CN112843754A - System and method for continuously vacuumizing evaporation kettle - Google Patents
System and method for continuously vacuumizing evaporation kettle Download PDFInfo
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- CN112843754A CN112843754A CN202011566486.7A CN202011566486A CN112843754A CN 112843754 A CN112843754 A CN 112843754A CN 202011566486 A CN202011566486 A CN 202011566486A CN 112843754 A CN112843754 A CN 112843754A
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- 238000001704 evaporation Methods 0.000 title claims abstract description 56
- 230000008020 evaporation Effects 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 137
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 14
- 230000001502 supplementing effect Effects 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000004939 coking Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical group 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to a continuous vacuumizing system for an evaporation kettle, which comprises the evaporation kettle, a vacuum collection tank, a water seal tank, an underground tank, an ejector, a vacuum pump, a water tank, a first heat exchanger and a second heat exchanger, wherein the evaporation kettle is provided with a vacuum collection tank; a steam outlet at the top of the evaporation kettle is connected with a steam inlet of a first heat exchanger through a steam pipeline, a condensate outlet of the first heat exchanger is connected with an underground tank through a condensate pipeline, a gas-liquid outlet of the first heat exchanger is connected with a gas-liquid inlet of a vacuum collection tank through a gas-liquid pipeline, a liquid outlet of the vacuum collection tank is connected with the underground tank through a liquid pipeline, and a gas outlet of the vacuum collection tank is connected with a gas inlet of a jet device through a gas pipeline; the ejector is arranged on a first circulating water pipeline of the water tank, and a vacuum pump is arranged on the first circulating water pipeline; the water tank is also provided with a second circulating water pipeline, and the second circulating water pipeline is connected with the cooling water pipeline through a second heat exchanger. The invention realizes the purpose of continuously vacuumizing the evaporation kettle, and the evaporation kettle runs uninterruptedly, thereby improving the evaporation efficiency.
Description
Technical Field
The invention relates to the technical field of coking, in particular to a system and a method for continuously vacuumizing an evaporation kettle.
Background
The evaporation kettle is a main device for extracting the secondary salt in the desulfurization solution during the recovery of the coking product, the internal pressure of the evaporation kettle needs to be controlled to be about 60KPa during the work, and the evaporation effect can be ensured by controlling the temperature to be about 80 ℃ under the pressure.
Most of the existing vacuum pumping equipment adopts an oil-free vertical vacuum pump, and in the actual operation process, because the full condensation of evaporated steam cannot be realized, a large amount of steam enters a piston cylinder body of the vacuum pump, the vacuum pump is frequently damaged, the overhaul workload is increased, and the equipment maintenance cost is increased; in addition, the oil-free vertical vacuum pump has very high noise in the operation process, and causes serious noise pollution to the field environment.
When the evaporation kettle operates, a large amount of condensate can be accumulated in the vacuum collection groove at the upstream of the vacuum pump, the vacuum pump needs to be stopped periodically every day, and a liquid discharge valve of the vacuum collection groove is manually opened to evacuate the liquid in the vacuum collection groove; therefore, the continuous operation of the evaporation kettle can not be realized by vacuumizing, and the labor intensity of operators is relatively high. In addition, once the liquid drainage of the vacuum collection groove is untimely, the liquid can enter the pump head of the oil-free vertical vacuum pump, the vacuum pump is directly damaged, and potential safety hazards exist.
Disclosure of Invention
The invention provides a system and a method for continuously vacuumizing an evaporation kettle, which realize the purpose of continuously vacuumizing the evaporation kettle, and the evaporation kettle continuously operates, thereby improving the evaporation efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a continuous vacuumizing system for an evaporation kettle comprises the evaporation kettle, a vacuum collection tank, a water seal tank, an underground tank, an ejector, a vacuum pump, a water tank, a first heat exchanger and a second heat exchanger; a steam outlet at the top of the evaporation kettle is connected with a steam inlet of a first heat exchanger through a steam pipeline, a condensate outlet of the first heat exchanger is connected with an underground tank through a condensate pipeline, a gas-liquid outlet of the first heat exchanger is connected with a gas-liquid inlet of a vacuum collection tank through a gas-liquid pipeline, a liquid outlet of the vacuum collection tank is connected with the underground tank through a liquid pipeline, and a gas outlet of the vacuum collection tank is connected with a gas inlet of a jet device through a gas pipeline; the ejector is arranged on a first circulating water pipeline of the water tank, and a vacuum pump is arranged on the first circulating water pipeline; the water tank is also provided with a second circulating water pipeline, and the second circulating water pipeline is connected with the cooling water pipeline through a second heat exchanger.
