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Power Generating SetsSteam Turbine GeneratorSteam Power Generation System Customized 10MW-50MWSteam GeneratorSteam Turbine
Markevina Technology (Shenzhen) Co., Ltd.
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Product Description Steam Turbine Generator,Steam Power Plant,Steam Power Generation System Customized 10MW-50MW2.1 Basic construction conditions2.1.1 Site Project planning and construction site;2.1.2 Site conditions The construction site must have three connections and one leveling (water, electricity, access and a level site) .2.1.3 Geological conditions The geological survey report provided shall prevail.2.1.4 Earthquake intensity The regional earthquake index is 8 points .2.1.5 Water Source The water used for the project's construction, production and fire fighting is all taken from the water supply system within the factory.2.1.6 Drainage Connect to existing drainage system .2.2 Installation planThe new coal-fired power plant supplies electricity to the external grid while meeting its own electricity load. The proposed installed capacity plan for this project is: 3×50 t/h medium-temperature and medium-pressure circulating fluidized bed boilers + 2×15 MW condensing steam turbine generator sets, with no consideration for reserved expansion.2.2.1 Host Model(1) Boiler: Circulating fluidized bed boilerBoiler evaporation capacity: 50 t/h ;Superheated steam pressure: 3.8 MPa ;Superheated steam temperature: 450 oC ;Boiler feed water temperature: 104 oC ;Boiler efficiency: ≥ 85 % ;Layout: semi-open-air layout;Number of installations: 3 units ;(2) Steam turbine: condensing steam turbineModel : N15 - 3.43 ;Steam turbine rated power: 15 MW ;Rated steam inlet pressure /temperature: 3.43 MPa (a) / 435 oC ;Rated exhaust steam pressure: 0.007 MPa (a) ;Number of units: 2 units ;( 3 ) GeneratorModel: QF - 15-2 ;Rated power: 15MW;Voltage: 10.5 kV ;Power factor: 0.8 ;Speed: 3000r/min ;Number of units: 2 units ;2.3 General layout2.3.1 General layout of the plantAccording to the production process requirements, combined with external conditions such as natural terrain conditions, power lines, water supply and drainage pipelines, heating pipelines and the characteristics of various buildings and structures, and taking into account the transportation methods and vehicle and passenger flow of the entire plant, this design divides the entire plant area into production areas, auxiliary production areas, fuel areas, etc.The overall layout of the plant is as follows:The plant area is arranged in an east-west direction, with the main plant building arranged on the north side. According to the production process requirements of the cogeneration project, the plant area is arranged into three areas: auxiliary production area, production area, and fuel area. The main plant building of the production area is located on the northeast side of the plant area, and the fixed end is on the west side. From north to south, the area is: steam engine room - deaeration coal bunker room - boiler room - dust collector - chimney. The west side of the plant area is the auxiliary production area, which is mainly arranged with a chemical water treatment room, a comprehensive water pool, and a cooling tower. The southeast side of the plant area is the fuel area, which is equipped with a closed dry coal shed. The fuel is first sent to the coal crushing building for crushing through a coal conveyor belt, and then sent to the coal bunker room of the main plant through a coal conveyor belt.2.3.2 Vertical layout of the plantAs the natural terrain of the site is relatively flat, the vertical layout is combined with the existing layout of the factory area. Overall, scattered water is combined with urban road curb drainage, and rainwater is discharged along the road to the rainwater pipe network outside the factory.2.4 Heat engine part2.4.1 Main plant layoutThe main plant of this phase is arranged with 3×50t /h medium-temperature and medium-pressure circulating fluidized bed boilers + 1×15MW condensing steam turbine generator sets.The main powerhouse adopts a three-row layout, which is the steam engine room-deoxygenation coal bunker room-boiler room. Bag dust collector, ash removal device, induced draft fan, desulfurization device (reserved), denitrification device, and chimney are arranged behind the boiler. The column distance of the main powerhouse is 6m , the boiler is arranged in a semi-open-air layout, and the operating floor elevation is 7m .2.4.1.1 Turbine room layoutThe steam engine room is 48m long and 15m span. The steam turbine generator set is arranged on two floors, with the ground floor elevation of ±0.00m, the operating floor elevation of 7m, the top elevation of the running track of 14m, and the lower elevation of the roof truss of 17m.The steam turbine generator set is arranged longitudinally, and there is space at the generator end for pulling out the rotor. The ±0.00m floor at the expansion end of the steam turbine room is an equipment maintenance site; a 16/3.2t electric double-beam