Condensate Recovery and Return System SDR A

Transcription

1 Condensate Recovery and Return System SDR A Condensate tank of rectangular design type SDR A with high-pressure centrifugal pump(s) installed next to the tank Condensate tanks are used to collect the condensate coming from steam users or flash vessels. From the tank the condensate is pumped into the feedwater tank by a level-controlled pump, in most cases via a deaerator. Rectangular condensate tank type SDR A The standard range of rectangular condensate tanks is designed for condensate flowrates of up to 10 t/h and a max. service pressure of 0.1 bar g. Tank made of steel type S235JRG2 (RSt 37-2), inside: untreated, outside: anti-corrosion coating with two condensate pumps and accessories installed next to the tank, e. g. bimetal dial thermometer, water-level indicator, GESTRA level electrode and control for automatic pump operation, non-return valves, shut-off valves, high-pressure centrifugal pump(s) and pressure gauge. Completely assembled and interconnected, control cabinet supplied but not mounted. Max. condensate temperature 90 C Size Volume Pumping Discharge Pump l capacity m 3 /h head mws capacity kw Vessels in compliance with Conformity Assessment Section 3, Paragraph 3 Optional extras Plastic coating type A up to max. 130 C Plastic coating type B up to max. 95 C 136 Tanks and valves made of other materials available on request. Other pumping capacities and discharge heads on request.

2 Condensate Recovery and Return System SDR I Condensate tank of rectangular design type SDR I with submersible condensate pump(s) bolted on top Condensate tanks are used to collect the condensate coming from steam users or flash vessels. From the tank the condensate is pumped into the feedwater tank by a level-controlled pump, in most cases via a deaerator. Rectangular condensate tank type SDR I The standard range of rectangular condensate tanks is designed for condensate flowrates of up to 10 t/h and a max. service pressure of 0.1 bar g. Tank made of steel type S235JRG2 (RSt 37-2), inside: untreated, outside: anti-corrosion coating installed with two*) submersible pumps on top and related accessories and valves, such as: bimetal dial thermometer, water-level indicator, GESTRA level electrode and control for automatic pump operation, non-return valves, shut-off valves, submersible pump(s) and pressure gauge. Completely assembled and interconnected, control cabinet supplied but not mounted. Max. condensate temperature 90 C *) Except size 1 (only available with one pump) Size Volume Pumping Discharge Pump l capacity m 3 /h head mws capacity kw Vessels in compliance with Conformity Assessment Section 3, Paragraph 3 C Optional extras Plastic coating type A up to max. 130 C Plastic coating type B up to max. 95 C Tanks and valves made of other materials available on request. Other pumping capacities and discharge heads on request. 137

3 Open-Type Condensate Recovery and Return Tank SD L 100 Condensate receiver tank of cylindrical design type SD L (S) with high-pressure centrifugal pump(s) installed next to the tank L = horizontal design; S = vertical design Size Optional extras Plastic coating from D = 1000 mm onwards possible: type A up to max. 130 C Plastic coating from D = 1000 mm onwards possible: type B up to max. 95 C Other valve and tank materials available on request. Other pumping capacities and discharge heads on request. 138 Volume Pumping Discharge Pump l capacity m 3 /h head mws capacity kw I II III IV V VI VII VIII IX X Max. condensate temperature 90 C Condensate tanks are used to collect the condensate coming from steam users or flash vessels. From the tank the condensate is pumped into the feedwater tank by a level-controlled pump, in most cases via a deaerator. Open condensate tank of cylindrical design type SD L (S) The standard range of cylindrical condensate tanks is designed for condensate flowrates of up to 30 t/h and a max. service pressure of 1 bar. Higher flowrates available on request. Tanks available as horizontal and vertical design, made of steel S235JRG2 (RSt 37-2), inside: untreated, outside: anti-corrosion coating with two high-pressure pumps and associated valves and accessories installed next to the tank: e. g. bimetal dial thermometer, pressure gauge assembly, water-level indicator, level electrode and control for automatic pump operation and non-return valves. Completely assembled and interconnected, control cabinet supplied but not mounted.

