CN218210918U - Multistage heat exchange separator - Google Patents

Abstract

The utility model discloses a multi-stage heat exchange separator, which relates to the technical field of separators and comprises a cylinder body, wherein the cylinder body is of a vertical structure, the bottom of the cylinder body is provided with a bottom end socket, a heat exchange separation cavity is arranged in the cylinder body, one side of the cylinder body is provided with a raw material medium inlet connecting pipe, and a raw material medium is conveyed into the heat exchange separation cavity through the raw material medium inlet connecting pipe; a medium distributor and a heat exchange unit are arranged in the heat exchange separation cavity, and a cylinder is externally connected with a vacuum pumping system; the heat exchanger separator of the utility model can realize modular design, reduce the requirement of heat exchange elements on the corrosion resistance of materials while separating raw material media and utilizing waste heat, and has low equipment cost; the distribution of the raw material medium and the residual liquid medium is more uniform; erosion corrosion to the medium distributor is effectively reduced, and blockage of the downcomer by salt and impurities separated out from the medium is reduced; the impurity deposition is reduced; the separation of gas impurities can be realized; high heat transfer efficiency, on-line cleaning and long equipment running period.

Description

Multistage heat exchange separator

Technical Field

The utility model relates to a separator technical field especially relates to a multistage heat transfer separator.

Background

The separator is a process device commonly used in industry, and performs separation aiming at a multi-phase medium, the existing separation technologies generally comprise a three-phase separator, a filtration separator, a cyclone separator and the like, and the separation technology generally adopts evaporative crystallization and other modes to process the homogeneous medium.

Traditional three-phase separator utilizes the density difference principle to separate, generally in occasions wide application such as oil gas field, the medium generally is oil, gas, water three-phase, and complicated to the medium environment, the great occasion of flow, the general volume of equipment is great, and to the medium occasion that contains solid impurity, the solid of isolating needs regularly to carry out artifical clearance.

Traditional filtering separation ware utilizes the adsorptivity and the space size of filter core to filter, only can separate suspended particles and suspension liquid drop, and to the dirty environment of medium, the filter core needs to be changed often, and is with high costs, and influences the long period operation of equipment.

Traditional cyclone separator adopts the hydrocyclone separation principle, can separate oil, water, gas three-phase mixed medium, and to the more occasion of solid medium impurity, the cyclone tube blocks up easily, and life cycle is short, and the persistence is low.

The above-mentioned prior separators have the following technical disadvantages:

the traditional three-phase separator and the filtering separator can not treat the salt-containing wastewater; in addition, the existing separator only has a separation function and cannot recycle the waste heat of the raw material medium; for homogeneous media such as high-salt water and the like, density difference or gravity cannot be adopted for separation, and separation is generally carried out by adopting modes such as dividing wall type heat exchange evaporative crystallization and the like, but solid, salt and the like are easily separated out in the heat exchange process, so that equipment is easily blocked and fails, and the evaporation and the separator are generally arranged separately, so that more connecting pipelines are provided, and the occupied area is larger; the present invention therefore proposes a multistage heat exchanger separator.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects in the prior art and providing a multi-stage heat exchange separator.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a multi-stage heat exchange separator comprises a cylinder body, wherein the cylinder body is of a vertical structure, a bottom end socket is arranged at the bottom of the cylinder body, a heat exchange separation cavity is arranged in the cylinder body, a raw material medium inlet connecting pipe is arranged on one side of the cylinder body, and a raw material medium is conveyed into the heat exchange separation cavity through the raw material medium inlet connecting pipe;

the heat exchange separation cavity is internally provided with a medium distributor and a heat exchange unit, the cylinder is externally connected with a vacuumizing system, after entering the heat exchange separation cavity, a raw material medium is stabilized and guided by the medium distributor, the vacuumizing system is used for reducing the pressure inside the heat exchange separation cavity to vaporize the raw material medium, the raw material medium is vaporized to form a steam medium, the steam medium enters the heat exchange unit, one side of the cylinder is provided with a cold medium inlet pipe, the cold medium is conveyed to the heat exchange unit through the cold medium inlet pipe, the heat exchange unit is also provided with a cold medium outlet pipe, and the steam medium and the cold medium realize heat exchange through the heat exchange unit to form a condensed water medium;

a first drain pipe is arranged at the bottom of the bottom end enclosure, and residual liquid medium after the raw material medium is vaporized is discharged through the first drain pipe;

and a second drain pipe is arranged on one side of the barrel, and condensed water medium is discharged through the second drain pipe.

