A kind of sky flash heat exchange dust collector

Abstract

The present invention provides a sky-flash heat exchange dust collector, comprising a shell provided with a hot flue gas inlet, a hot flue gas outlet, a cool air inlet, and a cool air outlet, and a plurality of hot flue gas channels and a plurality of cool air channels provided in the inner cavity of the shell; the heat-conducting partition between the hot flue gas channel and the cool air channel is composed of a heat-conducting brick wall and a metal heat-conducting plate connected in series; the hot flue gas channel at one end of the heat-conducting brick wall is connected to the hot flue gas inlet, and the hot flue gas channel at one end of the metal heat-conducting plate is connected to the hot flue gas outlet; the cool air channel at one end of the metal heat-conducting plate is connected to the cool air inlet, and the cool air channel at one end of the heat-conducting brick wall is connected to the cool air outlet. The sky-flash heat exchange dust collector described in the present invention can directly handle the heat exchange between high-temperature gas above 1000°C and low-temperature gas, solving the problem that the existing mainstream heat exchanger has a small operating temperature range and the long-term stable operating temperature cannot exceed 1000°C.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers, and in particular relates to a skylight heat exchange dust collector. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers play an important role in industrial production in industries such as metallurgy, chemical industry, petroleum, power, and food. They can be used as heaters, coolers, condensers, evaporators, and reboilers, and are widely used. However, the current mainstream heat exchangers generally use metal as a heat-conducting partition wall, and the fluid involved in heat exchange usually contains acidic substances. Due to the limited high temperature resistance and corrosion resistance of metals at high temperatures, the long-term stable working temperature limit of the heat exchanger generally does not exceed 1000°C.

[0003] In recent years, the flue gas temperature of some high-efficiency metallurgical furnaces developed and used is relatively high. The flue gas of a few furnaces is even close to 2000℃, which makes it impossible to directly use the existing heat exchanger to recover heat energy. If large equipment such as waste heat boilers is used to reduce the flue gas to below 1000℃ and then use the heat exchanger, the project investment will increase significantly. In addition, the current mainstream heat exchangers do not have dust removal functions and are only suitable for heat exchange of clean gases. The high-temperature flue gas of metallurgical furnaces usually contains a high amount of smoke dust. If it directly enters the heat exchanger, it is easy to cause pipeline blockage and affect the stable operation of production. Summary of the invention

[0004] In view of this, the present invention aims to propose a skylight heat exchange dust collector to solve the problem that the stable operating temperature of existing heat exchange equipment is lower than 1000°C and dust cannot be effectively removed.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A sky-flash heat exchange dust collector, comprising a shell provided with a hot flue gas inlet, a hot flue gas outlet, a cool air inlet, and a cool air outlet, and a plurality of hot flue gas channels and a plurality of cool air channels provided in the inner cavity of the shell, wherein heat exchange is performed between the hot flue gas channels and the cool air channels; a heat-conducting partition between the hot flue gas channels and the cool air channels is composed of a heat-conducting brick wall and a metal heat-conducting plate connected in series; the hot flue gas channel located at one end of the heat-conducting brick wall is connected to the hot flue gas inlet, and the hot flue gas channel located at one end of the metal heat-conducting plate is connected to the hot flue gas outlet; the cool air channel located at one end of the metal heat-conducting plate is connected to the cool air inlet, and the cool air channel located at one end of the heat-conducting brick wall is connected to the cool air outlet; a dust bin is provided at the bottom of the shell, the bottom of the hot flue gas channel is communicated with the dust bin, and the cool air channel is not communicated with the dust bin.

[0007] When the dusty high-temperature flue gas flows along the tortuous hot flue gas channel, most of the smoke falls into the dust bin due to the continuous changes in flow velocity and direction, while the cool air channel is not connected to the dust bin, thus avoiding the connection between the two gases.

