Flue gas purification device of steel rolling heating furnace
By using desulfurization injectors and turbulence mechanisms in the flue gas purification device for steel rolling heating furnaces, combined with dust collectors and tail gas adsorbers, the problems of high water consumption and high operating costs of existing devices have been solved, achieving a highly efficient flue gas purification effect.
Patent Information
- Application Number
- CN202423029670.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Existing flue gas purification devices for steel rolling heating furnaces consume large amounts of water, are difficult to treat waste liquid, have high operating costs, and have limited purification effects during the desulfurization process.
The desulfurization injector is combined with a turbulence mechanism, and the desulfurizing agent is mixed with the flue gas. Combined with a dust collector and a tail gas adsorber, the pollutants in the flue gas are treated by a baffle adsorption component, including bag filter dust collection and activated carbon adsorption.
It improved the flue gas purification effect, reduced operating costs, reduced water consumption and the difficulty of waste liquid treatment, and achieved a significant purification effect.
Smart Images
Figure CN223484858U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of steel rolling production equipment, specifically relating to a flue gas purification device for a steel rolling heating furnace. Background Technology
[0002] A steel rolling mill heating furnace is a crucial piece of equipment in a steel rolling production line. It preheats steel billets to improve their plasticity and malleability, making them easier to roll into the desired shape. Currently, most steel rolling mill heating furnaces are natural gas or blast furnace gas type. During the heating process of the steel billets, the combustion of natural gas or blast furnace gas produces a certain amount of flue gas. In addition to particulate matter, the flue gas also contains SO2 and NO. X The emissions of pollutants, including trace amounts of CO, cause some environmental damage. In existing technologies, the flue gas generated by steel rolling furnaces typically recovers heat through a waste heat recovery unit and then undergoes desulfurization and denitrification treatment using an alkaline solution scrubbing tower. Current alkaline towers are typically spray-packed towers. While this structure achieves desulfurization, the use of alkaline solutions for scrubbing requires significant water resources, produces a large amount of waste liquid, and presents challenges for subsequent wastewater treatment, resulting in high operating costs. Therefore, developing a flue gas purification device for steel rolling furnaces with a reasonable structure, low operating costs, and significant purification effect is objectively necessary. Summary of the Invention
[0003] The purpose of this utility model is to provide a flue gas purification device for a steel rolling heating furnace with reasonable structure, low operating cost, and significant purification effect.
[0004] The purpose of this utility model is achieved as follows: it includes a flue pipe, a dust collector, and an exhaust chimney. A fan is installed on the flue pipe, and a desulfurization injector is installed on the flue pipe between the flue pipe and the dust collector. A desulfurizing agent storage tank is installed at the top of the desulfurization injector and connected to it. An air compressor is installed at the bottom of the desulfurizing agent storage tank and connected to it. A turbulence-inducing mechanism is installed inside the desulfurization injector. A tail gas absorber is installed on the flue pipe between the dust collector and the exhaust chimney. Two flow dividers are symmetrically and vertically installed inside the tail gas absorber. A partition plate is horizontally installed in the middle between the two flow dividers. A baffle adsorption component is installed in the tail gas absorber on the upper and lower sides of the partition plate, and flow divider holes are symmetrically arranged on the flow dividers on both sides of the partition plate.
