Mkpọ ọkụ nke coal na ụlọ ọrụ na-emepụta ike na-emepụta ihe mkpofu siri ike, dị ka ala na uyi ofufe, na flue gas na-esi na mbara igwe. A na-achọrọ ọtụtụ osisi iji wepụ ikuku SOx sitere na gas flue site na iji sistemu gas desulfurization (FGD). Teknụzụ FGD atọ ndị a na-eji na US bụ ịsa mmiri mmiri (85% nke nrụnye), nchacha akọrọ (12%), na injection sorbent (3%). Ndị na-ehicha mmiri mmiri na-ewepụ ihe karịrị 90% nke SOx, ma e jiri ya tụnyere ndị na-ehicha nkụ, nke na-ewepụ 80%. Akụkọ a na-egosi teknụzụ ọgbara ọhụrụ maka ịgwọ mmiri mkpofu nke mmiri mmiri na-emepụtaSistemụ FGD.
Ihe ndabere FGD Wet
Teknụzụ FGD Wet nwere ọnụ ngalaba reactor na mpaghara mmiri siri ike. A na-eji ụdị ihe dị iche iche eme ihe, gụnyere ụlọ elu juru na tray, venturi scrubbers, na ihe nchacha na mpaghara reactor. Ndị na-etinye ihe na-ekpo ọkụ na-ekpochapụ gas acid na-eji alkal slurry nke lime, sodium hydroxide, ma ọ bụ nkume nzu. Maka ọtụtụ ihe kpatara akụ na ụba, ndị na-ehicha ihe ọhụrụ na-ejikarị nkume limestone slurry.
Mgbe nkume limestone na-emeghachi omume na SOx na mbenata ọnọdụ nke onye na-etinye ihe, SO 2 (isi ihe dị na SOx) na-agbanwe ghọọ sulfite, na-emepụta slurry ọgaranya calcium sulfite. Sistemu FGD gara aga (nke a na-akpọ ya dị ka oxidation eke ma ọ bụ sistemu oxidation na-egbochi) mepụtara ngwaahịa calcium sulfite. ỌhụrụSistemụ FGDwere reactor oxidation nke calcium sulfite slurry na-atụgharị gaa na calcium sulfate (gypsum); A na-akpọ ihe ndị a dị ka sistemu FGD (LSFO).
Sistemu LSFO FGD nke ọgbara ọhụrụ na-eji ma ọ bụ ihe na-agbapụta ụlọ elu nwere ihe nrụpụta oxidation integral na ntọala (ọgụgụ 1) ma ọ bụ sistemu jet bubbler. Na nke ọ bụla gas na-etinye obi gị dum na nkume limestone slurry n'okpuru ọnọdụ anoxic; slurry ahụ na-agafe na mpaghara aerobic reactor ma ọ bụ mpaghara mmeghachi omume, ebe a na-atụgharị sulfite ka ọ bụrụ sulfate, gypsum na-ebulikwa elu. Oge njide hydraulic n'ime reactor oxidation bụ ihe dịka nkeji iri abụọ.
1. Ịgba kọlụm limestone amanye oxidation (LSFO) FGD usoro. N'ime sluber scrubber LSFO na-agafe na reactor, ebe a na-agbakwunye ikuku iji manye oxidation nke sulfite na sulfate. Nke a oxidation na-egosi na ọ na-agbanwe selenite ka ọ bụrụ selenate, na-ebute nsogbu ọgwụgwọ emechaa. Isi mmalite: CH2M Hill
Sistemu ndị a na-arụkarị ọrụ na ihe siri ike kwụsịtụrụ nke 14% ruo 18%. Ihe siri ike kwụsịtụrụ nwere ihe siri ike gypsum mara mma na nke na-adịghị mma, ntụ ofufe, na ihe na-adịghị ahụkebe ewepụtara na nkume nzu. Mgbe ihe siri ike ruru oke elu, a na-ehichapụ slurry. Ọtụtụ sistemụ LSFO FGD na-eji ikewa nkewa siri ike na sistemu mmiri iji kewapụ gypsum na ihe ndị ọzọ siri ike na mmiri nchacha (Njirimara 2).
2. FGD na-ekpochapụ gypsum dewatering system. N'ime usoro gypsum na-ekpochapụ mmiri na-ekpo ọkụ na-ekewa, ma ọ bụ kewapụrụ, n'ime obere iberibe ma dị mma. A na-ekewapụta ihe ndị dị mma na njupụta site na hydroclone iji mepụta mmiri na-asọpụta nke na-agụnye ọtụtụ kristal gypsum buru ibu (maka ire ere) nke nwere ike ịmịnye ya na mmiri dị ala nke nwere eriri eriri na-ekpochapụ mmiri. Isi mmalite: CH2M Hill
Ụfọdụ sistemu FGD na-eji ihe ndọda ike ndọda ma ọ bụ ebe a na-edozi ọdọ mmiri maka nhazi nke ihe siri ike na ịkwanye mmiri, ụfọdụ na-ejikwa centrifuges ma ọ bụ sistemu vacuum drum dewatering, mana ọtụtụ sistemụ ọhụrụ na-eji hydroclones na eriri oghere. Ụfọdụ nwere ike iji hydroclones abụọ n'usoro iji mee ka mwepụ nke siri ike dị na sistemụ mmiri mmiri. Enwere ike iweghachite akụkụ nke oke mmiri hydroclone na sistemu FGD iji belata erute mmiri mkpofu.
Enwere ike ibido nchacha mgbe enwere njupụta nke chlorides n'ime slurry FGD, nke na-esite na oke nguzogide corrosion nke ihe owuwu nke sistemu FGD chọrọ.
Njirimara FGD Waterwater
Ọtụtụ mgbanwe na-emetụta nhazi mmiri mkpofu FGD, dị ka coal na nkume limestone, ụdị nchacha, na usoro gypsum-dewatering eji. Coal na-enye ikuku acidic - dị ka chlorides, fluorides, na sulfate - yana ọla ndị na-agbanwe agbanwe, gụnyere arsenic, mercury, selenium, boron, cadmium, na zinc. Nkume nzu na-atụnye ígwè na aluminom (site na mineral ụrọ) na mmiri mkpofu FGD. A na-egweri nkume nzu n'ebe a na-egwupụta bọọlụ dị mmiri, na mbuze na nrụrụ nke bọọlụ ndị ahụ na-atụnyekwa ígwè na slurry nkume limestone. Ụrọ na-atụnyekarị ụtụ na-adịghị arụ ọrụ, nke bụ otu n'ime ihe kpatara a na-ekpocha mmiri na-ekpofu mmiri na nchacha.
Site na: Thomas E. Higgins, PhD, PE; A. Thomas Sandy, PE; na Silas W. Nyere, PE.
Email:[email na-echebe]
Oge nzipu: Ọgọst-04-2018