Rotary drum draya  na-akpọ mpịakọta draya, nke a na-ejizi site na-eweta ya kpọmkwem kọntaktị a kpụ ọkụ n'ọnụ gas. Draya mee nke a nnukwu, n'usoro cylindrical tube.

Draya mkpọda ubé ya na-agbapụta n'ahụ ọgwụgwụ bụ ala karịa ihe oriri ọgwụgwụ iji kọwaa na ihe onwunwe site na draya n'okpuru.

Draya nwere ike nkụ ọtụtụ ihe nke nwere mmiri mmiri, dị ka ọka, ose talugwu, mkpụrụ pomace, ọdọ mmiri apịtị, coal, coal slurry, ulo oru mkpofu, na ụrọ nkume. Draya na-ọtụtụ-eji ụlọ ihe, nkà mmụta banyere ígwè, na chemical ụlọ ọrụ. The kasị pụta ìhè uru ndị dị elu akọrọ ike, ezigbo adiana, elu arụpụtaghị na ala oriri ike. 

Site continuable mma, na igwe nwere ike izute mmepụta mkpa nke mba dị iche iche. Anyị na-na natara a otutu otuto si n'ụwa nile nke pụtara na anyị ihicha igwe bụ a na-ewu ewu otu. Anyị ígwè bụ a ọma ụdị mmeghari green fule igwe. Ọ bụ n'ezie a zuru okè Nchikota ihicha na jụrụ. 

Arụ ọrụ ụkpụrụ:
Ihe na-mịrị amị abatakwa draya, na dị ka draya na-agbagharị, ihe onwunwe na-elu site na usoro nke esịtidem ntù lining n'ime mgbidi nke draya.
Mgbe ihe na-akawanye elu iji tụgharịa azụ kwụsịrị ntù, ọ dara azụ ala na-ala nke draya, agafe na-ekpo ọkụ gas iyi ka ọ dara.
Nke a gas iyi nwere ike ma na-agagharị n'ebe orùrù njedebe site na ndepụta ọgwụgwụ (mara dị ka ngalaba-ugbu a eruba), ma ọ bụ n'ebe na ndepụta njedebe site na-agbapụta n'ahụ ọgwụgwụ (mara dị ka counter-ugbu a eruba).
The gas iyi nwere ike mee nke a ngwakọta nke ikuku na combustion, haruru si a burner, nke ikpe draya na-akpọ a kpọmkwem kpụ ọkụ n'ọnụ draya.
Nhọrọ, ndị gas iyi nwere ike iso nke ikuku ma ọ bụ ọzọ (mgbe ụfọdụ inert) gas na-preheated. Mgbe gas iyi na-preheated site ụfọdụ n'aka ebe burner combustion, haruru adịghị tinye draya, draya maara dị ka na-apụtachaghị ìhè-kpụ ọkụ n'ọnụ ụdị.