Rectifying tower top waste heat system
By adding bypass pipelines and valves to the waste heat system at the top of the distillation column, the problem of waste heat power generation shutdown caused by condensate preheater leakage was solved. This enabled the separate disconnection of the condensate preheater and continuous recovery of waste heat, ensuring the normal operation of waste heat power generation.
Patent Information
- Application Number
- CN202423204330.0
- 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 a top-phase waste heat power generation facility at the top of a distillation column, when the condensate preheater tube bundle leaks, the condensate will enter the oil system, causing the distillation column to malfunction and requiring shutdown for maintenance. The waste heat cannot be recovered, resulting in heat loss.
A waste heat system was designed at the top of the distillation column. By adding bypass pipelines and valves before and after the condensate preheater, the condensate preheater can be isolated to ensure the normal operation of waste heat power generation. The system is connected to the steam generators of the extraction liquid tower and the residual liquid tower to ensure the steam supply. The oil side is returned to the reflux tank through the bypass, realizing bidirectional use.
During the maintenance of the condensate preheater, the waste heat power generation was ensured to continue without interruption, thus achieving continuous recovery and utilization of waste heat and avoiding heat loss.
Smart Images
Figure CN223774338U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of distillation column technology, and in particular to the waste heat system at the top of distillation columns. Background Technology
[0002] The distillation column has a waste heat power generation facility in the top vapor phase. When the condensate preheater tube bundle leaks, the condensate will enter the oil system, causing the distillation column to malfunction. All evaporators need to be shut down, the waste heat power generation facility needs to be stopped, the process needs to be handled, and the condensate preheater needs to be repaired. During this period, the waste heat at the top of each distillation column cannot be recovered and utilized, resulting in heat loss. Utility Model Content
[0003] In view of the above problems, the purpose of this application is to provide a waste heat system at the top of a distillation column, which enables the condensate preheater to be disconnected separately without affecting the operation of waste heat power generation, thus saving energy.
[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a distillation column top waste heat system, including an extractant column, an extractant column top pipeline, an extractant column top steam generator, an extractant column top condensate preheater, an extractant column top reflux tank, a condensate main pipeline, a first condensate branch pipeline, a second condensate branch pipeline, a raffinate column top steam generator, a raffinate column top condensate preheater, a raffinate column top reflux tank, a raffinate column top pipeline, and a cross-line pipeline; the top outlet of the extractant column is connected to the inlet of the extractant column top pipeline, and the extractant column top steam generator is sequentially connected to the extractant column top pipeline. The system includes a generator, a condensate preheater at the top of the extractable liquid tower, and a reflux tank at the top of the extractable liquid tower. The main condensate pipeline is connected to the inlet of the first condensate branch pipeline and the inlet of the second condensate branch pipeline. The first condensate branch pipeline is sequentially connected to the condensate preheater at the top of the extractable liquid tower and the steam generator at the top of the extractable liquid tower. The reflux tank at the top of the reflux tower is sequentially connected to the steam generator at the top of the reflux tower, the condensate preheater at the top of the reflux tower, and the reflux tank at the top of the reflux tower. The first and second condensate branch pipelines are connected via a cross-line pipeline.
[0005] Furthermore, the top pipeline of the extraction liquid tower is connected to the inlet of the bypass pipeline of the extraction liquid tower preheater. The inlet of the bypass pipeline of the extraction liquid tower preheater is located before the condensate preheater at the top of the extraction liquid tower, and the outlet of the bypass pipeline of the extraction liquid tower preheater is located after the condensate preheater at the top of the extraction liquid tower.
[0006] Furthermore, the top pipeline of the evaporator is connected to the inlet of the bypass pipeline of the evaporator preheater. The inlet of the bypass pipeline of the evaporator preheater is located before the condensate preheater at the top of the evaporator, and the outlet of the bypass pipeline of the evaporator preheater is located after the condensate preheater at the top of the evaporator.
[0007] Furthermore, a first valve and a first drain are sequentially connected to the first condensate branch pipeline, with the first valve and the first drain being close to the inlet of the first condensate branch pipeline; a second valve and a second drain are sequentially connected to the second condensate branch pipeline, with the second valve and the second drain being close to the inlet of the second condensate branch pipeline; a third valve and a third drain are installed on the cross-line pipeline near the second condensate branch pipeline, and a fourth valve is installed on the cross-line pipeline near the first condensate branch pipeline.
