CN113908683B - Liquefied petroleum gas desulphurization device - Google Patents
Liquefied petroleum gas desulphurization device Download PDFInfo
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- CN113908683B CN113908683B CN202111518943.XA CN202111518943A CN113908683B CN 113908683 B CN113908683 B CN 113908683B CN 202111518943 A CN202111518943 A CN 202111518943A CN 113908683 B CN113908683 B CN 113908683B
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/485—Sulfur compounds containing only one sulfur compound other than sulfur oxides or hydrogen sulfide
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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Abstract
The invention discloses a liquefied petroleum gas desulfurization device, and relates to the technical field of liquefied petroleum gas desulfurization. Including extraction tower, regenerator column and alkali lye tail gas knockout drum, be connected with the conveyer pipe that is used for carrying alkali lye between extraction tower and the regenerator column, the extraction tower bottom is connected with the intake pipe that is used for carrying the liquefied gas, has connected gradually alkali lye admission pipe and regeneration alkali lye discharge pipe between alkali lye tail gas knockout drum bottom and the regenerator column, and the alkali lye admission pipe is arranged in carrying alkali lye tail gas knockout drum with the alkali lye in the regenerator column, still be connected with the back flow between regenerator column and the extraction tower, the back flow is arranged in carrying the extraction tower with the regeneration alkali lye in the regenerator column. The invention utilizes the detection component to simply and effectively measure the RSSR content in the alkali liquor, has simple and convenient measurement process, and conveniently and flexibly adjusts the control index of the regeneration process, thereby ensuring the quality of the regenerated alkali liquor and ensuring that the catalyst alkali liquor is not easy to lose efficacy.
Description
Technical Field
The invention relates to the technical field of liquefied petroleum gas desulfurization, in particular to a liquefied petroleum gas desulfurization device.
Background
The liquefied petroleum gas is a colorless volatile gas obtained by pressurizing, cooling and liquefying refinery gas and natural gas, and the refinery gas is a large amount of C produced by vacuum distillation, catalytic cracking, catalytic reforming, hydrocracking and the like in the crude oil processing process2-C4Small hydrocarbons with a low content of C5And impurities such as sulfur-containing compounds. The main uses of liquefied petroleum gas are two: firstly, the product is used as a chemical product; secondly, the sulfur-containing liquefied petroleum gas is widely used as raw material gas and other gas fuels, particularly as automobile clean fuel gas, but contains a certain amount of liquefied petroleum gas sulfide, so that the gas has to be desulfurized firstly whether being used as chemical raw material or gas fuel.
The invention discloses a liquefied petroleum gas desulfurization purification system and a purification method, wherein a complex iron catalyst desulfurization solution is used for simultaneously converting hydrogen sulfide in liquefied petroleum gas into sulfur and converting mercaptan into disulfide, so that the defect that two sets of processes are adopted in the traditional liquefied petroleum gas desulfurization is overcome, the investment and the operation cost are greatly saved, the operation is simplified, the defect that a large amount of alkaline residues are caused by intermittent discharge of alkali liquor when mercaptan is oxidized into disulfide is overcome, the alkaline residues are eliminated, and the environment is protected.
However, the desulfurization device has two problems in the actual production process, firstly, the reason for the failure of the alkaline catalyst solution in the regeneration process is mainly that the content of RSSR in the alkaline liquor is too high, so that the RSSR content in the alkaline liquor needs to be mainly analyzed and controlled during operation, and secondly, the retention time and the aggregation degree of the alkaline liquor liquid phase in the alkaline liquor tail gas separation tank are important factors influencing the quality of the regenerated alkaline liquor.
