Jiangsu Nantong fiberglass wet flue gas desulfurization tower desulfurization precipitator Zhenjiang

ESP is used to remove harmful dust in the gas phase equipment, increase desulfurization effect on this basis, that is, desulfurization precipitator. Desulfurization dust is generally wet desulfurization precipitator, wet desulphurization water film desulfurization dust, impact water bath desulfurization and dust removal. Advantages wet dust is easy to maintain, and can be formulated in various dedusting agent, at the same time achieve dust removal and desulfurization (nitrogen) results; drawback is that dust was treatable, may lead to secondary pollution. After years of improvement, has developed into a venturi type, cyclone type, the cyclone columnar, float type, plate type and other types of water film desulfurization precipitator, equipment technology matures, each with advantages and disadvantages companies to follow their own need to use different types. Factors considered in the selection of a dust collector, air volume (Q) Flow rate refers to the removal device in the unit time can the volume of purge gas. Units of cubic meters per hour (m3 / h) or standard cubic meters per hour (Nm3 / h). Baghouse design is one of the most important factors. Designed or selected according to the amount of wind baghouse, generally can not filter run in the wind exceeds a predetermined amount, otherwise, the bag easy to plug, shortened life expectancy, significant upward pressure loss, collection efficiency should be reduced; but they can not The selected air volume is too large, otherwise the increase in investment in equipment and floor space. Reasonable alternative treatment capacity is often based on technology and experience to decide. 2, temperature for the baghouse, its use temperature depends on two factors, the first is the media's maximum temperature, and the second is the gas temperature must be above the dew point. Currently, due to the large selection of glass filter, the maximum temperature up to 280 ℃, higher than the temperature of the gas cooling measures must be taken for the gas below the dew point temperature must take measures to raise the temperature. Now more used PPS filter temperature at 170 degrees. To bag filter, the use of the relationship between temperature and dust removal efficiency is not obvious, it is different from the electrostatic precipitator for the electrostatic precipitator, the temperature change will be affect the dust collection efficiency than the resistance and other factors. 3, the inlet dust concentration that is the entrance of dust concentration, dust from the process which is the point of the decision, in the design or selection baghouse, it is another important factor in treatment capacity is second only. In g / m3 or g / Nm3 to represent. For the baghouse, the inlet dust concentration will directly affect the following factors: ⑴ pressure loss and cleaning cycle. Inlet concentration increases, the same filter area fouling fast speed, pressure loss increases, the result is to be increased cleaning frequency. ⑵ bag and box wear. In the case of dust with strong abrasive, the wear amount can be considered proportional to the concentration of dust. ⑶ advance whether the necessary dust. Dust is dust in advance before the entrance to an additional level of dust removal equipment, also known as pre-dust. ⑷ rows of gray ash capacity device. Ash ash means the ability to be able to discharge all should accept whichever dust, dust inlet dust concentration multiplied by an amount equal treatment capacity. ⑸ operation. Baghouse is divided into positive and negative two modes of operation, in order to reduce fan wear, large inlet concentration should not use positive pressure mode of operation. 4, outlet dust concentration at the outlet dust concentration refers to the concentration of dust emissions, the representation with the entrance of dust concentration, dust concentration should be the size of exports in local environmental requirements or user's requirements prevail, baghouse emission concentration general can reach 50 g / Nm3 or less. 5, the pressure loss of the dust bag pressure loss refers to the gas inlet to the outlet from the filter pressure drop, also known as resistance. Bag dust pressure loss depends on the following three factors: pressure loss ⑴ device structure. ⑵ filter pressure loss. And the nature of the relevant media (such as porosity, etc.). ⑶ media piled on the pressure loss of the dust layer. 6, the operating pressure operating pressure baghouse is based on static pressure fan filter unit and its installation position before and after the set, but also the design of bag filter pressure value. 7, filtration rate filtration rate is an important factor in the design and selection of bag filter, which is defined as filtered air through the filter of speed, or air flow through the filter and the filter area ratio. Units with m / min to represent. Bag filter filtration area is determined, then the process would depend on the size of the wind speed filter selected, the formula is: Q = v × s × 60 (m3 / h) Where: Q - Flow rate v - filtration velocity ( m / min) s - total filtration area (m2) stated: Filter area (m2) = air volume (m3 / h) / (filtration rate (m / min) x60) baghouse filtration rate hairy filtration rate and net filtration rate of the points, so-called gross filtration rate refers to the process air bag filter divided by the total filter area, while net filtration rate refers to the process air flow divided by net bag filter filter area. In order to improve the cleaning effect and the ability to operate continuously in the bag filter design will be divided into several chambers (or district), each room has a master valve to control the chamber filter in filter state or stop state (online or offline). When a chamber cleaning or maintenance, it is necessary to close the main valve and filter in stop state (offline), then air volume completely by other chambers burden, other rooms total filtration area called net filter area. In other words, the net filtration area equal to the total filter area filter area minus the sum necessary to maintain the operation of the cleaning and maintenance rooms Number. 8, bag filter bags aspect ratio aspect ratio is the ratio of the length and diameter of the bag. The aspect ratio of the bag with the following requirements: anti-hair-style mechanical shaker -30 to 40 -15 to 35 pulse-type -18 to 23 new vacuum cleaning bag filter dust, air pollution control industrial boilers. Practice shows that the bag filter has a low investment, small footprint, large filtration area, stable performance, clean and efficient, reliable, easy to recycle the dry dust utilization, effective protection of the environment, is a good performance , to meet the requirements of current environmental law, reliable and efficient dust removal device. In order to effectively control the boiler exhaust gas pollution, the plant comprehensive study tour bag dust removal technology, based on the combination of the characteristics of fast loading horizontal chain grate boiler operation, and according to production requirements and site conditions, because the furnace system should be designed and negative cleaning bag filter, the filter is located in the boiler drawing fan negative pressure zone, the use of vacuum suction fan system consisting of dust, the use of alkaline glass fiber filter to resist corrosion SO2 in the flue gas. (1) boiler flue gas emissions 12000m3 / h ~ 14000m3 / h. (2) After the boiler flue gas economizer and heat pipe exchangers exchange levels, flue gas temperature is controlled at 140 ℃ ~ 170 ℃. (3) dust emission concentration <200mg / m3, blackness