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Steam is an essential element in the energy supply system. As a primary energy source, it fulfills many important functions, whether it’s used to operate a turbine, as process steam for use in industry, or for district heating.
Therefore, heat recovery steam generators (HRSG) are important components of many power plants: They substantially increase a plant’s overall efficiency, and help to minimize the costs of fuel. You also benefit from greater flexibility when operating at part load or during load changes.
Heat Recovery Steam Generators (HRSGs)
Robust drum technology also makes it possible to use steam for basic applications, such as electricity generation or supplying heat. An innovative drum design improves flexibility and efficiency in power plant operation.
Our HRSGs from 10 MW to the largest gas turbines offer lower installation costs, less site risks, and, potentially, and earlier commercial operation for the entire plant. How do we accomplish this? Through a higher degree of standardization of pressure part modules.
Horizontal natural circulation: Cold-casing design
Designed for natural circulation of the water/steam mixture in the evaporator tubes, our horizontal HRSG uses a cold-casing design. Completely insulated and lined with sheeting, cold-casing design allows you to quickly start-up your gas turbine. Additionally, it enables you to use higher gas temperatures associated with modern gas turbines.
Vertical natural circulation: ‘Counter flow’ evaporator design
Our HRSG’s unrivaled, state-of-the-art patented 'counter flow' evaporator design offers:
- Free expansion of headers and tubes
- Readily accessible headers and bends for inspection
- Stress-free repair and maintenance
- Easy on-site construction
Waste Heat Recovery Units (WHRU)
The WHRU offers an efficient method of recovering thermal energy from the waste heat of gas turbine exhaust gases. This method allows a significant increase in the efficiency of the turbine train, and a decrease in both fuel demand and pollution. We are able to supply the entire scope for your gas turbine train, bringing the total number of parties required for project realization back to only one.
The standardized design fits every type of gas turbine, ranging from 10 to 70 MW. It is therefore in perfect harmony with, but not limited to, the existing Siemens gas turbine portfolio.
Exhaust stacks and diverter systems
Siemens is recognized globally for quality and innovation in the area of exhaust stacks and diverter systems. Where a tight shut-off or good control is required, we’re there with a variety of dampers for the power and environmental industry. Exhaust stacks and bypass systems, incorporating diverters and silencing equipment for gas turbine plants are included in our extensive product portfolio. Choose from a variety of high quality products that best meet your individual needs.
Exhaust gas bypass systems add operational flexibility, efficiency, and safety to a combined cycle power island. The heart of any bypass system is the diverter damper. Siemens’ diverter dampers combine state-of-the-art design principles and technology with empirical field data. While based on a high level of standardization, our diverters are also custom engineered to meet your specific required combustion turbine characteristics, as well as your individual requirements. Stacks, especially, are designed to your precise project specifications.
Simple cycle power plants consist of a combustion turbine and an integrated chimney or exhaust stack. Many power island projects start with a simple cycle design to minimize initial capital costs, reduce equipment installation time, and enable power generation as quickly as possible. Our design portfolio offers base mounted and elbow duct versions.
Siemens’ guillotine-type blanking plates are extensively used in exhaust gas bypass systems as a secondary shut-off device in conjunction with a diverter damper. When your combustion turbine is in operation, the damper creates a “man-safe” environment within the downstream-located HRSG. As a stand-alone solution, the guillotine damper typically utilizes a temperature-proof design with rack-and-pinion drive system and a gas-tight, fully enclosed bonnet. Almost the full cross-section of the duct is available once the guillotine blade fully retracts, resulting in a very low pressure drop.
The primary function of an HRSG stack damper is to slow down the cooling rate of your HRSG between individual gas turbine starts. During sustained shutdowns, stack dampers prevent rain from entering the HRSG. Available in standardized, parametric two-blade, or individual four-blade designs, our stack dampers can be readily retrofitted to existing HRSG stacks.
Siemens’ louver dampers are robust flow control and/or shut-off devices specifically designed for the demanding environment in combustion turbine exhaust installations. Our engineers design and build louver dampers in accordance with your plant-specific parameters and individual specifications. To ensure you have the right damper for your individual needs, we offer various designs, dimensions, and shapes—with or without duct section. Additionally, we use different construction materials based on your plant’s operating temperature and pressure, abrasive or corrosive environment, as well as other process operating conditions.
We provide a full range of spare and wear parts for your complete exhaust gas systems and damper portfolio—available for start-up and commissioning, operational and strategic purposes, as well as fulfilling long-term availability requirements. We have direct counterparts with expert knowledge and lean processes, so that we can offer both quick response times and cost-efficient solutions.
Installation: Technical advisory services support your local contractors or assembly groups. How? With our OEM expertise, we can ensure a smooth and efficient installation. Our specialists are available everywhere you are.
Commissioning: Proper installation and start-up are essential for a reliable and fault-free, long-term operation of mechanically moving equipment in severe flue gas environment conditions. Put your trust in our service expertise ensuring optimal performance during your warranty period, as well as throughout the whole service life of your installed system.
Maintenance: When considering an upgrade—whether it be a simple check or a continuous maintenance program—we offer a comprehensive selection of on-site inspection, survey, and testing services.
Service and warranty
Our high-standard of engineering and maintenance services; our in-depth know-how about the power generation process and its components: This is what operators of power plants around the globe benefit from. With more than eighty years of experience, Siemens is an OEM with the reputation for solving steam generator challenges. With us at your side, you can maximize your performance, while simultaneously lowering both costs and risks. Our engineering staff, tools, and work processes are second to none giving you the competitive edge.
Downloads, support, and services
This is where you can find material to download, contact details, and links to the services we offer.
Four heat-recovery steam generators for efficient combined cycle operation
With duct firing for even more flexible operating choices
No efficiency losses at part load or with changing loads
Natural gas combined cycle power plant of approx. 1,300 MW
Capability to be converted into an Integrated Gasification Combined Cycle (IGCC)
Designed for future operation on syngas and prepared for future addition of a boiler house
Two DrumPlus™ HRSGs offer quick response to power demand
Fast gas turbine starts lead to reduced start-up costs
Significant lower NOX emissions during start up
Four GT simple cycle exhaust gas stacks (convertible) with a stack height of 27 m (designed for extension up to 42 m)
Simple and economical design for ease of initial installation
Clean breakaway points for faster conversion to combined cycle resulting in decreased GT downtime
Three Stack Dampers for DrumPlus™ HRSGs
Stack dampers protect against rain and drainage
Overpressure relief in case of process upsets
Two louver dampers with T-box and guillotine with blind plates and bypass stack (50 meters)
Most precise flow control ability versus other damper types
Rapid blade response time when required, ideal for “flying takeover” boiler operations
Does your power plant need to provide flexible dispatch? Or do you want to be able to extract heat? In both these cases, a steam generator is essential: and we’ll find the right technology for your needs.