4 Closed-Type Condensate Recovery and Return Tank SD L 130 Condensate receiver tank of cylindrical design type SD L (S) with horizontal-type centrifugal pump(s) installed next to the tank L = horizontal design; S = vertical design Size Volume Pumping Discharge Pump l capacity m 3 /h head mws capacity kw I II III IV V VI VII VIII IX X Optional extras Plastic coating from D = 1000 mm onwards possible: type A up to max. 130 C Other valve and tank materials available on request. Other pumping capacities and discharge heads on request. Condensate tanks are used to collect the condensate coming from steam users or flash vessels. From the tank the condensate is pumped into the feedwater tank by a level-controlled pump, in most cases via a deaerator. Closed condensate tanks of cylindrical design type SD L (S) The standard range of cylindrical condensate tanks is designed for condensate flowrates of up to 30 t/h and a max. service pressure of 4 bar. Higher pressure ratings and flowrates available on request. Tanks available as horizontal and vertical design, made of steel boiler plate type P265GH (H II), inside: untreated, outside: anti-corrosion coating with two horizontal-type centrifugal pumps and associated valves and accessories installed next to the tank: e. g. bimetal dial thermometer, pressure gauge assembly, magnetically operated liquid level gauge, level electrode and control for automatic pump operation, safety device, overflow, air vent, vacuum breaker, shut-off valves and non-return valves. Completely assembled and interconnected, control cabinet supplied but not mounted. 139 C

5 Steam Powered Condensate Return Tank KH Condensate tanks are used to collect the condensate from steam processors or flash vessels. From the tank the condensate is returned to the main condensate tank or deaerator with the aid of level-controlled booster steam. Steam-powered condensate return unit KH... The standard version is suitable for condensate flowrates of up to 10 t/h and a max. service pressure of 13 bar g. Tank made of steel type S235JRG2 (RSt 37-20) or of P265 GH (H II), inside: untreated, outside: anticorrosion coating. Associated valves and equipment such as pressure gauge assembly, level electrode and control for automatic booster steam supply, non-return valves. Completely assembled, interconnected and equipped with counter-flanges, bolts and gaskets. For larger condensate flowrates use our condensate recovery and return systems. Size Volume Pumping Discharge Pump l capacity m 3 /h head mws capacity kw KH KH KH KH Other tank and valve materials available on request. 140

6 Steam Powered Condensate Return Tank FPS 14 Size Volume Pumping Discharge Pump l capacity m 3 /h head mws capacity kw FPS FPS For more information on booster steam pressure, capacities and discharge head refer to data sheet. Other tank and valve materials available on request. Condensate tanks are used to collect the condensate from steam processors or flash vessels. From the tank the condensate is returned to the main condensate tank or deaerator with the aid of level-controlled booster steam. Steam-powered condensate return unit type FPS The condensate is returned to the main condensate tank with the aid of booster steam, without electric power. The standard version of the FPS 14 is suitable for condensate flowrates of 6 t/h and a max. service pressure of 13 bar g. The discharge capacity decreases with rising back pressure. The tank is made of steel type S235JRG2 (RSt 37-2) or of P265GH (H II), inside: untreated, outside: antirust paint, and equipped with non-return valves. Completely assembled and interconnected, inclusive of counter-flanges, bolts and gaskets. C For larger condensate flowrates use our condensate recovery and return systems. 141

7 Desuperheating Plants System 1 Steam outlet Electric pressure regulation Cooler with equipment Injection cooler with fixed jet orifices System 2 Control valve Atomizer steam Superheated steam System 3 Desuperheater Electric temperature control Drain Cooling water inlet Steam inlet Pressure reducing station Injection cooler with binary unit Steam outlet Controller URR 3 Control valve Cooling water Pressure reducing station Steam inlet Heating installations in all industries Heating of drying calenders in the paper industry Heating of boiling pans in the foodstuff industry Heating of cable presses Radiant panels for hardware production in the electrical industry Steam moistening plants in the textile industry System Description System1 Injection cooler with fixed jet orifices The cooling water is injected through special jet orifices. The amount is adjusted by a control valve mounted upstream of the desuperheater. The type and number of nozzles are dictated by the operating data. The internals of the pipe installed downstream of the equipment prevent temperature shocks at the external pipe. System 2 Injection cooler with binary unit Cooling water and atomizer steam are injected through a jet. The kinetic energy of the steam is used for atomizing the water. The atomizersteam pressure has to be at least twice as high as the steam pressure. The cooling water can be cold, since it is preheated by the atomizer steam. System 3 Water-bath desuperheater Superheated steam is injected into the water contained in the desuperheater. The heat of the superheated steam is given up to the water. The steam produced is conducted through steam separating units and reaches a steam content of more than 98 %. Criteria for System Selection 1. What is the ratio between minimum and maximum steam quantity in the control range? 2. Is booster steam available at an appropriate pressure? 3. What is the pressure and the temperature of the available cooling water? 4. How close must the temperature of the desuperheated steam be to that of saturated steam? Questions concerning System Design 1. Maximum steam flow at inlet? 2. Minimum steam flow at inlet? 3. Maximum service pressure? 4. Maximum temperature at inlet? 5. Standard temperature at inlet? 6. Temperature at outlet? 7. Saturated-steam temperature? 8. Temperature of injected cooling water? 9. Injected cooling-water flow? 10. Cooling-water pressure at cooler? 11. Pump pressure? 12. Design pressure? 13. Design temperature? 14. Length of installation? Water level control Drain Cooling water Water-bath desuperheater Pump unit Technical Data System 1 System 2 System 3 Pressure rating [bar] Maximum temperature [ C] Cooling water pressure above steam pressure [bar] 5 > Steam > Steam Steam flowrate [t/h] Steam flow ratio 1 : 2 1 : 10 1 : 100 Set point above saturation temperature [K] Higher pressures, temperatures and steam flowrates available on request.

