A system and method for accelerating the start-up of a propylene distillation tower

Abstract

The present invention discloses a system capable of accelerating the start-up of a propylene distillation tower, comprising a reflux system and a guard bed system, wherein the reflux system comprises a reflux tank, the guard bed system comprises a guard bed, a cooler, a propylene tank area and an A cross-line pipeline, an A pipeline is arranged between the guard bed and the cooler, a B pipeline is arranged between the guard bed and the propylene tank area, one end of the A cross-line pipeline is connected to the A pipeline, the other end of the A cross-line pipeline is connected to the B pipeline, and the reflux tank is connected to the cooler pipeline; and a method capable of accelerating the start-up of a propylene distillation tower is also disclosed. The present invention completes the rapid gas phase pressurization and liquid phase propylene supplementation when the propylene distillation tower is started, fully meets the start-up conditions, shortens the qualified time of propylene products, and improves economic benefits.

Description

Technical Field

[0001] The invention relates to a system and a method for accelerating the start-up of a propylene distillation tower, belonging to the technical field of propylene distillation towers. Background Art

[0002] According to the process design of Lummus of the United States, the propylene distillation tower is equipped with two 3" propylene liquid phase lines. During the start-up period, the propylene distillation tower needs to be supplemented with 50 tons of gas-phase propylene for real gas-gas exchange, and 600 tons of liquid-phase propylene is introduced to realize the circulation establishment of the propylene distillation tower. Simply relying on the current two 3" propylene liquid phase lines (about 15t / h, and conflicting with the propylene machine replenishment) is completely unable to meet the start-up conditions, which prolongs the qualified time of propylene products and reduces economic benefits. Summary of the invention

[0003] The purpose of the present invention is to provide a system for accelerating the start-up of a propylene distillation tower, and also to provide a method for accelerating the start-up of a propylene distillation tower. The present invention completes the rapid gas phase pressurization and liquid phase propylene replenishment when the propylene distillation tower is started, fully meets the start-up conditions, shortens the qualified time of propylene products, and improves economic benefits.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a system capable of accelerating the start-up of a propylene distillation tower, comprising a reflux system and a guard bed system, wherein the reflux system comprises a reflux tank, the guard bed system comprises a guard bed, a cooler, a propylene tank area and an A cross-line pipeline, an A pipeline is arranged between the guard bed and the cooler, a B pipeline is arranged between the guard bed and the propylene tank area, one end of the A cross-line pipeline is connected to the A pipeline, the other end of the A cross-line pipeline is connected to the B pipeline, and the reflux tank is connected to the cooler pipeline; the system completes the rapid gas phase pressurization and liquid phase propylene supplementation when the propylene distillation tower is started, fully meets the start-up conditions, shortens the qualified time of propylene products, and improves economic benefits.

[0005] The aforementioned system for accelerating the start-up of a propylene distillation tower, the reflux system also includes a propylene distillation tower A condenser and a propylene distillation tower B condenser, a C pipeline and a D pipeline are arranged between the propylene distillation tower A condenser and the propylene distillation tower B condenser, an E pipeline and an F pipeline are arranged on the reflux tank, one end of the E pipeline is connected to the reflux tank, the other end of the E pipeline is connected to the D pipeline, one end of the F pipeline is connected to the reflux tank, the other end of the F pipeline is connected to the propylene distillation tower, and a propylene distillation tower reflux pump is arranged on the F pipeline.

[0006] The aforementioned system for accelerating the start-up of a propylene distillation tower, wherein the B pipeline is provided with a B cross-line pipeline.

[0007] The aforementioned system for accelerating the start-up of a propylene distillation tower comprises: a G pipe is arranged on the cooler, one end of the G pipe is connected to the cooler, the other end of the G pipe is connected to the F pipe, an H pipe is arranged on the G pipe, the inlet and outlet of the H pipe are both connected to the G pipe, a propylene product pump is arranged on the G pipe, and the propylene product pump is placed between the inlet and outlet of the H pipe.

