Dosing control method of phosphate in middle-low pressure boiler
A control method, low-pressure boiler technology, applied in complex/solubilizer treatment, material resistance, etc., can solve problems such as few applications, difficult time tracking, and changes in phosphate content
Active Publication Date: 2013-07-17
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0006] However, because the above method is limited by the analysis time and frequency, it is difficult to ensure that the dosing amount meets the regulations around the clock
[0007] Because, among the two methods mentioned above, the first method is more accurate in analysis accuracy, but because the operating conditions of the unit will change at any time, such as changes in water supply; changes in steam drum blowdown; heating start and stop; power generation load fluctuations; Changes in the concentration of the medicine box during dispensing; both will cause a large change in the phosphate content in the system
On the other hand, it is obviously difficult to achieve time tracking by adjusting the dosing amount after manual analysis in the laboratory.
[0008] In addition, the second method is generally less used because it requires capital and maintenance personnel investment, and the analysis of the online instrument also takes 8 minutes.
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[0044] Hereinafter, the present invention will be specifically described by way of examples.
[0045] First of all, explain: Generally, there are two types of dosing pumps. One is the switch pump, that is, it is fully opened or fully closed after receiving the command. The dosing metering per unit time is unchanged, and the amount of dosing in the system depends entirely on the on or off command. The other is the variable frequency pump, that is, it changes the dosing amount by changing the frequency of the motor, and the frequency of the motor is issued by the command. The frequency conversion output frequency is generally 0-50Hz, and the corresponding opening is (N%) 0- 100%
[0046] For example, the phosphate dosing pump control program:
[0047] When the conductivity of the boiler water is <20.5 or the pH of the boiler water is <8.5, start the pump or increase the frequency (N%=(1-DD / K)×100%k=29.7).
[0048] When the conductivity of the boiler water is >29.7 or the pH o...
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The invention provides a dosing control method of phosphate in a middle-low pressure boiler. The dosing control method of phosphate in the middle-low pressure boiler is especially suitable for water quality monitoring of a middle-low pressure waste heat type boiler, wherein the steam pressure at the boiler outlet of the boiler is below 6.0 MPa; and the method can be used for controlling the automatic dosing amount of phosphate according to an electrical conductivity value. According to the dosing control method of phosphate in the middle-low pressure boiler, the adding amount of phosphate meets the requirement under any condition.
Description
technical field [0001] The present invention relates to the field of water quality monitoring for medium and low pressure boilers. Specifically, the present invention relates to a phosphate dosing control method for medium and low pressure boilers. Water quality monitoring for medium and low pressure waste heat boilers below 6.0 MPa, and the automatic dosing of phosphate can be controlled according to the conductivity value. Background technique [0002] In the boiler water treatment process, phosphate dosing is the most common treatment method. Phosphates prevent scaling and corrosion in drum boilers. However, the content of phosphate in the drum boiler needs to be clearly regulated, and the addition of too much or too little will increase scaling and corrosion. At present, the phosphate content is still judged by sampling analysis or online phosphate analyzer, and then the dosing amount is adjusted according to the phosphate content. [0003] The prior art generally has...
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IPC IPC(8): G01N27/06C02F5/08
Inventor 刘仕君赵鸿萍余国平田昇斌陈文斌蔡新祥徐光洪
Owner BAOSHAN IRON & STEEL CO LTD