O u r E q u i p m e n t

2 010

Wastewater Vacuum

Evaporators

Engineers Brochure

C&G Depurazione Industriale– Since 1989

Manufacturer of Vacuum Evaporators - a machine that provides a cost effective solution for dozens of industries. There are many uses for this type of equipment, and more get uncovered as time goes on.

They can be the best choice in a materials recovery scenario, such as with Jewelers or other companies that have metals or oil in their wastewater.

In other examples, they can significantly reduce the need for costly waste disposal .

In the following pages, you will see some information about how the equipment works, and the various models available.

We are available if you have any technical questions, please forward them by email to:

R E C E N T N E W S F R O M C & G

4 / 15 / 2 0 0 9

P r e s s R e l e a s e : C & G D e p u r a z i o n e I n d u s t r i a l e , a m a n u f a c t u r e r o f i n d u s t r i a l w a s t e w a t e r t r e a t m e n t e q u i p m e n t , h a s r e c e n t l y f i n i s h e d i n s t a l l a t i o n o f a w a t e r t r e a t m e n t s o l u t i o n a b o a r d a n o i l d e r r i c k i n t h e S o u t h C h i n a S e a . T h e e q u i p m e n t i n s t a l l e d w a s a n e x p l o s i o n p r o o f , a n t i -c o r r o s i v e , V- N T 3 5 0 0 I I G AT E X S e r i e s v a c u u m e v a p o r a t o r f o r a m a j o r w o r l d o i l c o m p a n y . T h e d e s i g n i s s i m i l a r t o t h e s t a n d a r d m o d e l b u t t h e h e a t p u m p c y c l e u s e s a n o p e n d r i v e s c r e w c o m p r e s s o r w i t h a n AT E X c e r t i f i e d m o t o r , a n d g a l v a n i c b a r r i e r s t o e n s u r e c l e a n c o n t a c t s f o r t h e m e a s u r i n g i n s t r u m e n t s w h i c h a r e n e c e s s a r y f o r t h e a u t o m a t i c w o r k i n g o f t h e m a c h i n e . A n a n t i e x p l o s i v e c o n t r o l p a n e l g u a r a n t e e s t h a t a n y e x -p l o s i o n r e m a i n s i n s i d e t h e p a n e l . T h i s m a c h i n e i s s u i t a b l e f o r a Z o n e 2 a r e a w h e r e t h e r e i s t h e r i s k o f e x p l o s i o n .

REDUCE the consumption of water as required by your activity, by treating the effluent and putting water suitable for industrial activity back into the system.

REDUCE, up to 90%, the costs by simply ‘concentrating’ those substances which have to be sent for disposal. The concentration, or the reduction of the vol-ume, can reach 20 times the original volume. (For example: 1000 Liters : 20 times = 50 times concentrate)

ELIMINATE any risk of incurring sanctions from the Authorities responsible for environmental protection.

RECOVER raw materials

ADVANTAGES OF

C&G EVAPORATORS

Extremely compact construction

Fully automatic working cycle, eliminating the need for observa-tion

Run on any energy source available Low energy consumption Total absence of fumes or smell Constant parameters of the

resulting effects 24 hour performance Custom designed to meet

specific requirements

V - NT Series

BENEFITS OF EVAPORATOR TECHNOLOGY

S o m e I n d u s t r i e s W e H av e S o l d t o :

Steel / Galvanization

Wire Drawing

Automobile / Motor Winemaking

Chemical

Ink / Print

Juice / Soft Drinks

And Many More! Call for Info Regarding your Industry!!

C o p y r i g h t C & G D e p u r a z i o n e I n d u s t r i a l e

Production capacity of distillate: from 200 to 1,000 liters in 24 hours or about 50 to 265 US gallons

Power Supply: electric or alternative energy source

Limit of concentration: concentrated discharge as wet sediment or crystals, at the suction capacity limit of traditional pumps.

Energy cost: one third more than that of the evaporator with sub-merged coil

1. Compressor 2. Heat-exchanger shell 3. Boiling vessel 4. Undercooler for refrigerant 5. Thermostatic expansion valve 6. Condensation chamber 7. Ejector 8. Reservoir for accumulating distillate 9. Vacuum distillate pump 10. Electro valve for feeding product 11. Hand operated valve for

discharging concentrate

E S S E R I E S

Page 7

E S S E R I E S - ( P I C T U R E )

C o p y r i g h t C & G D e p u r a z i o n e I n d u s t r i a l e

These are the most commonly applied evaporators, and work using a refrigerating system with a heat pump under vacuum.

