6 MW biomass power plant

Scheme is introduced

Changsha boiler plant co., LTDHunan the machine engineering co.,

LTD

In June 2013

1. SummaryPlans to build a plant, the total installed one machine as a furnace, is proposed to choose 1 x 35 t/h circulating fluidized bed boiler, 1 x 6 MW condensing steam turbine generators, boiler's rated steam pressure is 3.82 MPa(g), the rated steam temperature is 450 ℃.Main building according to the three column type (across different, oxygen fuel bin across, turbine across) arrangement; Chimney tower 1, USES the reinforced concrete structure, the high 60 m.

Factory set up diesel generators as a black start power source.Factory using DCS centralized control mode, improve the level of automation control.Steam turbine generator cooling water system in circulating cooling method, the water source is assumed to be taken to the nearest water.Main workshop (bent) using reinforced concrete frame structure system, the turbine housing surface using composite roofing steel sheet, steel roof overlying turbine room crane beam steel structure.

This engineering design, the manufacture standard USES the law of the People's Republic of China on the current national standards, rules, regulations and rules.2. The unit type selectionIn order to improve the overall thermal efficiency, unit parameters using pressure 3.43 MPa (g), temperature 435 ℃, the machine furnace selection scheme is: 1 x 35 t/h + 1 x N6MW.2.1 circulating fluidized bed boiler units 1Rated evaporation: 35 t/hCombustion mode: circulating fluidized bed

The rated steam pressure: 3.82 MPa(g)The rated steam temperature: 450 ℃2.2 steam turbine 1Model: N6-3.43power:6 MWSpeed: 3000 r/minRated into the steam pressure: 3.43 MPa(g)Admission rated temperature: 435 ℃Rated into the steam quantity: 29 t/hThe exhaust steam pressure: 0.007 MPa(a)

3. The plant layoutAccording to the design code for China, the factory covers an area of 15000 m2, as shown in the "general layout".

4. The fuel system4.1 transportation fuel

Design fuel: biomass fuel 80% + 20% mixed burning bituminous coal. Boiler

fuel into the factory USES the motor transport, cutting and broken inside the

plant, biomass fuel particle size 50 mm or less when charging, charging coal

particle diameter of 13 mm or less. Into the furnace fuel conveying system

using belt conveyor automation.

Skiploader翻斗式装载机

Biomass fuel stock-cutte on site

Double belt conveyors will guarantee the safety and

Reliability of the boilers’ fuel supply.

Biomass fuel conveyor gallery

Before the biomass furnace feeding system

5. The main building layoutThree columns is used in the main factory building type

parallel arrangement, across the boiler, oxygen fuel bin

and across the turbine. 7.00 meters layer set boiler open

platform.

Biomass power plant system

6. The hydraulic system6.1 circulating water systemThis project cycle cooling water system USES machine ventilation cooling tower secondary circulating water system. Each unit configuration two machine force ventilation cooling tower and circulating pump.6.2 the boiler make-up water systemAccording to the water quality data , regulations codes and units for soda quality requirements, the power plant boiler make-up water treatment system adopts pretreatment + level of desalination + mixed ion exchanger. The whole system is divided into three parts: preprocessing part, level of desalination part and ion exchange.

7.电气系统Electric Power System

根据业主及当地条件设置According to owner and local

conditions.

8. The thermal control systemBoiler, turbine and generator controlled by distributed control system (DCS), fuel pump, water pump, air compressor station is included in the DCS control system.Turbine DEH and turbine ETS will vary depending on the turbine ontology. Through communicate with the DCS or hard wiring way.Auxiliary workshop: water treatment system, cooling water system, feeding system, ash and slag system adopt PLC control, through the communication with DCS.Factory set up a centralized control room, centralized monitoring unit machine furnace electricity and utility system. Adopt LCD, keyboard and mouse to monitoring unit and the utility system.

9. Civil engineering systemsMain factory buildings and other structures include: main workshop, induced draft fan for boiler, steam turbine generator pedestal, chimneys, stents, the flue, etc.Turbine room, oxygen coal (bent) using reinforced concrete frame structure system. Turbine housing surface adopts the steel roof truss, overlaying composite roofing steel sheet; Other floors, roof adopts the cast-in-place reinforced concrete beam and slab structure; Turbine room crane beam steel structure; Turbine base for the cast-in-situ reinforced concrete structure. Setting deformation joint between boiler furnace frame and main workshop, make two completely separated from the mechanical system.

