SZL series biomass-fired steam boiler

Introduction

SZL series biomass-fired steam boiler is package or shop-assembled water tube boiler with double steam drum and chain grate stoker structure. 4-6 tph boiler is package boiler and 6-35 tph is shop-assembled structure, which is composed of 2 parts, upper part is heat absorbing surface and lower part is combustion equipment. The former part of boiler body is surrounded by membrane wall, its upper part connects with boiler drum and lower part connects with header, which forms a combustion chamber to absorb the radiated heat from furnace; there are dense convection tube bundle between the back side of upper and lower drum, the high temperature smoke enters a separate economizer after flushing heat absorbing surface then discharge from chimney.

- Product Features:

1 After simplifying the water-cycle route, we can reduce the water-cycle resistance, raise ascending tube velocity, improve the stability of the water cycle and ensure a safe and stable operation.
2 Design enough heating surface, which makes more heat from fuel absorbed. Flue smoke temperature can be lower than 170ºC.
3 Reasonably design front and back arch to improve the temperature in the furnace. We also strengthen the disturbance of smoke in the high temperature area. These reduce heat lose and fly ash loss as a result of incomplete combustion.
4 We adopt light chain grate and independent air chamber. We strengthen the seal airtight of the two sides of chain grates. These make the fuel burn fast and fully.
5 Our boiler have a large convection heating surface, a stable performance and even a long time overload work. What's more, we design the convection tube bundles in alternate permutation instead of in line arrangement. All of these designs make our boilers obtain a higher heat efficiency than normal, up to 81%.
6 We design double side air inlet and independent air plenum. And at the exit of furnace, we set up a smoke separation device by inertia, which makes the original discharging dust concentration lower than 1800 mg/Nm3. Our high efficiency dust collector makes sure the dust removal efficiency up t0 90%, SOX and NOX removal efficiency up to 98%. These measures can meet the global demands and standards of environmental protection.
7 Compact structures are designed, except the 4t/h and 6 t/h packaged steam boiler. That can save boiler house and reduce the installation workload and time.
8 We enlarge the diameter of steam drum to supply a big space of water-steam separation device. So that we can offer steam in good quality.
9 High automatization, safe and easy operation. In the electrical control cabinet, we design automatic feeding water, alarm and safety interlock of high/low water level, air blower and draft fan.

- Control and safety systems

1. Alarm system
1.1 Sound-light alarm of high and super-high steam pressure;
1.2 Sound-light alarm of high and lowe water limit level;
1.3 Sound-light alarm of pressure loss in the water pumps;
1.4 More safety devices are designed and connected with the electric control cabinet (ECC). More details will be explained in the ECC Manual.




- Boiler Specification
  
ZOZEN STRENGTH
Wuxi ZOZEN Boilers Co., Ltd. has been committed to manufacturing, researching and developing industrial boilers since its foundation in 1988. ZOZEN has obtained PRC Grade A Manufacture License of Special Equipment (Boilers), PRC Grade BRII  Manufacture License of Special Equipment (Pressure Vessels), ASME "S" (Power Boilers) and "U" (Pressure Vessels) stamps and many other international certificates of authorization. Being the leading manufacturer of industrial boilers in Asia, ZOZEN already has the ability of an annual production scale exceeding 2000 sets; the output value of the last two years both exceeded $1.5 billion, ranking the first in the whole industrial boiler industry. With over 30 years of efforts, ZOZEN high-quality boilers are exported to many countries and regions all over the world and all
walks of life including tobacco, rubber, food, paper-making, pharmaceuticals, electronic, heating industry, etc.; they have won the high
recognition and evaluation from numerous well-known enterprises.