Installation of a spray drying and a method of its application

FIELD: production of powdery materials.

SUBSTANCE: the invention presents an installation with a fluidized layer and with a complex spray drying and a method of production of the powdery materials dried with the help of a spray drying, whose properties can be varied purposively depending on the application. The installation contains a spraying column, a fluidized layer, a module of a spray drying, one or several of additional spraying or pulverizing nozzles for a liquid component located in a fluidized layer, a batching gear for a powder and a powder returning gear with a fan. The module of a spray drying includes a spraying system consisting of a heated doublet spraying nozzle in which a liquid) component and sputtering air are merged. The installation contains also a dynamic filter integrated in it used for clearing of the gas of from a part of a powder. The spraying column is located above the fluidized layer. The latter for giving direction of motion of the stream of a powder it is supplied with a perforation in Conidur base. The module of a spray drying is located in the spraying column above a fluidized layer. The doublet spraying nozzle is supplied with the coaxially located powder returning gear and an enveloping stream of hot air. The spraying system is made in the form of an integrated module. In the method of production of a powdery material at the first stage the following components are combined: a liquid component, a spraying gas, a powdery material and hot air. The formed powdery product falls on a fluidized later, is caught up, fluidized and transported further. At one or more stages of granulation it is pulverized with an additional liquid component, dried and transported with the fluidized layer to the powder batching gear, from which a part of the powdery material is returned in the process. The invention ensures fast removal of surface moisture, prevention of granules adhesion and production of particles of the given size.

EFFECT: the invention ensures fast removal of surface moisture, prevention of granules adhesion and production of particles of the given size.

14 cl, 2 dwg

 

The invention relates to the fluidized bed with integrated spray drying and to a method of manufacturing a powdery material, dried by spray drying, whose properties can purposefully vary depending on the further application.

Commercially available granular materials are usually obtained by spraying the solution or suspension of one or more components in the spray column filled with hot gas. A stream of hot gas liquid components evaporate and the solids that have a more or less arbitrary shape.

Also known granulation in the fluidized bed, in which the flow of process air passes through with a special form of the boot base, forming a fluidized bed of solid source material. The sprayed liquid is supplied into the space for fluidization in a fully divided form through a system of nozzles. Fluidized particles hydrate, the surface is partially dissolved, and the particles stick together. At the end of the fluidized bed continuously removes solids. At the same time, a small amount of solids, fully sprayed in the spray liquid is fed to the inlet. The filter system prevents dust off pseudouridine the layer and serves the that only particles of granular material minimum size are deleted on exit. Thus, in the fluidized bed of this type are formed of solid particles in a more or less random forms.

The objective of the invention is to provide a suitable installation and method of installation, with which the properties of spray dried or granulated, powdered products can vary by the relative particle size, distribution of particle size, moisture content and the ability to pelletizing.

The task of the invention is achieved by the proposed installation of spray drying, spray containing column, fluidized bed, the module spray drying, including spray system consisting of a heated two-component spray nozzle that combines a liquid component and spray the air, one or more additional spray or spray extraction nozzle for the liquid component, located in the fluidized bed, a dosing device for powder and vozvratit powder with a fan. According to the invention, the installation also contains integrated in it a dynamic filter to release gas from a portion of the powder, while the spray column is located above the dog is doriginal layer, the latter to give direction to the flow of powder is provided with perforations at the base Conidor and module spray drying is spray column above the fluidized bed, while the two-component spray nozzle provided with a coaxially located with the return of the powder and the surrounding stream of hot air.

One or more spray or spray extraction nozzle for the liquid component can be installed in the fluidized bed in various positions.

When the fluid layer may adjoin separated from him paddle valve dosing device for powder, powered through a drain.

Part of the formed product according to the invention to return a stream pipeline, in which the fan acts as a carrying element, and, if necessary, at the same time as grinding device to return the powder to the module spray drying.

In a particular implementation of the invention, the module raspylitelnoj drying may include a spray system consisting of a heated two-component spray nozzle that combines a liquid component and spray the air, which is in accordance with the invention can be provided with a centrally located return the threshold is and the surrounding stream of hot air, and actually spray system can be implemented in a single module.

The objective of the invention is also solved with the help of its proposed method of production of powdery material is dried by spray drying, namely, that at the first stage are combined liquid component of the atomizing gas, the powdered material and hot air, resulting powdery product falls on the fluidized bed, picked up, oijala and transported further, in one or more stages of granulation sprayed with additional liquid component, dried and transferred psevdoozhizhennom layer to the metering installation for powder, from which a portion of the powdery material is returned to the process. In accordance with the invention the specified method is carried out in the proposed apparatus for spray drying with the above design features.

