Biomass Chain Grate Steam Boiler

 

The Biomass chain grate steam boiler is a high-efficiency thermal energy equipment designed specifically for large-scale industrial heating needs. Utilizing mature chain grate combustion technology, it uses various biomass briquettes or pre-treated biomass fragments as primary fuels, stably and efficiently converting biomass energy into continuous and reliable steam heat energy. The Biomass chain grate steam boiler is an ideal choice to replace traditional coal-fired boilers, achieving a green energy structure transformation, reducing carbon emissions, and lowering operating costs.

 

 

• Fuel Supply:Biomass fuel, after crushing and screening, is evenly spread at the front end of a slowly moving chain grate by a feeder.
• Preheating and Drying: Under the radiant heat of the front arch and the action of primary hot air, the fuel moisture evaporates, and the temperature rises to the ignition point.
• Volatile Matter Release and Combustion:Entering the main combustion zone, a large amount of volatile matter is released and intensely mixed with secondary air for combustion, maintaining the furnace temperature at 900–1100°C.
• Coke Combustion:Fixed carbon continues to burn in the middle and rear sections of the grate, while ash and slag move with the chain grate to the tail end, falling into the slag remover for cooling and discharge.
• Flue Gas Heat Exchange: High-temperature flue gas flows sequentially through the furnace radiant zone, slag-collecting tubes, convection tube bundles, and economizer, decreasing in temperature to 140–160°C before entering the dust removal and desulfurization system.

 

 

Steam boiler models		DZU/DZG 1	DZL/DZG 2	DZL/DZG 4	DZL/DZG 6	DZL/DZG 10	DZL/DZG 15	DZL/DZG 20
Rated Evaporation Capacity (t/h)		1	2	4	6	10	15	20
Rated Working Pressure (MPa)		0.7/1.0	1.25/1.6/2.5	1.25/1.6/2.5	1.25/1.6	1.25/1.6	1.25/1.6	1.25/1.6
Rated Steam Temperature (°C)		170/184	193/204/226	193/204/226	193/204	193/204	193/204	193/204
Feedwater Temperature(°C)		20	20	20	20	20	20	20
Body Water Volume(m3)		3.6	6.5	9.2	12.3	1.0/1.25	1.0/1.25	1.25
Design Thermal Efficiency (%)		≥81	≥81	≥81	≥81	≥81	≥81	≥81
Applicable Fuel		Category II bituminous coal	Category II bituminous coal	Category II bituminous coal	Category II bituminous coal	Category II bituminous coal	Category II bituminous coal	Category II bituminous coal
Fuel Consumption (kg/h)		167.9	327.1	654.2	981.3	1594.7	2392.0	3189.3
Maximum Transport Component Size (m)		5.2×2.1×2.9	5.7×2.6×3.4	6.6×2.7×3.6	6.5×2.7×3.6	7.2×3.4×3.6	9.4×3.4×3.6	9.8×3.5×3.6
Maximum Transport Component Weight (t)		13	21	27	25	33	42	27
Installation Dimensions (m)		6.0×4.2×4.2	6.5×4.5×4.8	7.2×4.1×4.9	9.5×5.5×6.3	9.8×5.7×6.3	10.7×5.7×6.8	11×5.8×8.6
Exhaust fan	Model	GY1-11Right0°	GY2-15Right0°	YX9-35No.8CRight0°	GY6-1Right0°	GY10-15Right0°	Y5-47 12DRight0°	Y5-47 12.4Right0°
	Air volume(m3/h)	3295-5100	5200-8500	8868-19342	14000-20000	26321-32138	33318-50356	36762-55561
	Air pressure(Pa)	2383-2079	3668-3020	2805-3041	3060-3320	3714-3802	3628-3393	3874-3619
	Motor power(KW)	5.5	11	18.5	30	55	75	90
Blower fan	Model	4-72-3.2ARight 225°	GG2-11Right 225°	T4-72 4.5Right 225°	T4-72 5Right 225°	GG10-1Right 225°	G4-73 9DRight 225°	G4-73 9DRight 225°
	Air volume(m3/h)	1688-3517	3189-4130	5360-10288	7352-10249	10000-22500	23003-32079	23003-44128
	Air pressure(Pa)	792-1300	1578-1461	2582-1616	3195-2954	2690-1620	2668-2559	2668-1775
	Motor power(KW)	2.2	3	7.5	11	15	30	37
Water pump	Model	25W2.5-12	JGGC2.4-9×19	DG6-25×7	DG6-25×8	DG12-25×7	DG25-30×5	DG25-30×6
		25W2.5-12	JGGC2.4-9×22	DG6-25×8	DG6-25×9	DG12-25×8	DG25-30×6	DG25-30×7
			DG6-25×11	DG6-25×12
	Flow rate(m3/h)	2.5	2.4/2.4/3.75	3.75-7.5	3.75-7.5	7.5-15	15-30	15-30
	Head(m)	120	152/176/280	175/200/300	200/250	175/200	150/180	180/210
	Motor power(KW)	3	3/3/15	7.5/11/15	11/15	15/15	22/30	30/30
Speed control box	Model	GL-5P	GL-5P	GL-5P	GL-10P	GL-16P	GL-20P/II	GL-20P/II
	Motor power(KW)	0.55	0.55	0.55	0.75	1.1	1.5	1.5
Slag remover	Model	LXL-1	LXL-2	LXL-4	LXL-6	LXL-10	LXL-15	LXL-20
	Motor power(KW)	0.75	1.1	1.1	1.1	1.1	1.5	1.5
Dust collector model		XD-1	XD-2	XD-4	XD-6	XD-10	XD-15	XD-20

