CN106334325A - Efficient phase change plate-type evaporator - Google Patents

Abstract

The invention discloses a high-efficiency phase-change plate evaporator, which comprises a plurality of evaporating heat-exchanging plates, and the evaporating heat-exchanging plates are arranged between a front end plate and a rear end plate, and the front end plate and the rear end plate are connected through pull rods. Connection, the invention has compact structure, small volume, not easy to scale, easy to disassemble and clean and maintain, through the reasonable layout of the plate evaporator pipeline and the optimized design of the flow channel, the steam and concentrated liquid generated by the evaporation and concentration of the solution on the evaporation side are respectively upward and downward. The outlet flows in different directions, and the vapor in the solution is quickly separated and exported, avoiding the condensation of bubbles, reducing the influence of vesicular bubbles on heat transfer, and efficiently realizing boiling heat transfer and vapor-liquid separation; and, making the condensation side The condensate produced by the high-temperature secondary steam condensation phase change is quickly and timely discharged, which reduces the influence of the bridging liquid on heat transfer; thereby greatly improving the evaporation heat transfer efficiency and solving the problem of the existing phase change plate evaporator heat transfer efficiency Not a high question.

Description

A high-efficiency phase-change plate evaporator

Technical field:

The invention relates to the technical field of evaporation and concentration, in particular to a high-efficiency phase-change plate evaporator.

Background technique:

In the evaporation and concentration process in the fields of food, pharmaceuticals and sewage treatment, the tube evaporator is currently the most widely used evaporator. This type of evaporator has the advantages of simple structure and convenient processing, but it also has disadvantages such as low heat transfer efficiency, large volume, easy scaling, and frequent maintenance. In order to overcome the above shortcomings, people have increased the research on phase change plate evaporators.

The structure of the existing ordinary phase change plate evaporator is not much different from the commonly used plate heat exchanger. Only according to the change of the fluid phase change flow rate, the diameter of the inlet and outlet pipes has been adjusted. When it is applied to the evaporation and concentration process, During the flow process, the solution will undergo evaporation and phase change continuously, and a large amount of steam will be generated. The solution and steam will mix and flow together. Since the steam cannot be discharged in time, more and more cystic bubbles will be condensed, which reduces the contact between the solution and the plate. The heat transfer area greatly affects the heat transfer effect of the evaporator. Therefore, the prior art needs to be improved and developed.

Invention content:

The purpose of the present invention is to provide a high-efficiency phase-change plate evaporator, which has compact structure, small volume, is not easy to scale, and is easy to disassemble and clean and maintain. The steam and concentrated liquid produced by evaporation and concentration flow up and down in different directions, and the steam in the solution is quickly separated and exported, avoiding the condensation of bubbles, reducing the influence of cystic bubbles on heat transfer, and realizing boiling transfer efficiently. Heat and vapor-liquid are separated; moreover, the condensate produced by the high-temperature secondary steam condensation phase transition on the condensation side is quickly and timely discharged, reducing the influence of the bridging liquid on heat transfer; thus greatly improving the evaporation heat transfer efficiency and solving the problem of The problem of low heat exchange efficiency of the existing phase change plate evaporator is solved.

The present invention is achieved through the following technical solutions:

A high-efficiency phase-change plate evaporator, including a plurality of evaporative heat exchange plates, the evaporative heat exchange plates are arranged between the front end plate and the rear end plate, the front end plate and the rear end plate are connected by tie rods, the There is a suspension hole in the center of the top of the evaporative heat exchange plate, and a positioning hole in the center of the bottom end. The evaporative heat exchange plate is suspended and connected to the upper guide rail fixedly connected to the upper end of the pillar through the suspension hole, and the lower guide rail fixedly connected to the lower end of the pillar through the positioning hole. connection; the pillar is fixedly connected to the base; the evaporative heat exchange plate is divided into an evaporation side and a condensation side; the evaporation side is the side where the raw liquid to be evaporated absorbs heat and undergoes an evaporation phase change, and the evaporating side is provided with a raw liquid inlet One outlet for concentrated liquid and one outlet for concentrated liquid, and two steam outlets; the inlet for raw liquid and the outlet for concentrated liquid are respectively located on the left and right sides of the bottom of the evaporative heat exchange plate, and the steam outlet is located on the left and right sides of the top of the evaporative heat exchange plate; From bottom to top, the evaporation side is the raw liquid inlet or concentrated liquid outlet, the lower diversion area, the heat transfer area, the upper diversion area, and the steam outlet; the lower diversion area and part of the heat transfer area are separated by the central separation groove into The left and right parts; the original liquid inlet, the lower diversion area, the heat transfer area, the upper diversion area, the steam outlet and the concentrated liquid outlet are connected to form the vapor after the evaporation phase transition of the original liquid and its heat absorption, and the vapor-liquid separation. The circulation channel of the concentrated liquid; the condensation side is the side where the high-temperature secondary steam releases heat and undergoes a condensation phase transition. The condensation side is provided with a secondary steam inlet and a secondary steam outlet. In the center of the top of the heat exchange plate, the secondary steam outlet is located in the center of the bottom of the evaporating heat exchange plate. The diversion area and the outlet of the secondary steam constitute the circulation channel of the high-temperature secondary steam and the low-temperature secondary steam and condensate after condensed phase transition.

