Accessories and periphery
High-quality components for your individual supply concept
With clever holistic solutions 2G taps into various areas of application for combined heat and power that are much more diverse than the production of heat and electricity. Besides our experience from a wide range of projects, the high-quality of technical components is key to this diversity.
Partner of renewable energies
Combined heat and power systems can provide stabilising energy production capacities to compensate for the fluctuating electricity production of wind and solar power systems: They reliably produce heat and electricity whenever they are needed - even when it is dark and no wind blows.
If a 2G CHP participates in the balancing energy market, it only produces electricity when it is needed. In addition, the electrical energy can also be fed into the national grid providing the operator with additional revenue.
2G systems are increasingly operated according to the demand - without ever having to shut down the CHP. The zero feed-in mode of operation, for example, controls that only as much electricity as the consumer requires is produced and none is fed into the public grid.
In the context of sector coupling, combining the locally produced energy of a CHP with heat pumps can notably increase efficiency, for example, by feeding the additional thermal energy into the district heating network or by using the CHP's waste heat.
By using an air-to-air heat exchanger, air can be heated instead of water. This, in turn, enables the use of the occurring waste heat - and therefore increases the efficiency of your CHP.
The efficiency can be increased even further by a heat exchanger that makes use of the calorific value: A second exhaust gas heat exchanger is installed downstream of the first EGHE - or the latter is directly configured to exploit the calorific value.
By means of a heat distribution manifold, multiple consumers can be supplied with the heat of one combined heat and power system. The operation of the CHP is rendered independent of the heating demand by installing a buffer tank which pays off on the balancing energy market among other things.
Micro gas networks enable a spatial separation of biogas production and consumption. A pipeline transports the gas produced in a biogas plant to a second CHP which is located in immediate proximity to the property to be supplied. This so-called satellite CHP ultimately transforms the gas into usable energy.
If a grid starting device is used instead of a starter battery, the 2G CHP can be started having less of an impact on the environment, less need for maintenance and better overall startup behavior because a higher startup speed can be reached this way. Especially in colder climates this ensures a safe engine startup.
With the appropriate equipment, a combined heat and power system by 2G can supply a vast range of temperatures - flexible, efficient, and demand-oriented.
Some applications require cold instead of heat. This is the case in data centers and hospitals, for example. Connecting an absorption refrigerating system to a CHP enables the highly efficient and cost-effective provision of air-conditioning and refrigeration.
Combined with a steam generator, a CHP by 2G produces energy in the form of steam, which is needed in the food industry, for example. Steam is produced using the exhaust gas waste heat of the CHP to heat water above its boiling point so that it evaporates.
Hot water systems are particularly advantageous in case of elevated heat demands occurring in the industrial sector in the form of process heat or in district heating networks, for example. Elevated temperature levels are reached due to an increased system pressure.
Temperatures up to 350 °C can be extracted with thermal oil as the heat transfer agent. In biogas processing systems, for example, a corresponding heat exchanger is installed instead of the standard heat exchanger and provides a solid cost-benefit ratio.
Independence of the public grid
A combined heat and power system produces decentralised energy and, therefore, it can replace the supply through the public grid in case of interruptions or outages.
Thanks to the capacity to operate in island mode, a CHP by 2G - or multiple of them combined - can quickly jump into the breach and continue to ensure the electricity supply in case of interruptions or blackouts of the public grid.
The gas quality is a key factor to improve the operation of a CHP. Therefore, 2G developed a panoply of technical solutions that help maintaining a constantly high gas quality.
The gas blending system developed by 2G makes it possible to operate CHP fueled by lean gases at continuously high load. This is possible, because lean gases from sewage treatment stations or landfills can be enriched with up to 100% natural gas to guarantee stable energy supply even if the availability of gas is unstable.
Further treatment of the gas produced in the fermenter is a logical measure to sustainably prolong the service life of biogas CHP. This way, damaging impurities such as hydrogen sulfides and the residual humidity are eliminated, which means less strain on the components of the CHP.
For biogas to be utilised in combined heat and power systems, an appropriate gas pressure must be established. A gas booster upstream of the CHP adjusts the supply pressure according to requirements.
Exhaust gas post-treatment
The operation of a CHP produces exhaust gases. By integrating the technology of catalytic conversion into 2G systems, the pollutants that still have a minimal presence in the exhaust gas can be removed and relevant directives can be reliably complied with.
To reduce the emission of carbon monoxide and formaldehyde, an oxidation catalyst is built into the exhaust tracts of 2G systems. There, a chemical reaction converts unwanted substances into harmless substances. The catalysts are configured according to the specifically required target values to ensure that regulations are always fulfilled.
The installation of an SCR catalyst becomes inevitable to fulfill certain requirements regarding the reduction of nitrogen oxide emissions. During the selective catalytic reaction (SCR), the nitrogen oxides are rendered harmless through the admixture of a urea mixture which means that even the strictest exhaust gas requirements are fulfilled.
The exhaust gas also contains tiny amounts of hydrocarbons that can be eliminated by an exhaust gas combustion system. Depending on its configuration, these systems can be operated autothermally in stationary applications, meaning that no additional fuel input is required.
Bus systems are used to create interfaces between the CHP by 2G and the customer's system to facilitate the exchange of digital and analog data and signals. The data can, for example, be processed by a customer-specific control unit to create a visualization or to forward status messages and monitor the system based on the data.