Sell 75TPH 3.82MPa CFBC Boiler

Description

*5TPH 3.*2MPa CFBC Boiler is a brand new coal combustion technology with high efficiency and low pollution, whose features namely that there is a large amount of materials and supplies in the furnace which would be brought to the upper part by the flue gas during the combustion, then pass the separator at the outlet of the furnace. The mixture of materials and flue gas would be separated, at last materials and supplies would return back to the bed to perform circulating combustion by the non-mechanical loopback valve. Due to materials and supplies’ high concentration with large heating capacity, CFBC has large thermal capacity and can mix material uniformly; usually one kilogram of flue gas can carry over several kilogram of material. These circulation materials brings high heating transferring factor, which makes wide adjustment and range of boiler load and fuel. Fluidization speed of CFBC is higher than AFBC’s, so the bed area is not as apparent as AFBC’s. Because of strong turbulence and material circulation in the bed with lengthened burning time, CFBC has much more combustion efficiency than AFBC with no need to add assistant material.
The working temperature of CFBC is **0~**0℃, which is a perfect temperature interval for desulfuring. This boiler uses the technology of desulfuring inside furnace, after refueling desulfurizer(e.g. limestone), fuel and desulfurizer would take low-temperature combustion and desulfurization reaction with strong turbulence. At this moment Ca/S’s mole ratio is 2 with *0% desulfuring efficiency and reduction of the discharge of SO2. CFBC adopts step blowing-in at low temperature, which makes burning at lower excess air all the time, so reduces NOx quantity. Moreover has high combustion efficiency, wide adjustment and range of boiler load and fuel, realizing complex utilization of ash and slag and so on. Due to above mentioned, CFBC boiler has been rapidly developed all over the world and it has been widely accepted that CFBC boiler is the most practical and feasible combustion equipment with environmental friendly so far.
Using matching and designing coal, this boiler could keep the rated parameters of outlet steam of superheater within the rated load range of *0～**0%, when providing the constant pressure. And within the rated load range of *0～**0%, this boiler could reach  Stable combustion.
2 DESIGNING CONDITION & PERFORMANCE DATA
This boiler shall reside either indoor or semi-open-air. The mounting of this boiler combines suspension with sustaining with nominal height of operating floor—7m. This boiler utilizes single drum, natural circulation, concentrated down comers, balanced draft, heat insulating cyclone gas-solid separator, CFBC, convection heat surface arranged in convective pass.
2.1 MAIN DATA SHEET
2.1.1 Technical specification
Basic features
1． Specification of boiler
     â‘´rated steam output                               *5t/h
     ⑵rated steam pressure                             5.*9MPa
　 ⑶rated steam temperature                        **5℃
　 â‘·drum pressure                                       5.*4MPa
　 ⑸feed water temperature                         **4℃
  　⑹exhaust gas temperature                        **7℃
　 ⑺boiler designed efficiency                        *8.*7%
2． Fuel
Lignite is preferred in this boiler, the specification of it as below:
　　Var=*4.*6%
　　Qnet.v.ar=****5KJ/kg
　　Car=*9.2%
　　Har=1.*7%
　　Oar=8.*6%
　　Nar=0.*2%
　　Sar=0.2%
　　War=*1.7%
　　Aar=*8.*5%
boiler model：ZG**0/5.**-M
boiler type： Single drum, natural circulation, coal fired CFBC boiler with ∏ type arrangement.
The requirement of granularity of coal for this boiler is that: the range of lignite’s granularity is 0～8mm; The volume of partial coal whose granularity is less than **0m shall not greater than *0%, advocated range shown in below Fig:
Advocated range of coal granularity for this boiler
Along with the stricter requirement for environmental protection, new control standards for discharging SO2 and NOx of coal-fired boiler have been announced, which have been already taken into consideration in the designing of this boiler. Around the coal feeder in the front part of the boiler, there are two sets of the storage, the Φ**3 tubes have been used for connection between feeder and coal feeding tubes. The Limestone, which takes action in desulfurizing and circulation of materials and supplies, should be fed into the furnace with coal. If diameters of the limestone’s particle are oversize, smaller than superficial area, desulfuing would not be fully activated with low utilization rate. At same time, due to low of particle, the limestone is not able to finish the job in circulation of materials and supplies. But if the particle is too small with short residence time in bed, no good to desulfurization. For improving utilization rate of limestone, the diameter of particle should be controlled within the range of **1mm, and the temperature of FBC should be controlled within the range of **0～**0℃.
Either sand or original bed materials could be used as starting bed materials. If using the latter one, the max diameter of bed materials should be less than 3mm. If using former one, sand with low-density is preferred, in which could cause coking without controlling the capacity of Na and K— Na2O≤2.0%, K2O≤2.5%. Max diameter of particle≤6mm. And the mass volume of grain size that less than **0m should be no greater than *5%.
　　
2.1.2 Quality of steam and water
To ensure the quality of steam and water in outlet of the boiler, strict control of quality of steam and water in boiler should be applied, especially the quality of feeding water. The quality of feeding water, boiler water, attemperating water and steam should be in line with GB/T*********8, steam and water quality standard for thermal power’s and steam power’s equipment.

2.1.3 Main performance index
On the conditions that emission value, fuel, limestone and coefficient of excess air are fixed in 1.2, B-MCR and Ca/S mole ratio are fixed in 2.2.

item measurement unit         rated condition
computational efficiency(Qnet) ï¼… *8.

**6
ensuring efficiency(Qnet) ï¼… ≥*8
SO2 concentration of emission SO2 mg/Nm3 **0(Ca/S=2.2，O2=6%)
NOX concentration of emission NOX mg/Nm3 **0 (O2=6%)
CO concentration of emission CO mg/Nm3 **0 (O2=6%)

2.2 OPERATING CONDITION
This boiler has peak regulation ability with base load. As to designing and checking coal, the boiler could afford *0% ECR or more. And B-MCR is about 2ï¼…
On the bellowing condition, the temperature superheater steam is able to reach the rated parameters with deviation *5～**0℃, the operation in fixed pressure has *0％～**0ï¼…E-MCR. When stable pressure, the continual changing rate of load of boiler ≥7ï¼…B-MCR/min. The time between starting fire and fully load operation: cool starting ＜8h; warm starting ＜4h; hot starting＜2h.
Designing pressure of dense region in furnace: ＋*0.8kPa～－8.7kPaï¼›designing pressure in upper part of furnace: ±8.7kPa.