A regenerative high-temperature molten dust removal device for an electrofused magnesia smelting furnace and its usage method

Abstract

The present invention relates to the field of heat accumulators and dust collectors, and in particular to a heat storage type high-temperature molten dust removal device for an electric molten magnesium smelting furnace and a method for using the device. A clean air chamber, a filter dust removal heat storage body, and a heat exchanger are sequentially arranged from top to bottom within the heat insulation housing of the device. The filter dust removal heat storage body and the heat exchanger are connected to each other through a hot air pipeline. The filter dust removal heat storage body is a molten magnesium sand heat storage plate vertically arranged in the dust removal filter. The clean air chamber is arranged above the filter dust removal heat storage body. The clean air chamber and the outlet of the heat exchanger are connected to each other through a pipeline. The heat insulation housing is provided with an air inlet on the lower left side of the filter dust removal heat storage body, and the air inlet is connected to the filter dust removal heat storage body. The heat insulation housing is provided with an exhaust port on the right side of the clean air chamber, and the exhaust port is connected to the clean air chamber. The present invention reduces the need for air mixing and cooling in general dust collectors, and waste heat energy is utilized. The dust removal and heat storage dust removal filter bodies can withstand high temperatures of about 1500°C and can "shift peaks and fill valleys" in electricity consumption.

Description

Technical Field

[0001] The present invention relates to the field of heat accumulators and dust collectors, and in particular to a heat storage type high-temperature dust removal device for an electric magnesium smelting furnace and a use method thereof. Background Art

[0002] Currently, bag-type dust collectors are widely used in the dust removal and environmental protection fields. Some patents also disclose plastic-sintered plate dust collectors. These dust collectors are characterized by ease of use and high dust removal efficiency. Plastic-sintered plate dust collectors also have large filtration areas and strong acid and alkali resistance. However, these designs have the following problems and disadvantages: the filter bags or filter plates cannot withstand temperatures above 300°C. The heat resistance temperature of both normal-temperature and high-temperature bag filter media is within 300°C. According to the "Bag-Type Dust Collector Accessory Selection Manual," products made of plastic-sintered filter plates are currently mainly heat-resistant at 70°C and 160°C. The molten dust emitted by fused magnesium furnaces used in general production is generally high-temperature. These dust collectors require cooling this high-temperature dust by adding cold air before dust removal, which not only increases costs but also wastes a large amount of heat energy. Currently, there is no device that integrates dust removal and heat storage, which wastes high-temperature waste heat. Summary of the Invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a heat storage type high-temperature molten dust removal device for an electric molten magnesium smelting furnace, which can withstand high temperatures of about 1500°C, is wear-resistant, pressure-resistant, and adaptable to changes in hot and cold environments, and in particular can recycle high-temperature waste heat and integrate heat storage and dust removal, and a method for using the same. This device solves the problem that filter bags or filter plate dust collectors cannot withstand temperatures above 300°C, and that the high-temperature molten dust is cooled by mixing with cold air and then dusted, which not only increases costs but also wastes a large amount of heat energy.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A regenerative high-temperature dust removal device for a fused magnesium smelting furnace includes an air inlet, a heat-insulating casing, an exhaust port, a heat exchanger, a clean air chamber, and a filter dust removal and heat storage body. The specific structure is as follows:

[0006] A clean air chamber, a filtering dust removal heat storage body, and a heat exchanger are arranged in sequence from top to bottom in the insulation casing. The filtering dust removal heat storage body is arranged above the heat exchanger, and the filtering dust removal heat storage body and the heat exchanger are communicated with each other through a hot air pipeline; the filtering dust removal heat storage body is an electric fused magnesia heat storage plate vertically arranged in the dust removal filter, and the clean air chamber is arranged above the filtering dust removal heat storage body, and the clean air chamber and the outlet of the heat exchanger are connected to each other through a pipeline; the insulation casing is provided with an air inlet on the lower left side of the filtering dust removal heat storage body, and the air inlet is communicated with the filtering dust removal heat storage body. The insulation casing is provided with an exhaust port on the right side of the clean air chamber, and the exhaust port is communicated with the clean air chamber.

