CN211069083U - Waste liquid recycling device in triethylene glycol dewatering system - Google Patents
Waste liquid recycling device in triethylene glycol dewatering system Download PDFInfo
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- CN211069083U CN211069083U CN201921912806.2U CN201921912806U CN211069083U CN 211069083 U CN211069083 U CN 211069083U CN 201921912806 U CN201921912806 U CN 201921912806U CN 211069083 U CN211069083 U CN 211069083U
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Abstract
The utility model relates to a triethylene glycol waste liquid treatment device's technical field is a waste liquid recycle device among triethylene glycol dewatering system, it includes the rectifying column, the reboiler, the waste liquid storage tank, the waste liquid pond, install the overhead condenser in the rectifying column, install the waste liquid circulation pipeline that is linked together with the waste liquid storage tank on the overhead condenser, install first circulating pump on the waste liquid circulation pipeline, the reboiler is installed to the bottom of rectifying column, first heat exchanger, the second heat exchanger is linked together with the reboiler, the second heat exchanger is linked together with the waste liquid storage tank, the waste liquid pond is linked together with the waste liquid storage tank. The utility model has the advantages of reasonable and compact structure, through setting up first circulating pump and second circulating pump, can squeeze into the rectifying column with the waste liquid in the waste liquid pond in, through rectifying column and reboiler, can get rid of most moisture in the waste liquid, and then make the triethylene glycol waste liquid that finally forms in the waste liquid storage tank reach the requirement that can recycle, also alleviateed sewage treatment plant's operation load.
Description
Technical Field
The utility model relates to a triethylene glycol waste liquid treatment device's technical field is a waste liquid recycle device among triethylene glycol dewatering system.
Background
The method is characterized in that a certain requirement is imposed on the dew point of gas in natural gas pipeline transportation, the natural gas needs to be dehydrated before entering a transportation pipeline so as to reduce the water dew point, so that the safety of pipeline transportation is ensured, a triethylene glycol dehydration process is frequently used when the natural gas is dried, a triethylene glycol dehydration system mainly comprises two parts, namely absorption dehydration and triethylene glycol regeneration, rectification and nitrogen gas stripping are used for improving the purity of circulating triethylene glycol in the triethylene glycol regeneration, a certain amount of waste liquid is generated after tail gas discharged by rectification is separated, the waste liquid contains a certain amount of triethylene glycol, and the content of the triethylene glycol in the waste liquid is low.
Disclosure of Invention
The utility model provides a waste liquid recycle device among triethylene glycol dewatering system has overcome above-mentioned prior art not enough, and it can effectively solve the direct row of triethylene glycol waste liquid that produces among the triethylene glycol dewatering system and arrange, makes it not obtain effective utilization, and then causes the problem that triethylene glycol is extravagant, aggravates current sewage treatment plant operation load.
The purpose of the application is realized as follows: the waste liquid recycling device in the triethylene glycol dehydration system comprises a rectifying tower, a reboiler, a waste liquid storage tank, a waste liquid pool, a first circulating pump and a second circulating pump, wherein a tower top condenser is arranged in the tower top of the rectifying tower, a rectifying tower vent is arranged above the tower top condenser, a heat exchange tube on the tower top condenser is a refrigerant channel for passing waste liquid, a waste liquid circulating pipeline communicated with the waste liquid storage tank is arranged at the inlet end of the heat exchange tube, a liquid level meter and a sampling valve are arranged on the waste liquid storage tank, the first circulating pump is arranged on the waste liquid circulating pipeline, an output branch pipe and a first valve are arranged on the waste liquid circulating pipeline at the outlet end of the first circulating pump, the first valve is arranged on the waste liquid circulating pipeline, the output branch pipe is connected to the waste liquid circulating pipeline between the first valve and the first circulating pump, the second valve is arranged on the output branch pipe, and, a second circulating pump is arranged on the liquid inlet pipeline, a drainage pipeline is arranged on the waste liquid pool, a material conveying pipeline communicated with the material inlet end of the rectifying tower is arranged at the outlet end of the heat exchange tube, a first heat exchanger is arranged on the material conveying pipeline, a refrigerant channel on the first heat exchanger is communicated with the material conveying pipeline, a steam pipeline, an overflow pipeline and a liquid injection pipeline are arranged on the reboiler, a heating steam pipeline for heating liquid in the reboiler is also arranged on the reboiler, a self-operated temperature control valve is arranged on the heating steam pipeline, a temperature sensor on the self-operated temperature control valve is arranged on the reboiler for measuring the temperature in the reboiler, the liquid injection pipeline is communicated with tower bottom kettle liquid of the rectifying tower, the steam pipeline is communicated with the interior of the rectifying tower for providing rising steam in the rectifying tower, the overflow pipeline is communicated with the inlet end of a heat medium channel of the first heat exchanger, and a second heat exchanger is arranged, the inlet end of the second heat exchanger heat medium channel is connected with the outlet end of the first heat exchanger heat medium channel through a pipe, the outlet end of the second heat exchanger heat medium channel is communicated with the waste liquid storage tank, and the refrigerant channel of the second heat exchanger is connected with a cooling water pipeline.
