What is the difference between 折磨 and 煎熬?
折 - break


磨 - grind


折磨 - torture; torment; suffering

~

煎 - fry in oil or cook in water


熬 - slow cook with water


煎熬 - torture; torment; suffering

Both 折磨 and 煎熬 means 'torture'
折磨 emphasize the application of torture (apply force to cause pain). That's why we use 折磨 instead of 煎熬 for the verb 'to torture' e.g. 折磨他一晚 (torture him a whole night) not 煎熬他一晚
煎熬 emphasize the effect of torture (feel the pain of being boiled). 內心煎熬 (suffer inside) actually mean 內心受煎熬 (feel tortured inside)
Similarly, 內心折磨 (suffer inside) actually mean 內心受折磨 (feel tortured inside)

她折磨我✔ 她煎熬我✘ 我的内心很折磨✘ 我的内心很煎熬✔


她折磨我✔ - the verb 折磨 (to torture) is correctly placed between the subject and object

她煎熬我✘ - 煎熬 is not used as a verb for to 'torture'

我的内心很折磨✘  - 我的内心很受折磨✔ - 折磨 is an action while 受折磨 can be a feeling

我的内心很煎熬✔ - In this context, 煎熬 strongly imply 受煎熬 (a feeling)



我被受中文折磨✅


我被受中文煎熬✅

我備受中文煎熬 is correct because it is [備受(v)]~[煎熬(n)]
中文折磨我✔ (grammatically correct, but the subject 中文 and the verb don't quite match. How does 中文 折磨 someone?)
中文煎熬我✘

'被受' should be '備受' (receive)