DMO rectification feeding and discharging heat recycling device

Abstract

The utility model belongs to the technical field of chemical engineering, and particularly relates to a DMO rectification feeding and discharging heat recycling device. The system comprises a crude DMO entering device, a heat exchanger, a DMO light component removal tower feeding tank and the like. An outlet pipeline of the crude DMO inlet device is divided into two paths, one path is connected with a first inlet of the heat exchanger through a first regulating valve, and the other path is converged with a connecting pipeline of a first outlet of the heat exchanger through a second regulating valve and then is communicated with a DMO light component removal tower feeding tank. An outlet pipeline of the refined DMO inlet device is connected with a second inlet of the heat exchanger; and a second outlet pipeline of the heat exchanger is divided into three paths. By controlling the opening degree of the regulating valve, the coarse DMO and the fine DMO are subjected to heat exchange by utilizing temperature difference, and the feeding temperature of the coarse DMO is increased while the extraction temperature of the fine DMO is reduced. The system can avoid the electric energy consumption of the cooling fan, reduces the steam consumption, has the heat recovery rate of more than 90%, reduces the occupied area, prolongs the service life, and has good popularization and application values.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of chemical production, and particularly relates to a DMO rectification feed-in and feed-out heat recycling device. BACKGROUND

[0002] In the field of chemical production, the DMO (dimethyl oxalate) rectification process involves a large amount of heat exchange and utilization. The traditional DMO rectification system has many deficiencies in the management of feed-in and feed-out heat, and these problems become more and more prominent with the continuous rise of energy costs and the increasingly stringent environmental protection requirements.

[0003] In the traditional DMO rectification process, the heat between the feed-in and feed-out is not effectively recycled. The high-temperature DMO feed-out directly enters the subsequent processing link, and a large amount of heat carried by it is wasted to the environment, not only causing great waste of energy, but also possibly causing thermal pollution to the surrounding environment and affecting the ecological balance. In order to maintain the operating temperature of the rectification tower, a large amount of steam needs to be consumed to heat the feed-in, which makes the steam consumption high, increasing the production cost of the enterprise. At the same time, in order to dissipate the heat of the high-temperature feed-out, cooling fans and other equipment are often required, which consume a large amount of electric energy during operation, further increasing energy consumption and enterprise operating costs.

[0004] Due to the lack of effective heat recovery system in the traditional process, each device operates independently, and more space is needed to layout the feed-in preheating equipment, cooling equipment and rectification tower, etc., resulting in a large occupied area of the entire production device, increasing the cost of land resource occupation. Moreover, due to the frequent cold and hot alternation and the long-term operation of the equipment in the high temperature difference environment, the equipment is easily affected by thermal stress and other factors, resulting in an increased equipment failure rate and a shortened service life. Frequent equipment maintenance and replacement not only affect the production efficiency, but also increase the equipment maintenance cost of the enterprise.

[0005] Under the background of advocating energy saving and emission reduction and green production, the chemical industry urgently needs a DMO rectification feed-in and feed-out heat recycling system that is efficient, energy-saving, environmentally friendly and can improve the overall performance of the equipment, to solve the above problems existing in the traditional process and realize sustainable development. SUMMARY

[0006] The application provides a DMO rectification feed-in and feed-out heat recycling device to solve the technical problems of ineffective recycling of heat in the DMO rectification process in the prior art, causing energy waste, and the need for separate heat recovery system in the traditional process, resulting in high energy consumption of the system, short service life of the equipment and large occupied area of the overall device.

[0007] In order to achieve the above purpose, the application adopts the following technical scheme:

[0008] The application discloses a DMO rectification inlet and outlet heat recycling device.

[0009] The heat exchanger is provided with a first inlet, and the outlet pipeline of the crude DMO feeding device is connected with the first inlet of the heat exchanger.

[0010] The heat exchanger is further provided with a first outlet, and the communication pipeline of the first outlet is connected with a DMO light component removal column feeding tank.

[0011] The outlet pipeline of the crude DMO feeding device and the communication pipeline of the first outlet are combined and connected with the inlet pipeline of the DMO light component removal column feeding tank.

[0012] The inlet pipeline of the DMO light component removal column feeding tank is provided with a second temperature monitoring device.

[0013] The pipeline, in which the crude DMO feeding device is connected with the DMO light component removal column feeding tank, is provided with a second regulating valve.

[0014] The heat exchanger is provided with a second inlet, and the outlet pipeline of the refined DMO feeding device is connected with the second inlet of the heat exchanger.

[0015] The heat exchanger is provided with a second outlet, and the outlet pipeline of the second outlet is provided with a first temperature monitoring device.

[0016] The outlet pipeline of the second outlet is divided into three paths, one of which is connected with a de-azeotrope device, one of which is connected with a crude DMO tank, and the last one of which is connected with a refined DMO tank.

