A pollution reduction device for a steel plant

Abstract

The present invention relates to the field of metal smelting technology, and specifically to a pollution reduction device for a steel plant, comprising a smelting furnace for smelting metal, the smelting furnace being provided with a feed hopper and a drain pipe, the drain pipe being provided with a heat recovery pipe for recovering the heat of exhaust gas; a filter assembly for treating exhaust gas, the filter assembly comprising a filter box filled with liquid and a movable plate rotatably installed in the filter box, the filter box being connected to the exhaust end of the drain pipe, and the movable plate being located above the exhaust end of the drain pipe, and an aeration hole being provided at one end of the movable plate away from the drain pipe. The present invention prevents the exhaust gas from being discharged quickly through the movable plate, increases the contact time between the gas and the liquid, and as the gas increases, the buoyancy increases to drive the movable plate to rotate, the gas overflows from multiple groups of aeration holes and is divided into multiple groups of fine bubbles, thereby increasing the contact area between the gas and the liquid, improving the reaction efficiency of the exhaust gas and the liquid, increasing the removal effect of the smoke particles, and reducing the water consumption.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting, and in particular to a pollution reduction device for a steel plant. Background Art

[0002] The production process of steel smelting is to smelt iron ore into pig iron in a blast furnace, then use the pig iron as raw material to smelt steel using different methods, and then cast it into steel ingots or continuous casting billets.

[0003] Since more polluting gases are generated during the steel smelting process, but these polluting gases carry a large amount of thermal energy, traditional steel pollution emission reduction devices can only achieve a single emission reduction function, but cannot convert and utilize waste heat. Therefore, the China Patent Network has disclosed a patent with publication number CN108285945B, which discloses a steel pollution emission reduction device. The device is started by a first pumping device, coordinated with a motor, and then the fan blades are driven to rotate through a rotating rod. The spray head sprays water mist to the polluted gas passing through to remove particulate dust. With the help of purification equipment and emission reduction net bags, most of the dust in the polluted gas can be removed and the gas can be purified. On the other hand, a large amount of heat is generated during smelting in the smelting chamber, which will heat and vaporize the water in the heating tube and enter the gas storage tank through the steam pipe. Then, the high-pressure gas in the gas storage tank drives the turbine in the turbine pressurizing device to rotate through the air pipe, and then drives the steering shaft to rotate, and then drives the rotor in the generator to rotate to generate electricity.

[0004] In the above-mentioned public documents, dust particles in the exhaust gas are removed by continuously spraying water mist through a spray head. However, this high-frequency and large-volume water mist spraying has several significant problems;

[0005] 1. The spraying volume of water mist is extremely large, which leads to a significant increase in the demand for water resources. This not only increases operating costs, but may also put certain pressure on the environment, especially in areas where water resources are relatively tight.

[0006] Second, while spraying water mist increases the humidity of the exhaust gas, it also brings additional burden to the subsequent filtering and treatment equipment. The increase in humidity may cause the performance of the filter material to decline, affecting its adsorption and filtration effects on harmful substances. Summary of the invention

[0007] In view of the above-mentioned shortcomings of the prior art, the present invention provides a pollution reduction device for a steel plant, which can effectively solve the problems in the prior art that waste gas treatment is not environmentally friendly, has a large demand for water resources, has a low efficiency in removing dust particles, and increases the burden on subsequent processing equipment.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides a pollution reduction device for a steel plant, comprising:

[0010] A smelting furnace for smelting metals, wherein the smelting furnace is provided with a feed hopper and a drain pipe, wherein a heat recovery pipe for recovering waste gas heat is installed in the drain pipe;

[0011] A filter assembly for treating exhaust gas, the filter assembly comprising a filter box filled with liquid and a movable plate rotatably installed in the filter box, the filter box is connected to the exhaust end of the sewage pipe, and the movable plate is located above the exhaust end of the sewage pipe, and an aeration hole is provided at one end of the movable plate away from the sewage pipe.

[0012] Furthermore, the filter box is provided with an exhaust pipe and a gas processing device located at the end of the exhaust pipe, and the gas processing device is used to re-process the chemical substances in the gas after being processed by the filter component.

[0013] Furthermore, the heat recovery pipe includes a spiral tube 1, a connecting pipe and a spiral tube 2 which are interconnected, and the spiral tube 1 is located in the sewage pipe, and the spiral tube 2 is located in the exhaust pipe. The exhaust pipe is provided with a liquid guide hopper, which is used to collect the condensed liquid and introduce it into the filter box. The air inlet end of the spiral tube 2 is provided with an air pump.

