Selective hydrogenation prefractionation system for gasoline hydrogenation device

Abstract

The utility model belongs to the technical field of gasoline hydrogenation devices, and particularly relates to a selective hydrogenation prefractionation system for a gasoline hydrogenation device. The selective hydrogenation pre-fractionation system for the gasoline hydrogenation device comprises a pre-hydrogenation reactor and a raw oil buffer tank, the bottom of the pre-hydrogenation reactor is connected with a pre-hydrogenation reactor heat exchanger, the pre-hydrogenation reactor heat exchanger is connected with a pre-fractionating tower, and the raw oil buffer tank is connected with the pre-fractionating tower. The upper part of the raw oil buffer tank is connected with a gasoline pipeline through a raw oil filter; and a sieve plate is arranged in the raw oil filter. According to the selective hydrogenation prefractionation system for the gasoline hydrogenation device provided by the utility model, the prefractionation system is arranged, so that the problem that the requirement of upstream stable gasoline hydrogenation cannot be met under the condition that a full-fraction gasoline hydrogenation unit is independently operated in gasoline hydrogenation is solved, the productivity of a single set of device is improved, and the production efficiency is improved through the prefractionation system. The octane number of the product gasoline is effectively reduced, and the production benefit is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gasoline hydrogenation device technical field, concretely relates to a selective hydrogenation prefractionation system for gasoline hydrogenation device. BACKGROUND

[0002] The gasoline hydrogenation device is provided with selective gasoline hydrogenation unit and full fraction gasoline hydrogenation unit, according to the stable gasoline delivery capacity of upstream device, generally selects a single set of device or two sets of devices to run simultaneously, but in actual use, due to upstream device raw material property change or processing load adjustment, often there is a single set of device cannot meet the production demand situation.

[0003] Selective gasoline hydrogenation process is that raw material gasoline is converted into monoolefin through prehydrogenation reactor, and is divided into light gasoline and heavy gasoline through fractionating column, heavy gasoline is sent to hydrogenation desulfurization part, and deep desulfurization is carried out, and the heavy gasoline after desulfurization is mixed with light gasoline as refined gasoline product, and the characteristic is that the maximum degree of olefin saturation and the gasoline octane loss caused by olefin saturation are reduced;Full fraction gasoline hydrogenation process is that raw material oil is desulfurized through hydrogenation desulfurization part after prehydrogenation reactor, and is directly delivered as product gasoline, and the characteristic is that the device energy consumption is low, but the product gasoline octane loss is large, therefore, it is very necessary to optimize the design of gasoline hydrogenation device, increase the single set of device capacity, and reduce the product gasoline octane loss. UTILITY MODEL CONTENTS

[0004] In view of the defects of prior art, the selective hydrogenation prefractionation system for gasoline hydrogenation device is provided, the gasoline hydrogenation device is optimized, the prefractionation system is arranged on the basis of full fraction gasoline hydrogenation device, the short board that gasoline hydrogenation cannot meet the upstream stable gasoline hydrogenation in the case of single running full fraction gasoline hydrogenation unit is solved, the single set of device capacity is improved, and the product gasoline octane is effectively reduced in cooperation with the prefractionation system, and the production benefit is improved.

[0005] The selective hydrogenation prefractionation system for gasoline hydrogenation device, including prehydrogenation reactor and raw material oil buffer tank, the prehydrogenation reactor bottom is connected with prehydrogenation reactor heat exchanger, the prehydrogenation reactor heat exchanger is connected with prefractionating column, the prefractionating column bottom is connected with raw material oil heat exchanger through heavy gasoline pump, the raw material oil heat exchanger is connected with prehydrogenation reactor heat exchanger, the prehydrogenation reactor heat exchanger is provided with pipeline connected with prehydrogenation reactor top, the raw material oil buffer tank bottom is connected with raw material oil heat exchanger through raw material oil feeding pump.

[0006] Preferably, the prefractionating column top is connected with prefractionating column air cooling, the prefractionating column air cooling is connected with prefractionating column water cooling, and the prefractionating column water cooling is connected with prefractionating column reflux tank.

[0007] Preferably, the pre-fractionation reflux tank is connected with a light gasoline delivery pump, and the light gasoline delivery pump is provided with a pipeline connected with the top of the pre-fractionation tower.

[0008] Preferably, the light gasoline delivery pump is provided with a light gasoline delivery pipeline.

