Resistance control device for coke oven gas desulfurization tower by using complex iron method

Abstract

The utility model relates to a coke oven gas complexing iron method desulfurization tower resistance control device which comprises a desulfurization tower, an intermediate tank, a settling separator, a rich liquid pump, a regeneration tower, a foam tank, a foam pump, a plate-and-frame filter press, a sulfur melting kettle, a filtrate tank and a filtrate pump, an upper liquid inlet of the desulfurizing tower is connected with a desulfurizing barren liquor conveying pipeline, a lower gas inlet of the desulfurizing tower is connected with a coke oven gas conveying pipeline, a top gas outlet of the desulfurizing tower is connected with a purified gas conveying pipeline, and a bottom liquid outlet of the desulfurizing tower is connected with an inlet of the intermediate tank. Control valves are arranged on the two branch pipes, one branch pipe is connected with an inlet of the rich liquid pump, the other branch pipe is connected with an inlet of the settling separator, and a liquid outlet of the settling separator is connected with the inlet of the rich liquid pump through a liquid outlet pipe with a liquid outlet valve. The device disclosed by the utility model can effectively settle and filter out sulfur in the desulfurized pregnant solution, and is more practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of desulfurization, and in particular relates to a coke oven gas complex iron method desulfurization tower resistance control device. Background Art

[0002] At present, when the chelated iron method is used to desulfurize coke oven gas, a chelated iron desulfurization lean liquid mainly containing trivalent iron ions is usually introduced from the top of the desulfurization tower, so that the chelated iron desulfurization lean liquid flows from top to bottom and reacts in countercurrent with the coke oven gas entering from the bottom of the desulfurization tower and flowing from bottom to top. The desulfurization lean liquid has extremely strong oxidizing properties and can effectively absorb and remove H2S and some organic sulfur from the gas. The desulfurized gas is discharged from the top of the desulfurization tower to the subsequent process, and the desulfurization lean liquid that has absorbed H2S becomes a desulfurization rich liquid mainly containing divalent iron ions and sulfur, which is discharged from the bottom of the desulfurization tower to the intermediate tank and then pumped to the regeneration tower by a rich liquid pump. By blowing air into the regeneration tower, the desulfurization rich liquid is oxidized and regenerated back to the desulfurization lean liquid, and then transported back to the upper part of the desulfurization tower for recycling. At the same time, sulfur foam carrying a large amount of sulfur particles is generated and discharged from the cone of the regeneration tower into a foam tank. It is then pumped by a foam pump to a plate and frame filter press for filtration. The filtrate is collected in a filtrate tank and then returned to the regeneration tower via a filtrate pump for further regeneration. The filter cake becomes a sulfur paste and is sent to a sulfur melting kettle for sulfur melting. However, in actual application, the sulfur particles produced are very small in size and have special surface properties, which make them prone to adsorption. This makes it easy for mist to be entrained in the desulfurization lean liquid, causing the porosity of the desulfurization tower packing layer to gradually decrease. This in turn increases the pressure in the desulfurization tower and the resistance to gas rise. This has a significant adverse impact on the efficiency and quality of desulfurization and needs to be improved. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a coke oven gas complex iron method desulfurization tower resistance control device, which can effectively settle and filter out sulfur in the desulfurization rich liquid to solve the above problems.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a coke oven gas complex iron method desulfurization tower resistance control device, including a desulfurization tower, an intermediate tank, a sedimentation separator, a rich liquid pump, a regeneration tower, a foam tank, a foam pump, a plate and frame filter press, a sulfur melting kettle, a filtrate tank and a filtrate pump, the upper liquid inlet of the desulfurization tower is connected to the desulfurization lean liquid delivery pipeline, the lower air inlet is connected to the coke oven gas delivery pipeline, the top exhaust port is connected to the purified gas delivery pipeline, and the bottom liquid discharge port is connected to the inlet of the intermediate tank. Pressure gauges are installed at the upper and lower parts of the desulfurization tower, and two branches are connected in parallel to the outlet of the intermediate tank. Both branches are provided with control valves and one of the branches is connected to the inlet of the rich liquid pump and the other is connected to the inlet of the sedimentation separator. The liquid outlet of the sedimentation separator is connected through a valve with a liquid outlet. The liquid outlet pipe of the valve is connected to the inlet of the rich liquid pump, the slag outlet of the sedimentation separator is connected to the inlet of the foam pump through a slag outlet pipe with a slag valve, the outlet of the rich liquid pump is connected to the lower liquid inlet of the regeneration tower, the lower air inlet of the regeneration tower is connected to the air conveying pipeline, the top liquid outlet of the regeneration tower is connected to the upper liquid inlet of the desulfurization tower, the top foam outlet of the regeneration tower is connected to the inlet of the foam tank, the outlet of the foam tank is connected to the inlet of the foam pump, the outlet of the foam pump is connected to the inlet of the plate and frame filter press, the filter residue outlet of the plate and frame filter press is connected to the inlet of the molten sulfur kettle through a hopper, the filtrate outlet of the plate and frame filter press is connected to the inlet of the filtrate tank, the outlet of the filtrate tank is connected to the inlet of the filtrate pump, and the outlet of the filtrate pump is connected to the lower liquid inlet of the regeneration tower.

