General description:
       Closed-circle insert gas spraying drying engineering-- Closed-circuit circulation gas flow spray drying units is combined by nitrogen closed-circuit circulation system, gas spray drying machine, solid and gas separation, nitrogen gas back blowing dedusting, condensing cooling solvent recovery, steam heating, etc
　　
       Take the nitrogen as the conduction and heat transfer medium, realize not only drying material which contain organic solvent suspension or is the thick liquid or  viscous tubular shape but also recycle the solvent in pharmacy, biochemical, chemical,etc,areas. It has the advantages of low consumption ,energy saving and emission reduction. Adopt the closed-circulation technology, take the nitrogen as the conduction and heat transfer medium,the machine can realize drying material which contain organic solvent liquid, at the same time, take condensing cooling technology, it can realize recycling solvent.for improving the unit capacity of dry strength and drying production , the unit use gas flow spray drying technology---- liquid materials (solid content is 50%) is transported to the gas flow gun in the spray drying tower by peristaltic pump in drying process, (spray gun can be set 3-7 nozzle according to production capacity requirements)in there liquid material is atomization into droplets.and heat transfer with gas from up to down, heat convection contact and exchange each other, instantaneously can achieve the purpose of dry wet.Receiving finished products in the bottom, superheating gases is eduction in drying tower below by the circulation fan, the solid gas is separated by separator.solid powder materials which entrainmentedin in overheated air , cutting by whirlwind role of gas separator, settlement to separator bottom, then the receiving.Superheating gases twice go into the nitrogen counter blowing precipitator, realize the collection of materials which entrainment in gas.Waste gases into condenser, by cooling medium (condensation temperature is 3℃) condensation, and to realize the organic solvent recovery.Circulatory system by nitrogen complement, realize a new round of nitrogen closed-circuit circulation drying production to meet the above relevant industry industrialized production needs.
Considering inflammable and explosive characteristics of organic solvent,the unit adoptes on-line observe oxygen, overpressure bleeder and explosion-proof, explosion venting panel and other security technology means, through intelligent control technology to realize monitoring of oxygen and air pressure balance, automatic adjust control.When the air (oxygen)in the system discharge rate is more than 0.9 percent (v/v), detected oxygen device will give control system instructions to open the supplement valve to put nitrogen into the system until the fresh nitrogen oxygen residues returned to safety value range
(closed-circuit circulation system design for positive pressure, oxygen is through charging process to enter the circulation system)When the pressure value in the system is over setting (circulatory system pressure balance value is set to 0.02 mPa)pressure relinef device may obey the intelligent control center instructions, automatically open pressure pneumatic valve, eliminate overpressure gases.While explosion-proof and explosion venting panel device, is another safety technical measures of this equipment.That is when some troubles happened in electrical or key parts fault happens, make the system can not work normally, air pressure rise to security limit (system design compression value is less or equal to 0.05 Mpa), explosion-proof and explosion venting panel device (explosion-proof and explosion venting panel device is combined by anti-blast film, explosion venting panel pilot valve and explosion venting panel components) will automatically open directional explosion venting panel and automatically shut off the power and closed in pipe valves, maximum limit avoiding casualties and property losses, to ensure safety in production.
 
Technology (flow chart) : calls for the details.
 
Superiority：
 
1）This unit takes nitrogen as the conduction heat transfer medium and carrier, in the airtight condition, achieve closed-circuit circulation, effectively achieve to safely dry the material which contain organic solvents liquid , and protect the easy oxidation or  wet materials getting oxidation resistance in the drying production process.
2）By using gas flow spray drying technology,the unit realizes the nitrogen dynamic atomization which traditional centrifugal spray drying can’t do it to the materials which is high solid content, and have glue shape or thick liquid shape , increases production and reduce more than 70% energy consumption,to reach the significant effect of energy-saving and high production.
3）The unit has the function of online monitoring and self-diagnosticate to ensure dry the materials which contain organic solvents safely production and intelligent control system can realize automation.
4) the unit realizes to recycle the materials which contain organic solvent in drying progress. on the basis of solving the problems such as drying exhaust emission heavy pollution in relavant industries, and obtain the effect of energy conservation and emission reduction.
 
Note: at present, this project has been applied for a patent for invention, two patents for practical new-type.