Flue gas emission desulfurization device for hot-blast stove
By using multiple spraying and liquid layer mixing absorption technology in the hot blast furnace flue gas desulfurization device, the problem of insufficient spray range and contact time of the absorption liquid in the existing desulfurization tower is solved, efficient flue gas desulfurization is achieved, and emissions are ensured. .
Patent Information
- Application Number
- CN202421223555.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In the flue gas desulfurization treatment, the spray range of the absorbed liquid is limited, and the contact time between the absorbed liquid and the flue gas is short, resulting in low desulfurization efficiency and excessive flue gas sulfide emissions.
Design a hot air furnace flue gas emissions desulfurization device, which uses multiple spray binding liquid layers to mix or bubble absorption. Through fresh absorption liquid, one absorption solution, and circulating absorbing solution with different concentration The contact time and contact area of flue gas.
The absorption capacity of the desulfurization tower is improved, the flue gas treatment efficiency is enhanced, the desulfurization efficiency is greater than 90%, and the emission concentration of SO2 and dust in the flue gas meets environmental protection standards.
Smart Images
Figure CN222384538U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue gas desulfurization, in particular to a hot blast furnace flue gas emission desulfurization device. Background Art
[0002] In the field of smelting, various furnaces are usually needed, and hot blast furnace is one of them. The main function of hot blast furnace is to continuously provide high-temperature hot air for blast furnace. At present, most enterprises still use coal as fuel for hot blast furnaces, and the tail gas generated by coal combustion, that is, the flue gas discharged by hot blast furnaces, contains sulfur dioxide, hydrogen sulfide and other substances. If it is directly discharged into the air, it will pollute the air and cannot meet the increasingly stringent environmental protection requirements. Therefore, it is necessary to purify and remove sulfur dioxide and other sulfides in the tail gas generated by hot blast furnaces.
[0003] The desulfurization tower is a commonly used flue gas desulfurization device, which is often used in places such as coal-fired power plants and industrial boilers that emit a large amount of sulfides. The function of the desulfurization tower is to remove sulfur dioxide, hydrogen sulfide, etc. in the flue gas through chemical or physical methods, reduce the emission of atmospheric pollutants, and protect the environment and human health. At present, most desulfurization towers mainly use wet desulfurization, but the internal structure of the existing desulfurization tower has room for improvement. For example, the spray range of the absorption liquid spray mechanism is limited, and the contact time between the absorption liquid (usually an alkaline solution, more often an alkaline slurry) and the flue gas is short, which easily leads to the sulfides in some flue gases not being fully absorbed and reacting, which easily reduces the desulfurization efficiency of the desulfurization tower and causes the emission of flue gas sulfides to exceed the standard.
[0004] Therefore, the utility model proposes a hot blast furnace flue gas emission desulfurization device to solve the above problems. Utility Model Content
[0005] The utility model provides a hot blast furnace flue gas emission desulfurization device, which is used to solve the problems raised in the above background technology, and efficiently desulfurizes the hot blast furnace flue gas, and ensures that the flue gas discharged can meet the emission standards.
[0006] Specifically, the utility model provides a hot blast furnace flue gas emission desulfurization device, comprising: a desulfurization tower, an exhaust port is opened at the center of the top of the desulfurization tower, the exhaust port is connected to the induced draft fan through a flue gas duct, and the other side of the induced draft fan is connected to the exhaust chimney; the desulfurization tower is provided with a first liquid collecting plate and a second liquid collecting plate from top to bottom, and is divided into an upper chamber, a middle chamber and a lower chamber from top to bottom; a first spray pipeline is provided above the upper chamber, and the first spray pipeline is connected to the fresh pulp chamber through a fresh pulp pump; a liquid collecting port is provided on the side wall of the desulfurization tower above the first liquid collecting plate, and the liquid collecting port is connected to the inlet of the intermediate chamber; ventilation holes are evenly distributed on the first liquid collecting plate; a second spray pipeline is provided below the first liquid collecting plate, and the second spray pipeline It is connected to the lower chamber through a circulation pump, and a third spray pipeline for centripetal spraying is also provided between the first liquid collecting plate and the second spray pipeline. The third spray pipeline is connected to the intermediate chamber outlet through the intermediate pump, and the intermediate pump outlet is also connected to the circulation pump outlet; a flue gas inlet is provided on the side wall of the desulfurization tower above the second liquid collecting plate, and is connected to an air intake pipe; openings are evenly distributed on the second liquid collecting plate, and the openings are connected to guide pipes extending downward, and the bottom end of the guide pipe extends below the slurry liquid level in the lower chamber; an opening connected to the inlet of the circulation pump is provided on the side wall of the desulfurization tower below the slurry liquid level in the lower chamber, and an opening connected to the inlet of the thick slurry pump is also provided on the side wall of the desulfurization tower opposite to the opening, and the thick slurry pump leads to the thick slurry pool.
