Desulfurization device for steel rolling production

Abstract

The utility model discloses a desulfurization device for steel rolling production, which comprises a dust removal box, a waste gas inlet pipe is arranged below one side of the dust removal box, an adsorption box is arranged above the dust removal box, and an exhaust pipe is mounted in the middle of the upper end of the adsorption box; the sealing plate is arranged at the upper part in the dust removal box, a plurality of filter cartridges are arranged at the lower end of the sealing plate in a rectangular array, and mounting rings at the upper ends of the filter cartridges are hermetically connected with the sealing plate; the conveying pipe is arranged on one side above the sealing plate and extends to the outside of the dust removal box, a first three-way valve is installed on the lower portion of the outside of the conveying pipe, a negative pressure pump is installed above the first three-way valve, an air distribution pipe is installed above the negative pressure pump, a second three-way valve is installed at the upper end of the outside of an exhaust pipe, and a second three-way valve is installed at the lower end of the outside of the exhaust pipe. And a circulating pipe is mounted between the second three-way valve and the first three-way valve, so that the problem that the desulfurization effect of the desulfurization device is gradually reduced along with long-time use is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment in steel rolling production, in particular to a desulfurization device used in steel rolling production. Background Art

[0002] During the steel rolling process, waste gas containing sulfur oxides is produced due to raw materials and process reasons. Excessive sulfur content in steel will affect the mechanical properties and corrosion resistance of the steel, so desulfurization is a key step in improving steel quality. The main function of the desulfurization device is to remove sulfur oxides from the waste gas through chemical reactions or physical adsorption to meet environmental standards and improve product quality. Chemical reaction desulfurization is to remove sulfur by spraying a desulfurizer into a furnace containing sulfides. The desulfurizer reacts with the sulfides to form oxides, thereby removing sulfur. Physical adsorption desulfurization is to adsorb sulfides onto the surface of the adsorbent.

[0003] For example, the Chinese authorized patent with announcement number CN201384917Y, "A flue gas desulfurization device for a steel rolling heating furnace", includes a first oxidation blower for extracting flue gas from the exhaust flue of the heating furnace, a hydrogen sulfide absorption unit, a second oxidation blower for extracting flue gas from the hydrogen sulfide absorption unit, a sulfur oxide absorption unit, and a third oxidation blower for extracting flue gas from the lime slurry unit. The first oxidation blower is connected to the exhaust flue of the heating furnace and the hydrogen sulfide absorption unit, the second oxidation blower is connected to the hydrogen sulfide absorption unit and the lime slurry unit, and the third oxidation blower is connected to the lime slurry unit.

[0004] Although the above-mentioned existing technology can achieve desulfurization of sulfides in exhaust gas, the desulfurization effect tends to gradually decrease with long-term use, so that the exhausted exhaust gas cannot meet the emission requirements, and therefore does not meet the existing needs. In this regard, we propose a desulfurization device for steel rolling production. Utility Model Content

[0005] The purpose of the utility model is to provide a desulfurization device for steel rolling production to solve the problem in the above background technology that the desulfurization effect of the desulfurization device gradually decreases with long-term use.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a desulfurization device for steel rolling production, comprising a dust removal box, an exhaust gas inlet pipe being provided below one side of the dust removal box, an adsorption box being provided above the dust removal box, and an exhaust pipe being installed at the middle position of the upper end of the adsorption box; and further comprising:

[0007] A sealing plate is arranged above the interior of the dust removal box, wherein a plurality of filter cartridges are provided in a rectangular array at the lower end of the sealing plate, and a mounting ring at the upper end of the filter cartridge is sealed to the sealing plate;

[0008] A delivery pipe is arranged on one side above the sealing plate and extends to the outside of the dust removal box. A first three-way valve is installed below the outside of the delivery pipe, a negative pressure pump is installed above the first three-way valve, an air distribution pipe is installed above the negative pressure pump, a second three-way valve is installed at the upper end of the outside of the exhaust pipe, and a circulation pipe is installed between the second three-way valve and the first three-way valve.

[0009] Preferably, an adsorption tank is provided at the bottom of the inner cavity of the adsorption box, an aeration pipe is installed inside the adsorption tank, and one end of the aeration pipe is connected to the air distribution pipe.

[0010] Preferably, a baffle is installed at the middle position of the inner cavity of the adsorption box, and there are at least three baffles, which are staggered. Spray pipes are installed between adjacent baffles for spraying alkaline absorbent.