[0009] Preferably, the heavy gasoline pump is respectively provided with a heavy gasoline buffer tank feeding pipeline and a stripping tower feeding pipeline.

[0010] Preferably, the upper part of the raw oil buffer tank is connected with a raw oil filter, the raw oil filter is connected with a gasoline pipeline, and the raw oil filter is provided with a sieve plate.

[0011] Preferably, the raw oil heat exchanger is provided with a full-range gasoline hydrogenation raw oil pipeline.

[0012] Specifically, the selective hydrogenation pre-fractionation system for the gasoline hydrogenation device is used, the stable gasoline from an upstream catalytic device is transported to a raw oil filter through a gasoline pipeline, the sieve plate with different hole diameters is arranged in the filter, the sieve plates are placed in a staggered manner, the stable flow of gasoline is ensured, then the gasoline is transported to a raw oil buffer tank and a feeding pump, and then is transported to a raw oil heat exchanger, and then is reacted in a pre-hydrogenation reactor after heat exchange, and then is heat-exchanged again to make the product reach the temperature required for fractionation, then is cut into light gasoline and heavy gasoline through a pre-fractionation tower, the light gasoline is directly delivered through a light gasoline delivery pipeline, and the heavy gasoline at the bottom of the fractionation tower is pressurized through a heavy gasoline pump, is heat-exchanged through a raw oil heat exchanger, and then is delivered to a full-range gasoline hydrogenation raw oil pipeline through a full-range raw oil filter inlet to perform stable reaction.

[0013] Compared with the prior art, the selective hydrogenation pre-fractionation system for the gasoline hydrogenation device has the beneficial effects that the processing capacity of a single set of gasoline hydrogenation device is effectively improved, the product gasoline octane value loss is reduced by mixing the heavy gasoline with the raw oil for gasoline hydrogenation, and the overall energy consumption of the device is reduced by combining the gasoline at different stages with the heat exchanger and utilizing the heat of the products at different stages to provide energy. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a structural schematic view of the selective hydrogenation pre-fractionation system for the gasoline hydrogenation device in the utility model.

[0015] In the figure: 1, pre-hydrogenation reactor; 2, raw oil filter; 3, raw oil buffer tank; 4, raw oil feeding pump; 5, raw oil heat exchanger; 6, full-range gasoline hydrogenation raw oil pipeline; 7, pre-hydrogenation reactor heat exchanger; 8, gasoline pipeline; 9, stripping tower feeding pipeline; 10, heavy gasoline buffer tank feeding pipeline; 11, heavy gasoline pump; 12, pre-fractionating tower; 13, pre-fractionating tower air cooling; 14, pre-fractionating tower water cooling; 15, pre-fractionating tower reflux tank; 16, light gasoline external feeding pump; 17, light gasoline external feeding pipeline; 201, sieve plate. DETAILED DESCRIPTION

[0016] The utility model will be further explained in connection with specific embodiments.

[0017] As Figure 1 shown, the selective hydrogenation pre-fractionating system for gasoline hydrogenation device includes a pre-hydrogenation reactor 1, the pre-hydrogenation reactor 1 is connected with a pre-hydrogenation reactor heat exchanger 7, the pre-hydrogenation reactor heat exchanger 7 is connected with a pre-fractionating tower 12, the pre-fractionating tower 12 bottom is connected with a heavy gasoline pump 11, the heavy gasoline pump 11 is connected with a raw oil heat exchanger 5 through a pipeline, the raw oil heat exchanger 5 is connected with the pre-hydrogenation reactor heat exchanger 7, and the raw oil heat exchanger 5 is provided with a full-range gasoline hydrogenation raw oil pipeline 6.

[0018] The pre-hydrogenation reactor heat exchanger 7 is provided with a pipeline connected with the top of the pre-hydrogenation reactor 1.

[0019] The pre-fractionating tower 12 top is connected with a pre-fractionating tower air cooling 13, the pre-fractionating tower air cooling 13 is connected with a pre-fractionating tower water cooling 14, and the pre-fractionating tower water cooling 14 is connected with a pre-fractionating tower reflux tank 15.

[0020] The pre-fractionating tower reflux tank 15 is connected with a light gasoline external feeding pump 16, and the light gasoline external feeding pump 16 is provided with a pipeline connected with the top of the pre-fractionating tower 12.

