MEDA desulfurized gas complex iron desulfurization tower and desulfurization system

Abstract

A complex iron desulfurization tower and desulfurization system for MEDA desulfurization and analysis gas, the bottom of the tower body of the desulfurization tower is provided with a desulfurization rich liquid outlet, the upper part is provided with an induced gas outlet, and the top is provided with an exhaust gas channel; the jet valve is provided on the outside of the tower body, the working liquid inlet of the jet valve is connected to the MEDA desulfurization and analysis gas, the induced gas inlet is connected to the induced gas outlet on the tower body, the working liquid outlet is connected to the gas distributor located at the lower part of the tower body through an air inlet pipe, and the air inlet pipe is connected with a nitrogen supplementary pipeline; a first flowmeter is provided on the exhaust gas channel, a second flowmeter is provided on the channel of the working liquid inlet of the jet valve, and a third flowmeter is provided on the nitrogen supplementary pipeline; an ultrasonic vibration device is installed on the inner wall of the middle part of the tower body, and the ultrasonic vibration device is arranged circumferentially around the inner wall of the tower body; a stirring device is installed at the central axis of the upper part of the tower body. The present application can solve the problems of FeS precipitation, rapid reagent loss, and poor desulfurization effect caused by excessive H2S concentration, and improve the desulfurization efficiency of complex iron.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas desulfurization processing, and in particular to a complex iron desulfurization tower and a desulfurization system for MEDA desulfurized analytical gas. Background Art

[0002] With the development of global industry, the demand for energy is increasing day by day, and natural gas has become a necessity for the sustainable development of energy and environment. As a green and clean energy, the development and utilization of natural gas has attracted more and more attention. To develop the natural gas industry, it is necessary to study and develop natural gas purification technology, solve the problems of natural gas transportation, storage and harmless utilization, especially to remove sulfides in natural gas and reduce pollution from the source.

[0003] At present, the MDEA method is widely used in natural gas desulfurization. The chemical name of MDEA is methyldiethanolamine, and generally a 25% to 50% MDEA solution is used. When the H2S gas in the natural gas passes through the MDEA solution, H2S will react with it at a very fast speed to achieve the purpose of removing H2S, so this method is also called chemical absorption. In industry, an absorption tower is used for chemical absorption desulfurization, and an analytical regeneration tower is used to analyze and regenerate the MDEA solution. In the absorption tower, the natural gas is in countercurrent contact with the MDEA solution, and the MDEA solution absorbs most of the H2S in the natural gas. The purified natural gas is discharged from the upper part of the absorption tower, and the rich liquid solution rich in H2S flows out from the bottom of the absorption tower. After that, the rich liquid solution enters the flash tank, and the hydrocarbon impurities absorbed in the rich liquid solution are removed by flash depressurization. The rich liquid solution after flash depressurization is pumped into the analytical regeneration tower, and the H2S and part of the CO2 in the rich liquid solution are analyzed and released and become a lean liquid solution. After the lean liquid solution recovers heat through the heat exchanger, it is pressurized and pumped into the absorption tower by the circulation pump for circulation.

[0004] The acidic gas collected by the analytical regeneration tower is relatively simple in composition, among which the H2S content is as high as 40% to 70%. In industry, a desulfurization tower is used to desulfurize the analytical gas containing H2S, and an oxidation regeneration tower is used to oxidize and regenerate the desulfurized liquid. The complex iron wet desulfurization process is commonly used for desulfurization. In the desulfurization tower, the desulfurization liquid uses trivalent complex iron ions as a catalyst, and the desulfurization liquid is in convection contact with the analytical gas. H2S is dissolved in the desulfurization liquid and converted into elemental sulfur. At the same time, the trivalent complex iron ions in the desulfurization liquid are reduced to divalent complex iron ions. The desulfurization liquid rich in divalent complex iron ions and elemental sulfur enter the oxidation regeneration tower for regeneration. In the oxidation regeneration tower, the oxidation regeneration process uses air as an oxidant, and the oxygen in the air reoxidizes the divalent complex iron ions in the desulfurization liquid into trivalent complex iron ions. After regeneration, the desulfurization liquid rich in trivalent complex iron ions is pumped into the desulfurization tower for recycling. The regenerated sulfur foam is collected and settled as sulfur for recovery.