[0008] Furthermore, the series connection mode between the heat-conducting brick wall and the metal heat-conducting plate is an insertion type or a covering type. The insertion type is that one end of the metal heat-conducting plate connected to the heat-conducting brick wall is inserted into the heat-conducting brick wall; the covering type is that one end of the metal heat-conducting plate connected to the heat-conducting brick wall is covered on the wall end of the heat-conducting brick wall through a channel steel structure.

[0009] Furthermore, the material of the thermal conductive brick wall is one or more of beryllium oxide, boron nitride, aluminum nitride, silicon nitride, silicon carbide, magnesium oxide or a composite material of these materials; the metal thermal conductive plate is one of a copper plate, a stainless steel plate, a carbon steel plate or a titanium alloy plate.

[0010] Due to the need for excellent heat conduction, the thermal conductivity of the materials used to make the thermal conductive brick wall is required to be high; due to the need to connect with the metal heat conducting plate, the insulation performance of the materials used to make the thermal conductive brick wall is required to be good; the high temperature working environment with acidic gas and dust requires the materials used to make the thermal conductive brick wall to have a high melting point, good wear resistance and corrosion resistance. Ceramic materials such as beryllium oxide, boron nitride, aluminum nitride, silicon nitride, silicon carbide, and magnesium oxide can well meet the requirements of high temperature resistance, corrosion resistance, wear resistance, high resistivity, and high thermal conductivity. In addition, ceramic materials can also effectively reduce the probability of dust adhering to the walls of the thermal conductive brick wall, preventing the thermal transfer efficiency of the thermal conductive brick wall from gradually decreasing.

[0011] The heat-conducting brick wall can be built by block refractory bricks or spliced ​​by formed plates made of composite materials, or it can be cast as a whole by refractory materials.

[0012] Furthermore, the metal heat-conducting plate is one or both of a zigzag structure or a wavy structure in the gas flow direction; the heat-conducting brick wall is one or more of a straight-line structure, a zigzag structure or a wavy structure in the gas flow direction.

[0013] The shapes of the heat-conducting brick wall and the metal heat-conducting plate may be the same or different.

[0014] Furthermore, the length of the heat-conducting brick wall section of the heat-conducting partition wall ranges from 5m to 60m.

[0015] The length of the heat-conducting brick wall section of the heat-conducting partition is related to the material of the heat-conducting brick wall selected. If the heat-conducting brick wall is made of SiC, the length of the heat-conducting brick wall section ranges from 10m to 60m; if the heat-conducting brick wall is made of beryllium oxide, boron nitride, aluminum nitride or silicon nitride composite materials, carbon fiber composite silicon carbide, silicon carbide fiber composite silicon carbide, the length of the heat-conducting brick wall section ranges from 5m to 40m.

[0016] Furthermore, there are two dust bins, namely a first dust bin and a second dust bin. The first dust bin is located below the hot flue gas channel at one end of the heat-conducting brick wall, and the second dust bin is located below the hot flue gas channel at one end of the metal heat-conducting plate. The first dust bin is not connected to the second dust bin.

[0017] Furthermore, a direct current power supply system is provided, and the direct current power supply system is connected to the metal heat conductive plate. Through the control of the direct current power supply system, the charged polarities of the metal heat conductive plates on both sides of the hot flue gas channel are opposite, and the charged polarities of the metal heat conductive plates on both sides of the cool air channel are the same.

[0018] The specific implementation method is to simultaneously connect the metal heat conductive plates on both sides of a certain cool air channel to one pole of the DC power supply system, such as the positive pole, and simultaneously connect the metal heat conductive plates on both sides of the adjacent cool air channel to the other pole of the DC power supply system, such as the negative pole, and so on. Then, the metal heat conductive plates on both sides of the cool air channel have the same electrical polarity, while the metal heat conductive plates on both sides of the hot flue gas channel have opposite electrical polarities, thereby forming an inter-plate electric field in the hot flue gas channel space. At this time, the metal heat conductive plate is both a heat conductive plate of the heat exchanger and an electrode plate of the electrostatic precipitator. When the dust-containing hot flue gas passes through the electric field between the hot flue gas channels, the dust particles will hang on the metal heat conductive plates, and some of them will fall after agglomeration and weight increase and be collected by the dust bin; a small amount of dust particles that do not fall and continue to adhere to the metal heat conductive plates can be removed by conventional methods, including but not limited to vibration or air guns.

