CN204219809U - Dispensing orifice is provided with the falling film evaporation device of necking segment - Google Patents

Abstract

The utility model relates to the field of evaporating and concentrating feed liquid, and aims to provide a falling film evaporating device in which a distribution hole is provided with a necking section. A falling film evaporator with a distribution hole provided with a necking section, including a falling film evaporator and a steam condenser; the falling film evaporator includes a shell with a lower partition, an evaporation chamber, several heat exchange tubes, and a shell The distributor connected to the upper part of the body; the distributor and the lower partition divide the shell into an upper chamber, a middle chamber and a lower chamber; the lower end of the heat exchange tube is inserted into the lower partition and communicated with the lower chamber; the distributor has a number of The number of distribution holes is the same as that of the heat exchange tubes; the distribution holes include two main sections, a necking section, and two transition sections; the upper end of each heat exchange tube communicates with a main section; the shell is provided with a The feed liquid inlet hole, the heating medium inlet and the condensed water outlet connected with the middle cavity, and the gas-liquid mixing outlet connected with the lower cavity; the evaporation chamber is equipped with a gas-liquid mixing inlet hole, a steam outlet hole and a liquid phase outlet hole. The falling film evaporator with the necking section in the distribution hole can take into account the film forming effect and uniformity and the falling speed of the material liquid flowing along the inner side of the heat exchange tube in film form.

Description

Falling film evaporation device with necking section in distribution hole

technical field

The utility model relates to the field of evaporation and concentration of feed liquid, in particular to a falling film evaporation device in which a distribution hole is provided with a constriction section.

Background technique

The falling film evaporator with a necking section in the distribution hole includes a falling film evaporator and a vapor condenser; the utility model of Chinese patent application number: 201410015375.5 discloses a falling film evaporator, including an outer shell and a vertically arranged on the outer shell The upper partition, the lower partition and the heat exchange tube inside the body, the upper partition and the lower partition divide the inner cavity of the outer shell into the first cavity, the second cavity and the third cavity, the first cavity and the second cavity The cavity is located on both sides of the upper partition, the second cavity and the third cavity are located on both sides of the lower partition, one end of the heat exchange tube is inserted into the upper partition and communicated with the first cavity, and the other end of the heat exchange tube is inserted into the Installed on the lower partition and communicated with the third chamber, the first chamber is provided with a feed port, the third chamber is provided with a discharge pipe, the falling film evaporator also includes an evaporation chamber, and the outlet of the discharge pipe is located at In the evaporation chamber, a jet pump is arranged on the upper part of the evaporation chamber, and a discharge port is arranged on the lower part of the evaporation chamber. The falling film evaporator is a partitioned heat exchange equipment used for the evaporation and concentration of the feed liquid; the feed liquid flows into the heat exchange tube from the feed port through the first chamber, and the feed liquid forms a film and flows along the inside of the heat exchange tube under the action of gravity Descending, the heating medium entering the second chamber heats the outside of the heat exchange tube, the moisture in the feed liquid in the heat exchange tube is heated and vaporized, and the generated steam and liquid phase enter the evaporation chamber together for vapor-liquid separation, and the liquid phase is discharged from the discharge port , the steam enters the steam condenser to condense; when the heat exchange tube is thicker, the feed liquid forms a film and flows along the inner side of the heat exchange tube at a faster descending speed, but the film forming effect and uniformity are poor; when the heat exchange tube is thinner, the film forming effect and The uniformity is good, but the material liquid forms a film and flows along the inner side of the heat exchange tube at a slower rate; in order to overcome the traditional falling film evaporation device, there is a film forming effect and uniformity and the material liquid forms a film and flows down along the inner side of the heat exchange tube The speed cannot be taken into account; therefore, it is urgent to design a falling film evaporation device with a distribution hole and a necking section that can take into account the film-forming effect and uniformity and the film-forming flow of the material liquid along the inner side of the heat exchange tube. The problem.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the film-forming effect and uniformity of the current falling-film evaporator and the inability to take into account the falling speed of the material liquid forming a film along the inner side of the heat exchange tube, and to provide a film-forming effect and uniformity and The feed liquid forms a film and flows along the inner side of the heat exchange tube. The distribution hole can take into account the falling speed and is equipped with a falling film evaporation device with a necking section.

