The development cent boiler of boiler and furnace two respects.
On 18 centuries half leaf, the steamer that British colliery uses, the earlier steamer that includes watt inside, uses vapour pressure is equal to atmosphere force. Leaf of 18 centuries second half converts the vapour of pressure of prep above air. 19 centuries, commonly used vapour pressure increases 0.8 million handkerchief to control. Suit with this photograph, the earliest steam boiler is the shell of vertical of form of big diameter cylinder of a Cheng Shui, convert later horizontal shell, make a fire in body of heater of build by laying bricks or stones of brick of shell lower part.
Do bigger more as boiler, to raise be heated area, the canister that hold fire is added in shell, make a fire in igneous canister front, flue gas comes out from the back of igneous canister, the flue platoon that adopts bricky step is opposite to chimney of shell exterior heat, call igneous canister boiler. Begin to install canister of a fire only, call boiler of only anger canister or Kang Ni to make boiler, add two fire canister later, call boiler of double fire canister or Lan Kaixia boiler.
Controlled 1830, be produced in what mastered high grade steel tube and bilge fire appeared to be in charge of boiler after providing a technology. Piping outfitting of a few fire is in shell, form the main heating surface of boiler, fire (flue gas) had flowed inside the canal. In shell put waterline to go up with remove theatrical makeup and costume as far as possible much igneous pipe, temper is lighted to be in charge of boiler outside calling horizontal. Its metallic cost amount is inferior, but the put oneself in another's position of build by laying bricks or stones with very large need.
19 centuries middle period, appeared conduit boiler. Boiler heating surface is the conduit outside shell, replaced tube of the igneous canister inside shell itself and shell, fire. Of the be heated area of boiler and force of evaporate steam pressure increase to get no longer the limitation of shell diameter, be helpful for increasing boiler capacity and vapour pressure. The cylinder form shell in this kind of boiler is satisfied incognito for drum, or call drum. Earlier conduit boiler uses straight conduit only, the pressure of straight conduit boiler and capacity are restricted.
20 centuries are earlier, turbine begins to develop, it asks to deserve to be mixed with the capacity the boiler with vapour taller parameter. Straight conduit boiler already cannot satisfy a requirement. As the development of workmanship and water treatment technology, appeared to bend conduit type boiler. Beginning is to use much drum formula. As the application of water-cooling wall, superheater and economizer, and drum interior steam, water divides those who leave component to improve, drum amount drop off, already managing metal, be helpful for improving the pressure of boiler, temperature, capacity and efficiency again.
The igneous canister boiler previously, igneous pipe boiler and conduit boiler belong to natural circulation boiler, lunt is rising, drop differ because of be heated circumstance in pipeline, cause density to differ and generate natural flow. Developing natural circulation boiler while, begin to use dc boiler from 30 time, 40 time begin to use auxiliary circulation boiler.
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