Direct Steam Injection Humidifiers
User Manual: Direct Steam Injection Humidifiers
Open the PDF directly: View PDF 
.
Page Count: 8
| Download | |
| Open PDF In Browser | View PDF |
Direct steam injection humidifiers Direct steam injection gives quality control of air humidity. Research and development in separation, the use of lightweight stainless steel combined with a constant temperature lance system, has created new standards in direct steam humidification. These features provide quality, efficiency and all round value for money. Effective moisture separation The major factors that lift the total performance of Spirax Sarco S.I. humidifiers above other manufacturers are: A highly effective combination of centrifugal, vortex and baffle separation which ensures the driest steam is available at all times. The twin chamber separator which supplies the lance and pre-heat circuit. The capability to handle high steam loads without the loss of separator efficiency. Low mass, with high strength, allows fast warm-up. The consistent condensate discharge without re-entrainment. Effective steam injection Once the separator has completed its job, it is necessary to then deliver the steam into the air as a gas, (not as a water laden atmosphere). This is achieved through the Spirax Sarco lance by: Continuous heating over the full length of the lance. Ejection nozzles which take steam from the hottest part of the lance. Low mass for rapid pre-heating. The constant re-evaporation of any condensate in the lance. The extremely small lance surface area reduces the cooling effect and air flow resistance. Why choose S.I. humidifiers? The benefits of choosing S.I. humidifiers over other manufacturers has to be the simple fact, it is an effective system which ensures: High steam output per metre of lance. Very low noise levels. Simplified duct and piping requirements. Close spacing where multiple lances are needed. Low steam ejection velocity for efficient air / steam mixing. Stainless steel separator combining centrifugal, vortex and baffle separation. S.I. steam injection humidifiers can be adapted to a wide range of duct sizes, temperatures and air velocities, with few additional components required. Alternative makes of valve and actuator can be supplied. User benefits 2 ● The cleanliness of Legionella free steam. ● Rapid moisture absorption with minimal temperature rise. ● Small, compact and lightweight for easy low cost installation. ● Wide product choice. ● Simple construction in quality stainless steel. ● Few working parts giving minimal maintenance. ● Ultra low noise levels. ● Spirax Sarco's guarantee of worldwide technical support, knowledge and service. Option of either pneumatic or electric actuators Steam injection nozzles Spring clips Air flow Internal lance heating system Section through lance showing heating system Stainless steel steam injection nozzles facing into air flow for rapid absorption of moisture. All stainless steel lance. Separate internal stainless steel lance heating system. Option of screwed or flanged valves in stainless steel, SG iron, bronze or other materials. Balanced pressure steam trap to drain lance heating circuit. Float type steam trap to drain separator. 