Cross-line system for outlet of reflux pump of C4 and C5 separation tower
By adding a cross-line system to the outlet of the reflux pump in the C4-C5 separation tower, the energy waste problem of the top reflux pump and the top delivery pump was solved, achieving the effect of energy saving and consumption reduction.
Patent Information
- Application Number
- CN202520143773.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-01-22
AI Technical Summary
The existing C4 and C5 separation towers consume a lot of energy in their top reflux pumps and top transfer pumps, resulting in energy waste.
A cross-line system for the outlet of the reflux pump of a C4-C5 separation tower was designed. A cross-line was added between the outlet of the top reflux pump and the top delivery pump, and the two are connected by a cross-line valve. The flow rate and head of the top reflux pump are relatively large, with sufficient margin, and it can fully undertake the work of reflux and delivery of C4 products.
Energy conservation and consumption reduction were achieved by shutting down the tower top conveying pump, saving electricity and reducing energy consumption.
Smart Images
Figure CN223901240U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of chemical technology, especially carbon four carbon five separation tower reflux pump export cross line system. BACKGROUND
[0002] The raw material of the carbon four carbon five separation tower comes from the material before the ethylene debutanizer at present, first after heat exchange through the newly added carbon four carbon five separation tower bottom discharge / feed heat exchanger, enters the carbon four carbon five separation tower, and the carbon four and above components, carbon five and below components are separated through the tower. The carbon four carbon five separation tower top gas phase is carbon four fraction, after condensation through the tower top condenser, the condensate enters the tower top reflux tank, a part is beaten back through the tower top reflux pump, and the other part is sent out of the device as carbon four product; the tower top reflux pump and the tower top conveying pump are operated at the same time, and energy is consumed. UTILITY MODEL CONTENT
[0003] In view of the above problems, the purpose of the present application is to provide a carbon four carbon five separation tower reflux pump export cross line system, so that the tower top reflux pump can completely undertake the reflux and carbon four product delivery work, and energy consumption is saved.
[0004] In order to achieve part or all of the above purposes or other purposes, the present application provides the following technical scheme: a carbon four carbon five separation tower reflux pump export cross line system, comprising a heat exchanger, a carbon four carbon five separation tower, a tower top condenser, a tower top reflux tank, a tower top reflux pump and a tower top conveying pump; the bottom of the heat exchanger is connected to the material before the ethylene debutanizer, the top outlet of the heat exchanger is connected to the carbon four carbon five separation tower, the top outlet of the carbon four carbon five separation tower is connected to the tower top condenser and the tower top reflux tank respectively, the outlet of the tower top condenser is connected to the tower top reflux tank, the No. 1 outlet of the tower top reflux tank is connected to the tower top reflux pump and the tower top conveying pump respectively, the outlet of the tower top reflux pump is connected to the carbon four carbon five separation tower through a reflux pipeline, the outlet of the tower top conveying pump is conveyed to the carbon four tank area through a conveying pipeline, a cross line is arranged between the reflux pipeline and the conveying pipeline, and a cross line valve is arranged on the cross line.
[0005] Further, the top outlet of the heat exchanger is connected to three inlets of the carbon four carbon five separation tower through three pipelines in parallel.
[0006] Further, the bottom outlet of the carbon four carbon five separation tower is connected to the cooling inlet of the heat exchanger, the cooling outlet of the heat exchanger is connected to the carbon five cooler, the outlet of the carbon five cooler is connected to the tower bottom pump, and the outlet of the tower bottom pump is connected to the cracked gasoline hydrogenation raw material tank area.
[0007] Further, the carbon four carbon five separation tower bottom part outlet is also connected to the tower bottom reboiler bottom part inlet, the tower bottom reboiler top part outlet is connected to the carbon four carbon five separation tower, the tower bottom reboiler is connected to the reboiler import pipeline and the reboiler export pipeline, the reboiler import pipeline inputs medium pressure steam, the reboiler export pipeline exports medium pressure condensate, and a valve is arranged on the reboiler import pipeline and the reboiler export pipeline respectively.
[0008] Further, the No. 2 outlet of the overhead reflux tank is connected to a flare.
[0009] Compared with the prior art, the beneficial effects of the present application are that a cross line is added between the outlet of the overhead reflux pump and the outlet of the overhead conveying pump, the overhead conveying pump can be stopped after being connected, the flow and head of the overhead reflux pump are larger, the remaining amount is sufficient, the overhead reflux pump can completely undertake the reflux and carbon four product delivery work, and energy consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the present application;
[0011] In the figure: 1, heat exchanger, 2, carbon four carbon five separation tower, 3, overhead condenser, 4, overhead reflux tank, 5, overhead reflux pump, 6, overhead conveying pump, 7, carbon five cooler, 8, tower bottom pump, 9, carbon four tank area, 10, cracked gasoline hydrogenation raw material tank area, 11, reflux pipeline, 12, conveying pipeline, 13, cross line, 14, cross line valve, 15, tower bottom reboiler, 16, reboiler import pipeline, 17, reboiler export pipeline. DETAILED DESCRIPTION
[0012] In order to make the structure and function of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.
