CN111701261A - Gas and liquid guiding and distributing device of falling film evaporator - Google Patents
Gas and liquid guiding and distributing device of falling film evaporator Download PDFInfo
- Publication number
- CN111701261A CN111701261A CN202010571006.XA CN202010571006A CN111701261A CN 111701261 A CN111701261 A CN 111701261A CN 202010571006 A CN202010571006 A CN 202010571006A CN 111701261 A CN111701261 A CN 111701261A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
-
- 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
Abstract
The invention relates to a gas and liquid guiding and distributing device of a falling film evaporator, which is characterized in that: the upper distribution disc, the lower distribution disc and the tube plate are fixedly connected through supporting screws, a plurality of upper distribution disc distribution holes are formed in the upper distribution disc, the lower distribution disc is provided with air guide tubes, a plurality of lower distribution disc distribution holes are formed in the periphery of the air guide tubes at equal intervals by taking a circle as a track, and the air guide tubes and the peripheral lower distribution disc distribution holes form air guide liquid distribution units; the tube plate is provided with a film falling tube, the air duct extends into the film falling tube, and a drainage tube is welded at the position of the air duct between the tube plate and the lower distribution plate. The liquid distribution device has the advantages of scientific and reasonable structural design, compact structure, strong liquid distribution capability, good liquid distribution effect and high liquid distribution efficiency, and can well complete liquid distribution even in large flow.
Description
Technical Field
The invention belongs to the field of falling film evaporation, relates to a falling film evaporator, and particularly relates to a gas and liquid guiding and distributing device of the falling film evaporator.
Background
The falling film evaporator has the advantages of high heat transfer coefficient, small heat transfer temperature difference loss, easy realization of multiple effects, easy treatment of heat-sensitive materials and the like, and is widely applied to chemical industry, metallurgy, light industry, food processing, medicine, seawater desalination and other industrial departments. In order to uniformly distribute the liquid into each film-falling tube and uniformly distribute the film along the circumference of the tube, a liquid distributor is required to be arranged. The liquid distribution device with reasonable structure and good performance can ensure that the liquid is uniformly distributed on each film falling pipe and can quickly distribute the liquid along the periphery of the pipe to form a film.
However, the film distribution of the falling film tube is not uniform due to unreasonable structure of the liquid distributor, flow change and the like in the actual production process, so that the phenomena of drift, liquid film breakage and even dry wall at the bottom of the falling film tube occur, and the heat transfer performance of the liquid film in the other tubes is reduced due to the excessive thickness of the liquid film in the other tubes. In addition, in the evaporation process, secondary steam from the membrane falling pipe flows transversely along the bottom of the plate when rising to the lower distribution plate, certain impact is generated on material liquid falling to the pipe plate, liquid flow can deviate under the interference of the secondary steam, and the liquid flow cannot fall in a designated area of the pipe plate as required, so that uneven distribution is caused. Because the air duct that sets up the distribution disc down does not laminate with falling liquid film pipe in the vertical direction, the skew can take place for flash steam flow when large-traffic, boiling feeding of crossing, and the material flows disorderly, also can lead to the cloth membrane inequality, not only increases equipment cleaning time like this, reduces production capacity, still can influence product quality, and equipment can not move when serious.
Therefore, based on the problems, the invention designs the gas and liquid guiding and distributing device of the high-efficiency falling-film evaporator.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a gas and liquid guiding and distributing device of a falling film evaporator, which is compact in structure, strong in liquid distributing capacity, good in liquid distributing effect and high in liquid distributing efficiency, and can well distribute liquid when the flow rate is large.
The technical problem to be solved by the invention is realized by the following technical scheme:
a falling film evaporator air guide liquid distribution device is characterized in that: the gas-liquid separation device comprises an upper distribution disc, a lower distribution disc and a tube plate, wherein the upper distribution disc, the lower distribution disc and the tube plate are fixedly connected through supporting screws, a plurality of upper distribution disc distribution holes are formed in the upper distribution disc, gas guide pipes are arranged on the lower distribution disc, a plurality of lower distribution disc distribution holes are formed in the lower distribution disc at equal intervals around the gas guide pipes by taking a circle as a track, and gas guide pipes and peripheral lower distribution disc distribution holes form gas-liquid distribution units; the tube plate is provided with a film falling tube, the air guide tube extends into the film falling tube, and a drainage tube is welded at the position between the tube plate and the lower distribution plate.
