1、 What are the considerations for selecting materials for desulfurization and dust collectors? 1. Heat resistance requirements: The flue gas temperature difference is large, and the flue gas temperature after wet flue gas desulfurization is between 40 ℃~80 ℃. The maintenance or non operation of the desulfurization system and unit operating conditions should be met. When the chimney flue gas temperature is between 130 ℃~150 ℃, the lining should have the ability to resist temperature changes, and the environment with frequent temperature changes should not crack and be durable. 2. Satisfy the requirements for complex chemical environments: The chemical environment is complex, and the acid content in chimney flue gas is high, which condenses on the lining surface and is corrosive to most building materials. Therefore, the lining material is required to have strong acid corrosion resistance. 3. Good performance: Smoke contains a large amount of dust, and under the action of corrosive media, the actual wear and tear may be significant, so good materials should be required. 4. Some bending resistance performance: Due to the characteristics of high altitude, considering some chimneys, including the movement of the earth itself, earthquakes, and wind loads, especially the website of high chimneys may experience swinging angle deflection or deviation, and some uncontrollable mechanical functions may occur during chimney installation and transportation, so we request materials with bending resistance performance. 5. Having good bond strength: The material has a bond strength, which not only refers to the high bonding strength of the material itself, but also the bonding strength between the material and the substrate. It also requires the material to be resistant to cracking, delamination, or peeling, with good adhesion and impact strength, and excellent performance. Usually, we require the base of the coating material and the steel structure of the adhesive relay to reach at least 10MPa. 2、 The development of desulfurization and dust removal equipment includes industrial waste gas desulfurization treatment equipment and tower equipment, namely desulfurization and dust removal equipment;. The desulfurization and dust collector is widely used in granite masonry and applies the principle of water film desulfurization and dust removal. It is also known as granite water film desulfurization filter or ephedrine water film desulfurizer. Its advantage is that it is easy to maintain and can achieve dust removal and desulfurization effects by mixing different dust collectors. With the development of glass and steel technology, desulfurization and dust collectors are gradually being replaced by fiberglass. Compared with granite desulfurization and dust collectors, fiberglass desulfurization and dust collectors have lower costs, simpler processing, good corrosion resistance, and lighter weight, making them the development trend of desulfurization and dust collectors in the future. In addition, stainless steel has three major advantages, namely,,, and is one of the important trends in desulfurization and dust collectors. After improvement, various types of desulfurization and dust removal equipment have been developed, including Venturi type, plate type, cyclone column type, floating ball type, sieve plate type, and pneumatic emulsion type. The equipment technology is mature and each has its own advantages and disadvantages. Enterprises can choose different types according to their needs. 3、 Why is it necessary to remove fog after desulfurization with a desulfurization and dust collector? We know that desulfurization and dust collectors usually remove fog after desulfurization. Why do we do this? Due to the lack of oxygen content in the flue gas, calcium sulfate is generated through oxidation reactions. Therefore, a forced oxidation system needs to be supplied to supply oxidation air for the absorption tower slurry. The oxidized air is evenly dispersed into the absorption tower slurry pool through the oxidized air distribution network. Each absorption tower is equipped with 5 oxidation air dispersion branch pipes, each with many small holes. Oxidation air is sprayed out from these small holes and forms fine air bubbles, which are evenly distributed to the cross-section of the absorption tower's reaction slurry pool. Then, the bubbles rise to the surface of the slurry pool by buoyancy, and during the ascent, they mix thoroughly with the slurry and undergo oxidation reaction, thereby achieving a high oxidation rate. If the oxidation effect of the slurry is not good, calcium sulfite will simply enter the defogger with the droplets and form hard scale on the defogger blades. The desulfurization and dust collector will have an impact on the operation of the entire desulfurization system to a certain extent, so special attention should be paid during use. There will be other components in the mist, which will cause serious corrosion to the flue and other components with changes in temperature, causing damage to the desulfurization and dust collector. 4、 If there are flammable and explosive hazardous materials around the dust removal system or dust removal area of the desulfurization and dust collector during maintenance, measures should be taken for the equipment pipelines of the dust collector. When installing high-temperature pipelines in the environment, if it is necessary to limit the indoor temperature, insulation and heat preservation measures should be taken indoors. When the noise of the desulfurization and dust collector is relatively high, it is also necessary to cover it with sound insulation. Take measures for high-temperature pipelines and equipment that require frequent operation and maintenance on the work platform side. When it is necessary to recover heat energy from the treated flue gas, it is also necessary to tightly insulate the pipelines and equipment. When the ambient temperature causes the flue gas to condense, condense, or freeze inside the pipelines and equipment, or when dust becomes damp and clumped, the pipelines need to be insulated, and if there are any, appropriate parts should be heated. Maintenance of desulfurization and dust collector: 1. Due to the high unit steel consumption of the dust collector, a better method for installation is to gradually increase the material thickness from the upper part of the cylinder downwards. 2. During the operation of the desulfurization and dust collector, the airflow inside the body will form vortices. Once vortices are formed, they are almost impossible, especially when encountering changes in the temperature and velocity of the dusty gas, as well as possible condensation on the pipe wall. Regular cleaning of the dust removal pipeline is necessary. 3. The cover plate of the cleaning hole and the wall of the desulfurization and dust collector should be tightened with bolts or other clamping devices, and there should be rubber plates or rubber bands as pads between the cover plate and the dust collector. 4. The position of the dust collector cleaning hole should be on the side or upper part of the pipeline, and all cleaning holes should be tightly sealed without air leakage. 5. The difficulty of operation and management is high, the water level is difficult to control, the dust removal effect cannot be achieved when the water level is low, the water intake of the induced draft fan is high, and the acid-base neutralization is difficult to control.
