Because of adoption of new CFBC technology, the structure is simple and compact, similar to structure of pulverized coal fired boiler. The boiler proper is comprised of combustion equipment, coal feeder, water-cooling system, and high temperature cyclone separator, super heater, air heater, steel structure, stairs and furnace walls.
Between furnace and convection draft, there are 2 sets of ID 3.4m cyclone separator, whose shall be made of 8mm steel. The upper of it is sophisticated form; the lower of it is cone-shape. There are anti-wear and anti-fire layer in flue gas part, between steel and above layer, there is keep-warm material with nail and plate to fix. The convection part between sophisticated form and cone-shape, there is supporting device on the steel beam.
The loopback device uses auto-balanced J type loopback material valve, whose features are that automatically set up material sealing after starting of the boiler, when adding air, it can realize materials’ automatically circulation. 
In the tail draft, there are economizers superheaters of both low and high temperature and air pre-heater. In superheater system, there is spry water desuperheater between them.
This boiler uses two steps air: primary air come to furnace from WC wind box and head, secondary air comes to furnace from front and wear side of the combustion chamber. There are 3 feeding coal points, and limestone can be through the feeding coal device into furnace.
At the bottom of furnace, there is WC wind chamber. There are 2 sets to starting fire device by light diesel. 
In about 900℃ bed, fuel, air and limestone can mix in furnace dense region. The coal discharging the heat in fluidized form and materials, flue gas and WC wall heating surface could change heat with each other. The limestone transformed into CaO and CO2, CaO+ SO2→ CaSO4. So reach the desulfurizing in the furnace. The flue gas come out with 139℃ discharging outside the boiler proper. The solid would return to the furnace to realize circulation.  
The center nominal height of drum is 27550mm. the depth of front and rear pillar is 13100mm with width 7100mm between them.
Steam and water circulation system includes rear economizer, drum, heating surface, WC wall and convection draft superheater. 
This boiler uses single main line, which could be divided into 2 ways, one way to spray desuperheater, the other to inlet header of economizer with 2 pipes to adjust the load.
The water came firstly from inlet header of economizer, then passes low-temperature economizer tube tank, after heating, goes into middle header, then goes into high-temperature economizer tube tank, then passes outlet header of economizer, at last goes into drum. Between drum and inlet header of low-temperature economizer, there is tubes to realize circulation for economizer.
The steam and water circulation system includes drum, down comer, WC wall, tubes.

The water forms into mixture between water and steam, absorbed heat by WC wall. The mixture came into upper header and passes tubes to drum. When the mixtures in drum water and steam could be divided, and water retakes part in circulation, but steam goes into superheater system.
The steam goes into inlet header of low-temperature superheater from drum. The steam passes low-temperature superheater to get heat, the goes to outlet header, then comes into spray desuperheater, then goes into inlet header of high-temperature superheater, after getting heat by heating surface to 485℃, goes into hanging header, finally to the outlet header of high-temperature superheater.

water pressure test m3 nominal operation m3 △
drum 16.3 6.95 9.35
WC wall 13.6 13 0.6
superheater 6.1 0 6.1
economizer 9.5 9.5 0
total 45.5 29.45 16.05
There are 2 step crushing device according to the particle size, after the last step of crushing device, the coal should be line with requirement for furnace to burn.
In front of furnace, there are 3 feeding coal devices according to the load of boiler, whose ability has auxiliary volume of 75%, 2 sets of feeding coal device can make sure 100％ coal load.
Bed assembly is water-cooled type, and heat preservation concrete and anti-fire concrete are filled in the gaps between air nozzles above the bed. Air is comprised of primary air and secondary air, and the ratio is 60:40, primary air gets in from rear part of oil burner, and gets into combustion chamber from pores in the air nozzles of bed. Secondary air is sent from upper part of bed。
The boiler adopts technology of water-cooling bed and oil firing under bed with oil pistol. Burn oil pistol under the bed, then mixed with cold air to be high temperature gas, and then gets into air box to heating material. Early stage of firing is to preheat boiler proper, then increase temperature according to temperature of material layer. Oil pressure is about 2.5MPa, oil quantity is 80~200Kg/h, light diesel oil adopted. Oil pistol is atomized mechanically. It is advised that fix expansion vent of water-cooling air box in the primary gas duct. Sweeping Medium pressure: 0.8～1.2MPa. Before starting fire, the bed should be with thickness of 400mm, the particle size is 0～3mm. When reaching 500～550℃, begin to reduce the coal, when reaching 900℃, we can ceasefire. 