[0017] Among the three pipelines, the inlet pipelines of the crude DMO tank and the refined DMO tank are provided with valves, and the two valves are not opened at the same time.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The DMO rectification inlet and outlet heat recycling device provided by the application can preliminarily construct the basic framework of heat recycling, provide a basis for subsequent effective heat exchange adjustment, help to realize heat recycling and reduce energy waste.

[0020] Further, the first inlet of the heat exchanger is connected with the outlet pipeline of the crude DMO feeding device and is provided with a first adjusting valve, which further refines the inlet structure of heat recovery, so that the crude DMO feeding can enter the heat exchanger for heat exchange more accurately, improves the efficiency of heat recovery, and avoids energy waste.

[0021] Further, the first outlet is provided and its connecting pipeline is connected with the DMO light-removing column feed tank, so that the crude DMO after heat exchange can reasonably enter the subsequent process link, optimizing the process flow, and also providing a reasonable path for heat transfer and utilization in the whole system, reducing energy loss caused by unreasonable discharge setting.

[0022] Further, the outlet pipeline of the crude DMO feeding device and the connecting pipeline of the first outlet are merged and connected with the feed pipeline of the DMO light-removing column feed tank, which can better integrate the heat transfer process and ensure that the crude DMO enters the DMO light-removing column feed tank at a suitable temperature, improving the heat utilization efficiency of the whole system and reducing the energy loss in the transfer process.

[0023] Further, the second temperature monitoring device is provided on the feed pipeline of the DMO light-removing column feed tank, which can monitor the temperature of the crude DMO entering the DMO light-removing column feed tank in real time, so that the system parameters can be adjusted in time according to the temperature condition to ensure that the crude DMO enters at a suitable temperature, further improving the heat utilization efficiency and avoiding energy waste caused by unsuitable temperature.

[0024] Further, the second adjusting valve is provided on the pipeline connecting the crude DMO feeding device with the DMO light-removing column feed tank, which can flexibly adjust the flow and entering mode of the crude DMO in cooperation with the first adjusting valve, so as to better control the heat exchange process and improve the effect of heat recovery and utilization, while also helping to reduce system energy consumption.

[0025] Further, the second inlet of the heat exchanger is connected with the outlet pipeline of the refined DMO feeding device, so that the refined DMO can enter the heat exchanger for heat exchange, perfecting the structure of the heat recovery and utilization system and providing necessary conditions for heat exchange between the crude DMO and the refined DMO, which helps to improve the heat recovery efficiency of the whole system.

[0026] Further, the first temperature monitoring device is provided on the outlet pipeline of the second outlet of the heat exchanger, which can monitor the refined DMO outlet temperature in real time, and the system operating parameters can be adjusted according to the temperature condition to ensure that the refined DMO outlet temperature meets the requirements, improving the accuracy of heat recovery and utilization and avoiding energy waste caused by unreasonable refined DMO temperature.

[0027] Further, the second discharge outlet discharge pipeline is divided into three paths and is connected to different components respectively, which can reasonably allocate the discharge direction of fine DMO according to actual production requirements, improve the flexibility and adaptability of the system, and also help to optimize the entire production process and reduce energy waste in the discharge process.

[0028] Further, the valves are arranged on the inlet pipelines of the coarse DMO tank and the fine DMO tank and are not opened at the same time, which can select a suitable discharge path according to the actual production situation, avoid energy waste and production accidents caused by incorrect discharge selection, improve the safety and reliability of the system, and further optimize the operation of the heat recovery system. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 : DMO rectification discharge heat recovery device schematic diagram.

[0030] Label explanation: 1, coarse DMO feeding device; 2, heat exchanger; 3, DMO light removal column feeding tank; 4, first regulating valve; 5, second regulating valve; 6, first temperature monitoring device; 7, second temperature monitoring device; 8, fine DMO feeding device; 9, first feeding port; 10, first discharge port; 11, second feeding port; 12, second discharge port. DETAILED DESCRIPTION

[0031] In order to further understand the content of the present application, the present application will be described in detail in combination with the drawings and specific examples. It should be understood that the examples are only used to explain the present application and are not limited.

[0032] The embodiments of the present application will be described in detail below in combination with the drawings.