[0005] In the desulfurization tower of the above technical solution, due to the insufficient performance of the desulfurizer, it is easy to have problems such as excessive H2S concentration, FeS precipitation, rapid reagent loss, and poor desulfurization effect. Therefore, there is an urgent need for a desulfurization equipment that can avoid the desulfurization effect being affected by excessive H2S concentration. Utility Model Content

[0006] In order to solve at least one of the problems mentioned in the background technology, the embodiment of the present application provides a complex iron desulfurization tower and desulfurization system for MEDA desulfurization and analysis gas, which can effectively control the H2S concentration to maintain stability, avoid the problems of FeS precipitation and rapid loss of reagents, and effectively improve the desulfurization effect.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the embodiment of the present application provides a complex iron desulfurization tower for MEDA desulfurization and analysis gas, including a tower body, a jet valve, a gas distributor, an ultrasonic vibration device and a stirring device;

[0008] The bottom of the tower body is provided with a desulfurized rich liquid outlet, the upper part of the tower body is provided with an induced gas outlet, and the top of the tower body is provided with an exhaust gas channel;

[0009] The jet valve is arranged outside the tower body, the working fluid inlet of the jet valve is connected to the MEDA desulfurized analytical gas, the induced gas inlet of the jet valve is connected to the induced gas outlet on the tower body, and the working fluid outlet of the jet valve is connected to the gas distributor located at the lower part of the tower body through an air inlet pipe;

[0010] A first flow meter is provided on the exhaust gas channel, and a second flow meter is provided on the channel of the working fluid inlet of the jet valve, and the first flow meter and the second flow meter are both electrically connected to a controller;

[0011] The ultrasonic vibration device is installed on the inner wall of the middle part of the tower body, and the ultrasonic vibration device is arranged around the circumference of the inner wall of the tower body;

[0012] The stirring device is installed at the central axis of the upper part of the tower body.

[0013] In a feasible embodiment, the stirring device comprises a first stirrer and a second stirrer which are arranged opposite to each other, the first stirrer stirs in a clockwise direction, and the second stirrer stirs in a counterclockwise direction.

[0014] In a feasible implementation, the first agitator and the second agitator are disposed up and down opposite to each other and are connected to the same agitation motor through respective agitation shafts.

[0015] In an achievable embodiment, the first agitator includes a first agitating blade and a first agitating shaft, and the second agitator includes a second agitating blade and a second agitating shaft;

[0016] The first stirring shaft and the second stirring shaft both extend along the central axis of the tower body, the first stirring blade and the second stirring blade are respectively connected to ends of the first stirring shaft and the second stirring shaft that are away from each other, and the first bevel gear and the second bevel gear are respectively installed at ends of the first stirring shaft and the second stirring shaft that are close to each other;

[0017] A positioning gear and a transmission gear are arranged between the first stirring shaft and the second stirring shaft. The positioning gear and the transmission gear are arranged opposite to each other and are meshed with the first bevel gear and the second bevel gear for transmission. The transmission gear is connected to the stirring motor via the motor shaft.

[0018] In a feasible embodiment, shaft sleeves are provided on the outer peripheries of the motor shaft, the first stirring shaft and the second stirring shaft, the motor shaft, the first stirring shaft and the second stirring shaft are all mounted on the shaft sleeves through bearings, and the positioning gear is connected to the positioning shaft and is mounted in the shaft sleeves through a positioning bearing.

[0019] In a feasible embodiment, the stirring device is provided with a supporting device, and the supporting device is arranged below the stirring shaft located below, and the supporting device includes a connecting shaft, a connecting bearing, a bearing seat and a support rod, the upper end of the connecting shaft is inserted into the lower end of the stirring shaft located below, and the lower end of the connecting shaft is fixed in the bearing seat through a connecting bearing, one end of the support rod is connected to the bearing seat, and the other end of the support rod is fixedly connected to the inner wall of the tower body.