[0008] Furthermore, a No. 5 valve is installed on the first condensate branch pipeline, and the No. 5 valve is located between the condensate preheater at the top of the outlet tower and the cross-line pipeline; a No. 6 valve is installed on the top pipeline of the extraction tower, and the No. 6 valve is located between the inlet of the bypass pipeline of the extraction tower preheater and the condensate preheater at the top of the outlet tower; a No. 7 valve is installed on the top pipeline of the extraction tower, and the No. 7 valve is located between the condensate preheater at the top of the outlet tower and the outlet of the bypass pipeline of the extraction tower preheater.
[0009] Furthermore, valve No. 8 is installed on the second condensate branch pipeline, and valve No. 8 is located between the condensate preheater at the top of the evaporator and the cross-line pipeline; valve No. 9 is installed on the pipeline at the top of the evaporator, and valve No. 9 is located between the bypass pipeline of the evaporator preheater and the condensate preheater at the top of the evaporator; valve No. 10 is installed on the pipeline at the top of the evaporator, and valve No. 10 is located between the condensate preheater at the top of the evaporator and the bypass pipeline of the evaporator preheater.
[0010] Furthermore, an air cooler is installed on the top pipeline of the extraction tower near the top outlet of the extraction tower.
[0011] Furthermore, the top outlet of the steam generator at the top of the extraction tower is connected to the steam main of the steam turbine.
[0012] Furthermore, a No. 1 water inlet valve is installed on the first condensate branch pipeline, and the No. 1 water inlet valve is located between the cross-line pipeline and the steam generator at the top of the extractive liquid tower; a No. 1 preheater bypass valve is installed on the preheater bypass pipeline of the extractive liquid tower; a No. 2 water inlet valve is installed on the second condensate branch pipeline, and the No. 2 water inlet valve is located between the cross-line pipeline and the steam generator at the top of the residual liquid tower; a No. 2 preheater bypass valve is installed on the preheater bypass pipeline of the residual liquid tower; and a shut-off valve to the evaporator is installed on the top pipeline of the extractive liquid tower.
[0013] Furthermore, the top pipeline of the extraction liquid tower is connected to the oil side of the condensate preheater at the top of the extraction liquid tower, and the first condensate branch pipeline is connected to the water side of the condensate preheater at the top of the extraction liquid tower; the top pipeline of the residual liquid tower is connected to the oil side of the condensate preheater at the top of the residual liquid tower, and the second condensate branch pipeline is connected to the water side of the condensate preheater at the top of the residual liquid tower.
[0014] Compared with the prior art, the beneficial effects of this utility model are: the addition of a gate valve at the water-side outlet of each condensate preheater and the addition of pipelines, valves, and drains between them allows for bidirectional use. For example, during the maintenance and shutdown of the condensate preheater 4 at the top of the extraction liquid tower, water can be supplied to the steam generator 3 at the top of the extraction liquid tower through the condensate preheater 10 at the top of the extraction liquid tower, ensuring the gas production of the steam generator 3 at the top of the extraction liquid tower. The oil side can bypass the condensate preheater 4 at the top of the extraction liquid tower and return to the reflux tank 5 at the top of the extraction liquid tower, thereby ensuring the normal operation of waste heat power generation without shutdown. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] In the diagram: 1. Extraction tank; 2. Top pipeline of extraction tank; 3. Steam generator at the top of extraction tank; 4. Condensate preheater at the top of extraction tank; 5. Return tank at the top of extraction tank; 6. Main condensate pipeline; 7. First condensate branch pipeline; 8. Second condensate branch pipeline; 9. Steam generator at the top of extraction tank; 10. Condensate preheater at the top of extraction tank; 11. Return tank at the top of extraction tank; 12. Top pipeline of extraction tank; 13. Pipeline No. 1; 14. Bypass pipeline of extraction tank preheater; 15. Bypass pipeline of extraction tank preheater; 16. Top space of extraction tank. Cooler, 17. Steam main of steam turbine, 101. Valve No. 1, 102. Valve No. 2, 103. Valve No. 3, 104. Valve No. 4, 105. Valve No. 5, 106. Valve No. 6, 107. Valve No. 7, 108. Valve No. 8, 109. Valve No. 9, 110. Valve No. 10, 201. Drain No. 1, 202. Drain No. 2, 203. Drain No. 3, 301. Water supply valve No. 1, 302. Preheater No. 1 bypass valve, 303. Water supply valve No. 2, 304. Preheater No. 2 bypass valve, 305. Shut-off valve to evaporator. Detailed Implementation
