Furfural refining device supporting rapid switching of different raw materials

Abstract

The utility model relates to a furfural refining device supporting quick switching of different raw materials, which comprises a degassing tower, an extraction tower, a flash steam stripping tower, a drying tower and a heating furnace, and is used by combining a first heat exchanger and a first cooler which are arranged in parallel with a second heat exchanger and a second cooler which are arranged in parallel. Different products are alternately produced, the raw material switching process is rapidly completed, the raw material switching time is shortened, the use efficiency of the device is remarkably improved, meanwhile, transition oil is reduced, and cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical production devices, in particular to a furfural refining device which supports rapid switching of different raw materials. Background Art

[0002] Furfural refining unit is one of the key units for producing rubber plasticizers, transformer oil and other products. The unit uses the furfural solvent with strong selectivity but weak solubility to different hydrocarbons in petroleum atmospheric and vacuum distillates. The solubility of polycyclic short-side chain aromatic hydrocarbons and cycloalkanes, colloids, sulfur and nitrogen compounds (all non-ideal components) in furfural is large, and the solubility of polycyclic long-side chain hydrocarbons (ideal components to be enriched) in furfural is small. Based on this property, furfural is fully contacted with the raw oil in the extraction unit to obtain two phases with different densities, so that the non-ideal components dissolved in furfural flow out from the bottom of the extraction unit as extractant (i.e., extracted oil), and the ideal components flow out from the top of the tower as refined liquid. According to the different boiling points of furfural and oil products containing non-ideal components, the recovery of furfural and the separation of extracted oil are achieved through "heating-evaporation".

[0003] Different products can be obtained according to different raw materials and operating conditions: using hydrogenated three-line distillate oil as raw material, furfural refining device can be used to produce rubber plasticizer; using hydrogenated two-line distillate oil as raw material, furfural refining device can be used to produce transformer oil.

[0004] Using a set of furfural refining equipment to alternately produce the above two products can improve the efficiency of the equipment, reduce production costs, and greatly improve economic benefits. However, due to the large differences in the raw materials and operating conditions required to produce different products, using a set of equipment to alternately produce different products has the problem of long switching time and waste of resources. In particular, the production of transformer oil in the processing line 2 has strict requirements on product quality. During the switching and replacement stage of the production plan, due to the long replacement time, a large amount of transition oil will appear when switching from the reduced line 3 to the regular line 2, wasting a large amount of raw materials that can produce high value-added products, greatly reducing the comprehensive output rate of high value-added products, and affecting the economic benefits of the entire device.

[0005] Therefore, under existing technical conditions, in order to produce different products, the furfural refining device needs to be replaced for a long time to complete the raw material switching process, which will also cause waste of resources. Summary of the invention

[0006] In response to at least one of the problems in the above-mentioned prior art, the purpose of the utility model is to provide a furfural refining device that supports rapid switching of different raw materials. By setting a first heat exchanger and a first cooler in parallel and using them in combination with a second heat exchanger and a second cooler set in parallel, different products can be produced alternately, the raw material switching process can be completed quickly, the raw material switching time can be shortened, and at the same time the generation of transition oil can be reduced, thereby saving costs.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A furfural refining device supporting rapid switching of different raw materials comprises a degassing tower, an extraction tower, a flash steam stripping tower, a drying tower and a heating furnace; the flash steam stripping tower comprises a flash unit and a steam stripping unit arranged from top to bottom;

[0009] The feed inlet of the degassing tower is connected to the raw material delivery pipeline; the bottom outlet of the degassing tower is connected to the extraction tower through a first pipeline;

[0010] The top outlet of the extraction tower is connected to the tube side of the first heat exchanger and the second heat exchanger respectively through the second pipeline; the tube side of the first heat exchanger and the second heat exchanger is connected to the heating furnace through the third pipeline; the heating furnace is connected to the flash unit through the fourth pipeline; the bottom outlet of the flash unit is connected to the stripping unit through the fifth pipeline; the bottom outlet of the stripping unit is connected to the third delivery pump, the outlet of the third delivery pump is connected to the shell side of the first heat exchanger and the second heat exchanger respectively through the sixth pipeline, the shell side of the first heat exchanger and the second heat exchanger are connected to the first cooler and the second cooler respectively through the seventh pipeline, and the outlets of the first cooler and the second cooler are used to discharge refined oil; the top outlet of the flash unit is connected to the drying tower through the eighth pipeline; the bottom outlet of the drying tower is connected to the fourth delivery pump, the fourth delivery pump is connected to the extraction tower through the ninth pipeline, and the drying tower is connected to the furfural storage tank through the furfural delivery pipeline; the inlets of the first cooler and the second cooler are connected through the tenth pipeline.