[0007] The thermal storage type high temperature dust removal device for the molten magnesium smelting furnace has a filtering dust removal and thermal storage body which is an integrated structure of solid dust removal and solid thermal storage.

[0008] The thermal storage type high temperature melting dust removal device of the fused magnesium smelting furnace and the fused magnesia heat storage plate are solid heat storage methods that combine high temperature flue gas heat storage and electric heat storage.

[0009] The regenerative high-temperature dust removal device for the molten magnesium smelting furnace has a dust collecting box arranged below the dust filtering and heat accumulator, and the dust collecting box and the dust removal port of the dust removal filter of the dust filtering and heat accumulator are connected to each other through a closed pipeline.

[0010] The regenerative high-temperature dust removal device for the molten magnesium smelting furnace comprises a dust removal filter for filtering the dust removal heat storage body and a molten magnesia heat storage plate which is a plate structure made of molten magnesia.

[0011] The heat storage type high temperature dust removal device of the molten magnesium smelting furnace is provided with an electric heating group in the molten magnesia heat storage plate.

[0012] The method for using the regenerative high-temperature molten dust removal device for an electric molten magnesium smelting furnace is as follows: a heat-insulating casing surrounds a filtering dust removal heat storage body, a heat exchanger, and a clean air chamber inside the casing; high-temperature molten dust generated during production enters the filtering dust removal heat storage body from an air inlet; the filtered high-temperature molten dust is circulated and stored in the filtering dust removal heat storage body; dust is retained outside the filtering dust removal heat storage body and falls into a dust collection box under the action of gravity; when too much dust is attached to the surface of the filtering dust removal heat storage body, the dust is blown into the dust collection box; the hot air heated by the electric molten magnesia sand heat storage plate exchanges heat with the heat exchanger for cooling, forming clean air, which is discharged through the clean air chamber and the exhaust port; the filtering dust removal heat storage body is connected to the heat exchanger through a hot air pipeline.

[0013] The method for using the regenerative high-temperature molten dust removal device for the molten magnesium smelting furnace is as follows: the high-temperature molten dust enters the filtering dust removal heat storage body, is filtered and stored in the molten magnesia heat storage plate of the filtering dust removal heat storage body for heating and energy storage, or the electric heating group is started during low electricity consumption to store heat and energy in the molten magnesia heat storage plate of the filtering dust removal heat storage body.

[0014] The method for using the thermal storage type high-temperature dust removal device of the electric magnesium smelting furnace is as follows: the heat exchanger outputs the heat energy in the filtering dust storage body to the load device as needed, or outputs it to the production for self-use as needed, or supplies it to the heating system, hot water system or drying system.

[0015] The method for using the regenerative high-temperature molten dust removal device of the molten magnesium smelting furnace is used for regenerative dust removal of high-temperature molten dust above 1000°C.

[0016] The advantages and beneficial effects of the present invention are:

[0017] 1. Due to the adoption of a solid plate structure of fused magnesium with integrated dust removal and heat storage, the present invention, as an integrated dust removal and heat storage device, can store the heat energy of the high-temperature molten dust while removing and purifying it, and output it to production for self-use as needed, and can also provide heating, hot water supply, drying and other systems.

[0018] 2. The present invention reduces the need for air mixing and cooling in general dust collectors, and the waste heat energy is utilized. The dust removal and heat storage dust removal filter bodies can withstand high temperatures of about 1500°C and can "shift peaks and fill valleys" in electricity consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 . This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 . It is a schematic side view of the structure of the present invention;

[0021] In the figure, 1 is the air inlet, 2 is the heat-insulating casing, 3 is the exhaust port, 4 is the dust removal filter, 5 is the fused magnesia heat storage plate, 6 is the heat exchanger, 7 is the dust collection box, 8 is the clean air chamber, 9 is the dust-filtering heat storage body, and 10 is the closed pipeline. DETAILED DESCRIPTION

[0022] Hereinafter, the present invention will be described in further detail with reference to the accompanying drawings.