Further, a plurality of heat exchange separation cavities are vertically arranged in the barrel body, two adjacent heat exchange separation cavities are communicated with each other from top to bottom, the heat exchange units in the two adjacent heat exchange separation cavities are communicated with each other through series pipes, cold media are sequentially input into each heat exchange unit from bottom to top through cold medium inlet pipes, and are finally output from cold medium outlet pipes.

Furthermore, the medium distributor comprises a bottom plate fixed with the inner wall of the cylinder, a medium buffer area, a medium distribution area and a down-flow area are arranged on the bottom plate, the medium distribution area is positioned between the medium buffer area and the down-flow area, and the medium buffer area are inclined towards the down-flow area;

the medium distribution area is provided with a plurality of flow deflectors which are arranged at intervals and fixed on the top surface of the bottom plate, the down-flow area is provided with down-flow pipes fixed on the lower side of the bottom plate, the two adjacent heat exchange separation cavities are communicated with each other up and down through the down-flow pipes, and the bottom ends of the down-flow pipes located on the lowest side are connected with the first drainage pipe.

Furthermore, the bottom end of the downcomer is provided with a reducer, the reducer and the vertical direction form an included angle of 45 degrees, and the outlet at the bottom of the reducer is a notch of 30 degrees.

Furthermore, the heat exchange unit comprises a shell, a first heat exchange element and a second heat exchange element are arranged in the shell, the first heat exchange element and the second heat exchange element are arranged in parallel up and down, one ends of the first heat exchange element and the second heat exchange element which are positioned on the same side are mutually communicated through a U-shaped rotary cavity, a cold medium outlet connecting pipe is arranged on one side of the first heat exchange element, which is far away from the U-shaped rotary cavity, a cold medium inlet connecting pipe is arranged on one side of the second heat exchange element, which is far away from the U-shaped rotary cavity, and cold medium flows into the second heat exchange element from the cold medium inlet connecting pipe and then flows into the first heat exchange element from the U-shaped rotary cavity;

the top of the shell is provided with a steam distributor, a steam medium sequentially flows through the first heat exchange element and the second heat exchange element through the steam distributor, in the process, the steam medium and a cold medium realize heat exchange through the first heat exchange element and the second heat exchange element, and the steam medium forms a condensed water medium after heat exchange;

the bottom of the shell is provided with a vacuumizing port connecting pipe and a condensed water outlet connecting pipe, the vacuumizing port connecting pipe is connected with a vacuumizing system through a vacuumizing pipe, and when the vacuumizing system runs, the pressure intensity in the shell and the heat exchange separation cavity can be reduced, so that a raw material medium can be vaporized into a steam medium, and simultaneously non-condensable gas can be pumped out;

and the condensed water medium is connected with the second drain pipe through the condensed water outlet connecting pipe and finally discharged out of the barrel.

Furthermore, a flushing nozzle is arranged at a position corresponding to each heat exchange separation cavity in the cylinder body, the flushing nozzle is connected with a cold medium outlet pipe through a flushing pipe, a first valve is mounted on the flushing pipe, and when the first valve is opened, cold medium can be sprayed out of the flushing nozzle and used for cleaning the inside of the cylinder body;

the bottom of casing still is equipped with the drain takeover, and the drain takeover is connected with drain pipe two equally, installs the second valve on the drain takeover, installs the third valve on the comdenstion water export takeover, and the cold medium of washing terminals spun washes the inside and heat exchange element one and heat exchange element two of casing, and when the second valve was opened, sewage discharge, and when the third valve was opened, the comdenstion water medium can discharge drain pipe two.