Disclosure of Invention
The present invention is directed to a liquefied petroleum gas desulfurization apparatus, which solves the above problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a liquefied petroleum gas desulphurization unit, including extraction tower, regenerator column and alkali lye tail gas knockout drum, be connected with the conveyer pipe that is used for carrying alkali lye between extraction tower and the regenerator column, extraction tower bottom is connected with the intake pipe that is used for carrying the liquefied gas, has connected gradually alkali lye admission pipe and regeneration alkali lye discharge pipe between alkali lye tail gas knockout drum bottom and the regenerator column, and the alkali lye admission pipe is arranged in carrying alkali lye tail gas knockout drum with the alkali lye in the regenerator column, still be connected with the back flow between regenerator column and the extraction tower, the back flow is arranged in carrying the extraction tower with the regeneration alkali lye in the regenerator column, and alkali lye tail gas knockout drum bottom one side is connected with the disulfide eduction tube, and the regenerator column bottom is connected with the air admission pipe that is used for transporting air, installs the determine module that is arranged in detecting regeneration alkali lye discharge pipe, installs a plurality of inner member that are used for promoting disulfide gathering and extension disulfide dwell time in the alkali lye tail gas knockout drum (ii) a
The detection assembly comprises a detection box arranged on the regenerated alkali liquor discharge pipe, a detection structure is arranged in the detection box, a controller is arranged on the detection box, the detection structure and the controller are electrically connected, a glass window for observing the detection structure is arranged on the detection box, and a flip door is hinged to the detection box.
As preferred technical scheme in this application, it includes the vertical extraction bottle of installing inside the detection box to detect the structure, be connected with the connecting pipe on the regenerated lye discharge pipe, the connecting pipe top is located extraction bottle top open-ended top department, first solenoid valve and first flowmeter are installed in proper order to connecting pipe bottom department, be equipped with the liquid bottle of depositing on the detection box, it is connected with the bottom tube to deposit between liquid bottle bottom and the extraction bottle top, install second control valve and second flowmeter on the bottom tube in proper order, the receiving cylinder has been placed to the detection box bottom, the receiving cylinder is located under the extraction bottle, the valve body is installed to extraction bottle bottom drain pipe department, the receiving cylinder inner wall is hugged closely to the drain pipe of extraction bottle bottom, extraction bottle back is connected with the raceway that is used for the water delivery, first solenoid valve, first flowmeter, second solenoid valve and second flowmeter all with between the controller electric connection.
As the preferred technical scheme in this application, the internals includes a plurality of vertical first aggregation boards and the second aggregation board of installing in alkali lye tail gas knockout drum, first aggregation board and second aggregation board symmetry set up, first aggregation board and the second aggregation board that corresponds constitute the V template, and all set up the gathering hole that supplies the disulfide business turn over on first aggregation board and the second aggregation board, the internals still includes a plurality of first V template and the second V template that set up horizontally, first V template and second V template symmetry set up, be formed with a plurality of gathering holes that supply the disulfide business turn over between first V template, second V template, first aggregation board and the second aggregation board, all fill in gathering hole and the gathering hole and using anthracite filler.
According to the preferred technical scheme, the liquefied petroleum gas desulfurization device comprises a first V-shaped plate and a second V-shaped plate which are arranged between gathering holes, wherein the first V-shaped plate and the second V-shaped plate are arranged at equal intervals according to the distance between the gathering holes.
As preferred technical scheme in this application, other tail gas absorption tower and the rectifying column of having set gradually of regenerator column, disulfide eduction tube one end is connected with the tail gas absorption tower, is connected with the pipeline between tail gas absorption tower and the rectifying column, and rectifying column top and bottom are connected with disulfide discharge pipe and absorbent discharge pipe respectively, are connected with the tail gas discharge pipe between regenerator column top and the tail gas absorption tower.
As the preferred technical scheme in this application, alkali lye tail gas knockout drum one side is provided with the fan, is connected with the air-supply line between fan and the alkali lye tail gas knockout drum, still installs the temperature controller that is used for the intensification on the alkali lye tail gas knockout drum.
As the preferable technical scheme in the application, the conveying pipe is provided with a heater, and the heater is used for heating the alkali liquor inlet water in the conveying pipe.
As the preferable technical scheme in this application according to claim one kind liquefied petroleum gas desulphurization unit, alkali lye tail gas separation tank bottom is connected with the row's cinder notch that is used for arranging the sediment, and alkali lye tail gas separation tank top is connected with the connector, and alkali lye admission pipe one end is fixed on the connector.
Compared with the prior art, the invention has the beneficial effects that:
(1) the liquefied petroleum gas desulfurization device can simply and effectively measure the RSSR content in the alkali liquor by using the detection assembly, the measurement process is simple and convenient, and the control index of the regeneration process is conveniently and flexibly adjusted, so that the quality of the regenerated alkali liquor can be ensured, and the alkaline catalyst solution is not easy to lose efficacy.
