Desulfurization and oxidation Roots Fan Large vibration: model parameters of desulfurization oxidation roots blower
Model parameters of desulfurization roots blower, oxidation roots blower, desulfurization slurry pool oxidation roots blower, desulfurization oxidation roots blower
The oxidation roots blower is used to accelerate the oxidation rate. For example, the oxidation fans in ceramic plants and power plants oxidize calcium sulfite into calcium sulfate. Calcium sulfite can be oxidized under normal conditions, but in order to improve equipment efficiency, it is necessary to increase the oxygen supply to promote oxidation. At this time, engineers will choose Roots blower as the gas source.
Desulfurization Roots blower is located in the oxidation fan room, which is used to provide sufficient oxidation air for the slurry in the slurry pool of the absorption desulfurization tower. It is isolated by the manual switching valve of the spear shaped air nozzle. When isolating, the spray pipe can be flushed by opening the manual switch valve of the flushing water pipe. Since the use of desulfurization oxidation Roots blower to treat sewage, it has been widely used in the treatment of domestic sewage and industrial sewage at home and abroad due to its technical characteristics such as good effluent quality, stable operation, convenient management, etc. Roots blower is adopted for desulfurization and oxidation fan, each of which includes lubrication system, inlet and outlet silencers, air inlet chambers, inlet air ducts (including filters), distribution system in absorption tower and air ducts, pipes, valves, flanges and accessories between them and fans, motors, couplings, common foundation bases of motors and fans, local control cabinets, coolers, etc.
Xinqianshun is a professional supplier of oxidation roots blower, whose oxidation roots blower is mainly used in desulfurization and oxidation. Its product has sufficient aeration and stable performance, and can operate continuously for 24 hours. Its product flow ranges from 0.4m3/min to 370m3/min, and the pressure rise is 9.8Kpa-98Kpa. There are dozens of models with more than 100 specifications, and they are characterized by small size, large flow, low noise, stable and reliable operation. The corresponding mainstream models are: XQS50, XQS 65， XQS 80， XQS 100， XQS 125， XQS 125L， XQS 150, XQS 175， XQS 200B， XQS TSR200， XQS 225， XQS TSR250， XQS 300， XQS Type 350. The corresponding motor power ranges from 0.75kw-300kw. The selection of model parameters of Roots blower for desulfurization and oxidation depends on the sulfur content, COD and BOD requirements in the desulfurization process of the desulfurization tower.
Features of oxidation roots blower of desulfurization slurry pool:
1. The amount of air supplied to the oxidation ditch can be adjusted by adjusting the desulfurization roots blower device according to the changes in the quality and quantity of incoming water.
2. The length of the anoxic section and aerobic section of the oxidation ditch can be adjusted by starting and stopping the number of aerators to meet the needs of different inlet water quality.
3. The high oxygen utilization rate and power efficiency reduce the installed capacity and energy consumption of the aeration equipment, and prevent the activated sludge from settling in the oxidation ditch.
4. Larger water depth, generally 6.0m, can be used to save floor area. Meanwhile, as the aeration capacity of the aerator increases with the increase of water depth, it is conducive to power saving.
Function and process flow of desulfurization oxidation fan (desulfurization oxidation roots fan)?
In order to fully oxidize calcium sulfite slurry into calcium sulfate, the flue gas desulfurization device of thermal power plant is specially equipped with desulfurization oxidation fan to lead air into the absorption tower. Due to the requirements of high pressure, Roots fan is generally used as the oxidation fan of desulfurization and dust removal project. According to the liquid level of the absorption tower, i.e. the need of the fan head, it is divided into primary oxidation fan and secondary oxygen weathering.
1. In the installation stage, pay attention to the cleanness of the nozzle, and prohibit welding slag and sundries from entering the fan, otherwise the blades may be damaged. There is a sentence in the general manufacturer's instructions that "the size of medium particles shall not exceed half of the small working clearance of the fan". The working clearance is very small, and the sundries are far larger than this size. In particular, serious equipment failure will occur when the rebar head enters the interior.