And a check valve is arranged on a gas pipeline at the upstream of the ejector.
A first valve is arranged on the steam pipeline; a second valve is arranged on the condensate pipeline; a third valve is arranged on the gas-liquid pipeline; a fourth valve is arranged on the gas pipeline; and a fifth valve is arranged on the liquid pipeline.
And a sixth valve is arranged on the first circulating water pipeline at the upstream of the vacuum pump, and a seventh valve is arranged on the first circulating water pipeline at the downstream of the vacuum pump.
And a circulating cooling pump is arranged on the circulating water pipeline II, a valve eight is arranged on the circulating water pipeline II at the upstream of the circulating cooling pump, and a valve nine is arranged on the circulating water pipeline at the downstream of the circulating cooling pump.
The two circulating water pipelines are connected with the underground tank through a drainage pipeline, and a valve ten is arranged on the drainage pipeline; and a cooling water inlet pipeline of the second heat exchanger is additionally connected with a water tank through a water supplementing pipeline, and the water supplementing pipeline is provided with an eleventh valve.
And a submerged pump is arranged in the underground tank and is connected with an external drainage pipeline, and a valve twelve is arranged on the external drainage pipeline.
A method for continuously vacuumizing an evaporation kettle comprises the following steps:
1) closing a valve ten and a valve eleven; keeping the one-way valve and the ejector unblocked;
2) opening valves I to ninth;
3) starting a circulating cooling pump;
4) starting a vacuum pump;
most of steam generated by the evaporation kettle is condensed after passing through the heat exchanger I, and condensate is discharged into an underground tank in a self-flowing mode; the non-condensable gas and a small part of condensate enter a vacuum collection tank for gas-liquid separation, and the separated liquid is discharged into an underground tank through a water seal tank in a self-flowing mode; the separated gas enters the ejector through the one-way valve and is pumped into the water tank;
5) the vacuum degree in the evaporation kettle is kept to be more than or equal to 60KPa by adjusting a valve IV and a valve VII; and exchanging heat with cooling water through a second heat exchanger, and keeping the temperature of circulating water in the water tank between 25 and 35 ℃.
A method for continuously vacuumizing an evaporation kettle further comprises a process of replacing circulating water in a water tank, and comprises the following specific steps:
1) determining whether to replace circulating water in the water tank or periodically replace the circulating water in the water tank by regularly observing the water quality condition in the water tank;
2) when circulating water is replaced, opening a valve ten and a valve eleven, supplementing clear water into the water tank, and allowing turbid water at the bottom of the water tank to flow to an underground tank through a drainage pipeline; during this process, the liquid level in the tank is maintained no lower than 4/5 for the highest liquid level;
3) observing circulating water in the water tank, and closing a valve ten and a valve eleven simultaneously after the circulating water becomes clear; or water supplementing time is set according to the volume of the water tank, and the valve ten and the valve eleven are closed after the water supplementing time is up.
The continuous vacuumizing method for the evaporation kettle further comprises a process of discharging collected liquid in an underground tank; the method comprises the following specific steps:
the valve twelve is in a long-open state, and the underground tank is provided with a liquid level detection device which is controlled by interlocking with the submerged pump, so that the automatic discharge of the collected liquid in the underground tank is realized.
Compared with the prior art, the invention has the beneficial effects that:
1) the purpose of continuously vacuumizing the evaporation kettle is achieved, the evaporation kettle can continuously run, the evaporation efficiency is improved, and the labor intensity of operators is reduced;
2) the noise pollution on site is reduced, the running stability of the system is improved, and the equipment maintenance frequency is reduced;
3) the potential safety hazard of equipment that leads to the vacuum pump to damage because of artificial misoperation is eliminated.
Drawings
FIG. 1 is a schematic structural diagram of a continuous vacuum-pumping system of an evaporation kettle according to the present invention.