[0017] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0018] See appendix Figure 1The distillation column top waste heat system includes an extractor column 1, an extractor column top pipeline 2, an extractor column top steam generator 3, an extractor column top condensate preheater 4, an extractor column top reflux tank 5, a condensate main pipeline 6, a first condensate branch pipeline 7, a second condensate branch pipeline 8, a raffinate column top steam generator 9, a raffinate column top condensate preheater 10, a raffinate column top reflux tank 11, a raffinate column top pipeline 12, and a cross-line pipeline 13. The top outlet of the extractor column 1 is connected to the inlet of the extractor column top pipeline 2. The extractor column top pipeline 2 is sequentially connected to the extractor column top steam generator 3, the extractor column top condensate preheater 4, and the raffinate main pipeline 5. The condensate tower top reflux tank 5 is connected to the main condensate pipeline 6, which is connected to the inlet of the first condensate branch pipeline 7 and the inlet of the second condensate branch pipeline 8. The first condensate branch pipeline 7 is connected in sequence to the condensate preheater 4 and the steam generator 3 at the top of the condensate tower, and the second condensate branch pipeline 8 is connected in sequence to the condensate preheater 10 and the steam generator 9 at the top of the evaporator. The evaporator top pipeline 12 is connected in sequence to the evaporator top steam generator 9, the condensate preheater 10, and the reflux tank 11 at the top of the evaporator. The first condensate branch pipeline 7 and the second condensate branch pipeline 8 are connected by a cross-line pipeline 13.
[0019] Based on the above technical solutions, the condensate preheater is designed before the evaporator to raise the temperature; the condensate preheater can be disconnected and repaired separately at any time.
[0020] The inlet of the bypass pipeline 14 of the preheater of the extraction liquid tower is connected to the top pipeline 2 of the extraction liquid tower. The inlet of the bypass pipeline 14 of the preheater of the extraction liquid tower is located in front of the condensate preheater 4 at the top of the extraction liquid tower, and the outlet of the bypass pipeline 14 of the preheater of the extraction liquid tower is located in the rear of the condensate preheater 4 at the top of the extraction liquid tower.
[0021] The top pipeline 12 of the evaporator is connected to the inlet of the bypass pipeline 15 of the evaporator preheater. The inlet of the bypass pipeline 15 of the evaporator preheater is located before the condensate preheater 10 at the top of the evaporator, and the outlet of the bypass pipeline 15 of the evaporator preheater is located after the condensate preheater 10 at the top of the evaporator.
[0022] A first valve 101 and a first drain 201 are connected sequentially to the first condensate branch pipeline 7, with the first valve 101 and the first drain 201 located near the inlet of the first condensate branch pipeline 7; a second valve 102 and a second drain 202 are connected sequentially to the second condensate branch pipeline 8, with the second valve 102 and the second drain 202 located near the inlet of the second condensate branch pipeline 8; a third valve 103 and a third drain 203 are installed on the cross-line pipeline 13 near the second condensate branch pipeline 8, and a fourth valve 104 is installed on the cross-line pipeline 13 near the first condensate branch pipeline 7.
[0023] Based on the above technical solutions, gate valves and drain pipes are added near the condensate main pipe of each condensate preheater, and gate valves are added at the condensate outlet of the condensate preheater, which can isolate and drain the condensate side of the condensate preheater.
[0024] A fifth valve 105 is installed on the first condensate branch pipeline 7, and the fifth valve 105 is located between the condensate preheater 4 at the top of the outlet tower and the cross-line pipeline 13; a sixth valve 106 is installed on the top pipeline 2 of the extraction tower, and the sixth valve 106 is located between the inlet of the bypass pipeline 14 of the extraction tower preheater and the condensate preheater 4 at the top of the outlet tower; a seventh valve 107 is installed on the top pipeline 2 of the extraction tower, and the seventh valve 107 is located between the condensate preheater 4 at the top of the outlet tower and the outlet of the bypass pipeline 14 of the extraction tower preheater.
[0025] Based on the above technical solutions, gate valves are added to the inlet and outlet of the main oil line of the condensate preheater to isolate the oil side of the condensate preheater, and the stored oil can be discharged through the condensate preheater body.
[0026] A valve 108 is installed on the second condensate branch line 8, and the valve 108 is located between the condensate preheater 10 at the top of the evaporator and the cross-line line 13; a valve 109 is installed on the evaporator top line 12, and the valve 109 is located between the evaporator preheater bypass line 15 and the evaporator top condensate preheater 10; a valve 110 is installed on the evaporator top line 12, and the valve 110 is located between the evaporator top condensate preheater 10 and the evaporator preheater bypass line 15.
