On-line ultrasound rotational flow descaling device for condenser

Abstract

The invention discloses an on-line ultrasound rotational flow descaling device for a condenser. The on-line ultrasound rotational flow descaling device is mainly formed by ultrasonic wave descaling equipment, a display operating system, a data acquisition and control device and power supply control equipment, wherein the display operating system is connected to the data acquisition and control device through a RS485bus, the data acquisition and control device is respectively connected to the ultrasonic wave descaling equipment, the rotational flow descaling device, the power supply control equipment and the condenser; the ultrasonic wave descaling equipment is fixed on the condenser, the on-line ultrasound rotational flow descaling device also comprises a rotational flow descaling device, the rotational flow descaling device is fixed on the condenser and is connected to the power supply control equipment through a circuit, hard scale of a pipe wall of the condenser can be cleared by the condenser through ultrasonic waves sent by the ultrasonic wave descaling equipment, meanwhile, soft scale of the pipe wall of the condenser can be cleared by the condenser through rotational flow generated by the rotational flow descaling device, therefore, the hard scale and the soft scale of the condenser can be cleared on line through two kinds of physical methods can be achieved.

Description

technical field [0001] The invention relates to the technical field of scale treatment, in particular to an online ultrasonic swirl descaling device for condensers used for removing scales on heat exchange surfaces of condensers. Background technique [0002] The condenser is an important part of the steam turbine unit. Its function is to cool and condense the exhaust steam of the steam turbine into water to form a high vacuum, so that the steam entering the steam turbine can expand to far below the atmospheric pressure and do more work. [0003] The working performance of the condenser directly affects the safety and economy of the whole unit. Condenser vacuum is the main index to characterize the working characteristics of the condenser, and one of the main factors affecting the safe and economical operation of the steam turbine unit. [0004] The factors affecting the vacuum of the condenser are more complicated, including the heat transfer characteristics of the condens...

AI Technical Summary

Problems solved by technology

[0011] 2. The danger of dirt

The laminar boundary layer is a layer attached to the pipe wall, and the flow rate is very slow. CaCO3 and other dirt in the water are most likely to stay on the inner wall of the pipe to form dirt; moreover, although the laminar boundary layer is very thin, it is close to the pipe wall and heat The resistance is very large, which affects the heat transfer effect

[0013] 2.2 Increase the temperature of the exhaust steam: The thermal conductivity of the dirt is very small, which greatly increases the heat transfer resistance, resulting in a decrease in the heat transfer coefficient, making the circulating cooling water poor in heat absorption, slowing down the condensation speed of the exhaust steam, and causing the exhaust pressure to increase. rise, exhaust temperature rise

[0015] 2.4 Reduce the economic benefits of the steam turbine unit: the reduction of the vacuum reduces the effective enthalpy drop of the steam, which will affect the economical efficiency of the steam turbine unit operation

The general operating experience of power station condensers shows that: every time the vacuum of the condenser decreases by 1kPa, the steam consumption of the steam turbine will increase by 1.5% to 2.5%;

[0016] 2.5 Threat to the safe operation of the unit: If the vacuum is too low, the temperature of the low-pressure cylinder and the exhaust cylinder will increase, causing the center of the steam turbine bearing to shift, and in severe cases, the vibration of the steam turbine unit will increase; when the vacuum is reduced, in order to ensure that the output of the unit remains unchanged , the steam flow must be increased, resulting in an increase in the axial thrust, overloading the thrust bearing, and affecting the safe operation of the steam turbine unit

With the progress of the times and the development of science and technology, various descaling methods emerge in an endless stream. In a certain historical stage, some problems of descaling of condensers have been solved, but there is still a certain gap from the requirements of electric power enterprises.

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