[0020] In an achievable embodiment, the first stirring blade and the second stirring blade each include a blade sleeve and a blade, the blade sleeve is key-connected to the corresponding stirring shaft, the blade includes at least two blades, and at least two of the blades are connected to the blade sleeve in a forward tilted manner in the circumferential direction.

[0021] A second aspect of an embodiment of the present application provides a complex iron desulfurization system for MEDA desulfurized analytical gas, comprising the above-mentioned desulfurization tower.

[0022] In an achievable embodiment, the regeneration tower further comprises a regeneration tower, wherein the regeneration tower has a tower bottom with a closed lower portion, a liquid inlet is arranged on one side of the middle portion of the tower bottom, a sulfur slurry outlet is arranged at the bottom of the tower bottom, and a lean liquid outlet is arranged on the upper side of the regeneration tower opposite to the liquid inlet;

[0023] The desulfurization rich liquid outlet of the desulfurization tower is connected to the liquid inlet of the regeneration tower, an air branch is arranged on the pipeline of the liquid inlet of the regeneration tower, and the lean liquid outlet is connected to the liquid return outlet located at the upper part of the desulfurization tower.

[0024] In a feasible embodiment, a first baffle and a second baffle extending vertically in parallel are arranged in the regeneration tower, the first baffle is arranged close to the liquid inlet, the lower part of the first baffle is connected to the bottom of the regeneration tower, an overflow space is arranged between the upper part of the first baffle and the top of the regeneration tower, the second baffle is arranged close to the lean liquid outlet, the upper part of the second baffle is connected to the top of the regeneration tower, and a lean liquid reflux space is arranged between the lower part of the second baffle and the bottom of the regeneration tower.

[0025] The complex iron desulfurization tower of MEDA desulfurization and analysis gas provided by the present application introduces partially desulfurized purified gas through a jet valve to dilute the natural gas analysis gas to be treated, which can increase the air intake, reduce the H2S concentration, and reduce the amount of nitrogen, so that the desulfurization tower intake is stable and the concentration is stable. An ultrasonic vibration device is arranged above the gas distributor to break the analysis gas bubbles bulging out of the distributor into small bubbles, increase the gas-liquid contact area, accelerate the desulfurization speed, and improve the H2S removal rate. A stirring device is also arranged in the desulfurization tower to break the rising and aggregated large bubbles into small bubbles again, strengthen the mixing effect with the desulfurization liquid, make the residual H2S in the analysis gas fully react, reduce the H2S concentration of the tail gas, and reduce the corrosion of subsequent equipment, that is, the comprehensive pre-dilution, ultrasonic shattering and stirring dilution means to ensure the stability of the H2S concentration, solve the problems of FeS precipitation, rapid loss of reagents and poor desulfurization effect caused by excessive H2S concentration. The complex iron desulfurization system of MEDA desulfurization and analysis gas provided by the present application includes the above-mentioned desulfurization tower, which has the same beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application 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 present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of the complex iron desulfurization system for MEDA desulfurization and analysis gas provided in the embodiment of the present application;

[0028] Figure 2 A schematic diagram of the installation of the stirring device provided in the embodiment of the present application in the tower body;

[0029] Figure 3 A schematic diagram of the structure of a stirring device (stirring blades not shown) provided in an embodiment of the present application;

[0030] Figure 4 An exploded view of a stirring device (stirring blades not shown) provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a first stirring blade provided in an embodiment of the present application;

[0032] Figure 6 Based Figure 5 A partial enlarged view of the middle part;

[0033] Figure 7 for Figure 5 A top view of

[0034] Figure 8 A schematic diagram of the structure of a second stirring blade provided in an embodiment of the present application;

[0035] Fig. 9 A top view of the connecting shaft provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100-desulfurization tower;

[0038] 110-tower body; 110a-injection gas outlet; 120-jet valve; 130-gas distributor; 140-ultrasonic vibration device; 150-exhaust gas channel;

[0039] 200- stirring device;

[0040] 210-first stirrer; 211-first stirring blade; 211a-blade sleeve; 211b-blade;

[0041] 212-first stirring shaft; 213-first bevel gear;

[0042] 220-second stirrer; 221-second stirring blade; 222-second stirring shaft; 223-second