3 Typical applications The most common application for humidification by direct steam injection occurs in air supply ducts used for control within living and office environments. The versatile Spirax Sarco S.I. humidifier can easily accommodate the wide variety of applications and installations encountered, some of which are shown below. Horizontal lance in horizontal duct* Horizontal lance in vertical duct* Vertical lance in horizontal duct Multiple horizontal lances in horizontal duct* Note: These illustrations are general with some components omitted for clarity. *Insertion of lance can be from either left or right side of ducting. 4 Product selection The best diffusion of steam into the air flow is achieved by spreading the outlet nozzles of the lance(s) evenly within the duct, vertically and horizontally. This is achieved by following the example through the five steps below. 1. The known data 2. Select the lance Select the recommended number of lances required from Table 1 to match the known duct height. Duct size 1 800 mm high and 1 800 mm wide Steam pressure 1.5 bar g Table 1 Duct height in mm Number of lances up to 1 000 1 1 000 - 1 700 2 1 700 - 2 200 3 2 200 - 2 600 4 2 600 and above 5 Number of recommended lances required = 3 Required maximum steam flowrate 110 kg / h Spirax Sarco valve Screwed Valve actuation Electric Actuator voltage 24 Vac 50 / 60 Hz Control signal VMD 3. Select the lance model Select the lance model from Table 2 to match the known duct width. Table 2 Duct width in mm Maximum Minimum 450 280 630 450 900 630 1 200 900 1 470 1 200 1 780 1 470 2 080 1 780 2 380 2 080 2 690 2 380 3 000 2 690 3 300 3 000 3 4 5 6 7 8 9 10 Lance model 1 1.5 2 Recommended lance model = 6 3 610 3 950 3 300 3 610 11 12 4. Select the system Select the system that will handle the known capacity (Type 20 or Type 40) to obtain the required valve Kv. See page 6 and the example below. Lance model 1 1.5 to 12 Kv 7 Type 20 system with multiple lances Kv 5.8 Kv 5 Kv 4 Kv 3 Kv 2 Kv 1 Supply pressure 0.25 bar g 0.5 bar g 1.0 bar g 1.5 bar g *2.0 bar g 0 0 0 0 0 6 10 15 20 22 12 20 30 40 44 18 30 45 60 66 24 40 60 80 88 30 36 50 60 75 90 100 120 110 kg / h 110 132 42 70 105 140 154 Steam load kg / h *Recommended maximum inlet steam pressure to separator for quiet operation of the humidifier. For operating pressures above 2 bar g consult Spirax Sarco. It will be seen that the Type 20 system for multiple lances requires a Kv value of 5.8 5. Select the control valve and separator Having selected the required valve Kv, the actual valve size and actuator can now be found from the chart headed Valve selection on page 7. Always select the next highest valve Kvs, to the Kv required. Recommended control valve is a DN20 LE31 with screwed BSP connections. Recommended actuator is a EL3502SE for 24 V operation VMD control signal. Final product selection and specification From the above example: 1 x Spirax Sarco S.I. humidifier for 110 kg / h at 1.5 bar g; 1 x Type 20 separator with DN20 LE31 valve screwed BSP, with EL3502SE actuator for 24 V operation VMD control signal, and 3 x Type 20 model 6 lances. 5 System sizing Lance model 1 1.5 2 3 to 12 Kv 7 Kv 6 Type 20 system with single lance Kv 5 Kv 4 Kv 3 Kv 2 Kv 1 Supply pressure 0.25 bar g 0.5 bar g 1.0 bar g 1.5 bar g *2.0 bar g 0 0 0 0 0 6 10 15 20 22 12 20 30 40 44 Lance model 1 18 30 45 60 66 24 40 60 80 88 1.5 30 50 75 100 110 36 60 90 120 132 2 3 42 70 105 140 154 4 to 12 Steam load kg / h Kv 25 Type 40 system with single lance Kv 20 Kv 15 Kv 10 Kv 5 Supply pressure 0.25 bar g 0.5 bar g 1.0 bar g 1.5 bar g *2.0 bar g 0 0 0 0 0 19 28 40 50 58 38 56 80 100 116 57 84 120 150 