Steam condensate recycling system in hexamethylenediamine production process

Abstract

The utility model relates to a steam condensate recycling system in a hexamethylenediamine production process. Comprising a steam condensate tank, a steam condensate flash tank, a first condensate pump, a second condensate pump, a condensate flash condenser, a steam hot condensate tank, a steam condensate tank, a first water cooler, a second water cooler, a pipeline system and a control valve adjusting system, the control valve adjusting system and the pipeline system are used for collecting, storing, conveying and partially exchanging heat of steam condensate generated in the hexamethylenediamine production process, so that high-temperature purified water and low-temperature purified water are obtained respectively and are recycled by the system. The device is ingenious in design, high-temperature purified water and low-temperature purified water are obtained through collection, storage, conveying and partial heat exchange of steam condensate respectively and used by the device, cyclic utilization of water resources and heat is achieved, the problem that a large amount of steam condensate cannot be recycled in existing hexamethylenediamine production is solved, and the production efficiency is improved. And the method has good economic benefits and development space.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical steam condensate recovery and reuse, in particular to a steam condensate recovery and reuse system in the production process of hexamethylenediamine. Background Art

[0002] Hexamethylenediamine is an important organic compound, mainly used in organic synthesis, epoxy curing agents, chemical reagents, etc., and is one of the main raw materials for the production of nylon 66, with a melting point of 42 - 45°C. The crude hexamethylenediamine obtained from the reaction process needs to be subjected to several times of vacuum rectification to obtain high-purity hexamethylenediamine products. During the rectification process, a large amount of medium-pressure steam (SM) and low-pressure steam (SL) are required to provide heat sources for the rectification tower, which will generate a large amount of steam condensate and surplus heat. If not recycled, it will cause a large amount of waste of heat sources and water resources. In addition, the hexamethylenediamine production device requires a large amount of high-temperature pure water to wash and regenerate the catalyst discharged from the reactor, and also requires low-temperature pure water as the washing water for the sludge centrifuge.

[0003] How to design a system with a clever design that can convert steam condensate into high-temperature and low-temperature pure water that can be used by the device itself, realize the recycling of steam condensate and surplus heat, and ensure the continuous and stable production of the device is a technical problem that needs to be solved at present. Summary of the Utility Model

[0004] In order to solve the problem that a large amount of condensate cannot be recycled in the existing hexamethylenediamine production, the utility model provides a steam condensate recovery and reuse system in the production process of hexamethylenediamine. Through the collection, storage, transportation and partial heat exchange of steam condensate, high-temperature and low-temperature pure water are respectively obtained for the device's own use, realizing the recycling of water resources and heat.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a steam condensate recovery and reuse system in the production process of hexamethylenediamine, including a steam condensate tank, a steam condensate flash tank, a first condensate pump, a second condensate pump, a condensate flash condenser, a steam hot condensate tank, a steam condensate tank, a first water cooler, a second water cooler, a pipeline system and a control valve regulating system. The control valve regulating system and the pipeline system collect, store, transport and partially heat exchange the steam condensate generated in the hexamethylenediamine production process to respectively obtain high-temperature pure water and low-temperature pure water for the system's own recycling;

[0006] The pipeline system described above includes a steam condensate recovery pipeline, a high-temperature steam condensate recovery pipeline, a high-temperature steam condensate outlet pipeline, an ultra-low-pressure steam output pipeline, a low-pressure steam pipeline, an ultra-low-pressure steam equalizing pipeline, a condensate pump inlet pipeline, a steam condensate network transmission pipeline, a steam condensate transmission pipeline, and a steam hot condensate transmission pipeline;

[0007] The control valve regulating system described above includes ultra-low-pressure steam pressure regulating valves A and B, steam condensate flash tank level regulating valves C and D, steam condensate tank level regulating valve E, steam condensate tank level regulating valve F, and steam hot condensate tank level regulating valve G;

[0008] The steam condensate tank level regulating valve E is arranged on the outlet pipeline of the steam condensate tank to control the level of the steam condensate tank;

[0009] The steam condensate flash tank level regulating valves C and D are respectively arranged at the front and rear ends of the steam condensate flash tank to control the level of the steam condensate flash tank;

[0010] A steam condensate flash condenser is arranged at the upper end of the steam condensate flash tank, so that the ultra-low-pressure steam flashed by the steam condensate flash condenser is condensed into liquid and then returns to the steam condensate flash tank again.