[0011] Preferably, valves are respectively provided before and after the tube side and shell side of the first heat exchanger and the second heat exchanger.

[0012] Preferably, the valves arranged before and after the tube side of the first heat exchanger are respectively the first valve and the second valve; the valves arranged before and after the tube side of the second heat exchanger are respectively the third valve and the fourth valve; the valves arranged before and after the shell side of the first heat exchanger are respectively the fifth valve and the sixth valve; the valves arranged before and after the shell side of the second heat exchanger are respectively the seventh valve and the eighth valve.

[0013] Preferably, valves are provided before and after the first cooler and the second cooler.

[0014] Preferably, the valves arranged before and after the first cooler are the ninth valve and the tenth valve respectively; the valves arranged before and after the second cooler are the eleventh valve and the twelfth valve respectively; the outlets of the first cooler and the second cooler are connected to the bran oil tank area through external delivery pipelines respectively.

[0015] Preferably, a first delivery pump is provided on the raw material delivery pipeline.

[0016] Preferably, a second delivery pump is provided on the first pipeline.

[0017] Preferably, a fifth delivery pump is provided on the furfural delivery pipeline.

[0018] Preferably, the connection position of the first pipeline on the extraction tower is located at the lower part of the extraction tower; the connection position of the pipeline between the fourth delivery pump and the extraction tower on the extraction tower is located at the upper part of the extraction tower.

[0019] The utility model adopts the above technical solution, which has the following advantages:

[0020] 1. The furfural refining device that supports fast switching of different raw materials provided by the utility model is provided with a first

[0021] The heat exchanger and the first cooler are used in combination with the second heat exchanger and the second cooler arranged in parallel. Different products can be produced alternately according to the actual processed raw materials, and the raw material switching process can be completed quickly, thereby shortening the raw material switching time, significantly improving the utilization efficiency of the device, and reducing the generation of transition oil, saving costs.

[0022] 2. The utility model provides a furfural refining device that supports rapid switching of different raw materials. The first heat exchanger and the first cooler are used in combination, and the second heat exchanger and the second cooler are used in combination without interfering with each other. During the raw material switching process, after the third delivery pump product is qualified, it can be quickly switched to any combination to ensure the quality of subsequent products, shorten the raw material switching time, and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the connection structure of a furfural refining device that supports rapid switching of different raw materials provided by an embodiment of the utility model.

[0024] Reference numerals in the figures:

[0025] 1 is a degassing tower; 2 is an extraction tower; 3 is a flash steam stripping tower; 4 is a drying tower; 5 is a heating furnace; 6 is a first delivery pump; 7 is a second delivery pump; 8 is a third delivery pump; 9 is a fourth delivery pump; 10 is a fifth delivery pump; 11 is a first heat exchanger; 12 is a second heat exchanger; 13 is a first cooler; 14 is a second cooler; 15 is a first valve; 16 is a second valve; 17 is a third valve; 18 is a fourth valve; 19 is a fifth valve; 20 is a sixth valve; 21 is a seventh valve; 22 is an eighth valve; 23 is a ninth valve; 24 is a tenth valve; 25 is an eleventh valve; 26 is a twelfth valve; 27 is a thirteenth valve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "assembly", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The utility model provides a furfural refining device that supports rapid switching of different raw materials, comprising a degassing tower, an extraction tower, a flash steam stripping tower, a drying tower and a heating furnace. By arranging a first heat exchanger and a first cooler in parallel and using them in combination with a second heat exchanger and a second cooler arranged in parallel, different products can be produced alternately, the raw material switching process can be completed rapidly, the raw material switching time can be shortened, the generation of transition oil can be reduced, and the cost can be saved.

[0030] Below, the embodiments of the utility model are described in detail with reference to the accompanying drawings.