[0005] Preferably, the sedimentation separator includes a cylinder, the front side of the cylinder is open and is connected to a sealing door that can be opened and closed, a ceramic tubular filter element is detachably provided on the inner top of the cylinder, the inlet of the sedimentation separator is opened on the side of the cylinder below the ceramic tubular filter element, the liquid outlet of the sedimentation separator is opened on the top of the cylinder corresponding to the inner side of the ceramic tubular filter element, and the slag outlet of the sedimentation separator is opened on the bottom of the cylinder in an inverted cone shape.

[0006] Preferably, the bottom of the ceramic tube filter element is closed and a square mounting plate is fixedly connected to the top. Blind holes are provided on the front, back, left and right sides of the mounting plate. A square mounting groove is provided on the inner top of the cylinder. Electric push rods are built into the top of the cylinder on the front, back, left and right sides of the mounting groove. The telescopic end of the electric push rod faces and can extend into the mounting groove. The mounting plate is inserted into the mounting groove. The telescopic end of the electric push rod corresponds to the blind hole on the same side and is inserted into the corresponding blind hole. A through hole is provided on the part of the mounting plate corresponding to the liquid outlet of the sedimentation separator.

[0007] Preferably, the mounting plate is adapted to the mounting slot.

[0008] Preferably, the telescopic end of the electric push rod is adapted to the corresponding blind hole.

[0009] The beneficial effects of the present invention are as follows: during desulfurization production, the complex iron desulfurization lean liquid is transported to the upper liquid inlet of the desulfurization tower by the desulfurization lean liquid transport pipeline and sprayed downward, so that the complex iron desulfurization lean liquid flows from top to bottom, and is countercurrently contacted with the coke oven gas transported to the lower air inlet of the desulfurization tower through the coke oven gas transport pipeline and flows from bottom to top to react. The desulfurization lean liquid has extremely strong oxidizing property and can effectively absorb and remove H2S and part of organic sulfur in the gas. The desulfurized gas is discharged from the top exhaust port of the desulfurization tower and transported to the subsequent process by the purified gas transport pipeline. The desulfurization lean liquid that has absorbed H2S becomes a desulfurization rich liquid mainly containing divalent iron ions and sulfur, which is discharged from the bottom drain port of the desulfurization tower into the intermediate tank. At this time, the control valve on the branch pipe between the intermediate tank and the sedimentation separator, as well as the liquid outlet valve and slag outlet valve are all in the closed state, and the control valve on the branch pipe between the intermediate tank and the rich liquid pump is opened, so that the rich liquid pump can pump the rich liquid into the regeneration tower. Afterwards, air is blown into the regeneration tower through the air conveying pipeline to oxidize the desulfurized rich liquid and regenerate it back into the desulfurized lean liquid, and then transport it back to the upper part of the desulfurization tower for recycling. At the same time, sulfur foam carrying a large amount of sulfur particles can be generated, which is discharged from the cone of the regeneration tower into the foam tank, and then pumped by the foam pump to the plate and frame filter press for filtration. The filtrate is collected by the filtrate tank and then sent back to the regeneration tower for further regeneration via the filtrate pump. The filter cake is sulfur paste, which can be fed into the sulfur melting kettle for sulfur melting after being guided by the hopper;