[0008] The aforementioned system for accelerating the start-up of a propylene distillation tower comprises: an A blind plate is arranged on the B pipeline, a B blind plate is arranged on the A cross-line pipeline, an A valve, a B valve, a C valve, a D valve, an E valve and an F valve are arranged on the B pipeline in sequence, the A blind plate is placed on the pipe section between the A valve and the B valve, a G valve is arranged on the B cross-line pipeline, both ends of the B cross-line pipeline are placed on the pipe section between the A blind plate and the B valve, the F valve is placed at one end close to the protection bed, the A cross-line pipeline is arranged with an H valve and an I valve in sequence, and the B blind plate is placed on the pipe section between the H valve and the I valve.

[0009] The aforementioned system for accelerating the start-up of a propylene distillation tower comprises: a C blind plate on the H pipeline, a J valve on the G pipeline, a K valve and an L valve on the H pipeline, the C blind plate is placed on the pipe section between the K valve and the L valve, and one end of the G pipeline is placed on the pipe section between the J valve and the propylene product pump.

[0010] The aforementioned system for accelerating the start-up of a propylene distillation tower comprises: an M valve, an N valve, a P valve, a Q valve and an R valve arranged in sequence on the F pipeline; the M valve is placed at one end close to the reflux tank; a C cross-line pipeline is connected to the pipe section between the Q valve and the R valve; and an S valve is arranged on the C cross-line pipeline.

[0011] A method for accelerating the start-up of a propylene distillation tower comprises the following steps:

[0012] S1. Before starting work, make sure that the three blind plates A, B and C are in the open position, remove the valve core of the J valve on the G pipeline, and ensure that all valves are in the closed position;

[0013] S2, liquid propylene enters the propylene product line in reverse through the minimum flow return line of the propylene pump in the propylene tank area and reaches the pipeline boundary area of ​​the olefin separation unit. At this time, slowly open valve A, valve G, valve B, valve C, valve D, valve E, and valve F on the cross-line pipeline B, and liquid propylene reaches the guard bed outlet pipeline via pipeline B;

[0014] S3, slowly open valves H and I on the A cross-line pipeline, and the liquid propylene passes through the A cross-line pipeline before reaching the cooler;

[0015] S4, liquid propylene passes through the cooler in reverse, flows through pipeline G and pipeline H in sequence, slowly opens pipeline K valve and L valve, and liquid propylene reaches the inlet pipeline of propylene product pump;

[0016] S5, slowly open the pipeline M valve and N valve, and the liquid propylene reaches the inlet of the reflux pump of the propylene distillation tower and enters the reflux tank;

[0017] S6, when the liquid level in the reflux tank is higher than 50%, start the reflux pump of the propylene distillation tower, and then slowly open the pipeline P valve, Q valve, S valve and R valve on the C cross-line pipeline to introduce liquid propylene into the propylene distillation tower.

[0018] Compared with the prior art, the present invention adds a cross-line pipeline to the one-way valve in the boundary area of ​​the propylene product production line, adds a B cross-line pipeline to the propylene protection bed, and reversely sends propylene through a propylene pump in the tank area during the start-up period to achieve rapid liquid replenishment (about 50 t / h) of the propylene distillation tower, shortens the cycle establishment of the propylene distillation tower from 40 hours before optimization to 12 hours, creates good conditions for rapid qualification of propylene products, completes rapid gas phase pressurization and liquid phase propylene replenishment when the propylene distillation tower is started, fully meets the start-up conditions, shortens the qualified time of propylene products, and improves economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the reflux system in the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the guard bed system in the present invention.