And the lower end of the air duct is expanded to form a bell mouth.
And a sawtooth distribution head is arranged at the top end of the film falling pipe.
And a plurality of upper distribution plate distribution holes on the upper distribution plate are distributed in a regular hexagon shape.
And the drainage cylinder is of a hollow structure and comprises a vertical section and a drainage section, and the diameter of the bottom end of the drainage section is larger than that of the air guide liquid distribution unit.
Moreover, the drainage section is an arc-shaped drainage section.
Moreover, the diameter of the bottom surface of the drainage cylinder is more than 10mm larger than that of the falling film tube, and the distance between the bottom end of the drainage cylinder and the top end of the falling film tube is more than 20 mm.
And cofferdams are arranged on the upper distribution disc and the lower distribution disc, and the top end of the gas-guide tube is higher than the height of the cofferdam on the lower distribution.
And a distance tube is arranged outside the supporting screw.
The invention has the advantages and beneficial effects that:
1. the invention relates to an air guide and liquid distribution device of a falling film evaporator, which comprises an upper distribution disc, a lower distribution disc and a tube plate, wherein the upper distribution disc, the lower distribution disc and the tube plate are fixedly connected through a support screw; the tube plate is provided with the falling film tube, the air guide tube extends into the falling film tube, and the drainage tube is welded at the position of the air guide tube between the tube plate and the lower distribution disc.
2. According to the air-guiding liquid-distributing device of the falling film evaporator, the lower end of the air-guiding pipe is expanded to form a horn mouth, the air-guiding pipe has the function of an insert type liquid distributor, the integral liquid-distributing capacity is improved, and the phenomena of local wall dryness and coking caused by bias flow are avoided; and still have the cloth liquid effect of preferred when large-traffic, have great operation elasticity, cloth liquid ability reinforce.
3. According to the air guide and liquid distribution device of the falling film evaporator, the sawtooth distribution head is arranged at the top end of the falling film tube and is matched with the bell mouth at the head of the air guide tube to distribute films, so that the liquid distribution uniformity is ensured.
4. According to the air guide and liquid distribution device of the falling film evaporator, the distribution holes of the upper distribution plate on the upper distribution plate are distributed in a regular hexagon shape, so that multiple liquid flows of the air guide and liquid distribution unit fall from the distribution holes of the upper distribution plate, and the liquid flows more stably.
5. According to the air guide and liquid distribution device of the falling film evaporator, the drainage cylinder is of a hollow structure and comprises the vertical section and the drainage section, the diameter of the bottom end of the drainage section is larger than that of the air guide and liquid distribution unit, and the liquid flowing down in a trickle shape on the distribution holes of the lower distribution plate can be ensured to fall on the drainage section completely.
6. According to the air guide and liquid distribution device of the falling film evaporator, the drainage section is an arc-shaped drainage section and is used for buffering and draining liquid so as to uniformly distribute the liquid on the tube bridge of the tube plate.
7. According to the gas and liquid distribution device of the falling film evaporator, the diameter of the bottom surface of the drainage cylinder is larger than that of the falling film pipe by more than 10mm, and the distance between the bottom end of the drainage cylinder and the top end of the falling film pipe is larger than 20mm, so that the liquid distribution uniformity is ensured.
8. According to the air and liquid distribution device of the falling film evaporator, the upper distribution disc and the lower distribution disc are both provided with the cofferdams, and the top end of the air guide pipe is higher than the height of the cofferdams on the lower distribution disc, so that the overflow of the liquid material is prevented, and the liquid distribution effect is ensured.
9. According to the air guide and liquid distribution device of the falling film evaporator, the distance tube is arranged outside the supporting screw, so that the connection firmness between the upper distribution plate and the tube plate, the lower distribution plate and the tube plate is enhanced, and the working stability is ensured.
