PX distillation outlet heat energy recovery system
By designing a PX distillation outlet heat recovery system and utilizing the linkage between the finished product tower and the reforming oil tower, dual-system heat exchange was achieved, solving the problems of high PX distillation outlet temperature and external heating of reforming oil material in the reforming oil tower, thus realizing efficient energy utilization.
Patent Information
- Application Number
- CN202423200897.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-25
AI Technical Summary
In existing technologies, the high temperature at the PX distillation outlet leads to energy waste, and the additional heating of reforming oil material outside the reforming tower also consumes energy.
Design a PX distillation outlet heat recovery system to achieve dual-system heat exchange and save energy by linking components such as the finished product tower, centrifugal pump, heat exchanger, air-cooled variable frequency drive and reforming oil tower.
By using a dual-system heat exchange, the use of water-cooled heat exchangers is reduced, air-cooling power consumption is lowered, steam costs are saved, and energy efficiency is achieved.
Smart Images
Figure CN223774321U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of chemical technology, especially a PX distillation outlet heat energy recovery system. BACKGROUND
[0002] The product tower system PX distillation outlet temperature is high, after heat exchanger, frequency conversion air cooling and water cooling heat exchange is reduced to 30-40 DEG C, enters the PX tank area, waste energy, the reforming oil tower outside the tower needs to be heated to 90 DEG C after passing through the steam heat exchanger, and is heated to 110 DEG C with the heat exchanger E802 with the self-produced reforming oil 90 DEG C into the tower, energy consumption. UTILITY MODEL CONTENTS
[0003] In view of above problem, the purpose of the present application is to provide a PX distillation outlet heat energy recovery system, so that it can realize double system heat exchange and save energy consumption.
[0004] In order to achieve the above part or all purposes or other purposes, the present application provides the following technical scheme: a PX distillation outlet heat energy recovery system, characterized by comprising a product tower, a first centrifugal pump, a first heat exchanger, a second heat exchanger, air cooling frequency conversion, a reforming oil tower, a second centrifugal pump, a third heat exchanger, a steam heat exchanger and a PX tank area;The bottom outlet pipeline of the product tower is connected to the inlet pipeline of the first centrifugal pump, the outlet pipeline of the first centrifugal pump is connected to the first inlet pipeline of the first heat exchanger, the first outlet pipeline of the first heat exchanger is connected to the first inlet pipeline of the second heat exchanger, the first outlet pipeline of the second heat exchanger is connected to the inlet pipeline of the air cooling frequency conversion, and the outlet pipeline of the air cooling frequency conversion is connected to the PX tank area;The second inlet pipeline of the second heat exchanger is connected to the outside of the reforming oil, the second outlet pipeline of the second heat exchanger is connected to the inlet pipeline of the steam heat exchanger, the outlet pipeline of the steam heat exchanger is connected to the second inlet pipeline of the third heat exchanger, the second inlet pipeline of the third heat exchanger is connected to the self-produced reforming oil, and the second outlet pipeline of the third heat exchanger is connected to the inlet pipeline of the reforming oil tower;The bottom outlet pipeline of the reforming oil tower is connected to the inlet pipeline of the second centrifugal pump, the outlet pipeline of the second centrifugal pump is connected to the first inlet pipeline of the third heat exchanger, and the first outlet pipeline of the third heat exchanger is discharged.
[0005] Further, the second inlet pipeline of the first heat exchanger is connected to the inlet pipeline of the product tower.
[0006] Further, it further includes a first cut-off valve and a second cut-off valve;The bottom outlet pipeline of the product tower is connected to the first cut-off valve;The bottom outlet pipeline of the reforming oil tower is connected to the second cut-off valve.
[0007] Further, it further includes a regulating valve;The outlet pipeline of the air cooling frequency conversion is connected to the regulating valve.
[0008] Further, the first inlet temperature of the first heat exchanger is 160-170 DEG C, the first outlet temperature of the first heat exchanger is 140-150 DEG C, the outlet pipeline temperature of the air cooling frequency conversion is 30-40 DEG C, the second inlet pipeline temperature of the second heat exchanger is 20-30 DEG C, and the second outlet pipeline temperature of the second heat exchanger is 80-90 DEG C.
[0009] Further, the second inlet temperature of the first heat exchanger is 120-130 DEG C, and the second outlet temperature of the first heat exchanger is 140 DEG C.
[0010] Further, the self-produced reforming oil temperature is 90 DEG C, the outlet pipeline temperature of the steam heat exchanger is 90 DEG C, the second outlet pipeline temperature of the third heat exchanger is 110 DEG C, and the first inlet pipeline temperature of the third heat exchanger is 160 DEG C.
[0011] Further, the external supplement reforming oil is 60t / h.