8 Steam Regenerators Steam regenerator Pure steam Condensate Feedwater Heating steam Intermittent/continuous blowdown Steam regenerators are used to produce saturated steam for a secondary system from steam or pressurized hot water. Pure steam, without any contaminants that might be detrimental to health such as hydrazine, is produced. Standard Installation Steam regenerators are therefore especially suited for sterilizing equipment in hospitals, steaming and drying chambers in the foodstuff industry, and for the production of distillates. Technical Data (standard) Service pressure primary [bar] 32 Service temperature primary [ C] 250 Service pressure secondary [bar] 13 Service temperature secondary [ C] 200 Capacity range [kw] 5000 Feedwater quality 1 ) [µs/cm] <=5 Boiler water quality 1 ) [µs/cm] <=100 Steam regenerators for higher pressure/ temperature ratings and larger capacities on request. Steam regenerators with self-acting heating-steam control Installation of compact design with manual intermittent/continuous blowdown control, basic equipment, electric feedwater supply control with solenoid valve. Technical specifications: Feedwater quality 1 ) < = 5 µs/cm. Max. heating steam pressure: 6 bar, max. pure steam pressure: 4 bar. Pure steam Overall Max. design Max. design Type flowrate length pressure/temperature pressure/temperature kg/h mm mm primary bar/ C secondary bar/ C GRDEm-S /200 6/200 GRDEm-S /200 6/200 GRDEm-S /200 6/200 GRDEm-S /200 6/200 Steam regenerators with electric heating-steam control Installation of compact design with automatic intermittent/continuous blowdown control, basic equipment, electric feedwater supply control with solenoid valve. Technical specifications: Feedwater quality 1 ) < = 5 µs/cm. Max. heating steam pressure: 6 bar, max. pure steam pressure: 4 bar. Pure steam Overall Max. design Max. design Type flowrate length pressure/temperature pressure/temperature kg/h mm mm primary bar/ C secondary bar/ C GRDEe-S /200 6/200 GRDEe-S /200 6/200 GRDEe-S /200 6/200 GRDEe-S /200 6/200 C 1) Recommended conductivity value at 20 C. EN

9 Feedwater Deaerating Plants To avoid corrosion damage to steam boiler plants, the content of aggressive gases, such as oxygen and carbon dioxide, in the feedwater must be as low as possible. The German Technical Supervisory Association (VdTÜV) has issued directives concerning boiler feedwater quality which are applied by German boiler manufacturers when giving a warranty on their boilers. Thermal deaeration in addition to chemical deaeration is very important for maintaining the required feedwater quality. Recommendation: For quality of soft water: Concentration of chloride approx. 50 mg/l Conductivity approx. 250 µs/cm Technical Data Max. service Max. service Capacity Materials pressure temperature range (DIN reference) 0.5 bar 111 C m 3 /h S235JRG2 (RSt 37-2) Residual oxygen < 0.02 mg/l Higher pressures on request 144