174 76 112 160 200 232 95 140 200 250 290 Lance model 114 168 240 300 348 1 133 196 280 350 406 1.5 to 12 Type 20 system with multiple lances Steam load kg / h Kv 7 Kv 6 Kv 5 Kv 4 Kv 3 Kv 2 Kv 1 Supply pressure 0.25 bar g 0.5 bar g 1.0 bar g 1.5 bar g *2.0 bar g 0 0 0 0 0 6 10 15 20 22 12 20 30 40 44 Lance model 18 30 45 60 66 1 24 40 60 80 88 1.5 30 50 75 100 110 36 60 90 120 132 2 42 70 105 140 154 3 to 12 Steam load kg / h Kv 25 Type 40 system with multiple lances Kv 20 Kv 15 Kv 10 Kv 5 Supply pressure 0.25 bar g 0.5 bar g 1.0 bar g 1.5 bar g *2.0 bar g 0 0 0 0 0 35 55 80 100 115 70 110 160 200 230 105 165 240 300 345 140 220 320 400 460 175 275 400 500 575 Steam load kg / h *Recommended maximum inlet steam pressure to separator for quiet operation of the humidifier. For operating pressures above 2 bar g consult Spirax Sarco. 6 Valve selection Valve selection Kvs Size 0.4 1.0 1.6 4.0 6.3 10.0 16.0 25.0 Actuator selection Cast iron DN15 DN15 DN15 DN15 DN20 DN25 DN32 DN40 Screwed Flanged LE31 LE31 LE31 LE31 LE31 LE31 LE31 LE31 LE33 LE33 LE33 LE33 LE33 LE33 LE33 LE33 Pneumatic 0.2 - 1.0 bar spring range PN3220 PN3220 PN3220 PN3220 PN3220 PN3220 PN3320 PN3420 230 Vac VMD Electric 24 V VMD EL3502SE EL3502SE EL3502SE EL3502SE EL3502SE EL3502SE EL3502SE EL3502SE EL3501SE EL3501SE EL3501SE EL3501SE EL3501SE EL3501SE EL3501SE EL3501SE 0 – 10 Vdc 24 V EL3512SE EL3512SE EL3512SE EL3512SE EL3512SE EL3512SE EL3512SE EL3512SE Note: KE valve option and EL3500 and PN5000 series actuators also available. Where positioners are required for any valve, consult Spirax Sarco. Other valves available upon request. Assembly Type20 Type40 Actuator type Pneumatic VMD 0 – 10 Vdc Lance model Screwed DN15 A Flanged Screwed DN20 A Flanged Screwed DN25 A Flanged Screwed DN32 A Flanged Screwed DN40 A Flanged C D E FØ G H JØ K L M Duct wall 213 300 192 290 340 440 330 405 340 430 270 375 DN15 B 345 375 375 DN20 B 345 375 375 DN25 B 355 385 385 DN32 B 383 390 390 DN40 B 383 390 390 270 395 85 120 208 316 105 152 40 48 165 246 38 54 60 60 M10 M10 50 min. to 80 max. Dimensions approximate in millimeters B Clearance hole required in duct to install lance JØ P N L R S N R K C M Z FØ HE G Q Y Pipe connections BSP (ISO) D A Type20 Type40 N P Q R S ¼" ¼" ½" ¾" 1" 115 65 5 17.5 115 65 5 25.5 338 138 0.88 kg 513 173 1.14 kg 688 192 1.4 kg 958 183 1.8 kg 1268 208 2.26 kg 1528 212 2.65 kg 1838 298 3.11 kg 2138 214 3.65 kg 2438 210 4.0 kg 2748 216 4.46 kg 3058 238 4.92 kg 3358 218 5.37 kg 3688 208 5.83 kg 345 137 1.54 kg 520 152 1.97 kg 695 207 2.39 kg 965 197 3.03 kg 1275 207 3.78 kg 1535 203 4.4 kg 1845 207 5.15 kg 2145 201 5.87 kg 2445 297 6.59 kg 2755 199 7.34 kg 3065 237 8.08 kg 3365 197 8.8 kg 3675 237 9.55 kg 1.46 kg 3.7 kg Separator Weight T Limiting conditions Type 20 / 40 W Escutcheon plates T V W X Assembly ¼" ¼" 1" 1½" 1½" Y Z Weight Y 1.5 Z Weight Y 2 Z Weight Y 3 Z Weight Y 4 Z Weight Y 5 Z Weight Y 6 Z Weight Y 7 Z Weight Y 8 Z Weight Y 9 Z Weight Y 10 Z Weight Y 11 Z Weight Y 12 Z Weight 1 Type20 Type40 V X W Separator body design conditions PN6 Maximum operating pressure 4 bar g Maximum operating temperature 152°C Escutcheon plates 7 Technical information 8 Assembly information Single lance 5 4 4 12 5 1 9 3 2 5 7 Q 10 13 6 Multiple lances 11 Materials Stainless steel 304 (S14 / S11)* Stainless steel 304 S11* Stainless steel BS 3146 ANC3B* Stainless steel 304L* 2 Lance Stainless steel 304L* Stainless steel 304 S11* Stainless