Diesel oil dehydration device

Abstract

The utility model relates to the technical field of diesel oil dehydration, in particular to a diesel oil dehydration device. The diesel oil dehydration device comprises a hydrofining reactor, a hydrocracking reactor, a fractionating tower, a diesel oil stripping tower, a stabilizing tower, a deoxygenated water heat exchanger, an air cooler, a low-temperature water cooler, a filter and a coalescer which are communicated in sequence. The low-temperature water cooler is additionally arranged to form a low-temperature refrigerant to reduce the diesel oil temperature, dissolved water is converted into free water, the water-oil separation efficiency is improved, and the purpose of reducing total water is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to diesel oil dehydration technical field, especially a diesel oil dehydration device. BACKGROUND

[0002] The diesel oil dehydration device mainly relates to the water removal problem in the diesel oil processing process. Diesel oil is a light petroleum product composed of complex hydrocarbon mixtures, and is usually used as fuel for diesel engines. In the processing of diesel oil, water vapor may be used for stripping, resulting in a small amount of water carried in the diesel oil. The presence of these water not only affects the appearance and use effect of diesel oil, but also may damage the equipment using diesel oil.

[0003] In the prior art, diesel oil dehydration mainly uses a two-stage vacuum drying tower for vacuum dehydration, but this method has problems such as complex process flow, high running cost, and large noise during dehydration. In addition, there are dehydration methods through filters, electric coalescers, and coalescence filter dehydrators, but the diesel oil obtained by this method has a high water content, especially in winter, water is easily precipitated, resulting in turbid appearance of the product, which cannot meet the requirements of customers. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a diesel oil dehydration device, which reduces the temperature of diesel oil by increasing low-temperature refrigerant, converts dissolved water into free water, improves the water-oil separation efficiency, and achieves the purpose of reducing total water, so as to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a diesel oil dehydration device, which comprises a hydrogenation refining reactor, a hydrogenation cracking reactor, a fractionating column, a diesel oil stripping tower, a desorption tower bottom reboiler, an oxygen removal water heat exchanger, an air cooler, a low-temperature water cooler, a filter, and a coalescer which are sequentially connected.

[0006] In some embodiments of the utility model, the hydrogenation refining reactor comprises a vacuum gas oil inlet and a hydrogenation refining reactor outlet.

[0007] In some embodiments of the utility model, the hydrogenation cracking reactor comprises a hydrogenation cracking reactor inlet and an oil outlet, and the hydrogenation cracking reactor inlet and the hydrogenation refining reactor outlet are communicated.

[0008] In some embodiments of the utility model, the fractionating column comprises an oil inlet, a naphtha outlet, an aviation kerosene outlet, a tail oil outlet, and a first diesel oil outlet, and the oil inlet and the oil outlet are communicated.

[0009] In some embodiments of the utility model, the diesel oil stripping tower includes first diesel oil import, stripping steam import and second diesel oil export, first diesel oil import with first diesel oil export intercommunication.

[0010] In some embodiments of the utility model, the desorption tower bottom reboiler includes desorption tower bottom reboiler import and desorption tower bottom reboiler export, desorption tower bottom reboiler import with second diesel oil export intercommunication.

[0011] In some embodiments of the utility model, the deoxygenated water heat exchanger includes deoxygenated water heat exchanger import and deoxygenated water heat exchanger export, deoxygenated water heat exchanger import with desorption tower bottom reboiler export intercommunication.

[0012] In some embodiments of the utility model, the air cooler includes air cooling import and air cooling export, air cooling import with deoxygenated water heat exchanger export intercommunication.

[0013] In some embodiments of the utility model, the low temperature water cooler includes low temperature water cooling import and low temperature water cooling export, low temperature water cooling import with air cooling export intercommunication.

[0014] In some embodiments of the utility model, the filter includes filter import and filter export, filter import with low temperature water cooling export intercommunication, and the coalescer includes coalescer import and coalescer export, coalescer import with filter export intercommunication.

[0015] The utility model has the advantages of:

[0016] The present application reduces the temperature of diesel oil by adding a low temperature water cooler to form low temperature refrigerant, converts dissolved water into free water, improves the water-oil separation efficiency, and achieves the purpose of reducing total water. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure schematic view of the diesel oil dehydration device is shown.

