BELARUS NEWS AND ANALYSIS

DATE:

23/05/2007

Containerised combined heat and power plant

Siemens has received its first order for a SSC-300 combined heat and power (CHP) plant which will be supplied to Belarus, the crossroads between Eastern and Western Europe.

Customer is PJSC Grodno Azot, the largest chemical manufacturer in Belarus, and one of the largest in Europe.

The installation of the plant will enable the company to be independent of purchased electricity and to generate economically its own steam and electricity for its production facilities, covering the manufacture and export of fertilisers, chemicals and consumer goods.

The SSC-300 is a modularised small CHP plant which delivers 7.5 MW of electrical power output and 19 tons/h of steam. It is characterised by a pre-engineering concept that has introduced a high degree of standardization to the product.

This pre-engineered, standardised approach, says Siemens, leads to higher reliability and improved plant quality compared with customised solutions.

Detailed pre-planning, plus the use of proven components, reduce not only project lead times but also the overall risk for the customer, since standardisation guarantees repeatability. The compact CHP plants are specially designed to respond to urgent or peak power needs, so, in order to fulfill customer demands in the shortest time possible, they are delivered in containerised modules that can quickly and easily be assembled on-site.

The two core modules comprise the gas turbine-generator and the heat recovery steam generator (HRSG), which are completely standardised. Five auxiliary modules, assembled inside standard containers, house the necessary balance of plant. Thus the supply to Grodno Azot will cover a complete compact power plant comprising two SGT-300 gas turbines, two HRSGs, low voltage system, medium voltage system and an automatic control system.

With the present cost of fuel, industries with high power consumption are looking to reduce the cost of their process by making maximum utilisation of the heat content in the fuel. Many industries have in-house boilers to produce their own process steam, and purchase electricity from the local grid. As in the case of Grodno Azot, the installation of a SCC-300 provides such industries with economic captive power generation. The total efficiency rate for the Grodno Azot chp plant, including supplementary firing, will be as high as 90.3 per cent

Due to its efficiency, the SCC-300 optimises fuel use and payback time on the investment cost is short, less than five years. Extremely high process availabilities can be achieved, especially if existing boilers are kept for standby service to cover the heat needs during maintenance outage of the plant.

These CHP plants have very high reliability and availability factors. Because of the clean exhaust of the gas turbine operating on natural gas fuel, the life of the HRSG can be as long as 30-40 years. The gas turbine should be subjected to a major overhaul every 25,000 equivalent operating hours (EOH), corresponding to a two-week outage every three years. The design life of the gas turbine is 250,000 hours or about 25 years.

The SSC-300 is designed for outdoor application, thus requiring no building or other expensive civil works. The simple foundations required for the SSC-300 modules should be prepared before arrival of the components to site. Once the foundations are prepared and the components arrive on-site, plant assembly is done in a minimum of time. In fact, all the auxiliaries of the CHP plant are assembled inside standard containers, which need only to be connected around the two main modules.

The gas turbine-generator module is covered by noise-insulation which also protects the machinery from the environżment. Plant layout can be adapted to fit the space available on site, with tailored interconnections.

The timeframe from order to commissioning of such modularised CHP plants is in the order of one year, the longest lead time being for the gas turbine-generator module. The order from Grodno Azot was received in March 2007, and commissioning of the plant is thus scheduled for early 2008.

Source:

http://www.engineerlive.com/news/17753/containerised-combined-heat-and-power-plant.thtml

Google