[0014] Furthermore, a preheating tube and a preheating ring which are interconnected are provided in the feed hopper, and an air inlet end of the preheating tube is connected to an exhaust end of the spiral tube, and a plurality of exhaust holes are provided on the preheating ring.

[0015] Furthermore, the movable plate is rotatably installed in the filter box through a hinge, and the movable plate is lower than the highest liquid level in the filter box. A gap is provided between an end of the movable plate away from the hinge and an inner wall of the filter box.

[0016] Furthermore, the movable plate is provided with a plurality of groups of aeration holes, and the plurality of groups of aeration holes occupy half of the movable plate. The width of the movable plate is consistent with the internal width of the filter box, so as to prevent the exhaust gas from overflowing from both sides of the movable plate. After the exhaust gas is discharged from the sewage pipe and enters under the movable plate, when the gas reaches a certain amount, the buoyancy drives the movable plate to rotate along the hinge, thereby introducing the gas into the aeration holes and dispersing it into a plurality of groups of small bubbles.

[0017] Furthermore, it also includes a cleaning component for cleaning the heat recovery pipe, the cleaning component includes an extrusion plate movably installed in the filter box and resting against the top of the movable plate, a movable rod movably installed on the filter box and extending into the sewage pipe, a cleaning brush is provided on one side of the movable rod located in the sewage pipe, and a pressure block 1 is provided on the top of the extrusion plate, and the pressure block 1 is used to squeeze the movable rod toward the sewage pipe when the extrusion plate rises.

[0018] Furthermore, a pressing block 2 cooperating with the pressing block 1 is provided on one side of the movable rod close to the extrusion plate, and an elastic member is sleeved on the movable rod, and two ends of the elastic member respectively abut against the filter box and the pressing block 2.

[0019] Furthermore, it also includes a guide sleeve, which is arranged on the filter box and extends into the sewage pipe, and the guide sleeve is provided with a spiral groove, and the movable rod is provided with a protrusion for cooperating with the spiral groove. When the movable rod moves toward the sewage pipe, the spiral groove rotates.

[0020] Beneficial Effects

[0021] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0022] 1. The movable plate prevents the exhaust gas from being discharged quickly, and increases the contact time between the gas and the liquid. As the gas increases, the buoyancy increases to drive the movable plate to rotate. The gas overflows from multiple groups of aeration holes and is divided into multiple groups of tiny bubbles, thereby increasing the contact area between the gas and the liquid, improving the reaction efficiency of the exhaust gas and the liquid, and increasing the removal effect of the smoke particles. There is no need to spray water mist continuously, reducing water consumption;

[0023] Second, the heat in the exhaust gas is absorbed by the spiral tube and the internal gas of the spiral tube is heated. At the same time, the metal ore to be smelted in the feed hopper is preheated with the preheating tube, and the waste heat is recycled, which is energy-saving and environmentally friendly;

[0024] 3. The movable plate is rotated to push the extrusion plate to cooperate with the pressing block 1 and the pressing block 2 to push the movable rod toward the spiral tube 1, thereby driving the cleaning brush to clean the spiral tube 1, so as to prevent excessive smoke and dust particles from accumulating on the spiral tube 1 and maintain efficient heat energy conversion of the spiral tube 1;

[0025] Fourth, a guide sleeve is arranged between the filter box and the sewage pipe. Since the guide sleeve is provided with a spiral groove and the movable rod is provided with a protrusion, the movable rod cooperates with the protrusion when moving, so that the movable rod will rotate while approaching and moving away from the spiral tube 1, thereby improving the cleaning effect of the spiral tube 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a partial cross-sectional view of the present invention;

[0029] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0030] Figure 4 It is a schematic diagram of the connection between the spiral tube 1 and the preheating tube of the present invention;

[0031] Figure 5 It is a schematic diagram of the state after the movable plate of the present invention is rotated;

[0032] Figure 6 It is a structural schematic diagram of the guide sleeve of the present invention;

[0033] Figure 7 This is a state change diagram of the movable plate of the present invention when it rotates.

[0034] Figure numerals: 1, smelting furnace; 11, feed hopper; 111, preheating tube; 112, preheating ring; 12, drain pipe; 13, heat recovery pipe; 131, spiral tube one; 132, connecting pipe; 133, spiral tube two; 2, filter assembly; 21, filter box; 22, movable plate; 221, aeration hole; 23, cleaning assembly; 231, extrusion plate; 232, pressure block one; 233, guide sleeve; 2331, spiral groove; 234, movable rod; 235, elastic member; 236, pressure block two; 237, cleaning brush. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention will be further described below in conjunction with the embodiments.

