Section viii. Gas power plant boilers and gas heating boilers and residual heating power plant structures
The combustion plant consists of pressurizers, internal combustion engines, generators, pipes, valves, electric generators, pumps, assistive equipment, instrumentation, spare heat boilers, wind-screen doors, sealed wind winders, boilers, gas turbines, heaters, aerobics and corresponding support equipment, relays, high-voltage transmission equipment and plant electrical distribution equipment。
Ii. Gas power plant production processes and systems
1. Gas power plant production process
The air compressor is required to generate heat from the surrounding air through an induct and import, pressurization and delivery to the incendiary, gas from the gas tank into the incendiary burner and the condensed air together, compressed combustion gas flow from the combustion chamber into the turbine, gas inflating and driving turbines, generating machinery that enables turbine-driven generators and compressors, the tail gas within the combustion engine into the residual heat boiler to heat the water to make it high-temperature vapour, powering the motor power plant, generating electrical power, lifting through the generator to the main transformer, and powering through the transmission line。
2. Three main systems for gas power plants
(1) simple cycle system (gas turbines)
The pressurizers continuously inhale and compress the air from the atmosphere, then compress the air into the combustion chamber, mix it with the injecting fuel and then burn it into high-temperature gas, expand in some of the inflow of gas into the gas vent level, act as a catalyst for the rotation of the gas turbines with the gas turbines, drive the gas turbines to turn, transport some of the gas to chemical sewage and other wastewater treatment systems for clean-up, and cool some of the gas to the combustion engine water cooling system and to the plate heat exchangers, producing heat to the central heating station to provide heat, and some of the tail gas to the remaining heat boilers。
(2) combined cycle system (air turbines)
The pressurizer inhales and compresses the air from the atmosphere, compresses the air into the combustion chamber, mixes with imported fuel and then burns into high-temperature gas, high-temperature exhausts of gas turbines (9es at 538°c, 9fs at around 609°c), discharges the remaining heat boiler (hrsg) through the flueway, applies thermal exchange method to heat up the water supplied in the boiler, produces high-temperature and high-pressure vapours, enters steam turbines for work (which functions as a source of cooling through the cycle cooling water system) and drives steam turbine generators to power。
(3) power generation system (generator)
The turbines rotate through steam, resulting in machinery capable of working with the generators to generate electrical power, the generators rotate their fixed circuits to absorb the currents, and the powerful currents flow through the generators to the plant in two circuits, and the other to the sf6 high-pressure breakers, which are delivered from the sf6 high-pressure breakers to the grid。
3. Joint cycle power generation
Gas turbines and generators, together with residual heat boilers and steam turbines, form a cycle system, which converts high-temperature spent smoke from the operation of gas turbines into steam through recovery from the residual heat boiler, and then injects steam into steam turbines. It takes the form of gas turbines, steam turbines and axles that drive a single-axis joint cycle of a generator, as well as gas turbines and steam turbines that drive their respective generators ' combined multiple-axis cycles。
Gas turbines are a rotary thermal engine of both air and gas, which is structured in the same way as aircraft jet engines, similar to steam turbines. The main structure consists of three components: a gas turbine (altitude or power turbine); 2 gas presses (air compressors); and 3 combustion chambers。
The method of work is that the leaf wheel compressor absorbs air from the outside and compresses it and then transports it into the combustion chamber, while the fuel (gas or liquid fuel) is injected into the combustion chamber and is mixed with high temperature compressed air, burning under a fixed pressure. The generation of high-temperature high-pressure flue gas into gas turbines to function as a catalyst for high-speed rotation of power blades and the discharge or reuse of depleted gases into the atmosphere。
Gas turbines have the advantage of being efficient, powerful, small, investing, operating at low cost and having a longer life cycle. Mainly for power generation, transportation and industrial power. Gas turbines are divided into light gas turbines and heavy gas turbines, and the transformation of light gas turbines into air engines has the advantage of being fast-mounted, small-sized, fast-started, simple-cycled and efficient, mainly for power thawing and ship power. Heavy gas turbines are industrial combustion engines with the advantage of operating reliably, high smoke discharge temperatures and efficient combinations, mainly for combined cycle power generation and cogeneration. The ms9001e gas turbine generator unit at the zaoshima power plant is 50hz, 3000r/min, which is a direct moving generator. This type of gas turbine generator was first commercially operated in 1987 with a power of 123. 4 mw at basic load gas combustion, a heat efficiency of 33. 79%, exhaust temperature of 539°c, exhaust of 1476 x 103 kg/h, pressure ratio of 12. 3, initial gas temperature of 1124°c, full automation and remote control of the unit, approximately 20min from start-up to full load normal time, and a markv control and protection system。
Iii. Gas power plant support units
1. Lubricating oil systems
The system is outlined as providing sufficient quantities of gas turbines and generators bearings, sub-tangible auxiliary gear tanks with appropriate temperature and pressure, clean lubricating oil during the start-up, normal operation and shutdown of the aircraft, thus preventing the burning of the axle, which causes convulsions due to overheating of the bearings, and providing for start-up transformers as hydraulic fluids and lubricants. In addition, a portion of the lubricant is separated and filtrated for hydraulic control or for hydraulic fluids for hydraulic control devices. Mainly, there are main lubricants pumps, auxiliary lubricants pumps, accident pumps and oil mist extraction units。
2. Commencement of the system
In normal operation, two thirds of the cooling power of the gas turbines is used to drag the pressurizers, while the remaining one third is used to output power. It is clear that during the combustion engine launch process, external power must be used to drag the rotation of the motor group and then remove the external power equipment after it has been activated. At the same time, because of the static nature of the rotors, their inertia and friction, in order to reduce the power of the external power equipment, they are to be activated by the move of the vehicle's gearing apparatus. We refer to the activation system as the off-site power equipment for combustion engines and its associated systems. The second feature of the start-up system is to act as a cold-carrying device after the shutdown. The rotors are not convoluted due to the uneven heat and cooling。
The main ones are a car electric wheel, a starter, and a fuel pump。
3. Hydraulic oil systems
Hydraulic oil systems are used to provide hydraulic fluids to the hydraulic implementing agency of the crew. The main hydraulic pump is driven by the auxiliary gear box and the auxiliary hydraulic pump by the electric motor. There are mainly auxiliary hydraulic pumps and main hydraulic pumps。
4. Fuzzy air systems
In the group of gas turbines using liquid fuels, for better aerosolization of liquid fuels and more efficient combustion, pressure-added aerosolized air systems are required. The aerosol air system provides sufficient pressure in the mist air cavity of the fuel nozzles, where the mist air is sprayed in the combustion chamber in a manner that is processed on the nozzles and vents, impactes the fuel from the nozzles, breaks the oil drops into a mist and solves the problem of the mixing of the oil with the air. The aerosol air system has been working throughout the entire trial transport of the ignition, heating, speed and crew。