[0007] Preferably, the first spray pipeline is a spiral coil type spray, and the second spray pipeline is a straight pipe type spray; the first spray pipeline and the second spray pipeline are both provided with a plurality of nozzles.
[0008] Preferably, the third spray pipeline includes two hollow plates which are staggered up and down and relatively installed on the inner wall of the desulfurization tower, each hollow plate is connected to the outlet of the intermediate pump through a pipeline; and opposite flat nozzles are provided on opposite sides of the two hollow plates.
[0009] Preferably, the first liquid collecting plate is installed at an angle, and the inclined lower end is arranged on a side close to the liquid collecting port.
[0010] Preferably, the second liquid collecting plate is an inverted cone structure.
[0011] Preferably, the flue gas inlet is connected to an air supply pipe extending to the center of the desulfurization tower, and the opening at the end of the air supply pipe is bent downward.
[0012] Preferably, the bottom of the lower chamber of the desulfurization tower is inclined, and the inclined lower end is arranged on a side close to the thick slurry pump.
[0013] Preferably, an air duct is provided through each vent hole on the first liquid collecting plate, and a plurality of air ducts extend downward and through the second liquid collecting plate. The bottom ends of the plurality of air ducts are arranged above the slurry liquid level in the lower chamber, the top ends of the plurality of air ducts are higher than the liquid layer on the first liquid collecting plate, and a drainage hood is provided above the top outlet of each air duct.
[0014] Preferably, a demister is further provided between the first spray pipeline and the exhaust port.
[0015] The utility model provides a hot blast furnace flue gas emission desulfurization device, which desulfurizes the sulfur-containing tail gas of the hot blast furnace, and the desulfurization efficiency is greater than 90%, so that the SO2 emission concentration in the flue gas is less than 40mg / m 3 , dust emission concentration <10mg / m 3 , ensuring that the exhaust gas meets the emission standards, meets environmental protection emission requirements, and achieves clean production.
[0016] The device enhances the absorption effect of the absorption liquid, improves the absorption capacity of the desulfurization tower, increases the contact time and contact area between the sulfur-containing flue gas and the absorption liquid, and increases the spray coverage range, thereby improving the flue gas treatment efficiency.
[0017] The device realizes cross-centripetal spraying through the third spray pipeline, which, combined with the spraying in the vertical direction, increases the spraying range and improves the efficiency and effect of spray absorption. The air duct prolongs the residence time and flow route of the flue gas in the desulfurization tower, increases the contact area between the absorption liquid and the flue gas, thereby improving the desulfurization efficiency, strengthening the desulfurization purification effect, and greatly increasing the operating flexibility of the desulfurization device. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 A schematic diagram of the external structure of a hot blast furnace flue gas emission desulfurization device provided in one embodiment of the utility model;
[0020] Figure 2 A schematic diagram of the internal structure of a desulfurization tower provided in one embodiment of the utility model;
[0021] Figure 3 This is a schematic diagram of the internal cross-sectional structure of a desulfurization tower provided in another embodiment of the utility model.
[0022] Description of reference numerals:
[0023] 1-desulfurization tower, 2-induced draft fan, 3-exhaust chimney, 11-exhaust port, 12-first liquid collecting plate, 13-second liquid collecting plate, 14-upper chamber, 15-middle chamber, 16-lower chamber, 141-first spray pipeline, 142-fresh pulp pump, 143-fresh pulp warehouse, 144-liquid collecting port, 145-intermediate warehouse, 146-induction pipe, 147-drainage hood, 148-demister, 151-second spray pipeline, 152-circulation pump, 153-third spray pipeline, 154-intermediate pump, 155-intake pipe, 156-hollow plate, 157-air delivery pipe, 158-flue gas inlet, 161-guide pipe, 162-thick pulp pump, 163-thick pulp pool. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the utility model.