[0011] Preferably, a pull-out box is installed at the upper end of the inner cavity of the adsorption box, and the pull-out box is slidably connected to the adsorption box. An adsorption composite layer is provided inside the pull-out box, and the adsorption composite layer includes a support net, and there are two support nets. An activated carbon layer, a zeolite layer, an iron sulfide layer and an iron oxide layer are provided between the two support nets from bottom to top.

[0012] Preferably, a sulfide detection sensor is installed at the lower end of the exhaust pipe, the output end of the sulfide detection sensor is connected to a processor, and the output end of the processor is connected to the input ends of the first three-way valve and the second three-way valve.

[0013] Preferably, an air bag is provided above the dust removal box, and a pulse valve is installed at one end of the air bag, a blow pipe is provided at one end of the pulse valve, and the blow pipe extends to the top of the inner cavity of the dust removal box, and a nozzle is provided at the bottom of the blow pipe, and the nozzle is located above the filter cartridge.

[0014] Preferably, the baffle has an inclined structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The utility model is provided with a dust removal box. Under the action of a negative pressure pump, the waste gas generated in the steel rolling production process is transported from the waste gas inlet pipe to the inside of the dust removal box. When passing through the filter cartridge, the particulate impurities on the surface can be blocked on the outside of the filter cartridge, thereby reducing the particulate matter content in the waste gas and reducing the burden of subsequent desulfurization treatment. The waste gas that has been filtered by the particulate matter can enter the top of the sealing plate from the filter cartridge and is convenient for entering the adsorption box. In order to avoid blockage caused by a large number of particulates attached to the surface of the filter cartridge, the pulse valve at one end of the air bag can be opened regularly, and high-pressure air can be sprayed toward the inside of the filter cartridge through the spray pipe, so that the dust attached to the outer wall of the filter cartridge can be quickly separated, ensuring the long-term stability of the filtering performance of the filter cartridge.

[0017] 2. The utility model adopts a combination of chemical and physical adsorption methods to desulfurize the exhaust gas. Under the action of a negative pressure pump, the exhaust gas is transported to the air distribution pipe and then enters the adsorption liquid at the bottom of the adsorption box through the aeration pipe. Since the air pressure in the adsorption liquid is relatively high, countless bubbles are formed in the adsorption liquid. These bubbles can maximize the contact effect with the adsorption liquid, thereby achieving pre-desulphurization of the exhaust gas. Then the exhaust gas moves upward, and by turning on the pump of the spray pipe, the alkaline absorbent is transported from the liquid storage tank to the spray pipe, and then the nozzle below is sprayed on the exhaust gas passing through, reacting with the sulfur oxides in the exhaust gas to generate sulfates or sulfites. At the same time, baffles are provided above and below the spray pipe, which can make the exhaust gas move in an S shape, thereby improving the reaction effect with the alkaline absorbent. Finally, the gas that has undergone chemical adsorption enters the adsorption composite layer. When passing through the activated carbon layer, zeolite layer, iron sulfide layer and iron oxide layer, it can further adsorb the residual sulfide in the gas to ensure the desulfurization effect of the gas.

[0018] 3. The utility model installs a sulfide detection sensor on one side of the exhaust pipe. When the adsorbed gas is discharged from the exhaust pipe, the sulfide detection sensor can detect the sulfide in the gas. When the detection value is normal, the dust removal box, the adsorption box and the exhaust pipe are connected through the first three-way valve and the second three-way valve. If the sulfide in the gas detection value exceeds the set value, the first three-way valve and the second three-way valve are used to close the entry of the exhaust gas from the delivery pipe, and the lower end of the circulation pipe is connected to the air distribution pipe, and the air outlet of the exhaust pipe is connected to the upper end of the circulation pipe. At this time, under the action of the negative pressure pump, the gas can enter the adsorption box again for desulfurization treatment until it meets the emission standards. This structure can cope with the problem of gradually decreasing desulfurization effect as the desulfurization device is used for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0021] Figure 3 This is a top view of the sealing plate of the present invention;

[0022] Figure 4 For the utility model Figure 2 A partial enlarged view of area A in the middle.

