Circulating water system control method

A circulating water system and control method technology, applied in the direction of electrical program control, sequence/logic controller program control, neutralized water/sewage treatment, etc., can solve the problem of inability to effectively control the safe and stable operation of the circulating water system and affect Problems such as ion determination, concentration ratio, and concentration ratio are not accurate enough to achieve the effect of ensuring safe and economical operation, ensuring safe and stable operation, and good economic and social benefits

Active Publication Date: 2012-09-19
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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AI Technical Summary

Problems solved by technology

The composition of these waters is complex, and the flow rate and water quality change with time and seasons. In particular, the ratio of chloride ions to various ions varies greatly. It is not accurate enough to judge the concentration ratio only by detecting the content of chloride ions in circulating water.
In addition, the growth of bacteria and algae brings troubles to the system. The circulating water system of thermal power plants must regularly add a certain amount of fungicides for sterilization and algae treatment. Commonly used effective oxidizing fungicides are mainly chlorine-based fungicides, and chlorine-based fungicides ( Especially sodium hypochlorite) brings a large amount of chloride ions into the circulating water system, which affects the determination of chloride ions and the calculation of concentration ratio
Therefore, the method of monitoring the concentration ratio of chloride ions alone cannot effectively control the safe and stable operation of the circulating water system. It is expected to have a reasonable control method for the circulating water system

Method used

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Effect test

Embodiment 1

[0032] Due to the need of water saving, the water source of the circulating water system of a power plant was changed from surface water to urban reclaimed water. Because the reclaimed water quality fluctuated greatly with time, the determination of chloride ions was unstable and it was difficult to calculate the concentration ratio. Use the circulating water system control method of the present invention to detect and control the circulating water. Under the condition of adding scale and corrosion inhibitor 6mg / L, carry out the scale inhibition test according to step (1) to obtain the concentration multiple. Carry out step ⑵, according to △A=0.18, get the limit value of concentration multiple, alkalinity limit value and hardness limit value, the results are shown in Table 1. The control index of alkalinity and hardness is obtained by multiplying the limit value of concentration ratio, alkalinity and hardness by a safety factor of 0.9, as shown in Table 2. In the past 3 years ...

Embodiment 2

[0038]A power plant uses mine water as supplementary water and sodium hypochlorite as bactericide for sterilizing treatment. When it is controlled by the concentration ratio, the fluctuation of the detected value of chloride ion is large, which is difficult to control. Using the circulating water system control method of the present invention to detect and control the circulating water, the limit value of the concentration multiple, the limit value of alkalinity and the limit value of hardness are obtained, as shown in Table 3. The control index of alkalinity and hardness is obtained by multiplying the limit value of concentration ratio, alkalinity and hardness by a safety factor of 0.9, as shown in Table 4. After more than one year of operation, the circulating water system has been checked to be clean, free from hard scale deposits, and the scale inhibition effect is good. The control method is clear, easy to detect and implement, and has been well received by the operation ...

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Abstract

The invention relates to a circulating water system control method, which comprises the steps of (1) acquiring a limit concentration ratio in circulating water through a scale inhibition test; (2) determining a limit value of chloride ion concentration ratio, a hardness limit value and an alkalinity limit value of the circulating water at the limit concentration ratio; (3) creating a safe chloride ion concentration ratio for the running control of the circulating water, and determining a control index of the alkalinity and the hardness; (4) detecting the alkalinity and the hardness of the circulating water; (5) observing whether the detection value of the alkalinity and the detection value of the hardness of the circulating water meet the control indexes, and processing the circulating water and re-detecting the circulating water after being adjusted if one or two items of the detection value of the alkalinity or the detection value of the hardness cannot meet the control index; and (6) ending the detection if both the detection value of the alkalinity and the detection value of the hardness meet the control index. The method for detecting and controlling the alkalinity and hardness in the circulating water is used for substituting the method for controlling the concentration ratio so as to prevent the scaling and corrosion problems of the circulating water, so that not only is the running of the circulating water convenient to control, but also the water resource is maximally utilized.

Description

technical field [0001] The invention belongs to the technical field of circulating water management, and relates to a control method for a circulating water system, in particular to a control method for scale and corrosion inhibition treatment of an industrial circulating cooling water system. Background technique [0002] Water is a necessary condition for the survival of all living things, and water saving is imperative. Circulating water system is the most important cooling system of industrial enterprises. Whether the circulating water system can operate normally will directly affect the stable operation, production safety and economic benefits of the enterprise. The water consumption of the circulating water system of the dry ash removal thermal power plant accounts for more than 70% of the total water consumption of the power plant. With the increasing shortage of water resources and the stricter national environmental protection policies, the monitoring and control of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04C02F5/08C02F1/66
Inventor 王平任汉涛周慧波刘朝辉刘强
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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