CN211502719U

CN211502719U - Ethylene glycol replacement energy-saving device

Info

Publication number: CN211502719U
Application number: CN201922376876.7U
Authority: CN
Inventors: 丁寅; 韩张炎; 俞张炯; 袁剑青; 叶志静
Original assignee: Zhejiang Juxing Chemical Fiber Co ltd
Current assignee: Zhejiang Juxing Chemical Fiber Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-09-15
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses an ethylene glycol replacement energy-saving device, which comprises a heat exchanger and an ethylene glycol evaporator, wherein the ethylene glycol evaporator comprises an evaporation inner cavity and a heat exchange pipeline, a heating medium is connected to the inlet of the heat exchange pipeline, the ethylene glycol evaporator is provided with an ethylene glycol steam outlet and an ethylene glycol feed inlet, the ethylene glycol steam outlet is communicated with a vacuum system for polyester production, the heat exchanger comprises a left pipeline and a right pipeline which are in heat exchange contact, the inlet end of the right pipeline is communicated with a first pipeline, a second pipeline is communicated between the outlet on the right pipeline and the ethylene glycol feed inlet, the evaporation inner cavity is also communicated with a replacement pipeline, the replacement pipeline is connected with the inlet on the left pipeline, the outlet of the left pipeline is connected with a hot well, the outlet of the hot well is communicated with a third pipeline, the third pipeline is connected with a lower segment process spray system, the temperature change of the hot well is reduced, the liquid level fluctuation, the higher temperature ethylene glycol enters the ethylene glycol evaporator to be heated, so that the use amount of heat of a heating medium is reduced.

Description

Ethylene glycol replacement energy-saving device

Technical Field

The utility model relates to a device, more specifically say a little, relate to an ethylene glycol replacement economizer, belong to the chemical fiber manufacturing field.

Background

At the present stage, in the polyester production process, an EG evaporator is taken as an important component in a system and can provide power for a vacuum system, ethylene glycol in the EG evaporator is composed of two paths, one path is fresh EG (ethylene glycol), the other path is vacuum EG, EG is heated by a heat-conducting medium, so that 230 ℃ steam is generated by vaporization of EG to provide power for the vacuum system, but in the production process, the EG evaporator is in a high-temperature state for a long time and is easy to cause material carbonization, so that the EG evaporator needs to be replaced by fresh ethylene glycol regularly, in the daily production replacement process, ethylene glycol steam at about 230 ℃ flows into a hot well, the cold and hot change amplitude is increased, the hot well is rolled, the liquid level fluctuates, oligomers in the hot well are easy to enter the spraying system, nozzles of the spraying system are blocked, and the temperature of ethylene glycol in the hot well is increased, so that the spraying temperature of ethylene glycol is increased, the vacuum of an inner cavity of equipment, therefore, the long-time large-flow replacement cannot be carried out in the daily replacement process, and meanwhile, the carbon material is occasionally formed to block the discharge pipe in the replacement process, so that the unsuccessful replacement is easily caused.

SUMMERY OF THE UTILITY MODEL

In order to solve the prior art problem, the utility model provides an ethylene glycol replacement economizer with can reduce the hot well temperature variation, reduce the influence to the vacuum of spraying system, reduce the thermal use amount of heat medium, technical characterstic such as can be energy-conserving.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

an ethylene glycol replacement energy-saving device comprises a heat exchanger and an ethylene glycol evaporator, wherein the ethylene glycol evaporator comprises an evaporation inner cavity and a heat exchange pipeline in heat exchange contact with the evaporation inner cavity, a heat medium is connected to an inlet of the heat exchange pipeline, the ethylene glycol evaporator is provided with an ethylene glycol steam outlet and an ethylene glycol feed inlet which are communicated with the evaporation inner cavity, the ethylene glycol steam outlet is communicated with a vacuum system for producing polyester, the heat exchanger comprises a left pipeline and a right pipeline which are in heat exchange contact, the inlet end of the right pipeline is communicated with a first pipeline for conveying fresh glycol, a second pipeline is communicated between an outlet on the right pipeline and a glycol feed inlet, the evaporation inner cavity is also communicated with a replacement pipeline which is connected with an inlet on the left pipeline, the outlet of the left pipeline is connected with a hot well, the outlet of the hot well is communicated with a third pipeline, and the third pipeline is connected with a lower-section process spraying system.