[0037] Example:

[0038] A pollution reduction device for a steel plant, see attached Figure 1-7 ,include:

[0039] A smelting furnace 1 for smelting metals, wherein the metal ore is smelted by the smelting furnace 1, a blower is arranged outside the smelting furnace 1 for adding gas into the smelting furnace 1, a feed hopper 11 and a drain pipe 12 are arranged on the smelting furnace 1, the feed hopper 11 is used to introduce ore into the smelting furnace 1, the drain pipe 12 is used to discharge the waste gas generated by the smelting of the metal ore into a treatment mechanism for treating the waste gas, and a heat recovery pipe 13 for recovering the heat of the waste gas is installed in the drain pipe 12, and the heat in the waste gas is recovered by the heat recovery pipe 13 and reused for a second time, thereby reducing the energy consumption of production;

[0040] A filter assembly 2 for treating exhaust gas, the filter assembly 2 includes a filter box 21 connected to the sewage pipe 12 and a movable plate 22 rotatably installed in the filter box 21, the filter box 21 is filled with liquid, the movable plate 22 is located in the liquid, and the movable plate 22 is still located in the liquid after rotation, the initial state of the movable plate 22 is an inclined state, and the side of the movable plate 22 provided with a hinge is lower than the other side, when the sewage pipe 12 is connected to the filter box 21, when exhaust gas is generated in the sewage pipe 12, it will pass into the filter box 21, and the particulate smoke in the exhaust gas will be removed by liquid absorption, and the gas will accumulate at the bottom of the movable plate 22 after entering the filter box 21, and the buoyancy of the movable plate 22 will gradually increase. Since the movable plate 22 is rotatably installed in the filter box 21 and located in the sewage pipe 12 through the hinge, the movable plate 22 will be located in the liquid after rotation, and the movable plate 22 will be located in the liquid after rotation. Above the exhaust end of the sewage pipe 12, there is a gap between the end of the movable plate 22 away from the hinge and the inner wall of the filter box 21 to prevent the rotation of the movable plate 22 from being affected, and the movable plate 22 is lower than the highest liquid level in the filter box 21. When the buoyancy increases to a certain level, the movable plate 22 flips over to release the gas, which increases the reaction time between the gas and the liquid in the filter box 21 and improves the removal effect of particulate smoke. On the other hand, a plurality of aeration holes 221 are provided at the end of the movable plate 22 away from the hinge. When the sewage pipe 12 is exhausted and enters the bottom of the movable plate 22, when the gas reaches a certain amount and is driven by the buoyancy to rotate the movable plate 22, the gas is introduced into the aeration holes 221 and dispersed into a plurality of small bubbles, which again increases the contact area between the gas and the liquid, thereby further improving the removal effect of particulates and smoke.

[0041] Among them, the filter box 21 is provided with an exhaust pipe and a gas treatment device located at the end of the exhaust pipe. The gas treatment is used to treat the chemical substances in the gas. The chemical substances in the gas are removed by the gas treatment device, and the exhaust gas is discharged into the atmosphere after reaching the standard. The heat recovery pipe 13 includes a spiral pipe 131, a connecting pipe 132 and a spiral pipe 133 which are interconnected. The spiral pipe 131 is located in the sewage pipe 12, and the spiral pipe 133 is located in the exhaust pipe. The connecting pipe 132 is used to pass the gas in the spiral pipe 133 into the spiral pipe 131. The spiral pipe 133 continuously passes the gas into the spiral pipe 131, thereby continuously absorbing the heat in the exhaust gas. Due to the treatment of the filter box 21, the heat recovery pipe 131 is used to pass the gas in the spiral pipe 133 into the spiral pipe 131. The gas after treatment still contains heat and some water vapor, and the spiral tube 133 is used to condense the treated gas, thereby removing part of the moisture in the gas and reducing the processing burden of the gas processing equipment. At the same time, since the exhaust pipe is provided with a liquid guide bucket, the liquid guide bucket is used to collect the condensed liquid and introduce it into the filter box 21 for recycling. The air inlet end of the spiral tube 133 is provided with an air pump for introducing the gas into the spiral tube 133. The air pump will limit the flow rate in the spiral tube 133 to prevent the dust in the ore from being blown up when the ore is preheated. The air inlet end of the air pump can also be connected to the exhaust end of the gas processing equipment to form a gas circulation. At the same time, the gas flow rate entering the spiral tube 133 must also be controlled.

