Oil (gas) boilers

Product Introduction:

This boiler features a D-type layout, natural circulation, double-drum water-tube design, longitudinally arranged drums, a fully membrane-type water-cooled wall structure, and slightly positive pressure combustion. The furnace is enclosed by a membrane wall. Flue gas enters the convection tube bundle connecting the upper and lower drums from the furnace outlet. After passing through the convection tube bundle, the flue gas enters the tail heating surface—the ND steel spiral fin economizer and condenser—and finally exits into the atmosphere through the flue and chimney.

 

Performance Characteristics:

1. Full membrane wall structure, airtight design, low flue gas heat loss, and high thermal efficiency;

2. Compact structure, small installation volume, saving investment;

3. Steam boilers use natural circulation with a large cross-sectional ratio, while hot water boilers use forced circulation, ensuring safe and reliable water circulation;

4. Equipped with well-known high-efficiency burners and auxiliary equipment, achieving fully automatic operation;

5. Feedwater pump uses continuous electric regulation and has high and low water level alarm interlock protection functions;

6. The furnace is equipped with inspection holes, greatly facilitating use and maintenance, and the furnace top is equipped with an explosion-proof door.

 

Working Principle:

In boiler flue gas heat loss, besides the sensible heat, water vapor also carries away a significant amount of latent heat of vaporization. If the flue gas temperature is lowered, allowing all or part of the water vapor in the flue gas to condense, and the latent heat released during condensation to be recovered and utilized, the boiler’s effective heat utilization increases, significantly improving its thermal efficiency.

 

The WNS-type low-NOx condensing gas-fired boiler addresses key technical factors such as the relationship between the condensation rate of water vapor in flue gas and the exhaust gas temperature, the relationship between the condensation rate and thermal efficiency, and the corrosion rate of condensate on different steel grades. Through rational design of the heating surface, it reduces the exhaust gas temperature and ensures that the water vapor in the flue gas achieves the designed condensation rate, thus significantly improving the boiler’s thermal efficiency.

Due to the adoption of a large-size furnace structure and flue gas recirculation technology, ultra-low NOx emissions can be achieved for this gas-fired boiler, with NOx emissions ≤30mg/Nm3.

 

Boiler Model/Project			SZS10	SZS15	SZS20	SZS25	SZS30	SZS35	SZS40
Rated Evaporation Capacity		t/h	10	15	20	25	30	35	40
Rated Steam Pressure		MPa	1.25/1.6	1.25/1.6	1.25/1.6	1.25/1.6	1.25/1.6	1.25/1.6	1.25/1.6
Rated Steam Temperature		℃	194/204	194/204	194/204	194/204	194/204	194/204	194/204
Rated Feedwater Temperature		℃	20(104)	20(104)	104	104	104	104	104
Calculated Heat Exchange Area		m2	357.7	524	702.5	805.2	905.2	1052	1208
Design Thermal Efficiency (Oil/Gas)		％	98.48/99.35	98.4/99.3	98.34/99.15	98.1/99.48	98.2/99.2	98.6/99.4	98.64/99.5
Maximum Transport Weight of Boiler Components		t	30	40	46.3	52	55.7	68	76
Boiler Water Capacity		t	10.1	14.7	16.9	18.9	21.6	23.8	27.7
Combustion Method		Combustion chamber
Combustion Control Method		Fully automatic proportional control
Applicable Fuel		Natural gas, light diesel oil, coke oven gas
Fuel Consumption	Natural gas	Nm3/h	805	1195	1600.7	1972	2190	3060	3060
	Light diesel	Kg/h	663	986	1319.1	1598	1860	2540	2540
Alimentation électrique		380V/50Hz
Water Pump	Electric power	KW	15	15	18.5	30	37	45	45
Circulating Water Pump	Electric power	KW	1.5	1.5	3	3	3	4.5	4.5
Fan	Electric power	KW	22	30	45	75	90	110	110
Maximum shipment dimensions		mm	7490×2790	9120×3375	10050×3330	10200×3800	10000×4030	11000×4300	12000×4300
			×3516	×3566	×4066	×4150	×4230	×4230	×4530