[0025] like Figure 1 and Figure 2The utility model provides a hot blast furnace flue gas emission desulfurization device, comprising: a desulfurization tower 1, an exhaust port 11 is opened at the center of the top of the desulfurization tower 1, the exhaust port 11 is connected to the induced draft fan 2 through a flue gas duct, and the other side of the induced draft fan 2 is connected to the exhaust chimney 3; the desulfurization tower 1 is provided with a first liquid collecting plate 12 and a second liquid collecting plate 13 from top to bottom, and is divided into an upper chamber 14, a middle chamber 15 and a lower chamber 16 from top to bottom; a first spray pipeline 141 is provided above the upper chamber 14, and the first spray pipeline 141 is connected to the fresh pulp warehouse 143 through a fresh pulp pump 142; a liquid collecting port 144 is provided on the side wall of the desulfurization tower 1 above the first liquid collecting plate 12, and the liquid collecting port 144 is connected to the entrance of the intermediate warehouse 145; ventilation holes are evenly distributed on the first liquid collecting plate 12; a second spray pipeline 151 is provided below the first liquid collecting plate 12, and the second spray pipeline 151 is connected to the entrance of the intermediate warehouse 145 through a circulating pump 152 is connected to the lower chamber 16, and a third spray pipeline 153 for centripetal spraying is also provided between the first liquid collecting plate 12 and the second spray pipeline 151, and the third spray pipeline 153 is connected to the outlet of the intermediate chamber 145 through the intermediate pump 154, and the outlet of the intermediate pump 154 is also connected to the outlet of the circulation pump 152; a flue gas inlet 158 is provided on the side wall of the desulfurization tower 1 above the second liquid collecting plate 13, and is connected to an air intake pipe 155; openings are evenly distributed on the second liquid collecting plate 13, and the openings are connected to a guide pipe 161 extending downward, and the bottom end of the guide pipe 161 extends below the slurry liquid level in the lower chamber 16; an opening connected to the inlet of the circulation pump 152 is provided on the side wall of the desulfurization tower 1 located below the slurry liquid level in the lower chamber 16, and an opening connected to the inlet of the thick slurry pump 162 is also provided on the side wall of the desulfurization tower 1 opposite to the opening, and the thick slurry pump 162 leads to the thick slurry pool 163.
[0026] The sulfur-containing flue gas enters the middle chamber 15 of the desulfurization tower 1 from the air inlet pipe 155, and is sprayed for the first time by the circulating absorption liquid sprayed from the second spray pipeline 151 and the primary absorption liquid sprayed from the third spray pipeline 153. During this period, the absorption liquid absorbs the sulfide and dust particles in the flue gas, and the secondary absorption liquid falls on the second liquid collecting plate 13. After being guided by the guide pipe 161, it enters the slurry in the lower chamber 16 and disturbs the slurry, promoting the slurry to be mixed evenly for recycling. The slurry accumulates in the lower chamber 16 and is sent to the second spray pipeline 151 through the circulation pump 152. After accumulating until the sulfur content reaches the limit value, the slurry with a higher concentration is sent to the thick slurry pool 163 through the thick slurry pump 162, which is convenient for the subsequent production of gypsum and the like. The slurry liquid level in the lower chamber 16 can be set according to the actual production conditions such as the operating load and flue gas flow of the desulfurization tower 1, and is not limited here.
[0027] After the flue gas is sprayed for the first time, it flows upward through the vents of the first liquid collecting plate 12. The fresh slurry pump 142 sends the fresh absorption liquid from the fresh slurry bin 143 to the first spray pipeline 141 for spraying. The flue gas that has been purified once is sprayed and purified for the second time with the fresh absorption liquid in the upper chamber 14. The formed primary absorption liquid is concentrated and sent to the intermediate bin 145 through the liquid collecting port 144. The liquid layer formed by the primary absorption liquid on the first liquid collecting plate 12 should not be too thick to prevent the liquid layer from hindering the flue gas from escaping through the vents. The flue gas is also mixed and absorbed when passing through the liquid layer, which is beneficial to improving the purification and desulfurization effect. The primary absorption liquid in the intermediate bin 145 is mainly supplied to the third spray pipeline 153, but when the concentration of the circulating absorption liquid needs to be adjusted or the concentrated slurry pump 162 pumps more slurry, the circulating pump 152 can be used for slurry replenishment.
