Steam pipe blowing method for ultra-supercritical once-through boiler with no boiler water pump

Abstract

The invention discloses a steam pipe blowing method for an ultra-supercritical once-through boiler with no boiler water pump. The steam pipe blowing method comprises a first stage of trial pipe blowing and purging of attemperation water pipelines and high-pressure bypass pipelines of a superheater and a reheater, a second stage of serial-connection pressure stabilization purging of the superheater, the reheater and a connecting pipeline of the boiler, and a third stage of serial-connection pressure stabilization and reduction purging of the superheater, the reheater and the connecting pipeline of the boiler; and after target practice is qualified, the boiler is shut down for maintenance, and the pipe blowing work is finished. According to the steam pipe blowing method, on one hand, the problems that under the condition that the ultra-supercritical once-through boiler is provided with no boiler water pump, water and heat in the starting stage and the low-load wet running stage are hard to recycle, and water and heat consumption is large can be effectively relieved, and the water and heat consumption in the starting stage and the pipe blowing stage of a unit is greatly reduced; and on the other hand, the beneficial effects of the pressure stabilization pipe blowing method can be given into full play, impacts on a temporary system in the pipe blowing process are greatly reduced, the work period of steam pipe blowing of the boiler is shortened, and it is guaranteed that steam pipe blowing of the ultra-supercritical once-through boiler with no boiler water pump is completed quickly and efficiently in a quality keeping manner.

Description

technical field [0001] The invention relates to a boiler steam blowing method, in particular to a steam blowing method for an ultra-supercritical once-through boiler without a furnace water pump. Background technique [0002] With the high development of the country's industry, the demand for electricity is also increasing and the requirements are getting higher and higher. Therefore, thermal power plants are playing an increasingly important role in the overshoot of the country's high economic development. As one of the most important equipment in a thermal power plant, boilers and their ancillary equipment are updated more and more quickly. The high-parameter, large-capacity ultra-supercritical once-through boiler has become the fastest-growing and most commonly used boiler type in recent years because of its economic advantages of high power generation and low coal consumption. In the past, once-through boilers were equipped with boiler water pumps for boiler startup. Ho...

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Problems solved by technology

In the past, most of the newly-built units used the method of blowing with reduced pressure, but the method of blowing with reduced pressure steam consumes a lot of water, which has a great impact on the temporary system of boiler blowing, and the blowing period is long

[0004] Therefore, in order to solve the problems of difficult water and heat recovery and large water consumption during the start-up stage of the ultra-supercritical boilerless water pump once-through boiler, and ensure the efficient, rapid and high-quality steam blowing of the ultra-supercritical boilerless boiler once-through boiler, this case proposes a Rapid Steam Blowing Method Applicable to Ultra-Supercritical Furnaceless Pumped Once-through Boiler

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