CN113476871A - Multi-effect evaporation control process for one-time tank passing by self pressure difference - Google Patents
Multi-effect evaporation control process for one-time tank passing by self pressure difference Download PDFInfo
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- CN113476871A CN113476871A CN202110617351.7A CN202110617351A CN113476871A CN 113476871 A CN113476871 A CN 113476871A CN 202110617351 A CN202110617351 A CN 202110617351A CN 113476871 A CN113476871 A CN 113476871A
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- liquid level
- level control
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- 238000001704 evaporation Methods 0.000 title claims abstract description 66
- 230000008020 evaporation Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 115
- 235000011389 fruit/vegetable juice Nutrition 0.000 claims abstract description 30
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000012141 concentrate Substances 0.000 claims abstract description 4
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 9
- 238000009835 boiling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 239000010865 sewage Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B01D1/26—Multiple-effect 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)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a multi-effect evaporation control process for one-time tank passing by self pressure difference, which comprises the following steps: 1) the solution to be evaporated and concentrated enters an evaporation tank through a raw material pipe and passes through a heating pipe in the evaporation tank, so that the solution becomes concentrated solution; 2) the concentrated solution boils and rises in the heating pipe, flows into the gas-liquid separation and liquid level control box, does not flow back to be mixed with the concentrated solution materials in the tank, and realizes one-time quick tank passing; 3) a liquid level control plate is arranged in the vapor-liquid separation and liquid level control box, and the liquid level height is controlled through the height of the liquid level control plate; 4) the discharge area of vapor-liquid separation and liquid level control case links to each other with the liquid seal device, and the liquid seal device utilizes concentrate self gravity to offset the pressure differential between the adjacent evaporating pot, prevents to crowd vapour and appears, utilizes the pressure differential between the adjacent evaporating pot to send into next evaporating pot with the material simultaneously. The invention can automatically control the liquid level of each effect of evaporation, and the evaporation in the tank is not circulated, so that the juice can be quickly extracted at one time.
Description
Technical Field
The invention relates to the technical field of evaporation and concentration, in particular to a multi-effect evaporation control process for one-time tank passing by self pressure difference.
Background
Evaporation concentration is a common process in the production process of chemical industry, food industry and the like, and simply refers to a process of evaporating water in a solution by heating so as to increase the concentration of a solute. In order to reduce energy consumption in the evaporation and concentration process in the production process of enterprises, the evaporation liquid level needs to be controlled in a reasonable range so as to achieve good evaporation efficiency.
At present, materials to be evaporated and concentrated are evaporated and concentrated in a multi-effect evaporation tank, concentrated juice evaporated in the evaporation tank can be repeatedly evaporated in an internal circulation mode, an external circulation mode or an internal and external double circulation mode, and a large amount of circulation can only increase the throughput of the materials in a heating pipe, so that the evaporation efficiency is reduced, and the energy consumption is improved. Because the heat transfer efficiency is not changed, the material basically keeps a higher heat transfer coefficient according to the property of the dilute juice in the process of changing the dilute juice into the concentrated juice and vaporizing and rising in the heating pipe, so the heat transfer coefficient is higher when the concentrated solution is thinner. The average concentration of the concentrated solution which rises from the heating pipe of the evaporation tank with circulation is close to that of the juice, so that the heat transfer coefficient is reduced, and the static pressure loss is increased. The area circulation evaporating pot need be controlled income juice and go out the juice, requires very high to liquid level control, and the degree of difficulty is also big, and too low liquid level can lead to the evaporation to influence evaporation utilization ratio, and too high liquid level can increase static pressure loss and influence energy consumption and evaporation efficiency. Due to the fact that juice flows into the bottom and flows out of the bottom, if convection circulation is not good, the situation that the evaporated concentrated juice is locally too thick and locally too thin is easily caused, and the local concentrated juice stays for too long time to cause color increasing.