bridge crane is installed on the upper part of the steam turbine workshop, with a track top elevation of 14m, a lifting height of 16m, and a travel span of 13.5m. The auxiliary equipment of the steam turbine generator set is arranged on the steam turbine side of the 0m floor, and a generator outlet room is set on the generator side. Three boiler feed water pumps are arranged on the zero-meter floor of the steam turbine room. Both the fixed end and the expansion end of the steam turbine room are equipped with doors leading to the outside, which can pass cars.2.4.1.2 Layout of deaerated coal bunker roomThe deaerated coal bunker room is 48m long and 9m across. The zero-meter floor is equipped with high and low voltage distribution rooms. The 7m floor is equipped with the centralized control room for boiler electricity , the electronic equipment room, the main steam and main feedwater operation platform. The 13.5m floor is equipped with two 65t/h low-pressure rotary film deaerators, one LP-5.5 continuous blowdown expansion tank and three boiler raw coal bunkers. The 23.5m floor is equipped with two TD75 B=650 coal conveyor belts. The roof elevation of the deaerated coal bunker room is 27m.at the fixed end of the deaerator coal bunker room and a fire staircase at the extended end.2.4.1.3 Boiler room layoutThe boiler is tightly enclosed, and the operating floor elevation is 7m. The span is 21m and the length is 42m. Each boiler is equipped with one primary and one secondary fan and two Roots blowers (one for use and one for backup) on the zero-meter floor. Two drain pumps, two drain tanks and one drain expansion tank are also arranged on the zero-meter floor . The fan sucks air on site. An electric hoist with a lifting capacity of 1 ton is installed on the top of the furnace for lifting during maintenance.2.4.1.4 Layout behind the furnaceThe tail of the boiler is equipped with a bag filter, induced draft fan, reserved wet desulfurization device , denitrification device and chimney. The chimney is a concrete chimney with an outlet diameter of 3.0m and a height of 100m . The induced draft fan is arranged outdoors with a rain cover.2.4.2 Boiler smoke, air and combustion systemAir supply system: CFB boiler combustion system adopts two-stage air distribution. The primary air is heated to about 150 oC from the primary fan through the air preheater, enters the primary air chamber in two ways, and enters the combustion chamber of the furnace through the air cap. The secondary air is also heated to about 150 oC from the secondary fan through the air preheater, enters the secondary air box in two ways, and enters the combustion chamber from the upper part of the dense phase area through several secondary air nozzles. The ratio of primary and secondary air volume is about 0.6 : 0.4 . During operation, the primary and secondary air volumes and the boiler return volume can be adjusted to control the combustion chamber temperature to achieve the purpose of complete combustion, and can also control SO 2 and NO X generation and emission.The primary and secondary fans of the boiler are adjusted by the fan inlet damper, and the motor is temporarily set as an industrial frequency motor.Each boiler is equipped with one primary air blower and one secondary air blower. The primary and secondary air blowers are arranged on the 0m floor of the boiler room.Induced draft system: Each boiler is equipped with one induced draft fan.Balanced ventilation is adopted in the boiler furnace, and the pressure balance point is located at the furnace outlet. After the flue gas passes through the cyclone separator to separate most of the dust, it enters the vertical shaft at the rear of the boiler, passes through the heating surfaces of various levels, the economizer, and the air preheater, and the dusty flue gas is dedusted by the high-efficiency bag filter, and then enters the desulfurization tower and chimney through the induced draft fan, and finally discharged into the atmosphere.The boiler induced draft fan motor is tentatively designated as an industrial frequency motor.Coal feeding system: Raw coal with a diameter of less than 10mm falls from the raw coal bin in the coal bunker room to the belt weighing coal feeder, and is sent to the coal spreading port on the front wall of the furnace to enter the boiler for combustion. Each boiler is equipped with 3 coal feeders.Ignition system: The ignition fuel is 0# light diesel, with a 20m3 oil storage tank, 2 oil supply pumps and 1 oil unloading pump.The boiler uses water-cooled air distribution plates, oil guns, under-bed ignition technology and ignition devices. The oil gun burns in the under-bed pre-combustion chamber, then mixes with cold air and enters the combustion chamber through the wind chamber to heat the material. The oil gun uses compressed air atomization.2.4.3 Thermal system(1) Main steam systemThe function of the main steam system is to deliver the new steam produced by the boiler from the superheater outlet to the steam turbine for work , and at the same time supply steam to the steam seal