dhx diesel generator for sale: 一月 2016

2016年1月29日星期五

Diesel Generator Introduction

Direct current (DC) generators

An AC generator can be modified to produce direct current (DC) electricity also. This change requires a commutator. A commutator is simply a slip ring that has been cut in half, with both halves insulated from each other. The brushes attached to each half of the commutator are arranged so that at the moment the direction of the current in the coil reverses, they slip from one half of the commutator to the other. The current that flows into the external circuit, therefore, is always traveling in the same direction. This results in a steadier current.

Diesel Generator Introduction

Commercial generators. One of the most important uses of generators is the production of large amounts of electrical energy for use in industry and homes. The two most common energy sources used in operating AC generators are water and steam. Both of these energy sources have the ability to drive generators at the very high speeds at which they operate most efficiently, usually no less than 1,500 revolutions per minute.
In order to generate hydroelectric (water) power, a turbine is needed. A turbine consists of a large central shaft on which are mounted a series of fanlike vanes. As moving water strikes the vanes, it causes the central shaft to rotate. If the central shaft is then attached to a very large magnet, it causes the magnet to rotate around a central armature, generating electricity.
Steam power is commonly used to run electrical generating plants. Coal, oil, or natural gas is burned—or the energy from a nuclear reactor is harnessed—to boil water to create steam. The steam is then used to drive a turbine which, in turn, spins a generator.

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Diesel Generator Introduction

Alternating current (AC) generators

A magnet creates magnetic lines of force on either side of it that move in opposite directions. As the metal coil passes through the magnetic field

in a generator, the electrical power that is produced constantly changes. At first, the generated electric current moves in one direction (as from left to right). Then, when the coil reaches a position where it is parallel to the magnetic lines of force, no current at all is produced. As the coil continues to rotate, it cuts through magnetic lines of force in the opposite direction, and the electrical current generated travels in the opposite direction (as from right to left). The ends of the coil are attached to metal slip rings that collect the electrical current. Each slip ring, in turn, is attached to a metal brush, which transfers the current to an external circuit.

Thus, a spinning coil in a fixed magnetic field will produce an alternating current, one that travels first in one direction and then in the opposite. The rate at which the current switches back and forth is known as its frequency. Ordinary household current alternates at a frequency of 60 times per second (or 60 hertz).

The efficiency of an AC generator can be increased by substituting an armature for the wire coil. An armature consists of a cylinder-shaped iron core with a long piece of wire wrapped around it. The longer the piece of wire, the greater the electrical current that can be generated by the armature.

Diesel Generator Introduction

Words to Know

Alternating current (AC): Electric current in which the direction of flow changes back and forth rapidly and at a regular rate.

Armature: A part of a generator consisting of an iron core around which is wrapped a wire.

Commutator: A slip ring that serves to reverse the direction in which an electrical current flows in a generator.

Direct current (DC): Electrical current that always flows in the same direction.

Electromagnetic induction: The production of an electromotive force (something that moves electricity) in a closed electrical circuit as a result of a changing magnetic field.

Slip ring: The device in a generator that provides a connection between the armature and the external circuit.

Faraday also discovered that it makes no difference whether the coil rotates within the magnetic field or the magnetic field rotates around the coil. The important factor is that the wire and the magnetic field are in motion in relation to each other. In general, most AC generators have a stationary (fixed) magnetic field and a rotating coil, while most DC generators have a stationary coil and a rotating magnetic field.

Diesel Generator Introduction

Generator

A generator is a machine that converts mechanical energy into electrical energy. Generators can be subdivided into two major categories depending on whether the electric current produced is alternating current (AC) or direct current (DC). The basic principle on which both types of generators work is the same, although the details of construction of the two may differ somewhat.

Principle of operation

In 1820, Danish physicist Hans Christian Oersted (1777–1851) discovered that an electric current created a magnetic field around it. French physicist André Marie Amperè (1775–1836) then found that a coil of wire with current running through it behaved just like a magnet.

In about 1831, English physicist Michael Faraday (1791–1867) discovered the scientific principle on which generators operate: electromagnetic induction. By reversing the work of Oersted and extending the work of Amperè, Faraday reasoned that if a current running through a coiled wire could produce a magnetic field, then a magnetic field could induce (generate) a current of electricity in a coil of wire. By moving a magnet back and forth in or near a coil of wire, he created an electrical current without any other source of voltage feeding the wire.

