top of the fine ash bin are respectively provided with gas input ports, and the gas input port is connected to a gas storage tank through a gas delivery pipeline.

2. The device for maintaining positive pressure inside the converter dry dust removal equipment according to claim 1, characterized in that: The number of the gas input ports is 2 to 4.

3. The device for maintaining positive pressure inside the converter dry dust removal equipment according to claim 2, characterized in that: A ball valve is arranged on the gas delivery pipeline.

4. The device for maintaining positive pressure inside the converter dry dust removal equipment according to claim 1, characterized in that: The gas storage tank is a nitrogen tank.

5. The device for maintaining positive pressure inside the converter dry dust removal equipment according to claim 4, characterized in that: The gas pressure input into the converter dry dust removal equipment is 0.4Mpa~2Mpa.

6. The device for maintaining positive pressure inside the converter dry dust removal equipment according to claim 1, characterized in that: The ash scraping device is connected with the fine ash bin through a Z-shaped ash unloading pipeline.

7. The device for maintaining positive pressure inside the converter dry dust removal equipment according to claim 1, characterized in that: A barometer is also provided on the top of the fine ash bin.

Images