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SCR Urea Ammonia gas denitrification process in the application of engineering


, 2.5x10m hydrogen yield (kh) 20 【) 2OO20O ball element consumption (kh) 37037O370 urinary quality of the I1, 『Cashmere, IIJ tunnel Chong small I: 0.5% T, № grade, formaldehyde with small ro】 5 Po % agriculture, consumption of desalted water level profit (『T1 / h) O. 40.4 (J chu move when the meter system) 1 Power consumption (kW) 7878680 Yak amount of steam (t / h) l10.5 plant with the amount of compressed air (UT 』rrRA1. Yi Chuan atomization, OO7-2Nryl/Illiii13 .2 application of urea ammonia process should pay attention to the problem 1) by hydrolysis of the ammonia demand signal system to slower response times,[link widoczny dla zalogowanych], so urea hydrolysis reactor should be located near the denitrification reactor Department. 2) foreign projects more than one boiler units share a case of the hydrolysis reactor, the author suggested that such programs need to consider carefully. Hydrolysis reactor,[link widoczny dla zalogowanych], the minimum allowable load for 10% of its maximum load, when more than one boiler units shared a hydrolysis reactor, if the operation occurred and only 1 set oven to low loading conditions, the hydrolysis reactor may be run at this time the load below its minimum allowable load. Caused by denitrification system can not function. 3) high energy pyrolysis system for economic energy saving, heat boiler can be a dilution air, and then use electric heaters to heat the air is heated to the specified temperature. Thus, the amount of dilution is small (typically less than 1% of the amount of primary air), had no effect on the boiler, and take advantage of a wind energy,[link widoczny dla zalogowanych], reduce energy consumption. 4) All access to the urea solution in the container, the pump impeller and casing, pipes, valves and other materials, should consider the urea solution (on the next page 51) 6.6oC (oVERCURRENT) Fault means: over-current. Analysis: Over-current is the daily operation of the drive door alarm the most frequent phenomenon, often appear in the start and the motor increases the speed the process. 1) The inverter output side of a short circuit, grounding. 2) The load is too large, reduce the load or lengthening the acceleration time. Approach: 1) short-circuit fault, the phenomenon is generally a trip on the CLP increases the speed can not be reset or 一 Jiu trip, check the motor or drive to the existence of the line between the motor ground or short white phenomenon, and try to be ruled out. 2) The dramatic changes caused by external load over-current, to check whether the transmission mechanism jammed, the motor and gear box and other institutions with or without abnormal vibration, noise, shock and heat phenomena, and immediately removed. 3) The inverter setup or operating over-current causes, the actual operation of the device, set a reasonable drive increases the speed and deceleration time, current limit and to the ~ I # I-compensation and other relevant parameters, and to ask door drivers to operate smoothly and minimize acute Kai, emergency stop operation. I I55 Chinese Special Equipment Security corrosive liquid, should be made of stainless steel, the reaction of ammonia outlet pipe also made of stainless steel. 4 Conclusion urea ammonia process because of its superior security, in the SCR DeNOx project has been widely appreciated. Different characteristics of each of urea ammonia process, the user can choose according to their own situation. From running costs, the lowest for the liquid ammonia system,[link widoczny dla zalogowanych], the urea hydrolysis system slightly higher, the highest urea pyrolysis system. From the investment costs, the minimum system for liquid ammonia, urea process above the more. Pyrolysis system which was slightly lower than the hydrolysis system (because some of its equipment in the domestic manufacturing, and reduce the cost.) If we can reduce the cost, urea ammonia process (especially hydrolysis system) in terms of thermal power plant is still a very attractive option. (Closed: draft port of 2009-08-24) 6.70V (oVERVoLIAGE) failure meaning: the main circuit Overvoltage Analysis: Over-voltage power supply or operate primarily by such external factors. 1) over-voltage power supply voltage is too high because leaving the DC bus voltage exceeds the rated value, frequency system trip to the police. As the door machine is powered directly from the terminal substation to be required to improve quality of power supply substation to reduce voltage fluctuations, if necessary, increase the power transformer on the capacitance to ensure the quality of power supply. 2) Regeneration overvoltage. Door in the course of sometimes drive the phenomenon of over-voltage trip,[link widoczny dla zalogowanych], easy to stop the process in, 25t, 40t of the door by way of dynamic braking in the braking process, the motor slip is negative, Motor power is actually in the state, the energy produced can only be consumed by the brake resistor. If the drive motor deceleration time is too short or affected by external force, resulting in energy consumption was too late, it will have over-voltage. Treatment: general return to normal after a reset. If not solve, the inverter can be used to extend the method to solve the deceleration time, requiring the driver door smooth operation and reduce sudden stop and You hook and other operations. (Received 2009-08-31)
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