In the figure: 1. evaporation kettle 2, heat exchanger I3, vacuum collection tank 4, water seal tank 5, underground tank 6, water tank 7, ejector 8, heat exchanger II 9, vacuum pump 10, circulating cooling pump 11, valve I12, valve II 13, valve III 14, valve IV 15, valve V16, valve VI 17, valve VII 18, valve VIII 19, valve VII 20, valve VII 21, valve IV 22, valve VII 23, submerged pump 24 and one-way valve
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in figure 1, the continuous vacuum-pumping system for the evaporation kettle comprises an evaporation kettle 1, a vacuum collection tank 3, a water seal tank 4, an underground tank 5, an ejector 7, a vacuum pump 9, a water tank 6, a first heat exchanger 2 and a second heat exchanger 8; a steam outlet at the top of the evaporation kettle 1 is connected with a steam inlet of a first heat exchanger 2 through a steam pipeline, a condensate outlet of the first heat exchanger 2 is connected with an underground tank 5 through a condensate pipeline, a gas-liquid outlet of the first heat exchanger 2 is connected with a gas-liquid inlet of a vacuum collection tank 3 through a gas-liquid pipeline, a liquid outlet of the vacuum collection tank 3 is connected with the underground tank 5 through a liquid pipeline, and a gas outlet of the vacuum collection tank 3 is connected with a gas inlet of a jet device 7 through a gas pipeline; the ejector 7 is arranged on a first circulating water pipeline of the water tank 6, and a vacuum pump 9 is arranged on the first circulating water pipeline; the water tank 6 is further provided with a second circulating water pipeline, and a second heat exchanger 8 is arranged on the second circulating water pipeline.
A check valve 24 is arranged on the gas pipeline at the upstream of the ejector 7.
A first valve 11 is arranged on the steam pipeline; a second valve 12 is arranged on the condensate pipeline; a third valve 13 is arranged on the gas-liquid pipeline; a fourth valve 14 is arranged on the gas pipeline; and a valve five 15 is arranged on the liquid pipeline.
A sixth valve 16 is arranged on the first circulating water pipeline on the upstream of the vacuum pump 9, and a seventh valve 17 is arranged on the first circulating water pipeline on the downstream of the vacuum pump 9.
And a circulating cooling pump 10 is arranged on the circulating water pipeline II, a valve eight 18 is arranged on the circulating water pipeline II at the upstream of the circulating cooling pump 10, and a valve nine 19 is arranged on the circulating water pipeline at the downstream of the circulating cooling pump 10.
The two circulating water pipelines are connected with the underground tank 5 through drainage pipelines, and valves ten 20 are arranged on the drainage pipelines; and a cooling water inlet pipeline of the second heat exchanger 8 is additionally connected with the water tank 6 through a water supplementing pipeline, and the water supplementing pipeline is provided with an eleventh valve 21.
And a submerged pump 23 is arranged in the underground tank 5, the submerged pump 23 is connected with an external drainage pipeline, and a valve twelve 22 is arranged on the external drainage pipeline.
A method for continuously vacuumizing an evaporation kettle comprises the following steps:
1) closing the valve eleven and the valve eleven 20 and 21; keeping the one-way valve 24 and the ejector 7 unblocked;
2) opening valves I to nine 11 to 19;
3) starting the circulating cooling pump 10;
4) starting the vacuum pump 9;
most of steam generated by the evaporation kettle 1 is condensed after passing through the heat exchanger I2, and condensate is discharged into an underground tank 5 in a self-flowing mode; the non-condensable gas and a small part of condensate enter a vacuum collection tank 3 for gas-liquid separation, and the separated liquid is discharged into an underground tank 5 through a water seal tank 4 in a self-flowing mode; the separated gas enters the ejector 7 through the one-way valve 24 and is pumped into the water tank 6;
5) the vacuum degree in the evaporation kettle 1 is kept to be more than or equal to 60KPa by adjusting a valve IV 14 and a valve VII 17; the temperature of the circulating water in the water tank 6 is kept between 25 ℃ and 35 ℃ through the second heat exchanger 8.
A method for continuously vacuumizing an evaporation kettle further comprises a process of replacing circulating water in a water tank, and comprises the following specific steps:
1) whether the circulating water in the water tank 6 is replaced or not is determined by regularly observing the water quality condition in the water tank 6, or the circulating water in the water tank 6 is replaced regularly;
2) when circulating water is replaced, the valve ten 20 and the valve eleven 21 are opened, clear water is supplemented into the water tank 6, and turbid water at the bottom of the water tank 6 flows to the underground tank 5 through a drainage pipeline; during this process, the liquid level in the tank 6 is kept no lower than 4/5 of the highest liquid level;
3) observing the circulating water in the water tank 6, and closing the valve ten 20 and the valve eleven 21 simultaneously after the circulating water becomes clear; or the water replenishing time is set according to the volume of the water tank 6, and the valves ten 20 and eleven 21 are closed after the water replenishing time is up.