[0042] In addition, a preheating pipe 111 and a preheating ring 112 are provided in the feed hopper 11, and the air inlet end of the preheating pipe 111 is connected to the exhaust end of the spiral tube 131. A plurality of exhaust holes are provided on the preheating ring 112. After the gas in the spiral tube 131 absorbs heat, it is discharged into the preheating pipe 111 and cooperates with the preheating ring 112 to introduce the hot gas into the feed hopper 11, so as to preheat the metal ore to be smelted in the feed hopper 11, thereby reducing the heat energy consumption of the metal ore when smelting in the smelting furnace 1.

[0043] In addition, it also includes a cleaning component 23 for cleaning the heat recovery pipe 13. The cleaning component 23 is used to regularly clean the spiral tube 131 to prevent smoke particles from accumulating on the outer wall of the spiral tube 131, which leads to a decrease in heat conversion efficiency. The cleaning component 23 includes an extrusion plate 231 movably installed in the filter box 21 and against the top of the movable plate 22. When the movable plate 22 rotates, the extrusion plate 231 is driven to rise. Since the movable rod 234 is movably installed on the filter box 21 and extends into the sewage pipe 12, a cleaning brush 237 is provided on one side of the movable rod 234 located in the sewage pipe 12. The cleaning brush 237 is a high-temperature resistant steel brush. A pressing block 232 is provided on the top of the extrusion plate 231. A pressing block 236 cooperating with the pressing block 1 232 is provided on one side of the movable rod 234 close to the extrusion plate 231. When the extrusion plate 231 rises, the movable rod 234 is driven to move toward the smelting furnace 1, thereby driving the cleaning brush 237 to perform local cleaning on the spiral tube 131 to keep the outer wall of the spiral tube 131 clean, while ensuring that the spiral tube 131 can perform efficient heat energy transfer. An elastic member 235 is sleeved on the movable rod 234, and the two ends of the elastic member 235 respectively abut against the filter box 21 and the pressing block 236. The elastic member 235 is used to push the pressing block 236 to reset after the movable plate 22 is reset, thereby pulling the cleaning brush 237 again to clean the spiral tube 131.

[0044] It is worth mentioning that it also includes a guide sleeve 233, which is arranged on the filter box 21 and extends into the sewage pipe 12, and a spiral groove 2331 is provided on the guide sleeve 233, and a protrusion for cooperating with the spiral groove 2331 is provided on the movable rod 234. When the movable rod 234 moves toward and away from the sewage pipe 12, the spiral groove 2331 rotates, thereby improving the cleaning effect of the cleaning brush 237 on the spiral tube 131.