[0010] During the process, the pressure in the upper and lower sections of the desulfurization tower is monitored in real time using two pressure gauges located on each side. When the pressure differential between the two reaches a certain value, the control valve on the branch pipe between the intermediate tank and the rich liquid pump is closed, and the control valve and the liquid outlet valve on the branch pipe between the intermediate tank and the sedimentation separator are opened. This allows the desulfurized rich liquid to flow through the sedimentation separator before entering the regeneration tower. The sedimentation separator effectively settles and filters out sulfur from the rich liquid. The purified rich liquid is then pumped into the regeneration tower by the rich liquid pump for regeneration. This effectively reduces sulfur foaming during regeneration and reduces entrainment of mist in the desulfurized lean liquid, thus preventing further sulfur blockage and increasing resistance to gas rise, thereby ensuring overall desulfurization efficiency and quality. Once sulfur filtered out by sedimentation accumulates to a certain level, the discharge valve is opened, and the sulfur in the sedimentation separator is pumped through the discharge pipe by the foam pump to the plate and frame filter press for filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the main structure of the sedimentation separator of the utility model;

[0013] Figure 3This is a schematic diagram of the main cross-sectional structure of the sedimentation separator of the utility model;

[0014] Figure 4 This is a schematic diagram of the main structure of the cylinder of the utility model;

[0015] Figure 5 This is a schematic diagram of the top structure of the cylinder of the utility model;

[0016] Figure 6 This is a schematic diagram of the main structure of the ceramic tubular filter element of the utility model;

[0017] Figure 7 It is a schematic diagram of the top view of the ceramic tubular filter element of the utility model.

[0018] The numbers in the figure are: 1 is a desulfurization tower, 2 is an intermediate tank, 3 is a sedimentation separator, 4 is a rich liquid pump, 5 is a regeneration tower, 6 is a foam tank, 7 is a foam pump, 8 is a plate and frame filter press, 9 is a molten sulfur kettle, 10 is a filtrate tank, 11 is a filtrate pump, 12 is a desulfurization lean liquid delivery pipeline, 13 is a coke oven gas delivery pipeline, 14 is a purified gas delivery pipeline, 15 is a pressure gauge, 16 is a branch pipe, 17 is a control valve, 18 is a liquid outlet valve, 19 is a liquid outlet pipe, 20 is a slag discharge valve, 21 is a slag discharge pipe, 22 is an air delivery pipeline, 23 is a hopper, 24 is a cylinder, 25 is a sealing door, 26 is a ceramic tubular filter element, 27 is a mounting plate, 28 is a blind hole, 29 is a mounting groove, 30 is an electric push rod, and 31 is a through hole. DETAILED DESCRIPTION

[0019] The present invention is described in further detail below with reference to the accompanying drawings and specific embodiments:

[0020] like Figures 1 to 7As shown, a coke oven gas complex iron method desulfurization tower resistance control device includes a desulfurization tower 1, an intermediate tank 2, a sedimentation separator 3, a rich liquid pump 4, a regeneration tower 5, a foam tank 6, a foam pump 7, a plate and frame filter press 8, a sulfur melting kettle 9, a filtrate tank 10, and a filtrate pump 11. The upper liquid inlet of the desulfurization tower 1 is connected to the desulfurization lean liquid transmission pipeline 12, the lower air inlet is connected to the coke oven gas transmission pipeline 13, the top exhaust port is connected to the purified gas transmission pipeline 14, and the bottom liquid discharge port is connected to the inlet of the intermediate tank 2. Pressure gauges 15 are installed at the top and bottom of the desulfurization tower 1. Two branch pipes 16 are connected in parallel to the outlet of the intermediate tank 2. Both branch pipes 16 are provided with a control valve 17. One branch pipe 16 is connected to the inlet of the rich liquid pump 4, and the other branch pipe 16 is connected to the inlet of the sedimentation separator 3. The liquid outlet of the sedimentation separator 3 is connected to the inlet of the rich liquid pump 4 through a liquid outlet pipe 19 with a liquid outlet valve 18, and the slag outlet of the sedimentation separator 3 is connected to the inlet of the foam pump 7 through a slag outlet pipe 21 with a slag outlet valve 20. The outlet of the rich liquid pump 4 is connected to the lower liquid inlet of the regeneration tower 5, the lower air inlet of the regeneration tower 5 is connected to the air delivery pipeline 22, the top liquid outlet of the regeneration tower 5 is connected to the upper liquid inlet of the desulfurization tower 1, the top foam outlet of the regeneration tower 5 is connected to the inlet of the foam tank 6, the outlet of the foam tank 6 is connected to the inlet of the foam pump 7, the outlet of the foam pump 7 is connected to the inlet of the plate and frame filter press 8, the filter residue outlet of the plate and frame filter press 8 is connected to the inlet of the sulfur melting kettle 9 through the hopper 23, the filtrate outlet of the plate and frame filter press 8 is connected to the inlet of the filtrate tank 10, the outlet of the filtrate tank 10 is connected to the inlet of the filtrate pump 11, and the outlet of the filtrate pump 11 is connected to the lower liquid inlet of the regeneration tower 5;

[0021] During desulfurization production, the complex iron desulfurization lean liquid is transported to the upper liquid inlet of the desulfurization tower 1 through the desulfurization lean liquid transport pipeline 12 and sprayed downward, so that the complex iron desulfurization lean liquid flows from top to bottom and reacts in countercurrent with the coke oven gas transported to the lower air inlet of the desulfurization tower 1 through the coke oven gas transport pipeline 13 and flowing from bottom to top. The desulfurization lean liquid has extremely strong oxidizing properties and can effectively absorb and remove H2S and part of the organic sulfur in the gas. The desulfurized gas is discharged from the top exhaust port of the desulfurization tower 1 and transported to the subsequent process by the purified gas transport pipeline 14. The desulfurization lean liquid that has absorbed H2S becomes a desulfurization rich liquid mainly containing divalent iron ions and sulfur, which is discharged from the bottom drain port of the desulfurization tower 1 into the intermediate tank 2. At this time, the control valve 17, the liquid outlet valve 18, and the slag outlet valve 20 on the branch pipe 16 between the intermediate tank 2 and the sedimentation separator 3 are all in the closed state, and the control valve 17 on the branch pipe 16 between the intermediate tank 2 and the rich liquid pump 4 is opened, so that the rich liquid can be pumped into the regeneration tower 5 by the rich liquid pump 4. Afterwards, air is blown into the regeneration tower 5 through the air conveying pipeline 22 to oxidize the desulfurized rich liquid and regenerate it into desulfurized lean liquid, which is then transported back to the upper part of the desulfurization tower 1 for recycling. At the same time, sulfur foam carrying a large amount of sulfur particles can be generated and discharged from the cone of the regeneration tower 5 into the foam tank 6, and then pumped by the foam pump 7 to the plate and frame filter press 8 for filtration. The filtrate is collected by the filtrate tank 10 and then sent back to the regeneration tower 5 for further regeneration via the filtrate pump 11. The filter cake is a sulfur paste, which is guided and fed by the hopper 23 and can be sent to the sulfur melting kettle 9 for sulfur melting.