[0043] Bevel gear;

[0044] 230-shaft sleeve; 231-positioning gear; 232-transmission gear; 233-motor shaft; 234-bearing;

[0045] 235-positioning shaft; 236-positioning bearing;

[0046] 240-support device; 241-connecting shaft; 242-connecting bearing; 243-bearing seat; 244-support rod;

[0047] 300-Regeneration tower;

[0048] 301-first baffle; 302-second baffle; 310-regeneration zone; 320-sedimentation zone;

[0049] 400-lean and rich liquid heat exchanger; 500-air flotation machine; 600-sulfur slurry pump; 700-plate and frame filter press; 800-filtrate tank; 900-filtrate pump. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the embodiment of the present application. It is worth noting that the embodiments described in the drawings are only part of the embodiments of the present application, not all of the embodiments. That is, the embodiments described by the drawings are exemplary and are intended to be used to explain the present application, and cannot be understood as limiting the present application.

[0051] The following will be combined Figures 1 to 9 The complex iron desulfurization tower 100 and the desulfurization system for MEDA desulfurization and analysis gas provided in the embodiment of the present application are described.

[0052] The present application embodiment provides a complex iron desulfurization tower for MEDA desulfurization and analysis gas, such as Figure 1 As shown, it includes a tower body 110 , a jet valve 120 , a gas distributor 130 , an ultrasonic vibration device 140 and a stirring device 200 .

[0053] A desulfurized rich liquid outlet is disposed at the bottom of the tower body 110 , an induced gas outlet 110 a is disposed at the top of the tower body 110 , and a tail gas channel 150 is disposed at the top of the tower body 110 .

[0054] The jet valve 120 is arranged on the outside of the tower body 110, the working fluid inlet of the jet valve 120 is connected to the MEDA desulfurization analysis gas, the induced gas inlet of the jet valve 120 is connected to the induced gas outlet 110a on the tower body 110, and the working fluid outlet of the jet valve 120 is connected to the gas distributor located at the lower part of the tower body 110 through the air inlet pipe, and the air inlet pipe is connected to a nitrogen supplementary pipeline.

[0055] A first flow meter is provided on the tail gas channel 150, a second flow meter is provided on the channel of the working fluid inlet of the jet valve 120, a third flow meter is provided on the nitrogen supplement pipeline, and the first flow meter, the second flow meter and the third flow meter are all electrically connected to the controller.

[0056] The ultrasonic vibration device 140 is installed on the inner wall of the middle part of the tower body 110 , and the ultrasonic vibration device 140 is arranged around the circumference of the inner wall of the tower body 110 .

[0057] The stirring device 200 is installed at the central axis of the upper part of the tower body 110 .

[0058] The induced gas outlet 110a is used to reintroduce a portion of the desulfurized purified gas in the purified gas at the top of the tower body 110 into the natural gas analysis gas, thereby increasing the intake gas volume and reducing the H2S concentration, and using it locally, reasonably and efficiently.

[0059] Determine the appropriate dilution multiple based on the H2S concentration in the desulfurization gas and the desulfurization agent content in the desulfurization liquid, select the jet valve 120 of the corresponding specification, and control the flowmeters on each pipeline through the controller to control the desulfurization gas flow, nitrogen flow, and the outlet flow of the desulfurization tower 100 in a chain manner. By adjusting the nitrogen flow, the air intake of the desulfurization tower 100 is ensured to be stable. At the same time, the nitrogen flow is adjusted according to the change of the desulfurization gas flow, so as to stabilize the H2S concentration in the gas in the tower body 110.

[0060] The complex iron desulfurization tower 100 for MEDA desulfurization and analysis gas provided in the present application introduces partially desulfurized purified gas through the jet valve 120 to dilute the natural gas analysis gas to be treated, which can increase the air intake, reduce the H2S concentration, and reduce the amount of nitrogen, so that the air intake of the desulfurization tower 100 is smooth and the concentration is stable. The ultrasonic generator above the gas distributor 130 breaks the analysis gas bubbles bulging out of the distributor into small bubbles, increases the gas-liquid contact area, accelerates the desulfurization speed, and improves the H2S removal rate. The desulfurization tower 100 is also provided with a stirring device 200 to break the rising and coalesced large bubbles into small bubbles again, strengthen the mixing effect with the desulfurization liquid, make the residual H2S in the analysis gas fully react, reduce the H2S concentration in the tail gas, and reduce corrosion to subsequent equipment.