As an improvement, a fourth pipeline is connected to the second pipeline to convey vacuum ethylene glycol.

As a modification, the temperature of the fresh ethylene glycol is 30 ℃ and the temperature of the vacuum ethylene glycol is 35 ℃.

As an improvement, the heat exchanger is a shell and tube heat exchanger.

As an improvement, a pump is connected to the third pipeline to convey glycol flowing out of the hot well.

As an improvement, the spraying system comprises a first flange pipeline, a second flange pipeline, a vacuum ball valve and a third flange pipeline which are sequentially connected end to end, a graphite sealing layer is arranged at the joint of the first flange pipeline and the second flange pipeline, the graphite sealing layer divides the first flange pipeline into a sealed space, the lower end of the third flange pipeline is communicated with an equipment inner cavity, the upper end of the first flange pipeline is sealed, the first metal pipeline can sequentially penetrate through the upper end of the first flange pipeline and the graphite sealing layer in a sliding manner from top to bottom and extends into the equipment inner cavity from the lower end of the third flange pipeline, the contact part of the upper end of the first flange pipeline and the graphite sealing layer with the first metal pipeline is sealed, the lower end of the first metal pipeline is communicated with a nozzle, the nozzle can be retracted into the second flange pipeline or extend into the equipment inner cavity by moving the first metal pipeline up and down, a metal pipeline upper end intercommunication No. three pipelines, No. one flange pipeline lateral wall intercommunication has the booster duct way, No. three pipelines of booster duct intercommunication, No. one metal pipeline diameter is four times of booster duct diameter.

Has the advantages that: firstly, the replaced ethylene glycol steam flows into a hot well after being cooled (the temperature can be reduced from 230 ℃ to about 100 ℃), so that the change of the temperature of the hot well is reduced, the fluctuation of the liquid level of the hot well is also reduced, the influence on the vacuum of a spraying system is also greatly reduced, the time of the replacement process can be prolonged, the replacement amount can be increased, and the replacement effect can be better achieved; and secondly, the fresh ethylene glycol added into the ethylene glycol evaporator is heated by the replaced ethylene glycol steam, and the temperature is increased (the temperature can be increased from 30 ℃ to about 90 ℃), so that the ethylene glycol with higher temperature enters the ethylene glycol evaporator to be heated and evaporated, the heat consumption of a heating medium is reduced, and the energy-saving effect is achieved.

Drawings

Fig. 1 is a schematic diagram of the structure of the power device of the vacuum system of the present invention.

Fig. 2 is the structural schematic diagram of the spraying system of the present invention.

Detailed Description

The present invention will be further described with reference to the drawings attached to the specification, but the present invention is not limited to the following embodiments.

As shown in fig. 1, the specific embodiment of an ethylene glycol replacement energy-saving device is shown, the ethylene glycol replacement energy-saving device of the embodiment includes a heat exchanger 1 and an ethylene glycol evaporator 2, the ethylene glycol evaporator 2 includes an evaporation inner cavity and a heat exchange pipeline in heat exchange contact with the evaporation inner cavity, a heat medium is connected to an inlet 3 of the heat exchange pipeline, the ethylene glycol evaporator 2 is provided with an ethylene glycol steam outlet 4 and an ethylene glycol feed inlet 5 which are communicated with the evaporation inner cavity, the ethylene glycol steam outlet 4 is communicated with a vacuum system for polyester production, the heat exchanger 1 includes a left pipeline 6 and a right pipeline 7 in heat exchange contact, an inlet end of the right pipeline 7 is communicated with a first pipeline 8 for conveying fresh ethylene glycol, a second pipeline 9 is communicated between an outlet on the right pipeline 7 and the ethylene glycol feed inlet 5, the evaporation inner cavity is further communicated with a replacement pipeline 10, the replacement pipeline 10 is connected to an inlet on the left pipeline 6, the outlet of the left pipeline 6 is connected with a hot well 11, the outlet of the hot well 11 is communicated with a third pipeline 12, the third pipeline 12 is connected with a lower-section process spraying system, and the opening and closing of each pipeline are controlled by combining the arrangement of valves in the application;

