increased capacity for steam blows - SUEZ - Water ... Apr-10 increased capacity for steam blows...
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Water Technologies & Solutions case study
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increased capacity for steam blows
Figure 1: Steam Blows
Note: SUEZ purchased Ecolochem in 2005.
During the commissioning of a power station in Navarra, Spain, a temporary water treatment system was required to augment the existing water treatment system of a 400MW CCGT power station. A supplementary reverse osmosis (RO) was used, but a sudden and drastic change in feed conductivity caused the system to foul, not meeting the quality requirements, and caused the system to be shut down for several days.
With the project being delayed, the plant manager called SUEZ to furnish a system capable of delivering 12,000 gpm (2,725 m3/hr) of water with a conductivity of less than 1S, with a feed water conductivity of 1,800 S and a turbidity of 1.8 NTU, and at a very short notice to keep the timeline for the steam blows. (Figure 1)
In order to meet the requirements in quality, time and costs, the solution was to use a combination of SUEZs mobile equipment: a MobileFlow* filter trailer feeding a MobileRO*, loaded with cellulose acetate (CA)
membranes. The permeate of the RO went to a forced draft aerator (FDA) which subsequently fed, via a pump skid, a standard SUEZ MobileFlow DI trailer, which would be exchanged when exhausted, and regenerated at SUEZs service center.
Table 1: Specifications
Flow Rate 12,000 gpm (2,725 m3/hr)
Inlet Conductivity 1,800 S/cm
Outlet MobileRO 156 to 176 S/cm
Outlet MobileFlow 0.56 S/cm
The system was commissioned and operated by one of SUEZs university degreed Field Service Engineers, so it was a real hands off approach for the customer.
The filter trailer was dosed with alum, and lowered the turbidity of the water from 1.8 NTU to 0.1 NTU, in order to make it acceptable for the RO. The RO system was dosed with acid to prevent fouling of the membranes and set at 70% recovery level. It consistently obtained a 90% rejection rate: feed conductivity was 1,800 S and the permeate conductivity was between 156-176 S, as defined in the contract. The FDA was here to lower the gas levels in the permeate, which would extend the life of the MobileFlow DI, 3 trailers were then able to produce each 528,000 gpm (119,921 m3/h) of demineralized water at a conductivity of 0.056 S and a flow rate of 12,000 gpm (2,725 m3/h).
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The SUEZ water treatment system performed well within the contract requirements. The customer was very impressed with the performance of the equipment and the overall development of the project as, while relying on SUEZ expertise to provide water, no extra resources were needed, and the station steam blow went according to plan. In fact, it was so successful that the customer used our services for their next commissioning of an 800MW CCGT plant near Barcelona.
Figure 2: SUEZ patented mobile system
Figure 3: The SUEZ Solution