The continuous vacuumizing method for the evaporation kettle further comprises a process of discharging collected liquid in an underground tank; the method comprises the following specific steps:
the valve twelve 22 is in a long-open state, and the underground tank 5 is provided with a liquid level detection device and is controlled by the submerged pump 23 in an interlocking manner, so that the automatic discharge of the collected liquid in the underground tank 5 is realized.
The circulating medium used by the system for continuously vacuumizing the evaporation kettle is industrial fresh water, the circulating liquid cooling pump is used as a power source, the circulating water in the water tank is continuously subjected to heat exchange with cooling water through the heat exchanger II, and the temperature of the circulating water is kept at about 30 ℃ so as to ensure the effect of vacuumizing the evaporation kettle.
When the water quality in the water tank becomes poor, the circulating water in the water tank is replaced through continuous supplement and continuous discharge operation.
The operation of vacuumizing the evaporation kettle and continuous supplement and continuous discharge is repeated, the evaporation kettle can be continuously vacuumized, and the continuous operation of the evaporation kettle is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A system for continuously vacuumizing an evaporation kettle is characterized by comprising the evaporation kettle, a vacuum collection tank, a water seal tank, an underground tank, an ejector, a vacuum pump, a water tank, a first heat exchanger and a second heat exchanger; a steam outlet at the top of the evaporation kettle is connected with a steam inlet of a first heat exchanger through a steam pipeline, a condensate outlet of the first heat exchanger is connected with an underground tank through a condensate pipeline, a gas-liquid outlet of the first heat exchanger is connected with a gas-liquid inlet of a vacuum collection tank through a gas-liquid pipeline, a liquid outlet of the vacuum collection tank is connected with the underground tank through a liquid pipeline, and a gas outlet of the vacuum collection tank is connected with a gas inlet of a jet device through a gas pipeline; the ejector is arranged on a first circulating water pipeline of the water tank, and a vacuum pump is arranged on the first circulating water pipeline; the water tank is also provided with a second circulating water pipeline, and a second heat exchanger is arranged on the second circulating water pipeline.
2. The system for continuously vacuumizing an evaporation kettle according to claim 1, wherein a check valve is arranged on a gas pipeline upstream of the ejector.
3. The system for continuously vacuumizing an evaporation kettle according to claim 1, wherein a first valve is arranged on the steam pipeline; a second valve is arranged on the condensate pipeline; a third valve is arranged on the gas-liquid pipeline; a fourth valve is arranged on the gas pipeline; and a fifth valve is arranged on the liquid pipeline.
4. The system according to claim 1, wherein a sixth valve is disposed on the first circulating water pipeline upstream of the vacuum pump, and a seventh valve is disposed on the first circulating water pipeline downstream of the vacuum pump.
5. The system of claim 1, wherein a second circulating water pipeline is provided with a circulating cooling pump, a second circulating water pipeline upstream of the circulating cooling pump is provided with a valve eight, and a second circulating water pipeline downstream of the circulating cooling pump is provided with a valve nine.
6. The system for continuously vacuumizing an evaporation kettle according to claim 1, wherein a circulating water pipeline two-way is connected with an underground tank through a drainage pipeline, and a valve ten is arranged on the drainage pipeline; and a cooling water inlet pipeline of the second heat exchanger is additionally connected with a water tank through a water supplementing pipeline, and the water supplementing pipeline is provided with an eleventh valve.
7. The system according to claim 1, wherein the underground tank is provided with a submerged pump, the submerged pump is connected with an external drainage pipeline, and the external drainage pipeline is provided with a valve twelve.
8. The method for continuously vacuumizing an evaporation kettle based on the system of any one of claims 1 to 7 is characterized by comprising the following steps:
1) closing a valve ten and a valve eleven; keeping the one-way valve and the ejector unblocked;
2) opening valves I to ninth;
3) starting a circulating cooling pump;
4) starting a vacuum pump;
most of steam generated by the evaporation kettle is condensed after passing through the heat exchanger I, and condensate is discharged into an underground tank in a self-flowing mode; the non-condensable gas and a small part of condensate enter a vacuum collection tank for gas-liquid separation, and the separated liquid is discharged into an underground tank through a water seal tank in a self-flowing mode; the separated gas enters the ejector through the one-way valve and is pumped into the water tank;
5) the vacuum degree in the evaporation kettle is kept to be more than or equal to 60KPa by adjusting a valve IV and a valve VII; and the temperature of the circulating water in the water tank is kept between 25 and 35 ℃ through the second heat exchanger.
