By applying digital image processing techniques,the paper suggests to jointly use "whole furnace flame failure" plus "a whole furnace flame image verification" discrimination principles for confirming the extinction of furnace flames, describes the whole furnace monitoring and image processing systems. A successful industrial test performed on a domestic manufactured 200 MW set's boiler is reported.

The failure causes of FSSS of two 600 MW generating units in Huainan Coal fired Power Plant, Anhui Province were analyzed,the scanning power source circuit and indicating lamp power source circuit of the system were improved, and the logic of whole furnace flame monitoring was amended, so as to solve the adjustment and setting problems of flame monitoring detectors, ensuring the stable and reliable operation of generating units.

We creatively synthesize the imaging spectroscopy, computer digital image processing and the area CCD imaging technology, and after reasonable apparatus design, a testing system for whole furnace flame temperature distribution was set up.

Optimum operative technological parameters were determined by measuring the amount of slag splashed onto the furnace via cold model experiment. It was shown that optimum operative lance height of the whole furnace and the cone was respectively 155mm,165mm and 125mm,145mm or so on condition that slag amount was 11% and amount of top blowed gas flow was 23 0m 3·h -1 ,26 8m 3·h -1 .

It was found that the flame temperature went up a little with fuel/air injecting velocity ratio increasing, but the temperature uniformity went better in the whole furnace. The emission of NO decreased from 202€? 0 (3%O) at V/V=0.6 to 111€?

The influence of combustion flame height in tubular furnace radiant chamber on the temperature distribution of radiant chamber,and the proportion of radiant chamber heat transfer quantiity to whole furnace heat load,are researched.

The difference between the elevation of the lowest bottom tube center and the normal water level of drum of self-initiate whole furnace vaporization cooling equipment in Rolling Branch No. 2 of Luoyang Steel Works is only 2. 57m.

The whole furnace is divided into 4 gaseous zones and 18 surface zones.

An analytical method for the error of statistic simulation in the Monte-Carlo solution of 3-D furnace heat transfer is presented. The method begins with the analysis of radiative simulation between two small zones. Their behaviour is expressed as the process that the energy beams are emitted from point source and then do the random walk. Thus the expression of variance caused by the statistic simulation of the two zones is gained. In the whole furnace the radiative simulation is handled as the radiative...

An analytical method for the error of statistic simulation in the Monte-Carlo solution of 3-D furnace heat transfer is presented. The method begins with the analysis of radiative simulation between two small zones. Their behaviour is expressed as the process that the energy beams are emitted from point source and then do the random walk. Thus the expression of variance caused by the statistic simulation of the two zones is gained. In the whole furnace the radiative simulation is handled as the radiative simulation of many points sources which exist simultaneously. And this process is expressed being the simulating of the function which consists of a group of stochastic processes each corresponding, to one zone. Through this function we gain the expression of statistic simulations error in radiative transport term. On the basis of that, the expressions of simulations error in. furnace heat flux distribution and temperature distribution are discovered.An error analysis for the Monte-Carlo solution of a furnace of large boiler (HG-410/100-6 type) is carried out using the error expressions mentioned above. The result shows that owing to the difference of the position and physical parameters of the zones, the statistic error in every zone is different. While we make 1548 zones in the furnace and 6×105 energy beams in total the maximum fractional error of radiative simulation in the gas area is only 4 to 5 present at burning center but 20 to 28 percent at furnace outlet, and on the furnace wall is 10 percent at burner area, but 25 .to 30 percent at furnace outlet (Fig., 1,2). The maximum error of gas temperature is 20 to 60℃, and the maximum calculating error of surface temperature on the sooted furnace wall is 130 to 200℃ (Fig. 3).This paper discussed three problems. First, in the case of furnace heat transfer the va- riation of the total number of energy beams will produce different effect on the zones which possess different, positions and different properties. As to China made 410 t/b boiler if the furnace is divided to 1600 zones it seems proper to choose the total number of energy beams near s×105. Second, the example calculating shows that, the technic of "N∞ energy" is better than technic of "N = const". Third, in the present enginerring applying if the statistic error should be remained near the original level, the total number of en-ergy beams must be increased proportionally to the increase of furnace zones.

Recycle and utilization of waste heat in exhaust fume of industrial furnaces is the efficient way enhancing furnace heat efficiency and saving fuel used by furnace. But, its efficient utilization extent has a bearing on component parts of whole furnace. With point of systematic energy-saving, this paper describes the relations, and puts forward some countermeasure of systematic energy-saving in waste heat utilization system of exhaust fume from concrete analysis of these relations.

he theory research and practical application of Ti furnaceprotecting technique at home and abroad are introduced. Several processes are proposed that using this technique to whole furnace; protecting furnace with carbon - bearing cold- setting Ti agglomerate; protecting furnace by spraying mixture of concentrated Ti powder and carbon powder etc. It is suggested to make a developing test.