Auxiliary system architecture include:1) hydraulic and water system building and structures:Including foundation of integrated water purifier, clear water reserviors, comprehensive water pump house, boiler make-up water treatment workshop, industrial waste water treatment station, outdoor unit sink, water and wastewater facilities etc.;2) electrical system architecture and structures, including outdoor substation, the lightning rod, etc.;3) fuel systems and structures, including fuel conveying trestle, library, etc.;4) affiliated buildings: including maintenance workshop and warehouse, guards, etc.

10、temperature medium voltage biomass in 35 t/h CFB boiler is introduced10.1, boiler main parameters and performance indicators10.2 overall overview, biomass circulating fluidized bed boiler10.3 main technical characteristics, boiler

10.1, boiler main parameters and performance indicatorsRated evaporation: 35 t/hThe rated steam pressure: 3.82 MPaThe rated steam temperature: 450 ℃The rated water temperature: 104 ℃Exhaust temperature: 150 ℃The design heat efficiency: 88.5%Cold air temperature :30 ℃A hot blast temperature :150 ℃Secondary air temperature :150 ℃Design fuel: biomass fuel (moisture content 35% or less) 80% + 20%

mixed burning bituminous coalFuel consumption: biomass fuel 20 t/h

Bituminous coal 6 t/hRunning layer level: 7000 mm

Boiler allows you to load the adjusting range is: 50-100%Boiler dimension:Width (boiler steel frame centerline) 4540 mm (including platform width 8420 mm)Depth (boiler steel frame centerline) 11580 mm (including platform depth 14200 mm)Height (drum center level) 28000 mm (including the canopy height 32998 mm)Fuel to adapt to the situation:1, can be fully burning biomass (biomass fuel moisture content 35% or less, but the runtime needs to join the cycle Material (loop material particle size of 0 ~ 1 mm, the moisture content < 10%), circulation material is recommended:Kaolin, clay, coal ash, etc.;2, can be fully developed bituminous coal, lean coal and lignite.Fuel particle degree requirements:The largest biomass fuel particles require 50 mm or less (charging before bark, waste wood and so on need to be broken,Twigs, straw, etc need to shear);Coal granularity requires 13 mm or less. Grain size distribution of coal proportion is: 1 mm below 25%,1-5 mm (60%), 5-13 mm (15%).

10.2 overall overview, biomass circulating fluidized bed boilerTemperature in the boiler for medium voltage parameters, single drum, natural circulation, island type is decorated, all steel bearing combination of circulating fluidized bed boiler.Boiler using high temperature heat insulation volute cyclone separator gas-solid separation, operating floor elevation is 7000 mm.Boiler steel frame is composed of three spans, first across the chamber, the second span arrangement of high temperature insulation volute cyclone separator, feed back,The third cross layout tail flue - superheater, economizer and air preheater.Furnace membrane type water wall structure used to decorate in the upper chamber of a stove or furnace along the width direction of the three high temperature superheated steam screens and 2 chip water-cooling panel.For water cotton gauze wind plate at the bottom of the furnace and water cooling chamber; With water cooling bed room is connected to a duct layout 2 oil ignition burner,Used to start the ignition boiler.Boiler adopts front wall concentrated feeding method, at the bottom of the front wall water wall uniform arrangement of two biomass fuel feeding mouth, at its center placement one for coal over ( can be added as recycling material）.

Ventilation board set on three discharge mouth, one in the middle used as slag and the furnace overhaul accident.A volute cyclone separator are high temperature heat insulation between the furnace exit and the tail shaft flue, a down to the bottom of the cyclone separator feeder is equipped with water-cooled dipleg of return, return feeder cyclone separation material back to the furnace.Tail shaft flue arrangement in order of low temperature superheater,economizer and air preheater heating surface, and at every level of heating surface inlet side pulse blowing system. Superheater is equipped with level 1 water spray attemperator in the system.Boiler adopts two levels with the wind, a wind from the bottom of the furnace through ventilation plate into the chamber, secondary air enters the furnace to once upon a time back wall respectively.Boiler left and right sides is symmetrical arrangement on the whole, bearing on the boiler steel frame. Boiler startup bed material for coal ash.

10.3 main technical characteristics, boiler1, the chamber of a stove or furnace adopts full membrane type water wall structure, reliable sealing;2, adopt efficient volute inlet cyclone separator, high separation efficiency,Material circulation is smooth, not accumulation, cycle less material to join;3, overheated furnace water-cooled panel layout and screen, reduce screen dust, to reduce the temperature, reduce the bedThe possibility of high temperature anti-coking;4, continuous stable biomass feeding system;5, load adjustment than large, fuel wide adaptability;6, reliable wear design structure;7, set many years of CFB boiler design and manufacturing experience, guarantee of the boiler dhi sex good, strong security, high boiler efficiency;8, advanced management, good quality, excellent after-sales service.

Thanks!