The following are further optimization or/and improvement of the technical scheme of the utility model: furthermore, a mechanical filter and an active carbon filter are sequentially arranged on a waste liquid circulating pipeline between the first valve and the inlet end of the heat exchange tube from bottom to top.
Further, a gas-liquid separator is communicated with a vent of the rectifying tower through a pipe, a gas-phase outlet end on the gas-liquid separator is communicated with the atmosphere, and a liquid-phase outlet end of the gas-liquid separator is provided with a reflux pipeline communicated with the waste liquid storage tank.
The utility model discloses simple structure can carry out the effective processing to the triethylene glycol waste liquid that produces in the triethylene glycol dewatering system, continuous rectification through the rectifying column, can effectively get rid of the water in the triethylene glycol waste liquid, make the triethylene glycol waste liquid that concentration was low originally, can not recycle, but become the high recoverable liquid of triethylene glycol content, the triethylene glycol waste liquid after the processing can directly be beaten back to and continue utilizing in the former triethylene glycol dewatering system through first circulating pump, thereby the waste of triethylene glycol has been reduced, the device has been had, the waste liquid that produces in the triethylene glycol dewatering system also needn't flow into sewage treatment plant, the operation load of current sewage treatment plant has been reduced; through installing the formula of relying on oneself temperature-sensing valve on the reboiler, can automatic control enter into the air input of reboiler internal heating steam to this waste liquid temperature in can the effective control reboiler, thereby can avoid the triethylene glycol in the waste liquid to decompose because of high temperature, and the temperature of waste liquid then can further be controlled in the setting of first heat exchanger, second heat exchanger, also can reduce the heat load of first circulating pump simultaneously, ensure its stable work, the utility model discloses simple structure has very strong practicality.
Drawings
The specific structure of the application is given by the following figures and examples:
FIG. 1 is a schematic view of a connection structure of a waste liquid recycling apparatus in a triethylene glycol dehydration system.
Legend: 1. the device comprises a rectifying tower, 2, a reboiler, 3, a waste liquid storage tank, 4, a waste liquid pool, 5, a first circulating pump, 6, a second circulating pump, 7, a heat exchange pipe, 8, an output branch pipe, 9, a first valve, 10, a second valve, 11, a liquid inlet pipeline, 12, a drainage pipeline, 13, a material conveying pipeline, 14, a steam pipeline, 15, an overflow pipeline, 16, a liquid injection pipeline, 17, a heating steam pipeline, 18, a first heat exchanger, 19, a second heat exchanger, 20, a cooling water pipeline, 21, a liquid level meter, 22, a temperature sensor, 23, a self-operated temperature control valve, 24, a mechanical filter, 25, an activated carbon filter, 26, a gas-liquid separator, 27, a reflux pipeline, 28, a waste liquid circulating pipeline, 29 and a sampling valve.
Detailed Description
The present application is not limited to the following examples, and specific implementations may be determined according to the technical solutions and practical situations of the present application.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 in the specification.
