Mmanụ a na-ewepụta na coal

coal methane extraction (CBM extraction) bụ usoro maka iwepụta methane site na ebe a na-etinye coal. Coal bed methane (CBM) bụ otu n'ime ihe ndị na-egbochi mmepụta coal n'okpuru ala. Ọ bụkwa ụdị ike dị elu nke enwere ike iji n'ọtụtụ ngalaba dịka mmepụta ike, okpomọkụ, na ụlọ ọrụ kemịkal. 'ihi ya, a na-ewepụta CBM tupu ewepụta ya na ebumnuche nke ịbawanye nchekwa nke ebe a na-egwupụta coal, yana dị ka ihe enyemaka ike bara uru a ga-eji mee ihe.

## Ụkpụrụ ndị bụ isi
Methane adsorbed n'ime matrix coal siri ike (macerals coal) ga-ahapụ ma ọ bụrụ na a na-eme ka ọkpụkpụ coal dị ala. Enwere ike iwepụta methane site na igwu olulu mmiri n'ime coal. Ebumnuche bụ iji belata nrụgide mmiri site na ịdọrọ mmiri site na olulu mmiri. Mbelata nke nrụgide na-enye ohere ka methane si na coal pụọ ma na-aga dị ka gas n'elu olulu mmiri ruo n'elu. A na-agbakọta methane ma tinye ya n'ahịa.

Ebumnuche bụ izere itinye methane n'ime mmiri, mana kwe ka ọ na-aga n'azụ olulu ahụ (n'ime) gaa na ụlọ ọrụ compressor. Ọ bụrụ na a na-agbanye mmiri n'ala nke ukwuu n'oge mmiri na-agbada, methane nwere ike ịga n'elu tubing n'ime mmiri na-eme ka olulu mmiri ahụ bụrụ "gas". Ọ bụ ezie na enwere ike iweghachite methane na mmiri-gas nkewa n'elu, mmiri na gas na-agbapụta adịghị arụ ọrụ nke ọma ma nwee ike ịkpata mmebi na mmebi.

## Mpaghara ndị a na-ewepụta CBM
E gwuru ọtụtụ iri puku olulu mmiri methane, ma tinye nnukwu ụlọ ọrụ nkwado dị ka okporo ụzọ, paịpụ, na compressors maka iwepụta CBM na Powder River Basin nke ugwu ọwụwa anyanwụ Wyoming na ndịda ọwụwa Anyanwụ Montana na ugbu a na India na West Bengal- Ranigunj, Panagarh wdg. Pasent asaa nke gas okike (methane) emepụtara ugbu a na United States sitere na iwepụta CBm. Enwere ike iweghachite methane site na ebe nchekwa coalbed n'ụzọ akụ na ụba, mana iwepụ mmiri bụ nchegbu gburugburu ebe obibi.

E nwekwara saịtị na Central Scotland na Letham Moss.   &#x5B;**'&#x5D;</sup>

A na-echekwa ọtụtụ gas dị na coal n'ime ihe ndị dị n'ime. N'ihi nnukwu mpaghara dị n'ime ya, coal na-echekwa gas 6 ruo 7 ugboro karịa oke nkume nke ebe nchekwa gas. Gas dị n'ozuzu ya na-abawanye na ọkwa coal, na omimi nke ili nke ala coal, yana nrụgide tankị. Ọkpụkpụ, ma ọ bụ eriri, n'ime akwa coal na-ejikarị mmiri jupụta. Ebe ndị dị omimi nwere obere mmiri, mana mmiri ahụ nwere nnu karịa. Iwepụ mmiri site na ala coal na-ebelata nrụgide ma wepụta methane. A na-emepụta nnukwu mmiri, mgbe ụfọdụ saline saline, site na olulu methane coalbed. A na-emepụta mmiri kachasị ukwuu n'oge mmalite nke mmepụta. Nchịkọta nke saline na gburugburu ebe obibi bụ isi ihe na-efu maka mmepụta methane. Enwere ike ịpụ mmiri dị ọcha n'elu, mana a na-agbanye nnu n'ime nkume na omimi ebe nnu nke nnu a na-etinye na ya dị ala karịa mmiri nke nkume ahụ. Mmiri -esi ísì ụtọ maka iweghachite ihe ndị siri ike nwere ike ịpụta na mpaghara ndị nwere ọnụego mmiri dị elu.

== Ịtụle ihe gas dị na coal ==
A na-ejikarị ọnụọgụ gas dị n'elu ala coal eme ihe na nchekwa nke ebe a na-egwupụta ihe yana nyocha na ngwa mgbake nke ebe a. Usoro mkpebi nke ọdịnaya gas na-adaba n'ụdị abụọ: (1) ụzọ kpọmkwem nke na-atụle n'ezie oke nke methane wepụtara site na sample coal mechiri n'ime canister desorption na (2) ụzọ na-apụtaghị ìhè dabere na njikọ nke ahụmahụ, ma ọ bụ nyocha nke isotherm methane nchekwa data. Laboratory sorption isotherms na-enye ozi gbasara ikike nchekwa nke coal sample ma ọ bụrụ na a na-atụle ha n'okpuru nrụgide na ọnọdụ okpomọkụ.  mere, enwere ike ịtụle gas kachasị nke enwere ike ịtụ anya maka mgbake methane site na nyocha isotherm dị otú ahụ.

Ngụkọta gas dị n'ime site na ụzọ ndị na-apụtaghị ìhè dabere na usoro nyocha nke Meinser na Kim nyere. A na-ekpebi ọnụọgụ gas site na usoro Meisner na Kim site na iji mmiri dị n'ime, ihe na-agbanwe agbanwe, oke nke methane adsorbed na coal mmiri, carbon kwụ ọtọ, ọkpụrụkpụ nke coal na okpomọkụ.Meinser (1984) chọpụtara na ọnụọgụ nke gas methane (VCH4) nwere njikọ na ihe na-agbanwe agbanwe (daf).


**Nkọwapụta nke methane dị na coal site na Karol curve'''

Na enweghị methane a tụrụ n'ime ala coal, na data mmepụta site na olulu methane coal, enwere ike ịtụle ọdịnaya gas site na iji usoro Eddy. Eddy na ndị ọzọ wuru usoro nke usoro na-eme atụmatụ nke methane kachasị emepụta nke ala coal dị ka ọrụ nke omimi na ọkwa.A na-ekpebi atụmatụ nke methane dị n'ime ala coal site na usoro Eddy site na ịchọta nkezi omimi nke ọ bụla coal na axis omimi. A na-agbatị akara nkịtị site na axis miri emi (ụkwụ) iji gafee usoro ọkwa coal. A na-agbatị akara site na ebe dị na curve ahụ ruo na axis gas furu efu na nke a na-agbagọ agbagọ (cm3/gm). Njikọ nke akara na axis bụ atụmatụ methane nke coal.

## Nkọwa nke nyocha Ash
klas="cx-link" data-linkid="75" href="./Ash_(analytical_chemistry)" id="mwTw" rel="mw:WikiLink" title="Ash (analytical chemistry)">Ash bụ ihe dị mkpa na-egosi ntinye clastic, nke sitere na mmiri ma ọ bụ mmiri nke ụrọ, silt, na ájá n'oge mmepe peat. Ihe dị n'ime ntụ na-egosi na ọ dị obere karịa ihe dị n'okpuru ala. Ihe dị ala nke ntụ nke ihe nlele nwere ike ịbụ n'ihi na coal deposits na-agbadata ma na-aga n'ihu site na mmetụta mmiri karịa ihe nlele na-agbanye.

## Ihe odide

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