Smoke dust content suppression device for top-blown smelting furnace

Abstract

The utility model provides a top-blown smelter smoke dust content suppression device which comprises a feeding belt arranged at a feeding port of a top-blown smelter and a smoke collecting hood, a material pressing mechanism is arranged at one end, far away from the feeding port, of the feeding belt and comprises supports arranged on two sides of the feeding belt, compression rollers are arranged on the supports, and the compression rollers are arranged on the supports. A certain distance is formed between the bottom of the pressing roller and the feeding belt, side baffles are installed on the supports on the two sides, and the height of the side baffles exceeds that of the feeding belt; a spraying device is arranged in the middle of the upper portion of the feeding belt and used for spraying water to the materials on the belt to humidify the materials. The dust content of smoke is reduced, and various problems caused by increase of the ash amount are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of top-blown smelting furnace production, in particular to a device for suppressing dust content in smoke from a top-blown smelting furnace. Background Art

[0002] In modern copper pyrometallurgy, top-blown molten pool smelting is a relatively advanced pyrometallurgical technology. The most representative furnace types are the Ausmelt and ISA furnaces. These furnaces are responsible for smelting copper concentrate, producing high-grade matte, slag, and flue gas with a high concentration of sulfur dioxide. This is a key process in copper smelting. A top-blown smelting furnace uses a top loader to feed a mixture of copper concentrate, related fluxes, and other materials into the furnace through the top charging port. Once this mixture, containing the copper concentrate, enters the molten pool at the bottom of the furnace, a series of physical and chemical reactions rapidly occur, producing matte, slag, and high-temperature flue gas in a short period of time.

[0003] As the high-temperature flue gas is drawn upward by the fan, it carries some splashing droplets from the molten pool and some falling materials into the flue. The particulate matter in the flue gas is eventually intercepted and collected by the waste heat boiler and the electrostatic precipitator. In production, the dust content of the ash is an important process indicator. If the dust content of the ash is too high, it will cause the following problems: First, it will aggravate the coking of the boiler water-cooled wall, affecting the boiler's heat exchange efficiency. In severe cases, it may cause the boiler tube to burst and stop production; second, the amount of boiler ash will increase, which will lead to frequent shutdowns and ash shoveling, affecting production time; third, the amount of electrostatic precipitator ash will increase, and the probability of blockage in the pneumatic conveying system pipeline will increase; fourth, the overall amount of ash will increase, and the amount of ash that needs to be returned to the furnace for disposal will increase, which will consume additional fuel to melt the ash and increase costs. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides a device for suppressing dust content in flue gas from a top-blown melting furnace.

[0005] The specific scheme of the utility model is as follows: a device for suppressing the dust content of flue gas from a top-blown melting furnace, comprising a feeding belt and a smoke collecting hood arranged at the feeding port of the top-blown melting furnace, a pressing mechanism being provided at the end of the feeding belt away from the feeding port, the pressing mechanism comprising brackets arranged on both sides of the feeding belt, pressure rollers being mounted on the brackets, a certain distance being provided between the bottom of the pressure rollers and the feeding belt, side baffles being provided on both sides of the brackets, the height of the side baffles exceeding the height of the feeding belt; a spraying device being provided in the middle above the feeding belt, the spraying device being used to spray water to humidify the material on the belt.

[0006] Preferably, the spray device includes a spray pipe, a plurality of spray heads are provided at the bottom of the spray pipe, a water source is connected to the outside of the spray pipe, and a control valve is installed on the spray pipe.

[0007] Preferably, a pressure sensor is installed in the smoke hood, and an exhaust fan is connected to the outer end of the smoke hood. The exhaust fan is provided with a frequency converter A, and the sensor is connected to the frequency converter A signal.

[0008] Preferably, the driving mechanism of the feeding belt is provided with a frequency converter B, and the frequency converter B is used to adjust the conveying speed of the feeding belt.

