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Hot blast furnace is one of the main equipment for blast furnace ironmaking. Accurate technical parameters are the basis for ensuring the normal operation of equipment! With the scale of blast furnaces, the improvement of raw and fuel quality, the development of injection technology, and the improvement of blast furnace operation levels, the requirements for wind are getting higher and higher. The intermediate requirements for hot air stoves are to achieve high air temperature and long life. 1. Performance of refractory bricks for hot blast stoves Refractory bricks for hot blast stoves include clay bricks, silica bricks, and high-alumina refractory bricks (including mullite bricks, sillimanite bricks, andalusite bricks, kyanite bricks, and cordierite bricks). The requirements for refractory bricks in hot blast furnaces are low creep rate, good high-temperature strength, and good thermal shock resistance. In addition to meeting the above requirements, the checkered bricks used in hot blast stoves should also have a large heat capacity. In the design of hot blast stoves, to reasonably select refractory bricks, it is necessary to understand their performance parameters and usage environment parameters. Because accurate technical parameters are the basis for ensuring the normal operation of the equipment! Hot blast stoves use lightweight...
What do you need to know when buying refractory bricks? What kind of furnace lining can the purchased refractory bricks be used for? Can refractory bricks achieve practical application results? How do you purchase refractory bricks to achieve good results? Based on the actual situation, the issues that should be addressed when purchasing refractory bricks are expounded. Kiln site using refractory bricks 1. Understand the characteristics of the furnace According to the structure of the furnace, the working characteristics, and the operating conditions of each part of the furnace, refractory bricks are selected to achieve targeted selection. For example, the linings and bottoms of various smelting furnaces (such as furnaces and reverberatory furnaces) below the slag line are mainly subject to chemical erosion by slag and metal melt, followed by thermal stress caused by temperature mutations. The masonry generally uses magnesia and magnesia-chromium refractory bricks with good slag resistance. The above slag lines can use magnesia-alumina bricks, magnesia-chrome bricks, or high-alumina refractory bricks. 2. Ensure the normal operation and overall life of the furnace As the lining of the kiln, it must ensure its normal operation and overall service life. Reasonably configure various refractory bricks used in various parts of...
The service life of high-temperature kiln refractory bricks is closely related to many internal or external factors. For example, in the face of many customers, friends will ask, do refractory bricks absorb water? Can it be used when wet? Here I answer your question. Refractory bricks themselves have pores, so refractory bricks absorb water, and the water absorption rate is determined by their porosity. The pores are divided into three categories: one side is closed and the other side is connected to the outside world, called open pores; those that are closed in the sample but not connected to the outside world are called closed pores. The several sides of the traditional sample are called closed pores, which are called ventilation holes. Total porosity, or true porosity, refers to the total volume of pores in a sample as a percentage of the total volume of the sample. Generally, through holes and open holes are merged, and there are fewer closed holes, making it difficult to measure directly. Therefore, porosity is expressed in terms of open porosity, that is, apparent porosity. Apparent porosity refers to the total volume of open pores in the sample as a percentage of the total volume...
During the use of refractory bricks, they will be damaged due to physical factors, chemical factors, mechanical factors, and other factors. We will analyze them in detail one by one. Physical factors: During use, the refractory bricks crack due to rapid changes in temperature. Excessive temperature causes high-temperature melting. The refractory bricks shrink or expand after re-burning, causing damage to the furnace body and shortening the service life of the refractory bricks. The oven is improperly dried, the temperature rises too quickly, and the refractory bricks expand thermally too much. The furnace body is damaged and the service life of the refractory bricks is shortened. Chemical factors: chemical attack of slag (including chemical attack of ash). In general, the corrosion of the lining of the refractory materials in the smelting furnace is mainly caused by the chemical corrosion of the furnace gas. Mainly refers to the gradual oxidation and erosion of carbon refractory materials in high-temperature oxidation furnace gas, and chemical erosion occurs between refractory materials. When acidic and alkaline refractories are mixed together, fusible compounds form at the point of contact at high temperatures, causing both to erode simultaneously. The principle of electrochemical corrosion of carbon refractory bricks is...
What are the main uses of refractory bricks? The following is introduced by the technical department of Xinhongji Refractory. I hope it will be helpful to you. What are the main uses of refractory bricks? We will introduce the main uses of refractory bricks and hope to be helpful to customers who need to use refractory bricks. Refractory bricks are generally divided into two types: unshaped refractory bricks and shaped refractory bricks. Unshaped refractory materials: also known as castables, are composed of a variety of aggregates or aggregates and one or more binders, and have strong fluidity. Shaped refractory materials: Generally, refractory bricks are made, and their shapes have standard rules. They can also be temporarily laid and cut according to needs. The main uses of refractory bricks are as follows Refractory bricks are often used to build stoves—for example, boilers, furnaces (melting metal), hot blast furnaces, etc. The furnace should be built with refractory bricks. Refractory bricks are mainly used for lining high-temperature industrial kilns, such as iron and steel industry blast furnaces, hot blast furnaces, converters, non-ferrous metal reverberatory furnaces, rotary kilns, etc. It can be used as high-temperature building materials and structural materials for building kilns and...
