The furnace is one of the most commonly used equipment in the petrochemical industry and is the most energy-consuming device. At present, there are more than 60 large and small furnaces in the company's production facilities, the total load is more than 800MW, the maximum heat load of a single unit is 142MW, and the energy consumption of the heating furnace accounts for more than 30% of the company's energy consumption. If the heating furnace added by the 8 million t refinery expansion project is added, the energy consumption will be even greater. Therefore, it is important to pay attention to the technical transformation of the heating furnace in the old equipment and the new technology application of the new equipment heating furnace to improve the thermal efficiency of the heating furnace, which is the key to reducing the energy consumption of the equipment and improving the economic benefits. When the density of the newly sprayed high-aluminum and general-alloy fibers is 215kg/m3, the total weight of each furnace is reduced by about 15t. 3 The thermal efficiency has increased significantly. After the transformation, the lining has good integrity and tight sealing, and the amount of air leaking into the furnace is relatively reduced. The oxygen content in the furnace is reduced from 12% to less than 6%, and the furnace is bright and the combustion condition is good. After the transformation, the thermal efficiency has reached about 90%, which is about 8 percentage points higher than before the transformation. 2. HT-1 high temperature radiation coating application The energy saving mechanism of HT-1 high temperature radiation resistant coating is: Next page Brass fasteners are used for their physical and aesthetic properties. Brass is utilized due to its high thermal conductivity and corrosion resistant properties, it is suitable for use in hot and cold environments, and resistant to water corrosion, making it a staple of industries such as heating and plumbing. Brass fasteners are largely non-magnetic (like any fastener, slight magnetic properties can develop during the manufacturing process) and resistant to tarnishing. Brass Nut,Adjustable Brass Nut,Brass Strat Nut,Brass Cap Nut Taizhou Hongchuang Hardware Co., Ltd. , https://www.taizhouhongchuang.com
First, the status quo analysis
The heat loss during the operation of the heating furnace is mainly the loss of smoke and heat. The loss of effective energy is mainly in the irreversible process of combustion heat transfer. Therefore, the focus of the thermal efficiency of the furnace should be placed on the heat loss of the combustion and radiant sections.
At present, most of the company's heating furnaces due to outdated equipment, lining aging, falling off, corrosion and perforation of steel plates and other reasons, resulting in increased heat loss in the furnace, local overheating and overheating, causing thermal efficiency to decline, thermal efficiency is generally 80% ~ 88% Between, the original design value or company assessment requirements are not met, which not only seriously affects the safe operation of the equipment, but also restricts the reduction of unit processing fees and directly affects the economic benefits of the enterprise.
Now, relying solely on the traditional "three-door-one-board" operation, it is difficult to obtain obvious effects by controlling the oxygen content and the exhaust gas temperature in the flue gas, as well as repairing and repairing the equipment. Therefore, the application of new technologies is an effective way to improve the thermal efficiency of heating furnaces. According to the technology developed at home and abroad, it is decided to use refractory fiber spraying technology and spray HT-1 high temperature radiation coating on the inner surface of the heating furnace to transform the heating furnace.
Second, technical reform measures
1. Refractory fiber spraying application
At present, refractory fiber has been widely used in metallurgy, petroleum, chemical, machinery, electronics, construction, light industry and other industries because of its low density, small thermal conductivity, good thermal stability and strong thermal shock resistance. Preferred materials for insulation, heat insulation, sound insulation and fire protection.
At present, the application of domestic refractory fiber is to form a lining layer on the site by using a layering method, a superposition method, a veneer method, etc. for secondary products such as felts, blankets, and prefabricated blocks. The main disadvantages of these methods are:
(1) There are seams between the fiber profiles, the overallity is poor, and the corners and profiled faces are more prominent;
(2) Due to the heat shrinkability of the fiber during use, it is easy to cause a through gap. Due to the above disadvantages, the high-temperature flue gas in the heating furnace overflows along the gap, which increases heat loss, reduces thermal efficiency, and seriously affects the use effect and safe operation of the equipment.
