Coal-Fired Boiler

Chain grate boilers are an industrial heating solution that allows for efficient, continuous operation by moving fuel through the boiler on a conveyor belt-like grate. As the fuel progresses, it ignites and burns, generating heat to produce steam from the water within the boiler. This can be achieved either directly (in fire tube boilers) or indirectly (in water tube boilers).

However, it's important to note that chain grate boilers lack the capacity for in-furnace desulfurization, a feature present in fluidized bed boilers. This means that they emit sulfur oxides (SOx) in the flue gas, contributing to atmospheric pollution. Moreover, they can struggle with inconsistent combustion and adapting to different types of coal, affecting their efficiency. Lastly, high furnace temperatures in these boilers can lead to the production of nitrogen oxides (NOx), another pollutant that can negatively impact the environment. Regular maintenance is also essential to prevent the build-up of ash and other combustion by-products that can impact efficiency.

The water and steam are separated into two drums. The lower drum, known as the water drum, is where water is heated and rises as steam into the upper drum. This arrangement allows for a more efficient heat recovery as the water and steam are kept separate, reducing heat loss. They are generally larger and more complex to install and maintain but are often more efficient and offer higher capacities.

Simple term of double-drum coal-fired boiler is like a two-pot cooking setup. One "pot" or drum heats the water, and then the steam moves to the second drum. This allows it to create more heat more efficiently, but it's a bigger machine and needs more space.

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Model
			SZL6-1.25-A ||	SZL8-1.25-A ||	SZL10-1.25-A ||	SZL12-1.25-A ||	SZL15-1.25-A ||	SZL20-1.25-A ||
Specification	Rated evaporation	t/h	6	8	10	12	15	20
	Rated steam pressure	MPa	1.25/1.6
	Rated steam temperature	℃	193/204
	Water temperature	℃	20/105
	Design thermal efficiency	%	>80
	Fuel consumption	kg/h	1013	1350	1668	2025	2530	3375
	Blower		GG6-15	GG8-15	GG10-15	GG15-15		GG20-15
	Fan		GY6-15	GY8-15	GY10-15	GY15-15		GY20-15
	Governor box type		GP-10P	GL-16P		GL-20P
	Slag way		Shave plate-type/ Spiral
	Precipitator		Cyclone dust removal/Water film dust removal
Pump	Input power	kW	7.5	11	15	18.5	22	30
Heated surface	Ontology	m³	209.2	255	298	370	438	568
	Economizer	m³	65.6	130.8	174.4	218	354	413
Pipe	Main steam valve diameter	DN	125	150		200		250
	Water inlet diameter	DN	40	50			80
	Safety valve diameter	DN	80*1/50	80*2			100*2
	Blowoff valve diameter	DN	50/40
	Chimney	Φmm	600	700	800	900	1000	1200
Overall size	Weight	t/h	71	85	100	125	150	175
	Length	m	8.9	8.5	10.7	11	12	13.2
	Width	m	3.2	2.8	3.5			3.7
	Height	m	6	5.6	6			6.8