Water filling device and method for subcritical and above pressure boiler

Abstract

The invention discloses a water filling device and method for a subcritical and above pressure boiler. The water filling device is sequentially connected with a demineralized water supplement tank, a condensed water supplement pump, a water filling pipeline, a three-stage high-pressure heater and a coal economizer, wherein a medicine feeding device used for sampling and feeding a treatment medicine to the demineralized water in the pipeline is arranged on the water filling pipeline. The method comprises the following steps: firstly placing the demineralized water into the demineralized water supplement tank, and pumping the demineralized water in the demineralized water supplement tank by the condensed water supplement pump into the subcritical and above pressure boiler via the filling pipeline, the three-stage high-pressure heater and the coal economizer that are sequentially connected; then during the process of filling water into the subcritical and above pressure boiler, adjusting the water quality parameters of the demineralized water in the pipeline by adopting the method of sampling and feeding the treatment medicine by the medicine feeding device. The device and the method are simple, the water pump motor is a normal motor with low voltage of 380V and low power of 90KW, the use of a high pressure electric water feed pump is avoided, the operation is simplified, the electric consumption is less, the impact to the system is small, and the service life of high pressure large power equipment is not affected.

Description

technical field [0001] The invention relates to a subcritical and above-pressure boiler matching device and an operating method in a thermal power plant, in particular to a water-filling device and method for a subcritical and above-pressure boiler in a thermal power plant. Background technique [0002] In thermal power plants, the boilers matched with 300MW and above turbogenerators are subcritical and above pressure boilers. The water used in these boilers is desalted water after complex and strict process treatment. The cost of desalinated water is very high. The boiler heats the desalinated water into high-pressure steam, and the output high-pressure steam pushes the turbogenerator unit to generate power, and then condenses into condensed water in the condenser, and then sends the condensed water back to the boiler through the boiler water supply device, so that the condensed water can be recycled. Due to the high pressure of the boiler, the boiler water supply device is...

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Problems solved by technology

When the hydraulic test is carried out on subcritical and above pressure boilers and devices, the above-mentioned temporary water-filling device is used to fill the sequentially connected three-stage high-pressure heater, economizer and boiler with water. After the hydraulic test is completed, the above-mentioned temporary water-filling device The condensate replenishment pump and the desalinated water replenishment water tank are used to replenish the reduced condensate to the boiler, and the water filling pipe of the temporary water filling device is idle and useless. There is no dosing device in the water pipeline to adjust the water quality parameters of the condensed water in the pipeline by sampling and adding treatment chemicals. The temporary water filling device cannot be used as a water filling device for subcritical and above pressure boilers before performing hydraulic tests or starting ignition.

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