system of the steam turbine during the startup and shutdown of the unit .This system adopts the main pipe control. The steam from the superheater header outlet is connected to the main steam main pipe through the main steam pipe, and then led to the main steam valve of the steam turbine through the main steam main pipe. For the boiler water pressure test, an electric isolation valve is installed in front of the main steam valve of the steam turbine, and the main steam pipe in front of the electric isolation valve participates in the water pressure test.The main steam pipeline is considered to have appropriate drain points and corresponding drain valves to ensure that the unit can drain the condensate in the pipeline in time during the start-up warm-up and low load or fault conditions to prevent the occurrence of water inflow accidents in the turbine. The drain pipeline is connected to the corresponding main pipe according to the pressure level, and the drain main pipe is connected to the drain expansion tank.(2) High-pressure water supply systemAccording to the working pressure of the feedwater pipeline, the pipeline from the outlet of the feedwater pump to the inlet of the boiler economizer is a high-pressure feedwater pipeline. This phase of the feedwater system adopts a single mother pipe, and is equipped with two DG85-80X9 electric feedwater pumps, one for use and one for standby during normal operation. The feedwater operation platform is arranged on the 7m operation floor of the deaerated coal bunker. The high-pressure feedwater enters the economizer through the feedwater operation platform. The high-pressure feedwater is heated by the flue gas at the tail of the boiler, which increases the heat of the feedwater, reduces the temperature of the flue gas, and improves the thermal efficiency of the unit.In the system, check valves and electric gate valves are installed in sequence on the outlet pipe of the water feed pump. At the outlet of the water feed pump, there is a minimum flow recirculation pipe for the water feed pump connected to the check valve body and equipped with corresponding control valves, etc., to ensure that the flow rate flowing through the pump during unit startup or low-load conditions is greater than its allowed minimum flow rate; the recirculation pipe of each pump is connected to the deoxygenated water tank.The superheated steam spray cooling water comes from the main feed water pipe in front of the boiler feed water control panel .(3) Low-pressure water supply systemAccording to the working pressure of the water supply pipeline, the pipeline from the outlet of the deaerator water supply tank to the inlet of the water supply pump is a low-pressure water supply pipeline. The low-pressure water supply adopts a single main pipe and is connected to the inlet of the water supply pump. In the system, along the water flow direction of the low-pressure water supply pipeline, a manual gate valve and a filter are installed in front of the inlet of the water supply pump. The function of the filter is to prevent foreign matter that may be accumulated in the deaerator water supply tank or the water inlet pipe during the installation or overhaul process from entering the pump to protect the water supply pump.The low-pressure water supply system is equipped with two 65t/h low-pressure rotary film deaerators.(4) Steam turbine condensate heat recovery systemThe heat recovery system is considered as one-stage low-pressure heating + one-stage deaerator. The condensate in the condenser hot well is sent to the deaerator by the condensate pump through the steam seal heater and the low-pressure heating . In order to ensure that there is enough condensate to cool the shaft seal heater when the steam turbine is under low load, a recirculation pipe is added to the main condensate pipeline to ensure the amount of condensate passing through the shaft seal heater when the steam turbine is under low load. The amount of water is adjusted by a valve.The steam for the deaerator comes from the non-adjustable extraction steam of the steam turbine.Each machine is equipped with two condensate pumps with a capacity of 105% load , one for use and one for backup.(5) Shaft sealing systemIn order to reduce the leakage loss at the shaft seals at both ends of the turbine cylinder , shaft seals are installed on the cylinder, including front steam seal, rear steam seal and partition steam seal. The steam seals all adopt high and low tooth maze type. The steam pipe for supplying steam for the shaft seal is connected from the front of the main steam valve of the turbine. In addition, the steam leakage from the steam seal enters the steam seal heater through the pipeline .(7) Drainage systemWhen the boiler or steam turbine is started, shut down or operated at low load, the condensate accumulated in the main steam and its bypass pipes and valves must be discharged quickly, otherwise it will enter the flow part of the steam turbine and cause water hammer or cause other equipment failures.It is equipped with 1 drain expansion tank, 2 10m3 drain tanks, and 2 drain pumps, and the operation mode is one in use and one in standby.