10 Flash Vessels Typ VD 11, VD 12, VD 13 Flash Vessels Systems Typ VD 23 und VD 26 Condensate from H.P. user Drain Flash steam outlet Condensate Flash Vessel Gas balance pipe to condensate tank Condensate flash vessel Condensate flash vessels can be used in all steam plants where condensate from steam processors is reduced to a lower pressure, so that flash steam is formed by revaporization. In the flash vessel the steam is separated from the water, and then fed into a low-pressure steam system. The condensate remaining in the flash vessel is discharged into a condensate tank Blowdown flash vessel Blowdown flash vessels are used if the flash steam formed downstream of continuous blowdown valves is to be utilized. Blowdown receiver In a blowdown receiver the sludge and water mixture withdrawn from the boiler by the intermittent blowdown valve is separated into flash steam and condensate (residual blowdown). Pressure-relief valve When pressure-relief valves of steam generators blow off, flash steam is formed which is discharged to atmosphere by a blow-off line. For reasons of safety, to avoid scalding of personnel and damage to equipment by hot water discharged through the blow-off line, a flash vessel is installed between pressure-relief valve and blow-off line where steam and water are separated. Blowdown flash-vessel system Flash steam Pressure relief valve Feedwater-tank with deaerator Hot water Live-steam supply Water Boiler Steam boiler Continuous blowdown valve Blowdown flash vessel Blowdown receiver Residual blowdown cooler downstream of a pressure-relief valve from feedwater tank Intermittent blowdown valve Cooling water Pulse from intermittent blowdown valve Technical Data Type Service Service Condensate Volume Material pressure [bar] temperature [ C] flowrate [t/h] [l] (DIN reference) VD to S235JRG2 (RSt 37-2) / VD to P265GH (HII) VD to VD S235JRG2 (RSt 37-2) / VD GG 25 VD P265GH (H II) / VD GS-C 25 C 145

11 Blowdown Receiver (Mixing Cooler) VDM Flash steam discharge or vent Hot water from intermittent/ continuous blowdown, overflow etc. Cooling water Thermostat Drain Mixed cooled water to drain Mixing cooler with cooling-water control and, if requested, additional flash-steam condensation Technical Data Max. service Max. Capacity pressure temperature range 0.5 bar 111 C up to 15 t/h Material S235JRG2 (RSt 37-2) P265GH (H II) Description Mixing coolers are blowdown receivers used to cool hot waste water that can no longer be used for heat recovery and is therefore discharged into a pit or drain. Process plants where contaminated, hot waste water is being formed. Steam boiler plants where the blowdown is cooled with untreated water. Mixing coolers for vapours. 146

12 Condensate Dampening Pot ED Steam main = 3 bar Condensate main = 0.25 bar Outlet Heat exchanger Passage or door frame Inlet Steam trap Condensate dampening pot Drain connection 1.25 bar Condensate Dampening Pot ED Technical Data Service Related Capacity Material Volume pressure temperature range [l] 18 bar 250 C up to 15 t/h steel plate 4 50 Description The condensate dampening pot provides a cushioning effect to neutralize waterhammer. The condensate is discharged without noise. Steam and condensate systems. C 147

13 Air / Steam Driers and Purifiers TD/TP (Steam Separators) Description Steam separators are used to remove condensate and dirty water carry-over from steam. By this means troublefree operation and a long service life of the heat exchanger and steam consumer is obtained. Downstream of steam boilers and steam-generating units. Between boiler and superheater. In steamlines ahead of steam manifolds. In district-heating lines and flash steam lines. Upstream of turbines, steam engines, steam tools. For direct heating with steam. In spray-vapour humidifier systems for air-conditioning plants. Technical Data Pressure rating Nominal sizes Materials St 37.0 / St 35.8 PN 16 S235JRG2 (RSt 37-2) PN 40 P265GH (H II) PN 63 DN 15 to DN 500 mm 16 Mo 3 PN Cr Mo 4-5 PN 160 V 2 A (1.4541) V 4 A (1.4571) Steam drier (separator) Desuperheater Steam drier (separator) Heat exchanger Steam generator Steam drier upstream of a heat exchanger Steam drier (separator) Heat exchangers Turbine Steam generator Steam drier downstream of a steam generator Steam generator Steam drier upstream of a turbine 148

14 Questionnaire for preparing offers for GESTRA Condensate Recovery and Return Systems GESTRA Fax: ++49 (0) Condensate flowrate Condensate temperature Condensate pressure Tank design: Cylindrical Rectangular Horizontal Vertical Condensate pumps: Qty. Discharge head Discharge control: Level electrode yes no Supply options: Accessories detached No accessories Accessories assembled and interconnected Condensate tank made of: Steel Stainless steel grade (X 6 CrNiMoTi ) Mains voltage Horizontal pump Vertical pump Submersible pump Typical Installations Open System Condensate receiver tank of cylindrical design type SD L (S) with high-pressure centrifugal pump(s) installed next to tank L = horizontal design S = vertical design Condensate tank of rectangular design type SDR A with highpressure centrifugal pump(s) installed next to tank Closed System Condensate receiver tank of cylindrical design type SD L (S) with horizontal-type centrifugal pump(s) installed next to tank L = horizontal design S = vertical design Condensate tank of rectangular design type SDR I with submersible condensate pump(s) bolted on top Name/Title C Company Name Telephone Fax Date 149