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Rice Hull Furnaces for Paddy Drying: the Philippine Rice
Research Institute's Experience
E.U. Bautista, R.E. Aldas, and E.C. Gagelonia*
RICE
hulls constitute
14-26%
of
the
harvested weight
of
paddy. With the current annual Philippin.e paddy
production
of
around 9 Mt,
some
1.8
Mt
of
rice hulls
are produced each year. Although some
of
the
hul~s
produced by small rice mills are use? as
d~mes.ttc
fuel
or
as a livestock feed (when mIxed with
nee
bran), vast quantities
of
husks are not utilised and are
disposed
of
in vacant areas
or
along roadsides.
The energy content
of
rice hulls ranges from 14 to
16
MJ/kg (6000--6800 BTU/lb); a tonne
of
hulls is thus
equivalent to about
84
gallons
of
heating oil having
140,000 BTU/gal (Beagle 1978). In the Philippines,
the best potential use for rice hulls, aside from domes-
tic fuel, is in paddy drying. Paddy drying is commonly
accomplished by a combination
of
field and
di~ect
solar drying on a pavement
or
open road. MechanIcal
drying
is
employed when the harvesting occurs during
the monsoon season. Most millers using batch dryers
fire them with kerosene furnaces, but are beginning
to
shift to rice-hull-fired furnaces due to cost constraints.
Other sophisticated dryers
of
several private traders!
millers
in
the country are equipped with rice-hull-fired
boilers which generate steam for drying.
This paper discusses the rice-hull furnaces adopted
by the Philippine
Rice
Research Institute (PhilRice)
in its dryer studies, their performance when fitted to
dryers, and the dissemination work conducted to pop-
ularise and commercialise the dryers and furnaces.
Furnace Designs
and
Drying
Performance
There is already available in
the
country a widc range
of
furnace systems designed for the direct combus-
tion
of
rice hulls. PhilRice adopted three furnace
designs
in
its paddy-drying studies and is in the proc-
ess
of
refining one design
for
dissemination
of
dryers
in the country.
* Rice Engineering and Mechanisation Division, Philippine
Rice Research Institute, Maligaya, Muiloz 3119, Nueva
Ecija, Philippines.
253
1.
Grate-type furnaces
The first design utilised in flat-bed dryers is the IRRI
BD-2 flat-grate furnace (Fig. 1) which is an up-draft
type, flat-grate, rice-husk furnace. It consists
of
a hull
feeding component, a combustion chamber, and an ash
precipitation chamber. It is simple in construction and
operation.
The
air for combustion, is
supplie~
by
~h.e
suction
of
the dryer fan, while the fuel supply
IS
faclh-
tated by the vibration
of
a feeder connected by a wire
to the fan shaft. At a feed rate
of
IO
kg/hour, furnace
efficiency
is
68-70%
(IRRI 1979). However, it
~as
incomplete combustion and inefficient ash separatIon
so that ash and sparks are partially sucked
by
the fan
into the dryer plenum (phan Hieu Hien 1993).
Similar to the flat-grate furnace is the inclined
grate furnace design (Fig.
2) from
t~e
University
of
Agriculture and Forestry
(UAF)
, VIetnam and was
based on the IRRI design.
It
has similar performance
to
that
of
the IRRI furnace but has more durable steel
parts than the former. particularly the grate, which is
made
of
mild stecl. At
34
kg/hour rice hull feed rate,
the drying air temperature at the plenum could ranged
from 40 to 54.3°C, with a
484
to 509°C exhaust tem-
perature; with a higher feed rate, drying air tempera-
ture can be pushed up at 80°C. Efficiency ranged
from 48.4 to 86.1 %. Combustion takes
10-20
min-
utes and is characterised by the production
of
much
smoke.
The
hopper needs to be loaded with husks
every
10-15
minutes. Once ignited, combustion is
maintained while there are rice hulls. The ash has to
be
manually raked from the furnace.
Technical evaluation
of
the performance
of
the Viet-
nam-adapted 6 tJbatch MaJigaya flat-bed dryer (with
concrete bin) using the inclined-grate furnace was con-
ducted in Nueva Ecija and Davao del Norte, in order to
establish parameters for its optimum operation. Para-
meters such as grain depth, fan speed, and drying air
temperature werc examined to determine their effects
on drying rate, uniformity
of
moisture content, milling
and head rice recoveries, and germination rates.
Results (Table
1) indicate that the improved dryer per-
formed best at
26
to
34
cm
grain depth,
and
maximum
air temperatures
of
43
and 47°C for seed and milling
Przeglądanie stron 0
1 2 3 4 5 6 ... 40 41