(2) This liquefied petroleum gas desulphurization unit, utilize a plurality of internals, can promote the gathering of disulfide and the dwell time of extension disulfide, the gathering hole that forms is the V die cavity with compiling the hole, regeneration alkali liquor is passing the gathering hole and is being prolonged with the time of compiling the hole like this, thereby make dwell time longer, in addition, gather and all fill in hole and the gathering hole and use anthracite filler, anthracite filler aggregate layer can accelerate the gathering separation of liquid drop, thereby can make total sulfur concentration can control at lower level in the regeneration alkali liquor, in addition, when RSSR content is higher in detecting component detects out alkali liquor, can adjust the quality of regeneration alkali liquor through the quantity that increases the internals, both cooperation result of use are better.
(3) This liquefied petroleum gas desulphurization unit through mutually supporting of the tail gas absorption tower that sets up and rectifying column, can effectually handle tail gas, adopts kerosene or diesel oil as the RSSR in the absorbent absorption gas phase in the tail gas absorption tower, recycles the difference of RSSR and absorbent volatility, then separates RSSR and absorbent in the rectifying column, obtains the RSSR of liquid phase to realize sulphur resource recycle.
Drawings
FIG. 1 is a schematic perspective view of the desulfurization apparatus of the present invention;
FIG. 2 is a schematic perspective view of the lye tail gas separation tank and the detection assembly of the present invention;
FIG. 3 is a schematic view of a first perspective structure of the detecting assembly of the present invention;
FIG. 4 is a schematic diagram of a second perspective structure of the detecting assembly of the present invention;
FIG. 5 is a schematic perspective view of a detection structure according to the present invention;
FIG. 6 is a perspective view of the inner member of the present invention;
FIG. 7 is an enlarged view of part A of the present invention;
fig. 8 is a schematic perspective structure view of the first V-shaped plate and the second V-shaped plate of the present invention.
In the figure: 1. an extraction column; 101. an air inlet pipe; 102. a delivery pipe; 103. a return pipe; 2. a heater; 3. a regeneration tower; 301. a tail gas discharge pipe; 302. an air inlet pipe; 4. a tail gas absorption tower; 5. a rectifying tower; 501. a disulfide discharge pipe; 6. an alkali liquor tail gas separation tank; 601. a pipe connector; 602. alkali liquor enters the tube; 603. a regenerated alkali liquor discharge pipe; 604. a disulfide delivery line; 605. a temperature controller; 606. an air inlet pipe; 607. a fan; 608. a slag discharge port; 7. a detection component; 701. a detection cartridge; 702. a flip door; 703. a controller; 704. a glass window; 8. an extraction bottle; 801. a receiving drum; 802. a connecting pipe; 803. a first flow meter; 804. a first solenoid valve; 805. a liquid storage bottle; 806. a bottom tube; 807. a second flow meter; 9. an inner member; 901. a first V-shaped plate; 902. a second V-shaped plate; 903. a first collector plate; 904. a second aggregation plate; 905. a focus bore; 906. wells were pooled.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Further, it will be appreciated that the dimensions of the various elements shown in the figures are not drawn to scale, for ease of description, and that the thickness or width of some layers may be exaggerated relative to other layers, for example.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined or illustrated in one figure, it will not need to be further discussed or illustrated in detail in the description of the following figure.
