Diesel powered generators are widely seen as the most reliable form of backup power. They are usually used in the event of problems with the grid.
From a mechanical perspective a diesel generator from well-respected brands such as Perkins, Cummins, Volvoor John Deere can run for thousands of hours without the likelihood of breakdown or the need for an overhaul. However, as we have discussed in previous blogs (cf “Check your diesel generator’s fuel” and “Basic diesel generator maintenance“) no gen set can provide long-term power security if it’s not maintained. According to the electrical engineering magazine, Electrical Construction & Maintenance (EC&M) the top 3 reasons why standby generators fail to automatically start are related to maintenance issues. The start switch was left at Off rather than Auto. Problems with starter batteries. Fuel filter clogging – usually from old or water-contaminated fuel. Ways to Maintain your Diesel Generator Our recommendations for core maintenance checks (that don’t necessarily need an engineer call out) are as follows: Regular generator starts to check for faults and identify issues like dead batteries. Check and change fuel and oil filters if there is any sign of fluid degradation. Check fuel quality and add algae inhibitors if there is any sign of moisture. Keep in contact with suppliers to make sure if planned fuel deliveries or maintenance visits are in their schedules.
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What is a Diesel Generator? A diesel generator is the combination of a diesel engine with an electric generator (often an alternator) to generate electrical energy. A diesel compression-ignition engine is designed to run on fuel oil, but some types are adapted for other liquid fuels or natural gas. Diesel generators are used in places without connection to a mains electricity supply, or as an emergency power-supply if the grid fails. How do Diesel Generators Work? A diesel generator converts diesel fuel into electricity. The diesel engine burns diesel fuel in order to produce motion for the generator, which converts the motion into electricity by using electromagnets. Though a number of fuels can be used to power similar engines, diesel is generally preferred for generators because of its ability to burn but not explode. The fuel tank of the diesel engine is filled, and the engine is started. A throttle and governor are used to keep the speed of the diesel engine consistent in order to control the power output of the generator while also preventing damage to components that could be caused by the engine operating at too high a speed. As the diesel engine turns the crankshaft that connects to the generator, the central axle of the generator is spun within a chamber containing electromagnets. This high-speed motion causes an electric current to be produced, which is then available for use by any equipment that is plugged in to the diesel generator. What is an Acoustic Enclosure? Generators are large, noisy and potentially dangerous, so where they are sited and how they are protected demands special care. Acoustic enclosures protect the machinery and those who work with it from noise, vibration and the risk of fire. They also offer protection from the weather as well as provide security, safe access and ventilation. Where can Diesel Generators be Used? Portable Generators are usually used for residential purposes to power a few domestic appliances during a power failure or at construction sites that have no source of electrical power required to operate tools. Commercial Standby / Industrial Generators are used in commercial facilities such as hospitals, offices, manufacturing plants, mining operations, nursing homes, emergency services and data centres. Anywhere that cannot risk its ability to function being discontinued, due to a power failure, usually has a generator in case of such circumstances. What is a Diesel Engine? The diesel engine is a type of internal combustion engine, a compression ignition engine. The fuel in a diesel engine is ignited by suddenly exposing it to the high temperature and pressure of a compressed gas containing oxygen (usually atmospheric air), rather than a separate source of ignition energy (such as a spark plug). This process is known as the diesel cycle after Rudolf Diesel, who invented it in 1892. Types of Diesel Engines There are two classes of diesel engines: two-stroke and four-stroke. Most diesel engines generally use the four-stroke cycle, with some larger engines operating on the two-stroke cycle. What is the difference between kW and kVA? kW – kilowatt kVA – kilovolt – ampere The main difference between these two measurements is the power factor. kW is real power, while kVA is apparent power (real power + reactive power). The power factor is typically 0.8, however it can range from 0 to 1. The kVA will value will always be higher than the kW because it includes the reactive power. Other than the US and a small number of other countries who use kW, the rest of the world tend to use kVA as the primary value, when referring to generators. The kW unit rating is the power output a generator can supply based on the horsepower of an engine. Horsepower is a unit of measure of power (the rate at which work is done) equal to 550 foot-pounds per second. This is equivalent to 745.7 watts. For example 1 horsepower = 745.7 watts, therefore a 500 horsepower engine has a kW rating of 372,850. What is a power factor? The power factor (pf) is defined as the ratio between real power (kW) and apparent power (kVA). 