Energy-saving hydrogen sharing process system for multiple hydrogenation devices

Abstract

The utility model discloses an energy-saving hydrogen sharing process system for multiple hydrogenation devices, which is characterized in that outlet ends of a 1 # new hydrogen compressor unit, a 3 # new hydrogen compressor unit and a 4 # new hydrogen compressor unit are connected with a 1 # pipeline, a 3 # pipeline and a 4 # pipeline, and the 3 # pipeline and the 4 # pipeline are connected through a 1 # valve group pipeline; the first valve group comprises a cut-off valve group A and a remote transmission adjusting valve group A which are connected in series, the second valve group comprises a cut-off valve group B and a remote transmission adjusting valve group B which are connected in series, a first valve group pipeline between the remote transmission adjusting valve group A and the remote transmission adjusting valve group B is connected with a second valve group pipeline, and the second valve group pipeline is connected with a third valve group. And the tail end of the pipeline of the second valve group is connected to the pipeline I. The device has the technical characteristics that the problem that the hydrogen supply amount of the diesel hydrofining device is insufficient can be solved, energy waste is reduced, the resource utilization rate is increased, and long-period and high-load stable production of the device is ensured in time.

Description

Technical Field

[0001] The utility model relates to a process system, and more specifically, to an energy-saving process system for hydrogen sharing among multiple hydrogenation units, belonging to the field of petrochemical industry. Background Art

[0002] At present, in the production of diesel hydrofining, the 3 million tons / year diesel hydrofining unit needs to blend catalytic diesel and operate at high load, generally requiring the supplement of 40,000 Nm3 / h of fresh hydrogen. However, the load of a single new hydrogen compressor is limited. Therefore, other diesel hydrocracking units are needed to provide hydrogen to meet the production needs of the 3 million tons / year diesel hydrofining unit. Content of the Utility Model

[0003] The utility model provides an energy-saving process system for hydrogen sharing among multiple hydrogenation units, which has the technical characteristics of being able to solve the problem of insufficient hydrogen supply in diesel hydrofining units, reducing energy waste, improving resource utilization rate, and ensuring long-term and high-load stable production of the units.

[0004] In order to achieve the above object, the utility model is realized through the following technical solutions:

[0005] An energy-saving process system for hydrogen sharing among multiple hydrogenation units of the utility model includes three inlet pipelines for transmitting new hydrogen, and the three inlet pipelines are respectively connected to a 1# new hydrogen compressor unit, a 3# new hydrogen compressor unit, and a 4# new hydrogen compressor unit. The outlet ends of the 1# new hydrogen compressor unit, the 3# new hydrogen compressor unit, and the 4# new hydrogen compressor unit are respectively connected in a converging manner to a first pipeline, a third pipeline, and a fourth pipeline with a new hydrogen outlet at the end. The third pipeline and the fourth pipeline are connected through a first valve group pipeline. A first valve group and a second valve group are connected to the first valve group pipeline. The first valve group includes a series-connected cut-off valve group A and a remote control regulating valve group A, and the cut-off valve group A is located on the first valve group pipeline between the remote control regulating valve group A and the third pipeline. The second valve group includes a series-connected cut-off valve group B and a remote control regulating valve group B, and the cut-off valve group B is located on the first valve group pipeline between the remote control regulating valve group B and the fourth pipeline. A second valve group pipeline is connected to the first valve group pipeline between the remote control regulating valve group A and the remote control regulating valve group B. A third valve group is connected to the second valve group pipeline. The third valve group includes a series-connected cut-off valve group C and a remote control regulating valve group C. The end of the second valve group pipeline is connected to the first pipeline.

[0006] Preferably, each of the remote control regulating valve group A, the remote control regulating valve group B, and the remote control regulating valve group C includes two stop valves, a pneumatic control valve, and an external connection valve located between the two stop valves. An internal control valve line is formed among the stop valve, the pneumatic control valve, and the external connection valve. A switching pipeline with a stop valve is connected in parallel to the internal control valve line.

[0007] Preferably, each of the shut-off valve groups A, B, and C includes a series-connected globe valve, solenoid valve, and remote transmission flowmeter; the remote transmission flowmeters in the shut-off valve groups A, B, and C are divided into a first remote transmission flowmeter, a second remote transmission flowmeter, and a third remote transmission flowmeter. The second remote transmission flowmeter is located on the internal control valve line of the remote control valve group B, the first remote transmission flowmeter is located outside the internal control valve line of the remote control valve group A, and the third remote transmission flowmeter is located outside the internal control valve line of the remote control valve group C.