The refractory fiber spraying technology directly sprays the pretreated loose refractory fiber cotton onto the surface of the furnace wall or the furnace shell through a special fiber spraying device. And in the spraying process, the special high-temperature bonding agent is uniformly sprayed into the fiber flow, and the two are fully mixed and sprayed together on the construction surface.
The main features of the refractory fiber spray lining compared to the fiber lining obtained by the other methods described above are:
(1) The lining obtained by one-time integral spraying has no seam, and because of the three-dimensional network structure formed by the scattered refractory fiber cotton in the spraying, it provides a solid and uniform overall structure, and provides more perfect heat insulation protection for the heating furnace. ;
(2) reducing the amount of anchors and effectively preventing wear;
(3) When spraying, as long as the surface of the furnace wall is slightly treated, it is not necessary to level the substrate like a fiber blanket or a prefabricated block, and the construction is convenient;
(4) For the spraying of the profiled surface, the spraying difficulty is reduced and the work quality is improved.
Hydrogen cracking workshop No. F301 and F302 two heating furnaces, the original furnace lining uses a composite lightweight refractory castable and a special fiber blanket bonding structure. Due to the defects in the design of the tiling structure of the radiant chamber lining, the construction of the deformed part is difficult, the adhesive is not uniformly applied during the construction, and the adhesive itself is not sufficiently adhesive, resulting in serious lining fall off in the first cycle of the first cycle. The air is pulled out from the gap between the steel plate and the castable, causing the drum to be seen at the fire window, and the paint on the outside of the furnace wall is peeled off. The inner side of the steel plate on the outer wall of the furnace produces H2S low temperature dew point corrosion, and the average temperature of the side wall steel plate reaches 78 ° C. The thermal efficiency is only about 82%.
According to the actual situation and design parameters of the temperature gradient of the lining layer of the heating furnace, the composite lining with a high aluminum layer thickness of 60 mm and a general aluminum layer thickness of 170 mm, the total thickness of the lining is 230 mm. The properties of the fiber materials used are shown in Table 1. 
HT-1 high temperature resistant radiation coating, known as HT-1 polycrystalline mineralized black ceramic energy-saving coating, is a new type of energy-saving material widely used in recent years. Its main components are shown in Table 3. It can be applied to the surface of refractory brick and refractory fiber insulation material in the furnace kiln. It has anti-heat vibration and anti-flaking, enhances the airflow resistance of the furnace wall, and prolongs the life of the lining, improves the thermal efficiency and reduces the energy consumption per unit of product. Characteristics and functions. The main technical indicators are shown in Table 4. 
(1) When the inner surface of the furnace wall is coated with the coating, the emissivity is increased from 0.75 to 0.90. According to Boltzmann's law, when the emissivity of the furnace wall increases, the furnace wall temperature under the same heating conditions Inevitably, the radiation capacity of the furnace wall surface increases with the fourth power of the thermodynamic temperature. After spraying the high temperature radiation coating on the inner wall of the furnace, the thermal conductivity is significantly reduced, and the temperature of the outer surface of the furnace is lowered, thereby reducing the heat loss of the heat dissipation of the outer wall of the furnace, thereby reducing fuel consumption and improving thermal efficiency.
(2) HT-1 high temperature radiation coating not only has a high emissivity, but also improves the distribution of high radiant energy spectrum, and also has a radiant energy spectrum distribution that matches the strong absorption of infrared rays by various substances, thereby improving radiant energy. Utilization rate.
Brass fasteners are suited for some marine environments, including brackish water and slow current sea water; brass in this environment develops a protective green coating. Brass fasteners are also commonly used with wood applications, as the golden coloring blends well with the tan wood. Brass is a softer metal and must be used with care, always drilling pilot holes and using driver bits that fit the head of the screw precisely to prevent stripping. Brass Bolts also require a pilot hole be driven before installtion.