The key to anti-corrosion and anti-wear of desulfurization equipment is wear and corrosion, which is common in daily operation but not discovered. After two years of replacement, a large number of products need to be replaced in order to prevent micro pollution. The use of resin deposition requires multiple inspections and technological innovations. Energy saving and consumption reduction are often reflected in the resin deposition of silicone gel. Disruptive technological innovations will solve the following problems for you: 1. What to do about corrosion and wear of slurry circulation pumps? 2. What to do about corrosion and wear inside absorption towers? 3. What to do about wear of the lining of desulfurization system pipelines? 4. What to do if the desulfurization nozzle is damaged? 5. What to do if the flue denitration equipment is corroded at high temperatures? 6. What to do if the gypsum pump ash pump is damaged
Lianyungang Shengyuan Technology Co., Ltd. is a high-tech enterprise that has successfully developed a water-cooled wall alloy anti-wear robot device, specialized materials, and droplet deposition process method with independent intellectual property rights for solving the wear of circulating fluidized bed boilers and on-site construction through years of independent research and development and process testing. It has obtained more than ten invention and utility model patents. Introduction to fully automatic alloy deposition and anti-wear technology process: 1. Deposition technology is a deposition process that uses a deposition heat source to deposit materials with certain properties on the surface of a substrate (workpiece), forming a metallurgical bond. Using the method of deposition to obtain a deposited metal layer with special properties such as wear resistance, heat resistance, and corrosion resistance on the surface of the welded component. The fully automatic alloy deposition system adopts both distributed converter deposition system and powder core alloy fuse deposition
Due to the significant impact of the flow velocity of the sticking flow on the wear of water-cooled wall tubes, and when the material properties and concentration cannot be changed, reducing the sticking flow velocity will greatly reduce the wear rate of the water-cooled wall. To this end, wear-resistant beam technology has been introduced, as shown in Figure 3. During the descent of the wall sticking flow, it encounters a blocking beam, causing the flow velocity to decrease. In this process, some particles change the flow direction, resulting in a reduction in the number of particles in the wall sticking flow and further reducing wear. However, traditional wear-resistant beams cannot solve the problem of "inverted eight character" wear at the root of wear-resistant beams while reducing the wear rate of water-cooled walls on a large scale. The main reason is that the downward and upward materials attached to the wall form a "vortex" above the wear-resistant beam; After the downward material adheres to the wall and touches the wear-resistant beam, some of the material bounces back onto the heating surface.
Cover the water-cooled wall around the combustion chamber with refractory materials to increase the temperature in the combustion area. Almost all combustion chambers in domestic thermal power plants use ordinary plastic materials, commonly known as castables. Although this type of castable is cheaper in price, it is prone to detachment, foaming, bursting, and has a poor heat transfer coefficient. If using blue mud technology for construction, it has thin walls, strong adhesion, no foaming, no bursting, and can extend the service life of two major maintenance periods, and the thermal conductivity is also very good.
The new technology of Bayer energy-saving warp and weft wear-resistant water-cooled wall is to install warp and weft plates vertically and horizontally in layers on the four walls of the furnace, effectively guiding the wall attached flow carrying materials to wash the water-cooled wall up, down, left, and right. This achieves the goal of changing the flow direction of the material flow, reducing the flow velocity of the material flow, isolating the adjustment and collision between the material flow and the water-cooled wall, greatly reducing the cutting wear of material particles on the water-cooled wall, and fundamentally solving the problem of water-cooled wall tube wear. The new technology of warp and weft type water wall anti-wear has been adopted by multiple boilers. Operational practice has proven that the installation of warp and weft type anti-wear on the water wall significantly reduces wear, and the annual wear of the water wall tube does not exceed 0.1mm during continuous operation. Especially in the transition zone of the casting material, no other anti-wear measures are used, and there is no need to worry about shutdown due to water wall wear and leakage
Thermal spraying principle: Thermal spraying uses various heat sources to heat and melt or semi melt inorganic coating materials; Then use high-speed gas to disperse and refine the inorganic coating material, and collide it with the substrate surface at high speed; The process of forming inorganic coatings. The scientific construction plan provides technical assurance for the quality and schedule of this project, ensuring the construction period. B's advanced construction organization and management provide management assurance for timely completion. The practical and feasible project schedule provides a plan guarantee for timely completion. According to the project situation, advanced and sufficient construction equipment, spare parts, and materials are allocated, and a complete logistics guarantee system is established to provide material assurance for the quality and quantity of the project to be completed on schedule. Experienced construction personnel, including technical experts, project managers, and operators of various trades, are
