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250 MW supercritical tower-type fan and Pi-type fan milled lignite boiler

A technology of supercritical tower type and fan mill, which is applied to steam boilers, steam boiler accessories, steam boiler components, etc., can solve the problems of difficult burning of lignite, meet the requirements of energy saving and consumption reduction, and overcome the difficulties of improving efficiency. Effects of market competitiveness and market availability

Inactive Publication Date: 2020-10-30
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to meet the requirements of energy saving and consumption reduction, the present invention develops a high-efficiency small-capacity supercritical boiler, and then provides a 250MW supercritical tower fan and π-type fan grinding lignite boiler to solve the market problems on the basis of the prior art. There is an urgent need for small-capacity supercritical boilers burning lignite to solve the problem that lignite is difficult to burn

Method used

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  • 250 MW supercritical tower-type fan and Pi-type fan milled lignite boiler
  • 250 MW supercritical tower-type fan and Pi-type fan milled lignite boiler

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specific Embodiment approach 1

[0023] Specific implementation mode one: combine figure 1 Describe this embodiment, a 250MW supercritical tower fan pulverized lignite boiler described in this embodiment includes an economizer 1, a water wall 2, a superheater system, a reheater system, a starting system 5, a combustion system 6 and The flue air system 7, the economizer 1, the superheater system and the reheater system are all installed on the upper part of the boiler furnace, the water wall 2 and the combustion system 6 are all located at the lower part of the boiler furnace, and the starting system 5 and The water wall 2 is connected to the superheater system, and the flue air system 7 is connected to the tail of the boiler flue.

[0024] The water cooling wall 2 mainly includes the lower spiral tube coil, the upper part adopts the vertical tube coil water cooling wall and related connecting pipes and headers, and the spiral tube coil water cooling wall and the vertical tube coil water cooling wall are divid...

specific Embodiment approach 2

[0028] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the reheater system described in this embodiment includes a primary reheater 4-1, a secondary reheater 4-2, and related pipelines and headers; the primary reheater 4-1 and The secondary reheater 4-2 is arranged at the lower part of the economizer 1 from top to bottom.

[0029] The steam temperature adjustment of the reheater system mainly depends on the reheater desuperheater arranged between the two-stage reheaters, and the inner and outer pipes are cross-connected.

[0030] Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0031] Specific implementation mode three: combination figure 1 Describe this embodiment, the superheater system described in this embodiment includes a primary superheater 3-1, a secondary superheater 3-2, a tertiary superheater 3-3 and related pipelines and headers, a secondary superheater 3- 2 is located between the first-stage reheater 4-1 and the second-stage reheater 4-2, and the third-stage superheater 3-2 and the first-stage superheater 3-1 are arranged on the second-stage reheater 4-1 from top to bottom The lower part of 2.

[0032] The first-stage superheater 3-1 and the third-stage superheater are arranged in front of the outlet section of the furnace, and mainly absorb the radiant heat in the furnace. The secondary superheater 3-2 is arranged between the primary reheater 4-1 and the secondary reheater 4-2, and absorbs heat by convective heat transfer. The steam temperature adjustment in the superheater system adopts fuel / feed water ratio and two-stage four-point ...

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Abstract

The invention relates to a mill lignite boiler, in particular to a 250 MW supercritical tower-type fan and Pi-type fan milled lignite boiler, and aims to solve the problem of difficulty in combustionof lignite. The 250 MW supercritical tower-type fan milled lignite boiler comprises an economizer, a water wall, a superheater system, a reheater system, a start-up system, a combustion system and a flue gas and air system, wherein the economizer, the superheater system and the reheater system are all installed at the upper part of a boiler furnace, the water wall and the combustion system are alllocated at the lower part of the boiler furnace, the start-up system is connected with the water wall and the superheater system, and the flue gas and air system is connected with the tail of a boiler flue. Based on the research of an existing 250 MW subcritical lignite boiler, the 250 MW supercritical fan-milled lignite boiler is developed, the difficulty of improving the efficiency of small-capacity units is overcome, the problem of difficulty in combustion of high-moisture lignite for combustion is solved, energy saving and consumption reduction are realized, and the 250 MW supercriticalfan-milled lignite boiler has very high market competitiveness and market practicability.

Description

technical field [0001] The invention relates to a lignite grinding boiler, in particular to a 250MW supercritical tower fan and π-type fan grinding lignite boiler. The invention belongs to the technical field of boiler equipment. Background technique [0002] According to relevant records, China's proven lignite reserves are more than 100 billion tons, accounting for 16.24% of the country's coal reserves, of which Inner Mongolia has the largest lignite reserves, accounting for 77% of the country's lignite reserves, and there are few mine sites and concentrated reserves. Many countries and regions in Southeast Asia and Europe are also rich in lignite reserves. Therefore, the efficient use of lignite is a favorable way to alleviate energy shortages. [0003] Lignite has the characteristics of high moisture and low calorific value. Lignite boilers make full use of the fan mill drying and upgrading technology to reduce the moisture of the coal used in the boiler coal and increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/22F22B31/08F22B37/12F22D1/02F22G7/14F23L15/00
CPCF22B1/22F22B31/08F22B37/12F22D1/02F22G7/14F23L15/00Y02E20/34
Inventor 高雷商宇薇胡双南龙志云王永杰
Owner HARBIN BOILER
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