[0022] Figure numerals: 1-reflux system, 2-guard bed system, 3-reflux tank, 4-guard bed, 5-cooler, 6-propylene tank area, 7-A cross-line pipeline, 8-A pipeline, 9-B pipeline, 10-propylene distillation tower A condenser, 11-propylene distillation tower B condenser, 12-C pipeline, 13-D pipeline, 14-E pipeline, 15-F pipeline, 16-propylene distillation tower, 17-propylene distillation tower reflux pump, 18-B cross-line pipeline, 19-G pipeline, 20-H pipeline, 21-H pipeline, 22-H pipeline, 23-H pipeline, 24-H pipeline, 25-H pipeline, 26-H pipeline, 27-H pipeline, 28-H pipeline, 29-H pipeline, 30-H pipeline, 31-H pipeline, 32-H pipeline, 33-H pipeline, 34-H pipeline, 35-H pipeline, 36-H pipeline, 37-H pipeline, 38-H pipeline, 39-H pipeline, 40-H pipeline, 41-H pipeline, 42-H pipeline, 43-H pipeline, 44-H pipeline, 45-H pipeline, 46-H pipeline, 47-H pipeline, 48-H pipeline, 49-H pipeline, 50-H pipeline, 51-H pipeline, 52-H pipeline, 53-H pipeline, 54-H pipeline, 55-H pipeline, 56-H pipeline, 57-H pipeline, 58-H pipeline 1-Propylene product pump, 22-A blind plate, 23-B blind plate, 24-A valve, 25-B valve, 26-C valve, 27-D valve, 28-E valve, 29-F valve, 30-G valve, 31-H valve, 32-I valve, 33-C blind plate, 34-J valve, 35-K valve, 36-L valve, 37-M valve, 38-N valve, 39-P valve, 40-Q valve, 41-R valve, 42-C cross-line pipeline, 43-S valve.

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0024] Embodiment 1 of the present invention: A system that can accelerate the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, and the reflux tank 3 is connected to the cooler 5 pipeline.

[0025] Embodiment 2 of the present invention: A system for accelerating the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, the reflux tank 3 is connected to the cooler 5 pipeline; the reflux tank 3 is connected to the cooler 5 pipeline; The flow system 1 also includes a propylene distillation tower A condenser 10 and a propylene distillation tower B condenser 11, a C pipeline 12 and a D pipeline 13 are arranged between the propylene distillation tower A condenser 10 and the propylene distillation tower B condenser 11, an E pipeline 14 and an F pipeline 15 are arranged on the reflux tank 3, one end of the E pipeline 14 is connected to the reflux tank 3, the other end of the E pipeline 14 is connected to the D pipeline 13, one end of the F pipeline 15 is connected to the reflux tank 3, the other end of the F pipeline 15 is connected to the propylene distillation tower 16, and a propylene distillation tower reflux pump 17 is arranged on the F pipeline 15.

[0026] Embodiment 3 of the present invention: A system for accelerating the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, the reflux tank 3 is connected to the cooler 5 pipeline; the reflux system 1 also comprises a propylene A distillation tower A condenser 10 and a propylene distillation tower B condenser 11, a C pipeline 12 and a D pipeline 13 are arranged between the propylene distillation tower A condenser 10 and the propylene distillation tower B condenser 11, an E pipeline 14 and an F pipeline 15 are arranged on the reflux tank 3, one end of the E pipeline 14 is connected to the reflux tank 3, the other end of the E pipeline 14 is connected to the D pipeline 13, one end of the F pipeline 15 is connected to the reflux tank 3, the other end of the F pipeline 15 is connected to the propylene distillation tower 16, and a propylene distillation tower reflux pump 17 is arranged on the F pipeline 15; a B cross-line pipeline 18 is arranged on the B pipeline 9.

[0027] Embodiment 4 of the present invention: A system for accelerating the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, and the reflux tank 3 is connected to the cooler 5 pipeline; the reflux system 1 also comprises a propylene distillation tower A condenser 10 and a propylene distillation tower B condenser 11, and a C pipeline 12 and a D pipeline are arranged between the propylene distillation tower A condenser 10 and the propylene distillation tower B condenser 11 13, an E pipeline 14 and an F pipeline 15 are arranged on the reflux tank 3, one end of the E pipeline 14 is connected to the reflux tank 3, the other end of the E pipeline 14 is connected to the D pipeline 13, one end of the F pipeline 15 is connected to the reflux tank 3, the other end of the F pipeline 15 is connected to the propylene distillation tower 16, and the F pipeline 15 is provided with a propylene distillation tower reflux pump 17; the B pipeline 9 is provided with a B cross-line pipeline 18; the cooler 5 is provided with a G pipeline 19, one end of the G pipeline 19 is connected to the cooler 5, the other end of the G pipeline 19 is connected to the F pipeline 15, the G pipeline 19 is provided with an H pipeline 20, the inlet and outlet of the H pipeline 20 are both connected to the G pipeline 19, and the G pipeline 19 is provided with a propylene product pump 21, and the propylene product pump 21 is placed between the inlet and outlet of the H pipeline 20.

