應(yīng)急柴油發(fā)電機一般宜選用高速、增壓、油耗低、同容量的柴油發(fā)電機組。高速增壓柴油機單機容量較大,占據(jù)空間小;柴油機選用配電子或液壓調(diào)速裝置,調(diào)速性能較好;發(fā)電機宜選用配無刷勵磁或相復(fù)勵裝置的同步電機,進行較可靠,故障率低,維護檢修較方便;當(dāng)-級負(fù)荷中單臺空調(diào)器容量或電動機容量較大時,宜選用三次諧波勵磁的發(fā)電機組;機組裝在附有減震器的共用底盤上;排煙管出口宜裝設(shè)消聲器,以減小噪聲對周圍環(huán)境的影響。
Generally, the diesel generator set with high speed, pressurization, low fuel consumption and the same capacity should be selected for emergency diesel generator. High speed turbocharged diesel engine has large capacity and small space; The diesel engine is equipped with electronic or hydraulic speed regulation device, with good speed regulation performance; The synchronous motor equipped with brushless excitation or phase compound excitation device should be selected for the generator, which has reliable operation, low failure rate and convenient maintenance; When the capacity of single air conditioner or motor is large in class - load, the generator set with third harmonic excitation should be selected; The machine is assembled on a common chassis with shock absorbers; A muffler should be installed at the outlet of the smoke exhaust pipe to reduce the impact of noise on the surrounding environment.
(1)容量的確定:應(yīng)急柴油發(fā)電機組作應(yīng)急用,經(jīng)常處于待機應(yīng)急起動狀態(tài),連續(xù)運行的時間不長,一般不超過8h,因此可按“備用功率”來確定容量。按負(fù)荷的容量之和(不計備用容量),考慮經(jīng)修正后的機組容量,并能滿足-級負(fù)荷中大一臺電動機的起動要求,據(jù)此以確定應(yīng)急柴油發(fā)電機組的容量。應(yīng)急發(fā)電機一般選用三相交流同步發(fā)電機,其標(biāo)定輸出電壓為400V。
(1) Determination of capacity: the emergency diesel generator set is in emergency use, often in standby emergency start state, and the continuous operation time is not long, generally not more than 8h. Therefore, the capacity can be determined according to "standby power". According to the sum of load capacity (excluding standby capacity), consider the corrected unit capacity and meet the starting requirements of the larger motor in class - load, so as to determine the capacity of emergency diesel generator set. Three phase AC synchronous generator is generally selected for emergency generator, and its rated output voltage is 400V.
(2)臺數(shù)的確定:一般選用1臺自動化、轉(zhuǎn)速1000~1500轉(zhuǎn)/分、無刷勵磁、400/230V、三相四線帶控制屏、充放電設(shè)備及共用底盤的發(fā)電機組??梢蠊灿玫妆P帶日用油箱,以減少管路和占用面積。另外從可靠性考慮也可以選用2臺機組并聯(lián)進行供電。供應(yīng)急用的發(fā)電機組臺數(shù)一般不宜超過3臺。當(dāng)選用多臺機組時,機組應(yīng)盡量選用型號、容量相同,調(diào)壓、調(diào)速特性相近的成套設(shè)備,所用燃油性質(zhì)應(yīng)一致,以便進行維修保養(yǎng)及共用備件。
(2) Determination of the number of units: generally, one generator set with automation, rotating speed of 1000 ~ 1500 rpm, brushless excitation, 400 / 230V, three-phase four wire with control panel, charging and discharging equipment and common chassis is selected. Common chassis with daily oil tank can be required to reduce pipeline and occupied area. In addition, in consideration of reliability, two units can also be selected for parallel power supply. Generally, the number of generator units for emergency use should not exceed 3. When multiple units are selected, complete sets of equipment with the same model and capacity and similar pressure regulation and speed regulation characteristics shall be selected as far as possible, and the properties of fuel used shall be consistent for maintenance and sharing of spare parts.
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