JPS58183902A - Vacuum evaporation type crystallizing apparatus - Google Patents

Abstract

PURPOSE:To enhance the heat efficiency of the titled apparatus, by providing a vertical multiple effect boiler to the upper part of a crystallizer to use steam generated in the crystallizer for the evaporation of a liquid to be treated. CONSTITUTION:When a vacuum installation 12 is driven to introduce a liquid 2 to be treated into a vacuum evaporation type crystallizing apparatus by a liquid supply pipe 1, the liquid 2 to be treated is heated to a temp. corresponding to steam pressure shown by the evaporation part 13 of the upper stage A of said apparatus to be sprinkled over said upper stage A from a distributor 6 as hot water. Subsequently, the liquid 2 to be treated is succeedingly evaporated while flowed down through a vertical multiple effect boiler 16 to be flowed into a crystallizer 15 as a concentrate where heated by steam 10' passing through the jacket 11 of a side wall part and steam 10' passing through the shaft 20 of a stirrer 19 and gradually forms a crystal comprising only a solute while a large amount of steam is generated to discharge the crystal from an outtake port 9. As the result, by using steam generated in the crystallizer 15 for the evaporation of the liquid 2 to be treated, effective utilization of heat can be attained.

Description

[Detailed description of the invention] The present invention relates to a vacuum evaporation type crystallizer.

Improving thermal efficiency is an important factor in evaporating water from various solutions and efficiently concentrating them to obtain crystals.

In conventional equipment that combines a multi-effect tank and a crystallizer, the steam generated in the multi-effect tank part of the concentration section is effectively utilized, but a large amount of steam generated from the crystallizer is simply used as an inlet cover. It is only used to heat the processing solution.

This cannot be said to be an effective use of the large amount of steam generated.

In other words, in a conventional device that combines a multiple-effect can and a crystallizer, the temperature of the liquid to be treated in the crystallizer placed in the latter stage is lower than that of the liquid passing through the multiple-effect can used in the previous stage for the purpose of concentration. It is lower than the temperature of the processing liquid, and the operating pressure of the crystallizer is lower than that of the multiple effect tank. Therefore, the temperature of the steam generated in the crystallizer is lower than the temperature of any steam generated in the multiple-effect can, so the steam generated in the crystallizer is directly \ the steam generated in the multiple-effect can. The entire peripheral wall of the crystallizer is usually heated with a steam jacket to promote the concentration of the liquid to be treated and increase the crystallization rate, as well as to maintain heat. Therefore, it is a place where a large amount of steam is generated.

However, in the conventional case, the steam generated from the crystallizer is mainly used for heating the feed liquid.

Therefore, in a conventional device combining a multi-effect can and a crystallizer, the amount of heat discharged to the outside of the system may be larger than the total amount of heat used.

The object of the present invention is to provide a new vacuum evaporation type crystallizer with high thermal efficiency, which allows a large amount of vapor generated from such a crystallizer to be effectively used in its original state.

That is, the present invention provides an integrated structure of the crystallizer and the vertical multi-effect can by installing the vertical multi-effect can on the top of the crystallizer, and the uppermost stage of the crystallizer and the vertical multiple-effect can. A vacuum evaporation type characterized in that the uppermost condensation section and direct air equipment are communicated with each other through a steam communication pipe, and the steam generated in the crystallizer is used for evaporating the liquid to be treated. Regarding a crystallizer.

This will be explained in detail below.

The drawing is an explanatory diagram showing the flow of the vacuum evaporation type crystallizer of the present invention, in which a vertical multi-effect can 16 is installed above a crystallizer 15, and the two are integrally constructed. Also, crystallizer 1
5 and the uppermost stage A of the vertical multi-effect can 16 through a steam communication pipe 17.
At the same time, the condensing section 14 of the uppermost stage A and the vacuum equipment 12 are communicated with each other in one day by piping.

The vacuum equipment 12 is driven and the liquid to be treated 2 is guided to the vacuum evaporation type crystallizer through the liquid to be treated pipe 1.
The liquid to be treated 2 that has entered the condensation section 14 of the uppermost stage A is generated in the crystallizer can 15 with the vapor generated in the uppermost stage A via the heat transfer coil 3, and passes through the uppermost stage A. The vertical multi-effect canister 1 is heated by indirectly transferring heat to and from the steam.
Of the steam generated in the second stage B of the vertical multi-effect can 16, which is led to the heat transfer coil 4 provided in the condensing part 14' of the third stage C of 6, It is indirectly heated by the steam that could not contribute to the evaporation of the liquid to be treated in step 13'. Then, the liquid to be treated 2 is further indirectly heated by a part of the steam 10 that is introduced from the outside and guided to the heat transfer coil 5 provided in the condensing section 14'' of the second stage B. The hot water becomes hot water having a temperature equal to or higher than the vapor pressure indicated by the evaporator section 13 of the uppermost stage A, and is sprayed from the distributor 6 to the uppermost stage A.