0.8 (pf) x 1500kVA = 1200kW The standard power factor for a three phase generator is 0.8. The pf found on the ID place of a generator relates the kVA to the kW rating. Bearing in mind that power factors are anything between 0 and 1, generators with a higher power factor are more efficient in transferring energy to the connected load, whereas generators with a lower power factor are not as efficient and result in increased power/fuel costs. If you have purchasing plan of diesel generator set, welcome to call us by phone +8613481024441 or email [email protected]. 2.2.1 Combined Heat and Power There are over 2,000 active reciprocating engine combined heat and power (CHP) installations in the U.S. providing nearly 2.3 gigawatts (GW) of power capacity. These systems are predominantly spark ignition engines fueled by natural gas and other gaseous fuels (biogas, landfill gas). Natural gas is lower in cost than petroleum based fuels and emissions control is generally more effective using gaseous fuels. Reciprocating engine CHP systems are commonly used in universities, hospitals, water treatment facilities, industrial facilities, and commercial and residential buildings. Facility capacities range from 30 kW to 30 MW, with many larger facilities comprised of multiple units. Spark ignited engines fueled by natural gas or other gaseous fuels represent 84 percent of the installed reciprocating engine CHP capacity. Thermal loads most amenable to engine-driven CHP systems in commercial/institutional buildings are space heating and hot water requirements. The simplest thermal load to supply is hot water. The primary applications for CHP in the commercial/institutional and residential sectors are those building types with relatively high and coincident electric and hot water demand such as colleges and universities, hospitals and nursing homes, multifamily residential buildings, and lodging. If space heating needs are incorporated, office buildings, and certain warehousing and mercantile/service applications can be economical applications for CHP. Technology development efforts targeted at heat activated cooling/refrigeration and thermally regenerated desiccants expand the application of engine-driven CHP by increasing the thermal energy loads in certain building types. Use of CHP thermal output for absorption cooling and/or desiccant dehumidification could increase the size and improve the economics of CHP systems in already strong CHP markets such as schools, multifamily residential buildings, lodging, nursing homes and hospitals. Use of these advanced technologies in other sectors such as restaurants, supermarkets and refrigerated warehouses provides a base thermal load that opens these sectors to CHP application. Reciprocating engine CHP systems usually meet customer thermal and electric needs as in the two hypothetical examples below: • A typical commercial application for reciprocating engine CHP is a hospital or health care facility with a 1 MW CHP system comprised of multiple 200 to 300 kW natural gas engine. Catalog of CHP Technologies 2–2 Reciprocating IC Engines system is designed to satisfy the baseload electric needs of the facility. Approximately 1.6 MW of thermal energy (MWth), in the form of hot water, is recovered from engine exhaust and engine cooling systems to provide space heating and domestic hot water to the facility as well as to drive absorption chillers for space conditioning during summer months. Overall efficiency of this type of CHP system can exceed 70 percent. • A typical industrial application for engine CHP would be a food processing plant with a 2 MW natural gas engine-driven CHP system comprised of multiple 500 to 800 kW engine gensets. The system provides baseload power to the facility and approximately 2.2 MWth low pressure steam for process heating and washdown. Overall efficiency for a CHP system of this type approaches 75 percent. 2.2.2 Emergency/Standby Generators Reciprocating engine emergency/standby generators are used in a wide variety of settings from residential homes to hospitals, scientific laboratories, data centers, telecommunication equipment, and modern naval ships. Residential systems include portable gasoline fueled spark-ignition engines or permanent installations fueled by natural gas or propane. Commercial and industrial systems more typically use diesel engines. The advantages of diesel engines in standby applications include low upfront cost, ability to store on-site fuel if required for emergency applications, and rapid start-up and ramping to full load. Because of their relatively high emissions of air pollutants, such diesel systems are generally limited in the number of hours they can operate. These systems may also be restricted by permit from providing any other services such as peak-shaving. 2.2.3 Peak Shaving Engine generators can supply power during utility peak load periods thereby providing benefits to both the end user and the local utility company. The facility can save on peak power charges and the utility can optimize operations and minimize investments in generation, transmission, and distribution that are used only 0-200 hours/year. In a typical utility peak shaving program, a utility will ask a facility to run its on-site generator during the utility’s peak load period, and in exchange, the utility will provide the facility with monthly payments. Starlight Power is a diesel generator set manufacturer in Jiangsu China, producing 20kw-2200kw diesel power generators with high quality, welcome to contact us by email [email protected], we will work with you. |
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dieselgenerator 存档
July 2022
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