[0019] Furthermore, the DC power supply system includes a transformer and a rectifier.

[0020] Furthermore, the DC power supply system includes an electrical polarity conversion circuit, which can cause the electrical polarity of the metal heat conductive plate to change periodically.

[0021] The cool air in the cool air channel is relatively clean, and generally has a low dust content. Since the metal heat conducting plates on both sides of the cool air channel are connected to electrodes of the same polarity, there is no electric field force, and the neutral dust particles contained in the cool air will not adhere to the metal heat conducting plates, but will flow with the airflow. The dust particles with static electricity in the cool air may partially adhere to the metal heat conducting plates. For example, positively charged dust particles may adhere to negatively charged metal heat conducting plates, and negatively charged dust particles may adhere to positively charged metal heat conducting plates. By periodically changing the electrical properties of the metal heat conducting plates on both sides of the cool air channel, when the electrical polarity of the metal heat conducting plates is the same as the electrical properties of the attached dust particles, a repulsive force will be generated on the dust particles, pushing the dust particles attached to the metal heat conducting plates before the electrical properties are changed into the airflow, flowing with the airflow and being carried away; at the same time, the electrical polarity of the metal heat conducting plates on both sides of the adjacent cool air channels also changes synchronously, always ensuring that the electrical polarity of the metal heat conducting plates on both sides of the cool air channel is the same, and the electrical polarity of the metal heat conducting plates on both sides of the hot flue gas channel is opposite. By periodically changing the charged polarity of the metal heat conducting plate in the cool air channel, dust particles on the metal heat conducting plates on both sides of the cool air channel can fall off and will not adhere to the metal poles, thereby keeping the surface of the metal heat conducting plates clean, reducing heat conduction losses and increasing heat exchange efficiency.

[0022] The hot flue gas of the flash metallurgical device usually has a high dust content. For the hot flue gas channel, since the metal heat conducting plates on both sides are connected to opposite electrodes, a strong electric field is formed in the hot flue gas channel, which ionizes the dusty gas passing through. After the dust particles combine with the charged ions, they move toward the opposite metal heat conducting plates under the force of the electric field and are finally adsorbed on the metal heat conducting plates. By periodically changing the charged polarity of the metal heat conducting plates, the adsorbed dust particles are repelled and fall off, and most of them fall into the dust bin at the bottom of the hot flue gas channel. By continuously changing the charged polarity of the metal heat conducting plates, the smoke is continuously adsorbed, falls off and falls into the dust bin, thereby achieving a good dust removal effect.

[0023] Furthermore, a vibration-type ash dropping device or a gas cannon-type ash dropping device is provided in the hot flue gas channel.

[0024] The working principle of the sky flash heat exchange dust collector is as follows: hot flue gas enters the hot flue gas channel from the hot flue gas inlet and flows along the hot flue gas channel toward the hot flue gas outlet. Cool air enters the cool air channel from the cool air inlet and flows along the cool air channel in the opposite direction of the hot flue gas. The hot flue gas and the cool air use the heat-conducting brick wall and the metal heat-conducting plate as heat-conducting partitions to continuously exchange heat. Finally, the hot flue gas is discharged from the hot flue gas outlet after heat release and cooling, and the cool air is discharged from the cool air outlet after heat absorption and heating. When the hot flue gas flows along the tortuous hot flue gas channel, due to the continuous changes in flow velocity, direction and pressure, some large particles of smoke and dust fall into the dust bin under the action of gravity. After the small particles of smoke in the hot flue gas enter the metal heat exchange section of the sky flash heat exchange dust collector, the strong electric field is formed between the metal heat conduction plates on both sides, which makes the dust particles charged. Under the action of the electric field, the dust particles are adsorbed onto the metal heat conduction plates with opposite charges. By controlling the periodic change of the electric field and the supporting mechanical vibration, most of the dust particles in the hot flue gas fall into the smoke dust bin.