The front plate is provided with raw liquid inlet, concentrated liquid outlet, steam outlet, secondary steam inlet and secondary steam outlet.

The rear end plate is respectively provided with a concentrated liquid outlet flange sight glass and a steam outlet flange sight glass at positions corresponding to the concentrated liquid outlet and the steam outlet of the evaporative heat exchange plate.

The beneficial effects of the present invention are as follows:

The invention is compact in structure, small in size, not easy to scale, easy to disassemble, clean and maintain. Through the reasonable layout of the plate evaporator pipeline and the optimized design of the flow channel, the steam and concentrated liquid produced by the evaporation and concentration of the solution on the evaporation side are different from each other up and down. The azimuth outlet flow quickly separates and exports the steam in the solution, avoids the condensation of bubbles, reduces the impact of vesicular bubbles on heat transfer, and at the same time efficiently realizes boiling heat transfer and vapor-liquid separation; The condensate produced by the secondary steam condensation phase change is quickly and timely discharged, which reduces the influence of the bridging liquid on heat transfer; thereby greatly improving the evaporation heat transfer efficiency and solving the low heat transfer efficiency of the existing phase change plate evaporator The problem.

Description of drawings:

Fig. 1 is the front view of plate evaporator of the present invention;

Fig. 2 is the left view of plate evaporator of the present invention;

Fig. 3 is the right view of plate evaporator of the present invention;

Fig. 4 is a front view of the evaporation heat exchange plates of the plate evaporator of the present invention.

Among them, 1. Front end plate, 2. Evaporation heat exchange plate, 3. Rear end plate, 4. Pillar, 5. Upper guide rail, 6. Pull rod, 7. Lower guide rail, 8. Base, 9. Raw solution inlet, 10, Steam outlet, 11, concentrated liquid outlet, 12, secondary steam inlet, 13, secondary steam outlet, 14, steam outlet flange sight glass, 15, concentrated liquid outlet flange sight glass, 16, upper diversion area, 17 , Lower diversion area, 18, heat transfer area, 19, separation groove, 20, suspension hole, 21, positioning hole.

detailed description:

The following is a further description of the present invention, rather than a limitation of the present invention.

A high-efficiency phase-change plate evaporator as shown in Figures 1-4 includes a plurality of evaporative heat exchange plates 2, and the evaporative heat exchange plates 2 are arranged between the front end plate 1 and the rear end plate 3, so that The front end plate 1 and the rear end plate 3 are connected by a tie rod 6, a suspension hole 20 is provided in the center of the top end of the evaporation heat exchange plate 2, and a positioning hole 21 is provided in the center of the bottom end, and the evaporation heat exchange plate 2 is connected with the suspension hole 20 through the suspension hole 20. The upper guide rail 5 fixedly connected to the upper end of the pillar 4 is suspended and connected to the lower guide rail 7 fixedly connected to the lower end of the pillar 4 through the positioning hole 21; the pillar 4 is fixedly connected to the base 8; the evaporation heat exchange plate 2 is divided into evaporation side and the condensation side; the evaporation side is the side where the evaporation phase transition occurs due to the heat absorption of the stock solution to be evaporated, and the evaporation side is provided with a stock solution inlet 9 and a concentrated solution outlet 11, and two steam outlets 10; and the concentrated liquid outlet 11 are respectively arranged on the left and right sides of the bottom of the evaporating heat exchange plate 2, and the steam outlet 10 is arranged on the left and right sides of the top of the evaporating heat exchange plate 2; Liquid outlet 11, lower diversion zone 17, heat transfer zone 18, upper diversion zone 16, steam outlet 10; the lower diversion zone 17 and part of the heat transfer zone 18 are divided into left and right parts by the central separation groove 19; The raw liquid inlet 9, the lower diversion area 17, the heat transfer area 18, the upper diversion area 16, the steam outlet 10, and the concentrated liquid outlet 11 are connected to form a vapor phase transition and vapor-liquid separation of the raw liquid to be evaporated and its heat absorption. The circulation channel of steam and concentrated liquid; the condensation side is the side where the high-temperature secondary steam releases heat and undergoes condensation phase transition, and the condensation side is provided with a secondary steam inlet 12 and a secondary steam outlet 13, and the secondary steam The inlet 12 is set at the center of the top of the evaporating heat exchange plate 2, and the secondary steam outlet 13 is set at the center of the bottom end of the evaporating heat exchange plate 2. The condensation side is connected with the secondary steam inlet 12, the upper The diversion area 16 , the heat transfer area 18 , the lower diversion area 17 , and the secondary steam outlet 13 constitute a circulation channel for the high-temperature secondary steam and the low-temperature secondary steam and condensate after condensed phase transition.

