Gobar Gas Plant construction by 0l6s6IU

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									Gobar Gas Plant construction


  Class IX
Bio gas for village…
   Bio gas is a clean unpolluted and cheap
    source of energy in rural areas. It consists
    of 55-70% methane which is inflammable.
    Bio gas is produced from cattle dung in a
    bio gas plant commonly known as gobar
    gas plant through a process called
    digestion.
Objectives
   1. To provide fuel for cooking purposes
    and organic manure to rural house holds
    through family type Bio Gas Plants.
    2. To mitigate drudgery of rural women,
    reduce pressure on forests and accentuate
    social benefits.
    3. To improve sanitation in villages by
    linking sanitary toilets with bio gas plants.
Construction Technique – Need to
keep in Mind
 Site Selection
 Digging of the pit
 Foundation laying
 Machinery construction work
 Laying of pipeline and accessories
 Precautions in lying pipelines.
A lay out Model of Gobar gas plant
Components required for Bio gas
plant
   Mixing tank and inlet
   Digester
   Gas holder or gas storage dome
   Outlet and compost pits and
   Gas main outlet and valve, pipeline,
    water fittings, gas stoves, lamp and
    similar appliances run on bio gas.
Feeder (Raw materials) from the
Villages
 Cow dung
 Human waste (link latrine to the Gas plant)
 Animal waste
 livestock and poultry wastes, night soil,
  crop residues, food-processing and paper
  wastes, and materials such as aquatic
  weeds, water hyacinth, filamentous algae,
  and seaweed.
Construction Process…
   First a pit is dug, perhaps ten feet deep.
    Then a water-tight cement cylinder (with
    brick or gravel) is constructed. Next, a wall
    is built across the middle, extending up
    from the bottom, not quite to the top.
    Intake and outgo pipes are installed. The
    whole unit is water-tight.
   The manure is mixed with water in the
    Intake basin to make a slurry, which then
    goes down the pipe to the bottom of the
    left side. This side of the cylinder
    gradually fills and overflows to the right
    side. Meanwhile, the whole mass bubbles
    methane up to the top. It collects under the
    large metal bell-like cover. The gas builds
    pressure, and can be taken off through a
    rubber tube to a gas stove in a kitchen.
Model of Gas plant
   When both sides of the cylinder are full,
    the effluent flows out from the bottom of
    the right side each time more raw manure
    is added to the left. What comes out on the
    right is of more value as fertilizer than the
    raw manure. So the methane is an added
    byproduct literally "something for
    nothing," once the capital expense of the
    construction is paid.
Cost estimate…

        Capacity of   retention
Sl. no.    plant        period    Unit cost

  1       1 cu. m      40 days     4700/-

  2       2 cu. m      40 days     6500/-

  3       3 cu. m      40 days     7600/-

  4       4 cu. m      40 days     8700/-
         Subsidy available to Villages



                                                                                    State subsidy
                                                                                         for Hilly
                                                                                        areas not
                                                                                        approved
                                                                                           from
Size of Plant   Central subsidy for SF,   Central       State subsidy under Anila         central
      (in cu.       MF AL SC ST Hilly       subsidy         Yojane SF MF AL SC ST        governm
        m)                areas            for others             Hilly areas               ent      Total

     1                  2300               1800                  1500                   2000         3800

     2                  2300               1800                  3500                   4000         5800

     3                  2300               1800                  3500                   4000         5800

     4                  2300               1800                  3500                   4000         5800
Advantages
(a) Large cattle population in the countryside
   ensuring steady source of supply of the
   raw material required for running the gas
   plant.
(b) Helps in reducing the deforestation as it
   arrests for cutting of trees for firewood.
(c) Helps in maintaining ecological balance.
(d) Helps in rural sanitation
(e) Lower capital cost and almost cost free
   maintenance.
(f) Removes drudgery of women.
Uses of Gobar Gas…
Generally the uses of the gas can be as under
  1) cooking
2) lighting
3) Motive Power a) run pump set b) chalf-
  cutter
4) can produce electricity.
Motive Power can be produced by linking
  the Gobar Gas to a duel fuel engine,
  specially designed for Gobar Gas.
Courtesy
   http://www.unu.edu/unupress/unupbooks/8
    0434e/80434E0k.htm

								
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