[0025] Compared with the prior art, the sky flash heat exchange dust collector of the present invention has the following advantages:

[0026] (1) The heat-conducting partition wall of the sky-flash heat exchange dust collector described in the present invention is composed of a heat-conducting brick wall and a metal heat-conducting plate connected in series. The high-temperature flue gas first exchanges heat with the cool air in the heat-conducting brick wall section, and then enters the metal heat-conducting plate section for further cooling after being cooled to below 1000°C (optimally to below 800°C) by the heat-conducting brick wall section. Since the heat-conducting brick wall can work stably for a long time at a high temperature above 1000°C, and the metal heat-conducting plate can work stably for a long time below 1000°C, the sky-flash heat exchange dust collector described in the present invention can directly handle the heat exchange between high-temperature gas above 1000°C and low-temperature gas, thereby solving the problem that the existing mainstream heat exchanger has a small operating temperature range and the long-term stable operating temperature cannot exceed 1000°C.

[0027] (2) The hot flue gas passage of the skylight heat exchanger dust collector described in the present invention can present different shapes of curved flow passages according to the different bending shapes of the heat-conducting partition walls. Combined with the dust bin arranged below the hot flue gas passage, part of the smoke in the flue gas can be removed, thereby solving the problem that the existing mainstream heat exchanger cannot remove dust or has poor dust removal effect.

[0028] (3) The flash heat exchange dust collector described in the present invention not only removes dust in the curved flow channel, but also adds an electrostatic dust removal method, creatively realizing the superposition of two sets of dust removal methods, which can remove most of the smoke in the flue gas and solve the pain points of the existing mainstream heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the external structure of the skylight heat exchange dust collector described in Example 1 of the present invention;

[0031] Figure 2 This is a schematic structural diagram of the heat-conducting partition wall of the skylight heat exchange dust collector described in Example 1 of the present invention;

[0032] Figure 3 This is a schematic structural diagram of the heat-conducting brick wall described in Example 1 of the present invention;

[0033] Figure 4 for Figure 1 Left view of the internal structure at MM;

[0034] Figure 5 This is a schematic structural diagram of a heat-conducting partition wall of a skylight heat exchange dust collector according to Example 2 of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the direct current power supply system according to Embodiment 2 of the present invention;

[0036] Figure 7 Schematic diagram of the structure of the electric polarity conversion circuit according to Embodiment 2 of the present invention;

[0037] Figure 8 The present invention is a schematic diagram of a process flow for treating exhaust gas from a flash furnace steelmaking process using the flash furnace heat exchange dust collector described in the present invention.

[0038] Description of reference numerals:

[0039] 1-hot flue gas inlet; 2-hot flue gas outlet; 3-cool air inlet; 4-cool air outlet; 5-shell; 6-hot flue gas channel; 7-cool air channel; 8-heat-conducting partition; 9-heat-conducting brick wall; 10-metal heat-conducting plate; 11-dust bin; 12-flash furnace; 13-flash heat exchange dust collector; 14-CO2 removal equipment; 15-CO2 storage equipment; 16-first dust bin; 17-second dust bin; 18-transformer; 19-rectifier; 20-gas nozzle. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0044] Example 1