[0018] Element number explanation:

[0019] 1 hydrofining reactor

[0020] 101 vacuum gas oil import

[0021] 102 hydrofining reactor export

[0022] 2 hydrocracking reactor

[0023] 201 hydrocracking reactor import

[0024] 202 oil export

[0025] 3 fractionation column

[0026] 301 oil inlet

[0027] 302 naphtha outlet

[0028] 303 jet fuel outlet

[0029] 304 tail oil outlet

[0030] 305 first diesel outlet

[0031] 4 diesel stripper column

[0032] 401 first diesel inlet

[0033] 402 stripping steam inlet

[0034] 403 second diesel outlet

[0035] 5 desorption column bottoms reboiler

[0036] 501 desorption column bottoms reboiler inlet

[0037] 502 desorption column bottoms reboiler outlet

[0038] 6 deaerated water heat exchanger

[0039] 601 deaerated water heat exchanger inlet

[0040] 602 deaerated water heat exchanger outlet

[0041] 7 air cooler

[0042] 701 air cooler inlet

[0043] 702 air cooler outlet

[0044] 8 cryogenic water cooler

[0045] 801 cryogenic water cooler inlet

[0046] 802 cryogenic water cooler outlet

[0047] 9 filter

[0048] 901 filter inlet

[0049] 902 filter outlet

[0050] 10 coalescer

[0051] 1001 coalescer inlet

[0052] 1002 coalescer outlet DETAILED DESCRIPTION

[0053] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not a limitation on the present application.

[0054] The terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0057] Referring to Figure 1 , the present application provides a diesel oil dewatering device, which comprises a hydrogenation refining reactor 1, a hydrogenation cracking reactor 2, a fractionating column 3, a diesel oil stripping tower 4, a desorption tower bottom reboiler 5, an oxygen removal water heat exchanger 6, an air cooler 7, a low-temperature water cooler 8, a filter 9 and a coalescer 10 which are sequentially communicated. In actual production, vacuum gas oil is used as raw material, and after hydrogenation refining in the hydrogenation refining reactor 1 and hydrogenation cracking reaction in the hydrogenation cracking reactor 2, the reaction oil enters the fractionating column 3, wherein the diesel oil component enters the diesel oil stripping tower 4, and after removing the light components by steam stripping, the diesel oil is discharged from the bottom of the diesel oil stripping tower 4, then enters the desorption tower bottom reboiler 5, and after heat exchange with oxygen removal water in the oxygen removal water heat exchanger 6, the diesel oil is cooled by the air cooler 7, and then enters the filter 9 and the coalescer 10 for impurity removal and dewatering after being cooled by the low-temperature water cooler 8. Finally, the diesel oil is sent out as vehicle diesel oil or #5 industrial white oil.

[0058] The hydrogenation cracking reactor 2 comprises a hydrogenation cracking reactor inlet 201 and an oil outlet 202, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor 1 are communicated, and specifically, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor outlet 102 are communicated.

[0059] The hydrogenation cracking reactor 2 comprises a hydrogenation cracking reactor inlet 201 and an oil outlet 202, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor 1 are communicated, and specifically, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor outlet 102 are communicated.

[0060] The hydrogenation cracking reactor 2 comprises a hydrogenation cracking reactor inlet 201 and an oil outlet 202, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor 1 are communicated, and specifically, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor outlet 102 are communicated.

[0061] The hydrogenation cracking reactor 2 comprises a hydrogenation cracking reactor inlet 201 and an oil outlet 202, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor 1 are communicated, and specifically, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor outlet 102 are communicated.

[0062] The hydrogenation cracking reactor 2 comprises a hydrogenation cracking reactor inlet 201 and an oil outlet 202, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor 1 are communicated, and specifically, the hydrogenation cracking reactor inlet 201 and the hydrogenation refining reactor outlet 102 are communicated.

[0063] The diesel dehydrating device provided by the embodiment of the utility model, the oxygen-removing water heat exchanger 6 includes oxygen-removing water heat exchanger import 601 and oxygen-removing water heat exchanger export 602, the oxygen-removing water heat exchanger import 601 is linked with the desorption tower bottom reboiler 5, specifically, the oxygen-removing water heat exchanger import 601 is linked with the desorption tower bottom reboiler export 502.

