SU1344381A1 - Evaporation apparatus for crystallizing solutions - Google Patents

Abstract

The invention relates to chemical engineering and, in particular, to a synthetic apparatus for crystallizing solutions, and allows increasing the size and uniformity of production salt crystals, increasing productivity by increasing the operating time of the apparatus between washes. The evaporator contains a tubular vertical heating chamber, a boiling tube placed in the separator, a return circulation tube, a cylindrical conical salt separator equipped with a cylindrical shell, the lower end of which is located in its conical part with the formation of an annular gap, and the upper is attached to the lower tube sheet heating the chamber along its perimeter, while the reverse circulation pipe is connected tangentially to the salt separator. After the transfer into the cylindrical part of the salt separator through this pipe, the solution receives a rotational motion around the shell, resulting in the separation of the solution, the classification of crystals by size. The area of the cross section and the annular gap between the cylindrical shell and the conical part of the salt separator is 1-1.5 of the cross section of the cylindrical shell, which ensures the content in the circulating solution of 10-20% of the solid phase. 1 hp f-ly, 2 ill. F (L co 4; 4 co oo

Description

The invention relates to chemical maitin construction, in particular to evaporation apparatus for crystallizing solutions, which are used in the chemical, metallurgical, food and other industries.

The purpose of the invention is to increase the size and uniformity of salt production crystals and to increase productivity by increasing the operating time of the apparatus between washes.

FIG. 1 shows an evaporator for crystallizing solutions, a general view; in fig. 2 is a section A-A in FIG. one.

The device contains a heating chamber

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fine crystals of salt are captured by the upward flow of the upper layer of precipitated crystals and come with a solution into the inner part of the cylindrical shell. The area of the annular gap between the cylindrical shell and the conical part 6 of the salt separator, equal to 1-1.5 of the cross-sectional area of the cylindrical shell 7, maintains K) -20% of the solid phase in the circulating solution, which allows basically removing the supersaturation of the solution on the surface of salt crystals and this leads to an increase in the operating time of the apparatus between washes and crystal growth. Left on internal20

a pipe 2 of boiling, a separator 3, a reverse t5 of the conical part 6 of the separator, a circulation pipe 4, a salt separator made in the form of a cylindrical part 5, a conical part 6 and including an internal cylindrical shell 7.

Evaporator works as follows.

In the heating chamber 1, the evaporated solution is superheated relative to its boiling point in the separator 3 and boils in the tube 2 boils. In the process of boiling in the separator 3, part 25 of the solvent (water) is removed from the solution and the solution becomes supersaturated in the crystallizing salt. By keeping the salt crystals in the circulating solution, the supersaturation of the salt in large crystals is lowered into the bottom of the salt separator, in which a homogeneous production suspension is removed.

As a result of this design, local salinity of the tubes of the heating chamber is prevented, due to which the capacity of the evaporator and the operation time between washes are increased.

Claims (2)

1. An evaporator for crystallizing solutions containing a tubular vertical heating chamber, a bobble pipe. Evaporator for crystallizing solutions containing tubular vertical heating chamber, tube Mostly, it is removed on the surface of the finished crystals and when new crystals are formed, the cylinders are placed in the separator. From the separator 3 on the reverse circus conical salt separator installed under the heating chamber, a reverse circulation pipe located between the separator and the salt separator, different in that, in order to increase the size and uniformity of the production salt crystals and increase productivity by increasing the operating time of the apparatus between washes, the salt separator is provided with a cylindrical shell, the bottom shell - the lindrical part 5 of the salt separator, the product of which is located in its conical part, is preliminary separated, and partly with the formation of an annular gap, and the upper one is attached to the lower tube rail of the heating chamber along its perimeter, with The tailpipe 4, the solution enters tangentially into the cylindrical part 5 of the salt separator. Rotating around the inner cylindrical shell 7, the solution reaches its lower edge. When the solution rotates due to the centrifugal effect, salt crystals are deposited on the inside of the salt separator, and in the area of the conical part 6 cyoblast the final separation, as the solution receives the maximum speed of rotational motion by reducing the cross section through which the solution moves. After the solution passes the level of the lower slice of the inner cylindrical shell 7 of the salt separator, the motion of the solution changes, the effect of the tangential effect decreases, therefore 45 This reverse circulation pipe is connected tangentially to the salt separator. 2. An apparatus according to claim 1, characterized in that the cross-sectional area of the annular gap between the cylindrical shell and the tapered portion of the salt separator is 1 -1.5 of the cross-sectional area of the cylindrical shell. fine crystals of salt are captured by the upward flow of the upper layer of precipitated crystals and come with a solution into the inner part of the cylindrical shell. The area of the annular gap between the cylindrical shell and the conical part 6 of the salt separator, equal to 1-1.5 of the cross-sectional area of the cylindrical shell 7, maintains K) -20% of the solid phase in the circulating solution, which allows basically removing the supersaturation of the solution on the surface of salt crystals and this leads to an increase in the operating time of the apparatus between washes and crystal growth. Left on the inside Renna conical part 6 salt separator Large salt crystals sink to the bottom of the salt separator, in which a homogeneous product suspension is withdrawn. As a result of this design, local salinity of the tubes of the heating chamber is prevented, due to which the capacity of the evaporator and the operation time between washes are increased. Invention Formula 1. Evaporator for crystallizing solutions, containing a tubular vertical heating chamber, boiling tube, placed in a separator, a cylindro-conical salt separator, installed 45 This reverse circulation pipe is connected tangentially to the salt separator. 2. An apparatus according to claim 1, characterized in that the cross-sectional area of the annular gap between the cylindrical shell and the tapered portion of the salt separator is 1 -1.5 of the cross-sectional area of the cylindrical shell. ffmapu hbiu steam rpewujtjt / / 7Cf / y Ocherl7lenn & / c ynapeH i, / u pacmSop t / cxa f / e / f pac / TTffop Cpu & i A-A cycrreffstju Editor H. Kishtulinets Order 4561/7 Compiled by E. Sotnikova Tehred I. Veres Corrector A. Zimokosov Circulation 656 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 (puaZ