[0008] Preferably, the 1# new hydrogen compressor unit includes 1# new hydrogen compressor A and 1# new hydrogen compressor B connected in parallel; the 3# new hydrogen compressor unit includes 3# new hydrogen compressor A, 3# new hydrogen compressor B, and 3# new hydrogen compressor C connected in parallel; the 4# new hydrogen compressor unit includes 4# new hydrogen compressor A, 4# new hydrogen compressor B, and 4# new hydrogen compressor C connected in parallel.

[0009] Preferably, a remote transmission pressure gauge is connected to the second valve group pipeline between the remote control valve group C and the first pipeline.

[0010] Beneficial effects: It can solve the problem of insufficient hydrogen supply in the diesel hydrofining unit; reduce energy waste and improve resource utilization rate; avoid being forced to significantly reduce the unit processing load due to the failure of a single new hydrogen compressor, reduce misoperations, and reduce operation risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present utility model. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following further describes the present utility model with reference to the accompanying drawings of the specification, but the present utility model is not limited to the following embodiments.

[0013] As Figure 1Shown is a specific embodiment of a process system for hydrogen sharing in an energy-saving multi-unit hydrogenation plant. This embodiment is a process system for hydrogen sharing in an energy-saving multi-unit hydrogenation plant, including three inlet pipelines for transporting fresh hydrogen, and the three inlet pipelines are respectively connected to a 1# fresh hydrogen compressor unit, a 3# fresh hydrogen compressor unit, and a 4# fresh hydrogen compressor unit. The outlet ends of the 1# fresh hydrogen compressor unit, 3# fresh hydrogen compressor unit, and 4# fresh hydrogen compressor unit are respectively convergently connected to a No. 1 pipeline 1, a No. 3 pipeline 2, and a No. 4 pipeline 3 with a fresh hydrogen outlet at the end. The No. 3 pipeline 2 and the No. 4 pipeline 3 are connected through a No. 1 valve group pipeline 4. A No. 1 valve group and a No. 2 valve group are connected to the No. 1 valve group pipeline 4. The No. 1 valve group includes a series-connected cut-off valve group A5 and a remote control regulating valve group A6, and the cut-off valve group A5 is located on the No. 1 valve group pipeline 4 between the remote control regulating valve group A6 and the No. 3 pipeline 2. The No. 2 valve group includes a series-connected cut-off valve group B7 and a remote control regulating valve group B8, and the cut-off valve group B7 is located on the No. 1 valve group pipeline 4 between the remote control regulating valve group B8 and the No. 4 pipeline 3. A No. 2 valve group pipeline 9 is connected to the No. 1 valve group pipeline 4 between the remote control regulating valve group A6 and the remote control regulating valve group B8. A No. 3 valve group is connected to the No. 2 valve group pipeline 9. The No. 3 valve group includes a series-connected cut-off valve group C10 and a remote control regulating valve group C11. The end of the No. 2 valve group pipeline 9 is connected to the No. 1 pipeline 1.

[0014] Operation mode / principle: After the fresh hydrogen from the 3# fresh hydrogen compressor unit and the 4# fresh hydrogen compressor unit enters the reciprocating compressor for pressurization, it enters the reactors of their respective units through the fresh hydrogen outlets of the No. 3 pipeline 2 and the No. 4 pipeline 3 from the outlets of the respective compressors (3# fresh hydrogen compressor A16, 3# fresh hydrogen compressor B17, 3# fresh hydrogen compressor C18, 4# fresh hydrogen compressor A19, 4# fresh hydrogen compressor B20, 4# fresh hydrogen compressor C21) of the 3# fresh hydrogen compressor unit and the 4# fresh hydrogen compressor unit ( Figure 1 omitted in the figure) to participate in the reaction. A No. 1 valve group pipeline 4 and a No. 2 valve group pipeline 9 are added to the outlet pipelines of the fresh hydrogen compressors of the 3# fresh hydrogen compressor unit and the 4# fresh hydrogen compressor unit and are combined with the cut-off valve group and the remote control regulating valve group, so that the surplus hydrogen can be supplemented into the reactor corresponding to the hydrogen provided by the 1# fresh hydrogen compressor unit when needed, making up for the problem of insufficient flow of a single refining compressor.

[0015] The surplus hydrogen flows through the cut-off valve group A5 and the cut-off valve group B7 from the outlet pipelines of the 3# fresh hydrogen compressor unit and the 4# fresh hydrogen compressor unit. The flow orifice monitors the flow rate and controls the valve openings of the remote control regulating valve group A6 and the remote control regulating valve group B8 to adjust the hydrogen volume. The hydrogen flows through the cut-off valve group C10 monitored by the remote control pressure gauge 13 and with a high-high pressure interlock for the refining system and is sent to the outlet hydrogen pipeline (No. 1 pipeline 1) of the 1# fresh hydrogen compressor unit; when the high-high pressure interlock is triggered, the valve of the cut-off valve group C10 is closed to stop the hydrogen supply and prevent the occurrence of system overpressure accidents.