Furthermore, an overhaul manhole is arranged at the position of the cylinder body corresponding to each heat exchange separation cavity;

the top of the cylinder body is also provided with an exhaust port;

and the bottom of the bottom end socket is also provided with an equipment leakage signal port.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model discloses a heat transfer separator is the vertical multistage heat transfer splitter with a plurality of heat transfer separation chambeies and heat transfer unit integration together, separates through medium distributor, ball-cock assembly between each heat transfer separation chamber, can realize integral type modularized design, reduces the connecting tube between different units, and compact structure nature is high.

2. After the raw material medium in the heat exchange separation cavity enters, the raw material medium is vaporized due to the pressure reduction in the heat exchange separation cavity, the generated steam medium enters the heat exchange unit for condensation, the residual liquid medium after vaporization enters the next-stage heat exchange separation cavity through the downcomer, the raw material medium can be prevented from being in direct contact with the heat exchange unit, the raw material medium can be separated and the waste heat can be utilized, meanwhile, the raw material medium and the residual liquid medium are prevented from corroding heat exchange elements, the requirement of the heat exchange elements on the corrosion resistance of materials is lowered, the cost of heat exchange equipment is lowered, and the long-acting property is improved.

3. The medium distributor consists of a medium buffer area, a medium distribution area and a liquid descending area, wherein the medium distribution area is provided with a flow deflector, the liquid descending area is provided with a liquid descending pipe, and a bottom plate of the medium distributor slopes to the liquid descending pipe, so that the raw material medium and the residual liquid medium are distributed more uniformly.

4. The bottom of the downcomer of the medium distributor is provided with a large head and a small head, the large head and the small head form an included angle of 45 degrees with the vertical direction, and an outlet is a notch of 30 degrees, so that the erosion corrosion of residual liquid to a next-stage medium distribution plate can be effectively reduced, and the blockage of the downcomer caused by salt and impurities separated out from a raw material medium and the residual liquid medium is reduced.

5. The guide vanes of the medium distributor adopt a slope design, so that the retention time of the raw material medium on the medium distributor can be increased, the turbulence of the medium can be improved, and the deposition of salt and impurities in the medium can be reduced.

6. A vacuumizing system is externally connected with the heat exchange unit, so that decompression in the heat exchange separation cavity is realized, the raw material medium is vaporized, and meanwhile, separated non-condensable gas (gas which is contained in the steam medium and can not be condensed into liquid) is pumped out, so that separation of gas impurities can be realized.

8. The connecting pipes of the upper and lower heat exchange units of the separator are arranged at the same side, so that the field equipment is convenient to arrange.

9. A flushing pipe is arranged at a cold medium outlet pipe of the heat exchange separation cavity, and a flushing nozzle located in the heat exchange separation cavity is installed on the flushing pipe, so that the inside of the barrel can be cleaned on line, and the running period of equipment is longer.

To sum up, the heat exchanger separator of the utility model can realize modular design, separation of raw material medium and waste heat utilization, and simultaneously can reduce the requirement of heat exchange elements on material corrosion resistance and reduce equipment cost; the distribution of the raw material medium and the residual liquid medium is more uniform; the erosion corrosion of the residual liquid medium at the upper stage to the medium distributor at the lower stage can be effectively reduced, and simultaneously, the blockage of the downcomer by the salt and impurities separated out from the raw material medium and the residual liquid medium is reduced; impurity deposition is reduced; the separation of gas impurities can be realized; the heat transfer efficiency is high, and the volume of the heat exchange unit is small; the field equipment is convenient to arrange; the device can be cleaned on line, and the running period of the device is long.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a side view of the structure of the medium distributor according to the present invention;

FIG. 3 is a schematic top view of a baffle plate on a base plate in a media distributor;

fig. 4 is a schematic structural diagram of the middle heat exchange unit of the present invention.