[0031] Example

[0032] Please refer to Figure 1 The present embodiment provides a furfural refining device that supports rapid switching of different raw materials, including a degassing tower 1, an extraction tower 2, a flash steam stripping tower 3, a drying tower 4 and a heating furnace 5; the flash steam stripping tower 3 includes a flash unit 3A and a stripping unit 3B arranged from top to bottom;

[0033] The feed inlet of the degassing tower 1 is connected to the raw material conveying pipeline; the bottom outlet of the degassing tower 1 is connected to the extraction tower 2 through the first pipeline; the top of the degassing tower 1 is provided with an outlet for discharging the aldehyde-water mixed gas;

[0034] The top outlet of the extraction tower 2 is connected to the tubes of the first heat exchanger 11 and the second heat exchanger 12 through the second pipeline; the tubes of the first heat exchanger 11 and the second heat exchanger 12 are connected to the heating furnace 5 through the third pipeline; the tubes of the first heat exchanger 11 and the second heat exchanger 12 are connected in series with the extraction tower 2 and the heating furnace 5 after being connected in parallel;

[0035] The heating furnace 5 is connected to the flash unit 3A of the flash stripping tower 3 through the fourth pipeline; the bottom outlet of the flash unit 3A is connected to the stripping unit 3B of the flash stripping tower 3 through the fifth pipeline; the top of the stripping unit 3B is provided with an outlet for discharging the aldehyde-water mixture;

[0036] The bottom outlet of the stripping unit 3B is connected to a third delivery pump 8, and the outlet of the third delivery pump 8 is connected to the shell side of the first heat exchanger 11 and the shell side of the second heat exchanger 12 through the sixth pipeline, respectively. The shell side of the first heat exchanger 11 and the shell side of the second heat exchanger 12 are connected to the first cooler 13 and the second cooler 14 through the seventh pipeline, respectively. The outlets of the first cooler 13 and the second cooler 14 are used to discharge refined oil; the top outlet of the flash unit 3A is connected to the drying tower 4 through the eighth pipeline; the bottom outlet of the drying tower 4 is connected to a fourth delivery pump 9, and the fourth delivery pump 9 is connected to the extraction tower 2 through the ninth pipeline, and the drying tower 4 is connected to the furfural storage tank through the furfural delivery pipeline; the inlets of the first cooler 13 and the second cooler 14 are connected through the tenth pipeline; the drying tower 4 is connected to the furfural storage tank through the furfural delivery pipeline; the inlets of the first cooler 13 and the second cooler 14 are connected through the tenth pipeline; the bottom outlet of the extraction tower 2 discharges the extracted liquid and is connected to the extracted liquid system.

[0037] The first cooler 13 and the second cooler 14 are both water coolers.

[0038] In this embodiment, the degassing tower 1 is connected to the raw material delivery pipeline, and a first delivery pump 6 is provided on the raw material delivery pipeline; a second delivery pump 7 is provided on the first pipeline; a fifth delivery pump 10 is provided on the furfural delivery pipeline, and furfural is connected to the drying tower 4 from the furfural storage tank via the fifth delivery pump 10.

[0039] In this embodiment, valves are respectively provided before and after the tube side and shell side of the first heat exchanger 11 and the second heat exchanger 12, so that the first heat exchanger 11 and the second heat exchanger 12 are connected in parallel; valves are respectively provided before and after the first cooler 13 and the second cooler 14, so that the first cooler 13 and the second cooler 14 are connected in parallel.

[0040] In a specific application, the valves arranged before and after the tube side of the first heat exchanger 11 are respectively the first valve 15 and the second valve 16; the valves arranged before and after the tube side of the second heat exchanger are respectively the third valve 17 and the fourth valve 18; the valves arranged before and after the shell side of the first heat exchanger are respectively the fifth valve 19 and the sixth valve 20; the valves arranged before and after the shell side of the second heat exchanger are respectively the seventh valve 21 and the eighth valve 22.

[0041] Specifically, a fifth valve 19 and a seventh valve 21 are arranged on the sixth pipeline; a first heat exchanger 11 and a second heat exchanger 12 are arranged behind the sixth pipeline; there are two seventh pipelines, a sixth valve 20 and a tenth valve 24 are arranged on the seventh pipeline between the first heat exchanger 11 and the first cooler 13, and an eighth valve 22 and a twelfth valve 26 are arranged on the seventh pipeline between the second heat exchanger 12 and the second cooler 14; a tenth pipeline is arranged between the two seventh pipelines, and a ninth valve 23 is arranged on the tenth pipeline; the first cooler 13 and the second cooler 14 are arranged behind the two seventh pipelines, respectively; the bran essential oil is connected to the bran essential oil tank area through an external delivery pipeline, an eleventh valve 25 is arranged on the external delivery pipeline at the rear end of the first cooler 13, and a thirteenth valve 27 is arranged on the external delivery pipeline at the rear end of the second cooler 14.