As the liquid component, it is preferable to use a solution, dispersion or suspension.

The specific point of the method according to the invention lies in the fact that the return powdered material is crushed before it is returned.

As a sputtering gas, and gas-carrier, and the heating gas is preferably air or an inert gas selected from SOS is oasa of N 2, CO2group.

When the gas circulates through the loop.

During the process of circulating the gas released from the particles by means of a filter and again served on the spray nozzle or heated and injected into the fluidized bed.

Preferably the gas release from the particles using dynamic filters.

Used liquid component may have different compositions in different points of the installation.

A particle size of from 50 to 1000 μm can be set by changing the parameters of pressure atomization, fluid intake, amount of the returned powder, the flow of hot air and hot air temperature.

The invention is further illustrated by the example setup for spray drying and the example of the method for manufacturing a powdery material at the facility with reference to the accompanying drawings, where:

figure 1 shows the General technological scheme of installation for spray drying according to the invention,

figure 2 shows the spray system in the longitudinal section of the installation for spray drying.

Figure 1 shows a generalized process diagram of a possible embodiment of an installation for spray drying, in which numbers and/or letters have the following meanings:

1 - camera introduction of air,

2 - camera removal of air,

3 - port download,

4 - supply the hot air,

5 - fluid flow,

6 - sprayed the air,

7 - heating agent,

8 - product

9 - powder,

And the installation of fluidized bed,

In module spray drying,

With - granulation nozzle

D - dosing device for powder,

E - fan to return powder,

F - lobed valve

G - dynamic filter.

For implementing the method of installation charge first powdered raw material through the port 3 download. The air flow is generated in the field of spray drying using the camera 1. Source material pseudogiants by means of this air flow and moves towards the outlet vane valve F. the Flow of powder give direction to education airflow suitable perforated base Conidor. Fluid product can be released by simply opening the rotary valve F. At this point the set of devices that facilitate the flow of product or dosing device for powder, or in the module spray drying. Drain 8 for the final product is placed on the output over dosing device for powder. Fan E module spray drying is used simultaneously as a means for transfer of the product and as a device for grinding for the return of powdery material. Wealth is giving special design nozzle spray drying, return the powdered material from the return line 9 is combined with the corresponding liquid component 5, a spray air 6 and the hot air 4. The resulting powder or granular material embraces the fluidized bed and transported further, as already described above. When passing through the granulation nozzle With an additional component, which may have a composition different from the component introduced into the spray nozzle with the return of the powder is sprayed on the formed particles. There is a further granulation and change the size distribution of the particles. The air supplied from the camera 1 through the base Conidor, dries the product to the desired final moisture content. Dynamic filter G, integrated in the installation, prevents leakage of the powder particles in the environment.

Instead of three granulation nozzle, as shown in figure 1, the corresponding pixel units are arranged one or more spray nozzles or nozzles spray drying or in an alternative embodiment, only one, two or more than three granulation nozzle. These additional nozzles can be located directly at the beginning of the fluidized bed or shifted further to the end. The choice of location, which originally formed the powdered material is sprayed popcorn the one or more times, also depends, among other things, residual moisture content and the desired resulting product. Needless to say that a product with a particularly low content of residual moisture requires more time spent in the fluidized bed after the last spraying, than a product with a relatively high content of residual moisture.

Optionally, on the surface of already formed particles through a variety of nozzles can be applied to various songs, which allows to obtain a layered structure of the particles. However, it can also serve for a more narrow distribution of particle sizes.

Moreover, the installation according to the invention can operate not only with air as a migration tool, but it is also possible that the whole setup worked for circulation of inert gas, such as nitrogen or carbon dioxide.

The plant is designed in such a way that the parameters of the fluid, the spray pressure, the amount of the returned powder, the quantity of hot gas, hot gas temperature, amount, and temperature of warm air can be adjusted individually. The properties of the final product can be adjusted according to the desire regarding moisture content, particle size and distribution of particle size through the number of returned powder, the amount of padave the first liquid and the spray pressure. Powder products with a particle size of from 50 to 1000 μm can be obtained on request described in the installation. Depending on the operation mode particles may consist of a single chemical substance or a layered structure of different substances or, depending on the selected processing option, to have a more or less crystalline or predominantly amorphous structure, where, in the latter case, the particles can consist of either a single component or of a mixture of various components.

Particle formation is controlled, in particular, a spray nozzle, built in installation, suitable for the production of spray dried granular materials. A corresponding embodiment of the spray nozzle of this type is shown in figure 2.

This spray nozzle is a spray system consisting of a two-component spray nozzles 1, 2 and 3, which can be heated with hot water and, in turn, equipped with a coaxial return powder 4 and the surrounding hot gas stream 5.