[0045] Working principle: The smelting furnace 1 smelts the metal ore, and then discharges the waste gas into the drain pipe 12 and enters the filter box 21. When the waste gas passes through the spiral tube 131, it conducts heat and heats the gas in the spiral tube 131. The heated gas enters the feed hopper 11 through the preheating tube 111 and the preheating ring 112, and then preheats the metal ore to be smelted. Since the exhaust end of the drain pipe 12 is lower than the movable plate 22, the gas will first accumulate under the movable plate 22 after entering the filter box 21, increasing the As the contact time between gas and liquid increases, gas gathers on the side of the movable plate 22 away from the hinge, and part of the gas overflows from the aeration holes 221. The gas overflowing from the aeration holes 221 has a lower speed than the air intake speed of the sewage pipe 12. As more gas is introduced, the buoyancy increases to drive the movable plate 22 to rotate along the hinge. Gas overflows from multiple groups of aeration holes 221 and is divided into multiple groups of tiny bubbles, thereby increasing the contact area between gas and liquid. When the movable plate 22 rotates, it pushes the extrusion plate 231 to cooperate with the pressing block. The first 232 and the second pressing block 236 push the movable rod 234 to move toward the spiral tube 131, thereby driving the cleaning brush 237 to clean the spiral tube 131, and keeping the spiral tube 131 without excessive smoke and dust particles. After the gap is generated between the side of the movable plate 22 away from the hinge and the inner wall of the filter box 21, the gas is quickly released, so that the buoyancy of the gas cannot overcome the gravity of the movable plate 22 and the thrust of the squeezing plate 231. After the bottom gas is discharged, the movable plate 22 is reset, and the elastic member 235 drives the cleaning brush 237 to reset, and cleaning is performed again. At the same time, the movable plate 22 is reset to continue to prevent the gas from quickly overflowing; since a guide sleeve 233 is provided between the filter box 21 and the sewage pipe 12, and a spiral groove 2331 is provided on the guide sleeve 233, the movable rod 234 cooperates with the protrusion when moving, so that the movable rod 234 will rotate while approaching and moving away from the spiral tube 131, thereby improving the cleaning effect of the spiral tube 131 and maintaining the efficient heat energy conversion of the spiral tube 131.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pollution reduction device for a steel plant, characterized in that: include: A smelting furnace (1) for smelting metal, wherein the smelting furnace (1) is provided with a feed hopper (11) and a sewage discharge pipe (12); A filter assembly (2) for treating exhaust gas, the filter assembly (2) comprising a filter box (21) filled with liquid and a movable plate (22) rotatably mounted in the filter box (21), the filter box (21) being provided with an exhaust pipe, the filter box (21) being connected to the exhaust end of a sewage pipe (12), the movable plate (22) being located above the exhaust end of the sewage pipe (12), an aeration hole (221) being provided at one end of the movable plate (22) away from the sewage pipe (12), the movable plate (22) being rotatably mounted in the filter box (21) by means of a hinge, and the movable plate (22) being lower than the liquid in the filter box (21). a maximum liquid level of the body, a gap is provided between the end of the movable plate (22) away from the hinge and the inner wall of the filter box (21), a plurality of groups of aeration holes (221) are provided on the movable plate (22), and the plurality of groups of aeration holes (221) occupy half of the movable plate (22), the width of the movable plate (22) is consistent with the internal width of the filter box (21), so as to prevent the exhaust gas from overflowing from both sides of the movable plate (22), and after the exhaust gas from the sewage pipe (12) enters the bottom of the movable plate (22), when the gas reaches a certain amount, the buoyancy drives the movable plate (22) to rotate along the hinge, thereby introducing the gas into the aeration holes (221) and dispersing it into a plurality of groups of small bubbles; A heat recovery pipe (13), the heat recovery pipe (13) comprising a spiral pipe (131), a connecting pipe (132) and a spiral pipe (133) which are interconnected, wherein the spiral pipe (131) is located in a sewage pipe (12), the spiral pipe (133) is located in an exhaust pipe, the exhaust pipe is provided with a liquid guide hopper, the liquid guide hopper is used to collect condensed liquid and guide it into a filter box (21), an air pump is provided at the air inlet end of the spiral pipe (133), a preheating pipe (111) and a preheating ring (112) which are interconnected are provided in the feed hopper (11), the air inlet end of the preheating pipe (111) is connected to the exhaust end of the spiral pipe (131), and a plurality of exhaust holes are provided on the preheating ring (112).

2. A pollution reduction device for a steel plant according to claim 1, characterized in that: The filter box (21) is provided with a gas processing device located at the end of the exhaust pipe, and the gas processing device is used to re-process the chemical substances in the gas after being processed by the filter component (2).

3. A pollution reduction device for a steel plant according to claim 1, characterized in that: It also includes a cleaning assembly (23) for cleaning the heat recovery pipe (13), the cleaning assembly (23) comprising a squeezing plate (231) movably mounted in the filter box (21) and resting against the top of the movable plate (22), a movable rod (234) movably mounted on the filter box (21) and extending into the sewage pipe (12), a cleaning brush (237) being provided on one side of the movable rod (234) located in the sewage pipe (12), and a pressing block 1 (232) being provided on the top of the squeezing plate (231), the pressing block 1 (232) being used to press the movable rod (234) to move toward the sewage pipe (12) when the squeezing plate (231) rises.

4. A pollution reduction device for a steel plant according to claim 3, characterized in that: A second pressing block (236) cooperating with the first pressing block (232) is provided on one side of the movable rod (234) close to the extrusion plate (231), and an elastic member (235) is sleeved on the movable rod (234), with two ends of the elastic member (235) respectively abutting against the filter box (21) and the second pressing block (236).

5. A pollution reduction device for a steel plant according to claim 4, characterized in that: It also includes a guide sleeve (233), the guide sleeve (233) being arranged on the filter box (21) and extending into the sewage pipe (12), the guide sleeve (233) being provided with a spiral groove (2331), the movable rod (234) being provided with a protrusion for cooperating with the spiral groove (2331), and when the movable rod (234) moves toward the sewage pipe (12), the spiral groove (2331) is rotated.

Images