[0028] Embodiment 5 of the present invention: A system for accelerating the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, and the reflux tank 3 is connected to the cooler 5 pipeline; The reflux system 1 further includes a propylene distillation tower A condenser 10 and a propylene distillation tower B condenser 11, wherein a C pipeline 12 and a D pipeline 13 are arranged between the propylene distillation tower A condenser 10 and the propylene distillation tower B condenser 11, and an E pipeline 14 and an F pipeline 15 are arranged on the reflux tank 3, one end of the E pipeline 14 is connected to the reflux tank 3, and the other end of the E pipeline 14 is connected to the D pipeline 13, one end of the F pipeline 15 is connected to the reflux tank 3, and the other end of the F pipeline 15 is connected to the propylene distillation tower 16, and the F pipeline 15 is provided with a propylene distillation tower reflux pump 17; a B cross-line pipeline 18 is provided on the B pipeline 9; a G pipeline 19 is provided on the cooler 5, one end of the G pipeline 19 is connected to the cooler 5, and the other end of the G pipeline 19 is connected to the F pipeline 15, an H pipeline 20 is provided on the G pipeline 19, and the inlet and outlet of the H pipeline 20 are both connected to the G pipeline 19, and a propylene product pump 21 is provided on the G pipeline 19, and the propylene product pump 21 is placed between the inlet and outlet of the H pipeline 20; an A blind plate 22 is provided on the B pipeline 9, a B blind plate 23 is provided on the A cross-line pipeline 7, and the B pipeline 9 A valve 24, B valve 25, C valve 26, D valve 27, E valve 28 and F valve 29 are arranged in sequence, A blind plate 22 is placed on the pipe section between A valve 24 and B valve 25, G valve 30 is arranged on B cross-line pipeline 18, both ends of B cross-line pipeline 18 are placed on the pipe section between A blind plate 22 and B valve 25, F valve 29 is placed at one end close to protection bed 4, H valve 31 and I valve 32 are arranged in sequence on A cross-line pipeline 7, B blind plate 23 is placed on the pipe section between H valve 31 and I valve 32.

[0029] Embodiment 6 of the present invention: A system for accelerating the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, and the reflux tank 3 is connected to the cooler 5 pipeline; the reflux system 1 also comprises a propylene distillation tower A condenser 10 and a propylene distillation tower B Condenser 11, C pipeline 12 and D pipeline 13 are arranged between the propylene distillation tower A condenser 10 and the propylene distillation tower B condenser 11, E pipeline 14 and F pipeline 15 are arranged on the reflux tank 3, one end of E pipeline 14 is connected to the reflux tank 3, the other end of E pipeline 14 is connected to D pipeline 13, one end of F pipeline 15 is connected to the reflux tank 3, the other end of F pipeline 15 is connected to propylene distillation tower 16, and F pipeline 15 is arranged on propylene distillation tower reflux pump 17; B pipeline 9 is arranged on B cross-line pipeline 18; G pipeline 19 is arranged on cooler 5, one end of G pipeline 19 is connected to cooler 5, The other end of the G pipeline 19 is connected to the F pipeline 15, and the G pipeline 19 is provided with an H pipeline 20, and the inlet and outlet of the H pipeline 20 are both connected to the G pipeline 19. The G pipeline 19 is provided with a propylene product pump 21, and the propylene product pump 21 is placed between the inlet and outlet of the H pipeline 20; the B pipeline 9 is provided with an A blind plate 22, and the A cross-line pipeline 7 is provided with a B blind plate 23. The B pipeline 9 is provided with an A valve 24, a B valve 25, a C valve 26, a D valve 27, an E valve 28 and an F valve 29 in sequence, and the A blind plate 22 is placed on the pipe section between the A valve 24 and the B valve 25, and the B cross-line pipeline 18 is provided with a G valve. 30, both ends of the B cross-line pipeline 18 are placed on the pipe section between the A blind plate 22 and the B valve 25, the F valve 29 is placed at one end close to the protection bed 4, the A cross-line pipeline 7 is sequentially provided with the H valve 31 and the I valve 32, the B blind plate 23 is placed on the pipe section between the H valve 31 and the I valve 32; the H pipeline 20 is provided with a C blind plate 33, the G pipeline 19 is provided with a J valve 34, the H pipeline 20 is provided with a K valve 35 and an L valve 36, the C blind plate 33 is placed on the pipe section between the K valve 35 and the L valve 36, and one end of the G pipeline 19 is placed on the pipe section between the J valve 34 and the propylene product pump 21.

