Waste heat utilization device for blow-off pipeline of ethylene glycol evaporator

Abstract

The utility model discloses an ethylene glycol evaporator blow-off pipeline waste heat utilization device which comprises an ethylene glycol evaporator provided with a blow-off opening and an ethylene glycol supplementing opening. The heat exchanger is provided with a heat release side inlet, a heat release side outlet, a heat absorption side inlet and a heat absorption side outlet; an ethylene glycol collecting tank; one end of the first pipeline is connected with the drain outlet, and the other end of the first pipeline is connected with the heat release side inlet; one end of the second pipeline is connected with the heat absorption side outlet, and the other end of the second pipeline is connected with the ethylene glycol supplementing opening; one end of the third pipeline is connected with the heat release side outlet, and the other end of the third pipeline is connected with the ethylene glycol collecting tank; and one end of the fourth pipeline is connected with the heat absorption side inlet, and cold ethylene glycol enters the heat exchanger through the fourth pipeline. Heat of the drainage pipeline of the ethylene glycol evaporator is utilized.

Description

Technical Field

[0001] The utility model generally relates to the field of polyester production, and in particular to a waste heat utilization device for a sewage discharge pipeline of an ethylene glycol evaporator. Background Art

[0002] At present, in polyester production, the second pre-polycondensation reaction and the final polycondensation reaction need to rely on high vacuum reaction conditions. The vacuum suction capacity of the liquid ring vacuum pump can no longer meet the reaction requirements. Therefore, the current mainstream polyester devices all use three-stage vacuum injection devices as the second pre-polycondensation reaction and the final polycondensation reaction. The power steam of the three-stage vacuum injection device uses ethylene glycol, one of the reaction raw materials. It takes a lot of heat to heat the liquid ethylene glycol at ambient temperature to a temperature that meets the vacuum pump injection power requirements. At the same time, the low-discharge sewage pipeline of the ethylene glycol evaporator directly discharges high-temperature ethylene glycol to the ethylene glycol liquid seal tank, which also causes a lot of heat waste. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a device for utilizing waste heat of a sewage pipeline of an ethylene glycol evaporator, which utilizes the heat of the sewage pipeline of the ethylene glycol evaporator.

[0004] In the first aspect, the utility model of the ethylene glycol evaporator sewage pipeline waste heat utilization device comprises:

[0005] An ethylene glycol evaporator is provided with a sewage outlet and an ethylene glycol replenishment port;

[0006] A heat exchanger having a heat release side inlet, a heat release side outlet, a heat absorption side inlet and a heat absorption side outlet;

[0007] Ethylene glycol collection tank;

[0008] A first pipeline, one end of which is connected to the sewage outlet, and the other end of which is connected to the heat release side inlet;

[0009] A second pipeline, one end of which is connected to the heat absorption side outlet, and the other end of which is connected to the ethylene glycol replenishment port;

[0010] A third pipeline, one end of which is connected to the heat release side outlet, and the other end of which is connected to the ethylene glycol collection tank;

[0011] A fourth pipeline has one end connected to the heat absorption side inlet, and cold ethylene glycol enters the heat exchanger through the fourth pipeline.

[0012] According to the technical solution provided in the embodiment of the present application, the high-temperature ethylene glycol discharged from the ethylene glycol evaporator enters the heat release side of the heat exchanger through the first pipeline, and the cold ethylene glycol enters the heat absorption side of the heat exchanger from the heat absorption side inlet. The high-temperature ethylene glycol and the cold ethylene glycol exchange heat in the heat exchanger. The high-temperature ethylene glycol after heat release enters the ethylene glycol collection tank through the third pipeline, and the cold ethylene glycol after heat absorption enters the ethylene glycol evaporator through the third pipeline, so that the ethylene glycol evaporator is supplemented with ethylene glycol, thereby utilizing the heat of the ethylene glycol evaporator discharge pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0014] Figure 1 It is a structural schematic diagram of a waste heat utilization device for a sewage pipeline of an ethylene glycol evaporator according to an embodiment of the utility model. DETAILED DESCRIPTION

[0015] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0016] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0017] Please refer to Figure 1 The utility model discloses a waste heat utilization device for a sewage pipeline of an ethylene glycol evaporator, comprising: an ethylene glycol evaporator 100, which is provided with a sewage outlet 110 and an ethylene glycol replenishing port 120; a heat exchanger 200, which is provided with a heat release side inlet 211, a heat release side outlet 212, a heat absorption side inlet 221 and a heat absorption side outlet 222; an ethylene glycol collecting tank 300; a first pipeline 400, one end of which is connected to the sewage outlet 110, and the other end is connected to the heat release side inlet 211; a second pipeline 500, one end of which is connected to the heat absorption side outlet 222, and the other end is connected to the ethylene glycol replenishing port 120; a third pipeline 600, one end of which is connected to the heat release side outlet 212, and the other end is connected to the ethylene glycol collecting tank 300; a fourth pipeline 700, one end of which is connected to the heat absorption side inlet 221, and cold ethylene glycol enters the heat exchanger 200 through the fourth pipeline 700.