[0016] Specifically, in actual production, according to the diesel balance requirements of the whole plant, the hydrogen surplus of the 3# new hydrogen compressor unit and the 4# new hydrogen compressor unit in the 3.5 million tons / year diesel hydrocracking unit can be used to supplement the hydrogen shortage in the 3 million tons / year diesel hydrotreating unit used by the 1# new hydrogen compressor unit, so as to meet the long-term and high-load stable production.

[0017] Number Equipment Name Specification Description 1 Interlocking Cut-off Valve (Cut-off Valve Group) Pneumatic Three-Eccentric Interlocking Switch Butterfly Valve 2 Remote Pressure Gauge Operating Temperature 150°C, Pressure 15MPa 3 Pneumatic Control Valve Nominal Diameter DN150, 1500CL 4 Orifice Flowmeter (Remote Flowmeter) Corner Tap Ring-Type Chamber Standard Orifice

[0018] Technical requirements of this application

[0019] 1. According to the changes in pipeline design, the compressor manufacturer is required to conduct pulsation analysis on the unit.

[0020] 2. The new hydrogen from two sets of diesel hydrocracking units is supplied to the diesel hydrotreating unit (3# new hydrogen compressor unit, 4#

[0021] new hydrogen compressor unit), so as to maintain normal production even when the new hydrogen compressor in the refining unit is shut down.

[0022] 3. The new hydrogen systems of two sets of diesel hydrocracking units (3# new hydrogen compressor unit, 4# new hydrogen compressor unit) are complementary, so that normal production can be maintained with only one new hydrogen compressor unit, reducing the risk of load reduction caused by compressor failure.

[0023] Manufacturing requirements of this application

[0024] 1. During the welding process, strictly implement the welding process specifications.

[0025] 2. The quality of the materials used and the processing, welding and assembly of each component should be inspected and qualified according to the regulations.

[0026] 3. Each valve should be carefully inspected and accepted.

[0027] 4. Before assembly, strictly clean the inner and outer surfaces of the components, and no sundries should be left.

[0028] This utility model makes full use of the surplus hydrogen of the 3# new hydrogen compressor unit and the 4# new hydrogen compressor unit to solve the problem of insufficient hydrogen supply in the diesel hydrotreating unit, reduce energy waste, improve resource utilization rate, and ensure long-term and high-load stable production of the unit, belonging to the field of petrochemical industry. It solves the problem of insufficient hydrogen supply in the diesel hydrotreating unit; reduces energy waste and improves resource utilization rate; avoids being forced to significantly reduce the processing load of the unit due to the failure of a single new hydrogen compressor, reduces misoperations and operation risks, and greatly improves the collaborative anti-interference ability of the three sets of diesel hydrogenation units.

[0029] In a preferred embodiment, the remote control valve group A6, the remote control valve group B8, and the remote control valve group C11 each include two stop valves and a pneumatic control valve and an external valve located between the two stop valves. The stop valves, the pneumatic control valves, and the external valves constitute an internal control valve line, and the internal control valve line is connected in parallel with a switching pipeline with a stop valve. The shut-off valve group A5, shut-off valve group B7, and shut-off valve group C10 all include a shut-off valve, a solenoid valve, and a remote flowmeter 12 connected in series; the remote flowmeters 12 in the shut-off valve group A5, shut-off valve group B7, and shut-off valve group C10 are divided into remote flowmeter No. 12, remote flowmeter No. 2, and remote flowmeter No. 3, and the remote flowmeter No. 2 is located on the internal control valve line in the remote regulating valve group B8, the No. 1 remote flowmeter 12 is located outside the internal control valve line of the remote regulating valve group A6, and the No. 3 remote flowmeter 12 is located outside the internal control valve line of the remote regulating valve group C11.

[0030] Remote control valve group A6, remote control valve group B8, remote control valve group C11, shut-off valve group A5, shut-off valve group B7, shut-off valve group C10, etc. use signal transmission connection to achieve interlocking control, which can be connected to the DCS system or controller for control operation, and can realize intelligent control operation.

[0031] In a preferred embodiment, the 1# new hydrogen compressor group includes 1# new hydrogen compressor A14 and 1# new hydrogen compressor B15 in parallel; the 3# new hydrogen compressor group includes 3# new hydrogen compressor A16, 3# new hydrogen compressor B17, and 3# new hydrogen compressor C18 in parallel; the 4# new hydrogen compressor group includes 4# new hydrogen compressor A19, 4# new hydrogen compressor B20, and 4# new hydrogen compressor C21 in parallel. Multiple groups of new hydrogen compressors can meet the production needs.