10. The liquid distribution device has the advantages of scientific and reasonable design, compact structure, strong liquid distribution capability, good liquid distribution effect and high liquid distribution efficiency, and can well complete liquid distribution even in large flow.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the drainage tube of the present invention;
fig. 3 is a partial structural view of the lower distribution plate of the present invention.
Description of the reference numerals
1-upper distribution plate, 2-upper distribution plate distribution holes, 21-upper distribution plate distribution hole projection holes, 3-lower distribution plate, 4-gas guide tube, 5-lower distribution plate distribution holes, 6-drainage tube, 61-vertical section, 62-drainage section, 63-drainage tube projection tube, 7-sawtooth distribution head, 8-tube plate, 9-membrane lowering tube, 10-support screw, 11-distance tube, 12-cofferdam and 13-gas guide liquid distribution unit.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The gas and liquid guiding and distributing device of the falling film evaporator is characterized in that: the device comprises an upper distribution disc 1, a lower distribution disc 3 and a tube plate 8, wherein the upper distribution disc, the lower distribution disc and the tube plate are fixedly connected through a support screw 10, a plurality of upper distribution disc distribution holes 2 are formed in the upper distribution disc, the projection of the upper distribution disc distribution holes on the lower distribution disc is upper distribution disc distribution hole projection holes 21, air guide pipes 4 are arranged on the lower distribution disc, a plurality of lower distribution disc distribution holes 5 are formed in the periphery of the air guide pipes at equal intervals by taking a circle as a track, and the air guide pipes and the peripheral lower distribution disc distribution holes form an air guide liquid distribution unit 13; the tube plate is provided with the falling film tube 9, the air duct stretches into the falling film tube, the part of the air duct between the tube plate and the lower distribution disc is welded with the drainage cylinder 6, the projection of the drainage cylinder on the lower distribution disc is a drainage cylinder projection cylinder 63, the structure is compact, the liquid distribution capacity is strong, the liquid distribution can be well completed when the flow rate is large, the liquid distribution effect is good, and the liquid distribution efficiency is high.
The lower end of the air duct expands to form a bell mouth, the air duct has the function of an insert type liquid distributor, the integral liquid distribution capacity is improved, and the phenomena of local wall dryness and coking caused by bias flow are avoided; and still have the cloth liquid effect of preferred when large-traffic, have great operation elasticity, cloth liquid ability reinforce.
The top end of the film falling pipe is provided with a sawtooth distribution head 7 which is matched with the horn mouth of the head of the air guide pipe to distribute the film, so that the uniformity of liquid distribution is ensured.
The distribution holes of the upper distribution discs are distributed in a regular hexagon shape, so that the air guide liquid distribution unit has a plurality of liquid flows falling from the distribution holes of the upper distribution discs, and the liquid flows more stably.
The drainage tube is of a hollow structure and comprises a vertical section 61 and a drainage section 62, the diameter of the bottom end of the drainage section is larger than that of the air guide liquid distribution unit, and liquid flowing down in a trickle shape on distribution holes of the lower distribution plate can be enabled to fall on the drainage section completely.
The drainage section is an arc drainage section and is used for buffering and draining the material liquid so as to uniformly distribute the material liquid on the tube bridge of the tube plate.
The diameter of the bottom surface of the drainage cylinder is more than 10mm larger than that of the falling film tube, and the distance between the bottom end of the drainage cylinder and the top end of the falling film tube is more than 20mm, so that the liquid distribution uniformity is ensured.
Cofferdam 12 is arranged on the upper distribution disc and the lower distribution disc, and the top end of the gas-guide tube is higher than the height of the Cofferdam on the lower distribution disc, so that the overflow of the feed liquid is prevented, and the liquid distribution effect is ensured.
The distance tubes 11 are arranged outside the supporting screws, so that the connection firmness between the upper distribution plate and the lower distribution plate and between the tube plates is enhanced, and the working stability is ensured.