As shown in fig. 1 to 8, the present invention provides a technical solution: a liquefied petroleum gas desulfurization device comprises an extraction tower 1, a regeneration tower 3 and an alkali liquor tail gas separation tank 6, wherein a conveying pipe 102 for conveying alkali liquor is connected between the extraction tower 1 and the regeneration tower 3, the bottom of the extraction tower 1 is connected with an air inlet pipe 101, the air inlet pipe 101 is used for conveying liquefied petroleum gas, an alkali liquor inlet pipe 602 and a regenerated alkali liquor discharge pipe 603 are sequentially connected between the bottom of the alkali liquor tail gas separation tank 6 and the regeneration tower 3, the alkali liquor inlet pipe 602 is used for conveying alkali liquor in the regeneration tower 3 into the alkali liquor tail gas separation tank 6, the regenerated alkali liquor discharge pipe 603 is used for conveying regenerated alkali liquor in the alkali liquor tail gas separation tank 6 into the regeneration tower 3, a return pipe 103 is further connected between the regeneration tower 3 and the extraction tower 1, the return pipe 103 is used for conveying regenerated alkali liquor in the regeneration tower 3 into the extraction tower 1, one side of the bottom of the alkali liquor tail gas separation tank 6 is connected with a disulfide discharge pipe 604, the bottom of the regeneration tower 3 is connected with an air inlet pipe 302 for conveying air, a detection assembly 7 is mounted on a regenerated alkali liquor discharge pipe 603, the detection assembly 7 is used for detecting the content of disulfide in regenerated alkali liquor, a plurality of internal components 9 are mounted in an alkali liquor tail gas separation tank 6, and the internal components 9 are used for promoting the aggregation of disulfide and prolonging the retention time of disulfide;
the detection component 7 comprises a detection box 701 arranged on the regenerated alkali liquor discharge pipe 603, a detection structure is arranged in the detection box 701, a controller 703 is arranged on the detection box 701, the detection structure is electrically connected with the controller 703, the detection box 701 is provided with a glass window 704 for observing the detection structure, and a flip door 702 is hinged on the detection box 701.
It should be noted that, from the principle of the Merox mercaptan removal process, the regeneration process is to oxidize sodium mercaptide to recover the NaOH concentration in the alkali solution and separate the generated RSSR from the alkali solution, so as to achieve the purpose of recycling the extracted alkali solution. Therefore, the control indexes of the quality of the regenerated alkali liquor comprise: NaOH concentration, cobalt catalyst activity, and RSSR content in the lye. Sodium mercaptide is formed after mercaptan is extracted by NaOH alkali liquor, and is equivalent to weak acid strong alkali salt, and the sodium mercaptide is considered to be NaOH by adopting acid-base titration analysis when the concentration of NaOH in the alkali liquor is analyzed. Namely, sodium mercaptide in the alkali liquor is not completely regenerated and converted into RSSR, so that the concentration of NaOH in the actual effective alkali liquor is lower than that of the data analyzed by the assay. Therefore, the concentration of NaOH in the alkali liquor is difficult to detect. The activity of the cobalt catalyst and the RSSR content in the alkali liquor are not easy to be measured in industrial production. According to production experience, the reason for the failure of the alkaline catalyst solution in the conventional regeneration process is mainly that the RSSR content in the alkaline solution is too high. Therefore, the analysis and control of the RSSR content in the alkali liquor are important in operation, and the RSSR analysis method in the alkali liquor is established, so that the detection component 7 is used for the purpose of setting the detection component 7, and the RSSR content in the alkali liquor can be rapidly calculated by utilizing the detection component 7.
The specific steps are that the controller 703 opens the first electromagnetic valve 804 at the connecting pipe 802, a small amount of regenerated alkali liquor enters the extraction flask 8 through the connecting pipe 802, then the first electromagnetic valve 804 is closed, and the first flow meter 803 detects the content of the regenerated alkali liquor entering the extraction flask 8, it should be noted that the first flow meter 803 detects the flow rate of the regenerated alkali liquor in real time, so as to obtain the amount of the regenerated alkali liquor entering the extraction flask 8 according to the flow rate, which is the prior art, and therefore, the explanation is not repeated. The content value is transmitted to the controller 703 in real time, a worker feeds water into the extraction bottle 8 through a water feeding pipe according to the content of the regenerated alkali liquor, so that the regenerated alkali liquor is diluted by 3-5 times to reduce the viscosity of the regenerated alkali liquor, then the controller 703 opens the second electromagnetic valve on the bottom pipe 806, the n-heptane solvent in the liquid storage bottle 805 flows into the extraction bottle 8 and is mixed with the regenerated alkali liquor, the n-heptane solvent extracts the RSSR in the regenerated alkali liquor, then the valve body at the bottom of the extraction bottle 8 is opened to make the extracted RSSR flow into the receiving cylinder 801, the worker can observe the extraction condition and the flow condition of the extracted RSSR through the glass window 704, so that the valve body is closed timely, and then the receiving cylinder 801 is taken out for content analysis, so that the content of the RSSR in the alkali liquor can be calculated. It should be noted that the first electromagnetic valve 804, the first flowmeter 803, the second electromagnetic valve, and the second flowmeter 807 are all electrically connected to the controller 703, so that the controller 703 can control the operations of the first electromagnetic valve 804, the first flowmeter 803, the second electromagnetic valve, and the second flowmeter 807, and how the controller 703 controls the first electromagnetic valve 804, the first flowmeter 803, the second electromagnetic valve, and the second flowmeter 807 is the prior art, and therefore, detailed description is omitted.