They are vertical development evaporators with automatic discharge.

Production capacity ranges from 40 to 6,350 US Gallons in 24 hours

Page 9

The cooling compressor (n.1) compresses the refrigerant gas. Thanks to the effect of the compression the gas heats up and reaches the temperature of approx. 60-70 degrees C.

The compressed gas is then pushed into the serpentine coil in the boiling chamber (n.2) in the VS Series (vertical), or into the side-walls in the ES Series (for ultimate concentration to almost any dry condition).

The above serpentine has the function of heat-exchanger. It stays, in fact, in the liquid to be concentrated and re-leases almost all of the heat generated by the compressed Refrigerant gas.

As soon as the pre-set temperature is reached inside the boiling chamber (n.2), the liquid starts boiling and we have obtained the first effect of distillation: the liquid to be concentrated has converted from liquid to steam.

Let’s now follow the route of the refrigerant gas. After almost all the heat has been released into the boiling chamber (n.2), the gas needs to lose further heat and this is obtained by passing the refrigerant gas through the chamber(n.2), the gas needs to further lose heat and this is obtained by passing the refrigerant gas through the heat exchanger (n.3), which has a through-flow of either air or water.

At this point the refrigerant has released its heat to the liquid to be concentrated and it is then conveyed into the ser-pentine arranged in the condensation chamber (n.4). On contact with the cool surface of the serpentine, it will condensate and come back into liquid form. From the bottom of the condensation chamber it will then be sucked by the ejector (n.5) and conveyed to the reservoir (n.6), which makes it possible for the distillate to be extracted continu-ously, without breaking the vacuum, and thus without the need of making another vacuum again after the discharge.

The system can be run either non-stop ro at time intervals, and is fully automatic due to a series of safety devices which intervene with light-signals in the case of malfunctioning.

The compressor for the Refrigerant gas is sealed and auto-lubricating and its duration is equal or longer to that of the life of a house-refrigerator of an air-conditioner.

The C&G machine takes advantage of the principle of boiling in a vacuum condition, and is fed by an electric current or other alternative energy source, which, through a refrigerating cycle and relevant heat pump, allows the distillation to take place at low costs.

The diagram shows how the evaporator Is composed of:

A cooling compressor for Refrigerant gas (n.1) A boiling chamber (n.2) A heat exchanger, by air or water (n. 3) A condensation chamber (n. 4) A pump for the ejector (n. 5) A tank for the distillate (n, 6) A discharge pump for the concentrated sludge (n. 7)

C o p y r i g h t C & G D e p u r a z i o n e I n d u s t r i a l e

M E S E R I E S

C h a r a c t e r i s t i c s o f m u l t i - s t a g e E v a p o r a t o r s

These evaporators are used to treat wastewaters from different types of industrial processes.

Energy, under the form of heat, has to be supplied when a solution must be evaporated. Electric energy

is generally used to feed the refrigeration compressor in the vacuum evaporators, but when this is not

possible, alternative energy sources can be used (methane, GPL, etc.).

The principle component of the evaporation costs is related to the expenses for heating and evaporating

the solution which has to be treated.

Various methods have been studied to reduce this expense, and one of the most commonly used at an

industrial level is multi-stage evaporation. There are a number of evaporators placed in series in these

systems, and each of these is called a stage.

The solution which has to be concentrated is sent to the various boiling chambers, which each have a

heat exchanger. Vapour circulates in the tubes of the heat exchanger and heats the solution which has to

be treated, causing the evaporation.

The vapour used for the single stage evaporators has to be sufficient to allow all the solution to evapo-

rate.

In the case of multiple stage evaporators, however, the evaporation process is divided into various stages

and it is necessary to produce vapour only for the first stage.

1ST 2ND 3RD

Page 11

Taking a typical example:

Evaporator 30 m3/day with three stages:

In this particular case the system is composed of three evaporators in series “EV1”, “EV2”, “EV3”.

In order to reduce to a minimum the energy necessary to produce 30 m3/day of distillate, the three evaporators must work at differ-ent temperatures and pressures.

In particular a situation must be created where.

T1 > T2 > T3

P1 > P2 > P3

The solution to be treated is sent to both evaporators in parallel.

The heat generated by one boiler is sent to the heat exchanger “E1” in the first stage.