The working principle of the invention is as follows:
the feed liquid uniformly falls on the tube bridge of the air guide liquid distribution unit through the upper distribution plate distribution holes 2 which are distributed in a regular hexagon shape, and falls on the drainage cylinder 6 in a trickle shape through the lower distribution plate distribution holes 5, and the feed liquid is uniformly distributed on the tube bridge of the tube plate 8 through the buffering and drainage functions of the drainage cylinder 6; when the liquid level of feed liquid reaches behind the take-up height and gets into through 7 overflows of sawtooth distribution head and fall membrane pipe 9 and accomplish the cloth membrane, when the flow increase, 4 heads of air duct can have "plug-in components type" liquid distributor's effect concurrently through the expand tube formation horn mouth, carry out the secondary cloth membrane to the uneven feed liquid of cloth membrane, overflow type distributor and plug-in components type distributor combine together, and multiple spot cloth and cloth membrane are even, and the operation is reliable and stable.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (9)
1. A falling film evaporator air guide liquid distribution device is characterized in that: the gas-liquid separation device comprises an upper distribution disc, a lower distribution disc and a tube plate, wherein the upper distribution disc, the lower distribution disc and the tube plate are fixedly connected through supporting screws, a plurality of upper distribution disc distribution holes are formed in the upper distribution disc, gas guide pipes are arranged on the lower distribution disc, a plurality of lower distribution disc distribution holes are formed in the lower distribution disc at equal intervals around the gas guide pipes by taking a circle as a track, and gas guide pipes and peripheral lower distribution disc distribution holes form gas-liquid distribution units; the tube plate is provided with a film falling tube, the air guide tube extends into the film falling tube, and a drainage tube is welded at the position between the tube plate and the lower distribution plate.
2. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: and the lower end of the air duct is expanded to form a horn mouth.
3. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: the top end of the film falling pipe is provided with a sawtooth distribution head.
4. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: and a plurality of upper distribution disc distribution holes on the upper distribution disc are distributed in a regular hexagon shape.
5. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: the drainage cylinder is of a hollow structure and comprises a vertical section and a drainage section, and the diameter of the bottom end of the drainage section is larger than that of the air guide liquid distribution unit.
6. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: the drainage section is an arc drainage section.
7. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: the diameter of the bottom surface of the drainage cylinder is more than 10mm larger than that of the falling film tube, and the distance between the bottom end of the drainage cylinder and the top end of the falling film tube is more than 20 mm.
8. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: cofferdams are arranged on the upper distribution disc and the lower distribution disc, and the top end of the gas-guide tube is higher than the height of the cofferdams on the lower distribution.
9. The falling film evaporator gas and liquid distribution device according to claim 1, characterized in that: a distance tube is arranged outside the supporting screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010571006.XA CN111701261A (en) | 2020-06-22 | 2020-06-22 | Gas and liquid guiding and distributing device of falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010571006.XA CN111701261A (en) | 2020-06-22 | 2020-06-22 | Gas and liquid guiding and distributing device of falling film evaporator |
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| Publication Number | Publication Date |
