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I. Introduction
At present, the existing small and medium-sized domestic hundreds sintering machine, commonly used as a mixture of coke oven gas ignition or fuel, and a large number of blast furnace gas by-products are short and massive pollution of the environment. Making full use of these emission gas, stoves using replacement sintering point of the high-energy gas is of great economic and environmental value.
The blast furnace gas burning stoves point, I and Maanshan Iron & Steel Design Institute companies jointly developed the open cooperation from the early 1980s, has for Longyan steel, or steel, Wuhu steel, steel gantry, Hanzhong steel mills, steel Danyang plant, the Haixin Steel Plant, Qingdao Steel, Shijiazhuang steel mills, steel mills and other northern Taiwan has provided nearly 100 units, sintering machine area coverage of 18 m2 - 360m2, all the ignition achieved good results. Well received by the users.
Second, the point stove composition and working principle
WSD horizontal two-point preheating blast furnace gas stoves mainly by: GD-point stove, TG Direct flame burner, preheat beam, WS-double preheat furnace, supporting platform, air heat exchangers, gas heat exchanger, double preheat furnace burner and combustion chamber, the variable Park, chimneys, air pipes, gas pipes and fans, electric control system, and other components.
Blast furnace gas can not be directly used for sintering ignition key is the technical combustion temperature is too low to meet the requirements of ore sintering temperature. With the blast furnace gas calorific value BF introduction of new technology, its heat value has dropped to 700-800 Kcal/m3 not preheating combustion temperature of only 1230 ��, the temperature can be achieved only 870 �� C, far failed to meet the 1150 �� C. Ignition ignition temperature and short time in the 20-30 seconds of actual requirements, this is the last point at home and abroad sintering heat stoves are used for 1800-800 Kcal/m3 the value of mixed gas and coke oven gas reasons. In order to improve combustion temperature, oxygen-rich combustion can be used of course, such measures, but still the most economical way to blast furnace gas and combustion air preheating, improving blast furnace gas and combustion air temperature most effective. When the gas and air preheating temperature was 250 �� C -300 �� C and 450 �� C -500 �� C, gas combustion theory can reach 1640 �� C temperature, the corresponding temperature can reach 1150 �� C to meet the sintering furnace at the time of ignition and ignition temperature request.
3, WS-double of the main features of preheating furnace
3,1 can use existing point stove production workshop including track, which does not require occupants new venues.
3,2 Since WS-tight double preheat furnace GD-even point stove, so preheating the air, gas pipelines significantly shorten the length, not only cost savings, reduce costs, cut after preheating the air, gas temperature greatly reduce losses.
3,3 WS-double preheating Lu small size, light weight, high dwarf and thus facilitate the installation of maintenance, no large crane hoisting equipment.
3,4 in gas heat exchanger under the wind opened a box at the bottom outfall, gas cleaning facilitate lateral pipeline difficult to plug.
3,5 preheating temperature and high temperature heat, air preheating temperature of 450 �� C -500 �� C, gas preheating temperature of 250 �� C -300 �� C, air heat exchanger and higher than 400 �� C and heat-resistant stainless steel components used Steel production.