[0023] like Figure 1-Figure 2 As shown, the present invention is a regenerative high-temperature dust removal device for a molten magnesium smelting furnace, which mainly includes an air inlet 1, a heat-insulating casing 2, an exhaust port 3, a heat exchanger 6, a dust collecting box 7, a clean air chamber 8, a filtering dust removal heat storage body 9, etc. The specific structure is as follows:

[0024] A clean air chamber 8, a filtering dust removal heat storage body 9, and a heat exchanger 6 are sequentially arranged in the heat preservation casing 2 from top to bottom. The filtering dust removal heat storage body 9 is arranged above the heat exchanger 6, and the filtering dust removal heat storage body 9 and the heat exchanger 6 are communicated with each other through a hot air pipeline; the filtering dust removal heat storage body 9 is a fused magnesia heat storage plate 5 vertically arranged in the dust removal filter 4, and the fused magnesia heat storage plate 5 is provided with an electric heating group, which can use relatively cheap low-valley electricity to heat the fused magnesia heat storage plate 5; the clean air chamber 8 is arranged above the filtering dust removal heat storage body 9, and the clean air chamber 8 and the outlet of the heat exchanger 6 are connected to each other through a pipeline; the heat preservation casing 2 is provided with an air inlet 1 on the lower left side of the filtering dust removal heat storage body 9, and the air inlet 1 is connected to the filtering dust removal heat storage body 9, and the heat preservation casing 2 is provided with an exhaust port 3 on the right side of the clean air chamber 8, and the exhaust port 3 is communicated with the clean air chamber 8. The dust collecting box 7 is arranged below the filtering dust removal heat storage body 9, and the dust collecting box 7 and the dust removal port of the dust removal filter 4 of the filtering dust removal heat storage body 9 are connected to each other through a closed pipeline 10.

[0025] The dust filter 4 and the fused magnesia heat storage plate 5 of the dust-filtering and dust-removing heat storage body 9 are plate-type structures made of fused magnesia, which can withstand temperatures exceeding 1500°C. Fused magnesia has a wide range of applicability due to its high melting point, high specific heat capacity, strong slag resistance, erosion resistance, high compressive strength, high high-temperature strength, stable chemical properties, and corrosion resistance.

[0026] The working principle and working process of the present invention are as follows:

[0027] like Figure 1-Figure 2 As shown, the heat-insulating casing 2 surrounds the filter dust removal heat storage body 9, the heat exchanger 6, and the clean air chamber 8. The high-temperature molten dust generated during production enters the filter dust removal heat storage body 9 from the air inlet 1. The filtered high-temperature molten dust is circulated and stored in the filter dust removal heat storage body 9. The dust is retained outside the filter dust removal heat storage body 9 and falls into the dust collection box 7 under the action of gravity. When there is too much dust on the surface of the filter dust removal heat storage body 9, the dust is blown into the dust collection box 7. The high-temperature molten dust entering the filter dust removal heat storage body 9 is filtered and stored to heat and store energy in the fused magnesia heat storage plate 5 of the filter dust removal heat storage body 9, or the electric heating group is started during low electricity consumption to store heat and energy in the fused magnesia heat storage plate 5 of the filter dust removal heat storage body 9. The hot air heated by the fused magnesia heat storage plate 5 exchanges heat with the heat exchanger 6 for cooling, forming clean air, which is discharged through the clean air chamber 8 and the exhaust port 3; the filter dust removal heat storage body 9 is connected to the heat exchanger 6 through a hot air pipeline, and the heat exchanger 6 outputs the heat energy in the filter dust removal heat storage body 9 to the load device as needed, and outputs it to the production for self-use as needed, and can also be used for heating, hot water supply, drying and other systems.

[0028] The results show that the present invention reduces the need for air mixing and cooling in general dust collectors, solves the high temperature resistance problem encountered by bag dust collectors in high-temperature smelting of molten magnesium, and stores and utilizes wasted heat energy, which is highly efficient and energy-saving and has a wide range of uses.