[0005] Compared with existing technologies, the advantages of this device are as follows: First, this device uses a desulfurization injector instead of a desulfurization spray tower to desulfurize flue gas. The flue gas in the exhaust pipe, transported by a fan, mixes with the desulfurizing agent injected into the desulfurizer storage tank. During this mixing process, the desulfurizing agent reacts with the SO2 in the flue gas, achieving desulfurization. Furthermore, the turbulence-inducing mechanism disturbs the flue gas and desulfurizing agent, creating vortices that ensure thorough contact and mixing, thereby improving the adsorption effect of the desulfurizing agent on SO2 removal from the flue gas and ultimately enhancing the desulfurization efficiency. The device offers several advantages: firstly, it achieves high purification efficiency and reduces operating costs; secondly, the dust collector removes dust from the flue gas produced by the desulfurization reaction, filtering out pollutants such as desulfurizing agents and dust. Simultaneously, the baffled adsorption components within the tail gas adsorber adsorber adsorb NOx and CO. The curved flow of the flue gas within these components increases its travel distance and reaction time within the adsorber adsorber, facilitating better adsorption and purification by the baffled adsorption components and thus improving the overall purification effect. This device boasts advantages such as reasonable structure, low operating costs, and significant purification effect, making it easy to promote and use. Attached Figure Description
[0006] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0007] Figure 2 This is a schematic diagram of the desulfurization injector 5 in this utility model;
[0008] Figure 3 This is a schematic diagram of the tail gas adsorber 8 in this utility model;
[0009] In the diagram: 1-exhaust pipe, 2-dust collector, 3-emission chimney, 4-fan, 5-desulfurization injector, 51-contraction section, 52-horizontal section, 53-bend section, 54-inclined section, 55-first rotating rod, 56-second rotating rod, 57-drive motor, 58-turbulence blade, 59-drive gear, 510-driven gear, 6-desulfurizing agent storage tank, 7-air compressor, 8-tail gas adsorber, 81-diverter plate, 82-baffle plate, 83-diverter orifice, 84-baffle plate, 85-adsorption box, 86-adsorption filler, 9-one-way valve, 10-butterfly valve, 11-silencer, 12-pressure gauge. Detailed Implementation
[0010] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.
[0011] like Figures 1 to 3 As shown, this utility model includes a flue pipe 1, a dust collector 2, and an exhaust chimney 3. A fan 4 is installed on the flue pipe 1. A desulfurization injector 5 is installed on the flue pipe 1 between the flue pipe 1 and the dust collector 2. A desulfurizing agent storage tank 6 is installed at the top of the desulfurizing agent storage tank 5 and is connected to it. An air compressor 7 is installed at the bottom of the desulfurizing agent storage tank 6 and is connected to it. A turbulence mechanism is installed inside the desulfurization injector 5. A tail gas absorber 8 is installed on the flue pipe 1 between the dust collector 2 and the exhaust chimney 3. Two flow dividers 81 are symmetrically and vertically installed inside the tail gas absorber 8. A partition plate 82 is horizontally installed in the middle between the two flow dividers 81. A baffle adsorption component is installed in the tail gas absorber 8 on the upper and lower sides of the partition plate 82. A flow divider hole 83 is symmetrically arranged on the flow dividers 81 on both sides of the partition plate 82.
[0012] The working process of this device is as follows: Before use, the desulfurizing agent is added to the desulfurizing agent storage tank 6. After the flue gas generated by the steel rolling heating furnace is recovered by the waste heat recovery device, the fan 4 and air compressor 7 are started. Under the action of the fan 4, the flue gas enters the desulfurization injector 5 through the flue pipe. The air compressor 7 delivers compressed air to the desulfurizing agent storage tank 6, causing the desulfurizing agent to be agitated in the tank. Under the action of the compressed air, the desulfurizing agent in the storage tank 6 is injected into the desulfurization injector 5 to mix with the flue gas. During the process of contact and mixing between the flue gas and the desulfurizing agent, the desulfurizing agent can react with SO2 in the flue gas to achieve the purpose of desulfurization. During the mixing process, the fan 4 transports the flue gas towards the dust collector 2. The set turbulence mechanism can disturb the flue gas and desulfurizing agent, forming a vortex, allowing the flue gas and desulfurizing agent to fully contact and mix, thereby improving the adsorption efficiency of the desulfurizing agent in removing SO2 from the flue gas. This improves the purification effect of flue gas and reduces operating costs. When the flue gas enters the dust collector 2, which uses a bag filter as an existing technology, the dust collector 2 can remove dust from the flue gas of the desulfurization reaction, filtering out pollutants such as desulfurizing agents and dust in the flue gas. The flue gas discharged from the dust collector 2 then enters the tail gas adsorber 8 and enters the corresponding baffle adsorption component through the diversion hole 83 at one end. The baffle adsorption component can adsorb NOx and CO in the flue gas. The flue gas flows in a curved shape in the baffle adsorption component, which increases the travel distance of the flue gas in the tail gas adsorber 8 and increases the reaction time of the flue gas in the tail gas adsorber 8. This facilitates better adsorption and purification of the flue gas by the baffle adsorption component, which is conducive to improving the purification effect of the flue gas. The flue gas after being adsorbed and purified by the baffle adsorption component flows out through the diversion hole 83 at the other end and is finally discharged directly into the air through the exhaust chimney 3.