[0028] The flue gas purified by two sprayings is discharged from the desulfurization tower 1 through the exhaust port 11 at the top of the desulfurization tower 1, and is sent to the induced draft fan 2 through the flue gas duct, and is guided to the exhaust chimney 3 by the induced draft fan 2 for discharge. The desulfurization efficiency is greater than 90%, ensuring that the flue gas discharged meets the emission standards. Through the cooperation of fresh absorption liquid, primary absorption liquid and circulating absorption liquid with different concentrations, the primary absorption liquid is supplemented through the third spray pipeline 153 during the slurry recycling process in the lower chamber 16. Compared with the method of only recycling the slurry in the lower chamber 16 in the prior art, the two absorption liquids cooperate with each other for spraying, which enhances the absorption effect of the absorption liquid, makes the use effect of the effective components in the spray liquid more stable, improves the absorption capacity of the desulfurization tower 1, and is conducive to improving the desulfurization efficiency. In addition, the multiple spraying purification combined with the liquid layer mixed absorption method increases the contact time and contact area between the sulfur-containing flue gas and the absorption liquid, and the spraying coverage is also wider, with good desulfurization effect and high desulfurization efficiency.
[0029] Preferably, the first spray pipeline 141 is a spiral coil spray, and the second spray pipeline 151 is a straight pipe spray; a plurality of nozzles are provided on the first spray pipeline 141 and the second spray pipeline 151. Fresh absorption liquid and circulating absorption liquid can be sprayed out through the nozzles, so that the flue gas rising in the inner cavity of the desulfurization tower 1 can be desulfurized and absorbed. Through different forms of spray pipelines, wet spraying at different positions can be satisfied, thereby increasing the efficiency and effect of spray absorption.
[0030] like Figure 1 and Figure 2Preferably, the third spray pipeline 153 includes two hollow plates 156 staggered up and down and relatively installed on the inner wall of the desulfurization tower 1, each hollow plate 156 is connected to the outlet of the intermediate pump 154 through a pipeline; the opposite sides of the two hollow plates 156 are provided with relative flat nozzles. The intermediate pump 154 sends the primary absorption liquid collected from the upper chamber 14 to the hollow plate 156, and then sprays it to the center of the desulfurization tower 1 through the flat nozzle. Different from the spraying in the vertical direction of the first spray pipeline 141 and the second spray pipeline 151, the staggered hollow plates 156 and the flat nozzle realize cross-centripetal spraying, and can form a continuous waterfall-like spraying, which increases the spraying range and can improve the efficiency and effect of spraying absorption. The shape of the hollow plate 156 is not limited. Preferably, one side has the same curvature as the inner wall of the desulfurization tower 1, and the other side is a linear semi-arc structure. The arc portion is convenient for installation in conjunction with the inner wall of the desulfurization tower 1, and the straight portion is convenient for installation of the flat nozzle without affecting its centripetal spraying direction.
[0031] like Figure 2 Preferably, the first liquid collecting plate 12 is installed at an angle, and the lower end of the angle is arranged on a side close to the liquid collecting port 144. The inclined first liquid collecting plate 12 allows the falling primary absorption liquid to be more quickly concentrated at the position of the liquid collecting port 144, accelerating its speed of leaving the desulfurization tower 1, while also avoiding the problem of excessive liquid layer accumulating on the first liquid collecting plate 12, which prevents the flue gas from smoothly entering the upper chamber 14 from the vent hole.