[0045] like Figures 1 to 4 As shown, a sky flash heat exchange dust collector includes a shell 5 provided with a hot flue gas inlet 1, a hot flue gas outlet 2, a cool air inlet 3, and a cool air outlet 4, and a plurality of hot flue gas channels 6 and a plurality of cool air channels 7 provided in the inner cavity of the shell 5. The hot flue gas channels 6 and the cool air channels 7 can be alternately provided, and heat exchange can be performed between the hot flue gas channels 6 and the cool air channels 7. A dust bin 11 is provided at the bottom of the shell 5, a first dust bin 16 is located at the bottom of the hot flue gas channel 6 at one end of the heat conductive brick wall 9 and is connected to the hot flue gas channel 6, and a second dust bin 17 is located below the hot flue gas channel 6 at one end of the metal heat conductive plate 10 and is connected to the hot flue gas channel 6. The first dust bin 16 and the second dust bin 17 are not directly connected to each other, so as to ensure that the airflow in the heat conductive brick wall 9 area will not flow from the space of the dust bin 11 into the heat exchange space of the metal heat conductive plate 10.

[0046] The heat-conducting partition wall 8 between the hot flue gas channel 6 and the cool air channel 7 is composed of a heat-conducting brick wall 9 and a metal heat-conducting plate 10 connected in series. There are various ways of connecting in series, such as an insertion type, in which one end of the metal heat-conducting plate 10 connected to the heat-conducting brick wall 9 is inserted into the heat-conducting brick wall 9, and another example is a covering type, in which one end of the metal heat-conducting plate 10 connected to the heat-conducting brick wall 9 is covered on the wall end of the heat-conducting brick wall 9 through a channel steel structure.

[0047] The heat-conducting brick wall 9 can be constructed by using one of beryllium oxide, boron nitride, aluminum nitride, silicon nitride, and silicon carbide, which have good thermal conductivity, high temperature resistance, corrosion resistance, wear resistance, and good insulation, or by using refractory bricks made of one of the composite materials. The heat-conducting brick wall 9 can be constructed by building block refractory bricks or splicing formed plates made of composite materials, or by integrally casting refractory materials.

[0048] The metal heat conducting plate 10 has a wide range of materials to choose from. Generally, stainless steel plates, copper plates, carbon steel plates or titanium alloy plates can meet the requirements of most working conditions. Due to the easy processability of metals, the metal heat conducting plate 10 can be in a variety of shapes. The metal heat conducting plate 10 can be in a zigzag structure or a wavy structure in the gas flow direction. The heat conducting brick wall 9 can be the same or different in shape from the metal heat conducting plate 10. The heat conducting brick wall can be in a straight line structure, a zigzag structure or a wavy structure in the gas flow direction.

[0049] The length of the heat-conducting brick wall 9 section of the heat-conducting partition 8 is related to the material of the heat-conducting brick wall 9 selected. If the heat-conducting brick wall 9 is made of SiC, the length of the heat-conducting brick wall 9 section is between 10m and 60m; if the heat-conducting brick wall 9 is made of a composite ceramic material such as beryllium oxide, carbon fiber composite silicon carbide, or silicon carbide fiber composite silicon carbide, the length of the heat-conducting brick wall 9 section is within the range of 5m to 40m.

[0050] like Figure 1AB section adopts heat-conducting brick wall 9 for heat exchange, and BC section adopts metal heat-conducting plate 10 for heat exchange. The hot flue gas channel 6 at one end of the heat-conducting brick wall 9 is connected to the hot flue gas inlet 1, and the hot flue gas channel 6 at one end of the metal heat-conducting plate 10 is connected to the hot flue gas outlet 2; the cool air channel 7 at one end of the metal heat-conducting plate 10 is connected to the cool air inlet 3, and the cool air channel 7 at one end of the heat-conducting brick wall 9 is connected to the cool air outlet 4. The hot flue gas enters the hot flue gas channel 6 from the hot flue gas inlet 1, and flows along the hot flue gas channel 6 to the hot flue gas outlet 2. The cool air enters the cool air channel 7 from the cool air inlet 3, and flows along the cool air channel 7. The flow direction is opposite to that of the hot flue gas. The hot flue gas and the cool air use the heat-conducting brick wall 9 and the metal heat-conducting plate 10 as heat-conducting partitions, and continuously exchange heat. Finally, the hot flue gas is discharged from the hot flue gas outlet 2 after heat release and cooling, and the cool air is discharged from the cool air outlet 4 after heat absorption and heating. When the hot flue gas flows along the tortuous hot flue gas channel 6 , due to the continuous changes in flow velocity, direction and pressure, some large particles of smoke fall into the dust bin 11 under the action of gravity.