[0027] An air cooler 16 is installed on the top pipeline 2 of the extraction tower near the top outlet of the extraction tower 1.
[0028] The top outlet of the steam generator 3 at the top of the extraction tower is connected to the steam main of the steam turbine 17.
[0029] A first water supply valve 301 is installed on the first condensate branch line 7, and the first water supply valve 301 is located between the cross-line line 13 and the steam generator 3 at the top of the extraction liquid tower; a first preheater bypass valve 302 is installed on the preheater bypass line 14 of the extraction liquid tower; a second water supply valve 303 is installed on the second condensate branch line 8, and the second water supply valve 303 is located between the cross-line line 13 and the steam generator 9 at the top of the evaporation liquid tower; a second preheater bypass valve 304 is installed on the preheater bypass line 15 of the evaporation liquid tower; and a shut-off valve 35 to the evaporator is installed on the top line 2 of the extraction liquid tower.
[0030] The top pipeline 2 of the extraction tank is connected to the oil side of the condensate preheater 4 at the top of the extraction tank, and the first condensate branch pipeline 7 is connected to the water side of the condensate preheater 4 at the top of the extraction tank; the top pipeline 12 of the residual liquid tank is connected to the oil side of the condensate preheater 10 at the top of the residual liquid tank, and the second condensate branch pipeline 8 is connected to the water side of the condensate preheater 10 at the top of the residual liquid tank.
[0031] When the condensate preheater tube bundle leaks and needs maintenance, the waste heat power generation will continue to operate without shutdown.
[0032] 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 waste heat system at the top of a distillation column, characterized in that: The system includes an extractable liquid tower (1), an extractable liquid tower top pipeline (2), an extractable liquid tower top steam generator (3), an extractable liquid tower top condensate preheater (4), an extractable liquid tower top reflux tank (5), a condensate main pipeline (6), a first condensate branch pipeline (7), a second condensate branch pipeline (8), a residual liquid tower top steam generator (9), a residual liquid tower top condensate preheater (10), a residual liquid tower top reflux tank (11), a residual liquid tower top pipeline (12), and a cross-line pipeline (13). The top outlet of the extractable liquid tower (1) is connected to the inlet of the extractable liquid tower top pipeline (2). The extractable liquid tower top steam generator (3), the extractable liquid tower top condensate preheater (4), and the extractable liquid tower are sequentially connected to the extractable liquid tower top pipeline (2). Top reflux tank (5); the main condensate pipeline (6) is connected to the inlet of the first condensate branch pipeline (7) and the inlet of the second condensate branch pipeline (8); the first condensate branch pipeline (7) is connected in sequence to the condensate preheater (4) at the top of the extractor tower and the steam generator (3) at the top of the extractor tower, and the second condensate branch pipeline (8) is connected in sequence to the condensate preheater (10) at the top of the evaporator tower and the steam generator (9) at the top of the evaporator tower; the top pipeline (12) of the evaporator tower is connected in sequence to the steam generator (9) at the top of the evaporator tower, the condensate preheater (10) at the top of the evaporator tower and the reflux tank (11) at the top of the evaporator tower; the first condensate branch pipeline (7) and the second condensate branch pipeline (8) are connected by a cross-line pipeline (13).
2. The waste heat system at the top of the distillation column according to claim 1, characterized in that: The top pipeline (2) of the extraction liquid tower is connected to the inlet of the bypass pipeline (14) of the extraction liquid tower preheater. The inlet of the bypass pipeline (14) of the extraction liquid tower preheater is located in front of the condensate preheater (4) at the top of the extraction liquid tower, and the outlet of the bypass pipeline (14) of the extraction liquid tower preheater is located in the rear of the condensate preheater (4) at the top of the extraction liquid tower.
3. The waste heat system at the top of the distillation column according to claim 1, characterized in that: The top pipeline (12) of the evaporator is connected to the inlet of the bypass pipeline (15) of the evaporator preheater. The inlet of the bypass pipeline (15) of the evaporator preheater is located in front of the condensate preheater (10) at the top of the evaporator, and the outlet of the bypass pipeline (15) of the evaporator preheater is located in the rear of the condensate preheater (10) at the top of the evaporator.