The advantage of this spray system is that directly at the outlet of the powder comes in contact with the liquid droplets generated by spray extraction air, and granulated or aglomerated. To the granules do not stick together and the surface is tnou moisture could be removed, spray and powder particles are included in the stream of hot gas, where the energy required for evaporation of the liquid, is passed directly. Subsequent drying takes place in the fluidized bed.

In particular, thanks to the introduction of this system, spray drying, it is possible to achieve a specific particle size.

A special advantage of this setup for spray drying is that with the help of one such installation, you can produce very different products depending on the options specified for sprayable liquid component.

Taking into account the components mentioned in the description and shown in the flowsheet, the specialist in the art it is easy to construct the appropriate installation, by selecting commercially available individual components. There is no need to explain to the person skilled in the art that both of the additional control module, electrical and mechanical, should be included in the technological scheme of installation, to be able to regulate and vary the process parameters, as described.

1. Installation for spray drying, spray containing column, fluidized bed (A), the module spray drying (In), which includes a spray system consisting of a heated two-component spray the tion of the nozzle, combines a liquid component and spray the air, one or more additional spray or spray extraction nozzle (S) for the liquid component, located in the fluidized bed (A), the dosing device (D) for powder and vozvratit (9) powder with fan (S), characterized in that it contains also integrated into the dynamic filter (G) to release gas from a portion of the powder, while the spray column is located above the fluidized bed (A), the latter for giving direction to the flow of powder is provided with perforations at the base Conidor and module (C) spray drying is spray column above the fluidized bed (S), with a two-component spray nozzle provided with a coaxially located with the return of the powder and the surrounding stream of hot air.

2. Installation for spray drying according to claim 1, characterized in that one or more spray or spray extraction nozzle (S) for the liquid component can be installed in the fluidized bed in various positions.

3. Installation for spray drying according to claim 1, wherein the fluid layer adjacent separated from it flow valve (F) of the dosing device (D) for powder, powered through a drain (8).

4. Installation for races is ylitalo drying according to claim 1, characterized in that a portion of the resulting product is returned stream pipeline, in which the fan (S) acts as a carrying element, and, if necessary, at the same time as grinding device to return the powder to the module spray drying.

5. The spray system consists of a heated two-component spray nozzle that combines a liquid component and spray the air, characterized in that the two-component spray nozzle provided with a coaxially located with the return of the powder and the surrounding stream of hot air, and the spray system is designed as a module.

6. Method for the production of powdered material, dried by spray drying, namely, that at the first stage are combined liquid component of the atomizing gas, the powdered material and hot air, resulting powdery product falls on the fluidized bed, picked up, oijala and transported further, in one or more stages of granulation sprayed with additional liquid component, is dried and is transferred from the fluidized bed to the metering installation for powder, from which a portion of the powdery material is returned to the process, characterized in that the way the OS is p in the plant for spray drying according to any one of claims 1 to 4.

7. The method according to claim 6, characterized in that the liquid component is a solution, dispersion or suspension.

8. The method according to claim 6, characterized in that the return powdered material is crushed before it is returned.

9. The method according to claim 6, characterized in that the air or inert gas selected from consisting of N2, CO2group, used as a sputtering gas, and gas-carrier, and heating the gas.

10. The method according to claim 6 or 9, characterized in that the gas circulates through the loop.

11. The method according to PP, 9 or 10, characterized in that the circulating gas is released from the particles by means of a filter and again served on the spray nozzle or heated and injected into the fluidized bed.

12. The method according to any of PP, 9-11, characterized in that the gas released from the particles using dynamic filters.

13. The method according to claim 6 or 7, characterized in that the liquid component has a different composition in different parts of the installation.

14. The method according to any of PP-13, characterized in that the particle size from 50 to 1000 μm can be set by varying the pressure of the spray fluid, the amount of the returned powder, the flow of hot air and hot air temperature.



 

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FIELD: separating materials by evaporation.

SUBSTANCE: method comprises evaporating in several stages. In the preliminary stage, the aluminate solution is evaporated by the secondary steam supplied from the final stage and heated up to 20-60oC before supplying to the intermediate stage. In the intermediate stage, the solution is evaporated by live steam. Before supplying to the final stage, the solution is mixed with the circulating solution and is evaporated by the secondary steam supplied from the intermediated stage. The device comprises evaporating apparatus with vertical heat exchanging pipes. The end stage is connected with pipelines for supply of initial aluminate solution and secondary steam from the second housing and pipe line for discharging evaporated solution which is connected with the first housing and provided with a heater. The first housing is in communication with the second housing provided with circulation circuit and chamber for boiling of solution arranged above the heat exchanging pipes. The first housing is provided with circulation pipe and external chamber for boiling of solution.

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