[0012] Compared with the prior art, the beneficial effects of the utility model are that the product tower system PX distillation needs to be cooled, the reforming oil tower external supplement reforming oil material needs to be heated, and double-system heat exchange can be realized, so that energy consumption is saved. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a structure schematic view of the utility model;
[0014] Figure 2 It is a structure schematic view of the product tower system;
[0015] Figure 3 It is a structure schematic view of the reforming oil tower system;
[0016] In the drawing: 1, product tower; 2, first centrifugal pump; 3, first heat exchanger; 4, second heat exchanger; 5, air cooling frequency conversion; 6, reforming oil tower; 7, second centrifugal pump; 8, third heat exchanger; 9, steam heat exchanger; 101, first cut-off valve; 102, regulating valve; 103, second cut-off valve; 11, water-cooled heat exchanger. DETAILED DESCRIPTION
[0017] In order to make the structure and function of the utility model more clear, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment.
[0018] Referring to the drawings, Figures 1-2The utility model provides a PX distillation port heat energy recovery system, characterized in it includes product tower 1, no. 1 centrifugal pump 2, no. 1 heat exchanger 3, no. 2 heat exchanger 4, air cooling frequency conversion 5, reforming oil tower 6, no. 2 centrifugal pump 7, no. 3 heat exchanger 8, steam heat exchanger 9 and PX tank area, the bottom outlet pipeline of product tower 1 is connected with the inlet pipeline of no. 1 centrifugal pump 2, the outlet pipeline of no. 1 centrifugal pump 2 is connected with no. 1 inlet pipeline of no. 1 heat exchanger 3, no. 1 outlet pipeline of no. 1 heat exchanger 3 is connected with no. 1 inlet pipeline of no. 2 heat exchanger 4, no. 1 outlet pipeline of no. 2 heat exchanger 4 is connected with the inlet pipeline of air cooling frequency conversion 5, and the outlet pipeline of air cooling frequency conversion 5 is connected to PX tank area, the no. 2 inlet pipeline of no. 2 heat exchanger 4 is connected with the outside supplement reforming oil, the no. 2 outlet pipeline of no. 2 heat exchanger 4 is connected with the inlet pipeline of steam heat exchanger 9, the outlet pipeline of steam heat exchanger 9 is connected with the no. 2 inlet pipeline of no. 3 heat exchanger 8, the no. 2 inlet pipeline of no. 3 heat exchanger 8 is connected with the inlet pipeline of reforming oil tower 6, the bottom outlet pipeline of reforming oil tower 6 is connected with the inlet pipeline of no. 2 centrifugal pump 7, the outlet pipeline of no. 2 centrifugal pump 7 is connected with the no. 1 inlet pipeline of no. 3 heat exchanger 8, and the no. 1 outlet pipeline of no. 3 heat exchanger 8 is connected with the inlet pipeline of reforming oil tower 6.
[0019] Further, the no. 2 inlet pipeline of no. 1 heat exchanger 3 is connected with the inlet pipeline of product tower 1.
[0020] Further, it further includes no. 1 cut-off valve 101 and no. 2 cut-off valve 103, and the bottom outlet pipeline of product tower 1 is connected with no. 1 cut-off valve 101, and the bottom outlet pipeline of reforming oil tower 6 is connected with no. 2 cut-off valve 103.
[0021] Further, it further includes regulating valve 102, and the outlet pipeline of air cooling frequency conversion 5 is connected with regulating valve 102.
[0022] Further, the no. 1 inlet temperature of no. 1 heat exchanger 3 is 160-170 DEG C, the no. 1 outlet temperature of no. 1 heat exchanger 3 is 140-150 DEG C, the outlet pipeline temperature of air cooling frequency conversion 5 is 30-40 DEG C, the no. 2 inlet pipeline temperature of no. 2 heat exchanger 4 is 20-30 DEG C, and the no. 2 outlet pipeline temperature of no. 2 heat exchanger 4 is 80-90 DEG C.
[0023] Further, the no. 2 inlet temperature of no. 1 heat exchanger 3 is 120-130 DEG C, and the no. 2 outlet temperature of no. 1 heat exchanger 3 is 140 DEG C.
[0024] Further, the temperature of self-produced reforming oil is 90 DEG C, the outlet pipeline temperature of steam heat exchanger 9 is 90 DEG C, the no. 2 outlet pipeline temperature of no. 3 heat exchanger 8 is 110 DEG C, and the no. 1 inlet pipeline temperature of no. 3 heat exchanger 8 is 160 DEG C.
[0025] Furthermore, the externally supplied reforming oil is 60t / h.