Podsumowanie treści

Strona 1 - , VIetnam and was

Rice Hull Furnaces for Paddy Drying: the Philippine Rice Research Institute's Experience E.U. Bautista, R.E. Aldas, and E.C. Gagelonia* RICE hull

Strona 2 - <l <l

Commercialisation of a Mobile Flash Dryer for Farmer Cooperatives Manolito C. Bulaong, Renita Srn. Dela Cruz, and Silvestre C. Andales* DRYING of wet

Strona 3 - 60 60 56

Figure 1. Schematic diagram of the Mobile Flash Dryer showing the principal components. (I) kerosene burner; (I a) rice-hull furnace; (2) engine;

Strona 4 - Exhaust

Table 1. Design features and specifications of the mobile flash dryer. Type Continuous flow or recireulating batch Height 2.5 m (without elevator)

Strona 5 - 3. Zeta furnace

1995, ca 25 Philippine pesos (pHP) = US$I), including a 5 h.p. gasoline engine. Table 2 gives a cost and return analysis for the MFD considering two

Strona 6 - PhilRice

Table 3. Comparison of costs of various drying options during wet season harvest. Drying option Final Selling cost m.c." % pesos/kg ($/kg) I.

Strona 7 - J. Training operators

References Bulaong, M.C., Paz, RR, Anchiboy, T.P., and Rodriguez, A.C. 1992. Development and pilot testing of the NAPHlRE mobile flash dryer.

Strona 8 - Local adoption

Grain Condition Monitoring and Aeration Control Systems Cao Guanzbi* THE Grain Condition Detection, Analysis, and Venti-lation Control System (GCDA

Strona 9 - Thanh and Le Doan Dien*

moisture content and the purpose of the aeration (lowering temperature, reducing moisture contact, or adjusting) are put into the computer. In th

Strona 10 - Commercialisation

Summary Advanced mathematical models are used to manage grain conditions and provide dynamic real time con-trol of aeration. This automatic control re

Strona 11 - (10) pneumatic tyre

Use of Rice Husk Gasification in Grain Drying Chen Zhishun* JIANGSU is one of the important agricultural provinces of China producing on average 32 Mt

Strona 12 - + in-store drying). Using

purposes, respectively. Fan speed had no significant effect on headrice yield and gennination. Other problems fornlerly associated with earli

Strona 13 - = US$I), including

Tablet. Test data of the three main types of dryer Types Capacity (t1h) Moisture removal (%) Fuel Fuel consumption (kg/h) Energy consumption in water

Strona 14

wet grain ~rice husk /' gas producer / gas store drum cyclone heat exchanger I elevator conditioning tower \ / dryer burner I fan Figure 2. In

Strona 15 - References

(b) Since the gas in the up-draft type is of more combustible CO and CH4 (but less H2) than the gas in the down-draft type, the up-draft

Strona 16 - Aeration Control Systems

The Effects of Drying and Shelling on Fusarium spp. Infection and Fusarium Toxins Production in Maize O.S. Dharmaputra*, H.K. Purwadariat, H. Susilo§,

Strona 17 - Practical Application

An initial sample was obtained from each replicate Gar) at the beginning of storage, and further samples at I, 2, and 3 months of storage. Each

Strona 18 - Bibliography

Table 2. Moisture content of maize treated with different methods of drying during storage. Drying method" n 1II IV Moisture content (%) Duratio

Strona 19 - Chen Zhishun*

The etTect of maize variety, methods of drying and shelling, and storage duration on population of Fusarium spp. Two species of Fusarium were isolate

