Automatic control method for steam heat tracing temperature of low-low-temperature electric precipitation ash bucket

The invention discloses an automatic control method for steam heat tracing temperature of a low-low-temperature electric precipitation ash bucket, which comprises the following steps of: controlling the wall temperature of the ash bucket by adopting a variable parameter control means of variable dynamic deviation control gain and static deviation elimination time, screening out the highest temperature T6 from a plurality of temperature measuring points at an outlet of a WGGH when the WGGH is put into operation, and setting a control target value St of the wall temperature of the ash bucket at 80 DEG C; when the wall temperature difference of the multiple ash buckets exceeds 10 DEG C, 5 seconds are delayed to trigger an alarm function to prompt that the pipeline dredging condition needs to be checked, and uneven heating is prevented; and when the actual steam consumption value and the calculated value are greater than the set values, alarming. When the system is put into operation at low temperature and low te