[0021] The light gasoline external feeding pump 16 is provided with a light gasoline external feeding pipeline 17.

[0022] The heavy gasoline pump 11 is respectively provided with a heavy gasoline buffer tank feeding pipeline 10 and a stripping tower feeding pipeline 9.

[0023] The bottom of the raw oil heat exchanger 5 is connected with a raw oil feeding pump 4, and the raw oil feeding pump 4 is connected with a raw oil buffer tank 3.

[0024] The upper portion of the raw oil buffer tank 3 is connected with a gasoline pipeline 8 through a raw oil filter 2, and the raw oil filter 2 is provided with a sieve plate 201.

[0025] Specifically, the selective hydrogenation pre-fractionation system for gasoline hydrogenation device, the stable gasoline from the upstream catalytic device is transported to the raw oil filter 2 through the gasoline pipeline 8, the raw oil filter 2 is provided with sieve plates 201 with different hole diameters, the sieve plates 201 are placed in a staggered manner, the stable flow of gasoline is ensured, then the raw oil is transported to the raw oil heat exchanger 5 through the raw oil buffer tank 3 and the raw oil feeding pump 4, after twice heat exchange, the raw oil enters the pre-hydrogenation reactor 1 to react, after the reaction is completed, the product is heated again to reach the required temperature for fractionation, then the product is cut into light gasoline and heavy gasoline through the pre-fractionation tower 12, the light gasoline is directly sent out after being cooled through the light gasoline external delivery pipeline 17, the heavy gasoline at the bottom of the tower is pressurized through the heavy gasoline pump 11 and heated through the raw oil heat exchanger 5, then the heavy gasoline is sent out to the full-range gasoline hydrogenation raw oil pipeline 6 to the inlet of the full-range raw oil filter for stable reaction.

Claims

1. A selective hydrogenation prefractionation system for gasoline hydrogenation units, characterized by, The pre-hydrogenation reactor (1) is connected with a pre-hydrogenation reactor heat exchanger (7), the pre-hydrogenation reactor heat exchanger (7) is connected with a pre-fractionating column (12), the bottom of the pre-fractionating column (12) is connected with a heavy gasoline pump (11), the heavy gasoline pump (11) is connected with a raw oil heat exchanger (5) through a pipeline, the raw oil heat exchanger (5) is connected with the pre-hydrogenation reactor heat exchanger (7), and the raw oil heat exchanger (5) is provided with a full-range gasoline hydrogenation raw oil pipeline (6).

2. The selective hydrogenation prefractionation system for gasoline hydroprocessing units according to claim 1, characterized by the fact that: The pre-hydrogenation reactor heat exchanger (7) is provided with a pipeline connected with the top of the pre-hydrogenation reactor (1).

3. The selective hydrogenation prefractionation system for gasoline hydroprocessing units according to claim 1, characterized by the fact that: The top of the pre-fractionating column (12) is connected with a pre-fractionating column air cooling device (13), the pre-fractionating column air cooling device (13) is connected with a pre-fractionating column water cooling device (14), and the pre-fractionating column water cooling device (14) is connected with a pre-fractionating column reflux tank (15).

4. The selective hydro- prefractionation system for gasoline hydro- treatment units according to claim 3, characterized in that: The pre-fractionating column reflux tank (15) is connected with a light gasoline delivery pump (16), and the light gasoline delivery pump (16) is provided with a pipeline connected with the top of the pre-fractionating column (12).

5. The selective hydro- prefractionation system for gasoline hydro- treatment units according to claim 4, characterized in that: The light gasoline delivery pump (16) is provided with a light gasoline delivery pipeline (17).

6. The selective hydro- prefractionation system for gasoline hydro- treatment units according to claim 1, characterized in that: The heavy gasoline pump (11) is respectively provided with a heavy gasoline buffer tank feeding pipeline (10) and a stripping column feeding pipeline (9).

7. The selective hydro- prefractionation system for gasoline hydro- treatment units according to claim 1, characterized in that: The bottom of the raw oil heat exchanger (5) is connected with a raw oil feeding pump (4), and the raw oil feeding pump (4) is connected with a raw oil buffer tank (3).

8. The selective hydro- prefractionation system for gasoline hydro- treatment units according to claim 7, characterized in that: The upper part of the raw oil buffer tank (3) is connected with a gasoline pipeline (8) through a raw oil filter (2), and the raw oil filter (2) is provided with a sieve plate (201).

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