[0023] In the figure: 1. Dust removal box; 2. Adsorption box; 3. Pull-out box; 4. Exhaust gas inlet pipe; 5. Delivery pipe; 6. Air distribution pipe; 7. Aeration pipe; 8. Negative pressure pump; 9. First three-way valve; 10. Circulation pipe; 11. Exhaust pipe; 12. Second three-way valve; 13. Sulfide detection sensor; 14. Sealing plate; 15. Filter cartridge; 16. Blowing pipe; 17. Air bag; 18. Baffle; 19. Spray pipe; 20. Adsorption composite layer; 21. Support net; 22. Activated carbon layer; 23. Zeolite layer; 24. Iron sulfide layer; 25. Iron oxide layer. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] See also Figure 1-4 The present invention provides an embodiment of a desulfurization device for steel rolling production, comprising a dust removal box 1, an exhaust gas inlet pipe 4 being provided below one side of the dust removal box 1, an adsorption box 2 being provided above the dust removal box 1, and an exhaust pipe 11 being installed at the middle position of the upper end of the adsorption box 2; and further comprising:

[0026] A sealing plate 14 is provided above the interior of the dust removal box 1. A plurality of filter cartridges 15 are provided in a rectangular array at the lower end of the sealing plate 14. The mounting rings at the upper ends of the filter cartridges 15 are sealed to the sealing plate 14.

[0027] The delivery pipe 5 is arranged on one side above the sealing plate 14, and the delivery pipe 5 extends to the outside of the dust removal box 1. A first three-way valve 9 is installed below the outside of the delivery pipe 5, a negative pressure pump 8 is installed above the first three-way valve 9, and an air distribution pipe 6 is installed above the negative pressure pump 8. A second three-way valve 12 is installed at the upper end of the outside of the exhaust pipe 11, and a circulation pipe 10 is installed between the second three-way valve 12 and the first three-way valve 9.

[0028] During use, when the adsorbed gas is discharged from the exhaust pipe 11, the sulfide detection sensor 13 can detect the sulfide in the gas. When the detection value is normal, the dust removal box 1, the adsorption box 2 and the exhaust pipe 11 are formed into a passage through the first three-way valve 9 and the second three-way valve 12. If the sulfide in the gas detection value exceeds the set value, the first three-way valve 9 and the second three-way valve 12 are used to close the entry of the exhaust gas from the delivery pipe 5, and the lower end of the circulation pipe 10 is connected to the gas distribution pipe 6, and the air outlet of the exhaust pipe 11 is connected to the upper end of the circulation pipe 10. At this time, under the action of the negative pressure pump 8, the gas can enter the adsorption box again for desulfurization treatment until the emission standards are met.

[0029] See also Figure 2An adsorption tank is provided at the bottom of the inner cavity of the adsorption box 2, and an aeration pipe 7 is installed inside the adsorption tank, and one end of the aeration pipe 7 is connected to the air distribution pipe 6. Since the air pressure entering the adsorption liquid is relatively high, countless bubbles are formed in the adsorption liquid. These bubbles can maximize the contact effect with the adsorption liquid.

[0030] See also Figure 2 A baffle 18 is installed in the middle position of the inner cavity of the adsorption box 2. There are at least three baffles 18, and the baffles 18 are staggered. A spray pipe 19 is installed between adjacent baffles 18 for spraying alkaline absorbent. The alkaline absorbent is sodium hydroxide, which reacts with sulfur oxides in the exhaust gas to generate sulfate or sulfite.

[0031] See also Figure 1 、 Figure 2 and Figure 4 A pull-out box 3 is installed at the upper end of the inner cavity of the adsorption box 2, and the pull-out box 3 is slidably connected to the adsorption box 2. An adsorption composite layer 20 is provided inside the pull-out box 3. The adsorption composite layer 20 includes a support net 21, and there are two support nets 21. An activated carbon layer 22, a zeolite layer 23, an iron sulfide layer 24 and an iron oxide layer 25 are sequentially arranged between the two support nets 21 from bottom to top, which can further adsorb residual sulfides in the gas and ensure the desulfurization effect of the gas.

[0032] See also Figure 2 A sulfide detection sensor 13 is installed at the lower end of the outside of the exhaust pipe 11. The output end of the sulfide detection sensor 13 is connected to a processor, and the output end of the processor is connected to the input ends of the first three-way valve 9 and the second three-way valve 12. This structure can cope with the problem of gradually decreasing desulfurization effect as the desulfurization device is used for a long time.

[0033] See also Figure 2 An air bag 17 is provided above the dust removal box 1, and a pulse valve is installed at one end of the air bag 17. A blow pipe 16 is provided at one end of the pulse valve, and the blow pipe 16 extends to the top of the inner cavity of the dust removal box 1. A nozzle is provided at the bottom of the blow pipe 16, and the nozzle is located above the filter cartridge 15, so that the dust attached to the outer wall of the filter cartridge 15 can be quickly separated, ensuring the long-term stability of the filtering performance of the filter cartridge 15.

[0034] See also Figure 2 , the baffle 18 has an inclined structure.