This vapour condenses and allows the evaporation of the solution in boiling chamber “EV1” to be treated.

In this stage vapour is generated that can be used in the second chamber “EV2” to evaporate the solution to be treated.

The vapour developed in boiling chamber “EV2”is re-condensed in the heat exchanger “E2” using a cooling circuit with water.

The cooling water which is necessary to re-condense the vapour produced in “EV2” is supplied using an cooling tower.

The vapour developed in boiling chamber “EV3” is re-condensed in the heat exchanger “E3” using a cooling circuit with water.

The cooling water which is necessary to re-condense the vapour produced in “EV3” is supplied using an cooling tower.

this document is C&G' s property and it shall neither be reproduced, copied, disclosed to others, nor used for any purpose other than that for wich it is specifically furnished without the prior written consent of C&G.

C&G DE PURAZIO NE INDUST RIA LE S.r.l.

Via 1° Maggio s.n.c.50067 ROSANO - RIGNANO S/A FIRENZE

TITLE:

SCHEMA DI FUNZIONAMENTO

SCALE: JOB:

DATE: DWG Nr.:08/11/01 FIG:12 .3

CONCETRATEDISCHARGE

PRODUCT TO BETREATED

METANOO ALTRO

BOILER

P1

ARIA

P = P1 P = P2 P = P3COOLING TOWERT = T1

P5

P2 P3 P4

P6 P7 P8

DISTILLATEDISCHARGE

T = T2 T = T3

EV1 EV2 EV3

E 1 E 2 E 3

E 4

C o p y r i g h t C & G D e p u r a z i o n e I n d u s t r i a l e

M E S E R I E S – C O N T I N U E D

Characteristics of the BOILER:

The vapour which must be produced by the boiler is a function of the heat supplied in the first stage of the evaporator.

The greater the number of stages used in the evaporation, the less vapour needs to be supplied to the system, with a consequent decrease in the energy consumption fed to the boiler.

The boilers normally used are those with “instant vaporisation”.

They are supplied with a burner and internal heat exchanger. Water circulates in this exchanger and is evaporated at a pre-established temperature and pressure.

The vapour formed in this way is that necessary to send to the multi-stage evaporation system.

Characteristics of the COOLING TOWER:

The cooling water necessary for the re-condensation of the distillate formed during the evaporation process is pro-vided by a cooling tower.

This achieves the cooling of the water through contact with air.

The towers are made up of a circular or rectangular casing immersed in a tank.

The water to be cooled is channelled from the top, while the air enters from below.

The towers which are generally used are those with a forced draught. The ventilators are placed in the upper part and work through suction.

The cooling is obtained as a certain quantity of water evaporates, especially in the summer months.

The circulation of the cooling water from the collecting tank in the tower to the multiple-stage evaporation system is guaranteed by a circulating pump.

AIR AIR

WATER TO BE COOLED

COOLED WATER

TANK FOR WATER COLLECTION

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Technical Characteristics and Consumption

Three-Stage Evaporator 30 m3/day. (~8000 US gal.)

Type of evaporator Three-stage ME 30000

Working principle Circulation of vapour/cold water

Evaporated water, in Gallons x hour 330

Heat exchanger Submerged coil

Energy required 326 kW / hour

Hot service fluid (to heat waste water in first

stage) Steam at low pressure and 120°C or Hot Water

at 90°C (or 248°F / 194°F

Cold service fluid (to chill vapour in last stage) Water from Cooling Tower at 35 °C (95°F)

Standard Supply voltage °C 400 Volts – three-phase - 50 Hz

C o p y r i g h t C & G D e p u r a z i o n e I n d u s t r i a l e

Detail of the condensation coil in the upper part of an evaporator.

CONCENTRATORS for the ENRICHMENT of ORGANOLEPTIC characteristics

Framework of a Triple Effect Evaporator under preparation.

Our Technician Roberto Galli, in action

Ver 1.2

Synoptic panel with luminous commands for automatic functioning

EVAPORATOR 5000 Lt/day LEAVING FOR TURKEY

Departure of our VN-T Evaporator, 10.000 Litres/day for China

Solid nickel residue from a galvanic bath.

Via I M

aggio, snc — L

oc Rosano

50067 Rigano sull’A

rno—F

irenze, Italia T

el. +39.055.83003450 - +

39.055.8303454 F

ax +39.055.8303368

matt@

cgrepinfo.com - w

ww

.cgrepinfo.com

Since 1979 s

.r.l. DE

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