The existing evaporation concentration control generally utilizes a throttling mode of a mechanical valve to control the liquid level in an evaporation tank: there are manual empirical controls and also automated controls with automated instrumentation. The manual experience operation control has high requirements on the experience of workers, low efficiency, more valves and high labor intensity, and particularly, a multi-effect evaporation system has high hysteresis and is difficult to control stably; the automatic control of the automatic instrument can detect the process liquid level in real time, and the liquid level of each evaporation tank is automatically adjusted through the automatic control valve, although the labor intensity of workers is greatly reduced, the liquid level control is greatly influenced because the evaporation intensity change of each effect and the pressure difference between the tanks influence the liquid level measurement, and the liquid level automatic control needs a long time for stabilizing a large-lag multi-effect evaporation system, and the control effect can be influenced by slight disturbance of one index.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a multi-effect evaporation control process for passing through a tank at one time by means of self pressure difference, the technical problems existing in the traditional evaporation control process are solved, the liquid level of each effect of evaporation can be automatically controlled only by keeping a pipeline through which materials flow smoothly without any intervention on a valve, evaporation in the tank is not circulated, juice can be rapidly discharged at one time, the retention time of the materials in the tank is shortened, the coloring is reduced, the static pressure loss is reduced, the evaporation efficiency is improved, and the concentrated juice is uniform and stable.
The technical scheme adopted by the invention is as follows: provides a multi-effect evaporation control process for one-time tank passing by self pressure difference, which comprises the following steps:
1) the solution to be evaporated and concentrated enters an evaporation tank through a raw material pipe and passes through a heating pipe in the evaporation tank, heating steam heats the solution in the heating pipe, moisture in the solution is evaporated and pumped away, and the solution becomes concentrated solution;
2) the concentrated solution rises in the heating pipe by boiling, one part of the concentrated solution flows into the juice outlet ring groove and enters the vapor-liquid separation and liquid level control box through the juice outlet pipe, the other part of the concentrated solution flows into the liquid descending pipe, enters the inner juice outlet pipe from the lower end of the liquid descending pipe and flows into the vapor-liquid separation and liquid level control box, and does not flow back to be mixed with the concentrated solution material in the tank, so that the disposable rapid tank passing is realized;
3) the vapor-liquid separation and liquid level control box is internally provided with a liquid level control plate, the vapor-liquid separation and liquid level control box is divided into a feeding area and a discharging area by the liquid level control plate, the upper end of the liquid level control plate is spaced from the top plate of the vapor-liquid separation and liquid level control box, the discharging area is communicated with a U-shaped pipeline or a liquid seal device with a cavity, and the concentrated liquid flowing out of the outer juice outlet pipe and the inner juice outlet pipe flows into the feeding area of the vapor-liquid separation and liquid level control box; after the concentrated solution enters a feeding area of the vapor-liquid separation and liquid level control box, the liquid level height is controlled through the height of the liquid level control plate, and when the concentrated solution overflows the liquid level control plate, the concentrated solution enters a discharging area;
4) the discharge area of vapor-liquid separation and liquid level control case links to each other with the liquid seal device, and the other end of liquid seal device and the feed inlet intercommunication of next evaporating pot utilize concentrate self gravity to offset the pressure differential between the adjacent evaporating pot, prevent that the cluster vapour from appearing, utilize the pressure differential between the adjacent evaporating pot to send the material into next evaporating pot simultaneously.
Preferably, the height of the liquid level control plate is between the lowest height and the highest height of the heating pipe in the evaporation tank of the stage.
Compared with the prior art, the invention has the following advantages: the invention avoids the defects caused by the participation of the traditional evaporation system in control through manpower or instruments and meters, only the valves for passing the concentrated solution are required to be opened completely, the concentrated solution passes through a vapor-liquid separation and liquid level control box and a liquid sealing device, and the one-time rapid tank passing is completed by the pressure difference of two adjacent evaporation tanks, thereby effectively solving the instability of manual intervention and instrument and meter control; the material retention time is short, the material does not flow back, low liquid level evaporation can be realized, the tank is not closed, the static pressure loss is effectively reduced, the heat transfer efficiency is fully utilized, the evaporation energy consumption is reduced, energy is saved, emission is reduced, and the concentrated juice prepared by evaporation is uniform and stable. For the sugar industry, the fast-in and fast-out mode effectively reduces the residence time of sugar juice, reduces the color increasing, reduces the sugar conversion loss and improves the product recovery.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