In the figure: 1, a cylinder body, 2 heat exchange separation chambers, 3, a raw material medium inlet connecting pipe, 4 medium distributors, 5 heat exchange units, 6 cold medium inlet pipes, 7 cold medium outlet pipes, 8 vacuum pipes, 9 vacuum pumping systems, 10 inspection manholes, 11 serial pipes, 12 ball float valves, 13 flushing nozzles, 14 exhaust ports, 15 equipment leakage signal ports, 16 base end enclosures, 17 drain pipes I, 18 drain pipes II, 19 condensed water connecting pipes and 20 drain outlet connecting pipes;

101 raw material medium, 102 cold medium, 103 steam medium, 104 condensed water medium and 105 residual liquid medium;

40 bottom plates, 41 flow deflectors, 42 down-flow areas, 43 down-flow pipes, 44 medium distribution areas, 45 medium buffer areas and 46 large and small ends;

50 shells, 51 heat exchange elements I, 52 heat exchange elements II, 53 steam distributors, 54U-shaped rotary cavities, 55 cold medium outlet connecting pipes, 56 cold medium inlet connecting pipes, 57 vacuum-pumping port connecting pipes, 58 sewage draining port connecting pipes and 59 condensed water outlet connecting pipes.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention;

referring to fig. 1-4, a multi-stage heat exchange separator comprises a cylinder 1, wherein the cylinder 1 is of a vertical structure, a bottom end enclosure 16 is arranged at the bottom of the cylinder 1, a heat exchange separation chamber 2 is arranged in the cylinder 1, a raw material medium inlet connecting pipe 3 is arranged at one side of the cylinder 1, and a raw material medium 101 is conveyed into the heat exchange separation chamber 2 through the raw material medium inlet connecting pipe 3;

a medium distributor 4 and a heat exchange unit 5 are arranged in the heat exchange separation cavity 2, a barrel 1 is externally connected with a vacuumizing system 9, after a raw material medium 101 (high-salt wastewater in the utility model) enters the heat exchange separation cavity 2, a steady flow and a flow guide are realized through the medium distributor 4, the vacuumizing system 9 is used for reducing the pressure in the heat exchange separation cavity 2, so that the raw material medium 101 is vaporized, the raw material medium 101 is vaporized to form a steam medium 103, the steam medium 103 enters the heat exchange unit 5, a cold medium inlet pipe 6 is arranged on one side of the barrel 1, the cold medium 102 is conveyed to the heat exchange unit 5 through the cold medium inlet pipe 6, the heat exchange unit 5 is also provided with a cold medium outlet pipe 7, the steam medium 103 and the cold medium 102 realize heat exchange through the heat exchange unit 5, and a condensed water medium 104 is formed;

a first drain pipe 17 is arranged at the bottom of the bottom end enclosure 16, and residual liquid medium 105 left after the raw material medium 101 is vaporized is discharged through the first drain pipe 17;

one side of the cylinder 1 is provided with a second drain pipe 18, and the condensed water medium 104 is discharged through the second drain pipe 18.

Vertically in the barrel 1 be equipped with a plurality of heat transfer separation chambeies 2, as shown in fig. 1, barrel 1 inside is equipped with three heat transfer separation chamber 2 in this embodiment, two adjacent heat transfer separation chambeies 2 communicate each other from top to bottom, communicate each other through series connection pipe 11 between the heat transfer unit 5 in two adjacent heat transfer separation chambeies 2, each heat transfer unit 5 is inputed from supreme in proper order down to cold medium 102 through cold medium inlet tube 6, export from cold medium outlet pipe 7 at last, steam medium 103 and cold medium 102 realize the heat transfer through heat transfer unit 5 in this in-process, form condensed water medium 104, and make wherein salt impurity of separating out.

As shown in fig. 2, the medium distributor 4 includes a bottom plate 40 fixed to the inner wall of the cylinder 1, the bottom plate 40 is provided with a medium buffer area 45, a medium distribution area 44 and a down-flow area 42, the medium distribution area 44 is located between the medium buffer area 45 and the down-flow area 42, and the medium buffer area 45 are both inclined toward the down-flow area 42;

the medium distribution area 44 is provided with a plurality of guide vanes 41 which are arranged at intervals and fixed on the top surface of the bottom plate 40, the down-flow area 42 is provided with a down-flow pipe 43 fixed on the lower side of the bottom plate 40, the two adjacent heat exchange separation cavities 2 are communicated with each other up and down through the down-flow pipe 43, and the bottom end of the down-flow pipe 43 positioned on the lowest side is connected with the first drainage pipe 17.