[0061] The complex iron desulfurization tower 100 of the MEDA desulfurization and analysis gas of the present application combines pre-dilution, ultrasonic crushing and stirring dilution to effectively ensure the stability of H2S concentration, solve the problems of FeS precipitation, rapid reagent loss and poor desulfurization effect caused by excessive H2S concentration, reduce various operating costs, improve desulfurization efficiency, and facilitate subsequent regeneration and other process operations.

[0062] In one possible implementation, Figures 1-2 , Figure 5 as well as Figure 8 As shown, the stirring device 200 includes a first stirrer 210 and a second stirrer 220 which are arranged opposite to each other. The first stirrer 210 stirs in a clockwise direction, and the second stirrer 220 stirs in a counterclockwise direction.

[0063] Among them, the first agitator 210 and the second agitator 220 make the stirring device 200 have an anisotropic shearing effect, so that the desulfurization liquid has an obviously irregular flow. At the same time, the anisotropic stirring can offset its rotational inertia. This setting can greatly enhance the mixing effect with the desulfurization liquid, so that the residual H2S in the analysis gas can fully react, further reduce the H2S concentration in the purified gas, reduce corrosion to subsequent equipment, and also improve the overall stability of the desulfurization tower 100 and extend the service life of the equipment.

[0064] In one possible implementation, Figures 2-3 As shown, the first agitator 210 and the second agitator 220 are disposed up and down opposite to each other and are connected to the same agitation motor through their respective agitation shafts.

[0065] With this arrangement, the first agitator 210 and the second agitator 220 can achieve synchronous agitation when driven by the same agitation motor, and are easy to install and maintain.

[0066] In one possible implementation, Figures 2 to 4 As shown, the first agitator 210 includes a first agitating blade 211 and a first agitating shaft 212 , and the second agitator 220 includes a second agitating blade 221 and a second agitating shaft 222 .

[0067] The first stirring shaft 212 and the second stirring shaft 222 both extend along the central axis of the tower body 110, and the first stirring blade 211 and the second stirring blade 221 are respectively connected to the ends of the first stirring shaft 212 and the second stirring shaft 222 that are away from each other, and the first bevel gear 213 and the second bevel gear 223 are respectively installed at the ends of the first stirring shaft 212 and the second stirring shaft 222 that are close to each other.

[0068] A positioning gear 231 and a transmission gear 232 are arranged between the first stirring shaft 212 and the second stirring shaft 222 . The positioning gear 231 and the transmission gear 232 are arranged opposite to each other and are meshed with the first bevel gear 213 and the second bevel gear 223 for transmission. The transmission gear 232 is connected to the stirring motor via the motor shaft 233 .

[0069] With this arrangement, the stirring device 200 has a simple structure and a stable transmission relationship, which helps the first stirrer 210 and the second stirrer 220 to work effectively.

[0070] In one possible implementation, Figures 2-3 , Figure 5 and Figure 8As shown, a shaft sleeve 230 is provided on the outer periphery of the motor shaft 233, the first stirring shaft 212 and the second stirring shaft 222. The motor shaft 233, the first stirring shaft 212 and the second stirring shaft 222 are all installed on the shaft sleeve 230 through bearings 234. The positioning gear 231 is connected to the positioning shaft 235 and is installed in the shaft sleeve 230 through a positioning bearing 236.

[0071] One end of the motor shaft 233 extending out of the sleeve 230 is connected to the stirring motor, one end of the second stirring shaft 222 extending out of the sleeve 230 is connected to the second stirring blade 221 , and one end of the first stirring shaft 212 extending out of the sleeve 230 is connected to the first stirring blade 211 .

[0072] With this arrangement, the transmission part of the stirring device 200 can maintain stable transmission under the protection of the shaft sleeve 230, and is easy to install and maintain.