Strona 20 -

NIV and DON contents of maize var. CPJ-2 (1.86 and 0.28 ppm) were higher than those of var. Arjuna (1.80 and 0.25 ppm) (Table 9). NIV contents of

Strona 21 - 132 kg/

Table 8. Cont'd. b. Deoxynivalenol Source of df ss MS F Value variance A B AxB C AxC 0.03455163 3 0.10848777 3 0.03191734 0.01254132 0.04832163

Strona 22 - Conclusion

Food Affairs; and Mr Sunjaya and Mrs I. Retnowati, scientists of Tropical Pest Biology Programme, SEAMEO BIOTROP, for their valuable assistance, R

Strona 23 - Fusarium spp

Table 1. Results of drying tests at different grain depth. fan speed and drying air temperature for the Maligaya 6-ton flat-bed dryer-cum-inclined gra

Strona 24 - Results and Discussion

Drying Simulation: a PC-based, User-orientated Decision Support System for In-store Drying and Aeration of Grains V.K. Jindal, R.e. Martinez, and Le V

Strona 25 - 0 I 2

• Simulation results can be saved on a file and imported into other software packages for further analysis. Drying Simulation does not o

Strona 26

The Current Situation and Prospects for Grain Drying in Northeastern China Ju JinFeng, Liu Fangjiu, Du ShuXiao, and Xu ZengTao* THE Songliao Plain of

Strona 27 - Conclusions

day are kept by state granaries, grain processing fac-tories, state fanns, and feed-processing plants, total-ling about 858 units. Most small,

Strona 28 - Fusarium spp. population

Table 4. Amount of grain dried by different methods in three provinces of North East China (x 1000t). Province Total Maize Rice Soybean Wheat Oth

Strona 29

Because gas, oil, and electricity are prohibited for heat generation in China, the heat supply for most early stage grain drying is from anthra

Strona 30 - Aeration

The dryer was operated at temperatures of 15-30°C and relative humidities of 30-50%. Table 9 gives the drying time per barn, and Table 10 throughput

Strona 31 - Availability

Table 8. 1be least input air ratio of various wet grains in aeration drying. Moisture content of wet 16-20 20-24 Above 24 Least input air ratio (m3 a

Strona 32 - Northeastern China

...L-I--+-+-l-+-+-J Figure 1. Crossflow grain drying machine. 290

Strona 33

1 i • Entry channel for hot air .!. Evacuation channels for spent air HOT AIR CAISSON Figure 2. Mixed flow grain drying machine. Figure 3. Counter-cur

Strona 34 - 000t) units

· . . '., . A'7"~"","=-"~"",,,,==,.-==~-t.:\;:~X~·;:~:~·;·: Hopper To blower Inclined grate Frame Figure

Strona 35

Figure S. Mixed flow grain drying machine. Figure 8. A new type of coal-fired hot-air stove. Figure 6. Cylindrical crossflow grain drying machine. I

Strona 36 - /h.t. Above 15°C and

Figure 9. Radial type mechanical ventilation drying granary. 4-n-lI!JA (0) (b) Figure 10. Plan view of ventilation ducting for (a) arch grain hous

Strona 37 - Northeastern Provinces

bin, at an airflow rate of 0.8 m3tsec and static pres-sure of 20 to 26 mm water. An average moisture reduction of 1.3 to 1.5%/hour, equivale

Strona 38 - ...L-I--+-+-l-+-+-J

Table 2. Summary of drying data for 5-ton in-bin dryer and storage system using Zeta fumaee. Test no. Date and time begun Date and time ended Duration

Strona 39 - Entry channel for hot air

ers may already have (Le. pig pens that could be converted during periods when drying is needed). The use of existing prime movers, nor

Strona 40 - I':~

Local adoption The dryer is being promoted to adopters who finance the whole dryer but with technical assistance from PhilRice. The adoption o

Strona 41 - 4-n-lI!JA

Drying Maize and Maize Seed in Vietnam Bui Huy Thanh and Le Doan Dien* IN recent years, maize production in Vietnam has expanded, especially hybrid ma

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