As a specific embodiment, the detection structure comprises an extraction flask 8 vertically installed inside the detection box 701, a connection pipe 802 is connected to the regenerated alkaline solution discharge pipe 603, and the top end of the connection pipe 802 is located above the opening at the top end of the extraction flask 8. It should be noted that the top of the extraction flask 8 is provided with a hole, and the regenerated alkali liquid in the connection pipe 802 enters the extraction flask 8 through the hole at the top of the extraction flask 8. First solenoid valve 804 and first flowmeter 803 are installed in proper order to connecting pipe 802 bottom department, be equipped with on the detection box 701 and deposit liquid bottle 805, it is connected with bottom tube 806 to deposit between liquid bottle 805 bottom and the 8 tops of extraction bottle, install second control valve and second flowmeter 807 on the bottom tube 806 in proper order, a receiving cylinder 801 has been placed to detection box 701 bottom, receiving cylinder 801 is located extraction bottle 8 under, the valve body is installed to extraction bottle 8 bottom drain pipe department, the drain pipe of extraction bottle 8 bottom hugs closely receiving cylinder 801 inner wall, extraction bottle 8 back is connected with the raceway that is used for the water delivery.
It should be noted that the retention time and the aggregation degree of the lye liquid phase in the lye tail gas separation tank 6 are important factors influencing the quality of the regenerated lye. In the conventional alkali liquor regeneration process base, such as the Thiolexsm process of Merichem company, the process flow of 'back extraction' of RSSR in the regenerated alkali liquor by using solvent oil enables the total sulfur concentration in the regenerated alkali liquor to be controlled at a lower level. However, the process has the problem of high equipment investment, and for this purpose, the internal member 9 is arranged to increase the retention time and the aggregation degree of the lye liquid phase, so that the total sulfur concentration in the regenerated lye can be controlled at a lower level.
The specific principle is that the first aggregation plate 903, the second aggregation plate 904, the first V-shaped plate 901 and the second V-shaped plate 902 are all V-shaped structures, so that the formed aggregation holes 905 and the aggregation holes 906 are V-shaped cavities, the time of the regenerated alkali liquor passing through the aggregation holes 905 and the aggregation holes 906 is prolonged, the residence time is long, in addition, anthracite fillers are filled in the aggregation holes 906 and the aggregation holes 905, the aggregation layer of the anthracite fillers can accelerate the aggregation and separation of liquid drops, and the total sulfur concentration in the regenerated alkali liquor can be controlled at a low level. It should be noted that the first collecting plate 903 and the second collecting plate 904 are both composed of inclined plates, and the two inclined plates form a V-shaped plate.
As a specific embodiment, the inner member 9 comprises a plurality of first aggregation plates 903 and second aggregation plates 904 vertically installed in the alkali lye tail gas separation tank 6, the first aggregation plates 903 and the second aggregation plates 904 are symmetrically arranged, the first aggregation plates 903 and the corresponding second aggregation plates 904 form V-shaped plates, aggregation holes 905 for the disulfide to enter and exit are formed in the first aggregation plates 903 and the second aggregation plates 904, the inner member 9 further comprises a plurality of first V-shaped plates 901 and second V-shaped plates 902 which are horizontally arranged, the first V-shaped plates 901 and the second V-shaped plates 902 are symmetrically arranged, a plurality of aggregation holes 906 for the disulfide to enter and exit are formed between the first V-shaped plates 901, the second V-shaped plates 902, the first aggregation plates 903 and the second aggregation plates 904, anthracite filler is filled in the aggregation holes 906 and the aggregation holes 905, the first V-shaped plates 901 and the second V-shaped plates 902 are arranged between the aggregation holes 905, the first chevron 901 and the second chevron 902 are disposed equidistantly according to the distance between the gathering holes 905. It should be noted that the first V-shaped plate 901, the second V-shaped plate 902, the first aggregation plate 903 and the second aggregation plate 904 are all made of stainless steel, specifically, austenite-ferrite duplex stainless steel is adopted, which has the advantages of both austenite and ferrite stainless steel, compared with ferrite, the toughness and the ductility are higher, the room temperature brittleness is avoided, the intergranular corrosion resistance and the welding performance are both significantly improved, and compared with austenite stainless steel, the strength is high, and the intergranular corrosion resistance and the chloride stress corrosion resistance are significantly improved. Has excellent pitting corrosion resistance and thus long service life.
