Ruwan sarrafawa na 'ya'yan itace na kwalliya mai aiki - nau'in mai aiki na kwalliya mai aiki na kwalliya mai aiki: (1) Slap furnace: wanda aka sani da Saddle-type furnace, saboda tubali mai jurewar wuta na belt na aiki shine Saddle-type, asali shine takardar shaida ta Faransa, ƙarshen Soviet Union ta gabatar da shi a ƙasarmu a cikin 1950s. Bayan jerin ingantawa, ya zama babban nau'in tandu don samar da charcoal mai aiki a halin yanzu.

Activated gas: tururi na ruwa.

Babban amfani: ci gaba da samarwa, babban samarwa, ingancin inganci, babban zafin jiki na tururi mai zafi, kwanciyar hankali, babu buƙatar dumama na waje.

Babban matsala: high bukatun albarkatun kasa, high farashi, high fasaha bukatun, babban kudin gyara.

(2) Mai ƙonewa:

Gas mai aiki: Gas mai zafi da aka samar ta hanyar ƙona kwal.

Babban amfani: Simple zuba jari lardin.

Babban matsala: yawan man fetur, aiki mara daidaito, aiki mai ƙarfi, ƙura mai girma.

(3) Mai ƙasa:

Active Gas: Ruwa tururi (Air)

Babban amfani: mafi sauki murhu iri.

Babban matsaloli: low yawan, low inganci, asali bita iri, gurbataccen muhalli.

(4) Multi bututun murhu:

Activated Gas: Ruwa tururi

Babban amfani: Babu buƙatar man fetur, kwanciyar hankali, sauki sarrafawa, babban samarwa.

Babban matsala: aiki ba daidai ba, ingancin carbon ba shi da kyau, ƙananan zafin jiki na tururi mai zafi, bututun wuta mai jurewa yana da sauƙin lalacewa, babban zuba jari.

(5) juyawa murhu:

Activation gas: hayaki gas, ruwa tururi

Babban amfani: ci gaba da aiki, aiki mafi daidai, dace da samar da gas phase aiki carbon.

Babban matsalolin: kayan aiki masu girma, rashin ingancin zafi, amfani da man fetur, ƙananan ingancin samfuran da aka gama.

(6) Mai tafiya

Active gas: iska, ruwa tururi.

Babban amfani: Gas karfafa lamba mai kyau, daidai kunnawa, inji ya dauki ƙananan yanki.

Babban matsala: tsakanin lokaci samarwa, sauki sludge tasiri al'ada aiki, man fetur.