(8) Make-up water systemheat users in this project is not considered for recycling, and the desalted water is sent to the boiler deaerator as make-up water to make up for the loss of working fluid in external steam supply. The desalted water output is 80t/h.(9) Industrial water systemIndustrial water is supplied by the industrial water pump in the chemical water workshop to the industrial water pipeline in the main factory building . It is used to cool the steam-water sampling device, some rotating equipment, etc. In order to save water, the industrial water system is equipped with an industrial water return pipeline.(10) Boiler blowdown systemThis phase of the project is equipped with one 5.5m3 continuous blowdown expansion tank and one 7.5m3 periodic blowdown expansion tank. The boiler continuous blowdown is connected to the continuous blowdown expansion tank located in the deaerator layer , the recovered secondary steam is connected to the deaerator steam balance main pipe, and the blowdown water is connected to the periodic blowdown expansion tank.The boiler's regular blowdown is connected to the regular blowdown expansion tank .(11) Vacuum systemThe operation of the steam turbine requires maintaining a certain vacuum degree, and the air in the condenser, condensate pump, etc. must be extracted. They are connected by pipes and then connected to the water jet vacuum pump to form a vacuum system.Each unit is equipped with 2 water jet pumps (one for use and one for backup), 1 water jet vacuum pump and 1 water jet tank .(12) Lubricating oil systemThe turbine oil system consists of an oil cooler, oil filter, AC and DC lubricating oil pumps, a main oil tank, an emergency oil pool and pipelines.During the startup, normal operation and shutdown of the unit, sufficient amount of clean lubricating oil with appropriate temperature and pressure is supplied to the bearings, transmission devices and ancillary equipment of the running generator, steam turbine to ensure the safe operation of the unit.The unit is equipped with 1 high-pressure centrifugal oil pump, 1 DC lubricating oil pump, 1 AC lubricating oil pump, 2 oil coolers, 1 main oil tank and 1 emergency oil pool.(13) Circulating cooling water systemThe condenser, oil cooler and generator air cooler must be continuously cooled with cooling water to ensure the normal operation of the unit. The cooling tower, circulating water pump, dosing device, circulating water pipeline and make-up water pipeline together constitute the circulating cooling water system.Three circulating water pumps are installed and arranged in the circulating water pump room on one side of the mechanical cooling tower.(14) Pipeline insulationThe smoke and air duct is insulated with rock wool board, and the outer protective layer is colored steel tile. The steam and water pipeline is insulated with aluminum silicate or rock wool, and the outer protective layer is galvanized iron sheet.(15) Factory piping systemThe steam pipelines in the factory area are laid overhead and are designed in a unified manner with the chemical plant area.2.5 Coal Transportation SystemThe fuel consumption of the boiler is shown in the following table:Boiler capacityHourly consumption t/hDaily consumption t/dAnnual consumption t/aRemarkThis period1 × 50 t/h9.522876000 finally3 × 50 t/h28.5684228000 Note: The daily utilization hours are 20 hours , and the annual utilization hours are 8000 hours. The low calorific value of raw coal is 4000kcal/kg.The coal transportation system of this project is designed based on a 3 × 50 /h medium- temperature and medium- pressure circulating fluidized bed boiler, and the coal transportation system adopts a dual-route , two -shift operation design.dry coal shed of this phase of the project is designed to be 30 m across and 100 m long , based on the consideration of 3 × 50 t/h boilers . There is no crane in the dry coal shed , but there are two coal pushers for stacking and mixing materials. The designed stack height is 5 m, which can store the coal consumption of the 5 × 50 t/h circulating fluidized bed boilers for about 15 days. The project has an open-air coal yard.A vibrating screen and a hammer crusher are installed in the conveying system , with an output of 100 t/h, a feed particle size of 200 mm, and a discharge particle size of less than 10 mm.The coal feeding system is designed to have an output of 100 t/h, using a dual-path B=650mm belt conveyor system, working in two shifts. The belt conveyor speed is 1.25m/s.The raw coal of this project is transferred from the dry coal shed to the coal bunker via the vibrating coal feeder and 1# belt conveyor to the crushing building, screened by the screening machine, crushed to less than 10mm by the crusher, transported to the 3# belt conveyor on the coal bunker layer in front of the furnace via the 2# belt conveyor, and unloaded into the coal bunker in front of the furnace via the manual plow type unloader .
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