: With the continuous expansion of the production scale of new dry process cement, how to effectively control the emissions of new dry process kiln soot and dust has become the focus of environmental protection departments. According to the progress of dust removal technology, GB4915-2013 standard will PM (particulate matter) emission limit from 50mg / Nm3 (cement kilns and other thermal equipment) received strict to 30mg / Nm3. Our 2500t / d production line is equipped with Φ4m × 60m rotary kiln, TDF calciner, TL-1164 grate cooler and Φ4.6m × (10 + 3.5) m raw material for drying. Before 2014, kiln head and kiln tail dust collection system adopts the electric dust removal method, and the dust collection effect basically meets the environmental protection requirements during normal production. However, when the stopping or raw material mill shutdown occurs, the dust discharge concentration Increase the phenomenon; when the grate cooler clinker poor or working conditions fluctuations, kiln head chimney dust emission concentration will increase the phenomenon, affecting the environment. In the second half of 2014, the company organized the transformation of the original electric dust removal system. After a comprehensive analysis, the electric precipitator of the kiln head was changed into a composite bag filter of electric bag, the electric precipitator of the kiln tail was changed into a bag dust collector, December 14, 2014 downtime on the kiln, kiln ESP to transform, in January 12, 2015 transformation completed and put into use. This article focuses on the acceptance of the precipitator after the transformation and the preparation before feeding as well as the adjustment of the production in the later period. 1 dust collection system after the work of acceptance considerations 1) kiln dust collection system after the completion of the transformation must be acceptance. After the kiln exhaust fan starts, the screw conveyer under the electric bag compound dust remover is turned on. Through the pull of the wind, the electrode tip, the small scrap iron blocks and some debris existing inside are discharged to the screw conveyor by drawing the wind , Or start the feed after the impact of equipment operation. 2) Kiln bag filter internal inspection and acceptance is particularly important, my workshop due to lack of experience, acceptance is not complete, leading to the bottom of the original electrostatic precipitator boot machine frequently jumps in the boot process. Before construction, it should be required that there be no construction waste inside the construction side. Dust recovery is completed, the kiln exhaust fan with operating conditions, the wind for a long time, open the kiln equipment, hanging stick in the precipitator debris settled down, discharge. This process takes a long time, pay attention to the current changes of the screw conveyor and zipper. ①sealed work. Acceptance of the sealing work to strict requirements, the dust collection system is running, the oxygen content is a very important test parameters, high oxygen content, the value of the converted nitrogen oxides will increase, ammonia consumption will increase, thus increasing consumption. Therefore, air leakage control is very important. ② insulation work. Because my company is located in the north, cold in winter, outside the precipitator insulation can not exist dead ends, otherwise, during normal operation, likely to cause internal condensation, causing corrosion of the steel structure. In addition, kiln, kiln tail gas tank must be two at the insulation, but also because of the gas tank placed at a high altitude, low temperature, it is best wrapped around the exhaust valve with tropical, to prevent too much water caused by freezing, Affect the filter bag cleaning. The two oil-water separators in front of the precipitator must also be well insulated to prevent freezing, and the oil-water separator is not drained in time, and ice cubes will be generated, affecting dust collection and dust collection. ③ filter bag installation process, the workshop set up personal monitoring. 2 pre-production preparations 1) To ensure that the pressure, temperature detection point value is accurate, especially the inlet temperature of the precipitator. 2) kiln, kiln tail test machine in advance, linkage operation. 3) factory training must be done well in advance, workshop operators and the corresponding management staff to participate. Electrical and automation part of the training should be done well in advance, to ensure that the appropriate personnel in the event of problems will operate, adjust. Training materials should have electronic version and instruction manual two, at the same time on-site training should also be done, mainly for workshop managers and section manager corresponding length. 4) Before heating, the blowing process of high-temperature fan will inevitably cause the inlet temperature of kiln bag filter to increase. Under the condition of preheater production permit, it is possible to reduce the number of high-temperature fan rotation properly, Under the premise of positive pressure, appropriate to reduce kiln exhaust fan speed or valve opening. In order to control the temperature, through practice, raw mill exhaust fan can be opened in advance, unloading warehouse inspection door open, grinding head, grinding tail cold air valve opens, you can reduce the inlet temperature of the kiln bag filter to a large extent. 