The firing process of refractory bricks includes charging, firing, and discharging. The charging method and quality of refractory bricks have a great impact on the operation of the kiln and product quality. Xinhongji Refractory believes that it directly affects the heat transfer rate of the products in the kiln, the size of the combustion space, and the uniformity of airflow distribution, and is also related to the firing time and fuel consumption. The principle of kiln installation is that the brick stack should be stable, the fire path distribution should be reasonable, and the airflow should be evenly heated according to the distribution of the amount of bricks installed in each part. Products of different specifications and varieties should be installed at appropriate locations in the kiln to maximize the effective space in the kiln and increase the loading capacity. Carry out the kiln loading operation according to the pre-made brick loading diagram, which stipulates the brick loading height, arrangement, spacing, stacking positions of different types, the size and number of fire escapes, etc. The technical indicators of refractory brick loading include loading Density (T/m3), effective cross-sectional area (%), the heating speed of the product in the kiln is related...
The refractory ball itself has high heat resistance, so people often use it as a heating fuel for heating industrial furnaces. The refractory ball has a stable and continuous heating function, which can make the customer’s industrial furnace run continuously and make the products in the industrial furnace quickly dissolve. As for which fields will use refractory balls, this article starts from the following three aspects. 1. Chemical industry Cheap refractory balls are usually used in the chemical industry because the chemical industry often refines some chemicals. These chemicals need to dissolve at stable temperatures. If the temperature is unstable, the chemicals in the heating furnace will produce a certain degree of chemical reaction, which may affect the safety of the customer’s chemical plant and put the personnel and instruments inside the chemical plant in a relatively unsafe environment. 2. Natural gas fields Quality-assured refractory balls are available for natural gas applications. Because people in natural gas fields need to heat more things and the output is relatively large, refractory balls have more application opportunities in the natural gas field. Refractory balls help natural gas companies heat furnaces to varying degrees. Customers can change the number of refractory balls according...
The resilience and hardening degree of refractory materials. During spraying construction, due to the rebound and peeling of stone particles, unscientific coordination in brushing and patching inspections will reduce the utilization rate of refractory materials, reduce readiness, and even endanger the use of the operation village life. Wet spraying of the shrunken paint after flux extraction and continuous high-temperature fire brushing of the paint can greatly reduce the return of raw materials. In addition, adjusting the brush direction, spacing, and linear speed formula of the automatic spraying equipment according to the fabric structure and the size of the final particles on site is an important way to overcome the elastic state. In this method, a layer of mortar is sprayed onto the blasting surface before the granular material is applied. Resilience issues have also been addressed. Solving the rebound problem of refractory materials, also allows refractory brick manufacturers to understand the hardening degree of refractory materials. Under the necessary conditions of the corresponding external natural environment, the structure formed by the physical transformation between the refractory material and the flux has a corresponding tensile strength called a hard bottom. The entire process of lowering the ambient temperature, vitrification of the...
Prefabricated blocks and unfired bricks are formed products in amorphous refractory materials. They are non-flammable or light-burning products with excellent performance. They are new materials that are developing rapidly and widely used. Prefabricated blocks, also known as prefabricated components, belong to the category of amorphous refractory materials. The reason is that the raw material composition, preparation principle, binder, and additive use of non-burning bricks are the same as those of non-burning refractory materials, and they are no-burning or light-burning products. Compared with unshaped refractory materials constructed on site, this product has the advantages of accurate size, stable performance, short construction period, and low cost; compared with sintered refractory bricks, the product yield is high, no kiln is needed, energy saving, and low production cost, excellent performance. Therefore, prefabricated blocks and unfired bricks have broad development prospects. It should be pointed out that in recent years, non-fired bricks have developed rapidly, and new varieties have emerged one after another, forming a new prosperity. The development and application of new varieties of magnesia-carbon bricks, alumina-magnesia-carbon bricks, aluminum-carbon bricks, and Al2O3-SiC-C unburned bricks have led to the replacement of furnace linings of thermal equipment such as steelmaking converters, electric furnaces, and ladles, improving...
In a rotary kiln, ring masonry or staggered masonry can be used. Did you know? Of course, if you understand this method, you will know that the method we have used for a long time is the ring masonry method. If we use this method to make masonry, we will tell you about concrete masonry using this method. The construction of rotary kiln refractory bricks is divided into three points: 1. Arch method, 2. Support method, 3. Pasting method. 1. Arch method: The characteristic of the arch frame method is that the brick-laying machine can be used to lay bricks at one time without rotating the kiln body. When using the arch method to lay bricks, attention should be paid to: the arch frame is installed firmly, all parts are tightly connected, the operating function is good, the pushing device is flexible, the bracket is easy to move, the pneumatic or hydraulic system is sensitive, the pipeline is smooth and free of blockage, the arch frame moves smoothly and accurately, and strict compliance Baseline construction. 2. Support method: The characteristics of the support method are the top support method is generally used for bricklaying in small and medium-sized rotary kilns...
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