Khenpo Kartse will not be freed, officials say.
Paramilitary police patrol town in which Chinese forces fired on protesters two years ago.
He had shared the banned content on his mobile phone with others.
The blaze follows other recent major fires in Sichuan's Kardze prefecture.
The crackdown further tightens controls by the Chinese authorities in the restive Tibetan prefecture.
Prison officials block visits by his lawyer and family.
They are taken away two months after a local self-immolation protest.
They disperse after an assurance that monks could visit some of those held in Qinghai's Nangchen county.
Local Tibetans have a history of resistance to outside control.
All three had voiced concerns for Tibet's environment.
More than 2,500 people are left without shelter by the blaze.
Authorities have launched an investigation into the source of the inferno.
More than 1,000 Chinese paramilitary forces take part in an operation to crush opposition to the project.
They receive sentences of up to two years in prison.
Chinese authorities further tighten controls in a protest-hit Tibetan county.
Those held are linked to a campaign aimed at boosting Tibetan unity and literacy.
In a letter sent from jail, he urges supporters to avoid clashes with the police.