MSF Distillers Lifetime Kuwait experience

Transcription

1 MSF Distillers Lifetime Kuwait experience Ministry of Energy- Electricity and Water Kuwait March 2006

2 1. Seawater Desalination Progress In Kuwait: KUWAIT has population of 2.2 M people in The limited sources of fresh water and the geographical position of Kuwait forced towards the use of seawater desalination as the main sources of drinking water Kuwait has sea water desalination plant with 0.1 MIGD

3 Since desalination was started, a total of 88 distillers are installed in Kuwait with different design and different capacities. Recently there are 48 MSF seawater desalination units installed Number of MSF Distillers Year Number of MSF distillers installed in kuwait ( )

4 The MSF distiller in Kuwait pass through number of development during the five decades Including: The capacities of individual units.and others parameters / Installed Capacity per Unit MIG Year Figure (3): MSF Installed Capacity per Unit In Kuwait, MIGD/Unit

5 construction material. Such materials include: L stainless steel for flash chambers instated of carbon steal. 2. Titanium alloys instated of cupper nickel for tubes. 3.antiscalants chemicals: polymers as ploymalike, and polyphosphnic, instead of acid and Shuwaikh mix.

6 Kuwait Ministry of energy electricity and water (MOE-E&W) has spent more than US $ (2.8) Billion until Cost Million US $ Year Figure (1): Accumulated Cost of Installed Desalination Plants in Kuwait (Millions US $)

7 The MSF distiller unit in service located in five distillation plants: 1. Shuwaikh, 2. Shuaiba South, 3. Doha East, 4. Doha West, 5. Az-Zour South Distillation units in Kuwait are multi stage flash (MSF). All these station are dual purposes except Shuwaikh station. The total capacity of the distillation stations is MIGD.

8 Table (1): Distillers in service at MOE-E&W. Station Shuaiba South power generation and water desalination plant. Tech. No. Of Units Capacity (MIGD) TOTAL MSF 6 30 Doha East power generation and water desalination plant. MSF 7 42 Shuwaikh distillation plant. MSF 3 18 Doha West power generation and water desalination plant. Az-Zour south power generation and water desalination plant. MSF 16 MSF Total

9 MIGD Distillate Production 0.1MIGD Year Total Capacity For MSF Distillers In Kuwait (MIGD)

10 2. DISTILLER LIFETIME : the capital investment depreciation was calculated accordingly the lifetime. In the past, the normal lifetime of distiller is years. Recently The maximum lifetime of MSF is years. In KUWAIT the oldest unit still in service, has been over 33 years.

11 Table (2): Distillers Commission Year Station Shuaiba South power generation and water desalination plant Doha East power generation and water desalination plant Units Age (years) A1,A2,A3,A4 33 A5, A6 31 A1,A2,A3 28 A4,A5,A6,A7 27 Shuwaikh distillation plant D1,D2,D3 24 Doha West power generation and water desalination plant Az-Zour south power generation and water desalination plant D1A,D1B 23 D3A,D3B,D4A,D4B,D5A, 22 D5B,D6A,D6B,D8A 21 D7A,D7B,D8B 18 D1,D2,D3,D4,D7,D8 19 D5,D6 8 D9,D10,D11,D12 5 Running Hours

12 Shuwaikh distillation plant Unit No. Running Hours D D D Shuaiba South power generation and water desalination plant Unit No. Running Hours A A A A A A6 7744

13 Doha East power generation and water desalination plant Unit No. Running Hours A A A A A A A7 8647

14 Doha West power generation and water desalination plant Unit No. Running Hours Unit No. Running Hours D1A 6378 D1B 6640 D2A 7623 D2B 8009 D5A 8284 D5B 8354 D6A 6348 D6B 6058 D3A 5760 D7A 6582 D3B 7424 D7B 6441 D4A 7600 D8A 7961 D4B 8639 D8B 7793

15 Az-Zour South power generation and water desalination plant Unit No. Running Hours Unit No. Running Hours D D D D D D D D D D D D D D D D

16 more than 30 years 13% less than 10 years 17% years 17% years 53%

17 Maintenance included cleaning, repairing, painting, welding, rubber lining. for all part of distiller as heat exchanger tubes, water boxes, flash chambers, instruments, pipelines, pumps, compressors. Distiller maintenance is divided into two parts Programmed Maintenance and Emergency Maintenance. 3.FACTORS EXTENDED MSF DISTILLER LIFETIME: Design: Distiller design is the first step to attend very high reliability and availability for the unit. The special design features of the MSF distillation in Kuwait will meet distillers performance guarantees and it will provide adequate service during the life of the plant and allow for flexibility in operation. Operation : Good Controlling of operation parameter will adequate corrosion allowance and scale formation were higher efficiency is attaining. Feed water salinity, temperatures, production will consider on operation mode. With different conditions operation should be according to the manufacture instructions. Maintenance :

18 Case - Study 4.Shuaiba south distillation plant Rehabetation project: Shuaibia south distillation plant consist of six distillers commissioned during To extended distillers life, a Rehabetation project for all units carried out on 24 October 2005 and planed to be finished within three years. :

19 section Distiller outer shell Water boxes and brine heater Distiller internal Pipes and filters pumps ejectors Control valves Motorized valves Chemical injection system Steel structure and civil work Main item Remove all cladding and insulation, inspection, replace the roof plates and insulation, sand blast the entire external surface, apply epoxy. Replace heat rejection water boxes, inspect heat gain section WB, sand blasting for internal and external surfaces, painting, replace all tubes for brine heater and stage , (titanium for HRS & brine heater),(albrass & Cu-Ni for HGS), hydrojet clean and acid for others, replace insulation. Replace the demisters, inspection, blasting internal surfaces, replace the corroded floor and division plates where thickness reduction 25%, replace distillate trough for unit(5&6), painting. Replace seawater inlet,outlet and recirculation pipes,(stainless steel 316L), fix high performance stainless steel 316L debris filter, inspection pipes, painting, sandblasting, renew cooling water system, replace insulation. Renew all supports for lines. Redesign and modify lubricating system, replace condensate pump set, distillate pump, complete overhaul remaining pumps, civil work for foundation. Retube all ejector condensers for A1with titanium tubes. Replace the pneumatic control valves with its actuators. Replace the motorized valves with new ones. Supply & installed pumps and agitators, design fabricate supply and install two interconnected carbon steel rubber lined, replace all half inch pipes. Inspection, modify the bottom walkway structure, repair the concrete foundation

20 COMMENTS: A - Sea water desalination is the main sources of fresh water in KUWAIT B - Multi stage flash MSF in KUWAIT has developmed and greatly improved over fifty years. C - Good design, operational and maintenance run the distillers smoothly and extend their life time. D - For running units, decision need to continue run the units with modification to increase their life times and improve the effeciency, or to shut down and build new desalination plants with longer life times. E - To cover the demand for water in the future, Kuwait will have to: Continue the program of inspection and maintenance for all distillers. Construct new desalination plant. Continue water conservation programmes.

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