Low Pressure Coal Fired Steam Boiler

Rated steam output: 1-20ton/hr
Rated working pressure: 0.7-2.5Mpa
Fuel type: anthracite coal, meagre coal, lignitous coal, bituminous coal

Application

The low pressure coal fired steam boiler is an assembled boiler. The boiler and its base are transported separately and it needs to be assembled by the customer on site. We can provide technicians to supply on-site installation and debugging services for customers.

The boiler is fueled by coal and it effectively heats the water within, evaporating it so that it can condense within a heat exchanger and the cycle continues. It can provide heat for manufacturing equipment or as generalized heating in large structures.

The steam boiler is widely used in industry, and its main applications include:

Food industry: The steam can be used for cleaning, and can be used for heating, drying or disinfecting food.

Spinning, printing and dyeing industry: used for some production links such as dyeing, rinsing, drying and shaping cloth.

Biological medicine industry: used for heating reaction kettles, condensation reaction, exchanging heat and disinfecting of chemical reaction systems.

Hospital: used for disinfecting, heating, and air conditioning.

Petrochemical Industry: used for heating oil and increasing liquidity.

Wood furniture industry: used for drying wood, brick and so on

Papermaking industry: high pressure steam is used to drive power generation. The steam after decompressing is used for drying, and the last low pressure steam is used for deinking or pulping and making paper.

Tobacco industry: provide heat for making pipe tobacco and baking.


Technical parameters:

Type	Rated steam output（ t/h ）	Rated working pressure( Mpa)	Rated steam temperature(℃)	Rated boiler volume( m3 )	Design thermal efficiency( % )	Fuel consumption( kg/h )	Maximum dimension of shipping part( m)	Maximum weight of shipping part( t )	Overall size after installation( m )
SZL1-0.7	1	0.7	20	3.6	＞ 76	167.9	5.2 × 2.1 × 2.9	13	6.0 × 4.2 × 4.2
SZL1-1.0		1.4
SZL2-1.25	2	1.25	20	6.5	＞ 78	327.1	5.7 × 2.6 × 3.4	21	6.5 × 4.5 × 4.8
SZL2-1.6		1.6
SZL2-2.5		2.5
SZL4-1.25	4	1.25	20	9.2	＞ 78	654.2	6.6 × 2.7 × 3.6	27	7.2 × 4.1 × 4.9
SZL4-1.6		1.6
SZL4-2.5		2.5
SZL6-1.25	6	1.25	20	12.3	＞ 78	981.3	6.5 × 2.7 × 3.6	25	9.5 × 5.5 × 6.3
SZL6-1.6		1.6
SZL10-1.25	10	1.25	20	1.0	＞ 80	1594.7	7.2 × 3.4 × 3.6	33	9.8 × 5.7 × 6.3
SZL10-1.6		1.6		1.25
SZL15-1.25	15	1.25	20	1.0	＞ 80	2392	9.4 × 3.4 × 3.6	42	10.7 × 5.7 × 6.8
SZL15-1.6		1.6		1.25
SZL20-1.25	20	1.25	20	1.25	＞ 80	3189.3	9.8 × 3.5 × 3.6	27	11 × 5.8 × 8.6
SZL20-1.6		1.6

Manufacturing process feature

The steam boiler has complex processing links, and the fine processing is an important factor of product quality and customer safety during use.
1. Boiler material: seamless steel pipe
2. Welding process: Argon arc welding and radiographic testing will be used.
3. Bending shaping: the tube is shaped after bending in pipe bending machine to ensure the accuracy of coil’s outline dimension satisfies GB/T17410 standard.
4. Water pressure testing: After shaping, the water pressure test of tube is carried out before leaving the factory.

System composition

The industrial boiler is a natural circulation boiler so discharging sewage does not require an external circulation pump. The boiler consists of a heated surface and grate. The end part of the boiler is equipped with an economizer and air per-heater. The boiler features a water circulation system, flue gas system, ash system, and blowing system.

1. Boiler heated surface
The boiler heated surface consists of a steam drum, water drum, header, water wall and convection tube bundle. Water drum is equipped with sewage device.

2. Grate
The boiler uses chain grate and wind blows from the bottom. There are 6 independent wind chambers under the grate, which can be adjusted according to the user combustion conditions to save electricity.

3. Economizer
The economizer is placed at the tail of boiler, which is used to recover the residual heat of flue gas. When the temperature of exhaust gas is too high, the economizer can reduce the temperature and can save fuel.

4. Air per-heater
The air pre-heater can heat the air before entering the boiler and improve combustion efficiency.

5. Water circulation system
Water source—pump—economizer—drum—downcomer-- water drum-- riser tube-- steam drum-- steam outlet

6. Ash system
The fuel ash after burning is discharged by the slag extractor at the end of grate, ash not timely discharged will fall into front ash bucket with chain grate running. So users need to clean regularly.