in the polyester production process, the ethylene glycol evaporator 2 provides power for a vacuum system, an ethylene glycol incoming path in the ethylene glycol evaporator 2 comprises a first pipeline 8 for conveying fresh ethylene glycol, the ethylene glycol is heated by a heating medium connected to a heat exchange pipeline to be vaporized to generate steam (230 ℃) for providing power for the vacuum system, the fresh ethylene glycol is conveyed by the first pipeline 8 for replacement at regular intervals, the replaced ethylene glycol steam flows into a hot well 11 after being cooled (the temperature can be reduced from 230 ℃ to about 100 ℃), the change of the temperature of the hot well 11 is reduced, the fluctuation of the liquid level of the hot well 11 is also reduced, the influence on vacuum is also greatly reduced, the time of the replacement process can be prolonged, the replacement amount can be increased, the replacement effect can be better achieved, the fresh ethylene glycol added into the ethylene glycol evaporator 2 is heated by the replaced ethylene glycol steam, the temperature is increased (the temperature can be increased from 30 ℃ to about 90 ℃), the temperature of the fresh glycol entering the glycol evaporator 2 is higher, the heat required for heating the fresh glycol is reduced, and the energy-saving effect is achieved.

As a modified embodiment mode, a fourth pipeline 13 is connected to the second pipeline 9 to convey vacuum ethylene glycol, and another ethylene glycol source of the ethylene glycol evaporator 2 is added.

As an improved embodiment mode, the temperature of the fresh ethylene glycol is 30 ℃, the material carbonization is avoided, the temperature of the vacuum ethylene glycol is 35 ℃, and the heat exchange with the ethylene glycol steam is efficient.

As an improved embodiment mode, the heat exchanger 1 is a tube type heat exchanger which mainly comprises a shell, a tube plate, a heat exchange tube, an end enclosure and a baffle plate, and the required materials can be respectively made of common carbon steel, red copper or stainless steel. During heat exchange, the tube pass is as follows: a fluid enters from a connecting pipe of the end socket, flows in the connecting pipe and flows out from an outlet pipe at the other end of the end socket; shell pass: the other fluid enters from a connecting pipe of the shell and flows out from the other connecting pipe on the shell, and the left pipeline 6 and the right pipeline 7 respectively correspond to the tube side and the shell side.

As a modified embodiment, a pump 14 is connected to the third pipeline 12 to convey the glycol flowing out of the hot well 11, and pressurized conveying is performed to facilitate efficient glycol conveying.

As an improved embodiment, as shown in fig. 2, the spraying system includes a first flange pipeline 101, a second flange pipeline 102, a vacuum ball valve, and a third flange pipeline 103, which are sequentially connected end to end, a graphite sealing layer 104 is disposed at a connection position of the first flange pipeline 101 and the second flange pipeline 102, the graphite sealing layer 104 divides the first flange pipeline 101 into a sealed space, a lower end of the third flange pipeline 103 is communicated with an equipment cavity 114, an upper end of the first flange pipeline 101 is hermetically disposed, the spraying system further includes a first metal pipeline 105, the first metal pipeline 105 sequentially slidably penetrates through the upper end of the first flange pipeline 101 and the graphite sealing layer 104 from top to bottom and extends into the equipment cavity 114 from the lower end of the third flange pipeline 103, a contact position of the upper end of the first flange pipeline 101 and the graphite sealing layer 104 with the first metal pipeline 105 is sealed, a lower end of the first metal pipeline 105 is communicated with a nozzle 106, the first metal pipeline 105 is moved up and down, the nozzle 106 can retract into the second flange pipeline 102 or extend into an equipment inner cavity 114, the upper end of the first metal pipeline 105 is communicated with the third pipeline 12, the outer side wall of the first flange pipeline 101 is communicated with a pressurizing pipeline 107, the pressurizing pipeline 107 is communicated with the third pipeline 12, the diameter of the first metal pipeline 105 is four times that of the pressurizing pipeline 107, the pressurizing pipeline 107 is opened in production operation to keep an ethylene glycol liquid seal in the first flange pipeline 101 to be always in a positive pressure state, even if the original graphite seal is worn, air cannot enter the equipment inner cavity, and therefore the stability of the vacuum degree of a system is guaranteed.

Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.

Claims

1. The utility model provides an ethylene glycol replacement economizer which characterized in that: the heat exchanger comprises a heat exchanger (1) and a glycol evaporator (2), wherein the glycol evaporator (2) comprises an evaporation inner cavity and a heat exchange pipeline in heat exchange contact with the evaporation inner cavity, a heat medium is connected to an inlet (3) of the heat exchange pipeline, a glycol steam outlet (4) and a glycol feed inlet (5) which are communicated with the evaporation inner cavity are arranged on the glycol evaporator (2), the glycol steam outlet (4) is communicated with a vacuum system for polyester production, the heat exchanger (1) comprises a left pipeline and a right pipeline (6 and 7) in heat exchange contact, an inlet end of the right pipeline (7) is communicated with a pipeline (8) to convey fresh glycol, a second pipeline (9) is communicated between an outlet on the right pipeline (7) and the glycol feed inlet (5), the evaporation inner cavity is also communicated with a replacement pipeline (10), and the replacement pipeline (10) is connected with an inlet on the left pipeline (6), the outlet of the left pipeline (6) is connected with a hot well (11), the outlet of the hot well (11) is communicated with a third pipeline (12), and the third pipeline (12) is connected with a lower-section process spraying system.

2. The ethylene glycol displacement energy-saving device according to claim 1, characterized in that: and a fourth pipeline (13) is connected to the second pipeline (9) to convey vacuum ethylene glycol.

3. The ethylene glycol displacement energy-saving device according to claim 2, characterized in that: the temperature of the fresh ethylene glycol is 30 ℃ and the temperature of the vacuum ethylene glycol is 35 ℃.

4. The ethylene glycol displacement energy-saving device according to claim 1, characterized in that: the heat exchanger (1) is a shell and tube heat exchanger.

5. The ethylene glycol displacement energy saving device of claim 1, 2, 3 or 4, wherein: and a pump (14) is connected to the third pipeline (12) to convey glycol flowing out of the hot well (11).

6. The ethylene glycol displacement energy-saving device according to claim 1, characterized in that: the spraying system comprises a first flange pipeline (101), a second flange pipeline (102), a vacuum ball valve and a third flange pipeline (103) which are sequentially connected end to end, a graphite sealing layer (104) is arranged at the joint of the first flange pipeline (101) and the second flange pipeline (102), the graphite sealing layer (104) divides the first flange pipeline (101) into a sealing space, the lower end of the third flange pipeline (103) is communicated with an equipment inner cavity (114), the upper end of the first flange pipeline (101) is sealed, the spraying system also comprises a first metal pipeline (105), the first metal pipeline (105) sequentially penetrates through the upper end of the first flange pipeline (101) and the graphite sealing layer (104) in a sliding manner from top to bottom and extends into the equipment inner cavity (114) from the lower end of the third flange pipeline (103), and the contact part of the first flange pipeline (101) and the graphite sealing layer (104) with the first metal pipeline (105) is sealed, the lower end of the first metal pipeline (105) is communicated with a nozzle (106), the first metal pipeline (105) moves up and down, the nozzle (106) can retract into a second flange pipeline (102) or extend into an equipment inner cavity (114), the upper end of the first metal pipeline (105) is communicated with a third pipeline (12), the outer side wall of the first flange pipeline (101) is communicated with a booster pipeline (107), the booster pipeline (107) is communicated with the third pipeline (12), and the diameter of the first metal pipeline (105) is four times that of the booster pipeline (107).