[0042] A first valve 15 and a third valve 17 are arranged on the second pipeline, the first valve 15 is arranged at the front end of the tube side of the first heat exchanger 11, and the third valve 17 is arranged at the front end of the tube side of the second heat exchanger 12; a second valve 16 and a fourth valve 18 are arranged on the third pipeline, the second valve 16 is arranged at the rear end of the tube side of the first heat exchanger 11, and the fourth valve 18 is arranged at the rear end of the tube side of the second heat exchanger 12; a third delivery pump 8 is arranged on the sixth pipeline; the drying tower 4 is connected to the extraction tower 2 through the ninth pipeline, and a fourth delivery pump 9 is arranged on the ninth pipeline; furfural is connected to the drying tower 4 from the furfural storage tank via the fifth delivery pump 10.

[0043] In this embodiment, the flash steam stripping tower 3, the extraction tower 2, the degassing tower 1 and the drying tower 5 are installed in sequence from left to right, which optimizes the layout of the entire device, improves land utilization, and can reduce the complexity of device installation.

[0044] In this embodiment, the connection position of the first pipeline on the extraction tower 2 is located at the lower part of the extraction tower 2, and the connection position of the pipeline between the fourth delivery pump 9 and the extraction tower 2 on the extraction tower 2 is located at the upper part of the extraction tower 2. In this way, the furfural and crude oil entering the extraction tower 2 can flow in reverse to realize the extraction and separation process.

[0045] The working process of the furfural refining device supporting fast switching of different raw materials in this embodiment is as follows:

[0046] The raw material comes from the raw material tank area, passes through the first delivery pump 6, and enters the degassing tower 1. The aldehyde-water mixed gas is discharged from the top outlet of the degassing tower 1. The rest of the gas enters the extraction tower 2 through the second delivery pump 7 on the first pipeline, and is mixed with the recovered furfural sent from the drying tower 4. An extraction reaction occurs in the extraction tower 2 to obtain an extract containing furfural and refined oil. According to the difference in density, the extract is separated into two phases in the extraction tower 2. The extract is discharged at the bottom of the extraction tower 2 by self-pressure; the refined oil enters the second pipeline at the top of the extraction tower 2 by self-pressure, is heated by the first heat exchanger 11 or the second heat exchanger 12, and is pumped into the heating furnace 5. After the temperature rises, it enters the The flash steam stripping tower 3 enters the flash unit 3A, and part of the aldehyde gas evaporated in the flash unit 3A enters the drying tower 4. The remaining refined oil in the flash unit 3A enters the stripping unit 3B by self-pressure. The aldehyde-water mixture produced by the stripping unit 3B is discharged through the top outlet, and the remaining refined oil is pumped into the first heat exchanger 11 or the second heat exchanger 12 shell side through the third delivery pump 8 through the fifth valve 19 or the seventh valve 21. After cooling, it passes through the sixth valve 20 and the tenth valve 24 or the eighth valve 22 and the twelfth valve 26 and enters the first cooler 13 or the second cooler 14 by self-pressure. After further cooling, it is sent to the tank area through the external delivery pipeline.

[0047] When different raw materials need to be switched according to actual production needs, the fifth valve 19, the sixth valve 20, the seventh valve 21, the eighth valve 22, the tenth valve 24, the eleventh valve 25, the twelfth valve 26, and the thirteenth valve 27 are switched to control the refined oil to flow through the first heat exchanger 11 and the first cooler 13 or the second heat exchanger 12 and the second cooler 14, so as to realize the switching of different raw materials and products, thereby greatly saving the replacement time between different raw materials.

[0048] The specific process of the furfural refining device supporting fast switching of different raw materials in this embodiment for switching different raw materials and corresponding products is as follows:

[0049] When producing rubber plasticizer, the refined oil process adopts the following scheme: flowing through the first heat exchanger 11 and the first cooler 13, the fifth valve 19, the sixth valve 20, the tenth valve 24, and the eleventh valve 25 are fully opened, the seventh valve 21, the eighth valve 22, the ninth valve 23, the twelfth valve 26, and the thirteenth valve 27 are closed, and the second heat exchanger 12 and the second cooler 14 are cut out for standby.