[0051] Example 2

[0052] like Figures 5 to 7 As shown, based on Example 1, Example 2 is different from Example 1 in that Example 2 also includes a DC power supply system, and the DC power supply system includes a transformer 18 and a rectifier 19, as shown in FIG. Figure 6 As shown, the city power (220V or 380V AC) is input from the right side, and after passing through the transformer and the rectifier circuit, it is converted into DC power, which serves as the DC power supply for the metal heat conductive plate 10 or the electric polarity conversion circuit.

[0053] The DC power supply system also includes an electrical polarity conversion circuit. After being connected to the metal heat conductive plate 10, the charged polarity of the metal heat conductive plate 10 can be periodically changed by periodically changing the polarity of the power source connected to the DC power supply system. There are many ways to change the polarity of the power source. Figure 7 As an example of an electric polarity conversion circuit, when switches K1 and K2 are connected in a prescribed manner (connected to A at the same time or connected to B at the same time), a set of power supplies with variable polarity can be obtained.

[0054] like Figure 5 As shown, the metal heat conductor 10 is connected to a DC power supply system (Group A or Group B). Through the control of the DC power supply system, the charged polarities of the metal heat conductor plates 10 on both sides of the hot flue gas channel 6 are opposite, and the charged polarities of the metal heat conductor plates 10 on both sides of the cool air channel 7 are the same.

[0055] The hot flue gas channel 6 is also provided with an air cannon type dust removal device, such as Figure 5 As shown, a gas nozzle 20 is provided in the hot flue gas passage 6 for spraying pulse gas to flush away dust on the heat-conducting brick walls 9 or metal plate heat-conducting plates 10 on both sides of the hot flue gas passage 6 .

[0056] The process of using the flash heat exchange dust collector of the present invention to treat the flue gas discharged from the flash furnace steelmaking process is as follows:

[0057] like Figure 8 As shown, the reduction smelting furnace adopts a flash furnace 12, the heat-conducting brick wall of the flash heat exchange dust collector 13 adopts carbon bricks (carbon content ≥ 92%, mechanical strength ≥ 25MPa), and the metal heat-conducting plate adopts a carbon steel plate.

[0058] The flue gas outlet temperature of the flash furnace 12 is generally as high as 1200℃~1700℃. After entering the hot flue gas channel of the flash heat exchange dust collector 13, it first passes through the heat-conducting brick wall section, and is continuously cooled by heat exchange with the cold coal gas. When it reaches B, that is, the junction of the heat-conducting brick wall and the metal heat-conducting plate, the flue gas temperature drops to below 850℃. Then, it is continuously cooled by heat exchange and dust removal by the metal heat-conducting section. When the flue gas leaves the flash heat exchange dust collector 13, the temperature has dropped to 40℃-60℃, and it has been fully dusted. After the clean coal gas is pressurized and sent to the CO2 removal equipment 14, it is separated by the CO2 removal equipment to obtain the reducing gas mainly containing CO and H2 and the high-concentration CO2 gas. Among them, high-concentration CO2 gas can be transported to the CO2 storage device 15 for making dry ice or selling outside; the reducing gas mainly containing CO and H2 is sent to the cool air channel of the flash heat exchanger dust collector 13 as cool coal gas, and after the heat exchange temperature is raised to about 1300°C, it is sent back to the flash furnace 12 for use as reducing gas.