[0013] Furthermore, the desulfurization injector adopts the structure of the Venturi mixer used in this technology. The desulfurization injector 5 includes a contraction section 51, a horizontal section 52, a bend section 53, and an inclined section 54 arranged in sequence. The end of the contraction section 51 is provided with a sealing plate. The end of the flue gas pipe 1 passes through the sealing plate and is located inside the contraction section 51. The turbulence mechanism passes through the bend section 53 and is located inside the horizontal section 52. This structure of the desulfurization injector can achieve full mixing of flue gas and desulfurizing agent.
[0014] Furthermore, the turbulence-inducing mechanism includes a first rotating rod 55, a second rotating rod 56, and a drive motor 57. The drive motor 57 is a structure used in the prior art, and a finished product can be directly purchased according to the power required. The first rotating rod 55 and the second rotating rod 56 are rotatably mounted parallel to each other inside the desulfurization injector 5. Multiple turbulence-inducing blades 58 are respectively installed on the first rotating rod 55 and the second rotating rod 56 located inside the desulfurization injector 5. A drive gear 59 is installed on the first rotating rod 55 located outside the desulfurization injector 5, and a driven gear 510 is installed on the second rotating rod 56 located outside the desulfurization injector 5. The drive gear 59 and the driven gear 510 mesh with each other. The drive motor 57 is installed at the end of the first rotating rod 55 outside the drive gear 59. In use, the drive motor 57 is turned on, and the drive motor 57 drives the drive gear 59 and the first rotating rod 55 to rotate. During the rotation of the first rotating rod 55, the driven gear 510 drives the first rotating rod 55 and the second rotating rod 56 to rotate. During the rotation of the first rotating rod 55 and the second rotating rod 56, due to the meshing of the driving gear 59 and the driven gear 510, the first rotating rod 55 and the second rotating rod 56 can rotate in opposite directions, thereby driving the turbulence blades 58 to rotate. The turbulence blades 58 on the first rotating rod 55 and the second rotating rod 58 rotate in opposite directions and are spaced apart, thereby avoiding the formation of eddies between the flue gas and the desulfurizing agent in the desulfurizing agent, improving the mixing effect of the flue gas and the desulfurizing agent. Through the disturbance of the flow of flue gas and desulfurizing agent by the turbulence blades 58, the flue gas and the desulfurizing agent can be fully contacted and mixed, thereby improving the adsorption effect of the desulfurizing agent on SO2 in the flue gas. Preferably, in order to achieve a better turbulence effect, the turbulence blades 58 on the first rotating rod 55 and the second rotating rod 56 are arranged alternately.
[0015] Furthermore, the baffle adsorption assembly includes multiple baffle plates 84 arranged in a staggered manner. One to three sets of slide rails are symmetrically arranged between adjacent baffle plates 84. An adsorption box 85 with an open top is slidably mounted on each set of slide rails. The bottom of the adsorption box 85 has multiple ventilation holes. Adsorption filler 86, made of activated carbon, is placed inside the adsorption box 85. A split-type sealing window is provided on the outer wall of the tail gas adsorber 8 corresponding to the adsorption box 85. The sealing window is a structure used in the prior art and is not shown in the diagram; it is mainly for facilitating the opening of the adsorption box 85 from the tail gas. The gas is removed from the gas adsorber 8 for easy replacement of the adsorption filler 86. After the flue gas is separated by the partition plate 82, two airflows flow in the baffle adsorption assembly. After the flue gas enters the baffle adsorption assembly, due to the staggered arrangement of the baffle plates 84, the flue gas will flow in a curved shape between the baffle plates 84. During the flow, it can enter the adsorption box 85 through the vent hole. The adsorption filler 86 can then adsorb and purify NOx and CO in the flue gas. To facilitate the pulling out of the adsorption box 85, a handle is provided on the adsorption box 85 near the sealing window.
