| *Evaporators Types and Design | | | | evaporator will suffer corrosion and supply the |
| Evaporation is an operation used to remove a liquid | | | | electrical current needed to protect the structure. |
| from a solution, suspension, or emulsion by boiling off | | | | SAFE & SELF ADJUSTABLE CAPACITY |
| some of the liquid. It is thus a thermal separation, or | | | | Evaporator cannot fill with liquid to build excessive |
| thermal concentration, process. The evaporation | | | | pressure because its liquid level is self-adjusting. An |
| process is one that starts with a liquid product and | | | | automatic shut-off and pressure reducing valve is |
| ends up with a more concentrated, but still liquid and | | | | included. A water temperature control thermostat |
| still pump-able concentrate as the main product from | | | | and contacts for low water temperature alarm are |
| the process. During the design of evaporation plants | | | | also included. Other devices, as optional are high |
| Legal regulations, materials of construction and | | | | water temperature alarm switch; a gas temperature |
| surface finishes,product's heat sensitivity, viscosity | | | | gauge on the instrument panel; and a low water |
| and flow properties, foaming tendency, fouling and | | | | alarm actuated by a level probe. |
| precipitation, boiling behavior,costs for operation and | | | | Because the evaporation rate is self-adjusting, the |
| maintenance,operating media,Site conditions etc., | | | | proper liquid level is always maintained in the gas |
| have to be considered.There are different | | | | chamber. The proper water bath level is maintained |
| evaporator types like Electrically heated, circulating | | | | by a make-up-water flow meter with a manual |
| hot water vapouriser. | | | | control valve. Or, an automatic make-up-water level |
| ELECTRICALLY HEATED EVAPORATORS | | | | system is optional, Level probes in this |
| CAPACITIES UPTO 200 Kg/hr E-205 | | | | resistance-type system open and close a solenoid |
| For Chlorine, also used for Sulfur Dioxide or Ammonia | | | | valve to maintain the proper water-bath level. |
| GENERAL Electrically heated evaporators are used to | | | | RELIABLE OPERATION FULLY AUTOMATIC |
| convert liquid chlorine as specified into gaseous state. | | | | This is a water immersed-tank heat exchanger |
| The unit has adequate controls and safety functions. | | | | specifically designed to evaporate liquid chlorine. Sulfur |
| Chlorine is available in liquid form but is generally | | | | dioxide of ammonia. Heat from a hot water bath |
| utilized as a gas. Chlorine gas is normally withdrawn | | | | converts liquid to gas. immersion type electric heaters |
| directly from containers when withdrawal rates do | | | | supply the heat. The evaporator is designed for |
| not exceed the container vaporization rate. If a large | | | | safety. It requires minimum maintenance. With several |
| quantity of chlorine gas is required, Chlorine | | | | options, operation can be fully automatic. |
| evaporators are used. | | | | Power Characteristics: 400-440 V. 3 phase, 50/60Hz |
| OPERATING PRINCIPLE | | | | * Dimensions: Dimension drawing numbers same as |
| Liquid chlorine is transferred from its source to the | | | | model numbers with prefix "DM". |
| evaporator chamber by container pressure. | | | | * Installation: Installation drawing numbers same as |
| This chamber is immersed in a controlled heated | | | | model numbers with prefix "IN". |
| water bath, which increases the temperature of the | | | | Materials of construction |
| liquid, causing it to boil. Liquid enters the chamber and | | | | * Cabinet: Fiberglass reinforced |
| maintains the required liquid level necessary to meet | | | | * Water chamber: Steel |
| the vaporization rate for the gas demand. A change | | | | * Vapourizing chamber: Steel |
| in gas demand will cause the chlorine liquid level to | | | | Accessories |
| adjust. The gas released, rises through baffles and | | | | Automatic water level control |
| superheated as it leaves the chamber. A superheated | | | | Immersion heater contractor |
| gas is required to prevent gas reliquefaction in | | | | Liquid lines |
| process piping. | | | | Gas lines |
| INSTALLATION | | | | Gas pressure reducing and shut-off valve |
| Location- The evaporator should be located close to | | | | Cathodic protection in water chamber |
| the source if possible. The length of liquid and gas | | | | Electric control panel |
| lines should be kept to a minimum. Container room | | | | Ordering information |
| with provisions for exhausting gas, if a leak develops, | | | | Model number |
| is ideal. A lifting device above the evaporator is | | | | Medium to be vapourized |
| recommended for servicing the chamber. | | | | Capacity (kg/h) |
| CATHODIC PROTECTION | | | | Accessories-required and optional |
| The water wetted surfaces of the evaporator are | | | | Installation and service |
| protected against corrosion by two sacrificial anodes. | | | | Specialized technicians are prepared to install and |
| The anodes being the most active metal in the | | | | service this and associated equipment. |