Automatic control method for boiler water ammonification
A boiler water and ammonia liquid technology, applied in the field of boiler water ammonia addition control, can solve the problems of lagging dosing pump, endangering the safe operation of the unit, and large fluctuations in system pH, etc., and achieves the effect of stable control
Active Publication Date: 2021-04-23
江苏南通发电有限公司
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Problems solved by technology
[0002] When the coal-fired thermal power generation unit is running, it is necessary to add ammonia to the boiler water to control the pH of the water to be alkaline. The traditional operation method generally adjusts the dosing amount by manually adjusting the frequency of the ammonia pump according to the change of pH. When the load of the unit fluctuates, the condensate flow The corresponding change, but the change of pH has a certain hysteresis relative to the change of flow rate, which causes the manual adjustment of the dosing pump by the operator to lag behind the change of load, and there is also a certain hysteresis when the pH change is reflected after the adjustment of dosing, which eventually leads to the system pH High volatility
Especially when the load rises quickly, the pH drops too fast. If the pH cannot be raised in time, the corrosion of the steam-water system may be accelerated, which will endanger the safe operation of the unit.
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[0017] An automatic control method for adding ammonia to boiler water, comprising the following steps:
[0018] (1) The adjustment of the output of the dosing pump is realized by adjusting the stroke locally and adjusting the frequency remotely; during normal operation, the local stroke of the ammonia dosing pump is determined through tests according to the concentration of the ammonia liquid and the pH value to be achieved, and the pump passes through the front of the plate. Adjust the frequency of the dosing pump to achieve pH control; when the positive conductance of the feed water is <0.1μS / cm, the pH is converted using the specific conductance SC, that is, pH=8.56+lgSC, because the accuracy of the conductivity meter in pure water is much higher than that of the pH meter, so The purpose of controlling the pH of the feed water is achieved by controlling the specific conductance of the deaerator inlet;
[0019] (2) In order to determine the reference curve of the frequency f...
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The invention discloses an automatic control method for boiler water ammonification. Output adjustment of a dosing pump is achieved in two modes, namely, on-site stroke adjustment and remote frequency adjustment. A linear curve of the load and the frequency is fitted, a point of the total flow and the frequency of the mixed bed is finally determined, and an intelligent correction coefficient is set on the basis. According to the invention, an appropriate condensed water flow-ammonia adding pump frequency control curve is fitted through experiments, and a correction coefficient is set for solving partial frequency value deviation, so that even if the load fluctuates drastically, the specific conductance can be maintained within a stable range, and the purpose of stably controlling the pH of the steam-water system is achieved.
Description
technical field [0001] The invention relates to a control method for adding ammonia to boiler water. Background technique [0002] When the coal-fired thermal power generation unit is running, it is necessary to add ammonia to the boiler water to control the pH of the water to be alkaline. The traditional operation method generally adjusts the dosing amount by manually adjusting the frequency of the ammonia pump according to the change of pH. When the load of the unit fluctuates, the condensate flow The corresponding change, but the change of pH has a certain hysteresis relative to the change of flow rate, which causes the manual adjustment of the dosing pump by the operator to lag behind the change of load, and there is also a certain hysteresis when the pH change is reflected after the adjustment of dosing, which eventually leads to the system pH Large fluctuations. Especially when the load rises rapidly, the pH drops too fast. If the pH cannot be raised in time, the corr...
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IPC IPC(8): C02F1/66
Inventor 彭晶晶顾辉谢峰施永建瞿林丽陈星梁静珅
Owner 江苏南通发电有限公司