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Denitration technology

发布日期:2018-05-21 浏览次数:9423

1. Technical core

(1) Denitration technology

A. Medium and low temperature SCR denitration technology

Brief introduction of SCR medium and low temperature denitration process

  Coke oven flue gas mixes fully in the flue with ammonia gushing out of the ammonia injection grid set in front of the inlet of the SCR reactor, then the well-mixed flue gas enters into the inlet of the SCR reactor, passes through the flue gas equalizer (to filter cohesive particles, tar, ammonium hydrogen sulfate, etc.) into the SCR reaction zone where it reacts with medium- and low-temperature catalyst for SCR denitration reaction and the NOX-removed flue gas is ejected from the outlet of the SCR reactor. When the system is running for a certain period of time, in order to stabilize the activity of the catalyst (to prevent the deposition of more viscous ammonium bisulfate on the surface of the catalyst), the in-situ regenerative thermal desorption system is used to regenerate the catalyst. The flowchart of medium and low temperature denitration process is shown below.


(1) High denitration efficiency, up to more than 90%;

(2) Strong adaptability to coke oven load change;

(3) Low SO2/SO3 conversion rate and NH3 escape rate;

(4) The catalyst used has wide temperature window, good activity, low inactivation rate and long service life;

(5) The air flow in the denitration system is evenly distributed with small resistance;

(6) Mature technology, reliable operation, high security, easy to install and maintain.


B. Integrated technology of denitration and dust removal

C. Rotary heat transfer SCR denitration technology

  Low temperature flue gas of sintering machine is first heated in hot blast heater, then mixes fully in the flue with ammonia gushing out of the ammonia injection grid set in front of the inlet of the SCR reactor and the well-mixed flue gas enters the inlet of the SCR reactor, passes through the flue gas equalizer (to filter cohesive particles, ammonium hydrogen sulfate, etc.) into the SCR reaction zone where it reacts with medium and low temperature catalyst for SCR denitration reaction and the NOX-removed qualified flue gas transfers heat to unheated sintering machine flue gas by heat exchanger.

  which is heated up to a specified temperature with the help of heat blast heater and then is subject to denitration at medium and low temperature, in such a cycle the flue gas is treated. The up-to-standard gas after heat exchange is discharged into the atmosphere. When the system is running for a certain period of time, in order to stabilize the activity of the catalyst (to prevent the deposition of more viscous ammonium bisulfate on the surface of the catalyst), the in-situ regenerative thermal desorption system is used to regenerate the catalyst. The flowchart of medium and low temperature denitration process is shown below.


D. High temperature SCR denitration technology


E. SNCR denitration technology