9T/H Automatic Brown Coal Fired Steam Boiler Travelling
Reciprocating Step Grate
Residence time in furnace
The residence time of garbage incineration has two concepts:
1. It refers to the residence time of garbage in the grate from the
time it enters the furnace to the time it is discharged from the
furnace. According to the current situation of garbage composition,
calorific value and moisture content, the residence time of garbage
in the furnace is generally 1 ~ 1.5h.
2. Refers to the time it takes for the toxic and harmful smoke
generated by garbage incineration to be further oxidized and burned
in the incineration condition in the furnace, so as to turn the
harmful substances into harmless substances.
The residence time is an important basis to determine the size of
furnace body.
Generally speaking, in area above 850 ℃ temperature for 2 s, can
meet the needs of the waste incineration technology.
The advantage of a grate furnace is that it does not require
pretreatment of waste.
The technology is mature and widely used in foreign countries. Its
disadvantages are as follows:
1. Furnace row must be heat-resistant, during long-term continuous
operation, the thermal stress must remain unchanged, so that the
furnace row material requirements, and the processing of the
furnace row is complex, because the furnace row needs to rotate,
low reliability and high energy consumption constitute its
problems.
2. Because of the complex composition of garbage, it is difficult
to keep the common grate moving uniformly in the whole grate and to
burn uniformly and completely.
3. It is difficult for the grate to adapt to refuse incineration
with a wide range of moisture content, because the waste with high
moisture content needs a wide dry area, which makes it difficult
for the waste with high water content to be completely burned.
4. More difficult to control furnace temperature, waste slag at
above 1000 ℃, and 1050-1100 ℃ in the softening and viscous state,
become the special corrosive substance, may be corrosion of furnace
wall, at the same time under high temperature condition Nox
concentration increased.
5. It is difficult to realize large-scale furnace and remove HCI
gas in the furnace. Special equipment and HCI removal equipment
need to be installed in the tail, which increases the investment
cost.
6. It is necessary to set up special sewage treatment facilities
for refractory landfill leachate.
7.The grate furnace is not only complex to manufacture, high cost,
but also large in size and covers a large area.
Data sheet of reciprocating grate stoker
Main technical Parameters of
Reciprocating (Stepping) Grate Combustion Device |
|
Boiler Capacity
(t/h) | Active grate
area (m2) | Active Width (mm) | Reciprocate Length
(mm) | Angle Grate
(deg) |
| 4t/h | 6 | 997 | 6000 | Optional |
| 6t/h | 7.5 | 997 | 6500 | Optional |
| 8t/h | 8.9 | 997 | 6500 | Optional |
| 10t/h | 10.5 | 1197 | 7500 | Optional |
| 15t/h | 14.6 | 997 | 7000 | Optional |
| 20t/h | 20.7 | 997 | 7500 | Optional |
| 25t/h | 24.6 | 997 | 7500 | Optional |
| 30t/h | 28.6 | 997 | 8000 | Optional |
| 40t/h | 34.5 | 997 | 7900 | Optional |
| 60t/h | 48.7 | 997 | 6500 | Optional |
| 100t/h | 90.7 | 997 | 8500 | Optional |
Applications
Furnace coal fired chain grate stoker can be applied in chemical
plant, university, food factory, beverage factory, cannery, textile
mills, paper mill, sugar plant, central heating and other
industries.