The invention will be further described with reference to the following examples and drawings, in which: as shown in the attached figure 1, the waste liquid recycling device in the triethylene glycol dehydration system comprises a rectifying tower 1, a reboiler 2, a waste liquid storage tank 3, a waste liquid pool 4, a first circulating pump 5 and a second circulating pump 6, a tower top condenser is arranged in the tower top of the rectifying tower 1, a vent of the rectifying tower 1 is arranged above the tower top condenser, a heat exchange tube 7 on the tower top condenser is a refrigerant channel for passing waste liquid, a waste liquid circulating pipeline 28 communicated with the waste liquid storage tank 3 is arranged at the inlet end of the heat exchange tube 7, a liquid level meter 21 and a sampling valve 29 are arranged on the waste liquid storage tank 3, the first circulating pump 5 is arranged on the waste liquid circulating pipeline 28, an output branch pipe 8 and a first valve 9 are arranged on the waste liquid circulating pipeline 28 at the outlet end of the first circulating pump 5, the first valve 9 is arranged on the waste liquid circulating pipeline 28, the output branch pipe 8 is connected on the waste liquid circulating pipeline, a second valve 10 is arranged on the output branch pipe 8, a liquid inlet pipeline 11 communicated with a waste liquid pool 4 is also arranged on the waste liquid storage tank 3, a second circulating pump 6 is arranged on the liquid inlet pipeline 11, a drainage pipeline 12 is arranged on the waste liquid pool 4, a material conveying pipeline 13 communicated with the material inlet end of the rectifying tower 1 is arranged at the outlet end of the heat exchange pipe 7, a first heat exchanger 18 is arranged on the material conveying pipeline 13, a refrigerant channel on the first heat exchanger 18 is communicated with the material conveying pipeline 13, a steam pipeline 14, an overflow pipeline 15 and a liquid injection pipeline 16 are arranged on the reboiler 2, a heating steam pipeline 17 for heating the liquid in the reboiler 2 is also arranged on the reboiler 2, a self-operated temperature control valve 23 is arranged on the heating steam pipeline 17, a temperature sensor 22 on the self-operated temperature control valve 23 is arranged on the reboiler 2 for measuring the temperature in the reboiler 2, and the liquid injection pipeline 16 is communicated with the tower bottom, the steam pipeline 14 is communicated with the inside of the rectifying tower 1 to provide rising steam inside the rectifying tower 1, the overflow pipeline 15 is communicated with the inlet end of a heat medium channel of the first heat exchanger 18, the outlet end of the heat medium channel of the first heat exchanger 18 is provided with a second heat exchanger 19, the inlet end of the heat medium channel of the second heat exchanger 19 is connected with the outlet end of the heat medium channel of the first heat exchanger 18 through a pipe, the outlet end of the heat medium channel of the second heat exchanger 19 is communicated with the waste liquid storage tank 3, and the refrigerant channel of the second heat exchanger 19 is connected with a cooling water pipeline 20.
The waste liquid produced by the triethylene glycol dehydration system is collected in a waste liquid pool 4 through a drainage pipeline 12 for waiting treatment, before the operation of the utility model, a first valve 9 is firstly opened, the first circulating pump 5 and a second circulating pump 6 are used for filling the rectifying tower 1, the reboiler 2 and the waste liquid storage tank 3 with enough waste liquid to prepare the preparation work before the operation, then the second circulating pump 6 is closed, when the utility model starts to operate, the waste liquid is transported by the first circulating pump 5, passes through a tower top condenser and a first heat exchanger 18 in turn from the waste liquid storage tank 3, finally enters the rectifying tower 1, and forms kettle liquid at the bottom of the rectifying tower 1, the kettle liquid is a kettle type reboiler 2, the kettle liquid enters the reboiler 2 through a liquid injection pipeline 16 and is heated to boiling by hot steam sent by a heating steam pipeline 17, and steam generated by the boiling enters the rectifying tower 1 through a steam pipeline 14, the ascending steam is subjected to heat exchange with the waste liquid in the heat exchange tube 7, the overhead condenser is a tube-type steam-liquid heat exchanger, the waste liquid passing through the overhead condenser is subjected to primary heating to reduce the heat load of the first heat exchanger 18, part of the ascending steam is liquefied due to the heat exchange and flows back to the rectifying tower 1, the rest steam is discharged to the outside from an emptying port at the top of the rectifying tower 1, so that the water content in the waste liquid is reduced, the concentration of triethylene glycol in the waste liquid is improved, the waste liquid subjected to primary heating is taken as a refrigerant