[0073] In one possible implementation, Figures 2-3 and Fig. 9 As shown, the stirring device 200 is provided with a supporting device 240, which is arranged below the stirring shaft located below. The supporting device 240 includes a connecting shaft 241, a connecting bearing 242, a bearing seat 243 and a support rod 244. The upper end of the connecting shaft 241 is inserted into the lower end of the stirring shaft located below, and the lower end of the connecting shaft 241 is fixed in the bearing seat 243 through the connecting bearing 242. One end of the support rod 244 is connected to the bearing seat 243, and the other end of the support rod 244 is fixedly connected to the inner wall of the tower body 110.

[0074] Among them, the plug connector and the plug hole connecting the connecting shaft 241 and the stirring shaft can be square in cross section, which is convenient for the transmission of torque and improves the installation stability and operation safety of the stirring device 200.

[0075] In one possible implementation, Figures 5 to 8 As shown, the first stirring blade 211 and the second stirring blade 221 both include a blade sleeve 211a and a blade 211b, the blade sleeve 211a is keyed to the corresponding stirring shaft, and the blade 211b includes at least two blades, at least two blades 211b are connected to the blade sleeve 211a in a circumferential direction and are inclined in the forward direction.

[0076] Each blade 211b has an angle of 30° to 60° with the axial direction of the blade sleeve 211a, and small holes are evenly arranged on the blade 211b. In this embodiment, the angle is 45°.

[0077] With this arrangement, the desulfurization liquid has stronger fluidity and better crushing efficiency, which further enhances the mixing effect of the gas and desulfurization liquid in the tower and improves the desulfurization reaction efficiency.

[0078] The embodiment of the present application provides a complex iron desulfurization system for MEDA desulfurized analytical gas, including the above-mentioned desulfurization tower 100.

[0079] The H2S concentration in the desulfurization tower 100 of the complex iron desulfurization system of the MEDA desulfurization and analysis gas of the present application is stable, and the desulfurization system as a whole has the beneficial effects of fast regeneration speed and good regeneration effect.

[0080] In one possible implementation, Figure 1 As shown, it also includes a regeneration tower 300, which has a bottom with a closed lower end, a liquid inlet is arranged on one side of the middle of the bottom, a sulfur slurry outlet is arranged at the bottom of the bottom, and a lean liquid outlet is arranged on the upper side of the regeneration tower 300 opposite to the liquid inlet.

[0081] The desulfurization rich liquid outlet of the desulfurization tower 100 is connected to the liquid inlet of the regeneration tower 300. An air branch is arranged on the pipeline of the liquid inlet of the regeneration tower 300. The lean liquid outlet is connected to the liquid return port located at the upper part of the desulfurization tower 100.

[0082] Among them, the desulfurization system also includes a lean-rich liquid heat exchanger 400. The liquid at the desulfurization rich liquid outlet of the desulfurization tower 100 flows to the liquid inlet of the regeneration tower 300 via the tube side of the lean-rich liquid heat exchanger 400, and the liquid at the lean liquid outlet of the regeneration tower 300 flows to the liquid return port at the top of the desulfurization tower 100 via the shell side of the lean-rich liquid heat exchanger 400.

[0083] This setting makes full use of the system thermal energy and improves the desulfurization efficiency and regeneration efficiency.

[0084] In a feasible embodiment, a first baffle 301 and a second baffle 302 extending parallel and vertically are arranged in the regeneration tower 300, the first baffle 301 is arranged near the liquid inlet, the lower part of the first baffle 301 is connected to the bottom of the regeneration tower 300, an overflow space is arranged between the upper part of the first baffle 301 and the top of the regeneration tower 300, the second baffle 302 is arranged near the lean liquid outlet, the upper part of the second baffle 302 is connected to the top of the regeneration tower 300, and a lean liquid reflux space is arranged between the lower part of the second baffle 302 and the bottom of the regeneration tower 300.

[0085] The area near the liquid inlet of the first baffle 301 in the regeneration tower 300 forms a regeneration zone 310, and the area on the other side of the first baffle 301 forms a settling zone 320. A regenerated sulfur slurry outlet is provided at the bottom of the settling zone 320 to facilitate the discharge of sulfur in the settling zone 320. The second baffle 302 is mainly used to control the settling area of ​​sulfur particles, reduce entrainment in the desulfurized lean liquid, and also reduce sulfur accumulation and blockage in the dead corners of the desulfurization system.

