SU1209242A1 - Film evaporator - Google Patents

Description

one

The invention relates to tubular instrumentation of chemical plants, in particular to film evaporators, and can be used for inserting heat-sensitive liquids.

The purpose of the invention is to increase the productivity and intensify the heat exchange process by reducing the droplet entrainment of products with vapors and controlling the flow rate of the circulating fluid.

Figure 1 shows the evaporator in longitudinal section, general view; on

Fig. 2 illustrates a fluid flow regulator. I

The evaporator contains a vertical housing I, fixed tube sheets 2 and 3, heating pipes 4 provided in the upper part with slit distributors 5 of liquid, and a central circulation pipe 6 of small volume. In the lower part of the circulation pipe 6, a transport device 7 is mounted on the shaft of a shielded electric drive 8. The lower part of the circulation pipe 6 with the transport device 7 is placed in a glass 9 installed above the bottom 10 of the evaporator. The upper part of the circulation pipe 6 projects above the upper tube sheet 2 and ends with a conical junction. In this conical junction, the cone 11 freely moves on the rod 2 with the thread in the bob 13, which terminates the rod 12. The rod moves along the threads of the adjusting screw 14 with the head 15 and the handle 16. On the head 15 of the adjusting screw 14 the rod 12 is suspended and it located in the socket of the rack 17, which limits the movement of the adjusting screw 14 on the vertical axis and installed on the evaporator at the top 18. The rod 12 passes through the hole hermetically fixed on the cap 18 of the evaporator sleeve 19 with keyway in which the stem key 20 is located. The bobbin 13 of the stem 12 and the evaporator lid 18 are hermetically attached to the bellows 21. A damper 22 is fixed to the stem 12 above the cone 11, coaxially mounted to the ring distributors 23 and 24, respectively, one with a gap outside the damper 22, and the other between the outer row of pipes 4 and vertical wall krppki 18, which is located

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choke 25 for feeding raw materials. The evaporator is equipped with nozzles 26 of the output of the concentrated product and the vapor outlet 27, the discharge of the medium 28, the inlet and the outlet of the coolant 29 and 30. The apparatus operates as follows.

The initial fluid through the nozzle 25 enters the upper tube grid 2, when a certain level is reached, it is distributed evenly by slotted distributors 5 along the inner surface of the heating pipes 4 and flows down in the form of a film 5 into the bottom 10 of the evaporator, filling the cup 9 with the glass immersed in it the lower part of the circulation pipe 6 with the transport device 7. When the electric drive B is turned on, the transport device 7 injects fluid into the circulation pipe 6 and supplies it to the conical junction, where the regulating cone 11 sets vaets desired gap 25 Collateral chivshsschy predetermined performance.

The adjusting cone 11 moves along the vertical axis by turning the knob 16 of the adjusting screw 14, on the valve head 15 of which the brush 12 is suspended, the head valve 15 is located in the socket of the stand 17, which limits the movement of the screw 14 on the vertical axis. NIN depressurization evaporator in

places welding bellows in case of accidents

situations. (.

Adjustment screw movement 14

from the very bottom to the very top40

 The TH position is matched with the fit of the cone 1 1 in the conical junction of the circulation pipe 6. To maintain the sealing of the film evaporator while the cone is moving

 II installed bellows 21, compensating for changing the position of the bob

13 rod 12 on the vertical axis.

To prevent stem rotation

12 with a cone 11 on the rod 12 is installed a key 20, which slides in the keyway of the sleeve 19 along the vertical axis. When leaving the upper part of the circulation pipe through the gap between the cone 1 and the walls 55 of the conical junction, the liquid gets onto the damper 22. From the walls of the damper 22, the liquid flows to the tube sheet 2 inside the ring distributor 23, leaving the hole through the holes, mixes with the original liquid V11 ring distributor 24. Next, the liquid of average composition through slit distributors 5 spreads over the inner surface of the heating tubes 4. The vapors formed during

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the passage of fluid through the heating pipes 4 is removed through shtutser 27. Concentrated product is discharged through fitting 26. Inlet and outlet 5 of the heat transfer fluid is carried out through fittings 29 and 30. When emptying the evaporator, the fitting 28 uses the medium to drain.

27.

7 /

18

28

1

sixteen

1715

13

FIG. 2

Claims (2)

1. FILM EVAPORATOR containing a vertical casing with a cover and a bottom, horizontal tube sheets installed between the body, a bottom and a cover and forming a heating chamber, heating pipes fixed in tube sheets in a heating chamber, a distribution ring placed along the axis of the upper tube sheet housing and made with windows in its lower end, the central circulation pipe located along the axis of the housing, the upper end of which is placed inside the distribution ring, and the lower end is located on the bottom, transport a mounting device installed on the bottom and placed in the lower end of the circulation pipe, and fittings for input and output of the initial liquid, vapors, and concentrated product, characterized in that, in order to increase the productivity and intensify the heat transfer process by reducing drip entrainment of products with vapors and regulation flow rate of the circulating liquid, it is equipped with an additional distribution ring with windows located on the upper tube sheet outside the pipes and coaxially to the main distribution ring, olnennymi at its lower end, an inverted cup, mounted for displacement in vozvratnopostupatelnogo ver. in the vertical direction coaxially above the upper end of the circulation pipe, made in the form of a conical funnel, and mounted on the lid coaxially above the funnel, a fluid flow regulator with a reverse truncated cone, movably placed in the funnel and located inside the inverted cup. 2. Evaporator according to π.1, πη4 and with the fact that the fluid flow regulator is made in the form of a bellows valve with a stem on which an inverted cup is fixed. SU. „. 1209242>