System and method for adjusting heat exchange area of ​​heating surface of boiler economizer to ensure safe flue gas temperature of scr

Abstract

The invention discloses a regulating system and method for the heat exchange area of a heated surface of a boiler coal economizer capable of ensuring the SCR (selective catalytic reduction) safe smoke temperature. The regulating system comprises a plurality of electromagnets, a plurality of iron slide blocks, a plurality of position limiting pins and a control device, wherein each electromagnet is respectively connected with the control device, and the control device controls the current of the electromagnets, so that the electromagnetic force generated by the electromagnets is controlled, each iron slide block is arranged on a straight pipe section in transverse arrangement in a coal economizer screen pipe in a sleeving way, and is positioned in the magnetic force range of the electromagnets, the position limiting pins are welded at the lower parts of the corresponding straight pipe sections provided with the iron slide blocks, the welding positions of the position limiting pins are position limiting point parts of the iron slide blocks, and the iron sliding blocks positioned on the same straight pipe section are stopped when touching the position limiting pins in the sliding process. The regulating system has the advantages that the smoke temperature control problem can be solved, and the safe operation of a subsequent SCR denitration system is ensured for meeting the existing thermal power plant pollutant discharge standard. Meanwhile, the invention discloses the regulating method of the regulating system.

Description

technical field [0001] The invention belongs to the emission reduction technology of coal-fired boilers, and specifically refers to a system and method for adjusting the heat exchange area of ​​a heating surface of a boiler economizer for ensuring SCR safe smoke temperature. Background technique [0002] With the rapid development of my country's economy, the installed capacity of thermal power units is getting larger and larger, coal consumption is also increasing, and the accompanying pollution problem is also increasing. The emission of nitrogen oxides from coal-fired power plants has become the focus of my country's pollution control. direction. The flue gas denitrification technologies in my country mainly include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). [0003] The performance of the catalyst directly affects the overall denitration efficiency of the power plant and determines the operating cost of the SCR. The flue gas tempera...

AI Technical Summary

Problems solved by technology

When the flue gas temperature is lower than the suitable temperature of the catalyst, the catalyst will have a side reaction, which will cause NH3 to react with SO3 and H2O, and the product will adhere to the surface of the catalyst, reducing the catalytic activity

Images