Cooling tower scale-inhibition testing apparatus control system of direct-current valve cooling system

Abstract

The invention provides a cooling tower scale-inhibition testing apparatus control system of a direct-current valve cooling system. The control system is composed of a programmable logic controller (PLC), a digital quantity input module, a digital quantity output module, an analog quantity input module, an analog quantity output module, an acquisition measuring system, a man-machine interface, and a power supply system. With the system, electromechanical equipment controlling, signal acquisition, data on-line monitoring, fault determination and uploading can be realized; high-stability, high-performance, and high-reliability automatic operation of all electromechanical equipment according to a predetermined logic can be coordinated; real-time signal acquisition like the flow, the pressure, the temperature and the conductivity and the like can be carried out and the signals are uploaded to an upper computer to carry out data archiving; and when one parameter extends the set range, alarming is carried out, so that the tester can be prompted to carry out fault processing timely.

Description

technical field [0001] The invention relates to a cooling system for a direct current transmission converter valve, in particular to a control system for a cooling tower antiscaling test device. Background technique [0002] The cooling system of HVDC converter valves is generally divided into internal cooling water circulation system and external cooling circulation system. After the internal cooling water completes the heat exchange with the heating element, it enters the external cooling circulation system to exchange heat with the external cooling medium, and after cooling, it is pressurized by the circulating pump and enters the main water pipeline. According to the different environmental conditions used, the outdoor heat exchange equipment used in the DC valve cooling system is also different. In view of the current situation in China, the ambient temperature in the south is high, but the water source is sufficient, and the cooling tower is mainly used as the heat exc...

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Problems solved by technology

[0003] Since the existing DC valve cooling system does not carry out advanced treatment on the spray water, it only simply adopts auxiliary measures such as regular dosing, continuous water discarding, and water replenishment to alleviate the formation of scale, which cannot effectively reduce the calcium and magnesium plasma in the spray water. Calcium, magnesium and other bicarbonates in the water are rapidly concentrated and crystallized to form scale, which adheres to the outer surface of the heat exchange coil of the cooling tower, seriously hindering the effective heat exchange of the heat exchange coil of the cooling tower, resulting in a decrease in the heat exchange capacity of the DC valve cooling system , the temperature of the cooling water inlet valve rises, the heat exchange redundancy of the cooling tower decreases, and it may even lead to insufficient heat dissipation capacity

However, regular dosing of spray water is likely to cause pollution to the environment, and the operation workload is heavy, and the frequency of dosing is difficult to control, which is not conducive to environmental protection.

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