[0022] During the process, the pressures in the upper and lower sections of the desulfurization tower 1 can be monitored in real time using two pressure gauges 15 located there. When the pressure differential between the two reaches a certain value, the control valve 17 on the branch pipe 16 between the intermediate tank 2 and the rich liquid pump 4 is closed, and the control valve 17 and the liquid outlet valve 18 on the branch pipe 16 between the intermediate tank 2 and the sedimentation separator 3 are opened. This allows the desulfurized rich liquid to flow through the sedimentation separator 3 before entering the regeneration tower 5. After the sulfur in the rich liquid is effectively filtered out by the sedimentation separator 3, the purified rich liquid is pumped into the regeneration tower 5 for regeneration under the pumping of the rich liquid pump 4. This effectively reduces the sulfur foam generated during regeneration and reduces the entrainment of mist in the desulfurized lean liquid, thereby avoiding further problems such as sulfur blockage and preventing increased resistance to gas rise, which is more conducive to ensuring the overall efficiency and quality of desulfurization. When the sulfur filtered out by sedimentation accumulates to a certain level, the slag valve 20 can be opened, and the sulfur in the sedimentation separator 3 is pumped to the plate and frame filter press 8 through the slag pipe 21 by the foam pump 7 for pressure filtration.

[0023] In this embodiment, the sedimentation separator 3 includes a cylinder 24, the front side of which is open and connected to a sealing door 25 that can be opened and closed. A ceramic tubular filter element 26 is detachably mounted on the inner top of the cylinder 24. The inlet of the sedimentation separator 3 is located on one side of the cylinder 24 below the ceramic tubular filter element 26. The liquid outlet of the sedimentation separator 3 is located on the top of the cylinder 24 corresponding to the inner side of the ceramic tubular filter element 26. The slag outlet of the sedimentation separator 3 is located on the inverted conical bottom of the cylinder 24. During use, the desulfurized rich liquid can enter the cylinder 24 through the inlet of the sedimentation separator 3, then flow from the outside to the inside to the inner side of the ceramic tubular filter element 26, and then be discharged from the liquid outlet of the sedimentation separator 3. In this process, the ceramic tubular filter element 26 can be used to effectively intercept and filter sulfur in the desulfurized rich liquid, effectively intercepting sulfur in the desulfurized rich liquid in the cylinder 24 outside the ceramic tubular filter element 26.

[0024] In this embodiment, the bottom of the ceramic tubular filter element 26 is sealed, and a square mounting plate 27 is fixedly connected to the top. Blind holes 28 are defined on the front, back, left, and right sides of the mounting plate 27. A square mounting slot 29 is defined on the inner top of the cylinder body 24. Electric push rods 30 are located on the top of the cylinder body 24 on the front, back, left, and right sides of the mounting slot 29. The telescopic ends of the electric push rods 30 face toward and extend into the mounting slots 29. The mounting plate 27 is inserted into the mounting slots 29, and the telescopic ends of the electric push rods 30 correspond to and are inserted into the corresponding blind holes 28 on the same side. A through hole 31 is defined in the portion of the mounting plate 27 corresponding to the liquid outlet of the sedimentation separator 3. After a period of use, the sealing door 25 can be opened when the machine is shut down, and the electric push rods 30 can be operated to retract and reset their telescopic ends, thereby releasing the plug-in fixation of the mounting plate 27. The mounting plate 27 can then be pulled out of the mounting slots 29, and the original ceramic tubular filter element 26 can be removed and then removed from the cylinder body 24. Next, after taking out the new ceramic tubular filter element 26, first put it into the cylinder 24, and align the mounting plate 27 with the mounting groove 29 and plug it into place, then run the electric push rod 30 to extend its telescopic end and plug it into the corresponding blind hole 28, plug and fix the mounting plate 27, and the fixed installation of the new ceramic tubular filter element 26 can be completed. The installation is firm and does not affect subsequent use. After that, close the sealing door 25 and continue to use it. In this way, the ceramic tubular filter element 26 can be flexibly and conveniently disassembled and replaced, thereby better ensuring the interception and filtration effect of the desulfurized rich liquid, which is more convenient and practical. The specific method and structure of the openable and closable connection of the sealing door 25 can adopt the existing technology and are not specifically limited here.

