Supercritical boiler flexible peak shaving system and method

A supercritical boiler, flexible technology, applied in the direction of combustion method, steam generation method, boiler cleaning device, etc., can solve the problem of high load in the wet state, increase the temperature at the middle point, increase the steam consumption, and improve the combustion stability Effect

Pending Publication Date: 2021-08-13
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0012] In order to solve the problems existing in the prior art, the object of the present invention is to provide a flexible peak-shaving system and method for supercritical boilers, so as to overcome the problem that the supercritical boilers are operated at ultra-low loads and have higher loads in the wet state

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  • Supercritical boiler flexible peak shaving system and method

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Embodiment

[0047] The flexible peak-shaving system of the supercritical boiler in this embodiment includes a reheating steam pipeline 1, a shell-and-tube steam-water heater, and an intermediate steam pipeline leading to the primary air pulverized coal pipeline 5 for surface heating after the steam temperature drops to about 300°C 4. Steam pulverized coal heater 6, exhaust steam pipeline 7, isolation shut-off door 8 of exhaust steam pipeline, exhaust steam shut-off gate 10 and steam volume adjustment gate 9;

[0048] The steam extraction position is the steam main pipe in the reheating hot section. The extraction steam pressure and temperature vary slightly with the boiler capacity parameters. Under low load, it is generally 2~3MPa, and the steam temperature is 500~570℃. The extracted reheated steam heats the boiler water at the outlet of the economizer through the shell-and-tube heat exchanger (i.e., the steam boiler water heater 3), so that the temperature of the boiler water in the outl...

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Abstract

The invention discloses a supercritical boiler flexible peak shaving system and method. A cold inlet of a steam boiler water heater communicates with an outlet of a coal economizer outlet header pipe and a water-cooled wall lower collecting box, and a steam pulverized coal heater is arranged on a primary air pulverized coal pipeline; and an inlet and an outlet of a hot steam extraction pipeline communicate with a reheating hot section steam mother pipe and a hot inlet of a steam boiler water heater respectively, a hot outlet of the steam boiler water heater is connected with a hot inlet of the steam pulverized coal heater, and a hot outlet of the steam pulverized coal heater is connected with a bled steam exhaust pipeline. The problem that the wet-state conversion load is high when a supercritical boiler runs under the ultra-low load is solved. Under the working conditions that a unit operates under ultra-low load and the boiler needs to be converted into wet state operation, boiler water from the outlet of the coal economizer to the water-cooled wall lower collecting box is heated, the ignition environment of pulverized coal is improved, and conversion into the wet state is delayed in the load reduction process; and steam heats primary air pulverized coal airflow, the temperature of the pulverized coal airflow is increased, pulverized coal ignition heat is reduced, and combustion stability is improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive transformation of supercritical boiler flexible peak regulation, and relates to a supercritical boiler flexible peak regulation system and method. Background technique [0002] Vigorously developing new energy is the direction of energy development and a requirement for accelerating the construction of ecological civilization. In recent years, new energy and nuclear power have continued to develop rapidly, and installed capacity and power generation have increased significantly year by year. With the adjustment of the energy structure and the accelerated development of clean energy, the power grid in some areas has insufficient peak-shaving capacity during the winter heating period, making it difficult to accommodate new energy, and the problems of abandoning wind, solar and water in some areas are prominent. Further tapping the deep peak-shaving capability of traditional coal-fired units, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/00F22B1/00F22B37/54F22D1/32F28B9/08F01D15/10
CPCF01D15/10F22B1/00F22B37/54F22D1/32F23D1/00F28B9/08
Inventor 薛宁魏铜生姬海民张知翔温寒健韩键平杜南京李亮辉
Owner XIAN THERMAL POWER RES INST CO LTD
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