Talking about the sales of dust removal equipment

Electrostatic precipitator is a necessary supporting equipment for thermal power plants. Its function is to remove the particulate dust from the flue gas discharged from stoves or oil-fired boilers, thus greatly reducing the amount of dust discharged into the atmosphere. It is an important environmental protection equipment to improve environmental pollution and air quality. Its working principle is that when the flue gas passes through the flue in front of the main structure of the electrostatic precipitator, the flue gas is positively charged, and then the flue gas enters the channel of the electrostatic precipitator with multi-layer cathode plates. Because the positively charged flue gas and the cathode plate are mutually adsorbed, the particulate flue gas in the flue gas is adsorbed on the cathode plate and regularly collides with the cathode plate, so that the flue gas with a certain thickness falls into the ash hopper under the electrostatic precipitator structure under the dual action of self-weight and vibration, thus achieving the purpose of removing flue gas from flue gas. Due to the high power of general units in thermal power plants, such as 600,000 kW units, the amount of coal burned per hour is about 1.80t, and the amount of smoke and dust can be imagined. Therefore, the corresponding electrostatic precipitator structure is also relatively large. The cross-sectional size of the main structure of electrostatic precipitator used in general thermal power plants is about 25 ~ 40×10 ~15 m. If the height of ash hopper of 6 m and the spatial density of flue gas transportation are added, the height of the whole electrostatic precipitator is above 35 m. For such a huge steel structure, not only the static and dynamic analysis under the action of self-weight, flue gas load, wind load and earthquake load should be considered, but also the stability of the structure must be considered. The main structure of electrostatic precipitator is steel structure, which is all welded by section steel (as shown in figure 10-), and the outer surface is covered with skin (thin steel plate) and thermal insulation material, which is convenient for design, manufacture and installation. The structural design adopts layered form, each block is composed of several frame-type main beams, and the blocks are connected by main beams. In order to install the skin and insulation layer, the secondary beam is welded between the main beams. For such a huge structure, how to connect them according to physical objects will be very heavy in workload and number of units. According to the actual engineering design requirements and the main structure design of electrostatic precipitator, the structural strength, structural stability and maximum displacement of the cathode plate suspended from the main beam are studied emphatically. For the local area, the fatigue damage of the connection between cathode plate and main beam under long-term periodic impact is mainly investigated. Selection of the best frequency of soot shedding on cathode plate: the connection between structural surface skin (thin plate) and main and secondary beams under wind load and the best choice of stiffness between them. If only the main structure design of electrostatic precipitator is considered, they are spatial frame structures assembled by beam elements, then all kinds of loads to be investigated can be simplified as equivalent node forces acting on beam elements. Because of the properties of beam elements, each beam can be treated as a unit, and some secondary beams can be deleted, and the corresponding stiffness and load can be added to the main beam, which can greatly reduce the calculation amount. The finite element calculation model thus given is shown in figure 10-. However, it must be pointed out that the displacement mode of finite element beam element is actually given according to the calculation formula of straight beam in material mechanics. Under the assumption of material mechanics, the finite element analysis results of internal force and displacement at both ends of the beam are accurate, and its deformation form is half wave, which is obviously not enough for stability analysis. This is because if the beam is taken as the unit, the finite element stability analysis of its structure can only give the unstable critical load in the form of half wave, which may lead to the increase of the critical load of the structure. Therefore, we must pay attention to this problem when modeling the main structure of electrostatic precipitator. The solution is also simple. It is only necessary to divide some main beams that may cause instability into several elements (generally, a beam is divided into more than three elements), which avoids the half-wave instability form in stability analysis, and increases the reliability of calculation results.