[0018] In an embodiment of the present utility model, one end of the first pipeline 400 is connected to the sewage outlet 110, and the other end of the first pipeline 400 is connected to the heat release side inlet 211, and the high-temperature ethylene glycol discharged from the ethylene glycol evaporator 100 enters the heat release side of the heat exchanger 200 through the first pipeline 400.

[0019] One end of the third pipeline 600 is connected to the heat release side outlet 212 , and the other end of the third pipeline 600 is connected to the ethylene glycol collection tank 300 . The high-temperature ethylene glycol after heat release enters the ethylene glycol collection tank 300 through the third pipeline 600 .

[0020] One end of the fourth pipeline 700 is connected to the heat absorption side inlet 221 , and the cold ethylene glycol enters the heat exchanger 200 through the fourth pipeline 700 .

[0021] One end of the second pipeline 500 is connected to the heat absorption side outlet 222, and the other end of the second pipeline 500 is connected to the ethylene glycol replenishing port 120. The cold ethylene glycol after absorbing heat enters the ethylene glycol evaporator 100 through the third pipeline 600, and the ethylene glycol evaporator 100 is replenished with ethylene glycol, thereby utilizing the heat of the sewage pipeline of the ethylene glycol evaporator 100.

[0022] In the prior art, before collecting the hot ethylene glycol discharged from the sewage pipeline of the ethylene glycol evaporator 100, the hot ethylene glycol needs to be cooled by the plate heat exchanger 200. The ethylene glycol evaporator sewage pipeline waste heat utilization device of the utility model can reduce the load of the plate heat exchanger 200.

[0023] In the prior art, before adding cold ethylene glycol to the ethylene glycol evaporator 100, a heat medium heating system is required to heat the cold ethylene glycol. The ethylene glycol evaporator sewage pipeline waste heat utilization device of the utility model can reduce the heat consumption of the heat medium heating system. At the same time, the stability of the ethylene glycol vapor pressure is improved, and the disturbance to the vacuum system is reduced.

[0024] Furthermore, a first ball valve 410 , a flow meter 420 and a second ball valve 430 are sequentially disposed on the first pipeline 400 . The first ball valve 410 is located on a side of the first pipeline 400 close to the sewage outlet 110 .

[0025] In the embodiment of the utility model, by setting the flow meter 420, the flow of the first pipeline 400 can be monitored. By setting the first ball valve 410 and the second ball valve 430, the on-off of the first pipeline 400 is controlled. The flow meter 420 is located between the first ball valve 410 and the second ball valve 430, which is convenient for maintenance of the flow meter 420.

[0026] Furthermore, a third ball valve 440 is provided on the first pipeline 400, and the third ball valve 440 is located between the first ball valve 410 and the sewage outlet 110, and also includes a bypass pipeline 800, one end of the bypass pipeline 800 is connected between the first ball valve 410 and the third ball valve 440, and the other end of the bypass pipeline 800 is connected between the second ball valve 430 and the heat release side inlet 211, and a fourth ball valve 810 is provided on the bypass pipeline 800.

[0027] In an embodiment of the utility model, by setting a bypass line 800, when a failure occurs in the flow meter 420, the first ball valve 410 or the second ball valve 430, the fourth ball valve 810 can be opened to allow the bypass line 800 to be conductive, thereby ensuring that the high-temperature ethylene glycol discharged from the ethylene glycol evaporator 100 can smoothly enter the heat release side of the heat exchanger 200, and the ethylene glycol evaporator sewage line waste heat utilization device does not need to be shut down.

[0028] The first pipeline 400 is provided with a third ball valve 440 , and the third ball valve 440 is located between the first ball valve 410 and the sewage outlet 110 . The third ball valve 440 can control the on-off of the entire first pipeline 400 , so as to facilitate the maintenance of the first pipeline 400 .