[0032] In a preferred embodiment, a remote pressure gauge 13 is connected to the No. 2 valve group pipeline 9 between the remote regulating valve group C11 and the No. 1 pipeline 1, which has a simple structure and strong practicality.

[0033] Finally, it should be noted that the present invention is not limited to the above embodiments and may be subject to many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered to be within the scope of protection of the present invention.

Claims

1. An energy-saving process system for hydrogen sharing among multiple sets of hydrogenation units, characterized in that: It includes three inlet pipelines for transporting new hydrogen, and the three inlet pipelines are respectively connected to the 1# new hydrogen compressor unit, the 3# new hydrogen compressor unit, and the 4# new hydrogen compressor unit. The outlet ends of the 1# new hydrogen compressor unit, the 3# new hydrogen compressor unit, and the 4# new hydrogen compressor unit are respectively converged and connected with a No. 1 pipeline (1), a No. 3 pipeline (2), and a No. 4 pipeline (3) with the end being the new hydrogen outlet. The No. 3 pipeline (2) and the No. 4 pipeline (3) are connected through a No. 1 valve group pipeline (4). A No. 1 valve group and a No. 2 valve group are connected to the No. 1 valve group pipeline (4). The No. 1 valve group includes a series-connected cut-off valve group A (5) and a remote control regulating valve group A (6), and the cut-off valve group A (5) is located on the No. 1 valve group pipeline (4) between the remote control regulating valve group A (6) and the No. 3 pipeline (2). The No. 2 valve group includes a series-connected cut-off valve group B (7) and a remote control regulating valve group B (8), and the cut-off valve group B (7) is located on the No. 1 valve group pipeline (4) between the remote control regulating valve group B (8) and the No. 4 pipeline (3). A No. 2 valve group pipeline (9) is connected to the No. 1 valve group pipeline (4) between the remote control regulating valve group A (6) and the remote control regulating valve group B (8). A No. 3 valve group is connected to the No. 2 valve group pipeline (9). The No. 3 valve group includes a series-connected cut-off valve group C (10) and a remote control regulating valve group C (11). The end of the No. 2 valve group pipeline (9) is connected to the No. 1 pipeline (1).

2. The process system for hydrogen sharing of a multi-set hydrogenation unit with energy saving according to claim 1, characterized in that: The remote control regulating valve group A (6), the remote control regulating valve group B (8), and the remote control regulating valve group C (11) all include two stop valves, a pneumatic regulating valve, and an external connection valve located between the two stop valves. An internal control valve line is formed among the stop valve, the pneumatic regulating valve, and the external connection valve. A switching pipeline with a stop valve is connected in parallel to the internal control valve line.

3. The process system for hydrogen sharing in an energy-saving multi-set hydrogenation unit according to claim 1 or 2, characterized in that: The cut-off valve group A (5), the cut-off valve group B (7), and the cut-off valve group C (10) all include a series-connected stop valve, a solenoid valve, and a remote flowmeter (12). The remote flowmeters (12) in the cut-off valve group A (5), the cut-off valve group B (7), and the cut-off valve group C (10) are divided into a No. 1 remote flowmeter (12), a No. 2 remote flowmeter (12), and a No. 3 remote flowmeter (12). The No. 2 remote flowmeter (12) is located on the internal control valve line in the remote control regulating valve group B (8). The No. 1 remote flowmeter (12) is located outside the internal control valve line of the remote control regulating valve group A (6). The No. 3 remote flowmeter (12) is located outside the internal control valve line of the remote control regulating valve group C (11).

4. A process system for hydrogen sharing in a multi-set hydrogenation unit with energy saving according to claim 1, characterized in that: The 1# new hydrogen compressor unit includes a parallel-connected 1# new hydrogen compressor A (14) and 1# new hydrogen compressor B (15). The 3# new hydrogen compressor unit includes a parallel-connected 3# new hydrogen compressor A (16), 3# new hydrogen compressor B (17), and 3# new hydrogen compressor C (18). The 4# new hydrogen compressor unit includes a parallel-connected 4# new hydrogen compressor A (19), 4# new hydrogen compressor B (20), and 4# new hydrogen compressor C (21).

5. A process system for hydrogen sharing in a multi-set hydrogenation unit with energy saving according to claim 1, characterized in that: A remote pressure gauge (13) is connected to the No. 2 valve group pipeline (9) between the remote control regulating valve group C (11) and the No. 1 pipeline (1).

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