[0059] The temperature of the flue gas discharged from the flash furnace is as high as 1200℃, and the CO and H2 content in the flue gas is also high. If the utilization efficiency of the thermal energy and chemical energy in the flue gas is not high, the comprehensive energy consumption will be greater than that of similar steel smelting processes, which may limit the use of the flash furnace. This is a difficulty in the industrialization of the flash furnace steelmaking process. After adopting the flash heat exchange dust collector described in the present invention, the waste heat and waste energy of the flash furnace are all utilized for its own smelting, and the newly added energy consumption is almost only used for the chemical consumption of iron oxide reduction, thereby ensuring that the energy consumption of the flash furnace is much lower than that of other steel smelting equipment.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A skylight heat exchange dust collector, characterized in that: The invention comprises a shell (5) provided with a hot smoke inlet (1), a hot smoke outlet (2), a cool air inlet (3), and a cool air outlet (4), and a plurality of hot smoke channels (6) and a plurality of cool air channels (7) provided in the inner cavity of the shell (5); a heat-conducting partition wall (8) between the hot smoke channels (6) and the cool air channels (7) is composed of a heat-conducting brick wall (9) and a metal heat-conducting plate (10) connected in series; the hot smoke channel (6) at one end of the heat-conducting brick wall (9) is connected to the hot smoke inlet (1); and the heat-conducting partition wall (8) between the hot smoke channels (6) and the cool air channels (7) is composed of a heat-conducting brick wall (9) and a metal heat-conducting plate (10) connected in series; The hot flue gas channel (6) at one end of the hot plate (10) is connected to the hot flue gas outlet (2); the cool air channel (7) at one end of the metal heat conducting plate (10) is connected to the cool air inlet (3), and the cool air channel (7) at one end of the heat conducting brick wall (9) is connected to the cool air outlet (4); a dust bin (11) is provided at the bottom of the shell (5), the bottom of the hot flue gas channel (6) is connected to the dust bin (11), and the cool air channel (7) is not connected to the dust bin (11); The heat-conducting brick wall (9) and the metal heat-conducting plate (10) are connected in series in an insertion-type or a wrapping-type manner. The insertion-type manner means that one end of the metal heat-conducting plate (10) connected to the heat-conducting brick wall (9) is inserted into the heat-conducting brick wall (9); the wrapping-type manner means that one end of the metal heat-conducting plate (10) connected to the heat-conducting brick wall (9) is wrapped on the wall end of the heat-conducting brick wall (9) through a channel steel structure; The heat-conducting brick wall (9) is made of one or more materials selected from beryllium oxide, boron nitride, aluminum nitride, silicon nitride, silicon carbide, magnesium oxide or composite materials of these materials; the metal heat-conducting plate (10) is one selected from copper plate, stainless steel plate, carbon steel plate or titanium alloy plate.

2. The skylight heat exchange dust collector according to claim 1 is characterized in that: The metal heat-conducting plate (10) is one or both of a zigzag structure and a wavy structure in the direction of gas flow; the heat-conducting brick wall (9) is one or more of a straight-line structure, a zigzag structure or a wavy structure in the direction of gas flow.

3. The skylight heat exchange dust collector according to claim 1 is characterized in that: The length of the heat-conducting brick wall (9) section of the heat-conducting partition wall (8) ranges from 5m to 60m.

4. The skylight heat exchange dust collector according to claim 1 is characterized in that: The dust bins (11) are provided with two, namely a first dust bin (16) and a second dust bin (17); the first dust bin (16) is located below the hot flue gas passage (6) at one end of the heat-conducting brick wall (9); the second dust bin (17) is located below the hot flue gas passage (6) at one end of the metal heat-conducting plate (10); the first dust bin (16) and the second dust bin (17) are not connected.

5. The skylight heat exchange dust collector according to claim 1 is characterized in that: A direct current power supply system is also provided, and the direct current power supply system is connected to the metal heat conducting plate (10). Through the control of the direct current power supply system, the metal heat conducting plates (10) on both sides of the hot flue gas channel (6) are charged with opposite polarities, and the metal heat conducting plates (10) on both sides of the cool air channel (7) are charged with the same polarity.

6. The skylight heat exchange dust collector according to claim 5 is characterized in that: The direct current power supply system comprises a transformer (18) and a rectifier (19).

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