MY156010A - Targeted reagent injection for slag control from combustion of coals high in iron and/or calcium - Google Patents

Abstract

DISCLOSED IS A PROCESS THAT INCREASES THE OUTPUT OF A COMBUSTOR (10) FIRED WITH COAL HAVING HIGH IRON AND/OR CALCIUM CONTENT, BY REDUCING THE TENDENCY OF SLAG TO FORM ON HEAT EXCHANGE SURFACES AND CHANGING THE NATURE OF THE SLAG TO MAKE IT EASIER TO REMOVE. THE PROCESS INCLUDES COMBUSTING A SLAG-FORMING COAL, HAVING HIGH IRON AND/OR CALCIUM CONTENT, WITH AN OVERALL EXCESS OF OXYGEN; MOVING THE RESULTING COMBUSTION GASES THOUGH HEAT EXCHANGE EQUIPMENT UNDER CONDITIONS WHICH CAUSE COOLING OF SLAG FORMED BY BURNING THE FUEL; AND PRIOR TO CONTACT WITH SAID HEAT EXCHANGE EQUIPMENT, INTRODUCING AQUEOUS ALUMINUM TRIHYDROXIDE IN AMOUNTS AND WITH DROPLET SIZES AND CONCENTRATIONS EFFECTIVE TO DECREASE THE RATE OF FOULING, AND PREFERABLY, INCREASE THE FRIABILITY OF THE RESULTING SLAG. DESIRABLY, THE ALUMINUM TRIHYDROXIDE REAGENT IS INTRODUCED IN THE FORM OF AN AQUEOUS LIQUID AND COMPUTATIONAL FLUID DYNAMICS IS EMPLOYED TO DETERMINE FLOW RATES AND SELECT REAGENT INTRODUCTION RATES, REAGENT INTRODUCTION LOCATION(S), REAGENT CONCENTRATION, REAGENT DROPLET SIZE AND/OR REAGENT MOMENTUM. IN A PREFERRED ASPECT, THE FEED RATE WILL UP TO ABOUT 2.72 KG (6 POUNDS) ATH PER TON AND PREFERABLY WITH UP TO ABOUT 0.91 KG (2 POUNDS) MG(OH)2 PER TON OF COAL. A PROCESS IS ALSO PROVIDED FOR CLEANING AND MAINTAINING CLEANLINESS OF A COMBUSTOR (10).