[0029] Furthermore, the second pipeline 500 is provided with a fifth ball valve 510 .

[0030] In the embodiment of the present utility model, the fifth ball valve 510 can control the on-off of the second pipeline 500 , so as to facilitate the maintenance of the second pipeline 500 .

[0031] Furthermore, the third pipeline 600 is provided with a sixth ball valve 610 .

[0032] In the embodiment of the present utility model, the sixth ball valve 610 can control the on-off of the third pipeline 600 , so as to facilitate the maintenance of the third pipeline 600 .

[0033] Furthermore, the fourth pipeline 700 is provided with a seventh ball valve 710 .

[0034] In the embodiment of the present utility model, the seventh ball valve 710 can control the on-off of the fourth pipeline 700 , so as to facilitate the maintenance of the fourth pipeline 700 .

[0035] Furthermore, an exhaust pipeline 230 is provided on the heat absorption side of the heat exchanger 200 .

[0036] In an embodiment of the utility model, an exhaust pipeline 230 is provided on the heat absorption side of the heat exchanger 200. When the heat exchanger 200 is heavily fouled, after the heat exchanger 200 is dismantled and cleaned, the exhaust pipeline 230 can be used to remove the accumulated gas to ensure the normal operation of the heat exchanger 200.

[0037] Further, the exhaust pipeline 230 is provided with an eighth ball valve 231 .

[0038] In the embodiment of the present utility model, the eighth ball valve 231 can control the on-off of the exhaust pipeline 230 , so as to facilitate the maintenance of the exhaust pipeline 230 .

[0039] Furthermore, a low discharge pipeline 240 is provided at the bottom of the heat absorption side of the heat exchanger 200 .

[0040] In the embodiment of the utility model, after the heat exchanger 200 is deactivated, the ethylene glycol in the heat exchanger 200 can be discharged through the low discharge pipeline 240. At the same time, the low discharge pipeline 240 can also be used as a sampling point of the ethylene glycol evaporator 100, eliminating the original sampling valve group.

[0041] Furthermore, the low discharge pipeline 240 is provided with a ninth ball valve 241 .

[0042] In the embodiment of the present utility model, the ninth ball valve 241 can control the on-off of the low-discharge pipeline 240 , so as to facilitate the maintenance of the low-discharge pipeline 240 .

[0043] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A waste heat utilization device for the sewage pipeline of an ethylene glycol evaporator, characterized in that: include: An ethylene glycol evaporator is provided with a sewage outlet and an ethylene glycol replenishment port; A heat exchanger having a heat release side inlet, a heat release side outlet, a heat absorption side inlet and a heat absorption side outlet; Ethylene glycol collection tank; A first pipeline, one end of which is connected to the sewage outlet, and the other end of which is connected to the heat release side inlet; A second pipeline, one end of which is connected to the heat absorption side outlet, and the other end of which is connected to the ethylene glycol replenishment port; A third pipeline, one end of which is connected to the heat release side outlet, and the other end of which is connected to the ethylene glycol collection tank; A fourth pipeline has one end connected to the heat absorption side inlet, and cold ethylene glycol enters the heat exchanger through the fourth pipeline.

2. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 1, characterized in that: The first pipeline is provided with a first ball valve, a flow meter and a second ball valve in sequence, and the first ball valve is located on a side of the first pipeline close to the sewage outlet.

3. The device for utilizing waste heat from the sewage pipeline of the ethylene glycol evaporator according to claim 2, characterized in that: The first pipeline is provided with a third ball valve, and the third ball valve is located between the first ball valve and the sewage outlet. It also includes a bypass pipeline, one end of which is connected between the first ball valve and the third ball valve, and the other end of which is connected between the second ball valve and the heat release side inlet, and a fourth ball valve is arranged on the bypass pipeline.

4. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 1, characterized in that: The second pipeline is provided with a fifth ball valve.

5. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 1, characterized in that: The third pipeline is provided with a sixth ball valve.

6. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 1, characterized in that: The fourth pipeline is provided with a seventh ball valve.

7. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 1, characterized in that: An exhaust pipeline is provided on the heat absorption side of the heat exchanger.

8. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 7, characterized in that: The exhaust line is provided with an eighth ball valve.

9. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 1, characterized in that: A low discharge pipeline is arranged at the bottom of the heat absorption side of the heat exchanger.

10. The device for utilizing waste heat from the sewage pipeline of an ethylene glycol evaporator according to claim 9, characterized in that: The low discharge pipeline is provided with a ninth ball valve.

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