[0035] Working principle: When in use, under the action of the negative pressure pump 8, the waste gas generated in the steel rolling production process is transported from the waste gas inlet pipe 4 to the inside of the dust removal box 1. When passing through the filter cartridge 15, the surface particulate impurities can be blocked on the outside of the filter cartridge 15, thereby reducing the particulate matter content in the waste gas and reducing the burden of subsequent desulfurization treatment. The waste gas that has been filtered by the particulate matter can enter the top of the sealing plate 14 from the filter cartridge 15, and is convenient for entering the adsorption box 2. It enters the adsorption liquid at the bottom of the adsorption box 2 through the aeration pipe 7. Since the air pressure entering the adsorption liquid is relatively high, countless bubbles are formed in the adsorption liquid. These bubbles can maximize the contact effect with the adsorption liquid, thereby achieving The waste gas is pre-desulphurized, and then moves upward. By turning on the pump of the spray pipe 19, the alkaline absorbent is transported from the liquid storage tank to the spray pipe 19, and then the passing waste gas is sprayed by the nozzle below to react with the sulfur oxides in the waste gas to generate sulfates or sulfites. At the same time, baffles 18 are provided above and below the spray pipe 19. The baffles 18 can make the waste gas move in an S shape, thereby improving the reaction effect with the alkaline absorbent. Finally, the chemically adsorbed gas enters the adsorption composite layer 20, and when passing through the activated carbon layer 22, the zeolite layer 23, the iron sulfide layer 24 and the iron oxide layer 25, the residual sulfide in the gas can be further adsorbed.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A desulfurization device for steel rolling production, comprising a dust removal box (1), an exhaust gas inlet pipe (4) being provided below one side of the dust removal box (1), an adsorption box (2) being provided above the dust removal box (1), and an exhaust pipe (11) being installed at a middle position of the upper end of the adsorption box (2); Its characteristics are: Also includes: A sealing plate (14) is arranged above the interior of the dust removal box (1), and a plurality of filter cartridges (15) are provided on the lower end of the sealing plate (14) in a rectangular array, and a mounting ring on the upper end of the filter cartridge (15) is sealed and connected to the sealing plate (14); A delivery pipe (5) is arranged on one side above the sealing plate (14), and the delivery pipe (5) extends to the outside of the dust removal box (1); a first three-way valve (9) is installed below the outside of the delivery pipe (5); a negative pressure pump (8) is installed above the first three-way valve (9); an air distribution pipe (6) is installed above the negative pressure pump (8); a second three-way valve (12) is installed at the upper end of the outside of the exhaust pipe (11), and a circulation pipe (10) is installed between the second three-way valve (12) and the first three-way valve (9).

2. A desulfurization device for steel rolling production according to claim 1, characterized in that: An adsorption tank is provided at the bottom of the inner cavity of the adsorption box (2), an aeration pipe (7) is installed inside the adsorption tank, and one end of the aeration pipe (7) is connected to the air distribution pipe (6).

3. The desulfurization device for steel rolling production according to claim 1, characterized in that: A baffle (18) is installed at the middle position of the inner cavity of the adsorption box (2), at least three baffles (18) are provided, and the baffles (18) are staggered. Spray pipes (19) are installed between adjacent baffles (18) for spraying alkaline absorbent.

4. The desulfurization device for steel rolling production according to claim 1, characterized in that: A pull-out box (3) is installed at the upper end of the inner cavity of the adsorption box (2), and the pull-out box (3) is slidably connected to the adsorption box (2). An adsorption composite layer (20) is provided inside the pull-out box (3), and the adsorption composite layer (20) includes a support net (21), and two support nets (21) are provided. An activated carbon layer (22), a zeolite layer (23), an iron sulfide layer (24) and an iron oxide layer (25) are provided between the two support nets (21) from bottom to top.

5. The desulfurization device for steel rolling production according to claim 1, characterized in that: A sulfide detection sensor (13) is installed at the lower end of the exhaust pipe (11), and the output end of the sulfide detection sensor (13) is connected to a processor, and the output end of the processor is connected to the input ends of the first three-way valve (9) and the second three-way valve (12).

6. The desulfurization device for steel rolling production according to claim 1, characterized in that: An air bag (17) is provided above the dust removal box (1), and a pulse valve is installed at one end of the air bag (17), a blow pipe (16) is provided at one end of the pulse valve, and the blow pipe (16) extends to the top of the inner cavity of the dust removal box (1), and a nozzle is provided at the bottom of the blow pipe (16), and the nozzle is located above the filter cartridge (15).

7. The desulfurization device for steel rolling production according to claim 3, characterized in that: The baffle (18) has an inclined structure.

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