5) check the humidification tower water conditions and pump work in advance, the atomization effect is better. It is best to feed, the humidifier above someone to make adjustments. 6) Under the humidifying tower screw conveyor to play "reverse", humidifier tower collected waste discharge, to be normal after production, hit "forward" to return to normal delivery. 7) In consultation with the constructor, install the cold air valve in the proper place in front of the kiln dust remover to control the switch in the central control room. In case of emergency, cold air inlet can be adopted to reduce the inlet temperature. 8) before feeding, the control room and the scene to confirm whether the emergency cold air valve switch is in line with the actual, do not appear in the control has been opened, but the scene valve does not move the phenomenon occurred. 9) Control valve electric actuator to do the work of rain. 3 production process adjustment 1) During normal production, strictly execute the operating instructions (temperature and pressure control according to the operating instructions) to ensure that the inlet temperature and pressure differential of the precipitator meet the requirements of the equipment, and take measures in time if there is any fault. 2) For kiln head and kiln tail gas, two gas cylinders on duty should be inspected as main equipment to eliminate water vapor in each class in time to prevent freezing (low winter ambient temperature in the north); if possible, electronically charged Drain, after installation, you can omit the manual drainage procedures; two tank pressure must be connected to the control operation screen, in order to be able to monitor the first compressed air is abnormal. 3) In the event of a "gas bag pressure" alarm on the precipitator, indicating that the amount of compressed air required for backflushing is insufficient, you must immediately find out the specific cause, restore compressed air pressure and resolve as soon as possible. Otherwise, the pressure is low, the dust adsorbed on the filter bag can not blow back, the pressure increases, resulting in inadequate ventilation system, a positive pressure, and will affect the life of the filter bag, especially the kiln bag filter. 4) After feeding, AQC furnace and PH furnace with waste heat power generation must be operated with kilns. AQC furnace and PH furnace are forbidden to be reflowed during kiln operation. If AQC furnace or PH furnace fails to be reflowed, it is required to inform burning workshop in advance Operators to ensure the duration of the furnace, the operator according to the circumstances in accordance with the program to stop material, and then to the workshop management to report the situation, to ensure kiln, kiln dust filter bag safety, prevent waste heat power generation boiler retreat, bag filter inlet Temperature rises, the situation appears burners. 4 to develop kiln bag dust collector safety operation contingency plan Through the kiln head and kiln electric precipitator retrofit operation practice, kiln tail bag filter inlet temperature is relatively stable, better control of the kiln head electric bag compound precipitator inlet temperature changes, difficult to control, in order to further protect the kiln Dust filter bag, the company's technology center organization, control room and workshop to complete its safety operation contingency plans. 4.1 improve the monitoring and control hardware facilities 1) into the bag filter temperature increased by a temperature measurement point, the two temperature values ​​at the same time, select the high participation in chain control. 2) In front of the kiln cold air valve plus a temperature measurement point for temperature control reference in advance. 3) kiln waste heat boiler inlet temperature monitoring into the firing control system. 4) kiln pneumatic cold air valve to achieve the operation of central control functions. In addition to the chain, the control can also be opened and closed, adjust the temperature flexible. 5) Improve the original cold air valve, the control can be adjusted instantly. 6) The baghouse's by-pass valve control can be monitored on or off. 7) compressed air bag filter used to install pressure gauge and pressure switch, the control screen to view the pressure and pressure switch status, and set the alarm range, the pressure monitoring point near the pneumatic valve. 8) Led by the workshop, the accuracy of the parameters of the kiln and power generation system is further confirmed. The alarm range of the parameters is re-approved and adjusted by the control room. 9) Sound kiln parameter curve: three temperature at inlet of precipitator, one temperature at outlet, one temperature at inlet of waste heat boiler, negative pressure at kiln head, negative pressure at outlet of waste heat boiler or inlet of precipitator and negative pressure at outlet of precipitator, Plus cold air valve status, the status of the bypass valve and the waste heat boiler bypass valve. 4. 2 routine maintenance 1) The control room to check once a week dust collector inlet temperature measuring point, pressure measuring point and compressed air pressure measuring point intact, timely proofreading temperature accuracy, promptly determine whether there is abnormal pressure testing.
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