FIG. 2 is a schematic structural diagram of the apparatus of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
As shown in figures 1 and 2, the invention relates to a multi-effect evaporation control process for one-time tank passing by self pressure difference, which comprises the following steps:
1) the solution to be evaporated and concentrated enters an evaporation tank 6 through a raw material pipe 7, and the solution in the heating pipe is heated by heating steam through a heating pipe in the evaporation tank 6, so that the moisture in the solution is evaporated and pumped away, and the solution becomes concentrated solution;
2) the concentrated solution rises in the heating pipe by boiling, one part of the concentrated solution flows into the juice outlet ring groove and enters the vapor-liquid separation and liquid level control box 2 through the juice outlet pipe 1, the other part of the concentrated solution flows into the down-flow pipe, enters the inner juice outlet pipe 4 from the lower end of the down-flow pipe and flows into the vapor-liquid separation and liquid level control box 2, and does not flow back to be mixed with the concentrated solution material, so that the disposable rapid tank passing is realized;
3) a liquid level control plate is arranged in the vapor-liquid separation and liquid level control box 2, the vapor-liquid separation and liquid level control box 2 is divided into a feeding area and a discharging area by the liquid level control plate, the upper end of the liquid level control plate is spaced from the top plate of the vapor-liquid separation and liquid level control box, the discharging area is communicated with a U-shaped pipeline or a liquid seal device 3 of a cavity, and the concentrated liquid flowing out of the outer juice outlet pipe 1 and the inner juice outlet pipe 4 flows into the feeding area of the vapor-liquid separation and liquid level control box 2 in a uniform flow manner; after the concentrated solution enters a feeding area of the vapor-liquid separation and liquid level control box 2, the liquid level height is controlled through the height of the liquid level control plate, and when the concentrated solution overflows the liquid level control plate, the concentrated solution enters a discharging area;
4) the ejection of compact district and the liquid seal device 3 of vapor-liquid separation and liquid level control case link to each other, and the other end of liquid seal device 3 and the feed inlet intercommunication of next evaporating pot, and liquid seal device 3 utilizes concentrate self gravity to offset the pressure differential between the adjacent evaporating pot 6, prevents to cluster vapour and appears, utilizes the pressure differential between the adjacent evaporating pot 6 to send into next evaporating pot 6 with the material simultaneously.
When the invention is used in detail, the height of the liquid level control plate is between the lowest height and the highest height of the heating pipe in the evaporation tank 6 of the same level, and the liquid level control plate is set as a height-adjustable control plate. The liquid seal device 3 adopts a U-shaped pipe, the lowest end of the U-shaped pipe is communicated with a sewage discharge pipe, and the sewage discharge pipe is provided with a sewage discharge pump 5.
It should be noted that the above-described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (2)
1. A multi-effect evaporation control process for one-time tank passing by self pressure difference is characterized by comprising the following steps:
1) the solution to be evaporated and concentrated enters an evaporation tank through a raw material pipe and passes through a heating pipe in the evaporation tank, heating steam heats the solution in the heating pipe, moisture in the solution is evaporated and pumped away, and the solution becomes concentrated solution;
2) the concentrated solution rises in the heating pipe by boiling, one part of the concentrated solution flows into the juice outlet ring groove and enters the vapor-liquid separation and liquid level control box through the juice outlet pipe, the other part of the concentrated solution flows into the liquid descending pipe, enters the inner juice outlet pipe from the lower end of the liquid descending pipe and flows into the vapor-liquid separation and liquid level control box, and does not flow back to be mixed with the concentrated solution material in the tank, so that the disposable rapid tank passing is realized;
3) the vapor-liquid separation and liquid level control box is internally provided with a liquid level control plate, the vapor-liquid separation and liquid level control box is divided into a feeding area and a discharging area by the liquid level control plate, the upper end of the liquid level control plate is spaced from the top plate of the vapor-liquid separation and liquid level control box, the discharging area is communicated with a U-shaped pipeline or a liquid seal device with a cavity, and the concentrated liquid flowing out of the outer juice outlet pipe and the inner juice outlet pipe flows into the feeding area of the vapor-liquid separation and liquid level control box; after the concentrated solution enters a feeding area of the vapor-liquid separation and liquid level control box, the liquid level height is controlled through the height of the liquid level control plate, and when the concentrated solution overflows the liquid level control plate, the concentrated solution enters a discharging area;
4) the discharge area of vapor-liquid separation and liquid level control case links to each other with the liquid seal device, and the other end of liquid seal device and the feed inlet intercommunication of next evaporating pot utilize concentrate self gravity to offset the pressure differential between the adjacent evaporating pot, prevent that the cluster vapour from appearing, utilize the pressure differential between the adjacent evaporating pot to send the material into next evaporating pot simultaneously.