[0032] like Figure 2 Preferably, the second liquid collecting plate 13 is an inverted cone structure. After the sprayed circulating absorption liquid and the primary absorption liquid absorb the sulfide, they will form substances that are easier to precipitate, such as calcium sulfide and calcium sulfite. The inverted cone-shaped second liquid collecting plate 13 can increase the fluidity of the falling secondary absorption liquid and prevent it from being deposited on the second liquid collecting plate 13. At the same time, the falling secondary absorption liquid is concentrated in a relatively middle position and then sent to the lower chamber 16 through the guide pipe 161, which can reduce the disturbance of the slurry at the inlet of the circulation pump 152 and the concentrated slurry pump 162, and ensure the operating stability of the circulation pump 152 and the concentrated slurry pump 162.
[0033] like Figure 3 Preferably, the flue gas inlet 158 is connected to an air delivery pipe 157 extending to the center of the desulfurization tower 1, and the end opening of the air delivery pipe 157 is bent downward. The air delivery pipe 157 delivers the external flue gas to the center of the desulfurization tower 1, so that the flue gas diffuses from the center to the surroundings, and the diffusion and distribution of the flue gas inside the desulfurization tower 1 are more uniform, ensuring that the absorption reaction in the desulfurization tower 1 is sufficient and uniform, which is beneficial to the spray purification operation of the second spray pipeline 151 and the third spray pipeline 153, and improves the desulfurization absorption effect.
[0034] like Figure 2Preferably, the bottom of the lower chamber 16 of the desulfurization tower 1 is inclined, and the inclined lower end is arranged on the side close to the concentrated slurry pump 162. The inclined bottom of the lower chamber 16 facilitates the slurry to settle to the inclined lower end, and is promptly sent out of the desulfurization tower 1 by the concentrated slurry pump 162, so that the concentration of the circulating absorption liquid pumped by the circulating pump 152 at the inclined high end is relatively low, thereby improving the slurry recycling effect and the effectiveness of absorbing sulfides.
[0035] like Figure 3 Preferably, an air duct 146 is provided through each vent hole on the first liquid collecting plate 12, and a plurality of air ducts 146 extend downward and penetrate the second liquid collecting plate 13. The bottom ends of the plurality of air ducts 146 are arranged above the slurry liquid level in the lower chamber 16, and the top ends of the plurality of air ducts 146 are higher than the liquid layer on the first liquid collecting plate 12, and a drainage hood 147 is provided above the top outlet of each air duct 146.
[0036] The structure of the duct 147 can be conical, truncated or other commonly used structures, which are not specifically limited here. After the air duct 146 is set, the flue gas entering the desulfurization tower 1 from the air intake pipe 155 needs to enter the slurry in the lower chamber 16 through the guide pipe 161 for bubbling absorption after the first spraying of the middle chamber 15, and the flue gas overflowing from the slurry is transported to the upper chamber 14 through the air duct 146, and then purified by the second spraying. Compared with the flow route of the flue gas entering the upper chamber 14 after being sprayed in the middle chamber 15, the residence time and flow route of the flue gas in the desulfurization tower 1 are extended through the air duct 146, and the flue gas is not only absorbed by spraying, but also absorbed by bubbling, which increases the contact area between the absorption liquid and the flue gas, thereby improving the desulfurization efficiency and enhancing the desulfurization purification effect. At the same time, the air duct 146 can also facilitate the desulfurization tower 1 to adjust the spray load of the spray pipeline, and also facilitate the desulfurization tower 1 to adjust the air intake load, thereby greatly increasing the operating flexibility of the desulfurization device.
[0037] like Figure 3 Preferably, a demister 148 is further provided between the first spray pipeline 141 and the exhaust port 11. The demister 148 can capture the mist particles, slurry droplets, etc. entrained in the flue gas after desulfurization purification to be discharged, so as to prevent them from polluting and corroding the flue gas pipeline and subsequent equipment. The demister 148 is a common device in the art, and its structure is not specifically limited here, and its corresponding clean water flushing mechanism can also be selected according to production conditions.
[0038] The present invention is further described in detail below in conjunction with specific embodiments.
[0039] Example 1
[0040] The hot blast furnace flue gas emission desulfurization device, when working, the sulfur-containing flue gas enters the middle chamber 15 of the desulfurization tower 1 through the flue gas inlet 158 from the air intake pipe 155, and is sprayed for the first time by the circulating absorption liquid sprayed by the nozzle on the second spray pipeline 151 and the primary absorption liquid sprayed by the nozzle on the third spray pipeline 153. The second spray pipeline 151 is a straight pipe spray, and the third spray pipeline 153 is a centripetal spray. Among them, the intermediate pump 154 sends the primary absorption liquid collected from the upper chamber 14 to the hollow plate 156 of the third spray pipeline 153, and then sprays it to the center of the desulfurization tower 1 through the flat nozzle, forming a continuous waterfall spray, which increases the spray range.
