Hydrogen cools well, but safety is crucial power engineering. Operation of seal oil system the seal oil is kept at a higher pressure than the gas pressure in the generator by specified differential 0. The heat absorbed by the gas is removed as it passes over. Critical fuel systems, division of bfs industries, llc.
Engineers modelled the hydrogen seal systems and used the simulated results to identify the case of their system. There are two type of generator seal oil system, scavenging type and vacuum type. A hydrogen cooled generator having a system for diagnosing problems associated with a seal oil system. Turbo gen services introduction function seals both ends of the generator shaft against hydrogen loss, as the generator. The oil that flows across the outboard ring mixes with the bearing lube oil and returns to a lube oil.
Seal oil system of generator in thermal power plant. To provide dry, superheated steam to the low pressure turbines to reduce moisture erosion and to increase plant efficiency. Much of the worlds energy is produced by turbines that. Given a simplified diagram of a typical generator hydrogen seal oil system. Us20110231111a1 turbinegenerator hydrogen seal oil. Precommissioning checks and tests, detailed tests and commissioning procedures and instructions for all electrical equipment. Lube oil systems are generally considered under the turbine auxiliary systems and thus not typically included in generator maintenance. This explain the process of working of seal oil system in generator. In this document we highlight the typical indoor components and operational requirements of modern diesel fuel or fuel oil systems.
Lubrication, seal and piping systems for turbomachinery. Range includes but is not limited to purpose, methods of generator cooling, comparison of air and hydrogen cooled generators, efficiency losses, flow paths, temperature controls. These are rounded mesh like structures kept over each other. The seal oil system may be a completely separate oil system, however in most cases it is apart of the compressor main lube oil system. The purpose of the seal oil system is to keep the compressed gas from entering the bearing assembly and escaping from the compressor to the atmosphere.
Turbine generator lubricating oil and the hydrogen seal oil must be analyzed for moisture content down to levels of 10 ppm 0. Most hydrogen cooled generator are incorporate the seal oil system, just because to avoid the contact between and air and hydrogen generally pressure of hydrogen in generator around 4bar. Elliott first began to manufacture oil consoles for its own turbomachinery nearly 80 years ago. Picture beside is from siemens generator which use scavenging system that is very easy to understanding how seal oil works. Gek 107241 shaft sealing system 7h2 and 7fh2 generators keywords. To avoid this, oil is pumped continually to the bearings of the turbine, generator, exciter and boilerfeed pumps. Hydrogen leaks occur at the generator bearings and shaft seals, in the seal oil supply system and from the hydrogen supply piping, mechanicals and puritypurging cabinet. Approval issue course 234 turbine and auxiliaries module 10 stressed that these consequences.
Steam turbinegenerator overhaul and inspection guidelines. A hydrogencooled turbo generator is a turbo generator with gaseous hydrogen as a coolant. To provide turbine generator lubricating oil and autostop oil for the turbine trip system, and 4. Engineers modelled the hydrogen seal systems and used the simulated results to identify the case of their system trips. Seal oil system of generator in thermal power plant free download as powerpoint presentation. It has three completely separate windings in which current is produced, but a single rotating magnetic field. View and download generac power systems gtv990 manual online. Controls and accessories are typically serviced in outages of short duration, whereas the other four systems are maintained through less frequent outages of longer duration. The rotating magnetic field is the rotor and the windings in which current is. Revised procedure for removal and installation of oil cooler assembly. A fixed orifice bypassed with a valve giving a variable orifice effect, is used in this line to reduce the flow to the proper amount. An engineering guide to modern fuel systems this publication is intended as a resource for designers, installers, and system operators. Within the generator, there is no electrical connection between the windings. Gain a thorough understanding of all precommissioning checks and tests, and all commissioning.