 

 

• High-efficiency combustion, wide fuel adaptability: Utilizing a heat-resistant cast steel chain grate, it achieves stable fuel delivery and segmented air supply. Combined with an optimized furnace, it ensures that biomass fuel undergoes a complete combustion process, achieving a thermal efficiency of over 88%.
• Stable operation, high degree of automation: The mechanical grate achieves continuous and uniform feeding and ash removal, ensuring stable steam output. An integrated intelligent control system automatically monitors and adjusts key parameters, featuring one-button start/stop and remote monitoring functions, making operation simple, safe, and reliable.
• High-efficiency heat transfer, durable design: Scientifically arranged radiant and convective heating surfaces optimize flue gas flow for full heat absorption. Employing enhanced heat transfer and anti-wear processes effectively combats corrosion and wear from biomass flue gas, extending service life.
• Environmentally friendly and economical, significant advantages: Low sulfur and nitrogen content in the fuel, combined with low-NOx combustion and efficient dust removal, easily meets stringent environmental standards. As a renewable resource, it offers carbon neutrality benefits. Operating costs are significantly lower than oil and gas, resulting in outstanding overall benefits.

 

 

 

A. Daily Maintenance:

Check the grate bars for tightness and remove any obstructing foreign objects.

Confirm the visibility and function of the water level gauge, pressure gauge, and safety valve.

Check the operation of the ash removal system and ensure the water seal level.

B. Periodic Maintenance:

Weekly: Clean ash buildup in the convection tube bundles and check for scale buildup on the economizer flue side.

Monthly: Verify the safety valve's opening pressure, clean deposits from the feeder, and check the grate tension.

Annual: Perform a hydrostatic test, internal and external inspections, replace worn grate bars, and check the wall thickness of the heating surface tubes.

C. Lifespan of Key Wear Components:

Grate Bars: 8,000–12,000 operating hours

Refractory Materials: 3–5 years

Dust Collector Bags: 2–3 years

 

 

• Wide Fuel Adaptability: Can handle biomass fuels with high moisture content, low calorific value, and high ash content, requiring no expensive pretreatment.
• Low Operating Costs: Fuel costs are reduced by 40-70% compared to oil/gas-fired boilers; ash can be sold to offset costs.
• High Automation: One-button start/stop, unattended operation for up to 8 hours, reducing the need for manual ash removal.
• Flexible Load Adjustment: Can operate stably within a 30-110% rated load range, adapting to intermittent production needs.
• Carbon Neutral Properties: CO₂ released from biomass combustion originates from plant photosynthesis, resulting in zero net carbon emissions, complying with CDM/CCER carbon trading mechanisms.

 

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