[0016] Furthermore, to ensure the safe transport of flue gas, the blower 4 is a Roots blower. A one-way valve 9 and a butterfly valve 10 are sequentially installed on the exhaust pipe 1 between the Roots blower 4 and the desulfurization injector 5. A silencer 11 is installed on the exhaust pipe 1 between the blower 4 and the one-way valve 9. A pressure gauge 12 is installed on the exhaust pipe 1 between the one-way valve 9 and the butterfly valve 10. The one-way valve 9 can prevent flue gas backflow, the silencer 11 has a noise reduction function, and the pressure gauge 12 can detect the injection pressure inside the desulfurization injector 5.
Claims
1. A flue gas purification device for a steel rolling heating furnace, comprising a flue pipe (1), a dust collector (2), and an exhaust chimney (3), characterized in that: A fan (4) is installed on the flue pipe (1). A desulfurization injector (5) is installed on the flue pipe (1) between the flue pipe (1) and the dust collector (2). A desulfurizing agent storage tank (6) is installed on the top of the desulfurization injector (5) and is connected to it. An air compressor (7) is installed on the bottom of the desulfurizing agent storage tank (6) and is connected to it. A turbulence mechanism is installed inside the desulfurization injector (5). A tail gas adsorber (8) is installed on the flue pipe (1) between the dust collector (2) and the exhaust chimney (3). Two flow dividers (81) are symmetrically and vertically installed inside the tail gas adsorber (8). A partition plate (82) is horizontally installed in the middle between the two flow dividers (81). A baffle adsorption component is installed in the tail gas adsorber (8) on the upper and lower sides of the partition plate (82). A flow divider hole (83) is symmetrically arranged on the flow dividers (81) on both sides of the partition plate (82).
2. The flue gas purification device for a steel rolling heating furnace according to claim 1, characterized in that: The desulfurization injector (5) includes a contraction section (51), a horizontal section (52), a bend section (53), and an inclined section (54) arranged in sequence. The end of the contraction section (51) is provided with a sealing plate. The end of the flue pipe (1) passes through the sealing plate and is located in the contraction section (51). The turbulence mechanism passes through the bend section (53) and is located in the horizontal section (52).
3. The flue gas purification device for a steel rolling heating furnace according to claim 1, characterized in that: The turbulence-disrupting mechanism includes a first rotating rod (55), a second rotating rod (56), and a drive motor (57). The first rotating rod (55) and the second rotating rod (56) are rotatably mounted in parallel inside the desulfurization injector (5). Multiple turbulence-disrupting blades (58) are respectively installed on the first rotating rod (55) and the second rotating rod (56) located inside the desulfurization injector (5). A drive gear (59) is installed on the first rotating rod (55) located outside the desulfurization injector (5), and a driven gear (510) is installed on the second rotating rod (56) located outside the desulfurization injector (5). The drive gear (59) and the driven gear (510) mesh with each other. The drive motor (57) is installed at the end of the first rotating rod (55) outside the drive gear (59).
4. The flue gas purification device for a steel rolling heating furnace according to claim 3, characterized in that: The turbulence blades (58) on the first rotating rod (55) and the second rotating rod (56) are arranged alternately.
5. The flue gas purification device for a steel rolling heating furnace according to claim 1, characterized in that: The baffle adsorption assembly includes multiple baffle plates (84) arranged vertically and horizontally. One to three sets of slide rails are symmetrically arranged between two adjacent baffle plates (84). An adsorption box (85) with an open top is slidably installed on each set of slide rails. Multiple air vents are provided at the bottom of the adsorption box (85). Adsorption filler (86) is placed inside the adsorption box (85). A double-opening sealed window is provided on the outer wall of the tail gas adsorber (8) corresponding to the adsorption box (85).
6. The flue gas purification device for a steel rolling heating furnace according to claim 5, characterized in that: A handle is provided on the adsorption box (85) near the sealing window.
7. The flue gas purification device for a steel rolling heating furnace according to claim 1, characterized in that: The blower (4) is a Roots blower, and a one-way valve (9) and a butterfly valve (10) are sequentially installed on the flue pipe (1) between the Roots blower (4) and the desulfurization injector (5).
8. The flue gas purification device for a steel rolling heating furnace according to claim 1, characterized in that: A silencer (11) is installed on the exhaust pipe (1) between the fan (4) and the one-way valve (9), and a pressure gauge (12) is installed on the exhaust pipe (1) between the one-way valve (9) and the butterfly valve (10).