Concrete technical scheme of the present utility model is:

A falling film evaporator with a distribution hole provided with a necking section, including a falling film evaporator and a steam condenser; the falling film evaporator includes a shell with a lower partition, an evaporation chamber, several heat exchange tubes, and a shell The distributor connected to the upper part of the body; the distributor and the lower partition divide the shell into an upper chamber, a middle chamber and a lower chamber; the lower end of the heat exchange tube is inserted into the lower partition and communicated with the lower chamber; the distributor has a number of The number of distribution holes is the same as that of the heat exchange tubes; the distribution holes include two main sections with the same diameter as the inner diameter of the heat exchange tubes, and a necking section with a diameter smaller than the diameter of the main section, and the two ends are respectively connected to one end of the necking section and a main section. The transition section connected to one end of the section; the upper end of the heat exchange tube is connected to the distributor and the upper end of each heat exchange tube is connected to a main section; the shell is provided with a feed liquid inlet hole connected to the upper cavity, and a Heating medium inlet and condensed water outlet, gas-liquid mixing outlet connected to the lower chamber; the evaporation chamber is provided with a gas-liquid mixing inlet connected to the gas-liquid mixing outlet, a steam outlet hole at the top and a liquid phase outlet hole at the bottom. When using the falling film evaporation device with the necking section in the distribution hole, the steam enters the middle cavity from the heating medium inlet to heat the outside of the heat exchange tube; the feed liquid enters the upper cavity from the feed liquid inlet hole, and is distributed into the heat exchange tube through the distribution hole It is heated and forms a film under the action of gravity to flow down along the inside of the heat exchange tube. The moisture in the feed liquid in the heat exchange tube is heated and vaporized, and the generated steam and liquid phase enter the evaporation chamber through the gas-liquid mixing outlet for vapor-liquid separation. The phase is discharged from the liquid phase outlet hole, and the steam is discharged from the steam outlet hole into the steam condenser for condensation; the distribution hole of the distributor of the falling film evaporator of the falling film evaporator with the necking section is provided with the distribution hole that is conducive to film formation. The necking section, the main section has the same inner diameter as the heat exchange tube, which can take into account the film forming effect and uniformity and the falling speed of the material liquid flowing along the inner side of the heat exchange tube in a film shape.

Preferably, the steam condenser includes a condensation chamber, a circulating water tank located below the condensation chamber, a jet pump, and a multistage centrifugal pump; the condensation chamber includes a drum-shaped side wall provided with a condensation inlet and a water cavity The water inlet tray connected with the upper end of the side wall; the upper end surface of the water inlet tray is provided with a water inlet hole connected with the water chamber; the lower end surface of the water inlet tray is provided with a water outlet hole group connected with the water chamber; the multi-stage centrifugal pump They are respectively connected to the water inlet hole and the circulating water tank; the jet pump is respectively connected to the steam outlet hole and the condensation inlet. The steam discharged from the steam outlet hole enters the side wall through the condensing inlet under the action of the jet pump; under the action of the multi-stage centrifugal pump, the cooling water in the circulating water tank enters the side wall from the water outlet hole group through the water inlet hole and the water cavity The steam is condensed in the middle; the structure of the steam condenser is simple, the cooling effect is good, and the cooling water is recycled to save water.

Preferably, a balance valve is provided between the upper chamber and the steam outlet hole. The relative balance of pressure in the upper chamber and the evaporation chamber can be adjusted through the balance valve, which is beneficial for the material liquid to flow and descend in the form of a film along the inner side of the heat exchange tube under the action of gravity.

As a preference, the falling film evaporation device with the necking section in the distribution hole also includes a feed pump, a stop valve, and a discharge pump; the feed pump is connected to the feed liquid inlet hole through the stop valve; the discharge pump is connected to the liquid phase Outlet hole connection. The feed pump facilitates the feed liquid to enter the upper chamber, and the stop valve is used to control the flow of the feed liquid into the upper chamber; the discharge pump facilitates the liquid phase to be discharged from the liquid phase outlet hole.

