The kiln is the heart of a glass factory, and its operation is directly related to the product quality and economy of the factory. In recent years, with the introduction of many new energy-saving technologies for kilns abroad, my country's glass kilns have improved in structure and energy saving, reaching a new level, but at the same time, the requirements for kiln operation and kiln baking process are becoming more and more stringent, especially the preliminary work of kiln operation - the kiln baking process is even more important, because the quality of the kiln baking is directly related to the life of the kiln. This article describes the kiln baking process of a modern energy-saving fuel oil glass kiln as follows for your reference.
1. Basic situation of the kiln
The kiln adopts more than a dozen technologies such as large flame space, full separation, long flow liquid hole, large storage ratio, high heat preservation, full automatic control, deep clarification, and additional kiln sill.
2. Preliminary work of kiln baking
Before baking the kiln, you must do all the preliminary work. For example: determine the heating plan, make good arrangements for people and things, and do a good job of various inspections of kiln points, etc.
2.1 Kiln baking form
The kiln baking form of this kiln adopts the hot air kiln baking method which is currently popular at home and abroad. The heat source is light diesel oil. A kiln baking device is used to bake the kiln at the feeding port. The hot air is sprayed in the direction of the liquid flow hole and the direction is changed while baking the kiln (generally, manufacturers change the direction at 800℃ or when the fire is too high).
2.1.1 Heating and feeding plan
The heating plan of the melting part (based on the thermocouple in the middle of the large swirl)
The heating plan of the working part can refer to the heating plan of the melting part and the actual situation.
3. Kiln baking process and problem handling
Since the melting area of the kiln is not too large, only one kiln baking device is used in the kiln baking. The hot air enters the kiln from the feeding port and sprays in the direction of the liquid flow hole. After the kiln was fired, the direction was changed every half an hour. There was a power outage in the afternoon of that day. Due to sufficient preparation, no losses were caused. When the temperature reached 876℃, it was difficult to heat up with the kiln, so the fire was turned on. After that, the arch shrank greatly at 1100℃, shrinking by about 60 mm. This is because the material used for the kiln arch is silica brick, and the main component of silica brick is quartz. Quartz has a complex isomorphism phenomenon. There are two types of crystal transformations: fast reversible transformation and slow irreversible transformation. The transformation process of α-quartz-α-tridymite and α-quartz α-quartz belongs to the latter, and is accompanied by a large volume change. Therefore, at the corresponding temperature (around 870℃, 1100℃, the kiln should be baked with special care. The heating speed is basically carried out according to the plan, which is relatively smooth. After baking the ramming material at 1460℃ for 6 hours, the material is added, and the material is discharged 80 hours after the addition. The relevant records of the kiln baking process are shown in Table 5
3.1 Problem handling and solution
3.1.1 Melting section large arch (siliceous material masonry): 8990mm is divided into two sections (average), leaving three seams: 40mm (both sides); 60mm (middle seam), which has basically expanded after baking the kiln, and the remaining gaps are filled with sealing materials; the heat storage chamber arch (siliceous material masonry) is 4680mm long, leaving two seams, both 60mm, baking The kiln has basically expanded after the kiln, and the gap is filled with sealing material; the gap between the kiln discharge port and the supply channel is designed to leave a 19mm gap, and 40mm is left during construction. In fact, the kiln expands by 45mm after baking.
3.1.2 Because the silicon refractory material was not sintered well, when the temperature was raised to 1100℃, the large crown shrank greatly (about 60mm). Because it was discovered in time, the danger was dealt with, otherwise the consequences would be disastrous. Therefore, no matter which factory (familiar or unfamiliar) of silicon refractory materials is used when baking the kiln, it must be paid attention to at 1100℃.
3.1.3 When baking the kiln, not only the top screws of the large crown and the top crown of the regenerator should be checked, but also the other top screws should be checked at any time. During this kiln baking, the top screw at the kiln edge of the pool wall was not loosened in time, causing the pool wall brick on one side (kiln edge side) to break.
3.1.4 This kiln baking adopted the method of reversing after ignition, which has been proven to be very effective, especially for newly built kilns (relatively humid temperature).
3.1.5 When the kiln was heated to 876℃, it was difficult for the entire kiln to heat up, so a heavy oil gun was used to start heating (overheating), but the process was not very smooth, mainly because the oil gun and the pipes below it were easily blocked after reversing. The main reason was that the construction personnel did not perform the construction according to the design, added a bend to the oil pipe, and replaced the valve with a needle valve (small diameter), and the heavy oil had a high viscosity. Therefore. In view of the above reasons, the site immediately improved according to the original design and achieved success. The above lessons are also quite profound. Before ignition, the pipeline system must be thoroughly checked to ensure smooth fire.
3.1.6 During the kiln baking process, some gaps appeared between the individual pool wall bricks and the flow hole bricks. The site was immediately treated, and a certain amount of top screws and solid irons were added, and some air ducts were added near the flow hole to ensure safety.
3.1.7 After the kiln was baked, the entire kiln was repaired, sealed and insulated (because when baking the kiln, the large crown and the top crown of the heat storage chamber were temporarily insulated with calcium silicate boards).
Some articles on this site are taken from the Internet. If there is any infringement, please contact us to delete them immediately.
Wechat Us 