[0011] As a further optimized solution for the steam condensate recovery and reuse system in the above-mentioned adipic diamine production process, the steam hot condensate tank level regulating valve G is arranged on the inlet pipeline of the steam hot condensate tank to control the level of the steam hot condensate tank; a medium-pressure steam pipeline is also arranged at the bottom of the steam hot condensate tank.

[0012] As a further optimized solution for the steam condensate recovery and reuse system in the above-mentioned adipic diamine production process, the steam condensate tank level regulating valve F is arranged on the inlet pipeline of the steam condensate tank to control the level of the steam condensate tank.

[0013] As a further optimized solution for the steam condensate recovery and reuse system in the above-mentioned adipic diamine production process, a first water cooler and a second water cooler are arranged in series on the inlet pipeline of the steam condensate tank, and the first water cooler and the second water cooler cooperate together to reduce the temperature of the steam condensate before entering the steam condensate tank to the target value.

[0014] As a further optimized solution for the steam condensate recovery and reuse system in the above-mentioned adipic diamine production process, ultra-low-pressure steam pressure regulating valves A and B are respectively arranged on the low-pressure steam pipeline and the ultra-low-pressure steam equalizing pipeline, and the ultra-low-pressure steam pressure regulating valves A and B respectively regulate the steam pressure in the low-pressure steam pipeline and the ultra-low-pressure steam equalizing pipeline.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The present utility model includes a steam condensate tank, a steam condensate flash tank, a first condensate pump, a second condensate pump, a condensate flash condenser, a steam hot condensate tank, a steam condensate tank, a first water cooler, a second water cooler, a pipeline system and a control valve regulating system. The control valve regulating system and the pipeline system collect, store, transport and partially heat exchange the steam condensate generated during the production process of hexamethylenediamine, respectively obtaining high-temperature pure water and low-temperature pure water for the self-circulation utilization of the system. The present utility model realizes the recycling of water resources and heat, and has very important significance in energy conservation and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the technological process of the present utility model;

[0018] Markings in the figure: 1. Steam condensate tank, 2. Steam condensate flash tank, 3. First condensate pump, 4. Second condensate pump, 5. Condensate flash condenser, 6. Steam hot condensate tank, 7. Steam condensate tank, 8. First water cooler, 9. Second water cooler, 10. Steam condensate recovery pipeline, 11. High-temperature steam condensate recovery pipeline, 12. High-temperature steam condensate outlet pipeline, 13. Ultra-low pressure steam output pipeline, 14. Low-pressure steam pipeline, 15. Ultra-low pressure steam equalizing pipeline, 16. Condensate pump inlet pipeline, 17. Steam condensate network transmission pipeline, 18. Steam condensate transmission pipeline, 19. Steam hot condensate transmission pipeline, A. Ultra-low pressure steam pressure regulating valve A, B. Ultra-low pressure steam pressure regulating valve B, C. Steam condensate flash tank liquid level regulating valve C, D. Steam condensate flash tank liquid level regulating valve D, E. Steam condensate tank liquid level regulating valve E, F. Steam condensate tank liquid level regulating valve F, G. Steam hot condensate tank liquid level regulating valve G. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further elaborates in detail on the specific embodiments of the present utility model in conjunction with the drawings.

[0020] A steam condensate recovery and reuse system during the production process of hexamethylenediamine includes a steam condensate tank 1, a steam condensate flash tank 2, a first condensate pump 3, a second condensate pump 4, a condensate flash condenser 5, a steam hot condensate tank 6, a steam condensate tank 7, a first water cooler 8, a second water cooler 9, a pipeline system and a control valve regulating system. The control valve regulating system and the pipeline system collect, store, transport and partially heat exchange the steam condensate generated during the production process of hexamethylenediamine, respectively obtaining high-temperature pure water and low-temperature pure water for the self-circulation utilization of the system.

[0021] The pipeline system described above includes a steam condensate recovery pipeline 10, a high-temperature steam condensate recovery pipeline 11, a high-temperature steam condensate outlet pipeline 12, an ultra-low pressure steam output pipeline 13, a low-pressure steam pipeline 14, an ultra-low pressure steam equalizing pipeline 15, a condensate pump inlet pipeline 16, a steam condensate network transmission pipeline 17, a steam condensate transmission pipeline 18, and a steam hot condensate transmission pipeline 19.

[0022] The control valve regulating system described above includes ultra-low pressure steam pressure regulating valves A and B, steam condensate flash tank level regulating valves C and D, steam condensate tank level regulating valve E, steam condensate tank level regulating valve F, and steam hot condensate tank level regulating valve G.

[0023] The steam condensate tank level regulating valve E is arranged on the outlet pipeline of the steam condensate tank 1 to control the level of the steam condensate tank 1.