The front plate 1 is provided with a raw liquid inlet 9 , a concentrated liquid outlet 11 , a steam outlet 10 , a secondary steam inlet 12 and a secondary steam outlet 13 .

The rear end plate is respectively provided with a concentrated liquid outlet flange sight glass 15 and a steam outlet flange sight glass 14 at positions corresponding to the concentrated liquid outlet 11 and the steam outlet 10 of the evaporative heat exchange plate 2 .

The specific working process is as follows: the raw liquid to be evaporated and concentrated enters from the raw liquid inlet 9 on the left side of the bottom of the evaporation side, and after being distributed by the left lower diversion area, it evenly enters the left heat transfer area, flows upward to the upper part of the separation tank, and flows to the right Enter the heat transfer area on the right side, and then flow downwards. During the flow process, the solution is continuously heated by the high-temperature secondary steam entering from the secondary steam inlet 12 on the condensation side, and the phase change of evaporation occurs continuously. After converging in the diversion area, it is discharged through the concentrated liquid outlet 11, and most of the evaporated phase-change steam is separated from the solution in the upper part of the heat transfer area 18. After converging in the upper diversion area 16, it passes through the steam on both sides of the top Exit 10 discharges. The high-temperature secondary steam enters from the secondary steam inlet 12 in the center of the top of the condensation side, and after passing through the upper diversion area 16, it enters the heat transfer area 18 evenly to exchange heat with the liquid on the evaporation side, and undergoes a condensation phase change, and then undergoes heat exchange The final low-temperature secondary steam and condensed water are discharged from the secondary steam outlet 13 in the center of the bottom after passing through the lower diversion area 17 and converging.

Claims (3)

1. a kind of efficient phase transformation plate-type evaporator is it is characterised in that include multiple evaporation and heat-exchange plates, described evaporation and heat-exchange plate It is located between front end-plate and end plate, described front end-plate and end plate are connected by pull bar, in described evaporation and heat-exchange plate top Centre is provided with suppending hole, and bottom central authorities are provided with location hole, and evaporation and heat-exchange plate is upper with what pillar upper end was fixedly connected by suppending hole Guide rail hangs and connects, and is connected with the lower guideway that lower rod end is fixedly connected by location hole；Described pillar is fixedly connected on base On；Described evaporation and heat-exchange plate is divided into evaporation side and condensation side；Evaporation side is that stoste heat absorption to be evaporated occurs the one of evaporative phase-change Side, described evaporation side is provided with stoste entrance and each one of concentrated solution outlet, and is provided with two steam (vapor) outlets；Stoste entrance and concentration Liquid outlet is respectively provided at the evaporation and heat-exchange plate bottom left and right sides, and steam (vapor) outlet is located at the evaporation and heat-exchange plate top left and right sides； Described evaporation side is followed successively by stoste entrance or concentrated solution outlet from the bottom to top, lower guiding region, heat transfer zone, upper guiding region, steam go out Mouthful；Described lower guiding region and portion of heat transfer area are divided into left and right two parts by central separation trough；Stoste entrance, lower guiding region, Heat transfer zone, upper guiding region, steam (vapor) outlet are connected with concentrated solution outlet, constitute stoste to be evaporated and its heat absorption occurs evaporation phase Steam after change, vapor-liquid separation, the circulation passage of concentrate；Described condensation side is that high temperature secondary steam heat release occurs condensation phase transformation Side, condensation side be provided with indirect steam entrance, indirect steam export each one, described indirect steam entrance is located at evaporation and heat-exchange Plate top central authorities, indirect steam outlet is located at evaporation and heat-exchange plate bottom central authorities, and described condensation side is from top to bottom followed successively by phase Connection indirect steam entrance, upper guiding region, heat transfer zone, lower guiding region, indirect steam outlet, constitute high temperature secondary steam and There is the circulation passage of the low temperature indirect steam after condensation phase transformation and condensate liquid in it.

2. efficient phase transformation plate-type evaporator according to claim 1 is it is characterised in that described front end-plate is provided with stoste enters Mouth, concentrated solution outlet, steam (vapor) outlet, indirect steam entrance and indirect steam outlet.

3. efficient phase transformation plate-type evaporator according to claim 1 is it is characterised in that described end plate is in evaporation and heat-exchange It is respectively arranged with concentrated solution outlet flange visor, steam (vapor) outlet method at the corresponding position of the concentrated solution outlet of plate, steam (vapor) outlet Blue visor.