[0026] When the finished product tower system and the reforming oil tower system operate separately, the PX distillate outlet of the finished product tower system has a flow rate of 83 t / h and a temperature of 160-170℃. After being heated to 140-150℃ by the feed heat exchanger, it is then cooled to 70-80℃ by the variable frequency air cooler 5, and then further cooled to 30-40℃ by the water-cooled heat exchanger 11 before entering the PX tank area. The reforming oil tower system receives 60 t / h of externally supplied reforming oil at a temperature of 20-30℃. After being heated to 90℃ by the steam heat exchanger 9, it is combined with the self-produced reforming oil at 90℃ and heated to 110℃ by the No. 3 heat exchanger 8 before entering the tower.
[0027] When the finished product tower system and the reforming oil tower system are operated together, the following energy-saving measures are achieved: 1. Not using the water-cooled heat exchanger saves RMB 8,000 per year; 2. Using the air-cooled inverter saves approximately RMB 28,500 per year in electricity costs; 3. Disabling the external reforming oil steam heat exchanger saves approximately RMB 894,100 per year in steam costs.
[0028] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.
Claims
1. A PX distillation outlet heat recovery system, characterized in that: The system includes a finished product tower (1), a first centrifugal pump (2), a first heat exchanger (3), a second heat exchanger (4), an air-cooled variable frequency drive (5), a reforming oil tower (6), a second centrifugal pump (7), a third heat exchanger (8), a steam heat exchanger (9), and a PX tank area. The bottom outlet pipeline of the finished product tower (1) is connected to the inlet pipeline of the first centrifugal pump (2), the outlet pipeline of the first centrifugal pump (2) is connected to the first inlet pipeline of the first heat exchanger (3), the first outlet pipeline of the first heat exchanger (3) is connected to the first inlet pipeline of the second heat exchanger (4), the first outlet pipeline of the second heat exchanger (4) is connected to the inlet pipeline of the air-cooled variable frequency drive (5), and the outlet pipeline of the air-cooled variable frequency drive (5) is connected to the PX tank. The second inlet pipeline of the second heat exchanger (4) is connected to the externally supplied reforming oil, the second outlet pipeline of the second heat exchanger (4) is connected to the inlet pipeline of the steam heat exchanger (9), the outlet pipeline of the steam heat exchanger (9) is connected to the second inlet pipeline of the third heat exchanger (8), the second inlet pipeline of the third heat exchanger (8) is connected to the self-produced reforming oil, the second outlet pipeline of the third heat exchanger (8) is connected to the inlet pipeline of the reforming oil tower (6); the bottom outlet pipeline of the reforming oil tower (6) is connected to the inlet pipeline of the second centrifugal pump (7), the outlet pipeline of the second centrifugal pump (7) is connected to the first inlet pipeline of the third heat exchanger (8), and the first outlet pipeline of the third heat exchanger (8) discharges the material.
2. The PX distillation outlet heat recovery system according to claim 1, characterized in that: The No. 2 inlet pipeline of the No. 1 heat exchanger (3) is fed, and the No. 2 outlet pipeline of the No. 1 heat exchanger (3) is connected to the inlet pipeline of the finished product tower (1).
3. The PX distillation outlet heat recovery system according to claim 1, characterized in that: It also includes a first shut-off valve (101) and a second shut-off valve (103); the first shut-off valve (101) is connected to the bottom outlet pipeline of the finished product tower (1); the second shut-off valve (103) is connected to the bottom outlet pipeline of the reforming oil tower (6).
4. The PX distillation outlet heat recovery system according to claim 1, characterized in that: It also includes a regulating valve (102); the regulating valve (102) is connected to the outlet pipeline of the air-cooled inverter (5).
5. A PX distillation outlet heat recovery system according to claim 1, characterized in that: The first inlet temperature of the first heat exchanger (3) is 160-170℃, and the first outlet temperature of the first heat exchanger (3) is 140-150℃; the outlet pipeline temperature of the air-cooled frequency converter (5) is 30-40℃; the second inlet pipeline temperature of the second heat exchanger (4) is 20-30℃, and the second outlet pipeline temperature of the second heat exchanger (4) is 80-90℃.
6. A PX distillation outlet heat recovery system according to claim 2, characterized in that: The second inlet temperature of the first heat exchanger (3) is 120-130℃, and the second outlet temperature of the first heat exchanger (3) is 140℃.
7. A PX distillation outlet heat recovery system according to claim 1, characterized in that: The temperature of the self-produced reforming oil is 90°C; the temperature of the outlet pipeline of the steam heat exchanger (9) is 90°C; the temperature of the second outlet pipeline of the third heat exchanger (8) is 110°C; and the temperature of the first inlet pipeline of the third heat exchanger (8) is 160°C.
8. A PX distillation outlet heat recovery system according to claim 1, characterized in that: The externally supplied reforming oil capacity is 60t / h.