As a specific embodiment, a tail gas absorption tower 4 and a rectification tower 5 are sequentially arranged beside a regeneration tower 3, one end of a disulfide delivery pipe 604 is connected with the tail gas absorption tower 4, a pipeline is connected between the tail gas absorption tower 4 and the rectification tower 5, the top end and the bottom end of the rectification tower 5 are respectively connected with a disulfide discharge pipe 501 and an absorbent discharge pipe, and a tail gas discharge pipe 301 is connected between the top of the regeneration tower 3 and the tail gas absorption tower 4.
It should be noted that in the conventional process, the tail gas discharged from the top of the regeneration tower 3 is generally discharged, but RSSR in the tail gas is also an organic sulfur resource. In the embodiment, kerosene or diesel oil is used as an absorbent to absorb RSSR in a gas phase, and the RSSR and the absorbent are separated in the rectifying tower 5 by using the difference between the volatility of the RSSR and the absorbent to obtain a liquid-phase RSSR, and the specific steps include that the tail gas at the top of the regeneration tower 3 enters the tail gas absorption tower 4 through the tail gas discharge pipe 301, the kerosene in the gas phase is absorbed by the kerosene in the tail gas absorption tower 4, then the kerosene and the RSSR are conveyed to the rectifying tower 5, then the volatility of the RSSR and the volatility of the kerosene are different, so that the rectifying tower 5 can separate the RSSR and the kerosene absorbent, then the liquid-phase RSSR is discharged through the disulfide discharge pipe 501, and the absorbent discharge pipe is further connected to the rectifying tower 5 to discharge the kerosene absorbent.
As a specific embodiment, a fan 607 is arranged on one side of the alkali liquor tail gas separation tank 6, an air inlet pipe 606 is connected between the fan 607 and the alkali liquor tail gas separation tank 6, a temperature controller 605 for heating is further installed on the alkali liquor tail gas separation tank 6, a heater 2 is installed on the conveying pipe 102, and the heater 2 is used for heating the alkali liquor inlet water in the conveying pipe 102. It should be noted that the separation of RSSR from the alkali solution can be effectively accelerated by increasing the air injection amount and raising the temperature, so that the fan 607 and the temperature controller 605 are provided in this embodiment, thereby conveniently and flexibly adjusting the air injection amount and the temperature. Specifically, the regeneration temperature of the alkali liquor can be increased from 40 ℃ to 50-58 ℃, and the air injection flow is increased from 20m3Increase in h to 42m3H is used as the reference value. The accumulation speed of the RSSR concentration in the adjusted alkali liquor is reduced, and the proportion of the RSSR generated in the regeneration process from the liquid phase to the tail gas is increased.
As a specific example, the bottom of the alkali liquor tail gas separation tank 6 is connected with a slag discharge port 608 for discharging slag, the top of the alkali liquor tail gas separation tank 6 is connected with a connector 601, and one end of an alkali liquor inlet pipe 602 is fixed on the connector 601. It should be noted that the slag discharge opening 608 and the pipe connector 601 are prior art and therefore will not be described in detail.