Boiler smoke ventilation system
Balanced ventilation boiler furnace pressure zero set in the furnace exit. Circulation of materials within the circulating fluidized bed by the blower (including one or two fans), the Roots blower and induced draft fan to maintain. From a fan out of the air by an air preheater heated air into the furnace at the bottom of the primary air chamber, wind through the cloth hood panel of the bed material flow and the formation of solid circulation upward through the furnace; secondary air by the second Air preheater heated air to the furnace side of the argument, from the bottom of the furnace wall into the furnace before and after the combustion chamber; the second road on both sides of the secondary air duct from the boiler leads to an air duct to the blast furnace, and then trail leads from the wind 3 coal drop pipe branch pipe to the wind as the broadcast of coal. Carry out the furnace flue gas of solid particles, through import of flue cyclone, respectively, into the two tangential cyclones. In the separator, coarse particles separated from the flue gas, and gas flow through the tube into the flow splitter center shaft, flue gas cooling by convection heating surface, through the tube into the air preheater flue gas dust removal Composition of fine particles, and finally, by the suction fan into the chimney, and into the atmosphere.
Ash recycling system
Furnace, cyclone, and returned to the formation of three major components feeder boiler ash recycling system, a wind from the layout of the board in the water-cooled cloth hood air into the furnace at the bottom of the dense, so that the material flow of the furnace, high temperature materials and full mix of coal and limestone particles in the dense phase zone to complete combustion desulfurization process. Flow of large particles of suspended material is to a certain height, along the stream back to the bottom of the furnace water wall surrounding the dense, fine granular material were carried out the furnace flue gas through the variable cross-section of the cyclone is speed when imported flue , the high tangential flue gas into the cyclone within the high-speed rotation in the cyclone, the flue gas by the centrifugal force the quality of the larger solid particles are thrown to the cyclone wall, along the back wall down into the feeder , and the quality of the smaller solid particles with the flue gas through the cyclone at the top of the center of the tube, into the boiler convection shaft. Separator cyclone is with advanced and mature technology, with central tube bias structure, the total separation efficiency of up to 99%.
Slag and ash system
Coal ash comes from the furnace to the lower end of the fly ash and discharge out of boiler. According to coal particle size, coal ash characteristics of different types of ash share will be different. As to design of this boiler coal and coal into the furnace size, the bottom ash residue of the total volume of 40%; fly ash accounting for 60% of the total.Three of the boilers were set residue discharge port, located in the lower chamber, put the heat-resistant steel tube with residue; can be connected to the slag cooling conveyer.
　　
testing arrangement
steam and water system testing arrangement
The boiler water system is according to different requirements in different parts of the instrument layout of the various functions of measuring points. Pressure steam pipe measuring points are in place to monitor pressure gauges, the other for pressure measurement points are to a valve, the user may require configuration control instruments, both of which place pressure monitoring for the other pressure measuring point the user can By detection, protection, regulation, and different requirements lead to everywhere.Maintain the natural circulation drum boiler normal water level is a necessary condition for safe operation, usually set a certain number of water levels as a monitoring tool. Place to monitor the water level in the boiler drum used in color on the ends of the cylinder water level, water level of the visible height of 550mm. Each level gauge can be equipped with a TV monitor before the device can be used to monitor the switching device staggered ends of the drum water level. The center of the cylinder on the drum set a water level gauge for electric contact with the water level monitoring and alarming, when the water level of protection than limited value, the boiler automatically splitting; but can also shutdown the drum full of water to meet the testing requirements.
flue gas testing arrangement
Circulating fluidized bed boiler, in addition to the same layout and pulverized coal flue gas temperature, pressure, sampling, measuring points, because of its specificity, but also set a number of chamber pressure, bed temperature, flow of air pressure, air flow measurement points Provide the necessary means of monitoring and protection measures to ensure the safe operation of the boiler.The lower part of the furnace, the upper and bottom of the bellows were set up a 3 on the gas pressure measuring point, the pressure signal from the differential pressure transmitter will be converted to electrical signals, through changes in pressure to regulate the amount of slag, the furnace bed Pressure to maintain the required range. Negative pressure zero is in the furnace exit. Set separator exit flue gas pressure measuring point 2, measure the resistance loss of separation. Each set Refeeder Standpipe Level 2 pressure measuring point to monitor material level within the riser height.Set in the furnace flue gas temperature measuring point 10, flue inlet and outlet separated flue gas temperature were set four measuring points, the measuring point in the high temperature, high-speed and high ash concentration smoking areas must be selected wear Thermocouple, in order to guarantee life.Convection heat transfer surface of each shaft in the import and export are set temperature and pressure measuring points, while overheating of the outlet temperature set an oxygen measuring points, in the air preheater can be set on the export of flue gas sampling a certain number of points and SO2 sampling points, the specific location and quantity determined by the Design Institute.Revert to set two material temperature measuring points, returning materials to set two bellows pressure measuring points, to adjust the air pressure back through the quantity, to ensure a good flow of material and the smooth return of the furnace.