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Diesel Generator Introduction

Despite the low power diesel generator, but because of its small size, flexible, lightweight, fully furnished, ease of operation and maintenance, it is widely used in mining, railways, field site, road traffic maintenance, as well as factories, businesses, hospitals and other departments as a backup power supply or temporary power. In recent years, the development of new unmanned automatic emergency power plants, more expanded use of this type of turbine.

At present, China has the ability to export production plant in Tianjin has more than 10 power plants and other equipment. Products are exported to Europe, Asia and Africa, dozens of countries and regions, well received.

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Diesel Generator Introduction

Diesel generator sets

1 Overview

Diesel generator set is a small power generation equipment, means the diesel fuel in the diesel engine prime mover driven generator to power machinery. Usually by the diesel engine diesel generator sets, generators, control box, fuel tank, starting and controlling the storage battery, protective equipment, emergency cabinet and other components. The whole can be fixed on the basis of positioning, also mounted on a trailer, for mobile use.

Diesel generator set is a non-continuous operation of power generation equipment, if the continuous operation of more than 12h, the output power will be lower than the rated power of about 90%.

Diesel Generator Introduction

04.

Some knowledge of diesel generator sets

The concept of diesel generator sets and test methods

One type of diesel generator sets belong captive power AC-powered devices, it is a small independent power generation equipment, internal combustion engine powered, driven synchronous AC generator and produce electricity.

Modern diesel generator set by the diesel engine, three-phase AC brushless synchronous generator, control box (screen), cooling water tank, couplings, fuel tank, muffler and public base and other components of the overall steel. Flywheel housing and the front cover of the generator using a diesel engine axial positioning shoulder formed integrally directly connected, and the use of the flexible coupling rotating cylindrical flywheel direct drive generator, which are secured together by a screw connection mode, so that the two who join into a steel body, to ensure that within the scope of concentricity diesel crankshaft and generator rotor prescribed.

Diesel generator set is a combination of an internal combustion engine and the synchronous generator from the maximum power is limited by the internal combustion engine parts mechanical load and thermal load, the rated power is called rated power, AC synchronous generator is under the rated speed, Long-term continuous operation, the rated output power, usually diesel engine rated power output between synchronous AC generator with rated power output, called matching ratio.

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Diesel Generator Introduction

(1) if there is a gap between the environmental conditions and the conditions for the calibration of diesel generator sets, the temperature, humidity and altitude values should be indicated in the contract, in order to provide the appropriate models and supporting equipment;

(2) the cooling methods adopted in the use, especially the large capacity units, should pay more attention to;

(3) in order to order, in addition to the unit model, but also to explain the choice of models;

(4) the voltage regulation rate of the diesel generator set is 1%, 2% and 2.5% respectively. Choose what, also should explain;

(5) to provide a certain amount of vulnerable parts when the normal supply is supplied, and the need for a certain amount of time.

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Diesel Generator Introduction

2 categories and specifications

Diesel generating units are classified according to the size of the output power of the generator, and the unit energy is varied from 10kW-750kW to a variety of specifications. Each specification is divided into protection type (equipped with super speed, high water temperature, low oil pressure protection device), emergency type and mobile power station type of structure. The mobile power station is divided into speed can be matched with the car speed of high-speed off-road and has a low speed of ordinary mobile.

3 order matters needing attention

The export inspection of diesel generating set is based on the technical or economic indicators of the contract requirements or technical agreement, and the user should pay attention to the following points when selecting and signing the contract:

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Diesel Generator Introduction

Diesel generator set is a non continuous operation of power generation equipment, if the continuous operation of more than 12h, its output power will be less than the rated power of about 90%.

Despite the relatively low power of diesel generator sets, but because of its small size, flexible, lightweight, fully furnished, ease of operation and maintenance. Therefore it is widely used in mines, railways, field sites, road traffic maintenance, as well as the factories, enterprises, hospitals and other departments, as a backup power source or a temporary power supply. In recent years, the newly developed unmanned automatic emergency power station, more expanded the scope of the use of the power generation unit.

At present, our country has the export production capacity of the production plant has Tianjin power plant, such as more than 10. Products are exported to Europe and Asia than dozens of countries and regions, by the praise.