Particularly, liquefied petroleum gas and alkaline catalyst solution are extracted in a reaction tower in a counter-current manner, mercaptan reacts with alkali to generate sodium mercaptan and is transferred to an alkaline phase, the sodium mercaptan and the alkaline catalyst solution enter an oxidation tower and are oxidized into disulfide after reacting with air, so that the removal of the mercaptan is realized, then liquefied petroleum gas is washed by alcohol amine in advance and then is subjected to pre-alkaline washing to remove residual hydrogen sulfide, the liquefied petroleum gas after the alkaline washing enters an extraction tower 1, the steps are the prior art, the liquefied petroleum gas entering the extraction tower 1 is in counter-current contact with alkaline liquor containing catalyst, the mercaptan reacts with the sodium hydroxide to generate mercaptan ions which are dissolved in the alkaline liquor and are extracted to a water phase, the mercaptan ions are discharged from the bottom of the tower, the alkaline catalyst solution discharged from the bottom of the tower is heated to enter a regeneration tower 3, the mercaptan ions are oxidized into the disulfide under the action of the catalyst and the air to realize the removal of the mercaptan, and the alkaline catalyst solution is returned to the extraction tower 1 for recycling after being regenerated in an alkaline tail gas separation tank 6, the extracted liquefied gas is settled and washed with water to obtain a refined liquefied gas, wherein the alkaline catalyst solution refers to an alkaline solution containing a catalyst, and the common alkaline solutions include a sodium hydroxide solution, a potassium hydroxide solution, an ammonium hydroxide solution, a sodium carbonate solution, a sodium phosphate solution, a sodium orthosilicate solution and a sodium silicate solution, while the sodium hydroxide solution containing a catalyst is used in the embodiment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a liquefied petroleum gas desulphurization unit, including extraction tower (1), regenerator column (3) and alkali lye tail gas knockout drum (6), be connected with between extraction tower (1) and regenerator column (3) and be used for carrying conveyer pipe (102) of alkali lye, extraction tower (1) bottom is connected with intake pipe (101) that are used for carrying the liquefied gas, alkali lye tail gas knockout drum (6) bottom and regenerator column (3) between have connected gradually alkali lye admission pipe (602) and regeneration alkali lye discharge pipe (603), alkali lye admission pipe (602) are arranged in carrying alkali lye tail gas knockout drum (6) with the alkali lye in regenerator column (3), its characterized in that: a return pipe (103) is connected between the regeneration tower (3) and the extraction tower (1), the return pipe (103) is used for conveying regenerated alkali liquor in the regeneration tower (3) into the extraction tower (1), one side of the bottom of the alkali liquor tail gas separation tank (6) is connected with a disulfide eduction pipe (604), the bottom of the regeneration tower (3) is connected with an air inlet pipe (302) used for conveying air, a detection assembly (7) used for detecting the content of disulfide in the regenerated alkali liquor is installed on a regenerated alkali liquor discharge pipe (603), and a plurality of internal components (9) used for promoting the aggregation of disulfide and prolonging the retention time of the disulfide are installed in the alkali liquor tail gas separation tank (6);
the detection assembly (7) comprises a detection box (701) arranged on the regenerated alkali liquor discharge pipe (603), a detection structure is arranged in the detection box (701), a controller (703) is arranged on the detection box (701), the detection structure is electrically connected with the controller (703), a glass window (704) for observing the detection structure is arranged on the detection box (701), and a flip door (702) is hinged on the detection box (701);
the inner member (9) comprises a plurality of first aggregation plates (903) and second aggregation plates (904) which are vertically arranged in the alkali liquor tail gas separation tank (6), the first aggregation plates (903) and the second aggregation plates (904) are symmetrically arranged, the first aggregation plates (903) and the corresponding second aggregation plates (904) form a V-shaped plate, and gather on board (903) and the second board (904) all set up the gathering hole (905) that supplies the disulfide business turn over, interior component (9) still include first V template (901) and second V template (902) of a plurality of horizontal settings, first V template (901) and second V template (902) symmetry setting, be formed with a plurality of gathering holes (906) that supply the disulfide business turn over between first V template (901), second V template (902), first gathering board (903) and second gathering board (904), gather in hole (906) and gathering hole (905) all to fill with anthracite filler.
2. The liquefied petroleum gas desulfurization apparatus according to claim 1, wherein: the detection structure comprises an extraction bottle (8) vertically arranged in a detection box (701), a connecting pipe (802) is connected to a regenerated alkali liquor discharge pipe (603), the top end of the connecting pipe (802) is positioned above an opening at the top end of the extraction bottle (8), a first electromagnetic valve (804) and a first flowmeter (803) are sequentially arranged at the bottom end of the connecting pipe (802), a liquid storage bottle (805) is arranged on the detection box (701), a bottom pipe (806) is connected between the bottom of the liquid storage bottle (805) and the top of the extraction bottle (8), a second control valve and a second flowmeter (807) are sequentially arranged on the bottom pipe (806), a receiving barrel (801) is arranged at the bottom of the detection box (701), the receiving barrel (801) is positioned under the extraction bottle (8), a valve body is arranged at a liquid outlet pipe at the bottom of the extraction bottle (8), the inner wall of the liquid outlet pipe receiving barrel (801) at the bottom of the extraction bottle (8), a water delivery pipe for delivering water is tightly attached to the back of the extraction bottle (8), the first electromagnetic valve (804), the first flow meter (803), the second electromagnetic valve and the second flow meter (807) are all electrically connected with the controller (703).