Compared with the prior art, the utility model has the beneficial effects that: the distribution hole of the distributor of the falling film evaporator of the falling film evaporator with the necking section is provided with a necking section which is beneficial to film formation, and the main section It is the same as the inner diameter of the heat exchange tube, which can take into account the film-forming effect and uniformity and the falling speed of the material liquid flowing along the inner side of the heat exchange tube in a film-like manner. The structure of the steam condenser is simple, the cooling effect is good, and the cooling water is recycled to save water. The relative balance of pressure in the upper chamber and the evaporation chamber can be adjusted through the balance valve, which is beneficial for the material liquid to flow and descend in the form of a film along the inner side of the heat exchange tube under the action of gravity. The steam is discharged from the steam outlet hole and enters the middle cavity under the action of the compressor for waste heat utilization. The feed pump facilitates the feed liquid to enter the upper chamber, and the stop valve is used to control the flow of the feed liquid into the upper chamber; the discharge pump facilitates the liquid phase to be discharged from the liquid phase outlet hole.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model;

Figure 2 is an enlarged view of the dispenser of Figure 1 .

In the figure: lower partition-1, shell-2, feed liquid inlet hole-21, heating medium inlet-22, condensed water outlet-23, gas-liquid mixing outlet-24, evaporation chamber-3, gas-liquid mixing inlet hole -31, steam outlet hole-32, liquid phase outlet hole-33, heat exchange tube-4, distributor-5, distribution hole-51, main section-52, necking section-53, transition section-54, feed Pump-6, globe valve-7, discharge pump-8, upper chamber-9, middle chamber-10, lower chamber-11, balance valve-12, condensation chamber-13, condensation inlet-131, side walls-132 , water cavity-133, water inlet tray-134, water inlet hole-135, water outlet hole group-136, circulating water tank-14, jet pump-15, multistage centrifugal pump-16.

Detailed ways

Below in conjunction with shown in the accompanying drawings the utility model is further described.

As shown in Figure 1 and Figure 2: a falling film evaporation device with a necking section in the distribution hole, including a falling film evaporator and a steam condenser; the falling film evaporator includes a shell with a lower partition 1 2. Evaporation chamber 3, ten heat exchange tubes 4, distributor 5 connected to the upper part of shell 2, feed pump 6, stop valve 7, discharge pump 8; ten heat exchange tubes 4 are evenly distributed along the circumference; The housing 2 is divided into an upper chamber 9, a middle chamber 10 and a lower chamber 11 by the device 5 and the lower partition 1; the lower end of the heat exchange tube 4 is inserted into the lower partition 1 and communicated with the lower chamber 11; the distributor 5 is provided Ten distribution holes 51 with the same number as the heat exchange tubes 4; the distribution holes 51 include two main sections 52 with the same diameter as the inner diameter of the heat exchange tubes 4, and a necking section 53 with a diameter smaller than the diameter of the main section 52, two A transition section 54 whose two ends are respectively connected to one end of the necking section 53 and one end of a main section 52; the shape of the transition section 54 is a truncated cone. The upper end of the heat exchange tube 4 is welded to the lower end of the distributor 5 and the upper end of each heat exchange tube 4 communicates with a main section 52; The connected heating medium inlet 22 and the condensed water outlet 23, the gas-liquid mixing outlet 24 communicating with the lower chamber 11; 32 and the liquid phase outlet hole 33 at the bottom; the vapor outlet hole 32 is connected with the steam condenser.

In the present embodiment, the steam condenser includes a condensation chamber 13, a circulating water tank 14 located below the condensation chamber 13, a jet pump 15, and a multistage centrifugal pump 16; the condensation chamber 13 includes a condensing inlet 131 and a drum shape The side wall 132 and the water inlet tray 134 that is provided with a water cavity 133 and welded with the upper end of the side wall 132; The lower end surface is provided with a water outlet hole group 136 communicating with the water cavity 133; the multistage centrifugal pump 16 is respectively connected with the water inlet hole 135 and the circulating water tank 14; the jet pump 15 is connected with the steam outlet hole 32 and the condensation inlet 131 respectively.

The feed pump 6 is connected to the feed liquid inlet hole 21 through the shut-off valve 7 . The discharge pump 8 is connected to the liquid phase outlet hole 33; a balance valve 12 is provided between the upper chamber 9 and the steam outlet hole 32.