[0086] The desulfurization system also includes a flotation machine 500, a first inlet of the flotation machine 500 is connected to the desulfurization rich liquid outlet of the desulfurization tower 100 via the pipe outlet of the lean-rich liquid heat exchanger 400, a second inlet of the flotation machine 500 is connected to the air branch, and an outlet of the flotation machine 500 is connected to the liquid inlet of the regeneration tower 300.

[0087] The regeneration zone 310 mainly reacts air with the desulfurized liquid. The air flotation machine 500 greatly reduces the size of air bubbles, that is, the contact area between oxygen and the desulfurized rich liquid is greatly increased, which is beneficial to accelerate the speed of the oxidation reaction and shorten the regeneration time. At the same time, it can also reduce the liquid holding volume to a certain extent and reduce the size of the regeneration tower 300. The regenerated desulfurized liquid and sulfur foam overflow to the sedimentation zone 320 for sulfur sedimentation. Due to the use of the air flotation machine 500, the bubbles are small and dense, so the sulfur foam is fine and easy to float. The setting of the sedimentation zone 320 is conducive to the growth and sedimentation of sulfur particles.

[0088] The desulfurization system also includes a sulfur slurry pump 600, a plate-frame filter press 700, a filtrate tank 800 and a filtrate pump 900. A sulfur slurry outlet is provided at the bottom of the regeneration zone 310. The sulfur slurry outlet and the regenerated sulfur slurry outlet are respectively connected to the inlet of the sulfur slurry pump 600. The outlet of the sulfur slurry pump 600 is connected to the inlet on one side of the plate-frame filter press 700. A sulfur paste outlet is provided at the bottom of the plate-frame filter press 700. The filtrate outlet on the other side of the plate-frame filter press 700 is connected to the top of the filtrate tank 800. The bottom of the filtrate tank 800 is connected to the reflux port at the top of the regeneration tower 300 via the filtrate pump 900. The sulfur settled to the bottom of the regeneration tower is pumped into the plate-frame filter press 700 for separation and filtration by the sulfur slurry pump 600, and the supernatant, i.e., the desulfurized lean liquid, is returned to the desulfurization tower 100 for cyclic desulfurization.

[0089] The settled sulfur that may exist in the regeneration zone 310 is regularly pumped out of the system through the sulfur slurry outlet without the need for personnel to enter, thus reducing the danger of manual cleaning and being safe and convenient.

[0090] It should be noted that, unless otherwise clearly specified and limited, in the description of this application, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0091] The orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0092] The term "plurality" means two or more than two, unless expressly specified otherwise.

[0093] The terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can include sequential implementations other than those illustrated or described herein.

[0094] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A complex iron desulfurization tower for MEDA desulfurization and analysis gas, characterized in that: It includes a tower body, a jet valve, a gas distributor, an ultrasonic vibration device and a stirring device; The bottom of the tower body is provided with a desulfurized rich liquid outlet, the upper part of the tower body is provided with an induced gas outlet, and the top of the tower body is provided with an exhaust gas channel; The jet valve is arranged outside the tower body, the working fluid inlet of the jet valve is connected to the MEDA desulfurized analytical gas, the induced gas inlet of the jet valve is connected to the induced gas outlet on the tower body, the working fluid outlet of the jet valve is connected to the gas distributor located at the lower part of the tower body through an air inlet pipe, and the air inlet pipe is connected to a nitrogen supplement pipeline; A first flow meter is provided on the exhaust gas channel, a second flow meter is provided on the channel of the working fluid inlet of the jet valve, and a third flow meter is provided on the nitrogen supplement pipeline, and the first flow meter, the second flow meter and the third flow meter are all electrically connected to the controller; The ultrasonic vibration device is installed on the inner wall of the middle part of the tower body, and the ultrasonic vibration device is arranged around the circumference of the inner wall of the tower body; The stirring device is installed at the central axis of the upper part of the tower body.