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Diesel Generator Introduction

Diesel generating set is composed of internal combustion engine and synchronous generator, maximum power of internal combustion engine by parts of the mechanical load and thermal load limit, known as the rated power and rated power of AC synchronous generator is refers to under the rated speed, long continuous operation, the rated output power, usually the diesel engine rated power output and AC synchronous generator output power rating, called matching ratio.

Diesel generator set

1 Overview

Diesel generator set is a small power generation equipment, the system refers to the diesel and other fuels, diesel engine as the prime mover to drive the power generation of power machinery. Diesel generator sets are generally composed of diesel engine, generator, control box, fuel tank, starting and control storage battery, protection device, emergency cabinet and other components. The whole can be fixed on the basis of positioning, can be installed in the trailer, for mobile use.

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Diesel Generator Introduction

Some knowledge of diesel generating sets

The concept of diesel generating set and its inspection methods

The diesel generator group is a type of self owned power station AC power supply equipment, is a small independent power generation equipment, with an internal combustion engine as power, driving synchronous AC generator and power generation.

The modern diesel generating set is composed of a diesel engine, a three phase AC brushless synchronous generator, a control box (screen), a heat radiation water tank, a coupling, a fuel tank, a muffler and a common base. Diesel engine flywheel shell and the generator front end cover in the axial direction of the convex shoulder is positioned directly connected together, and the use of cylindrical elastic coupling from the flywheel direct drive generator rotating, the way of connection by screws fixed together, so that the two are connected into a steel body, ensure the diesel engine crankshaft and generator rotor concentric degree within the scope of the provisions.

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2016年1月21日星期四

The basis for the purchase of diesel generator sets

V. Order of diesel generator sets requirements

After make the selections above, order diesel generator sets should generally indicate the following:

References (1) unit, rated power, rated frequency, rated voltage, rated current, phase, power factor and wiring methods.

(2) on the unit automation and performance requirements.

(3) diesel engine, generator and control panel configuration, performance, installation size requirements.

(4) requirements for units operating in parallel: while purchase more than one unit, if the requirements of parallel conduct, such as the need for parallel conduct, but also put forward the need to provide the required measuring instruments and devices in parallel.

Ancillary equipment (5) of the unit requirements: Many domestic manufacturers of the cooling water tank (radiator), fuel tank, exhaust mufflers, batteries, also regarded as ancillary equipment to allow the installation of the proposed requirements when ordering some

The basis for the purchase of diesel generator sets

3. Common diesel generator set speed determined

In order to reduce wear and increase the service life of the unit, should use common turbines rated speed of not more than 1000r / min, the low-speed unit, its optional standby unit, the high-speed unit. The same power plant units should use the same model, with the capacity of the unit in order to use the same spare parts, easy maintenance and management. Load changes of project, you can use the same series of units of different capacities. Generator output voltage to determine the calibration and emergency generators same, usually 400V, individual electricity capacity, transmission distance of high pressure turbine engineering can be used.

4. Common control diesel generator set

Common Units should generally be considered capable of parallel conduct to simplify power distribution main wiring, the unit start, stop rotation running through and cars, load transfer, switching power supply unit without interruption. Units should be fitted with measurement and control devices of the unit, the governor and excitation unit adjusting device shall be carried out in parallel with the applicable requirements of fish. Important load power supply standby generator sets, diesel generator sets should use automated external power failure after power failure, can quickly start automatically restore power to the important load. Engine running room noisy, automation unit to facilitate the transformation of the compartment, automatic monitoring of generator sets. When the generator set normally, the operator does not have to enter the diesel engine room, the control room can be monitored on the diesel generator.

The basis for the purchase of diesel generator sets

1. Common diesel generator capacity determination

Long-term continuous operation by the unit output power can meet the whole project maximum calculated load selection, and shall determine the turbine spare capacity of the units based on the importance of the load. Output power diesel ongoing, typically 0.9 times the rated power.

2. Commonly used to determine the number of units of diesel generator sets

Common diesel generator set number of units is usually two or more, in order to ensure continuity of supply and adapt to changes in the electricity load curve. Units Number of units more, it can determine the number of units generating units were put under electricity load changes, so that the diesel engine is often running in the economic load, in order to reduce fuel consumption, reduce the cost of electricity. The best economic state of the diesel engine is running at between 75% -90% of rated power. To ensure continuity of supply, common unit itself should consider setting up reserve units, when the unit troubleshooting, or stop to check, so that generators are still able to meet the electricity load for important continued uninterrupted power supply.

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