When the falling film evaporator with the distribution hole is equipped with a necking section, the steam enters the middle cavity 10 from the heating medium inlet 22 to heat the outside of the heat exchange tube 4; the feed liquid enters the upper cavity 9 from the feed liquid inlet hole 21, and passes through the distribution hole 51 is distributed into the heat exchange tube 4 to be heated, and under the action of gravity, it forms a film and flows down along the inner side of the heat exchange tube 4. The moisture in the feed liquid in the heat exchange tube 4 is heated and vaporized, and the generated steam and liquid phase pass through the gas-liquid mixing outlet 24 Together enter the evaporation chamber 3 for vapor-liquid separation, the liquid phase is discharged from the liquid phase outlet hole 33, and the steam is discharged from the steam outlet hole 32 under the action of the jet pump 15 and enters the side wall 132 through the condensation inlet 131; in the multi-stage centrifugal pump 16 Under the action, the cooling water in the circulating water tank 14 enters the side wall 132 from the water outlet hole group 136 through the water inlet hole 135 and the water cavity 133 to condense the steam.

The beneficial effect of this utility model is: the distribution hole of the distributor of the falling film evaporator of the falling film evaporator with the necking section provided with the distribution hole has a necking section which is beneficial to film formation, and the inner diameter of the main section is the same as that of the heat exchange tube. It can take into account the film-forming effect and uniformity as well as the film-forming liquid flowing along the inner side of the heat exchange tube and the falling speed. The structure of the steam condenser is simple, the cooling effect is good, and the cooling water is recycled to save water. The relative balance of pressure in the upper chamber and the evaporation chamber can be adjusted through the balance valve, which is beneficial for the material liquid to flow and descend in the form of a film along the inner side of the heat exchange tube under the action of gravity. The steam is discharged from the steam outlet hole and enters the middle cavity under the action of the compressor for waste heat utilization. The feed pump facilitates the feed liquid to enter the upper chamber, and the stop valve is used to control the flow of the feed liquid into the upper chamber; the discharge pump facilitates the liquid phase to be discharged from the liquid phase outlet hole.

It is obvious to those skilled in the art that the present utility model can be changed in many ways, and such changes are not considered to depart from the scope of the present utility model. All such modifications obvious to those skilled in the art are intended to be included within the scope of this claim.

Claims (4)

1. dispensing orifice is provided with a falling film evaporation device for necking segment, comprises falling film evaporator and vapour condenser; It is characterized in that: described falling film evaporator comprises the housing being provided with lower clapboard, vaporization chamber, several heat exchanger tubes, the distributor be connected with housing upper; Housing is separated into epicoele, lumen and cavity of resorption by distributor and lower clapboard; The lower end of heat exchanger tube is plugged in lower clapboard and is communicated with cavity of resorption; Distributor is provided with the number dispensing orifice identical with heat exchanger tube number; Dispensing orifice comprises two diameters principal piece identical with heat exchanger tube internal diameter, and diameter is less than the necking segment of principal piece diameter, the changeover portion that two two ends are connected with one end of necking segment one end and a principal piece respectively; The upper end of heat exchanger tube is connected with distributor and the upper end of each heat exchanger tube is communicated with a principal piece; Housing is provided with the liquor inlet hole be communicated with epicoele, the heat medium import be communicated with lumen and solidifying water out, and the gas-liquid mixed be communicated with cavity of resorption exports; Vaporization chamber is provided with the gas-liquid mixed inlet hole with gas-liquid mixed outlet, is positioned at the vapor outlet port hole at top and is positioned at the liquid-phase outlet hole of bottom.

2. dispensing orifice according to claim 1 is provided with the falling film evaporation device of necking segment, it is characterized in that: described vapour condenser comprises condensation chamber, is positioned at the cyclic water tank below condensation chamber, jet pump, centrifugal multistage pump multiple centrifugal pump; Condensation chamber comprise be provided with condensation import and shape be cydariform side enclosure wall be provided with water cavity and the water inlet plate be connected with side enclosure wall upper end; The upper surface of water inlet plate is provided with the inlet opening be communicated with water cavity; The lower surface of water inlet plate is provided with the apopore group be communicated with water cavity; Centrifugal multistage pump multiple centrifugal pump is connected with inlet opening and cyclic water tank respectively; Jet pump is connected with vapor outlet port hole and condensation import respectively.

3. dispensing orifice according to claim 1 is provided with the falling film evaporation device of necking segment, it is characterized in that: be provided with balanced valve between described epicoele and vapor outlet port hole.

4. the dispensing orifice according to claim 1 or 2 or 3 is provided with the falling film evaporation device of necking segment, it is characterized in that: also comprise feed pump, stop valve, discharging pump; Feed pump is connected with liquor inlet hole by stop valve; Discharging pump is connected with liquid-phase outlet hole.