Special active carbon injection control system for purifying flue gas from refuse incineration

Abstract

The invention provides a special active carbon injection control system for purifying flue gas from refuse incineration. According to the special active carbon injection control system, on the premise that the purifying effect of the flue gas is ensured, the injection amount of active carbon is increased and changes along with the flue gas flow, the metering precision of the injection amount of the active carbon is improved, further the purifying efficiency of the flue gas is increased and the use cost is saved. The special active carbon injection control system comprises a distributing auger and devices required to be subjected to flue gas purification. The special active carbon injection control system is characterized by further comprising a PLC (Programmable Logic Controller) system, wherein a weighing screw, a frequency converter, a controller, a flue gas flow detection device, an injection pressure detection device and an active carbon spray nozzle are arranged inside each device required to be subjected to flue gas purification; each weighing screw specially comprises a feeding bin, a screw feeder and a weighing sensor; each screw feeder is communicated to the corresponding active carbon spray nozzle; the PLC system is respectively connected with the output ends of each flue gas flow detection device and each injection pressure detection device; and the PLC system is respectively in two-way connection with each controller.

Description

technical field [0001] The invention relates to the technical field of waste incineration flue gas purification systems, in particular to an activated carbon injection control system dedicated to waste incineration flue gas purification. Background technique [0002] In the waste incineration flue gas purification system, powdered activated carbon is sprayed into the flue gas as an absorbent to absorb heavy metal aerosols and particles such as Hg, and injecting a sufficient amount of activated carbon can effectively reduce dioxin / furan concentration. [0003] The existing technology is to connect the activated carbon nozzle to the flue gas outlet pipe of the reaction tower, and rely on the flow of the flue gas to disperse it in the flue gas. The outlet of the activated carbon is connected to the flue gas outlet pipe of the reaction tower to maximize the Prolong the contact time of activated carbon in the flue gas with the flue gas, and finally the activated carbon is a...

AI Technical Summary

Problems solved by technology

The injection amount of activated carbon determines the efficiency of removing dioxin and Hg. According to relevant data, when the injection amount of activated carbon is 25mg / Nm 3 , the effective removal rate of Hg is about 87.5%, when the activated carbon injection rate is 50mg / Nm 3 At this time, the effective removal rate of Hg is about 92.5%, that is, the excessive injection of activated carbon cannot guarantee to increase the effective removal rate of Hg and other heavy metals in the same proportion, which not only causes waste, but also easily causes system failure.

The existing activated carbon injection control is mostly adjusted by a single frequency converter, and its feeding accuracy is poor, which leads to waste of feeding, high cost of use, and easy system failure

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