How can apply for china visa while I am not in my country and I have a 3-month schengen visa?

I am a researcher from Iranand spending my research stay in Hamburg for 3 months. I have been invited to participate in the 2014 ProSPER.Net Young Researcher’s school, to be held at Tongji University, Shanghai, people’s Republic of China from 15 to 26 September2014.
Once, I have applied for visa to Chinese embassy in Hamburg, I have been informed that I can not apply due to the my short time visa validation( 3 months).
According to the relevant staff’s advise, I should apply for visa from Iran. As far as, I have to stay in Germany until 14 September and my program in China will be started from 15 September, hence, it is not possible to apply for visa from Chinese embassy in Iran.

I have contacted with consoler of Iran in Hamburg and they also informed me that they cannot do anything because they have just authority to issues visa for foreigners who would like to apply visa to Iran.

I would be appreciate if you help me what shall I do in this situation?