As shown in FIG. 2, the large and small heads 46 are arranged at the bottom end of the downcomer 43, the included angle between the large and small heads 46 and the vertical direction is 45 degrees, and the outlet at the bottom of the large and small heads 46 is a 30-degree notch.

The structural design of the reducer 46 can effectively reduce the erosion of the residual liquid medium 105 to the next-stage medium distributor 4, and simultaneously prevent the salt analysis in the residual liquid medium 105 and the blockage of impurities at the outlet.

As shown in fig. 3, the flow deflector 41 is designed in a slope direction, so as to increase the residence time of the raw material medium 101 and the residual liquid medium 105 on the distribution plate, and simultaneously increase the turbulence of the medium, thereby preventing the deposition of salt and impurities in the medium.

The heat exchange unit 5 comprises a shell 50, a first heat exchange element 51 and a second heat exchange element 52 are arranged inside the shell 50, and the first heat exchange element 51 and the second heat exchange element 52 adopt plate type heat exchange elements in the prior art, namely plate type heat exchangers.

The first heat exchange element 51 and the second heat exchange element 52 are arranged in parallel up and down, one ends of the first heat exchange element 51 and the second heat exchange element 52 on the same side are communicated with each other through a U-shaped rotary cavity 54, a cold medium outlet connecting pipe 55 is arranged on one side, away from the U-shaped rotary cavity 54, of the first heat exchange element 51, a cold medium inlet connecting pipe 56 is arranged on one side, away from the U-shaped rotary cavity 54, of the second heat exchange element 52, and cold medium 102 flows into the second heat exchange element 52 from the cold medium inlet connecting pipe 56 and then flows into the first heat exchange element 51 from the U-shaped rotary cavity 54;

the top of the shell 50 is provided with a steam distributor 53, the steam medium 103 sequentially flows through the first heat exchange element 51 and the second heat exchange element 52 through the steam distributor 53, in the process, the steam medium 103 and the cold medium 102 realize heat exchange through the first heat exchange element 51 and the second heat exchange element 52, and the steam medium 103 forms a condensed water medium 104 after heat exchange;

a vacuumizing port connecting pipe 57 and a condensed water outlet connecting pipe 59 are arranged at the bottom of the shell 50, the vacuumizing port connecting pipe 57 is connected with a vacuumizing system 9 through a vacuumizing pipe 8, and when the vacuumizing system 9 operates, the pressure in the shell 50 and the heat exchange separation cavity 2 can be reduced, so that the raw material medium 101 can be vaporized into a steam medium 103, and non-condensable gas (gas which is contained in the steam medium 103 and can not be condensed into liquid) can be pumped out;

the condensate water medium 104 is connected with the second drain pipe 18 through the condensate water outlet connecting pipe 59, and finally discharged out of the cylinder 1, wherein the condensate water outlet connecting pipe 59 extends 200mm deep into the end enclosure.

After the raw material medium 101 in the heat exchange separation cavity 2 enters, the raw material medium is vaporized due to the pressure reduction in the heat exchange separation cavity 2, the generated steam medium 103 enters the heat exchange unit 5 for condensation, the residual liquid medium 105 after vaporization enters the next-stage heat exchange separation cavity 2 through the downcomer 43, the raw material medium 101 can be prevented from directly contacting with the first heat exchange element 51 and the second heat exchange element 52 in the heat exchange unit 5, the separation and waste heat utilization of the raw material medium 101 can be realized, meanwhile, the corrosion of the raw material medium 101 and the residual liquid medium 105 to the first heat exchange element 51 and the second heat exchange element 52 is avoided, the requirement of the first heat exchange element 51 and the second heat exchange element 52 on the corrosion resistance of materials is reduced, the cost of heat exchange equipment is reduced, and the long-term effect is improved.