[0033] Reference Figure 1 For example Figure 1As shown in the figure, the heat exchanger 2 comprises a first inlet 9, a first outlet 10, a second inlet 11 and a second outlet 12; the outlet pipeline of the crude DMO feeding device 1 is divided into two paths to be connected with the DMO light-removing tower feeding tank 3; one path is connected with the DMO light-removing tower feeding tank 3 through the heat exchanger 2, the outlet pipeline of the crude DMO feeding device 1 is connected with the first inlet 9 of the heat exchanger 2, the first outlet 10 of the heat exchanger 2 is connected with the DMO light-removing tower feeding tank 3, and the first inlet 9 and the first outlet 10 of the heat exchanger 2 are in internal communication; in this path, the connecting pipeline of the crude DMO feeding device 1 and the heat exchanger 2 is provided with the first regulating valve 4; the other path is connected with the inlet pipeline of the DMO light-removing tower feeding tank 3 after being combined with the connecting pipeline of the first outlet 10 of the heat exchanger 2; the pipeline directly connecting the crude DMO feeding device 1 and the DMO light-removing tower feeding tank 3 is provided with the second regulating valve 5; the inlet pipeline of the DMO light-removing tower feeding tank 3 is provided with the second temperature monitoring device 7; the outlet pipeline of the fine DMO feeding device 8 is connected with the second inlet 11 of the heat exchanger 2, and the second inlet 11 and the second outlet 12 of the heat exchanger 2 are in internal communication; the connecting pipeline of the second outlet 12 of the heat exchanger 2 is divided into three paths at the outlet thereof, one path is connected with the anti-azeotropic device, one path is connected with the crude DMO tank, and the last path is connected with the fine DMO tank; the connecting pipeline of the first outlet 10 of the heat exchanger 2 is provided with the first temperature monitoring device 6.

[0034] The embodiment provides a DMO rectification feeding and discharging heat recovery device, and the specific implementation steps are as follows:

[0035] The crude DMO at 75-80℃ is input into the heat exchanger 2 through the crude DMO feeding device 1, and the fine DMO at 120-140℃ is input into the heat exchanger 2 through the fine DMO feeding device 8, the crude DMO at 75-80℃ and the fine DMO at 120-140℃ are heat-exchanged in the heat exchanger 2, so that the feeding temperature of the crude DMO is increased and the discharging temperature of the fine DMO is reduced, the crude DMO at 75-80℃ and the fine DMO at 120-140℃ reach the required temperature at the same time, and the required temperature is 92-105℃; in the embodiment, the heat exchanger 2 adopts a 110744-101 DMO heat exchanger.

[0036] In the DMO rectification feeding and discharging heat recovery system, the outlet pipeline of the crude DMO feeding device 1 is divided into two paths, one path directly enters the DMO light-removing tower feeding tank 3 through the second regulating valve 5, and the other path is connected with the heat exchanger 2 through the first regulating valve 4; the outlet pipeline of the fine DMO feeding device 8 is connected with the connecting pipeline of the second inlet 11 of the heat exchanger 2, and the fine DMO enters the heat exchanger 2 through the second inlet 11.

[0037] In the heat exchanger 2, the crude DMO and the refined DMO are heat exchanged with each other. Through the monitoring data of the first temperature monitoring device 6 and the second temperature monitoring device 7, the opening degree of the first adjusting valve 4 is controlled to control the flow of the crude DMO into the heat exchanger 2. When the system is started initially, since the temperature of the crude DMO is low, the crude DMO with low temperature and the refined DMO with low temperature have little temperature difference, and the heat exchange is not obvious. When the first temperature monitoring device 6 monitors that the temperature of the crude DMO entering the DMO light-removing tower feed tank 3 is lower than 92 DEG C, the opening degree of the first adjusting valve 4 is gradually increased by the staff, and the second adjusting valve 5 is correspondingly adjusted to be small. If the first temperature monitoring device 6 monitors that the temperature of the crude DMO entering the DMO light-removing tower feed tank 3 is higher than 105 DEG C, the opening degree of the first adjusting valve 4 is gradually reduced by the staff, and the second adjusting valve 5 is correspondingly adjusted to be large.

[0038] With the proceeding of the heat exchange process, the temperature of the crude DMO is gradually increased, and the temperature of the refined DMO is gradually decreased. When the temperature of the crude DMO is increased to 92 DEG C-105 DEG C, the required temperature of the DMO light-removing tower feed tank 3 is met, and the crude DMO meeting the required temperature enters the DMO light-removing tower feed tank 3 through the first feeding port 9 of the heat exchanger 2. After the heat exchange is completed, the temperature of the refined DMO is decreased to the required temperature range 92 DEG C-105 DEG C, and reaches the required temperature. At this time, the second discharging port 12 of the heat exchanger 2 inputs the refined DMO meeting the required temperature into the azeotrope-breaking and refined DMO tank under the normal working condition. If the required temperature is not reached, the refined DMO after the heat exchange enters the azeotrope-breaking and crude DMO tank, and the pipeline switching can be performed on site by the operator.