2. The complex iron desulfurization tower for MEDA desulfurization and analysis gas according to claim 1, characterized in that: The stirring device comprises a first stirrer and a second stirrer which are arranged opposite to each other, wherein the first stirrer stirs in a clockwise direction and the second stirrer stirs in a counterclockwise direction.

3. The complex iron desulfurization tower for MEDA desulfurization and analysis gas according to claim 2, characterized in that: The first stirrer and the second stirrer are disposed up and down opposite to each other and are connected to the same stirring motor through their respective stirring shafts.

4. The complex iron desulfurization tower for MEDA desulfurization and analysis gas according to claim 3, characterized in that: The first agitator includes a first agitating blade and a first agitating shaft, and the second agitator includes a second agitating blade and a second agitating shaft; The first stirring shaft and the second stirring shaft both extend along the central axis of the tower body, the first stirring blade and the second stirring blade are respectively connected to ends of the first stirring shaft and the second stirring shaft that are away from each other, and the first bevel gear and the second bevel gear are respectively installed at ends of the first stirring shaft and the second stirring shaft that are close to each other; A positioning gear and a transmission gear are arranged between the first stirring shaft and the second stirring shaft. The positioning gear and the transmission gear are arranged opposite to each other and are meshed with the first bevel gear and the second bevel gear for transmission. The transmission gear is connected to the stirring motor via the motor shaft.

5. The complex iron desulfurization tower for MEDA desulfurization and analysis gas according to claim 4, characterized in that: The outer peripheries of the motor shaft, the first stirring shaft and the second stirring shaft are all provided with shaft sleeves, and the motor shaft, the first stirring shaft and the second stirring shaft are all mounted on the shaft sleeves through bearings, and the positioning gear is connected to the positioning shaft and is mounted in the shaft sleeves through a positioning bearing.

6. The complex iron desulfurization tower for MEDA desulfurization and analysis gas according to claim 3, characterized in that: The stirring device is provided with a supporting device, and the supporting device is arranged below the stirring shaft located below. The supporting device includes a connecting shaft, a connecting bearing, a bearing seat and a supporting rod. The upper end of the connecting shaft is inserted into the lower end of the stirring shaft located below, and the lower end of the connecting shaft is fixed in the bearing seat through a connecting bearing. One end of the supporting rod is connected to the bearing seat, and the other end of the supporting rod is fixedly connected to the inner wall of the tower body.

7. The complex iron desulfurization tower for MEDA desulfurization and analysis gas according to claim 4, characterized in that: The first stirring blade and the second stirring blade both include a blade sleeve and a blade. The blade sleeve is key-connected to the corresponding stirring shaft. The blade includes at least two blades, and at least two blades are connected to the blade sleeve in a forward tilted manner in the circumferential direction.

8. A complex iron desulfurization system for MEDA desulfurized analytical gas, characterized in that: Comprising the desulfurization tower as described in any one of claims 1 to 7.

9. The MEDA desulfurized analyte gas complex iron desulfurization system according to claim 8, characterized in that: It also includes a regeneration tower, which has a bottom with a closed lower end, a liquid inlet is arranged on one side of the middle of the bottom, a sulfur slurry outlet is arranged at the bottom of the bottom, and a lean liquid port is arranged on the upper side of the regeneration tower opposite to the liquid inlet; the desulfurization rich liquid outlet of the desulfurization tower is connected to the liquid inlet of the regeneration tower, an air branch is arranged on the pipeline of the liquid inlet of the regeneration tower, and the lean liquid port is connected to the liquid return port located at the upper part of the desulfurization tower.

10. The MEDA desulfurized analyte gas complex iron desulfurization system according to claim 9, characterized in that: A first baffle and a second baffle extending vertically in parallel are arranged in the regeneration tower, the first baffle is arranged near the liquid inlet, the lower part of the first baffle is connected to the bottom of the regeneration tower, an overflow space is arranged between the upper part of the first baffle and the top of the regeneration tower, the second baffle is arranged near the lean liquid outlet, the upper part of the second baffle is connected to the top of the regeneration tower, and a lean liquid reflux space is arranged between the lower part of the second baffle and the bottom of the regeneration tower.

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