10000 SERIES. Steam Desuperheater With Spray Nozzles
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1 10000 SERIES Steam Desuperheater With Spray Nozzles
2 Engineering Data General The desuperheaters Series provide the right technical solution to reduce steam temperature when large spray water flows are required. The superheated steam flows through a pipe section where one or more spray nozzles are fitted. The nozzles atomize the water producing small droplets that quickly evaporate thanks to the heat transferred by the superheated steam. This heat transfer allows to reduce the steam temperature. RTD - RING TYPE DESUPERHEATER Fig.1. RTD model Technical Data Connection (Spray water side): Flanged RF for ANSI Flanged RTJ for ANSI Butt welding ends Nozzle Sizes: Nozzle type Number of nozzles * Cv value OP OP14 n n OP OP20 n 2 n OP OP28 n 5 n OP ,4 OP40 n (10,4) n * n depends on the working conditions
3 Characteristic: See Fig. 2 Flow control: Materials: Separate spray water control valve With reference to the Fig. 3 the materials used are those indicated in Tab.1 Fig Fig.3. Typical RTD model with Nozzle Detail 9 15
4 ITEM PART MATERIALS 1 STUDS ASTM A193 B7; ASTM A193 B16 2 NUTS ASTM A194 2H 3 FLANGE ASTM A182 F91; ASTM A105 4 GASKET GRAPHOIL 5 CAGE ASTM A565 Type BODY ASTM A182 F91; ASTM A105 7 GASKET GRAPHOIL 8 SPRAY WATER PIPE 9 SHAFT ASTM A106; ASTM A335 P11 ASTM A335 P22 10 NOZZLE 11 SPRING INCONEL X750; NiCr15Fe7TiAL 12 TENSION SLEEVE 13 RIVET 316 SS; X6CrMoTi GASKET GRAPHITE Tab. 1 Materials Rangeability Nozzle turndown: 20:1 Spray water control valve turn down: - Standard: 40:1 Differential pressure Water/Steam: Distance between desuperheater and temperature sensor: - Min 2 bar - Max 15 bar It is established by means of a calculation of the size of water droplets and their coalescent time before vaporization. This method depends on: Steam and water thermodynamic conditions Nozzle and desuperheater design
5 Typical dimension *: Nominal Pipe Diameter L B mm / inch mm mm 200/ / / / / / / / / / / / / / Tab.2 RTD Dimensions * The dimensions are typical. The length depends on the number of nozzles. Maximum spray water quantity: Liner: Cooling water filter: From 20% up to 33% of the steam flow. It depends on: - the number of nozzles - the number of injection sections (one or two) it is installed to improve the system turndown or to protect the steam line (Fig. 4) it is advisable to use a filter Mesh 100 (100 holes/sq. inch with a diameter of 0.15 mm) to avoid spray nozzles obstruction Fig.4.
6 PTD - PROBE TYPE DESUPERHEATER Technical Data Fig.5. PTD model Connection: Spray water side: Flanged RF for ANSI Flanged RTJ for ANSI Butt welding ends. Steam side: Flanged RF for ANSI Flanged RTJ for ANSI Nozzle Sizes: Nozzle Number of nozzles Cv OP14 * 1 1 l OP OP OP OP OP OP ,4 OP ,8 Characteristic: See Fig. 2 Flow control: Materials: Separate spray water control valve with reference to the Fig. 6 the materials used are those indicated in Tab. 3
7 ORIENTATION HOLE Fig.6. Typical PTD model with Nozzle Detail ITEM PART MATERIALS 9 SHAFT 10 NOZZLE 11 SPRING INCONEL X750 NiCr15Fe7TiAL 12 TENSION SLEEVE 13 RIVET 316 SS; X6CrMoTi GASKET GRAPHITE 16 STUDS ASTM A479; XM19 ASTM A193 B7; ASTM A193 B16 17 NUTS ASTM A479 XM19; ASTM A194 2H 18 FLANGE ASTM A182 F91; ASTM A COUNTERFLANGE ASTM A182 F91; ASTM A GASKET 304 SS; GRAPHOIL 21 BODY Tab.3 Materials ASTM A105; ASTM A182 F91 Rangeability Nozzle turndown: 20:1 Spray water control valve turn down: - Standard: 40:1 Differential pressure Water/Steam: Distance between desuperheater and temperature sensor: - Min 2 bar - Max 15 bar It is established by means of a calculation of the size of water droplets and their coalescent time before vaporization. This method depends on: Steam and water thermodynamic conditions Nozzle and desuperheater design