[0013] Referring to the drawings, Figure 1 , the carbon four carbon five separation tower reflux pump outlet cross line system comprises a heat exchanger 1, a carbon four carbon five separation tower 2, an overhead condenser 3, an overhead reflux tank 4, an overhead reflux pump 5 and an overhead conveying pump 6; the bottom part of the heat exchanger 1 is connected to the material before an ethylene debutanizer, the top part outlet of the heat exchanger 1 is connected to the carbon four carbon five separation tower 2, the top part outlet of the carbon four carbon five separation tower 2 is respectively connected to the overhead condenser 3 and the overhead reflux tank 4, the outlet of the overhead condenser 3 is connected to the overhead reflux tank 4, the No. 1 outlet of the overhead reflux tank 4 is respectively connected to the overhead reflux pump 5 and the overhead conveying pump 6, the outlet of the overhead reflux pump 5 is connected to the carbon four carbon five separation tower 2 through a reflux pipeline 11, the outlet of the overhead conveying pump 6 is conveyed to the carbon four tank area 9 through a conveying pipeline 12, a cross line 13 is arranged between the reflux pipeline 11 and the conveying pipeline 12, and a cross line valve 14 is arranged on the cross line 13.
[0014] The top outlet of the heat exchanger 1 is connected to three inlets of the C4 / C5 separation column 2 through three pipelines in parallel.
[0015] The bottom outlet of the C4 / C5 separation column 2 is connected to the cooling inlet of the heat exchanger 1, the cooling outlet of the heat exchanger 1 is connected to the C5 cooler 7, the outlet of the C5 cooler 7 is connected to the bottom pump 8, and the outlet of the bottom pump 8 is connected to the cracked gasoline hydrogenation feed tank area 10; the C5 product in the bottom liquid phase of the C4 / C5 separation column 2 is cooled in sequence by the C4 / C5 separation column bottom discharge / charge heat exchanger and the C5 product cooler, and then sent to the cracked gasoline hydrogenation feed tank area 10 after being pressurized by the bottom pump.
[0016] The bottom outlet of the C4 / C5 separation column 2 is also connected to the bottom inlet of the bottom reboiler 15, and the top outlet of the bottom reboiler 15 is connected to the C4 / C5 separation column 2; the bottom reboiler 15 is connected to the reboiler inlet pipeline 16 and the reboiler outlet pipeline 17, the reboiler inlet pipeline 16 inputs medium-pressure steam, and the reboiler outlet pipeline 17 outputs medium-pressure condensate, and a valve is arranged on each of the reboiler inlet pipeline 16 and the reboiler outlet pipeline 17.
[0017] The No. 2 outlet of the overhead reflux tank 4 is connected to a flare.
[0018] Based on the above technical solution, the purpose is to save device power: the motor power of the overhead pump 6 is 30 KW, and after the overhead pump 6 is stopped, the energy saving and power saving is 26.28 million degrees / year*0.5 yuan / degree=1.314 million yuan / year.
[0019] The above only discloses the preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application, so the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.
Claims
1. A cross-line system for the outlet of the reflux pump of a C4 / C5 separation tower, characterized in that: The system includes a heat exchanger (1), a C4 / C5 separation tower (2), a tower top condenser (3), a tower top reflux tank (4), a tower top reflux pump (5), and a tower top delivery pump (6). The bottom of the heat exchanger (1) is fed with material from before the ethylene debutane tower. The top outlet of the heat exchanger (1) is connected to the C4 / C5 separation tower (2). The top outlet of the C4 / C5 separation tower (2) is connected to the tower top condenser (3) and the tower top reflux tank (4), respectively. The outlet of the tower top condenser (3) is connected to the tower top reflux tank. The reflux tank (4) at the top of the tower is connected to the top reflux pump (5) and the top delivery pump (6) respectively. The outlet of the top reflux pump (5) is connected to the C4 and C5 separation tower (2) through the reflux pipeline (11). The outlet of the top delivery pump (6) is delivered to the C4 tank area (9) through the delivery pipeline (12). A cross line (13) is set between the reflux pipeline (11) and the delivery pipeline (12). A cross line valve (14) is set on the cross line (13).
2. The C4 / C5 separation tower reflux pump outlet cross-line system according to claim 1, characterized in that: The top outlet of the heat exchanger (1) is connected to the three inlets of the C4-C5 separation tower (2) via three parallel pipelines.
3. The C4 / C5 separation tower reflux pump outlet cross-line system according to claim 1, characterized in that: The bottom outlet of the C4-C5 separation tower (2) is connected to the cooling inlet of the heat exchanger (1), the cooling outlet of the heat exchanger (1) is connected to the C5 cooler (7), the outlet of the C5 cooler (7) is connected to the bottom pump (8), and the outlet of the bottom pump (8) is connected to the cracked gasoline hydrogenation feedstock tank area (10).
4. The C4 / C5 separation tower reflux pump outlet cross-line system according to claim 1, characterized in that: The bottom outlet of the C4-C5 separation tower (2) is also connected to the bottom inlet of the reboiler (15) at the bottom of the tower. The top outlet of the reboiler (15) at the bottom of the tower is connected to the C4-C5 separation tower (2). The reboiler (15) at the bottom of the tower is connected to the reboiler inlet pipeline (16) and the reboiler outlet pipeline (17). The reboiler inlet pipeline (16) inputs medium-pressure steam, and the reboiler outlet pipeline (17) outputs medium-pressure condensate. A valve is installed on the reboiler inlet pipeline (16) and the reboiler outlet pipeline (17).
5. The C4 / C5 separation tower reflux pump outlet cross-line system according to claim 1, characterized in that: The second outlet of the top reflux tank (4) is connected to the flare.