The use of nano silicon crystal adhesive has improved the anti-corrosion, wear and oxidation life of boilers; 2. Enhanced the operational capability of the boiler; 3. Due to the decrease in furnace temperature and the lower surface energy of nano silicon gel, large-scale corrosion of boiler water-cooled walls is prevented; 4. Avoiding the occurrence rate of boiler pipe deformation and rupture caused by the alternating cold and hot conditions during the operation of hydraulic soot blowing, and improving the safety and reliability of boiler operation; 5. Increased the adaptability of the boiler to the medium, improved the economic efficiency of boiler operation, and reduced the production cost of boiler operation. 6. Effectively reduce the generation of thermal NOx (about 5%). 7. The increase in heat absorption of the boiler after coating can improve boiler efficiency by more than 1%. 8. The decrease in flue gas temperature of the boiler causes the boiler induced draft fan, etc
Sandblasting provides active surface capabilities to coatings, such as lattice defects and plastic deformation, generating certain stress states to increase the adhesion between coating particles and substrate surfaces, and improving the micro metallurgical bonding ability between coating particles and substrate. The activation effect analysis is as follows: ① Sandblasting creates a certain residual compressive stress on the surface of the workpiece after repeated impacts by sand particles. Although the stress value is extremely small, it is beneficial for relaxing the thermal stress of the coating during the coating process, improving the bonding strength of the coating, and also increasing the fatigue strength of the workpiece. ② Coatings can remove organic pollutants and oxide layers from the surface of workpieces, and can increase the plastic deformation of metal surface grains and cause lattice defects, making the substrate surface in a state where chemical reactions are prone to occur, which helps to physically bond the coating particles with the substrate surface
The main factors affecting boiler corrosion include ① medium characteristics ② furnace temperature ③ air flow ratio ④ aerodynamic field characteristics. To prevent furnace corrosion, we mainly improve aerodynamic conditions and enhance the anti-corrosion properties of water-cooled wall surfaces during operation; Preventing corrosion in the upper part of the furnace mainly relies on reducing the flue gas temperature or improving the anti-corrosion properties of the water-cooled wall surface. 1. After using nano silicon crystal adhesive material on the water-cooled wall of the furnace, the heat absorption capacity of the furnace water-cooled wall will be appropriately increased. Analysis shows that the heat absorption capacity of the metal tube wall after using nano silicon crystal adhesive material is 7.89% higher than that of the metal tube wall without nano silicon crystal adhesive material. Therefore, the use of nano silicon crystal adhesive material on the water-cooled wall enhances the anti-corrosion margin of the furnace. 2. Using nano silicon crystal adhesive material on the water-cooled wall of the furnace, due to its smooth surface characteristics
When it was first put into operation, there was very little corrosion, but over the years, it was found that the corrosion was quite severe, especially in recent years, with several consecutive pipe bursts occurring within a year. This is mainly reflected in the flame breaking zone at the upper part of the furnace, which is about 70 square meters. If not dealt with in a timely manner, there is a possibility of replacing a large number of furnace tubes in a short period of time. Therefore, it is recommended that Hainan Yisheng Petrochemical Co., Ltd. take effective anti-corrosion measures as soon as possible to eliminate unnecessary losses. Otherwise, this not only increases the maintenance intensity but also incurs significant costs. Therefore, it is recommended to adopt the nano silicon crystal adhesive anti-corrosion technology invented by Lianyungang Shengyuan Technology. This technology has been used in boilers of all sizes across the country, achieving good economic benefits.
Surface pretreatment: 1.1 Firstly, inspect the pipes at the construction site and find defects such as pits, wear, and hard damage on the surface of the pipes. After the bidding party treats the pipe defects, the steel pipe surface is sandblasted to remove surface coke, slag, hard ash, rust layer, and oxide layer until a metallic luster is exposed. The sandblasting pressure is 0.6-0.8MPa. 1.2 The sandblasting range should be larger than the coating area of the pipe construction to ensure sufficient coverage for the next step of construction.
From the current pictures and combined with the feedback from the manufacturer's technical personnel, the corrosion of boiler water-cooled walls is a common phenomenon that has existed for many years. There are many reasons for this, mainly due to the oxidation of the combustion medium with the metal surface at high temperatures, which causes some mobile ions to "crack" and lead to corrosion. The reason why it occurs at the bend angle is that the furnace flue gas burns from bottom to top, with high density, strong flushing force, long residence time, and even the formation of a certain vortex shape at the bend angle.