[0030] Embodiment 7 of the present invention: A system for accelerating the start-up of a propylene distillation tower, comprising a reflux system 1 and a guard bed system 2, wherein the reflux system 1 comprises a reflux tank 3, the guard bed system 2 comprises a guard bed 4, a cooler 5, a propylene tank area 6 and an A cross-line pipeline 7, an A pipeline 8 is arranged between the guard bed 4 and the cooler 5, a B pipeline 9 is arranged between the guard bed 4 and the propylene tank area 6, one end of the A cross-line pipeline 7 is connected to the A pipeline 8, and the other end of the A cross-line pipeline 7 is connected to the B pipeline 9, and the reflux tank 3 is connected to the cooler 5 pipeline; the reflux system 1 also comprises a propylene distillation tower A condenser 10 and a propylene distillation tower B condenser 11, and the propylene distillation tower A condenser 10 and the propylene distillation tower B condenser 11 are connected to each other. A C pipeline 12 and a D pipeline 13 are arranged between the condensers 11, an E pipeline 14 and an F pipeline 15 are arranged on the reflux tank 3, one end of the E pipeline 14 is connected to the reflux tank 3, and the other end of the E pipeline 14 is connected to the D pipeline 13, one end of the F pipeline 15 is connected to the reflux tank 3, and the other end of the F pipeline 15 is connected to a propylene distillation tower 16, and a propylene distillation tower reflux pump 17 is arranged on the F pipeline 15; a B cross-line pipeline 18 is arranged on the B pipeline 9; a G pipeline 19 is arranged on the cooler 5, one end of the G pipeline 19 is connected to the cooler 5, and the other end of the G pipeline 19 is connected to the F pipeline 15, and an H pipeline 20 is arranged on the G pipeline 19, and the inlet and outlet of the H pipeline 20 are both connected to the G pipeline 19, A propylene product pump 21 is provided on the G pipeline 19, and the propylene product pump 21 is placed between the inlet and outlet of the H pipeline 20; an A blind plate 22 is provided on the B pipeline 9, a B blind plate 23 is provided on the A cross-line pipeline 7, and an A valve 24, a B valve 25, a C valve 26, a D valve 27, an E valve 28 and an F valve 29 are provided on the B pipeline 9 in sequence, the A blind plate 22 is placed on the pipe section between the A valve 24 and the B valve 25, a G valve 30 is provided on the B cross-line pipeline 18, both ends of the B cross-line pipeline 18 are placed on the pipe section between the A blind plate 22 and the B valve 25, the F valve 29 is placed at one end close to the protection bed 4, an H valve 31 and an I valve 32 are provided on the A cross-line pipeline 7 in sequence, the B blind plate 2 3 is placed on the pipe section between the H valve 31 and the I valve 32; the H pipeline 20 is provided with a C blind plate 33, the G pipeline 19 is provided with a J valve 34, the H pipeline 20 is provided with a K valve 35 and an L valve 36, the C blind plate 33 is placed on the pipe section between the K valve 35 and the L valve 36, and one end of the G pipeline 19 is placed on the pipe section between the J valve 34 and the propylene product pump 21; the F pipeline 15 is sequentially provided with an M valve 37, an N valve 38, a P valve 39, a Q valve 40 and an R valve 41, the M valve 37 is placed at one end close to the reflux tank 3, the pipe section between the Q valve 40 and the R valve 41 is connected with a C cross-line pipeline 42, and the C cross-line pipeline 42 is provided with an S valve 43.