8 DVTF - DESUPERHEATER VENTURI TYPE FLANGED ENDS Fig.7. DVTF model Technical Data Connection (Spray water side): Flanged RF for ANSI Flanged RTJ for ANSI Nozzle Sizes: Nozzle type Number of nozzles * Cv value OP OP14 n n OP OP20 n 2 n OP OP28 n 5 n OP ,4 OP40 n (10,4) n * n depends on the working conditions Characteristic: See Fig. 2 Flow control: Materials: Separate spray water control valve With reference to the Fig. 8 the materials used are those indicated in Tab. 4
9 VIEW B A SECTION A-A B A Fig.8. Typical DVTF model with Nozzle Detail ITEM PART MATERIALS 9 SHAFT 10 NOZZLE 11 SPRING INCONEL X750; NiCr15Fe7TiAL 12 TENSION SLEEVE 13 RIVET 316 SS; X6CrMoTi GASKET GRAPHITE 21 BODY 22 VENTURI 23 PIPE 24 GLANGE Tab. 4 Materials ASTM A105; ASTM A182 F91 ASTM A105; ASTM A182 F91 ASTM A105; ASTM A182 F91 ASTM A105; ASTM A182 F91 Rangeability Nozzle turndown: 20:1 Spray water control valve turn down: - Standard: 40:1 Differential pressure Water/Steam: - Min 2 bar - Max 15 bar
10 Distance between desuperheater and temperature sensor: It is established by means of a calculation of the size of water droplets and their coalescent time before vaporization. This method depends on: Steam and water thermodynamic conditions. Nozzle and desuperheater design. Typical dimension: B C ±3 A Nominal Pipe C A B Diameter ANSI CLASS mm inch mm mm / Tab. 5 DVTF Dimensions Maximum spray water quantity: Cooling water filter: From 20% up to 33% of the steam flow. It depends on: - the number of nozzles - the number of injection sections (one or two) It is advisable to use a filter Mesh 100 (100 holes/sq. inch. with a diameter of 0.15 mm) to avoid spray nozzles obstruction
11 DVTW - DESUPERHEATER VENTURI TYPE WELDED ENDS Fig.9. DVTW model Technical Data Connection (Spray water side): Welded Ends for ANSI Nozzle Sizes: Nozzle type Number of nozzles * Cv value OP OP14 n n OP OP20 n 2 n OP OP28 n 5 n OP ,4 OP40 n (10,4) n * n depends on the working conditions Characteristic: See Fig. 2 Flow control: Materials: Separate spray water control valve With reference to the Fig. 10 the materials used are those indicated in Tab. 6
12 a 18 ORIENTATION HOLE 19 FIXED AREA NOZZLE SPRING NOZZLE - VARIABLE AREA Fig.10. Typical DVTW drawing with nozzles details ITEM PART MATERIALS 9 SHAFT 420 SS: X19CrMoNbVN11-1 X35CrMo17: X39CrMo NOZZLE 10a FIXED AREA NOZZLE 303 SS; 316L SS; BRASS 11 SPRING INCONEL X750; NiCr15Fe7TiAL 12 TENSION SLEEVE 13 RIVET 316 SS; X6CrMoTi GASKET GRAPHITE 16 STUDS ASTM A479; XM19 ASTM A193 B7; ASTM A193 B16 17 NUTS ASTM A479 XM19; ASTM A194 2H 18 FLANGE ASTM A182 F91; ASTM A COUNTERFLANGE ASTM A182 F91; ASTM A GASKET 304 SS; GRAPHOIL 21 BODY Tab. 6 Materials ASTM A105; ASTM A182 F91 Rangeability Nozzle turndown: - Spring nozzle: 20:1 - Fixed area nozzle: 10:1 Spray water control valve turn down: - Standard: 40:1
13 Differential pressure Water/Steam: Distance between desuperheater and temperature sensor: - Min 2 bar - Max 15 bar It is established by means of a calculation of the size of water droplets and their coalescent time before vaporization. This method depends on: Steam and water thermodynamic conditions Nozzle and desuperheater design Typical dimension: A The A dimensions depends upon vena contracta. Maximum spray water quantity: Cooling water filter: From 20% up to 33% of the steam flow. It depends on: - the number of nozzles - the number of injection sections (one or two) It is advisable to use a filter Mesh 100 (100 holes/sq. inch with a diameter of 0.15 mm) to avoid spray nozzles obstruction
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