[0009] Compared with the prior art, the utility model has the following beneficial effects: reducing the dust content of the flue gas and alleviating various problems caused by the increase of the ash content. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the main view of the utility model;

[0011] Figure 2 yes Figure 1 Side view of;

[0012] Figure 3 yes Figure 2 BB view;

[0013] In the figure: 1. Melting furnace; 2. Fume hood; 3. Feeding belt; 4. Pressing roller; 5. Spraying device; 6. Pressure sensor; 7. Side baffle. DETAILED DESCRIPTION

[0014] like Figure 1-3 As shown, the utility model is a device for suppressing dust content in flue gas from a top-blown melting furnace, comprising a feeding belt 3 and a smoke collecting hood 2 arranged at the feeding port of a smelting furnace 1, a pressing mechanism is provided on the end of the feeding belt 3 away from the feeding port, the pressing mechanism comprises brackets arranged on both sides of the feeding belt 3, pressure rollers 4 are mounted on the brackets, a certain distance is set between the bottom of the pressure rollers 4 and the feeding belt 3, side baffles 7 are mounted on the brackets on both sides, the height of the side baffles 7 exceeds the height of the feeding belt 3; a spray device 5 is provided in the middle above the feeding belt 3, the spray device 5 is used to spray water to humidify the material on the belt.

[0015] Preferably, the spray device 5 includes a spray pipe, a plurality of spray heads are provided at the bottom of the spray pipe, a water source is connected to the outside of the spray pipe, and a control valve is installed on the spray pipe.

[0016] Preferably, a pressure sensor 6 is installed in the smoke hood 2, and an outer end of the smoke hood 2 is connected to an exhaust fan, the exhaust fan is provided with a frequency converter A, and the sensor is connected to the frequency converter A signal.

[0017] Preferably, the driving mechanism of the feeding belt 3 is provided with a frequency converter B, and the frequency converter B is used to adjust the conveying speed of the feeding belt 3.

[0018] The present embodiment also provides a process for suppressing the dust content of flue gas from a top-blown melting furnace, which uses the above-mentioned device for suppressing the dust content of flue gas, including the following measures: compacting the material on the feeding belt 3 by a pressing mechanism to make the material compact; spraying water on the material by a spraying device 5 so that the surface of the material contains a certain amount of water to reduce particulate matter from being sucked into the smoke hood 2; and reducing the conveying speed of the feeding belt 3 to reduce the material flying when entering the furnace.

[0019] Furthermore, the following measures are also included: when adding materials, the speed of the exhaust fan is adjusted to control the negative pressure in the smoke hood 2 at the feeding port within the range of -10Pa~-20Pa, so as to reduce the smoke extraction rate and thus reduce the smoke dust rate.

[0020] Furthermore, the following measures are also included: increasing the oxygen content of the gas injected into the furnace by the spray gun to effectively reduce the amount of flue gas generated by the reaction in the furnace, thereby reducing the amount of particulate matter carried away by the flue gas.

[0021] After adopting the utility model, the amount of smoke ash generated every day is greatly reduced, the interval time of stopping the furnace for shoveling ash is extended by more than double, the production efficiency is improved, and the economic benefits are enhanced.

Claims

1. A device for suppressing dust content in flue gas from a top-blown melting furnace, characterized by: It includes a feeding belt and a smoke collecting hood arranged at the feeding port of the top-blown melting furnace. A pressing mechanism is provided at the end of the feeding belt away from the feeding port. The pressing mechanism includes brackets arranged on both sides of the feeding belt. Pressure rollers are installed on the brackets. A certain distance is set between the bottom of the pressure roller and the feeding belt. The brackets on both sides are equipped with side baffles. The height of the side baffles exceeds the height of the feeding belt. A spray device is provided in the middle above the feeding belt. The spray device is used to spray water to humidify the material on the belt.

2. The device for suppressing dust content in flue gas from a top-blown melting furnace according to claim 1, characterized in that: The spraying device comprises a spraying pipe, a plurality of spray heads are arranged at the bottom of the spraying pipe, a water source is connected to the outside of the spraying pipe, and a control valve is arranged on the spraying pipe.

3. The device for suppressing dust content in flue gas from a top-blown melting furnace according to claim 1, characterized in that: A pressure sensor is installed in the smoke hood, and an outer end of the smoke hood is connected to an exhaust fan, the exhaust fan is provided with a frequency converter A, and the sensor is connected to the frequency converter A signal.

4. The device for suppressing dust content in flue gas from a top-blown melting furnace according to claim 1, characterized in that: The driving mechanism of the feeding belt is provided with a frequency converter B, which is used to adjust the conveying speed of the feeding belt.

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