YINENG PRODUCTS

WNS Oil/Gas-Fired Condensing Steam Boiler

Model / Series WNS

A two-pass wet-back shell boiler with economizer and condenser. Evaporation is 1–20 t/h and design efficiency 100.2–100.5%.

Atomized fuel burns in the corrugated furnace and transfers radiant heat in the first pass. Gas turns in the reversal chamber into second-pass threaded smoke tubes, reaches the front smokebox and passes successively through the economizer and condenser before chimney discharge.

Design and features

Hinged smokebox

A hinged smokebox supports inspection and cleaning while improving sealing.

Corrugated furnace

Corrugations increase heating surface and disturb gas flow for heat transfer, improve furnace flexibility and strength, and reduce thermal-expansion stress.

Threaded smoke tubes

Threaded tubes increase heating area and flue-gas residence time within limited space. Heat-transfer performance is 1.3 times that of ordinary smoke tubes.

Condensing heat recovery

Recovers flue-gas heat to warm feedwater and reduce exhaust temperature. Finned tubes increase heating area; an ND-steel condenser resists low-temperature corrosion.

Calculation basis: lower heating values of 8400 kcal/Nm³ for natural gas and 10250 kcal/kg for diesel. Y denotes oil firing and Q denotes gas firing.

PRODUCT DATA

Specifications

WNS Fully Automatic Oil/Gas-Fired Condensing Steam Boiler
Boiler model			WNS1	WNS1.5	WNS2	WNS3	WNS4	WNS6	WNS8	WNS10	WNS15	WNS20
Rated evaporation		t/h	1	1.5	2	3	4	6	8	10	15	20
Rated steam pressure		MPa	1.25（1.6）
Rated steam temperature		℃	194（204）
Rated feedwater temperature		℃	20					20（104）
Boiler body heating surface		m2	19.3	27.9	36.5	54.8	62.3	112	125	165	237	290
Economizer heating surface		m2	5.9	8.9	11.9	19.9	25.6	32.5	42.3	48.9	85.5	109
Condenser heating surface		m2	7.9	13.9	19.9	25	32.2	43.6	56.6	81.9	150	192
Design thermal efficiency		%	100.3	100.2	100.2	100.3	100.2	100.2	100.2	100.2	100.5	100.4
Design ambient temperature		℃	20
Boiler net weight		t	4.8	6.5	7.8	8.8	11.6	14.1	17.9	21.8	31	38
Boiler operating water capacity		t	3.1	4	5.2	6.8	9	12.8	16.3	20.7	30.5	37.1
Boiler full-water capacity		t	3.6	4.5	6.1	7.9	10.5	14.4	19.4	24.1	34.1	41
Boiler feedwater control			On/off feedwater control					Modulating feedwater control
Combustion mode			Slight-positive-pressure chamber combustion
Natural gas		Nm3/h	70.2	105.6	140.5	211.1	281.4	422.1	562.5	705.6	1055.4	1410.1
Diesel		kg/h	60.4	90.2	121.4	181.1	239.5	362.1	479.6	601.5	902.8	1205.1
Transport dimensions	Length	mm	3850	4080	4250	4690	5250	6100	6210	6853	7430	7890
	Width		1900	2000	2100	2350	2540	2600	2920	3110	3550	3750
	Height		2110	2240	2450	2580	2800	2980	3280	3460	3800	4050
Installation dimensions	Length	mm	4630	4750	5100	5680	6350	7450	7700	8230	9380	9700
	Width		2800	2990	3000	3250	3440	3500	3820	4010	4350	4550
	Height		3200	3560	3720	3850	4120	4350	5000	5200	5600	6100
Feedwater connection	DN	mm	32	32	40	40	40	40	50	50	65	65
Main steam outlet	DN	mm	50	65	100	80	100	125	150	150	200	200