ZBG group SZS series 7MW automatic gas hot water boiler

 1 Design conditions

1. The hottest month of the year (July) has an average temperature of 23.0°C
2. The coldest month of the year (January) average temperature -18.7℃
3. The annual absolute maximum temperature is 37.4°C
4. Annual absolute minimum temperature -36.2℃
5. The annual average temperature is 3.8℃
6. Annual average relative humidity 72%
7. The average annual rainfall is 438.1mm
8. Annual maximum wind speed 28.5m/s
9. Annual average wind speed 3.8m/s
10. The dominant wind direction in summer is S
11. Dominant wind direction in winter NW
12. Snow thickness 22cm
13. Freezing depth 230cm
14. Heating outdoor calculated temperature -24.2℃
15. Average temperature during heating period -9.9℃

2 Scope of supply

Quantity: 2 sets (one with economizer, one without economizer)

The supplier provides the body and accessories of the fully automatic gas hot water boiler, mainly including:

• Steel frame and guard plate, furnace wall and insulation, rear smoke box.
• Various materials required for platform escalator and boiler masonry, etc.
• The primary valve instrument connected to the furnace body (supplied according to the boiler piping system diagram).

3 Boiler form and technical parameters and requirements

The boiler furnace type is a fully automatic gas-fired hot water water tube boiler, with double drums for natural circulation, reliable explosion-proof devices, and reliable drainage measures for the furnace and convection heating surfaces. According to the on-site installation space of the boiler room, a horizontal boiler is adopted.

The project uses natural gas as the design fuel, and the fuel analysis is as follows:

	C1	C2	C3	iC4	nC4	iC5	nC5	C6+	CO2	N2
high limit	0.8738	0.0525	0.0376	2.3954E-03	4.7449E-03	2.4917E-04	3.8765E-04	5.1306E-05	0.0125	0.0158
lower limit	0.9487	0.0194	3.3545E-03	9.7675E-05	1.8354E-04	4.5362E-06	6.2662E-06	1.4649E-07	0.0133	0.0151

Natural gas components:

Boiler parameters and requirements:

1) Boiler type: gas hot water tube boiler

2) Rated heating load: 7MW

3) Rated working pressure: 1.0MPa

4) Rated outlet/return water temperature: 115/70℃

5) Exhaust gas temperature: <150°C

6) Boiler design efficiency: ≥92%

7) Boiler combustion method: micro positive pressure

8) Boiler seismic intensity: 7 degrees

3.2 Boiler body:

The boiler body includes furnace wall, insulation, boiler frame and guard plate, platform escalator and other components.

The outside of the boiler body adopts colored decorative panels. Stainless steel bead.

3.3 Safety valve:

The selection of safety valves and other valves shall meet the requirements of ASME codes or codes acceptable to the owner. In order to ensure the safe operation of the boiler, the number, characteristics and discharge calculation of safety valves shall be explained in detail. The safety valve should be equipped with devices or measures to prevent the safety valve from deviating from the set value after adjustment.

Provide tools for pressing the safety valve during the boiler hydrostatic test.