|---|---|
| CN111701261A true CN111701261A (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010571006.XA Pending CN111701261A (en) | 2020-06-22 | 2020-06-22 | Gas and liquid guiding and distributing device of falling film evaporator |
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| CN (1) | CN111701261A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112274956A (en) * | 2020-10-19 | 2021-01-29 | 扬州大学 | Falling film evaporator and falling film evaporation method thereof |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3175962A (en) * | 1961-02-28 | 1965-03-30 | Gen Electric | Falling film evaporator |
| DE2604389A1 (en) * | 1976-02-05 | 1977-08-18 | Metallgesellschaft Ag | METHOD AND DEVICE FOR EQUAL FEEDING OF HEATING TUBES IN FALL-FILM EVAPORATORS |
| EP0780146A1 (en) * | 1995-12-21 | 1997-06-25 | Balcke-Dürr GmbH | Steam-heated apparatus for evaporating and thickening liquids |
| CN203342404U (en) * | 2013-06-19 | 2013-12-18 | 上海神农机械有限公司 | Three-overflow distributor with sawtoothed guide pipes and for falling film evaporator |
| CN104014142A (en) * | 2014-06-24 | 2014-09-03 | 天津普莱化工技术有限公司 | Efficient liquid distributor for falling-film evaporator |
| CN204380291U (en) * | 2015-01-13 | 2015-06-10 | 中国矿业大学 | A kind of falling film evaporator cone hat type liquid distributing board |
| CN204952314U (en) * | 2015-08-26 | 2016-01-13 | 浙江森力机械科技股份有限公司 | Tertiary falling liquid film distributing type heater |
| CN205145629U (en) * | 2015-11-25 | 2016-04-13 | 天津中瑞药业股份有限公司 | Falling film evaporation ware liquid distributor structure |
| CN205199004U (en) * | 2015-12-15 | 2016-05-04 | 江阴中南重工有限公司 | Vertical falling film evaporation ware |
| CN208097434U (en) * | 2018-02-23 | 2018-11-16 | 烟台国邦化工机械科技有限公司 | A kind of falling film evaporator distributor |
| CN209865335U (en) * | 2019-04-03 | 2019-12-31 | 无锡化工装备股份有限公司 | Overflow tooth-shaped taper type pipe orifice film distributor |
| CN209984960U (en) * | 2019-04-28 | 2020-01-24 | 江苏纵横浓缩干燥设备有限公司 | Falling film evaporator with high heat energy utilization efficiency |
| CN210044882U (en) * | 2019-01-22 | 2020-02-11 | 昆山三一环保科技有限公司 | Even liquid distribution structure of falling film evaporator feed liquid |
-
2020
- 2020-06-22 CN CN202010571006.XA patent/CN111701261A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3175962A (en) * | 1961-02-28 | 1965-03-30 | Gen Electric | Falling film evaporator |
| DE2604389A1 (en) * | 1976-02-05 | 1977-08-18 | Metallgesellschaft Ag | METHOD AND DEVICE FOR EQUAL FEEDING OF HEATING TUBES IN FALL-FILM EVAPORATORS |
| EP0780146A1 (en) * | 1995-12-21 | 1997-06-25 | Balcke-Dürr GmbH | Steam-heated apparatus for evaporating and thickening liquids |
| CN203342404U (en) * | 2013-06-19 | 2013-12-18 | 上海神农机械有限公司 | Three-overflow distributor with sawtoothed guide pipes and for falling film evaporator |
| CN104014142A (en) * | 2014-06-24 | 2014-09-03 | 天津普莱化工技术有限公司 | Efficient liquid distributor for falling-film evaporator |
| CN204380291U (en) * | 2015-01-13 | 2015-06-10 | 中国矿业大学 | A kind of falling film evaporator cone hat type liquid distributing board |
| CN204952314U (en) * | 2015-08-26 | 2016-01-13 | 浙江森力机械科技股份有限公司 | Tertiary falling liquid film distributing type heater |
| CN205145629U (en) * | 2015-11-25 | 2016-04-13 | 天津中瑞药业股份有限公司 | Falling film evaporation ware liquid distributor structure |
| CN205199004U (en) * | 2015-12-15 | 2016-05-04 | 江阴中南重工有限公司 | Vertical falling film evaporation ware |
| CN208097434U (en) * | 2018-02-23 | 2018-11-16 | 烟台国邦化工机械科技有限公司 | A kind of falling film evaporator distributor |
| CN210044882U (en) * | 2019-01-22 | 2020-02-11 | 昆山三一环保科技有限公司 | Even liquid distribution structure of falling film evaporator feed liquid |
| CN209865335U (en) * | 2019-04-03 | 2019-12-31 | 无锡化工装备股份有限公司 | Overflow tooth-shaped taper type pipe orifice film distributor |
| CN209984960U (en) * | 2019-04-28 | 2020-01-24 | 江苏纵横浓缩干燥设备有限公司 | Falling film evaporator with high heat energy utilization efficiency |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112274956A (en) * | 2020-10-19 | 2021-01-29 | 扬州大学 | Falling film evaporator and falling film evaporation method thereof |
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Application publication date: 20200925 |