China's central bank is too preoccupied with supporting the economy to contemplate widening the yuan's trading band this year, a Bloomberg survey shows.

Of 22 analysts polled in the past week, 14 forecast there will be no changes made in 2015 to the range in which the currency can move. Four predicted a move in the first half of the year, three said they expected a revision in the third quarter and one chose the October-December period.

The People's Bank of China allows the yuan to diverge a maximum 2 percent from its daily reference rate, and 15 respondents said the limit will probably expand to 3 percent in the next adjustment.