[0064] The diesel dehydrating device provided by the embodiment of the utility model, the air cooler 7 includes air cooler import 701 and air cooler export 702, the air cooler import 701 is linked with the oxygen-removing water heat exchanger 6, specifically, the air cooler import 701 is linked with the oxygen-removing water heat exchanger export 602.

[0065] The diesel dehydrating device provided by the embodiment of the utility model, the low-temperature water cooler 8 includes low-temperature water cooler import 801 and low-temperature water cooler export 802, the low-temperature water cooler import 801 is linked with the air cooler 7, specifically, the low-temperature water cooler import 801 is linked with the air cooler export 702.

[0066] Because the diesel oil from the diesel stripping tower 4 is high-temperature diesel oil, the dissolved water of the high-temperature diesel oil can reach 500ppm, the dissolved water is precipitated after the temperature is reduced, and the free water is removed in the coalescer 10, but because the refrigerant is limited, it is difficult to completely precipitate the dissolved water.

[0067] ①Through the theoretical calculation formula, the water content of the hydrocracking diesel oil product under various process conditions is calculated and compared with the analysis result, and the theoretical calculation formula is optimized; the dissolved amount of water in diesel oil is related to the temperature of diesel oil, and the higher the temperature of diesel oil, the higher the water content.

[0068] The saturated water content of diesel oil under different temperatures is calculated by using the solubility calculation formula of water in pure hydrocarbon and hydrocarbon mixture,

[0069] Lg X = -(4200A + 1050) (1 / T-0.0016)

[0070] In the formula, X is the solubility of water in liquid hydrocarbon mol / mol;

[0071] A is the hydrogen-carbon mass ratio of hydrocarbon;

[0072] T is temperature, K.

[0073] The hydrogen-carbon mass ratio of the device diesel product is 0.1609 according to the calibration data in 2023. When the temperature is 40℃, 313.15K, the value of X calculated by substituting the formula is 0.00174mol / mol, and the average molar mass of diesel oil is 219g / mol, which is converted into a mass ratio of 0.000143, i.e. 143mg / kg; when the temperature is 17℃, 290.15K, the value of X calculated by substituting the formula is 0.00064mol / mol, which is converted into a mass ratio of 0.000053, i.e. 53mg / kg; and when the temperature is 23℃, 296.15K, the value of X calculated by substituting the formula is 0.00084mol / mol, which is converted into a mass ratio of 0.000069, i.e. 69mg / kg.

[0074] It can be obtained from the above formula calculation that the dissolved water is precipitated from diesel oil after the diesel oil is cooled by the analysis center. And it is consistent with the phenomenon that the diesel oil becomes turbid after being cooled by the existing device.

[0075] It is consistent with the turbid appearance of diesel oil after being cooled in the laboratory.

[0076] On this basis, it is necessary to further remove the dissolved water in diesel oil, i.e. a low-temperature water cooler 8 is added to the diesel oil dehydration device to reduce the diesel oil temperature to make the dissolved water precipitate into free water, and the free water is removed in the coalescer 10.

[0077] ②The reason for the high water content in diesel oil is studied, the amount of stripping steam in the fractionating column 3 is tried to be reduced, the rules existing between the changes of the related operation parameters of the fractionating part and the changes of the water content in diesel oil are found out, corresponding measures are formulated to reduce the water content in diesel oil components according to the rules, the free water content in diesel oil is 100mg / kg, and the diesel oil is turbid at present, and the diesel oil product is clear and transparent when the device diesel oil temperature is 40℃, and the diesel oil is turbid when the temperature is reduced to 23℃, which is consistent with the theoretical calculation;

[0078] ③The water-oil separation technology is studied, the technical improvement scheme is proposed according to the present situation of the device, the low-temperature coolant is added to reduce the diesel oil temperature, the dissolved water is converted into free water, the water-oil separation efficiency is improved, and the purpose of reducing the total water is achieved.