[0024] The steam condensate flash tank level regulating valves C and D are respectively arranged at the front and rear ends of the steam condensate flash tank 2 to control the level of the steam condensate flash tank 2.

[0025] A steam condensate flash condenser 5 is arranged at the upper end of the steam condensate flash tank 2 so that the ultra-low pressure steam flashed by the steam condensate flash condenser 5 is condensed into a liquid and then returns to the steam condensate flash tank 2 again.

[0026] The steam hot condensate tank level regulating valve G is arranged on the inlet pipeline of the steam hot condensate tank 6 to control the level of the steam hot condensate tank 6; a medium-pressure steam pipeline is also arranged at the bottom of the steam hot condensate tank 6.

[0027] The steam condensate tank level regulating valve F is arranged on the inlet pipeline of the steam condensate tank 7 to control the level of the steam condensate tank 7.

[0028] A first water cooler 8 and a second water cooler 9 are arranged in series on the inlet pipeline of the steam condensate tank 7, and the first water cooler 8 and the second water cooler 9 cooperate together to reduce the temperature of the steam condensate before entering the steam condensate tank 7 to the target value.

[0029] Ultra-low pressure steam pressure regulating valves A and B are respectively arranged on the low-pressure steam pipeline 14 and the ultra-low pressure steam equalizing pipeline 15, and the ultra-low pressure steam pressure regulating valves A and B respectively regulate the steam pressure in the low-pressure steam pipeline 14 and the ultra-low pressure steam equalizing pipeline 15.

[0030] The working process of the condensate recovery and reuse of the present utility model is as follows:

[0031] Step 1: Collection of high-temperature steam condensate (CCH). As shown in the attached drawings, in the system for recycling and reusing steam condensate during the production of hexamethylenediamine, during the production of hexamethylenediamine, the steam condensate generated by the distillation column using medium-pressure steam (SM) as the heat source is collected and enters the steam condensate tank (1). A liquid level regulating valve E is provided on its outlet pipeline, and the control state is set to "AUTO" with a set value of "50%", automatically adjusting the liquid level of the steam condensate tank (1).

[0032] Step 2: Collection of steam condensate. As shown in the attached drawings, in the system for recycling and reusing steam condensate during the production of hexamethylenediamine, during the production of hexamethylenediamine, the steam condensate generated by the distillation column using low-pressure steam (SL) as the heat source is collected and enters the steam condensate flash tank (2). A condensate flash condenser (5) is provided at the top of the steam condensate flash tank, and the condensed steam returns to the condensate flash tank again. Steam condensate flash tank level regulating valves C and D are provided in the steam condensate flash tank, and the control state is set to "AUTO" with a set value of "50%", automatically adjusting the liquid level of the steam condensate flash tank (2) by adjusting the opening degrees of the steam condensate flash tank level regulating valves C and D.

[0033] Step 3: Generation of re-generated ultra-low-pressure steam (SLL). As shown in the attached drawings, in the system for recycling and reusing steam condensate during the production of hexamethylenediamine, the by-product ultra-low-pressure steam (SLL) generated by the steam condensate tank (1) enters the ultra-low-pressure steam network through the ultra-low-pressure steam output pipeline and is used as steam tracing for the material pipeline for use by each ultra-low-pressure steam user. The ultra-low-pressure steam pressure is regulated by ultra-low-pressure steam pressure regulating valves A and B, and the control state is set to "AUTO" with a set value of "0.12 MPa", automatically adjusting the ultra-low-pressure steam pressure by adjusting the opening degrees of the ultra-low-pressure steam pressure regulating valves A and B to meet the heat tracing requirements of the device.

[0034] Step 4: Generation of steam hot condensate (HPW). As shown in the attached drawings, in the system for recycling and reusing steam condensate during the production of hexamethylenediamine, the steam condensate generated by the device is transported to the steam hot condensate tank (6) by the first condensate pump (3) or the second condensate pump (4) (one is in normal use and the other is in standby). A steam condensate tank level regulating valve G is provided on its inlet pipeline, and the control state is set to "AUTO" with a set value of "80%", automatically adjusting the liquid level of the steam hot condensate tank (6). When the temperature of the condensate is relatively low, the valve on the medium-pressure steam (SM) pipeline at the bottom of the tank is opened to introduce medium-pressure steam (SM) into the tank to heat it to the target value to meet the requirements of each user in the device.