3. The liquefied petroleum gas desulfurization apparatus according to claim 1, wherein: the first V-shaped plate (901) and the second V-shaped plate (902) are arranged between the gathering holes (905), and the first V-shaped plate (901) and the second V-shaped plate (902) are arranged at equal intervals according to the distance between the gathering holes (905).
4. The liquefied petroleum gas desulfurization apparatus according to claim 1, wherein: the device is characterized in that a tail gas absorption tower (4) and a rectifying tower (5) are sequentially arranged beside the regeneration tower (3), one end of a disulfide guide pipe (604) is connected with the tail gas absorption tower (4), a pipeline is connected between the tail gas absorption tower (4) and the rectifying tower (5), the top end and the bottom end of the rectifying tower (5) are respectively connected with a disulfide discharge pipe (501) and an absorbent discharge pipe, and a tail gas discharge pipe (301) is connected between the top of the regeneration tower (3) and the tail gas absorption tower (4).
5. The liquefied petroleum gas desulfurization apparatus according to claim 1, wherein: a fan (607) is arranged on one side of the alkali liquor tail gas separation tank (6), an air inlet pipe (606) is connected between the fan (607) and the alkali liquor tail gas separation tank (6), and a temperature controller (605) for heating is further installed on the alkali liquor tail gas separation tank (6).
6. The liquefied petroleum gas desulfurization apparatus according to claim 1, wherein: the heater (2) is installed on the conveying pipe (102), and the heater (2) is used for heating the alkali liquor in the conveying pipe (102).
7. The apparatus for desulfurizing a liquefied petroleum gas according to claim 5, wherein: the bottom of the alkali liquor tail gas separation tank (6) is connected with a slag discharge port (608) for discharging slag, the top of the alkali liquor tail gas separation tank (6) is connected with a pipe connector (601), and one end of an alkali liquor inlet pipe (602) is fixed on the pipe connector (601).
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| CN103232855A (en) * | 2013-05-07 | 2013-08-07 | 中海油（青岛）重质油加工工程技术研究中心有限公司 | Process of removing hydrogen sulfide in petroleum light hydrocarbon |
| CN106526208A (en) * | 2016-10-26 | 2017-03-22 | 上海昂林科学仪器有限公司 | Flow path device and online oil content analyzer with same |
| CN109929583A (en) * | 2019-03-21 | 2019-06-25 | 宁波章甫能源科技有限公司 | A kind of device and method of the liquid hydrocarbon mercaptan removal alkali liquid regeneration of tail gas zero-emission |
| CN112980498A (en) * | 2021-02-03 | 2021-06-18 | 宁波章甫能源科技有限公司 | Method and device for efficiently oxidizing sweetening alkali liquor and recovering disulfide |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3602268B2 (en) * | 1996-07-15 | 2004-12-15 | 日揮株式会社 | Method and apparatus for removing sulfur compounds contained in natural gas and the like |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103232855A (en) * | 2013-05-07 | 2013-08-07 | 中海油（青岛）重质油加工工程技术研究中心有限公司 | Process of removing hydrogen sulfide in petroleum light hydrocarbon |
| CN106526208A (en) * | 2016-10-26 | 2017-03-22 | 上海昂林科学仪器有限公司 | Flow path device and online oil content analyzer with same |
| CN109929583A (en) * | 2019-03-21 | 2019-06-25 | 宁波章甫能源科技有限公司 | A kind of device and method of the liquid hydrocarbon mercaptan removal alkali liquid regeneration of tail gas zero-emission |
| CN112980498A (en) * | 2021-02-03 | 2021-06-18 | 宁波章甫能源科技有限公司 | Method and device for efficiently oxidizing sweetening alkali liquor and recovering disulfide |
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