HIGH CAPACITY VAPOURIZER FOR CHLORINE, SULPHUR DIOXIDE AND AMMONIA
STEAM HEATED VAPOURIZER
The design & manufacture of Steam Heated Vaporizer meets Chlorine Institute recommendations for liquid Chlorine vaporization by low pressure steam. The vapourizer design pressure of 300 lbs meets Chlorine Institute recommendations with corrosion allowance of 3 mm on chlorine side and 1.5 mm on steam side.
Series NCV-01 Vapourizer is of heavy duty construction. The internal and external surface of the vapourizing chamber can be easily inspected during servicing which is an unique feature of the design. Ease of cleaning is an added advantage to remove the sediments. Suction trap has a sacrificial chamber provided at the gas outlet, which protects the main body from corrosion attack.
The Steam chamber has nozzle connections for steam inlet, condensate outlet and chlorine chamber have nozzles for venting & pressure gauge, pressure switch and pressure relief valve. Insulation on shell must be done by the client at site.
ADVANTAGES OF HIGH CAPACITY 'NCV' SERIES VAPOURIZERS
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Liquid chlorine enters at the bottom of vapourizer ensures complete draining of liquid chlorine.
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Dual liquid inlet nozzle at the bottom ensures proper liquid flow in the event of sediments present in liquid chlorine clogging any one of the nozzle.
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Heating surface inside the vapourizer and the liquid chlorine outside the tube ensures no heating loss and hence no insulation of vapourizer is required.
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Ease of cleaning liquid chlorine chamber without dismantling is possible by opening the blind flange at the bottom entry for flushing operation. Refer manual for details of operation.
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Space saving design occupies very little floor space.
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Ease of maintenance and inspection of the heat transfer area by visual inspection is possible.
OPERATING PRINCIPLE
In operation, liquid is introduced through liquid inlet, which is connected to the bottom of the vapourizer. Here the liquid rises to contact sufficient heating surface to meet the vapour demand rate. After equilibrium is reached, vapourizer operates at essentially on container pressure.
As gas demand reduces, the gas pressure at the vapourizer raises and reduceing the inflow of liquid feed. On sudden shut down of gas valve, liquid would be forced out of vapourizing chamber back to the container.
With evaporation, the vapour raises through the vapour baffle to the super heating chamber, enters the suction trap and leaves through the gas outlet. Suction trap collects moisture and prevents such moisture from corroding vapourizer chamber. Since suction trap is not a pressure part it can be severely corroded without impairing operation or safety.
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TO PLACE THE SYSTEM IN OPERATION |
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1. |
Open steam valve (3) |
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2. |
Allow vapourizer to warm, admit liquid slowly by opening the valve to vapourizer. Liquid flows due to the gas pressure prevailing in the container. |
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3. |
Observe vapour pressure gauge (10) to come in line with liquid pressure gauge (1) |
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4. |
Open valve (11) |
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5. |
The pressure regulating valve (13) is factory set to reduce the gas pressure. |
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6. |
Operate the flow control valve (14) to control the gas flow |
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7. |
Interlock
Low steam pressure switch (16) is set at 0.2 Kg/sq.cm. in steam chamber. The pressure switch is interlocked to the automatic shut of valve on gas line (17) to prevent liquid flooding in the absence /failure of heating media steam. |
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8. |
Observation
Observe the temperature on gauge (7). It must read above 4 deg.C than the ambient. This superheat prevents reliquefaction of gas in down stream of vapourizer gas line. It also indicates the healthy condition of vapourizer. If the superheat reduces less than 2 deg.C it indicates the fouling has occurred in the liquid chamber of vapourizer demanding cleaning of the internal surface. |
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TO SHUT DOWN THE SYSTEM |
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1. |
For Regular shut down operation close the liquid valve to the vapourizer and completely allos the gas to be consumed. Make sure the pressure gauge (10) falls to ‘0' indicating the gas empty in vapourizer. |
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2. |
Alternate shut down
During emergency or intermittent operation sudden gas stoppage may be required. During this period close the gasoline valve (11) but keep all the liquid line valves open. The pressure balances so that the vapourizer gas phase remains equal to the container gas pressure |
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MATERIALS OF CONSTRUCTION OF VAPOURIZER |
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Shell & tube |
ASTM A106 Gr.B/SA 516 Gr.60/70/sqv. |
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Flanges |
ASTM A105 |
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Dip pipe |
ASTM A106 Gr.B |
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Suction trap |
ASTM A106 Gr.B |
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Gaskets |
Lead |
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DESIGN PARAMETERS |
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Design Pressure |
300 psig. |
CAUTION
