Automatic adjustment system and method for water inlet flow rate of condenser cooling pipe

Abstract

The invention relates to an automatic adjusting system and method for the water inflow flow speed of condenser cooling pipes. The automatic adjusting system for the water inflow flow speed of the condenser cooling pipes comprises a condenser assembly, an adjusting assembly and a control device. The condenser assembly comprises a condenser shell, the multiple cooling pipes and a pipe plate. The condenser shell is provided with a water inlet chamber. The adjusting assembly comprises partition plates and a baffle capable of rotating by itself. The partition plates are arranged in the water inlet chamber and include the first partition plate and the second partition plate which are fixed to the outer side of the pipe plate in a spaced manner. The baffle is arranged between the first partition plate and the second partition plate and provided with a first matching part and a second matching part which are symmetrically arranged. The control device comprises a power mechanism. The output end of the power mechanism is fixedly connected with the baffle. The control device controls rotation of the baffle through the power mechanism. According to the automatic adjusting system and method for the water inflow flow speed of the condenser cooling pipes, the heat exchange efficiency of the condenser and equipment running safety can be improved.

Description

technical field [0001] The invention relates to the technical field of condensers, in particular to an automatic adjustment system and method for the water inlet flow rate of a condenser cooling pipe. Background technique [0002] Water-cooled surface condensers are widely used in thermal power plants and nuclear power plants. They are mainly used in steam turbine power plants. They are an important part of steam turbine devices in power plants. . The exhaust steam of the steam turbine enters the condenser shell through the throat, condenses into water on the cooling pipe and collects it in the hot well, and is pumped out by the condensed water pump and sent back to the boiler for circulation. Circulating cooling water enters the cooling pipe from the inlet water chamber and discharges from the outlet water chamber. The main function of the condenser is to create a relatively high vacuum at the steam exhaust port of the steam turbine, so that the steam expands to the lowes...

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Problems solved by technology

[0003] Existing condensers cannot be adjusted according to changes in working conditions, resulting in high subcooling of condensed water under low load and winter (cooling water temperature is low) working conditions, relatively low thermal efficiency of the steam turbine cycle, and condensed water containing The amount of oxygen increases, which has the following disadvantages:

[0005] (1) The cooling area of ​​the condenser is designed according to the TMCR working condition of the steam turbine. In order to pursue the lower back pressure under the design working condition, the heat exchange area is generally too large. When the load is low and the cooling water flow rate is small, part of the heat exchange The area is not only ineffective, but also reduces the heat transfer effect of the condenser. The low flow rate in the cooling tube is easy to cause impurities to deposit, and the cooling water in the upper cooling tube is less, which will cause "dry burning" phenomenon

[0006] (2) The condenser has no moving parts in the structural design and cannot be adjusted according to changes in working conditions, resulting in high supercooling of condensed water under low load or winter (lower cooling water temperature) working conditions, and the steam turbine cycle The thermal efficiency is relatively reduced, and as the subcooling degree of the condensed water increases, the oxygen content in the condensed water increases, which will cause corrosion of the condenser, which is not conducive to the safe operation of the equipment, and at the same time increases the burden on the deaerator

For any well-designed steam turbine and its condenser, when the load of the unit is reduced to below 30-40% and the cooling water temperature is low, the condenser is likely to reach the ultimate vacuum, which will cause the last stage blade of the steam turbine to appear in a blast condition, not only It will affect the safety of the unit, and it will reduce the power of the unit and increase the supercooling degree of condensed water, which will affect the economy

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