Claims

1. A regenerative high-temperature dust removal device capable of withstanding 1500°C molten magnesium smelting furnace, characterized in that: The device includes an air inlet, a heat-insulating casing, an exhaust port, a heat exchanger, a clean air chamber, a filter, dust removal and heat storage body. The specific structure is as follows: A clean air chamber, a filter dust removal heat storage body, and a heat exchanger are sequentially arranged in the heat insulation casing from top to bottom. The filter dust removal heat storage body is arranged above the heat exchanger, and the filter dust removal heat storage body and the heat exchanger are communicated with each other through a hot air pipeline; the filter dust removal heat storage body is a fused magnesia heat storage plate vertically arranged in the dust removal filter, the clean air chamber is arranged above the filter dust removal heat storage body, and the clean air chamber and the outlet of the heat exchanger are connected to each other through a pipeline; the heat insulation casing is provided with an air inlet on the lower left side of the filter dust removal heat storage body, and the air inlet is communicated with the filter dust removal heat storage body. The heat insulation casing is provided with an exhaust port on the right side of the clean air chamber, and the exhaust port is communicated with the clean air chamber; The filtering dust removal and heat storage body is an integrated structure of solid dust removal and solid heat storage; The fused magnesia heat storage plate is a solid heat storage method that combines high-temperature flue gas heat storage and electric heat storage; The dust removal filter and the fused magnesia heat storage plate for filtering the dust removal heat storage body are plate structures made of fused magnesia; The fused magnesia heat storage plate is equipped with an electric heating group; The heat-insulating casing surrounds the filter dust removal heat storage body, heat exchanger, and clean air chamber. The high-temperature molten dust generated during production enters the filter dust removal heat storage body from the air inlet. The filtered high-temperature molten dust is circulated and stored in the filter dust removal heat storage body. The dust is retained outside the filter dust removal heat storage body and falls into the dust collection box under the action of gravity. When there is too much dust attached to the surface of the filter dust removal heat storage body, the dust is blown into the dust collection box. The hot air heated by the fused magnesia heat storage plate exchanges heat with the heat exchanger and cools down to form clean air, which is discharged through the clean air chamber and exhaust port. The filter dust removal heat storage body is connected to the heat exchanger through a hot air pipeline. The dust collecting box is arranged below the dust-removing heat storage body, and the dust collecting box and the dust removal port of the dust removal filter of the dust-removing heat storage body are connected to each other through a closed pipeline.

2. A method for using the regenerative high-temperature dust removal device capable of withstanding 1500°C in a molten magnesium smelting furnace according to claim 1, characterized in that: The heat-insulating casing surrounds the filter dust removal heat storage body, heat exchanger, and clean air chamber. The high-temperature molten dust generated during production enters the filter dust removal heat storage body from the air inlet. After being filtered, the high-temperature molten dust is circulated and stored in the filter dust removal heat storage body. The dust is retained outside the filter dust removal heat storage body and falls into the dust collection box under the action of gravity. When there is too much dust attached to the surface of the filter dust removal heat storage body, the dust is blown into the dust collection box through spraying. The hot air heated by the fused magnesia heat storage plate exchanges heat with the heat exchanger to form clean air after cooling. The clean air is discharged through the clean air chamber and exhaust port. The filtering dust removal heat storage body is connected to the heat exchanger through a hot air pipeline.

3. The method for using the regenerative high-temperature dust removal device capable of withstanding 1500°C molten magnesium smelting furnace according to claim 2, characterized in that: The high-temperature molten dust that enters the filter dust removal heat storage body is filtered and stored to heat the fused magnesia heat storage plate of the filter dust removal heat storage body for energy storage, or the electric heating group is started during low electricity consumption to store heat and energy in the fused magnesia heat storage plate of the filter dust removal heat storage body.

4. The method for using the regenerative high-temperature dust removal device for a 1500°C molten magnesium smelting furnace according to claim 2, characterized in that: The heat exchanger outputs the heat energy in the filter dust removal heat storage body to the load device as needed, or outputs it to production for self-use as needed, or supplies it to the heating system, hot water system or drying system.

Images