In addition, a flushing nozzle 13 is arranged at the position corresponding to each heat exchange separation cavity 2 in the cylinder body 1, the flushing nozzle 13 is connected with the cold medium outlet pipe 7 through a flushing pipe, a first valve is mounted on the flushing pipe, and when the first valve is opened, the cold medium 102 can be sprayed out from the flushing nozzle 13 and used for cleaning the inside of the cylinder body 1;

the bottom of the shell 50 is also provided with a drain connecting pipe 58, the drain connecting pipe 58 is also connected with the second drain pipe 18, a second valve is installed on the drain connecting pipe 58, a third valve is installed on the condensed water outlet connecting pipe 59, the cold medium 102 sprayed by the washing nozzle 13 washes the inside of the shell 50, the first heat exchange element 51 and the second heat exchange element 52, when the second valve is opened, sewage is discharged, and when the third valve is opened, the condensed water medium 104 can be discharged out of the second drain pipe 18.

In addition, the positions of the cylinder body 1 corresponding to each heat exchange separation cavity 2 are provided with an inspection manhole 10; the inspection manhole 10 is convenient for personnel to inspect the interior of the cylinder body 1;

the top of the cylinder body 1 is also provided with an exhaust port 14; the exhaust port 14 is used for exhausting gas inside the cylinder 1; or a pressure sensor is arranged to detect the air pressure inside the cylinder 1.

The bottom of the bottom end enclosure 16 is also provided with an equipment leakage signal port 15 for installing a liquid sensor, so as to detect whether the barrel 1 has a leakage condition.

A ball float valve 12 is provided at the downcomer 42 for closing the top of the downcomer 43 at the downcomer 42, thereby separating the upper and lower adjacent heat exchange separation chambers 2.

Claims (7)

1. A multi-stage heat exchange separator comprises a cylinder body (1), and is characterized in that the cylinder body (1) is of a vertical structure, a bottom end socket (16) is arranged at the bottom of the cylinder body (1), a heat exchange separation cavity (2) is arranged in the cylinder body (1), a raw material medium inlet connecting pipe (3) is arranged on one side of the cylinder body (1), and a raw material medium (101) is conveyed into the heat exchange separation cavity (2) through the raw material medium inlet connecting pipe (3);

a medium distributor (4) and a heat exchange unit (5) are arranged in the heat exchange separation cavity (2), the cylinder body (1) is externally connected with a vacuumizing system (9), after the raw material medium (101) enters the heat exchange separation cavity (2), the flow stabilization and the flow guide are realized through the medium distributor (4), the vacuumizing system (9) is used for reducing the pressure in the heat exchange separation cavity (2) so that the raw material medium (101) is vaporized, the raw material medium (101) is vaporized to form a steam medium (103), the steam medium (103) enters the heat exchange unit (5), one side of the cylinder body (1) is provided with a cold medium inlet pipe (6), the cold medium (102) is conveyed to the heat exchange unit (5) through the cold medium inlet pipe (6), the heat exchange unit (5) is further provided with a cold medium outlet pipe (7), and the heat exchange between the steam medium (103) and the cold medium (102) is realized through the heat exchange unit (5) to form a condensed water medium (104);

a first drain pipe (17) is arranged at the bottom of the bottom end enclosure (16), and residual liquid medium (105) left after the raw material medium (101) is vaporized is discharged through the first drain pipe (17);

and a second drain pipe (18) is arranged on one side of the barrel (1), and the condensed water medium (104) is discharged through the second drain pipe (18).

2. The multistage heat exchange separator as claimed in claim 1, wherein a plurality of heat exchange separation chambers (2) are vertically arranged in the barrel (1), two adjacent heat exchange separation chambers (2) are communicated with each other from top to bottom, the heat exchange units (5) in two adjacent heat exchange separation chambers (2) are communicated with each other through a series pipe (11), a cold medium (102) is sequentially input into each heat exchange unit (5) from bottom to top through a cold medium inlet pipe (6), and is finally output from a cold medium outlet pipe (7), and in the process, the steam medium (103) and the cold medium (102) exchange heat through the heat exchange units (5) to form a condensed water medium (104) and separate out salt impurities in the condensed water medium (104).

