SU850097A1 - Evaporator with external boiling area - Google Patents

Description

(54) A STEAM DEVICE WITH AN ENTRANCE OF BOILING ZONE

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 The invention relates to evaporation equipment used in the chemical, food industries and non-ferrous metallurgy, and more specifically to evaporators with a central riser tube in a circulation loop.

Apparatuses with forced circulation are known, comprising a heating chamber, a circuit with a riser introduced into the separator along its axis, a chimney and a TIJ circulation pump.

Also known devices with one or more flat or cylindrical partitions in the lifting tube f2.

However, in such devices, the solution, the entrance to the bottom of the separator, after turning in the knee of the riser tube, acquires hydrodynamic heterogeneity, i.e. in the flow, the axisymmetry of the velocities over the cross section is violated, which inevitably causes an intense rocking of the solution level in the separator and a number of technologically harmful consequences arising from it. The rocking of the multi-ton mass of the solution in the volume of the separator is transmitted in an alternating form

vibrations to the whole body of the apparatus, loosens its fasteners and supporting building structures, limits the intensification of the evaporation process, increases the lottery of the product with secondary steam.

The closest in technical essence to the proposed. is an apparatus containing a separator, connected to it by means of a circulation pipe, a heating chamber installed along the axis of the separator, an boiling pipe with a longitudinal partition 3.

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A disadvantage of the known apparatus is the fluctuation of the level of the liquid in the separator.

The purpose of the invention is to stabilize

20 of the evaporation process and increase the reliability of the apparatus by eliminating fluctuations in the level of liquid in the separator.

This goal is achieved by the fact that the 25 NTO partition in the boiling tube is made screw.

Claims (1)

FIG. 1 shows an evaporator, a general view of / in FIG. 2 and 3 embodiments of the partitions in 30 boiling pipe. The evaporator comprises a separator 1, a boiling pipe 2 with a longitudinal partition 3 installed at the outlet of the pipe 2 located in the separator 1 along its axis, a heating chamber 4, a circulation pipe 5. The partition 3 is made curved along a helical line in the form of a plane twisted 90 ° (FIG. 2), or in the form of a three-blade element, screwed 90 ° (figure 3). Another implementation of the partition is also possible. The diameter of the partition (in plan) is equal to the inner diameter of the riser, and its optimal length is l, 5d. The evaporator is operated as follows. From the heating chamber 4, the liquid enters the rotary bend of the boiling tube, where it acquires a hydrodynamically non-uniform structure: one half (in the longitudinal section has a greater pressure than the second, and, accordingly, a lower speed fn V If different living forces and the half of the flow is not equalized, then the leveling of the level occurs.The screw surface of the partition 3 averages the energy imbalance of the masses of the liquid ejected from the pipe 2 into the volume of the separator 1. The inertial energy of the vortex motion of the medium, which prevents the swinging effect of the E level of the solution. The hydraulic resistance of the partition 3 at a flow rate of up to 1.5-2.0 m / s is insignificant (1018 mm water column). An evaporator with a septum made in the form of a helical surface possesses new hydrodynamic KIM quality: there are no unbalanced inertial forces in the solution mass and this resolves the contradiction between increasing the reliability of its operation and intensifying the evaporation process. The implementation of the partition 3, curved along a helix, contributes, in addition, to reduce sprigunosa. Thus, there is no need to install a bump stop. The listed advantages of the proposed invention open up the possibility of further intensifying the process of evaporation, eliminate the need to create enhanced vibration-resistant building structures, as well as periodic repairs to the attachment points of the apparatus to the supports. In addition, product loss with the splash splash is reduced. The evaporator of the proposed design was tested under various operating conditions on a model installation under the conditions of hydrodynamic similarity of fluid flow and found the ability to completely eliminate the swinging of the solution level. Claims: A boiling-off evaporator containing a separator, a heating chamber connected to it via a circulating tube, and an boiling-up tube mounted along the separator axis with a longitudinal partition, characterized in that, in order to stabilize the evaporation process and. improving the reliability of the apparatus by eliminating fluctuations in the level of liquid in the separator; the partition in the boiling tube is screwed. Information sources,. taken into account during the examination 1. USSR copyright certificate №207208, cl. B 01 O 1/10, 1968. 2i. Levin R.E. New evaporator. M., 1957, p. 135, 178. 3. USSR Author's Certificate No. 610532, cl. B 01 D 1/00, 1978. PiJt.2 Vut. 3