[0050] When it is necessary to switch to transformer base oil production, the raw material will be switched from the reduced three-line hydrodeacidified oil to the conventional second-line hydrodeacidified oil. This is because the conventional second-line raw materials and the reduced three-line raw materials are quite different in viscosity, flash point, pour point, etc., and the internal structure of the heat exchanger and cooler is complex and has many dead corners. Therefore, the replacement time of using a single heat exchanger or cooler product is relatively long.

[0051] The device takes samples from the outlet of the third delivery pump 8 to monitor the replacement of the front road. When the product parameters of the sampling port of the third delivery pump 8 (not shown in the figure) meet the quality requirements of the transformer base oil product, the seventh valve 21, the eighth valve 22, the twelfth valve 26, and the thirteenth valve 27 are opened, and the fifth valve 19, the sixth valve 20, the tenth valve 24, and the eleventh valve 25 are closed. The refined oil flow is changed to flow through the second heat exchanger 12 and the second cooler 14, and the first heat exchanger 11 and the first cooler 13 are cut out for standby. In this way, even if the processing raw materials change, there is no need to wait for the current heat exchanger and cooler to be completely replaced. It is only necessary to achieve the replacement effect before the third delivery pump 8 to use another set of standby heat exchangers and coolers, which not only ensures product quality, but also saves replacement time, thereby saving a lot of raw materials and creating considerable economic value. Therefore, the entire device can quickly complete the switching of different raw materials and products, greatly improve the efficiency of the device, significantly reduce production costs, and greatly improve economic benefits.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A furfural refining device that supports rapid switching of different raw materials, characterized in that: It includes a degassing tower, an extraction tower, a flash steam stripping tower, a drying tower and a heating furnace; the flash steam stripping tower includes a flash unit and a stripping unit arranged from top to bottom; The feed inlet of the degassing tower is connected to the raw material delivery pipeline; the bottom outlet of the degassing tower is connected to the extraction tower through a first pipeline; The top outlet of the extraction tower is connected to the tube side of the first heat exchanger and the second heat exchanger respectively through the second pipeline; the tube side of the first heat exchanger and the second heat exchanger is connected to the heating furnace through the third pipeline; the heating furnace is connected to the flash unit through the fourth pipeline; the bottom outlet of the flash unit is connected to the stripping unit through the fifth pipeline; the bottom outlet of the stripping unit is connected to the third delivery pump, the outlet of the third delivery pump is connected to the shell side of the first heat exchanger and the second heat exchanger respectively through the sixth pipeline, the shell side of the first heat exchanger and the second heat exchanger are connected to the first cooler and the second cooler respectively through the seventh pipeline, and the outlets of the first cooler and the second cooler are used to discharge refined oil; the top outlet of the flash unit is connected to the drying tower through the eighth pipeline; the bottom outlet of the drying tower is connected to the fourth delivery pump, the fourth delivery pump is connected to the extraction tower through the ninth pipeline, and the drying tower is connected to the furfural storage tank through the furfural delivery pipeline; the inlets of the first cooler and the second cooler are connected through the tenth pipeline.

2. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: Valves are respectively provided before and after the tube side and shell side of the first heat exchanger and the second heat exchanger.

3. The furfural refining device supporting rapid switching of different raw materials according to claim 2, characterized in that: The valves arranged before and after the tube side of the first heat exchanger are respectively the first valve and the second valve; the valves arranged before and after the tube side of the second heat exchanger are respectively the third valve and the fourth valve; the valves arranged before and after the shell side of the first heat exchanger are respectively the fifth valve and the sixth valve; the valves arranged before and after the shell side of the second heat exchanger are respectively the seventh valve and the eighth valve.

4. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: Valves are arranged before and after the first cooler and the second cooler.

5. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: The valves arranged before and after the first cooler are the ninth valve and the tenth valve respectively; the valves arranged before and after the second cooler are the eleventh valve and the twelfth valve respectively; the outlets of the first cooler and the second cooler are connected to the bran essential oil tank area through external delivery pipelines respectively.

6. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: The raw material conveying pipeline is provided with a first conveying pump.

7. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: A second delivery pump is arranged on the first pipeline.

8. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: The furfural delivery pipeline is provided with a fifth delivery pump.

9. The furfural refining device supporting rapid switching of different raw materials according to claim 1, characterized in that: The connection position of the first pipeline on the extraction tower is located at the lower part of the extraction tower; the connection position of the pipeline between the fourth delivery pump and the extraction tower on the extraction tower is located at the upper part of the extraction tower.

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