[0025] In this embodiment, the mounting plate 27 is matched with the mounting groove 29 , and the telescopic end of the electric push rod 30 is matched with the corresponding blind hole 28 to ensure smooth fixed installation of the ceramic tubular filter element 26 .

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coke oven gas complex iron method desulfurization tower resistance control device, characterized in that: The desulfurization tower comprises a desulfurization tower, an intermediate tank, a sedimentation separator, a rich liquid pump, a regeneration tower, a foam tank, a foam pump, a plate and frame filter press, a sulfur melting kettle, a filtrate tank and a filtrate pump. The upper liquid inlet of the desulfurization tower is connected to the desulfurization lean liquid delivery pipeline, the lower air inlet is connected to the coke oven gas delivery pipeline, the top exhaust port is connected to the purified gas delivery pipeline, and the bottom liquid discharge port is connected to the inlet of the intermediate tank. Pressure gauges are installed on the upper and lower parts of the desulfurization tower. Two branch pipes are connected in parallel to the outlet of the intermediate tank. Both branch pipes are provided with control valves, one of which is connected to the inlet of the rich liquid pump and the other is connected to the inlet of the sedimentation separator. The liquid outlet of the sedimentation separator is connected to the inlet of the rich liquid pump through a liquid outlet pipe with a liquid outlet valve. The slag outlet of the desulfurizer is connected to the inlet of the foam pump through a slag outlet pipe with a slag valve, the outlet of the rich liquid pump is connected to the lower liquid inlet of the regeneration tower, the lower air inlet of the regeneration tower is connected to the air conveying pipeline, the top liquid outlet of the regeneration tower is connected to the upper liquid inlet of the desulfurization tower, the top foam outlet of the regeneration tower is connected to the inlet of the foam tank, the outlet of the foam tank is connected to the inlet of the foam pump, the outlet of the foam pump is connected to the inlet of the plate and frame filter press, the filter residue outlet of the plate and frame filter press is connected to the inlet of the molten sulfur kettle through a hopper, the filtrate outlet of the plate and frame filter press is connected to the inlet of the filtrate tank, the outlet of the filtrate tank is connected to the inlet of the filtrate pump, and the outlet of the filtrate pump is connected to the lower liquid inlet of the regeneration tower.

2. The coke oven gas complex iron method desulfurization tower resistance control device according to claim 1, characterized in that: The sedimentation separator includes a cylinder, the front side of which is open and connected to a sealing door that can be opened and closed, a ceramic tubular filter element is detachably provided on the inner top of the cylinder, the inlet of the sedimentation separator is opened on one side of the cylinder below the ceramic tubular filter element, the liquid outlet of the sedimentation separator is opened on the top of the cylinder corresponding to the inner side of the ceramic tubular filter element, and the slag outlet of the sedimentation separator is opened on the bottom of the cylinder in an inverted cone shape.

3. The coke oven gas complex iron method desulfurization tower resistance control device according to claim 2, characterized in that: The bottom of the ceramic tubular filter element is closed and a square mounting plate is fixedly connected to the top. Blind holes are provided on the front, back, left and right sides of the mounting plate. A square mounting groove is provided on the inner top of the cylinder. Electric push rods are built into the top of the cylinder on the front, back, left and right sides of the mounting groove. The telescopic ends of the electric push rods face and can extend into the mounting groove. The mounting plate is inserted into the mounting groove. The telescopic ends of the electric push rods correspond to the blind holes on the same side and are inserted into the corresponding blind holes. A through hole is provided on the portion of the mounting plate corresponding to the liquid outlet of the sedimentation separator.

4. The coke oven gas complex iron method desulfurization tower resistance control device according to claim 3, characterized in that: The mounting plate is adapted to the mounting groove.

5. The coke oven gas complex iron method desulfurization tower resistance control device according to claim 3, characterized in that: The telescopic end of the electric push rod is adapted to the corresponding blind hole.

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