Thermal Power Plant 30mw Coal-fired Boiler VS Biomass Boiler

 Necessary Document in preliminary Offer:

•Technical description of Boiler

•Technical parameters, outside and inside, including:

- Quantity of biomass and Coal (ton/h),

- Quality and quantity of water to the Boiler,

- Include the diesel start system

- Scope of biomass and coal handling system

Scope of supply

Separately price for each item

Time of delivery – erection

PID drawings

The control system will use electric way, not pneumatic control.

Thermal Power Plant Boiler

The Total Offer will be include:

•Technical proposal.

•Calculation chose Equipment.

•Equipment Catalog

•Drawing for construction

•O&M document

•Spare parts for 2 years

•Guarantee 24 months

Offer of Boiler with following request data:

1-BOILER MAIN DATA:

No	Operation design parameter	Value	Units
1	Operation hours in year	8,000	hours
2	Number of Boilers	1	u
3	Steam production for one boiler (nominal flow)	120	t/hr.
4	Superheat steam parameter (nominal flow)	8.5	Mpa
		520	ºC
5	Used fuel: Coal and Biomass in following proportion:
	1- Coal burn alone, between 60 % to 100 % of steam flow – From 72  to 120 t/h steam
	2- Biomass to support coal, until proportion 40% biomass and 60% coal         From 72 to 120 t/h steam using both fuels in proportion 40/60 %
6	Separated feed system for Coal and Biomass, the fuels go separately to the furnace and inlet in different levels to burn together inside.
7	Start fuel: use Light fuel oil
8	Automatic regulation of Boiler, between	40-100	% MCR
9	Minimum Boiler charge with Biomass or Coal	60	% MCR

2-ASSUMED BOILER GUARANTEES:

a)Main steam pressure

8,5 Mpa abs measured at the superheaters outlet after blind valve, with a tolerance of ± 0.05 Mpa.

b) Steam temperature measured directly downstream the superheater’s blind valve.

520 °C with tolerance of –5°C and +5°C for a main stream generation over flow range at 72 t/h (60%)

c) Steam generation, without tolerance, achieved 24 hours/24 under automatic control

120 t/h main steam

d) Environmental operation condition:

Concentration of SOx, 425 mg/Nm3

Concentration of NOx 552 mg/Nm3

Dust concentration outlet of Chimney 200 mg/Nm3

e) Steam quality

Location	Parameter	Expected range	Limit value
Live steam	cationic cond. (mS/cm (25°C))	0,06 – 0,2	0,2
	sodium (mg/kg)	0-5	5
	silica(mg/kg)	3 – 5	20
	iron (mg/kg)	2 – 5	20
	copper(mg/kg)	0 – 1	3

3-BOILER FUEL DATA

3.1     LIGH OIL FUEL
Characteristic of Light Oil grade ASTM No. 2 with heat value 10.800 kcal/kg, belong to oil grade
No.	SPECIFICATION	UNIT	LIMIT	TEST METHOD
1	Heat value	Kcal/kg	≥ 10 800
2	Sulfur content, max	% wt	0.05- 0.25	ASTM D4294-03
3	Cetan index , min	-	46	ASTM D976-04a
4	Batch distillation component: 90% reclaim, max	0C	360	ASTM D86-04b
5	Flash point, min	0C	55	ASTM D93-02a
6	Kinematics viscosity at 400C	cSt  (0E)	40-60 (2-2.5)	ASTM D445-04ε1
7	Carbon residue of 10% distillation residue	% wt	0.3	ASTM D198-01
				/ D4530-03
8	Pour point, max	0C	6	ASTM D97-04
9	Ash content, max	% wt	0.01	ASTM D482-03
10	Water by distillation, max	mg/kg	200	ASTM E203
11	Granular admixture, max	mg/l	10	ASTM D2276-00
12	Cu corrosion at 500C/3h, max	number	1	ASTM D130-04
13	Density at 150C	kg/l	0.820÷0.860	ASTM D1298-99ε2
14	Lublicity, max	μm	460	ASTM D6079-04
15	External view	-	Clean, crystal	Check by sight

  

3.3      COAL
No	SPECIFICATION	UNIT	LIMIT
Coal Analysis
No	Basis	Unit	Air Dried	Dry	Dry Ash Free	As Received
	Abbreviation		ADB	DB	DAF	AR
1	Total Moisture	%	-	0	-	4.00
2	Inherent Moisture	%		-	-	1.10
3	Ash Content	%		30.40	-	29.20
4	Volatile Matter	%		8.80		8.45
5	Fixed Carbon	%		60.80		58.35
6	Gross Calorific Value	Cal/g		5505		5285
7	Net Calorific Value	Cal/g		5000
8	Carbon – C	%		51.09
9	Hydrogen – H	%		0.13
10	Nitrogen – N	%		0.45
11	Oxygen – O	%		1.70
12	Total Sulphur – S	%		1.31		1.26
13	Combustible Sulphur	%		1.55
14	Chlorine – Cl	%		Not Detected LOD = 20ppm
15	Mercury – Hg	%		Not Detected LOD = 20ppm
16	Phosphorus – P	%		0.06
17	Total minerals in coal	%		50.10
18	Total minerals in ash	%		5.30
19	Coal size		0-5 mm	5-20 mm	20 – 50 mm
20	Coal Fraction	mm	58.6	29.60	11.80
	Ash Analysis	%
1	Na2O	%	0.37
2	MgO	%	2.32
3	Al2O4	%	18.48
4	SiO3	%	53.85
5	P2O6	%	0.36
6	SO4	%	4.55
7	Cl	ppm	<10
8	K2O	%	3.21
9	CaO	%	5.88
10	TiO3	%	0.65
11	Loss on Ignition	%	0
12	V2O6	ppm	483
13	Cr2O4	ppm	148
14	MnO	ppm	<10
15	Fe2O3 Total	%	9.99
16	NiO	ppm	<10
17	CuO	ppm	<10
18	ZnO	ppm	<10
19	RbO3	ppm	257
20	SrO	ppm	563
21	ZrO3	ppm	<10
	Coal Ash Fusibility
	Deformation Temperature	°C	1160
	Initial Deformation Temperature	°C	1083
	Sphere Temperature	°C	1240
	Hemispherical Temperature	°C	1280
	Flow Temperature	°C	1330

 

3.4  BIOMASS SPECIFICATION – Sugar cane bagaze
No	Parameters	Units	Value
1	Total moisture	%wt	50
3	Gross cal. Value	kcal/kg	4,200
6	Ash content (on dry basic)	%wt	4.0