of the first heat exchanger 18 to be subjected to heat exchange with the high-temperature waste liquid entering the first heat exchanger 18 through the overflow pipeline 15, so that the flowing high-temperature triethylene glycol waste liquid is cooled, the thermal decomposition of the triethylene glycol is avoided, the temperature of the triethylene glycol waste liquid can be further reduced by cooling water in the cooling water pipeline 20, so that the heat load of the, ensure that the first circulating pump 5 can work stably and continuously, when the temperature in the reboiler 2 exceeds the set safety value, the temperature sensor 22 on the self-operated temperature control valve 23 can sense in time, and reduce the opening of the self-operated temperature control valve 23, control the heating steam amount entering the reboiler 2, so as to maintain the working temperature of the reboiler about 2200 ℃, make the utility model able to operate safely and stably, further effectively avoid the problem of thermal decomposition of triethylene glycol due to high temperature, continuously pump the waste liquid in the waste liquid storage tank 3 into the rectifying tower 1 through the first circulating pump 5, continuously consume the water in the waste liquid under the continuous rectification action of the rectifying tower 1, after the liquid level in the waste liquid storage tank 3 is observed to be stable through the liquid level meter 21, close the first valve 9, open the second valve 10, pump the triethylene glycol waste liquid meeting the recovery requirement in the waste liquid storage tank 3 into the original triethylene glycol dehydration system through the output branch pipe 8 for utilization, through sampling valve 29, can conveniently obtain the waste liquid sample, through the testing and analysis, can accurately know the triethylene glycol concentration in the waste liquid. And after all the waste liquid in the waste liquid pool 4 is conveyed, supplementing new waste liquid into the waste liquid storage tank 3 from the waste liquid pool 4 through the second circulating pump 6, and performing new purification preparation.
The utility model discloses simple structure, can carry out the effective processing to the triethylene glycol waste liquid that produces among the triethylene glycol dewatering system, continuous rectification through rectifying column 1, can effectively get rid of the water in the triethylene glycol waste liquid, make concentration low originally, can not recycle's triethylene glycol waste liquid, but become the high recoverable liquid of triethylene glycol content, the triethylene glycol waste liquid after the processing can directly be got back to and continue to utilize among the former triethylene glycol dewatering system through first circulating pump 5, with this waste that has reduced the triethylene glycol, this set of device has been had, the waste liquid that produces among the triethylene glycol dewatering system also needn't flow into sewage treatment plant, the operational load of current sewage treatment plant has been reduced, has very strong practicality.
According to actual needs, the waste liquid recycling device in the triethylene glycol dehydration system is further optimized or/and improved: further, as shown in fig. 1, a mechanical filter 24 and an activated carbon filter 25 are sequentially installed on a waste liquid circulation line 28 between the first valve 9 and the inlet end of the heat exchange tube 7 from bottom to top. The mechanical filter 24 and the activated carbon filter 25 are well known in the art, and can remove impurities in the triethylene glycol waste liquid, so as to further ensure that the finally obtained rectification liquid in the waste liquid storage tank 3 meets the requirements of triethylene glycol recycling.
Further, as shown in fig. 1, a gas-liquid separator 26 is further connected to the vent of the rectifying tower 1, a gas-phase outlet end of the gas-liquid separator 26 is connected to the atmosphere, and a liquid-phase outlet end of the gas-liquid separator 26 is provided with a reflux pipeline 27 connected to the waste liquid storage tank 3.
The material that comes out from the drain mainly is the vapor that contains a small amount of triethylene glycol, in order to avoid the pollution of environment and the triethylene glycol of furthest recycle in the waste liquid, the utility model discloses set up vapour and liquid separator 26 again, vapour and liquid separator 26 is current well-known technique, and vapour and liquid separator 26 can collect the triethylene glycol liquid that comes out from rectifying column 1 drain again, then collects waste liquid storage tank 3 in through backflow pipeline 27, has improved the utility model discloses to the utilization ratio of triethylene glycol waste liquid.
The foregoing description is by way of example only and is not intended as limiting the embodiments of the present application. All obvious variations and modifications of the present invention are within the scope of the present invention.
