Low Pressure Coal Fired Hot Water Boiler
Rated steam output: 0.7-14ton/hr
Rated working pressure: 0.7-1.25Mpa
Fuel type: anthracite coal, meagre coal, lignitous coal, bituminous coal
This boiler is an assembled boiler, meaning the boiler and its base are shipped separately and need to be assembled at the customer’s site. If needed, we will send technicians to the customer’s location for installation and debugging. As a low pressure boiler, it uses coal as fuel, and is widely used in factories, hotels, hospitals, office buildings, schools and markets.
| Type | Rated thermal power ( t/h ) | Rated working pressure ( Mpa ) | Water outlet temperature (℃) | Boiler volume( m3 ) | Water inlet temperature (℃) | Design thermal efficiency ( % ) | Fuel consumption( kg/h ) | Maximum dimension of shipping part ( m ) | Maximum weight of shipping part ( t ) | Boiler installation dimension ( m ) |
| 0.7 | 0.7 | 95 | 70 | 3.6 | ＞ 76 | 162.4 | 5.2 × 2.1 × 2.9 | 13 | 6.0 × 4.2 × 4.2 | |
| 1.4 | 0.7/1.0 | 95/115 | 70 | 6.5 | ＞ 78 | 327.1 | 5.7 × 2.6 × 3.4 | 21 | 6.5 × 4.5 × 4.8 | |
| 2.8 | 0.7/1.0 | 95/115 | 70 | 9.2 | ＞ 79 | 654.2 | 6.6 × 2.7 × 3.6 | 27 | 7.2 × 4.1 × 4.9 | |
| 4.2 | 0.7/1.0 | 95/115 | 70 | 12.3 | ＞ 81 | 981.3 | 6.5 × 2.7 × 3.6 | 25 | 9.5 × 5.5 × 6.3 | |
| 7 | 1 | 95/115 | 70 | 1.0/1.25 | ＞ 81 | 1594.7 | 7.2 × 3.4 × 3.6 | 33 | 9.5 × 5.7 × 6.3 | |
| 10.5 | 1 | 95/115 | 70 | 1.0/1.25 | ＞ 81 | 2392 | 9.4 × 3.4 × 3.6 | 42 | 9.4 × 3.4 × 3.6 | |
| 14 | 1.0/1.25 | 115/130 | 70 | 1.25 | ＞ 81 | 3189.3 | 9.8 × 3.5 × 3.6 | 27 | 9.8 × 3.5 × 3.6 |
The hot water boiler has complex processing links, and the fine processing is an important factor of product quality and customer’s safe use.
The steam boiler features complex processing links, and utilizes fine processing, which is an important factor in final product quality and safe usage by the customer.
1. Boiler material: seamless steel pipe
2. Welding process: Argon arc welding and radiographic testing
3. Bending shaping: The tube is shaped after the bending process in the pipe bending machine in order to ensure the coil outline dimension accuracy and ensure it meets GB/T17410 standards.
4. Water pressure testing: After shaping, the water pressure test for the tube is carried out before the boiler leaves the factory.
The low pressure industrial boiler is a natural circulation boiler that requires no external circulation pump for the discharge of sewage. It consists of the heated surface and a grate, with an economizer and air pre-heater equipped on the end. The boiler also has a water circulation system, flue gas system, ash system and blowing system.
1. Boiler heated surface
The boiler heated surface consists of the steam drum, water drum, header, water wall and convection tube bundle. The water drum is also outfitted with a sewage device.
2. Grate
The boiler uses a chain grate with wind blowing from the bottom. There are 6 independent wind chambers in the grate, which can be adjusted based on user combustion conditions in order to save electricity.
3. Economizer
The economizer is placed on the tail end of the boiler, and is used to recover residual heat from the flue gas. When the temperature of the exhaust gas is too high, the economizer will reduce the temperature and save fuel.
4. Air per-heater
The air pre-heater can heat the air before it enters the boiler, and thus, improve the boiler’s combustion efficiency.
5. Water circulation system
Water source—pump—economizer—drum—downcomer-- water drum-- riser tube-- steam drum-- steam outlet
6. Ash system
After fuel burning, the resulting ash will be discharged using a slag extractor at the end of the grate. Ash that isn’t quickly discharged will fall into the front ash bucket with the chain grate running. This means users do need to regularly clean the grate.