[0079] The diesel dewatering device provided by the embodiment of the utility model, the filter 9 includes filter inlet 901 and filter outlet 902, the filter inlet 901 is communicated with the low-temperature water cooler 8, specifically, the filter inlet 901 is communicated with the low-temperature water cooler outlet 802, the coalescer 10 includes coalescer inlet 1001 and coalescer outlet 1002, the coalescer inlet 1001 is communicated with the filter 9, specifically, the coalescer inlet 1001 is communicated with the filter outlet 902.The filter 9 removes the solid impurities and part of the liquid impurities in the diesel oil to ensure the cleanliness of the oil product and improve the oil product quality.The main function of the coalescer 10 (also called coalescing filter or dewaterer) is to remove the water and smaller impurities in the oil.The coalescer 10 is usually used to improve the cleanliness of the oil product and the dewatering efficiency.

[0080] In summary, since the diesel dewatering process is relatively mature in China at present, but the operation conditions are not explored enough, most of the methods for improving the device temperature are used to ensure the appearance qualification. The total water is not removed, if the customer requirement is more stringent, the water content must be measured at low temperature, after cooling, the diesel oil will be turbid. The technical improvement scheme is proposed in combination with the present situation of the device, the water oil separation efficiency is improved by increasing the low-temperature refrigerant to reduce the diesel oil temperature and convert the dissolved water into free water, and the purpose of reducing the total water is achieved.

[0081] In summary, the utility model effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0082] The above embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A diesel fuel dehydration device, characterized in that, The diesel dehydration unit comprises, in sequence, a hydrorefining reactor (1), a hydrocracking reactor (2), a fractionation tower (3), a diesel stripping tower (4), a bottom reboiler of the desorption tower (5), a deoxygenated water heat exchanger (6), an air cooler (7), a low-temperature water cooler (8), a filter (9), and a coalescer (10).

2. The diesel dehydration device as described in claim 1, characterized in that, The hydrorefining reactor (1) includes a vacuum wax oil inlet (101) and a hydrorefining reactor outlet (102).

3. The diesel dehydration device as described in claim 2, characterized in that, The hydrocracking reactor (2) includes a hydrocracking reactor inlet (201) and an oil outlet (202), and the hydrocracking reactor inlet (201) and the hydrorefining reactor outlet (102) are connected.

4. The diesel dehydration device as described in claim 3, characterized in that, The fractionation tower (3) includes an oil inlet (301), a naphtha outlet (302), an aviation kerosene outlet (303), a tail oil outlet (304), and a first diesel outlet (305), wherein the oil inlet (301) and the oil outlet (202) are connected.

5. The diesel dehydration device as described in claim 4, characterized in that, The diesel stripping tower (4) includes a first diesel inlet (401), a stripping steam inlet (402), and a second diesel outlet (403), wherein the first diesel inlet (401) is connected to the first diesel outlet (305).

6. The diesel dehydration device as described in claim 5, characterized in that, The bottom reboiler (5) of the desorption tower includes a bottom reboiler inlet (501) and a bottom reboiler outlet (502), and the bottom reboiler inlet (501) is connected to the second diesel outlet (403).

7. The diesel dehydration device as described in claim 6, characterized in that, The deoxygenated water heat exchanger (6) includes a deoxygenated water heat exchanger inlet (601) and a deoxygenated water heat exchanger outlet (602), and the deoxygenated water heat exchanger inlet (601) is connected to the reboiler outlet (502) at the bottom of the desorption tower.

8. The diesel dehydration device as described in claim 7, characterized in that, The air cooler (7) includes an air cooler inlet (701) and an air cooler outlet (702), and the air cooler inlet (701) is connected to the outlet (602) of the deoxygenated water heat exchanger.

9. The diesel dehydration device as described in claim 8, characterized in that, The low-temperature water cooler (8) includes a low-temperature water cooling inlet (801) and a low-temperature water cooling outlet (802), and the low-temperature water cooling inlet (801) is connected to the air cooling outlet (702).

10. The diesel dehydration device as described in claim 9, characterized in that, The filter (9) includes a filter inlet (901) and a filter outlet (902), the filter inlet (901) being connected to the low-temperature water-cooled outlet (802), and the coalescer (10) includes a coalescer inlet (1001) and a coalescer outlet (1002), the coalescer inlet (1001) being connected to the filter outlet (902).

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