2. During commissioning, generally run for a short time with no load, generally 30 minutes. Empty load means to open the vent valve (pressure relief valve), and then close the pressure relief valve to operate with load after the machinery is OK.
3. For the secondary oxidation fan, an intercooler is set, that is, the air comes out of the primary fan and passes through the intercooler before entering the secondary oxidation fan to reduce the air temperature at the inlet of the secondary fan. If the intercooler has poor cooling effect, the temperature of the secondary oxidation fan will be higher, Therefore, it is necessary to ensure that the cooling water of the intercooler is unblocked and has sufficient flow during commissioning and operation. The intercooler is generally controlled below 40 degrees. In some projects, pressure gauges are installed in the cooling water pipeline. In fact, what is concerned is the flow, so water meters or flow direction indicators can be used.
4. Noise. The noise problem of oxidation roots blower in desulfurization and dust removal project is a common problem in most domestic power plants. In order to reduce the noise, a sound insulation cover is often set outside the blower. However, the entrance and exit are outside the acoustic enclosure, which cannot fundamentally solve the noise problem. The inlet is equipped with a silencer, and the size of the silencer has a direct impact on the noise level. For the large capacity oxidation fan, the noise at the cooler is also obvious, and it is placed outside the acoustic enclosure. A power plant has conducted thermal insulation treatment on the intercooler, which has a certain effect on the sound insulation, but the effect is not ideal.
5. The pressure of the oxidation fan is rated on the nameplate of each oxidation fan. Its pressure rise depends on the back pressure of the system connected to the exhaust port. In actual operation, its pressure generally depends on the liquid level and slurry concentration of the absorption tower. If the distance between the liquid level and the mouth of the oxidation lance is 10 meters and the slurry density is 1150kg/m3, the oxidation fan should overcome the resistance of 115kPa slurry. It is forbidden to adjust the opening of the outlet valve to adjust the pressure and flow.
In normal operation, the pressure will not exceed the rated pressure, so it is necessary to overcome the pressure anomaly.
Pay attention to the following matters during the operation of oxidation roots blower in desulfurization and dust removal project:
1. The pressure depends on the liquid level and density of the absorption tower. Since the absorption tower is equipped with an overflow pipe, the liquid level can not be used as a key control point. The slurry density is critical. Generally, the slurry concentration is about 20% (30% in a few power plants). When the concentration deviates greatly from the design value and operates at a high liquid level, the oxidation fan outlet pressure will be high, It may even exceed the rated pressure. Too high concentration also increases the wear of equipment and pipelines. Therefore, the liquid level and slurry concentration of the absorption tower shall be controlled.
2. The oxidation air pipeline is blocked, which may also cause the outlet pressure to rise. Therefore, it is necessary to pay attention to whether the nozzle of the oxidation lance is scaling. If scaling blocks the pipe, the pressure will increase. The effective means to avoid scaling and blocking is to control the oxidation air desuperheating water (the dry and wet interface of the oxidation air is easy to structure if the temperature is too high); Focus on inspection of oxidation pipeline during maintenance
3. Check valve. To avoid reverse flow of oxidation air when the standby oxidation fan is running. Generally, the oxidation fan outlet has a special check valve. If the check valve fails, it cannot be fully opened when the fan is running, which will cause the fan to hold pressure. This probability is relatively small, so it is easy to be ignored
4. (Safety valve) The oxidation fan outlet is equipped with a safety valve protection device. When the pressure is abnormal, the safety valve will act to protect the equipment from damage due to abnormal pressure. The safety valve is in good condition, which is the key to protect the equipment
5. DCS pressure indication and current indication should be accurate, so that operators can accurately judge the actual operating conditions of equipment and systems. If the pressure rises, the current will increase sharply, but the current increase is often not enough to cause relay protection action, which requires special attention of operators.