[0039] As another preferred scheme in the application, the second temperature monitoring device 7, the first adjusting valve 4 and the second adjusting valve 5 are connected with the computer, the second temperature monitoring device 7 sends the real-time monitoring temperature data to the computer, the computer compares the temperature data with the required temperature, if the temperature of the crude DMO entering the DMO light-removing tower feed tank 3 is lower than 92 DEG C, the computer controls the opening degree of the first adjusting valve 4 to be increased, and controls the second adjusting valve 5 to be correspondingly adjusted to be small. If the temperature of the crude DMO entering the DMO light-removing tower feed tank 3 is higher than 105 DEG C, the computer controls the opening degree of the first adjusting valve 4 to be reduced, and the second adjusting valve 5 is correspondingly adjusted to be large. When the monitoring result of the second temperature monitoring device 7 meets the required temperature range, the first adjusting valve 4 and the second adjusting valve 5 keep the current opening degree, and the crude DMO after the heat exchange enters the DMO light-removing tower feed tank 3.

[0040] The outlet pipeline of the second outlet 12 on the heat exchanger 2 is divided into three ways, one way is connected to the azeotrope breaking, one way is connected to the crude DMO tank, and the last way is connected to the fine DMO tank, among the three pipeline, the inlet pipeline of the crude DMO tank and the fine DMO tank is provided with a valve, the first temperature monitoring device 6 monitors the outlet temperature of the second outlet 12 pipeline of the heat exchanger 2 in real time, if the outlet temperature meets the required temperature range, the staff samples and tests the outlet, analyzes whether the DMO purity in the outlet reaches 99.5%, if the DMO purity reaches 99.5%, the on-site operator closes the valve on the inlet pipeline of the crude DMO tank, the fine DMO after heat exchange enters the azeotrope breaking and the fine DMO tank, if the DMO purity does not reach 99.5%, the on-site operator closes the valve on the inlet pipeline of the fine DMO tank, the fine DMO after heat exchange enters the azeotrope breaking and the crude DMO tank, if the outlet temperature monitored by the first temperature monitoring device 6 does not reach the required temperature, the on-site operator closes the valve on the inlet pipeline of the fine DMO tank, the outlet after heat exchange which does not reach the required temperature enters the crude DMO tank and the azeotrope breaking.

[0041] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application, any modification made on the basis of the technical solutions according to the technical idea of the present application falls within the protection scope of the claims of the present application.

Claims

1. A DMO rectification feed and draw heat recovery device, characterized by, The heat exchanger (2) is connected with the crude DMO feeding device (1) and the refined DMO feeding device (8), and a first adjusting valve (4) is arranged on the connecting pipeline of the crude DMO feeding device (1) and the heat exchanger (2).

2. The DMO rectifying feed and discharge heat recycling device according to claim 1, characterized in that, The heat exchanger (2) is provided with a first feeding port (9), the outlet pipeline of the crude DMO feeding device (1) is connected with the first feeding port (9) of the heat exchanger (2), and a first adjusting valve (4) is arranged on the communication pipeline of the crude DMO feeding device (1) and the heat exchanger (2).

3. The DMO rectifying feed and discharge heat recycling device according to claim 2, characterized in that, The heat exchanger (2) is further provided with a first discharging port (10), and the communication pipeline of the first discharging port (10) is connected with a DMO light component removal column feeding tank (3).

4. The DMO rectifying feed and discharge heat recycling device according to claim 3, characterized in that, The outlet pipeline of the crude DMO feeding device (1) is combined with the communication pipeline of the first discharging port (10) of the heat exchanger (2) and is directly connected with the inlet pipeline of the DMO light component removal column feeding tank (3).

5. The DMO rectifying feed and discharge heat recycling device according to claim 4, characterized in that, The inlet pipeline of the DMO light component removal column feeding tank (3) is provided with a second temperature monitoring device (7).

6. The DMO rectifying feed and discharge heat recycling device according to claim 4, characterized in that, The pipeline, in which the crude DMO feeding device (1) is directly connected with the DMO light component removal column feeding tank (3), is provided with a second adjusting valve (5).

7. The DMO rectifying feed and discharge heat recycling device according to claim 2, characterized in that, The heat exchanger (2) is provided with a second feeding port (11), and the outlet pipeline of the refined DMO feeding device (8) is connected with the second feeding port (11) of the heat exchanger (2).

8. The DMO rectifying feed and discharge heat recycling device according to claim 7, characterized in that, The heat exchanger (2) is provided with a second discharging port (12), and the outlet pipeline of the second discharging port (12) is provided with a first temperature monitoring device (6).

9. The DMO rectifying feed and discharge heat recycling device according to claim 8, characterized in that, The outlet pipeline of the second discharging port (12) is divided into three paths, one path is connected with a deboiling device, one path is connected with a crude DMO tank, and the last path is connected with a refined DMO tank.

10. The DMO rectifying feed and discharge heat recycling device according to claim 9, characterized in that, In the three pipeline paths, the inlet pipelines of the crude DMO tank and the refined DMO tank are provided with valves, and the two valves are not opened at the same time.

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