[0035] Step 5: Generation of steam condensate (PW). As shown in the attached drawings, in a steam condensate recovery and reuse system during the production process of hexamethylenediamine, the steam condensate generated by the device is transported into the steam condensate tank (7) by the first condensate pump (3) or the second condensate pump (4). A steam condensate tank liquid level regulating valve F is provided on its inlet pipeline, with the control state set to "AUTO" and the set value being "80%", automatically adjusting the liquid level of the steam condensate tank (7). A first water cooler (8) and a second water cooler (9) are also provided on the inlet pipeline of the steam thermal condensate tank (7) to reduce the temperature of the condensate to about 25°C to meet the requirements of each user within the device.

[0036] The utility model is ingeniously designed. By collecting, storing, transporting, and partially heat-exchanging the steam condensate, high-temperature and low-temperature pure water are respectively obtained for the device's own use, realizing the recycling of water resources and heat, solving the problem that a large amount of steam condensate cannot be recycled in the existing hexamethylenediamine production. For the current situation, it not only has great significance in energy conservation and consumption reduction, but also has good economic benefits and development space.

[0037] The above has described in detail the preferred specific embodiments and examples of the utility model in conjunction with the attached drawings. However, the utility model is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the concept of the utility model.

Claims

1. A system for recycling steam condensate in the production process of hexamethylenediamine, characterized in that: The system comprises a steam condensate tank (1), a steam condensate flash tank (2), a first condensate pump (3), a second condensate pump (4), a condensate flash condenser (5), a steam hot condensate tank (6), a steam condensate tank (7), a first water cooler (8), a second water cooler (9), a pipeline system and a control valve regulating system. The control valve regulating system and the pipeline system collect, store, transport and partially exchange heat for the steam condensate generated in the production process of hexamethylenediamine, respectively obtaining high-temperature pure water and low-temperature pure water for the system to circulate and utilize. The pipeline system comprises a steam condensate recovery pipeline (10), a high-temperature steam condensate recovery pipeline (11), a high-temperature steam condensate outlet pipeline (12), an ultra-low-pressure steam output pipeline (13), a low-pressure steam pipeline (14), an ultra-low-pressure steam equalizing pipeline (15), a condensate pump inlet pipeline (16), a steam condensate network transmission pipeline (17), a steam condensate transmission pipeline (18) and a steam hot condensate transmission pipeline (19); The control valve regulating system includes ultra-low pressure steam pressure regulating valves A and B, steam condensate flash tank level regulating valves C and D, steam condensate tank level regulating valve E, steam condensate tank level regulating valve F and steam hot condensate tank level regulating valve G; The steam condensate tank liquid level regulating valve E is arranged on the outlet pipeline of the steam condensate tank (1) to control the liquid level of the steam condensate tank (1); The steam condensate flash tank liquid level regulating valves C and D are respectively arranged at the front and rear ends of the steam condensate flash tank (2) to control the liquid level of the steam condensate flash tank (2); A steam condensate flash condenser (5) is provided at the upper end of the steam condensate flash tank (2) so that the ultra-low pressure steam obtained by flash evaporation in the steam condensate flash condenser (5) is condensed into liquid and then returned to the steam condensate flash tank (2).

2. The system for recycling steam condensate in the production process of hexamethylenediamine as claimed in claim 1, characterized in that: The steam hot condensate tank liquid level regulating valve G is arranged on the steam hot condensate tank (6) inlet pipeline, so as to control the liquid level of the steam hot condensate tank (6); a medium-pressure steam pipeline is also arranged at the bottom of the steam hot condensate tank (6).

3. The system for recycling steam condensate in the production process of hexamethylenediamine as claimed in claim 1, characterized in that: A steam condensate tank liquid level regulating valve F is arranged on the inlet pipeline of the steam condensate tank (7) to control the liquid level of the steam condensate tank (7).

4. The system for recycling steam condensate in the production process of hexamethylenediamine as claimed in claim 1, characterized in that: A first water cooler (8) and a second water cooler (9) are arranged in series on the inlet pipeline of the steam condensate tank (7), and the first water cooler (8) and the second water cooler (9) cooperate to reduce the temperature of the steam condensate before entering the steam condensate tank (7) to a target value.

5. The system for recycling steam condensate in the production process of hexamethylenediamine as claimed in claim 1, characterized in that: Ultra-low-pressure steam pressure regulating valves A and B are respectively provided on the low-pressure steam pipeline (14) and the ultra-low-pressure steam equalizing pressure pipeline (15). The ultra-low-pressure steam pressure regulating valves A and B respectively regulate the steam pressure in the low-pressure steam pipeline (14) and the ultra-low-pressure steam equalizing pressure pipeline (15).

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