[0041] During the spraying, the absorption liquid absorbs the sulfide and dust particles in the flue gas, and the secondary absorption liquid falls on the second liquid collecting plate 13 of the inverted cone structure. After being guided by the guide pipe 161, it enters the slurry in the lower chamber 16 and disturbs the slurry to promote uniform mixing of the slurry. The slurry accumulates in the lower chamber 16 and is sent to the second spray pipeline 151 through the circulation pump 152. After the slurry in the lower chamber 16 with an inclined bottom is accumulated to the sulfur content reaching the limit value, the slurry with a higher concentration is sent to the thick slurry pool 163 through the thick slurry pump 162 to facilitate the subsequent production of gypsum and the like.
[0042] After the flue gas is sprayed for the first time, it flows upward through the vent holes of the first liquid collecting plate 12. The fresh slurry pump 142 sends the fresh absorption liquid from the fresh slurry bin 143 to the nozzle on the first spray pipeline 141 for spraying. The first spray pipeline 141 is a spiral coil spray. The flue gas that has been purified once is sprayed and purified for the second time with the fresh absorption liquid in the upper chamber 14. The formed primary absorption liquid is concentrated on the inclined first liquid collecting plate 12, and then sent to the intermediate bin 145 through the liquid collecting port 144. The primary absorption liquid forms a liquid layer on the first liquid collecting plate 12. When the flue gas passes through the liquid layer, it is also mixed and absorbed, which is beneficial to improve the purification and desulfurization effect. The primary absorption liquid in the intermediate bin 145 is mainly supplied to the third spray pipeline 153, but when the concentration of the circulating absorption liquid needs to be adjusted or the concentrated slurry pump 162 pumps more slurry, the circulating pump 152 can be used for slurry replenishment.
[0043] The flue gas purified by two sprayings is captured by the demister 148, discharged from the desulfurization tower 1 through the exhaust port 11 at the top of the desulfurization tower 1, and sent to the induced draft fan 2 through the flue gas duct, and guided to the exhaust chimney 3 for discharge through the induced draft fan 2. The desulfurization efficiency is greater than 90%, ensuring that the exhaust flue gas meets the emission standards.
[0044] Example 2
[0045] On the basis of the above embodiment, this embodiment also includes: external flue gas is sent to the center of the desulfurization tower 1 through the air supply pipe 157 connected to the flue gas inlet 158, so that the flue gas diffuses from the center to the surroundings, and the diffusion and distribution of the flue gas inside the desulfurization tower 1 are more uniform, which is beneficial to the spray purification operation of the second spray pipeline 151 and the third spray pipeline 153.
[0046] An air duct 146 connected to the lower chamber 16 is provided through each air vent on the first liquid collecting plate 12. Compared with the flow route in which the flue gas enters the upper chamber 14 after being sprayed in the middle chamber 15, after the air duct 146 is provided, the flue gas entering the desulfurization tower 1 from the air inlet pipe 155 needs to enter the slurry in the lower chamber 16 through the guide pipe 161 for bubbling absorption after the first spraying of the middle chamber 15. The flue gas overflowing from the slurry is transported to the upper chamber 14 through the air duct 146, and after being dispersed through the drainage hood 147, it is purified by the second spraying of the first spray pipeline 141, which prolongs the residence time and flow route of the flue gas in the desulfurization tower 1, improves the desulfurization efficiency, and greatly increases the operating flexibility of the desulfurization device.
[0047] It should be noted that in the present invention, the detailed structure of some devices is not described in detail, but belongs to the prior art known to those skilled in the art, so it will not be repeated here. In addition, the parts not involved in the device are the same as the prior art or can be implemented by the prior art.