2. The multi-effect evaporation control process of one-time tank passing by self pressure difference as claimed in claim 1, characterized in that: the height of the liquid level control plate is between the lowest height and the highest height of the heating pipe in the evaporation tank of the stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110617351.7A CN113476871A (en) | 2021-06-03 | 2021-06-03 | Multi-effect evaporation control process for one-time tank passing by self pressure difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110617351.7A CN113476871A (en) | 2021-06-03 | 2021-06-03 | Multi-effect evaporation control process for one-time tank passing by self pressure difference |
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| CN113476871A true CN113476871A (en) | 2021-10-08 |
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| CN202110617351.7A Pending CN113476871A (en) | 2021-06-03 | 2021-06-03 | Multi-effect evaporation control process for one-time tank passing by self pressure difference |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116081688A (en) * | 2022-12-30 | 2023-05-09 | 靖西天桂铝业有限公司 | Method for preparing calcium vanadate from aluminum oxide mother liquor and extracting gallium cooperatively |
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|---|---|---|---|---|
| GB928470A (en) * | 1961-01-31 | 1963-06-12 | Atomic Energy Authority Uk | Improvements in or relating to control systems for a multi-effect evaporator |
| CN1041111A (en) * | 1988-09-16 | 1990-04-11 | 张修清 | Multifunctional evaporating equipment and liquid level controlling method |
| JPH0985005A (en) * | 1995-09-22 | 1997-03-31 | Ebara Corp | Concentrating and distilling apparatus provided with liquid surface controlling mechanism |
| CN104248859A (en) * | 2014-09-12 | 2014-12-31 | 四川大学 | Falling film evaporation process in single-way multi-effect stand pipe and equipment configuration method |
| CN106054948A (en) * | 2016-05-25 | 2016-10-26 | 江苏康缘药业股份有限公司 | Volatile oil stable collection device in artemisia carvifolia extraction process and control method thereof |
| CN108201703A (en) * | 2017-12-18 | 2018-06-26 | 美清科技（北京）有限公司 | Liquid vaporising unit and liquid evaporation technique |
| CN109731358A (en) * | 2019-02-15 | 2019-05-10 | 陕西陕化煤化工集团有限公司 | A kind of evaporation concentration system |
| CN210448119U (en) * | 2019-08-15 | 2020-05-05 | 中触媒新材料股份有限公司 | Continuous enrichment facility of quaternary ammonium alkaline aqueous solution |
| EP3785781A1 (en) * | 2019-08-30 | 2021-03-03 | Distillerie Mazzari S.p.A. | Plant and process for concentrating tartaric acid |
-
2021
- 2021-06-03 CN CN202110617351.7A patent/CN113476871A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB928470A (en) * | 1961-01-31 | 1963-06-12 | Atomic Energy Authority Uk | Improvements in or relating to control systems for a multi-effect evaporator |
| CN1041111A (en) * | 1988-09-16 | 1990-04-11 | 张修清 | Multifunctional evaporating equipment and liquid level controlling method |
| JPH0985005A (en) * | 1995-09-22 | 1997-03-31 | Ebara Corp | Concentrating and distilling apparatus provided with liquid surface controlling mechanism |
| CN104248859A (en) * | 2014-09-12 | 2014-12-31 | 四川大学 | Falling film evaporation process in single-way multi-effect stand pipe and equipment configuration method |
| CN106054948A (en) * | 2016-05-25 | 2016-10-26 | 江苏康缘药业股份有限公司 | Volatile oil stable collection device in artemisia carvifolia extraction process and control method thereof |
| CN108201703A (en) * | 2017-12-18 | 2018-06-26 | 美清科技（北京）有限公司 | Liquid vaporising unit and liquid evaporation technique |
| CN109731358A (en) * | 2019-02-15 | 2019-05-10 | 陕西陕化煤化工集团有限公司 | A kind of evaporation concentration system |
| CN210448119U (en) * | 2019-08-15 | 2020-05-05 | 中触媒新材料股份有限公司 | Continuous enrichment facility of quaternary ammonium alkaline aqueous solution |
| EP3785781A1 (en) * | 2019-08-30 | 2021-03-03 | Distillerie Mazzari S.p.A. | Plant and process for concentrating tartaric acid |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116081688A (en) * | 2022-12-30 | 2023-05-09 | 靖西天桂铝业有限公司 | Method for preparing calcium vanadate from aluminum oxide mother liquor and extracting gallium cooperatively |
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Application publication date: 20211008 |
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