3. The multistage heat exchange separator according to claim 2, wherein the medium distributor (4) comprises a bottom plate (40) fixed with the inner wall of the cylinder body (1), a medium buffer area (45), a medium distribution area (44) and a down-flow area (42) are arranged on the bottom plate (40), the medium distribution area (44) is positioned between the medium buffer area (45) and the down-flow area (42), and the medium buffer area (45) are inclined to the down-flow area (42);

the medium distribution area (44) is provided with a plurality of guide vanes (41) which are arranged at intervals and fixed on the top surface of the bottom plate (40), the down-flow area (42) is provided with down-flow pipes (43) fixed on the lower side of the bottom plate (40), two adjacent heat exchange separation cavities (2) are communicated with each other up and down through the down-flow pipes (43), and the bottom ends of the down-flow pipes (43) positioned on the lowest side are connected with the first drainage pipe (17).

4. The multistage heat exchange separator according to claim 3, wherein the bottom end of the downcomer (43) is provided with a reducer (46), the reducer (46) forms an angle of 45 degrees with the vertical direction, and the outlet at the bottom of the reducer (46) is a notch of 30 degrees.

5. The multistage heat exchange separator as recited in claim 3, wherein the heat exchange unit (5) comprises a shell (50), a first heat exchange element (51) and a second heat exchange element (52) are arranged inside the shell (50), the first heat exchange element (51) and the second heat exchange element (52) are arranged in parallel up and down, and one ends of the first heat exchange element (51) and the second heat exchange element (52) which are positioned at the same side are communicated with each other through a U-shaped rotary cavity (54), a cold medium outlet connecting pipe (55) is arranged at one side of the first heat exchange element (51) which is far away from the U-shaped rotary cavity (54), a cold medium inlet connecting pipe (56) is arranged at one side of the second heat exchange element (52) which is far away from the U-shaped rotary cavity (54), and cold medium (102) flows into the second heat exchange element (52) from the cold medium inlet connecting pipe (56) and then flows into the first heat exchange element (51) from the U-shaped rotary cavity (54);

the top of the shell (50) is provided with a steam distributor (53), a steam medium (103) sequentially flows through a first heat exchange element (51) and a second heat exchange element (52) through the steam distributor (53), in the process, the steam medium (103) and a cold medium (102) realize heat exchange through the first heat exchange element (51) and the second heat exchange element (52), and the steam medium (103) forms a condensed water medium (104) after heat exchange;

a vacuumizing port connecting pipe (57) and a condensate water outlet connecting pipe (59) are arranged at the bottom of the shell (50), the vacuumizing port connecting pipe (57) is connected with a vacuumizing system (9) through a vacuumizing pipe (8), and when the vacuumizing system (9) operates, the pressure in the shell (50) and the heat exchange separation cavity (2) can be reduced, so that the raw material medium (101) can be vaporized into a steam medium (103), and meanwhile, non-condensable gas can be pumped out;

the condensed water medium (104) is connected with the second drain pipe (18) through the condensed water outlet connecting pipe (59) and finally discharged out of the barrel (1).

6. The multi-stage heat exchange separator as claimed in claim 5, wherein a washing nozzle (13) is arranged in the cylinder (1) at a position corresponding to each heat exchange separation chamber (2), the washing nozzle (13) is connected with the cold medium outlet pipe (7) through a washing pipe, a first valve is arranged on the washing pipe, and when the first valve is opened, the cold medium (102) can be sprayed out from the washing nozzle (13) for cleaning the inside of the cylinder (1);

the bottom of casing (50) still is equipped with drain takeover (58), and drain takeover (58) are connected with drain pipe two (18) equally, install the second valve on drain takeover (58), install the third valve on condensate outlet takeover (59), cold medium (102) of washing terminals (13) spun wash casing (50) inside and heat exchange element one (51) and heat exchange element two (52), when the second valve is opened, discharge sewage, when the third valve is opened, drain pipe two (18) can be discharged to condensate water medium (104).

7. The multistage heat exchange separator as claimed in claim 1, wherein a manhole (10) is arranged at the position of the cylinder (1) corresponding to each heat exchange separation chamber (2), an exhaust port (14) is further arranged at the top of the cylinder (1), and an equipment leakage signal port (15) is further arranged at the bottom of the bottom end socket (16).

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