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Medium-pressure boiler is suitable for burning xinjiang quasi-east coal

A boiler and economizer technology, applied in the field of boiler combustion, can solve problems such as coking of boiler parts, boiler tube burst, and shutdown of the boiler, and achieve the effects of reduced coking tendency, low furnace heat load, and increased burnout height

Pending Publication Date: 2018-11-09
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that the existing boilers that use Zhundong coal produce coking and contamination of the overall parts of the boiler, resulting in frequent occurrences of boiler tube bursts and shutdowns, and further provide a boiler that is suitable for burning Zhundong coal in Xinjiang. medium pressure boiler

Method used

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  • Medium-pressure boiler is suitable for burning xinjiang quasi-east coal

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specific Embodiment approach 1

[0019] Specific implementation mode one: as figure 1 As shown, the medium-pressure boiler suitable for burning Xinjiang Zhundong coal in this embodiment includes an economizer system 1, a water wall system 2, a superheater system 3, a combustion system 4 and a flue gas system 5. The economizer The heating surfaces in the furnace of system 1 are arranged in series. The water wall system 2 includes a vertical tube ring water wall and headers, steam drums and downcomers connected to the vertical tube ring water wall. The combustion system 4 is located in the furnace In the corner surrounded by the water-cooled wall system 2, the flame forms four corners tangentially burned in the furnace. The wall superheater encloses the tail flue and the boiler roof, the low-temperature superheater and economizer system 1 are arranged in the rear shaft of the tail flue, the partition superheater is arranged on the top of the furnace, and the final superheater is arranged at the outlet of the fu...

specific Embodiment approach 2

[0020] Specific implementation mode two: as figure 1 As shown, the heating surface of the economizer system 1 in this embodiment is in the form of a plain tube or a finned tube. Such a design can increase the heating area. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0021] Specific implementation mode three: as figure 1 As shown, the combustion system 4 in this embodiment includes a main burner, a SOFA burner, a transmission device and an actuator, and the SOFA burner is arranged above the main burner. Such a design enables the pulverized coal to form a staged combustion in the boiler, which can reduce pollutant emissions. Other compositions and connections are the same as those in Embodiment 1 or 2.

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Abstract

The medium-pressure boiler is suitable for burning xinjiang quasi-east coal, and relates to a medium-pressure boiler. According to the boiler, the problem that an existing quasi-east coal boiler is used for generating coking of an integral part of the boiler is solved, the problems that the boiler is exploded and the furnace stopping phenomenon is frequently caused due to contamination are solved.The combustion system is located at an angle part defined by a water-cooled wall system in the hearth, four-angle tangential combustion is formed in the hearth through flames, a tail flue and a boiler top shed are defined by the ceiling ladle wall superheater, a low-temperature superheater and a coal economizer system are arranged in a rear vertical shaft of the tail flue, a separation screen superheater is arranged at the top of the hearth, a last-stage superheater is arranged in a flue at the upper part of an outlet of the hearth outlet, the transverse pitch range of the separation screen superheater is 500mm to 700 mm, the transverse pitch range of the low-temperature superheater and the transverse pitch range of the last-stage superheater are both 150mm to300 mm, and a hearth area, aradiation heating surface and a convection heating surface are provided with a plurality of soot blower. The medium-pressure boiler is suitable for burning xinjiang quasi-east coal.

Description

technical field [0001] The invention relates to a medium-pressure boiler, in particular to a medium-pressure boiler suitable for burning Xinjiang Zhundong coal, and belongs to the technical field of boiler combustion. Background technique [0002] The Zhundong coal belongs to the high-moisture coal with strong coking, serious contamination and severe corrosion in the Zhundong area of ​​Xinjiang. 2 The content of alkali metals such as O and CaO is extremely high, and the sulfuric acid compound salt formed by it is easy to volatilize under high temperature conditions and is in a molten state. When passing through the heating surface, it will condense on the heating surface tube to form sintered or cohesive ash deposits. Most of the formed deposits occur in the area of ​​the convective heating surface where the flue gas temperature is about 800°C, causing corrosion of alkali metals on the high temperature heating surface. The heating surface is prone to ash clogging, which wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B31/00F22B31/08F22G7/12F23J1/00F23J3/00
CPCF22B31/00F22B31/08F22G7/12F23J1/00F23J3/00
Inventor 郭飞夏良伟宋宝军李路明
Owner HARBIN BOILER
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