A part of the sprayed liquid 2 to be treated is evaporated in flash, and a part is evaporated by absorbing the latent heat of evaporation from the large amount of vapor sent through the crystallizer 15 through the heat transfer tube, and does not participate in evaporation. The liquid to be treated temporarily accumulates on the partition wall 8 and flows down onto the heat transfer tube 7' provided in the second stage B.

A part of the flowing liquid is heated and evaporated by the steam 10 introduced from the outside through the heat exchanger tube. In this way, the liquid to be treated 2 continues to evaporate as it flows down the pot.
The concentrated liquid flows down to the crystallizer 15, where it is heated by the steam 10' passing through the jacket 11 on the side wall and the steam 10' passing through the shaft 20 of the stirrer 19, and gradually dissolves the solute while generating a large amount of steam. It becomes a crystalline body and is carried out from the outlet 9. The evaporated steam and the condensed water of the steam 10 introduced from the outside are stored separately and discharged or recovered.

Note that since air is taken in from the condensing section 14 of the uppermost stage A by the vacuum equipment 12, each effect can and crystallization can 15 are in a reduced pressure state.

In addition, since the uppermost stage A has the lowest pressure, the water to be treated can be boiled by passing the relatively low-temperature steam generated in the crystallizer 15 through the heat transfer tube 7 without particularly supplying steam 10 from the outside. can be done.

As explained above, in the vacuum evaporation crystallizer of the present invention, a vertical multi-effect can is installed on the top of the crystallizer, thereby making the two into an integrated structure.

Piping and pumps for transporting the liquid to be treated can be omitted, reducing installation space and manufacturing costs. Also, by using the steam generated in the crystallizer to evaporate the liquid to be treated, heat can be effectively used. Utilization can be measured, and operating costs can be significantly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing shows an example of an embodiment of the present invention and is an explanatory diagram showing the flow of a two-vacuum evaporation type crystallizer. 1... Liquid pipe to be treated 2... Liquid to be treated 3... Coil for heat transfer 4... Coil for heat transfer 5... Coil for heat transfer 6... Distributor 7...・Heat transfer tube 8...Partition wall 9...Outlet
10... Steam 11... Jacket 12... Vacuum equipment 13... Evaporation section 14... Condensation section 15.
...Crystallization can 16...Multi-effect can 17...
Steam communication pipe 1st...Piping 19...Agitator
20...Axis A...Top stage B...
Second paragraph C...Third paragraph procedural amendment (voluntary) July 1980 IZ Director General of the Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Application No. 67217 2 Name of the invention Vacuum evaporation Mold crystallizer 3 Relationship with the case of the person making the amendment Patent applicant (ti% 5-5-16 Hongo, Bunkyo-ku, Tokyo Name (440) Organo Co., Ltd. Representative Eiji
Kunio Ii 4, Agent 113 Address 5-5-16 Hongo, Bunkyo-ku, Tokyo Column 6 for claims and detailed description of the invention in the specification subject to amendment
Amended content/% Revise the scope of claims as shown in the attached sheet 1゜2,
On the 4th to 3rd lines from the bottom of page 3, [Direct air equipment 1] is corrected to [Vacuum equipment]. Hereinafter, the Seventh Patent, F'1-Claim By installing a vertical multi-effect can on the top of the crystallizer,
The crystallization can and the vertical multi-effect can are integrally constructed, and the crystallization can and the top stage of the vertical multi-effect can are communicated with each other before steam communication, and the condensation section of the top stage and the nasal passage equipment are connected. Vacuum nine-hole type crystallizer that is characterized by communicating through piping and using the steam generated in the crystallizer to evaporate the liquid to be treated.

Claims (1)

[Claims] By installing a vertical multi-effect can on the top of the crystallizer,
The crystallizer and the vertical multi-effect can are integrally constructed, and the crystallizer and the top stage of the vertical multiple-effect can are communicated through a steam communication pipe. A vacuum evaporation type crystallizer characterized in that the uppermost condensing section and the direct air equipment are connected through piping, and the steam generated in the crystallizer is used for evaporating the liquid to be treated.