[0048] It should be noted that those skilled in the art can make some modifications to the above device under the guidance of the utility model. For example, the equipment in the device is also equipped with a liquid level gauge, overflow / nitrogen pipeline, etc.; pressure sensors, flow meters or temperature sensors are installed between different units and equipment on the delivery pipeline inside the device, and different valves are also installed, such as pressure relief valves, pressure regulating valves, safety valves, pneumatic valves, etc., which are used to adjust and stabilize the pressure of the entire device, and the opening of the valve can also be adjusted to adjust the material flow in the pipeline.
[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A hot blast furnace flue gas emission desulfurization device, characterized in that: include: A desulfurization tower, wherein an exhaust port is provided at the center of the top of the desulfurization tower, the exhaust port is connected to an induced draft fan through a flue gas duct, and the other side of the induced draft fan is connected to an exhaust chimney; The desulfurization tower is provided with a first liquid collecting plate and a second liquid collecting plate in sequence from top to bottom, and is divided into an upper chamber, a middle chamber and a lower chamber from top to bottom; a first spray pipeline is provided above the upper chamber, and the first spray pipeline is connected to the fresh pulp bin through a fresh pulp pump; a liquid collecting port is provided on the side wall of the desulfurization tower above the first liquid collecting plate, and the liquid collecting port is connected to the entrance of the intermediate bin; ventilation holes are evenly distributed on the first liquid collecting plate; a second spray pipeline is provided below the first liquid collecting plate, and the second spray pipeline is connected to the lower chamber through a circulating pump, and a third spray pipeline for centripetal spraying is also provided between the first liquid collecting plate and the second spray pipeline. The third spray pipeline is connected to the intermediate bin outlet through an intermediate pump, and the intermediate pump outlet is also connected to the circulation pump outlet; a flue gas inlet is provided on the side wall of the desulfurization tower above the second liquid collecting plate, and is connected to an air intake pipe; openings are evenly distributed on the second liquid collecting plate, and the openings are connected to a guide pipe extending downward, and the bottom end of the guide pipe extends below the slurry liquid level in the lower chamber; an opening connected to the circulation pump inlet is provided on the side wall of the desulfurization tower below the slurry liquid level in the lower chamber, and an opening connected to the inlet of a thick slurry pump is also provided on the side wall of the desulfurization tower opposite to the opening, and the thick slurry pump leads to a thick slurry pool.
2. The hot blast stove flue gas emission desulfurization device according to claim 1, characterized in that: The first spray pipeline is a spiral coil type spray, and the second spray pipeline is a straight pipe type spray; a plurality of nozzles are arranged on the first spray pipeline and the second spray pipeline.
3. The hot blast stove flue gas emission desulfurization device according to claim 1, characterized in that: The third spray pipeline includes two hollow plates which are staggered up and down and relatively installed on the inner wall of the desulfurization tower, each of which is connected to the outlet of the intermediate pump through a pipeline; and relative flat nozzles are provided on the opposite sides of the two hollow plates.
4. The hot blast stove flue gas emission desulfurization device according to claim 1, characterized in that: The first liquid collecting plate is installed in an inclined manner, and the inclined lower end is arranged on a side close to the liquid collecting port.
5. The hot blast stove flue gas emission desulfurization device according to claim 1, characterized in that: The second liquid collecting plate is an inverted cone structure.
6. The hot blast stove flue gas emission desulfurization device according to claim 1, characterized in that: The flue gas inlet is connected to an air supply pipe extending to the center of the desulfurization tower, and the end opening of the air supply pipe is bent downward.
7. The hot blast stove flue gas emission desulfurization device according to claim 1, characterized in that: The bottom of the lower chamber of the desulfurization tower is inclined, and the inclined lower end is arranged on a side close to the thick slurry pump.
8. The hot blast stove flue gas emission desulfurization device according to any one of claims 1 to 7, characterized in that: An air duct is provided through each of the air holes on the first liquid collecting plate, and a plurality of the air ducts extend downward and penetrate the second liquid collecting plate. The bottom ends of the plurality of air ducts are arranged above the slurry liquid level in the lower chamber, and the top ends of the plurality of air ducts are higher than the liquid layer on the first liquid collecting plate, and a drainage hood is provided above the top outlet of each air duct.
9. The hot blast stove flue gas emission desulfurization device according to claim 8, characterized in that: A demister is also provided between the first spray pipeline and the exhaust port.