Claims (3)
1. A waste liquid recycling device in a triethylene glycol dehydration system is characterized by comprising a rectifying tower, a reboiler, a waste liquid storage tank, a waste liquid pool, a first circulating pump and a second circulating pump, wherein a tower top condenser is arranged in the tower top of the rectifying tower, a vent hole of the rectifying tower is arranged above the tower top condenser, a heat exchange tube on the tower top condenser is a refrigerant channel for passing waste liquid, a waste liquid circulating pipeline communicated with the waste liquid storage tank is arranged at the inlet end of the heat exchange tube, a liquid level meter and a sampling valve are arranged on the waste liquid storage tank, the first circulating pump is arranged on the waste liquid circulating pipeline, an output branch pipe and a first valve are arranged on the waste liquid circulating pipeline at the outlet end of the first circulating pump, the first valve is arranged on the waste liquid circulating pipeline, the output branch pipe is connected to the waste liquid circulating pipeline between the first valve and the first circulating pump, the second valve is arranged on the output branch pipe, and, a second circulating pump is arranged on the liquid inlet pipeline, a drainage pipeline is arranged on the waste liquid pool, a material conveying pipeline communicated with the material inlet end of the rectifying tower is arranged at the outlet end of the heat exchange tube, a first heat exchanger is arranged on the material conveying pipeline, a refrigerant channel on the first heat exchanger is communicated with the material conveying pipeline, a steam pipeline, an overflow pipeline and a liquid injection pipeline are arranged on the reboiler, a heating steam pipeline for heating liquid in the reboiler is also arranged on the reboiler, a self-operated temperature control valve is arranged on the heating steam pipeline, a temperature sensor on the self-operated temperature control valve is arranged on the reboiler for measuring the temperature in the reboiler, the liquid injection pipeline is communicated with tower bottom kettle liquid of the rectifying tower, the steam pipeline is communicated with the interior of the rectifying tower for providing rising steam in the rectifying tower, the overflow pipeline is communicated with the inlet end of a heat medium channel of the first heat exchanger, and a second heat exchanger is arranged, the inlet end of the second heat exchanger heat medium channel is connected with the outlet end of the first heat exchanger heat medium channel through a pipe, the outlet end of the second heat exchanger heat medium channel is communicated with the waste liquid storage tank, and the refrigerant channel of the second heat exchanger is connected with a cooling water pipeline.
2. The apparatus for recycling waste liquid in a triethylene glycol dehydration system according to claim 1, wherein a mechanical filter and an activated carbon filter are sequentially installed on a waste liquid circulation line between the first valve and the inlet end of the heat exchange tube from bottom to top.
3. The apparatus for recycling waste liquid in a triethylene glycol dehydration system according to claim 1 or 2, wherein a gas-liquid separator is further connected to the vent of the rectification column through a pipe, a gas-phase outlet end of the gas-liquid separator is connected to the atmosphere, and a liquid-phase outlet end of the gas-liquid separator is provided with a return line connected to the waste liquid storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921912806.2U CN211069083U (en) | 2019-11-07 | 2019-11-07 | Waste liquid recycling device in triethylene glycol dewatering system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921912806.2U CN211069083U (en) | 2019-11-07 | 2019-11-07 | Waste liquid recycling device in triethylene glycol dewatering system |
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| CN211069083U true CN211069083U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921912806.2U Active CN211069083U (en) | 2019-11-07 | 2019-11-07 | Waste liquid recycling device in triethylene glycol dewatering system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113683248A (en) * | 2021-09-02 | 2021-11-23 | 山东义达环境工程有限公司 | Gas desulfurization liquid double-tower oxidation purification process |
| CN113737293A (en) * | 2021-06-30 | 2021-12-03 | 桐昆集团股份有限公司 | Filter element triethylene glycol washs and recycle device |
-
2019
- 2019-11-07 CN CN201921912806.2U patent/CN211069083U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737293A (en) * | 2021-06-30 | 2021-12-03 | 桐昆集团股份有限公司 | Filter element triethylene glycol washs and recycle device |
| CN113737293B (en) * | 2021-06-30 | 2022-08-30 | 桐昆集团股份有限公司 | Filter element triethylene glycol washs and recycle device |
| CN113683248A (en) * | 2021-09-02 | 2021-11-23 | 山东义达环境工程有限公司 | Gas desulfurization liquid double-tower oxidation purification process |
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