9. The method for continuously vacuumizing an evaporation kettle according to claim 8, further comprising a water tank internal circulation water replacement process, which comprises the following specific steps:
1) determining whether to replace circulating water in the water tank or periodically replace the circulating water in the water tank by regularly observing the water quality condition in the water tank;
2) when circulating water is replaced, opening a valve ten and a valve eleven, supplementing clear water into the water tank, and allowing turbid water at the bottom of the water tank to flow to an underground tank through a drainage pipeline; during this process, the liquid level in the tank is maintained no lower than 4/5 for the highest liquid level;
3) observing circulating water in the water tank, and closing a valve ten and a valve eleven simultaneously after the circulating water becomes clear; or water supplementing time is set according to the volume of the water tank, and the valve ten and the valve eleven are closed after the water supplementing time is up.
10. The method for continuously vacuumizing an evaporation kettle according to claim 8, further comprising a liquid discharge process of a collection liquid of an underground tank; the method comprises the following specific steps:
the valve twelve is in a long-open state, and the underground tank is provided with a liquid level detection device which is controlled by interlocking with the submerged pump, so that the automatic discharge of the collected liquid in the underground tank is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011566486.7A CN112843754A (en) | 2020-12-25 | 2020-12-25 | System and method for continuously vacuumizing evaporation kettle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011566486.7A CN112843754A (en) | 2020-12-25 | 2020-12-25 | System and method for continuously vacuumizing evaporation kettle |
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| CN112843754A true CN112843754A (en) | 2021-05-28 |
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| CN202011566486.7A Pending CN112843754A (en) | 2020-12-25 | 2020-12-25 | System and method for continuously vacuumizing evaporation kettle |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0914868A (en) * | 1995-06-23 | 1997-01-17 | Mitsubishi Heavy Ind Ltd | Air extractor |
| CN206492223U (en) * | 2016-12-29 | 2017-09-15 | 山东丰元化学股份有限公司 | Evaporation in vacuo injection apparatus |
| CN107339895A (en) * | 2017-08-02 | 2017-11-10 | 宁波双屹节能环保科技有限公司 | One kind is used for the simple way of escape vacuum extractor of unclean steam-electric power |
| CN207012583U (en) * | 2017-05-22 | 2018-02-16 | 广西田东锦鑫化工有限公司 | Falling film evaporation system and its vacuum plant |
| CN210384862U (en) * | 2019-07-30 | 2020-04-24 | 河南心连心化学工业集团股份有限公司 | Urea evaporative condenser evacuating device |
| CN111252835A (en) * | 2020-01-16 | 2020-06-09 | 深圳瑞赛环保科技有限公司 | Waste liquid evaporation treatment method and heating and refrigerating method in waste liquid evaporation process |
-
2020
- 2020-12-25 CN CN202011566486.7A patent/CN112843754A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0914868A (en) * | 1995-06-23 | 1997-01-17 | Mitsubishi Heavy Ind Ltd | Air extractor |
| CN206492223U (en) * | 2016-12-29 | 2017-09-15 | 山东丰元化学股份有限公司 | Evaporation in vacuo injection apparatus |
| CN207012583U (en) * | 2017-05-22 | 2018-02-16 | 广西田东锦鑫化工有限公司 | Falling film evaporation system and its vacuum plant |
| CN107339895A (en) * | 2017-08-02 | 2017-11-10 | 宁波双屹节能环保科技有限公司 | One kind is used for the simple way of escape vacuum extractor of unclean steam-electric power |
| CN210384862U (en) * | 2019-07-30 | 2020-04-24 | 河南心连心化学工业集团股份有限公司 | Urea evaporative condenser evacuating device |
| CN111252835A (en) * | 2020-01-16 | 2020-06-09 | 深圳瑞赛环保科技有限公司 | Waste liquid evaporation treatment method and heating and refrigerating method in waste liquid evaporation process |
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Application publication date: 20210528 |
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