40 TPD SPRAY DRYING PLANT

40 TPD SPRAY DRYING PLANT

 

I     TECHNICAL PARAMETERS / DESIGN BASIS :

1	System offered	: Spray Drying system with Nozzle type automation and    Bagging Cyclone .
2	Operating hours	: 20 hrs.
3	Feed Product	: Concentrated Skimmed Milk
4	Feed rate	: 4311 kg/hr
5	% of SNF in feed milk	:  45 %
6	Product output rate	: 2000 kg/hr (40 TPD) with max. 3% moisture.
7	% Moisture in powder	: 3 %
8	Evaporation capacity	: 2311 kg/hr.
9	Air temperature	: Inlet - 1900 Outlet / Exhaust  - 900C
10	Product outlet temperature	: 350C
11	Heating medium	: Steam at 15 bar g.
12	Material of construction	: Contact parts – SS 304. : Non contact parts – Carbon Steel.   The entire construction shall be based on hygienic principles   with all the Stainless surfaces with acceptable sanitary finish     and all the carbon steel surfaces painted with food grade epoxy      paint.

1.       Feed Tank :   1 No.                                               

One no. tank shall be provided for feed to spray dryer. The tank shall be made in SS 304 and shall be provided with top cover, bottom nozzle and unions. Volumetric capacity of the tank shall be 50 lit.

2.       High pressure Feed Pump :  1 No.

 A feed pump, Triplex plunger, high pressure type, in SS 304 construction, with drive motor and Variable Frequency Drive, to develop a pressure of 300 bar g at delivery.

3.       Forced Draft Fan :  1 No.

A forced draft fan of centrifugal type with radially backward vanes shall be supplied. This fan shall be provided with Pulley & belt drive arrangement, drive motor and a common base frame assembly. It shall be equipped with an inspection door, cushy foot anti-vibration pads, inlet and outlet flexible connections. The material of construction shall be Carbon steel.

The F.D. fan shall also be provided with an Air Filter at the suction side. The filter elements shall be contained in Carbon Steel frame. 

4.       Cold air ducting: 1 Set     

Air ducting up to the F.D. fan suction shall be provided in Carbon Steel construction.

5.       Air Heater : 1 No.                    

A Cross flow air heat exchanger shall be provided for heating the air to 190 C. The heat exchanger shall have finned tubes in GI  construction carrying steam and shall have air in the plenum, which also shall be made in GI. The tubes shall be placed vertical and the air shall flow in a cross manner horizontally. 

6.       Hot air ducting :  1 Set.

The ducting between the air heater and the air distributor at the spray drying chamber shall be in Carbon Steel construction

7.       Drying Chamber  : n1 No.

The spray drying chamber shall be made in SS 304 with the inner portion being the contact portion finished in the sanitary finish of 150 grit. The chamber shall be suitable for nozzle type atomiser & Rotary Atomiser.

The main portion of the chamber shall be in form of a cylindrical shell. The bottom shall be in form of a cone. The shell and the cone shall be provided with stiffeners from outside using Carbon steel structural tees and channels. A set of sight glass, light glass and access door shall be provided on the shell. The cone shall be also provided with electrically operated hammers placed on mounting brackets.

The chamber   shall also be provided with a motorised rotary valve at the bottom outlet of the cone for sealing during collection of the powder.

8.       Air distributor assembly : (Suitable for Rotary Wheel and Nozzle Atomation)                                           1 Set

An air distributor assembly with contact parts is SS 304 shall be supplied to ensure uniform distribution of hot air for drying. The air distributor assembly shall be placed at the top of the cylindrical shell and shall offer calculated resistance to air to ensure the required pattern of the air flow.

9.       Spray nozzle :  1 Set.          

The Spray nozzles are positioned below the air distributor level and shall be 3 nos.

10.    Rotary Wheel atomiser with drive motor : 1 Set.

11.    Cyclones : 1 No.

A high efficiency cyclone shall be provided for the recovering the dust carried over by the Exhaust air. This Cyclone shall be provided with a bottom vortex breaker and a motorised rotary valve for sealing. The cyclone shall have an efficiency of collection of 99.5% of D50 particles and shall be placed between the spray dryer and the exhaust fan. The cyclone shall be constructed in SS 304.

 A rotary valve in SS Construction shall be provided at the bottom of the cyclone.  A recycle circuit with roots blower in SS 304 construction shall be provided to send the cyclone collection back to the chamber in the atomisation zone.

12.    Exhaust fan : 1 No.

 The exhaust fan shall be of Induced draft type in Carbon Steel construction. The fan shall be designed to effectively handle the exhaust gases at 90 C. The other accessories provided shall be base frame, variable speed belt pulley drive, antivibration pads, shaft cooling arrangement, flexible connection along with damper at the inlet and the flexible connection at the outlet.

13.    Bagging Cyclone :  1 Set

The bagging Cyclone shall be provided along with the ducting. The product shall be collected here. An extraction fan shall be supplied for conveying of the product to the bagging cyclone.   

14.    Electrical Panel  : No.

 A Electrical control panel shall be provided in damp proof construction out of CRCA sheets of thickness 14/16 gauge and painted with synthetic enamel paint .A mimic diagram of the flow sheet of the plant shall be supplied printed on acrylic sheet. The panel shall be equipped with fuses, contactors, relays,  sequential timer,  The panel shall be pre-wired and tested before despatch. One set of electrical cables shall be supplied along with panel

a)     1 no Temperature control loop for controlling temperature - PID type  . 

b)     1 no digital temperature indicator for exhaust temperature ( 0- 200).

c)     1 no Digital temperature indicator for inlet air temperature (0-300).

15. Local instrumentation and indicators :  1 Set                             

       The supply shall include the following indicators to be given for local monitoring.

a)     Temperature gauges / thermometers mounted on :

- Inlet air duct

- Exhaust air duct

b)     Manometers

-          Chamber

-          Cyclone                            

-          Steam heater  

III.   UTILITIES REQUIRED :

1.   Electricity, 3 Phase, 415 V , 50 Hz.	: Connected Load – For Spray Dryer – 390 HP
2.   Steam – Dry & saturated	: For Spray Dryer - 5100 Kg/hr @ 17 bar (g)