4. The waste heat system at the top of the distillation column according to claim 1, characterized in that: A first valve (101) and a first drain (201) are connected in sequence to the first condensate branch pipeline (7), and the first valve (101) and the first drain (201) are close to the inlet of the first condensate branch pipeline (7); a second valve (102) and a second drain (202) are connected in sequence to the second condensate branch pipeline (8), and the second valve (102) and the second drain (202) are close to the inlet of the second condensate branch pipeline (8); a third valve (103) and a third drain (203) are installed on the cross-line pipeline (13) near the second condensate branch pipeline (8), and a fourth valve (104) is installed on the cross-line pipeline (13) near the first condensate branch pipeline (7).
5. The waste heat system at the top of the distillation column according to claim 2, characterized in that: A valve (105) is installed on the first condensate branch pipeline (7), and the valve (105) is located between the condensate preheater (4) at the top of the outlet tower and the cross-line pipeline (13); a valve (106) is installed on the top pipeline (2) of the extraction tower, and the valve (106) is located between the inlet of the bypass pipeline (14) of the extraction tower preheater and the condensate preheater (4) at the top of the outlet tower; a valve (107) is installed on the top pipeline (2) of the extraction tower, and the valve (107) is located between the condensate preheater (4) at the top of the outlet tower and the outlet of the bypass pipeline (14) of the extraction tower preheater.
6. The waste heat system at the top of the distillation column according to claim 3, characterized in that: A valve (108) is installed on the second condensate branch line (8), and the valve (108) is located between the condensate preheater (10) at the top of the evaporator and the cross-line line (13); a valve (109) is installed on the pipeline (12) at the top of the evaporator, and the valve (109) is located between the bypass pipeline (15) of the evaporator preheater and the condensate preheater (10) at the top of the evaporator; a valve (110) is installed on the pipeline (12) at the top of the evaporator, and the valve (110) is located between the condensate preheater (10) at the top of the evaporator and the bypass pipeline (15) of the evaporator preheater.
7. The waste heat system at the top of the distillation column according to claim 1, characterized in that: An air cooler (16) is installed on the top pipeline (2) of the extraction tower near the top outlet of the extraction tower (1).
8. The waste heat system at the top of the distillation column according to claim 1, characterized in that: The top outlet of the top steam generator (3) of the extraction liquid tower is connected to the steam main of the steam turbine (17).
9. The waste heat system at the top of the distillation column according to claim 1, characterized in that: It also includes a bypass pipeline (14) for the preheater of the effluent tower and a bypass pipeline (15) for the preheater of the residual liquid tower; the bypass pipeline (14) for the preheater of the effluent tower is connected to the top pipeline (2) of the effluent tower, the inlet of the bypass pipeline (14) for the effluent tower is located before the condensate preheater (4) at the top of the effluent tower, and the outlet of the bypass pipeline (14) for the effluent tower is located after the condensate preheater (4) at the top of the effluent tower; the bypass pipeline (15) for the preheater of the residual liquid tower is connected to the top pipeline (12) of the residual liquid tower, the inlet of the bypass pipeline (15) for the effluent tower is located before the condensate preheater (10) at the top of the residual liquid tower, and the outlet of the bypass pipeline (15) for the residual liquid tower is located after the condensate preheater (4) at the top of the effluent tower; The pipeline is connected to the condensate preheater (10) at the top of the tower. A first water supply valve (301) is installed on the first condensate branch pipeline (7), and the first water supply valve (301) is located between the cross-line pipeline (13) and the steam generator (3) at the top of the extractable liquid tower. A first preheater bypass valve (302) is installed on the bypass pipeline (14) of the extractable liquid tower preheater. A second water supply valve (303) is installed on the second condensate branch pipeline (8), and the second water supply valve (303) is located between the cross-line pipeline (13) and the steam generator (9) at the top of the evaporator tower. A second preheater bypass valve (304) is installed on the bypass pipeline (15) of the evaporator tower preheater. A shut-off valve (35) to the evaporator is installed on the top pipeline (2) of the extractable liquid tower.
10. The waste heat system at the top of the distillation column according to claim 1, characterized in that: The top pipeline (2) of the extraction tower is connected to the oil side of the condensate preheater (4) at the top of the extraction tower, and the first condensate branch pipeline (7) is connected to the water side of the condensate preheater (4) at the top of the extraction tower; the top pipeline (12) of the residual liquid tower is connected to the oil side of the condensate preheater (10) at the top of the residual liquid tower, and the second condensate branch pipeline (8) is connected to the water side of the condensate preheater (10) at the top of the residual liquid tower.