A method and system for on-line chemical cleaning and liquid preparation of condensers in power plants

Abstract

The invention discloses a power plant condenser online chemical cleaning liquid preparing method and system. The method comprises the steps that 1, chemicals are put into a tank I; 2, the system is started; 3, water is supplied for liquid preparation; 4, a robot is started; 5, a cleaning mode I of a condenser is started; 6, a cleaning mode II of the condenser is started; 7, a heat exchange pipe inthe condenser is cleaned; 8, residual liquid is treated. The system comprises the tank I and a tank II, the tank I is provided with a liquid level I and an acid concentration meter I, and the tank IIis provided with a liquid level II and an acid concentration meter II; the tank I is connected with a valve IV and a valve VII through pipelines respectively; the valve IV is connected with a water pump, a valve II and a valve III through pipelines respectively; the valve VII is connected with the water pump, a valve I and a valve VIII through pipelines respectively; the valve VIII and the valveVIII are connected with the tank II through pipelines, the valve II is connected with the valve I through a pipeline, and the valve I is connected with the robot. The method and system are high in automation degree, good in descaling effect and capable of realizing zero emission.

Description

technical field [0001] The invention belongs to the field of chemical cleaning of industrial heat exchangers, and in particular relates to a method and system for on-line chemical cleaning of condensers in power plants. Background technique [0002] The condenser of the power plant is composed of thousands of heat exchange tubes, steam flows outside the tubes, and cooling water flows inside the tubes. Due to the existence of heat exchange, the salt in the cooling water is continuously precipitated during the continuous heating process, forming a large amount of scale and adhering to the On the tube wall, the vacuum in the condenser will drop, the coal consumption rate of power generation will increase, and the cost of power generation will increase, thus reducing the efficiency of the turbogenerator set. When the scale of the condenser is about 0.5mm, the vacuum can be reduced by 90% to 85%, and the coal consumption of power generation can be increased by 15 to 20g / kW·h. For...

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Problems solved by technology

[0006] The main problem of this cleaning method is: the added chemical cleaning agent is diluted by a large amount of circulating water in the circulating water pool, and it is far from reaching the cleaning concentration when it reaches the heat exchange tube of the condenser, and a large amount of chemical cleaning agent is wasted.

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