[0031] A method for accelerating the start-up of a propylene distillation tower comprises the following steps:

[0032] S1. Before starting work, make sure that the three blind plates A 22, B 23 and C 33 are in the open position, remove the valve core of the J valve 34 on the G pipeline 19, and ensure that all valves are in the closed state;

[0033] S2, liquid propylene enters the propylene product line in reverse through the minimum flow return line of the propylene pump in the propylene tank area 6 and reaches the pipeline boundary area of ​​the olefin separation unit. At this time, the A valve 24, the G valve 30, the B valve 25, the C valve 26, the D valve 27, the E valve 28, and the F valve 29 on the B cross-line pipeline 18 are slowly opened, and the liquid propylene reaches the outlet pipeline of the guard bed 4 via the B pipeline 9;

[0034] S3, slowly open the H valve 31 and the I valve 32 on the A cross-line pipeline 7, and the liquid propylene passes through the A cross-line pipeline 7 to the cooler 5;

[0035] S4, the liquid propylene passes through the cooler 5 in reverse, flows through the G pipeline 19 and the H pipeline 20 in sequence, and the pipeline K valve 35 and the L valve 36 are slowly opened, and the liquid propylene reaches the inlet pipeline of the propylene product pump 21;

[0036] S5, slowly open the pipeline M valve 37 and N valve 38, and the liquid propylene reaches the inlet of the propylene distillation tower reflux pump 17 and enters the reflux tank 3;

[0037] S6, when the liquid level of the reflux tank 3 is higher than 50%, start the propylene distillation tower reflux pump 17, and then slowly open the pipeline P valve 39, Q valve 40, S valve 43 and R valve 41 on the C cross-line pipeline 42 to introduce liquid propylene into the propylene distillation tower 16.

[0038] The working principle of an embodiment of the present invention is as follows: when the present invention is working, before starting, first confirm that the three blind plates A blind plate 22, B blind plate 23, and C blind plate 33 are in the open position, remove the valve core of the J valve 34 on the G pipeline 19, and ensure that all valves are in the closed state; liquid propylene enters the propylene product line in the reverse direction through the minimum flow return line of the propylene pump of the propylene tank area 6 to reach the pipeline boundary area of ​​the olefin separation device, and then slowly open the A valve 24, the G valve 30, the B valve 25, the C valve 26, the D valve 27, the E valve 28, and the F valve 29 on the B cross-line pipeline 18, and the liquid propylene reaches the outlet pipeline of the guard bed 4 via the B pipeline 9; slowly open the H valve 34 on the A cross-line pipeline 7 Valve 31, I valve 32, liquid propylene passes through A cross-line pipeline 7 before reaching cooler 5; liquid propylene passes through cooler 5 in reverse, flows through G pipeline 19 and H pipeline 20 in sequence, slowly open pipeline K valve 35, L valve 36, liquid propylene reaches the inlet pipeline of propylene product pump 21; slowly open pipeline M valve 37, N valve 38, liquid propylene reaches the inlet of propylene distillation tower reflux pump 17, and enters reflux tank 3; when the liquid level of reflux tank 3 is higher than 50%, start propylene distillation tower reflux pump 17, at this time slowly open pipeline P valve 39, Q valve 40, S valve 43, R valve 41 on C cross-line pipeline 42 to introduce liquid propylene into propylene distillation tower 16.