The primary maintenance effort involves five basic systems. A seal oil ring is used to avoid the contact between and ai. We also provide accessory skids for water wash, fire suppression, denox and water injection. The solution the major source of water in the turbine generator lubricating oil is water from poor steam seals on the turbine. Cryostar is able to provide simple and low cost oil lubrication system but also some optimized systems. A typical lube oil system provides oil for both the turbine and generator bearings while also serving as a source of seal oil to the generator seals. Gek 107241 shaft sealing system 7h2 and 7fh2 generators author. This five chapter course has been created to show generator construction and function. List and briefly explain six operational requirements of the generator hydrogen seal oil system. Cool, clean oil from the turbine lubricating oil system is supplied to the hydrogen seal oil system storage tank. The generator is cooled with a hydrogen gas recirculation system using fans mounted on the generator rotor shaft. Lube and seal oil systems, and steam and process gas piping require a thorough cleaning before a new machinery train can be commissioned. Ge hydrogen cooled 3d generator course overview youtube.
The oil that flows across the outboard ring mixes with the bearing lube oil and returns to a lube oil tank. Gek 107241 shaft sealing system 7h2 and 7fh2 generators created date. Page 17 turbomachinery package specification taurus 60 compressor set and mechanical drive seal gas system the seal gas system consists of a primary and secondary gas face seal to prevent the escape of process gas for each shaft end. General electric systems technology manual chapter 9.
Generator, unit hydrogen, seal oil, stator coolant, demin. Ge power systems ger4212 0801 2 ge generator rotor design, operational issues, and refurbishment options coupling coil slot retaining ring. A hermetic seal, usually a liquid seal, is employed. The three phase generator is basically three separate generators in one casing. Below is a general listing of lubrication systems and components for various caterpillar engines. Control and oil system the relation of the various elements which comprise the complete governing or control system, is shown diagramatically in figure 1. Title operate generator cooling and seal oil systems from.
The oil from the seals flows back to the turbine lube oil system for cooling and cleaning. The seal oil system prevents gas from leaking out of the compressor case. The hydrogen seal oil system pumps then supply oil to the generator seals at 8 psig above generator gas pressure. Check camshaft bearings use a telescoping gauge and caliper to check camshaft bear ings. Control and oil system lubrication system the oil supplied to the lubrication system as noted above passes through the oil cooler and thence to the main bearings, thrust bearings and turning gear. Engineers modelled the hydrogen seal systems and used the simulated results to identify the of origin their system trips. What is the next concern for the unit as it pertains to the generator and the associated seal oil system a.
State the purpose of the generator hydrogen seal oil system. Included is a shaft having a turbine end and a collector end. Vacuum values trending toward higher end of acceptable criteria. Gas is prevented from escaping at the rotor shafts by a closedloop oil seal system. These systems require auxiliary equipment such as pumps, regulators, filters, and so on for proper operation. Ger4212 ge generator rotor design, operational issues. In practice, however, cleaning these systems rarely gets the attention deserved. Telescoping install a new pto oil seal and press it in until it is 1. Cleaning seal and lube oil systems is also often required during a machinery turnaround. If mop fails ac or dc pump works and if these fail then damper pump comes into action.
A small amount of gas is allowed to be vented from the seal oil enlargement tank, where the entrained air liberated from the seal oil is hopefully contained. The oil system provides a constant supply of filtered oil to the engine. Range includes but is not limited to function of seal oil, seal construction. That system is typically called a scavenging system. Seal oil system of generator in thermal power plant pump. With the seal oil pumps in operation, the seal oil pressure is controlled by differential pressure regulating valvea dpra. Main bearings, piston cooling jets, camshafts, gear train, rocker arms, and. So, there is a system to remove the air which is liberated from the seal oil that flows into the hydrogen side of the generator seal. Typical fuel oil system layout fuel oil systems can be as simple as a single main storage tank pumping to a day tank, or they can be complex, involving several pump sets with day tanks for any number of generators located on any number of floors in a building. Turbine systems are subject to contamination from several sources and deposits will accumulate even though the oil is clean.
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