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Steam boiler

Also called: rice mill boiler, husk fired boiler, steam boiler machine, rice husk boiler

Step 3 of 8: Parboiling

A fired pressure vessel that makes the steam for parboiling, and often the heat for the dryer as well.

Availability subject to feasibility check

Prices depend on the specification and the supplier. Request a quote.

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Example of a Steam boiler
Example of this machine type, not a specific model we supply.Photo: Jbl87, CC BY-SA 4.0, commons.wikimedia.org, edited

Steam boiler: how it works

  1. Rice husk from the mill's own huskers is fed into the furnace and burned.
  2. The hot gases pass through or around tubes and heat the water in the boiler shell.
  3. The water boils into steam, which collects under pressure at the top.
  4. Pipes carry the steam to the soaking tanks, the steamer and the dryer's heat exchanger; safety valves and gauges guard the pressure and the water level.

Main types

Fire-tube boiler
Hot gases run inside tubes that pass through the water. Compact and common in rice mills.
Water-tube boiler
Water runs inside the tubes and the fire is around them. For larger steam demand and higher pressure.
Husk-fired furnace types
Husk can burn on a fixed grate, a moving grate or in a fluidised bed; the choice affects labour, ash and smoke.

Where it fits in the process

It is the heat source of the parboiling section: it burns the husk that husking leaves over and sends steam to soaking, steaming and drying.

The same machine in another industry: Power & utilities

Steam boiler price in Bangladesh: how to get a quote

We do not publish prices. The price of a machine depends on its specification, the supplier and the shipping terms, and it changes with the market. Tell us the points below: we check feasibility and the import rules, then send you a quotation.

What to tell us

  • How much paddy you parboil and dry in a day.
  • The fuel: rice husk only, or also wood, gas or other fuel.
  • The steam pressure your steamer and dryer need, if you know it.
  • Your water source and whether you treat the feed water.
  • New or reconditioned.
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Common questions

Why do rice mills burn husk in the boiler?

Husk is about a fifth of the paddy by weight and comes free from the mill's own huskers. Burning it gives the steam for parboiling and drying, so the mill buys little or no other fuel.

Does a boiler need a licence in Bangladesh?

Steam boilers are regulated. The rules, the registration and the inspections are the business of the government's boiler inspectorate, so confirm the current requirements with that office before you buy. We check the import rules before we quote.

What is the price of a rice mill boiler in Bangladesh?

We do not publish prices. The price depends on how much steam you need, the pressure, the type of boiler and furnace and whether it is new or reconditioned. Send us the points listed above and we will quote.

More machines in this step: Parboiling

  • Soaking tanks

    Large tanks where clean paddy is soaked in water, often warm water, until the grain has taken up enough to be steamed.

    Availability subject to feasibility check

    Request this machine

  • Steamer

    A vessel that passes steam through the soaked paddy. The starch sets, so the grain turns harder and breaks less when it is milled.

    Availability subject to feasibility check

    Request this machine