Claims

1. A method for accelerating the start-up of a propylene distillation tower, characterized in that: The invention comprises a reflux system (1) and a guard bed system (2), wherein the reflux system (1) comprises a reflux tank (3), the guard bed system (2) comprises a guard bed (4), a cooler (5), a propylene tank area (6) and an A cross-line pipeline (7), an A pipeline (8) is arranged between the guard bed (4) and the cooler (5), a B pipeline (9) is arranged between the guard bed (4) and the propylene tank area (6), one end of the A cross-line pipeline (7) is connected to the A pipeline (8), the other end of the A cross-line pipeline (7) is connected to the B pipeline (9), and the reflux tank (3) is connected to the cooler (5) pipeline; The reflux system (1) further comprises a propylene distillation tower A condenser (10) and a propylene distillation tower B condenser (11), a C pipeline (12) and a D pipeline (13) are arranged between the propylene distillation tower A condenser (10) and the propylene distillation tower B condenser (11), an E pipeline (14) and an F pipeline (15) are arranged on the reflux tank (3), one end of the E pipeline (14) is connected to the reflux tank (3), the other end of the E pipeline (14) is connected to the D pipeline (13), one end of the F pipeline (15) is connected to the reflux tank (3), the other end of the F pipeline (15) is connected to the propylene distillation tower (16), and a propylene distillation tower reflux pump (17) is arranged on the F pipeline (15); the B pipeline (9) is provided with a B cross-line pipeline (18); The cooler (5) is provided with a G pipeline (19), one end of which is connected to the cooler (5), and the other end of which is connected to the F pipeline (15). The G pipeline (19) is provided with an H pipeline (20), and the inlet and outlet of the H pipeline (20) are both connected to the G pipeline (19). The G pipeline (19) is provided with a propylene product pump (21), and the propylene product pump (21) is placed between the inlet and outlet of the H pipeline (20); The B pipeline (9) is provided with an A blind plate (22), the A cross-line pipeline (7) is provided with a B blind plate (23), the B pipeline (9) is provided with an A valve (24), a B valve (25), a C valve (26), a D valve (27), an E valve (28) and an F valve (29) in sequence, the A blind plate (22) is arranged on the pipe section between the A valve (24) and the B valve (25), the B cross-line pipeline (18) is provided with a G valve (30), both ends of the B cross-line pipeline (18) are arranged on the pipe section between the A blind plate (22) and the B valve (25), the F valve (29) is arranged at one end close to the protection bed (4), the A cross-line pipeline (7) is provided with an H valve (31) and an I valve (32) in sequence, the B blind plate (23) is arranged on the pipe section between the H valve (31) and the I valve (32); The H pipeline (20) is provided with a C blind plate (33), the G pipeline (19) is provided with a J valve (34), the H pipeline (20) is provided with a K valve (35) and an L valve (36), the C blind plate (33) is placed on the pipe section between the K valve (35) and the L valve (36), and one end of the G pipeline (19) is placed on the pipe section between the J valve (34) and the propylene product pump (21); The F pipeline (15) is provided with an M valve (37), an N valve (38), a P valve (39), a Q valve (40) and an R valve (41) in sequence, the M valve (37) being disposed at one end close to the reflux tank (3), the pipe section between the Q valve (40) and the R valve (41) being connected with a C cross-line pipeline (42), and the C cross-line pipeline (42) being provided with an S valve (43); The following steps are involved: S1. Before starting work, first confirm that the three blind plates A (22), B (23) and C (33) are in the open position, remove the valve core of the J valve (34) on the G pipe (19), and ensure that all valves are in the closed position; S2, liquid propylene enters the propylene product line in the reverse direction through the minimum flow return line of the propylene pump in the propylene tank area (6) and reaches the pipeline boundary area of ​​the olefin separation unit. At this time, the A valve (24), the G valve (30), the B valve (25), the C valve (26), the D valve (27), the E valve (28), and the F valve (29) on the B cross-line pipeline (18) are slowly opened, and the liquid propylene reaches the outlet pipeline of the guard bed (4) via the B pipeline (9); S3, slowly open the H valve (31) and the I valve (32) on the A cross-line pipeline (7), and the liquid propylene passes through the A cross-line pipeline (7) to the front of the cooler (5); S4, the liquid propylene passes through the cooler (5) in the reverse direction, and flows through the G pipeline (19) and the H pipeline (20) in sequence, and the pipeline K valve (35) and the L valve (36) are slowly opened, and the liquid propylene reaches the inlet pipeline of the propylene product pump (21); S5, slowly open the pipeline M valve (37) and N valve (38), and the liquid propylene reaches the inlet of the propylene distillation tower reflux pump (17) and enters the reflux tank (3); S6, when the liquid level in the reflux tank (3) is higher than 50%, the reflux pump (17) of the propylene distillation tower is started, and at this time, the pipeline P valve (39), Q valve (40), S valve (43) and R valve (41) on the C cross-line pipeline (42) are slowly opened to introduce liquid propylene into the propylene distillation tower (16).

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