steel 304 (S14 / S11)* 3 Nozzles Stainless steel - standard* 4 Pipe fittings Malleable iron* Bright zinc plated mild steel 5 Compression fittings Optional stainless steel 316L Spirax Sarco or 6 Pre-heat tracer pipe 8 mm O / D tube customer to supply 7 Name-plate Aluminium See specific installation and maintenance 8 Actuator instructions for model supplied LE31 and LE33 CI DIN 1691 GG20 9 Valve KE63 Stainless steel DIN 17445 4581 Tracer 10 MST21(E) Stainless steel system 11 Lance interconnecting pipework - installer to supply 12 Escutcheon plates Galvanised steel 13 FT14 drain trap SG iron DIN 1639 GGG40 * 316L Stainless steel option available 1 Separator Shell Internals Body Tracer tube Main tube End cap Spring clips Actuators can be pre-commissioned if the control signal is known. When the steam control is not part of the humidifier order, the piping components will be supplied partly assembled to the separator, for final assembly by the installer. The separator and each lance are supplied with 2 x 8 mm O / D tube compression fittings (5): 1 for the tracer supply take-off from the top of the separator, 1 each for the inlet and outlet connections for the lance heating circuit and 1 for the inlet to the tracer drain trap (10). A Spirax Sarco balanced pressure thermostatic trap (10) type ¼" MST21 (E) should be used for this application. The preheater in the lance can be supplied with steam direct from the separator at the using steam pressure as shown, or alternatively from an independent source up to a maximum of 4 bar g. The separator drain (Q) should be fitted with a Spirax Sarco float trap (with automatic air vent) to continuously discharge collected condensate. Typical specification The humidifier shall be a Spirax Sarco S.I. type of the direct steam injection design, having a stainless steel twin section separator with internal cyclonic and baffle moisture separation to provide dry saturated steam. The injection lance in stainless steel shall be steam preheated, and utilise stainless steel nozzles. The control valve shall be a Spirax Sarco 2-port valve with a spring reserve electric actuator suitable for a 24 Vac supply. Some of the products shown may not be available in certain markets. Spirax-Sarco Limited, Charlton House, Cheltenham, Gloucestershire, GL53 8ER UK. Tel: +44 (0)1242 521361 Fax: +44 (0)1242 573342 E-mail: Enquiries@SpiraxSarco.com Internet: www.SpiraxSarco.com © Copyright 2000 Spirax Sarco is a registered trademark of Spirax-Sarco Limited SB-P795-05 CH Issue 6 DIHUM 6 Where Spirax Sarco supply the steam control equipment, the separator and valve would be dispatched assembled. Alternatively, the separator, valve and actuator can be dispatched fully assembled when requested, to simplify final installation.
Source Exif Data:
File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.2 Linearized : No XMP Toolkit : 3.1-702 Create Date : 2000:07:28 15:11:34Z Modify Date : 2006:11:06 14:25:28Z Metadata Date : 2006:11:06 14:25:28Z Producer : Acrobat Distiller 4.05 for Windows Format : application/pdf Title : Direct Steam Injection Humidifiers Description : SB-P795-05 CH Issue 6 Creator : Spirax-Sarco Limited Document ID : uuid:67e50d83-081a-4c30-bf09-34999803ee73 Instance ID : uuid:85569eb1-3fde-4586-8af0-2d4a2c06b335 Page Count : 8 Subject : SB-P795-05 CH Issue 6 Author : Spirax-Sarco Limited Warning : [Minor] Ignored duplicate Info dictionaryEXIF Metadata provided by EXIF.tools