CN-122015081-A - Biomass boiler and four-span flue structure in shape of Chinese character' hui

CN122015081ACN 122015081 ACN122015081 ACN 122015081ACN-122015081-A

Abstract

The invention discloses a biomass boiler and a four-span flue structure in a shape like a Chinese character 'Hui', wherein the flue structure comprises a first span flue, a second span flue, a third span flue and a fourth span flue, the first span flue consists of an air distribution device, a tower-shaped hearth and a screen-type superheater at an outlet of the tower-shaped hearth, the second span flue is provided with a high-temperature heat insulation separator, the third span flue is provided with a burning-out cooling chamber flue, a convection superheater tube set and a high-temperature economizer, the fourth span flue is provided with a pin removal area SCR flue, a low-temperature economizer and a tail air preheater, and the third span flue and the fourth span flue are connected by a steering flue. The flue structure is arranged in a shape like a Chinese character 'hui', the flue structure is compact, the boiler depth ratio is optimized on the basis of ensuring the boiler performance, the occupied area is saved, and the problem of difficult installation and maintenance of SCR is solved.

Inventors

JIN HUI
Ju zhong
WAN YIFEI
HU LIANGLIANG
YAN XINYUAN

Assignees

江联重工集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (5)

1. A four-span flue structure in a shape like a Chinese character 'Hui' of a biomass boiler is characterized by comprising a first span flue, a second span flue, a third span flue and a fourth span flue; the first span flue consists of an air distribution device, a tower-shaped furnace and a screen-type superheater at an outlet of the tower-shaped furnace, the second span flue is provided with a high-temperature heat insulation separator, the third span flue is provided with a burning-out cooling chamber flue, a convection superheater tube set and a high-temperature economizer, the fourth span flue is provided with a pin removal area SCR flue, a low-temperature economizer and a tail air preheater, and the third span flue and the fourth span flue are connected through a steering flue.
2. The four-span flue structure in the shape of a Chinese character 'hui' of biomass boiler according to claim 1, wherein the flue structure is arranged in a Chinese character 'hui', the second span flue is a longitudinal extension of the first span flue, the third span flue is a transverse extension of the second span flue, the fourth span flue is a longitudinal extension of the third span flue, and the fourth span flue and the first span flue are transversely aligned.
3. The four-cross flue structure of the biomass boiler in the shape of the Chinese character 'hui', is characterized in that the structure of boiler combustion is carried out through the air distribution device, the tower-shaped furnace, the screen type superheater and the high-temperature heat insulation separator arranged in the first cross flue, the high-temperature corrosion is solved by adopting the burning-out cooling chamber flue and the subsequent convection superheater tube group arranged in the third cross flue, the low-temperature economizer, the pin removal area SCR flue and the tail air preheater are arranged at the upper part of the fourth cross flue, and the tail air preheater is arranged at the lower part of the fourth cross flue.
4. The four-span flue structure of the back-shaped structure of the biomass boiler according to claim 3, wherein flue gas generated by the boiler sequentially passes through the tower-shaped furnace and the screen-type superheater in the first span flue from bottom to top, then passes through the high-temperature heat-insulating separator of the second span flue to separate the flue gas, the separated flue gas flows through the burning-out cooling chamber flue of the third span flue, the convection superheater tube group and the high-temperature economizer from top to bottom, then enters the denitration region SCR flue and the tail air preheater of the fourth span flue through the steering flue, finally enters the boiler tail environment-friendly equipment and then enters a chimney.
5. A biomass boiler comprising the four-span flue structure in the shape of a Chinese character 'hui' of the biomass boiler according to any one of claims 1 to 4.

Description

Biomass boiler and four-span flue structure in shape of Chinese character' hui Technical Field The application belongs to the technical field of boilers, and particularly relates to a biomass boiler and a reverse-U-shaped four-span flue structure thereof. Background Biomass has been widely used as a clean renewable energy source. However, the active biomass boiler is generally subjected to typical problems such as high-low temperature corrosion, coking and ash blocking of a heating surface, and the like, so that the operation period of a unit is severely restricted. In the background of the increasingly stringent emission standards of nitrogen oxides (NO x), the denitration technology modification is urgently needed for a large number of biomass boilers. In order to cooperatively solve the corrosion problem, prolong the operation period and improve the economic benefit, the method is limited by the established structure of the original boiler, and optimizing the structural layout of the flue has become a key break for improving quality and improving efficiency of the biomass boiler. Disclosure of Invention The application aims to provide a biomass boiler and a four-span flue structure in a shape like a Chinese character 'Hui'. The structure solves the core pain points such as uneven burning structure, coking and ash blocking of a heating surface, high-temperature corrosion and the like of the biomass boiler in a cooperative manner while realizing the compactness of the structure by optimizing the depth ratio of the boiler, and in addition, the design effectively solves the problem that the installation and maintenance space of the SCR denitration system is limited. In order to achieve the purposes of the application, the technical scheme adopted by the application is as follows: The embodiment of the application provides a four-span flue structure in a shape like a Chinese character 'Hui' of a biomass boiler, which comprises a first span flue, a second span flue, a third span flue and a fourth span flue; The first span flue consists of an air distribution device, a tower-shaped hearth and a screen-type superheater at an outlet of the tower-shaped hearth, the second span flue is provided with a high-temperature heat insulation separator, the third span flue is provided with a burning-out cooling chamber flue, a convection superheater tube group and a high-temperature economizer, the fourth span flue is provided with a pin removal area SCR flue, a low-temperature economizer and a tail air preheater, and the third span flue and the fourth span flue are connected through a steering flue. Optionally, the flue structure is arranged in a "back" shape, the second cross flue is a longitudinal extension of the first cross flue, the third cross flue is a lateral extension of the second cross flue, the fourth cross flue is a longitudinal extension of the third cross flue, and the fourth cross flue and the first cross flue are laterally aligned. Optionally, the structure of boiler combustion is carried out through an air distribution device, a tower-shaped hearth, a screen-type superheater and a high-temperature heat insulation separator which are arranged in a first span flue, the high-temperature corrosion is solved by adopting a burning-out cooling chamber flue and a subsequent convection superheater tube bank which are arranged in a third span flue, a low-temperature economizer and an out-of-pin area SCR flue are arranged at the upper part of the fourth span flue, and a tail air preheater is arranged at the lower part of the fourth span flue. Optionally, the flue gas generated by the boiler sequentially passes through a tower-shaped furnace and a screen-type superheater in a first span flue from bottom to top, then passes through a high-temperature heat insulation separator of a second span flue for flue gas separation, the separated flue gas flows through a burning-out cooling chamber flue of a third span flue, a convection superheater tube set and a high-temperature economizer from top to bottom, then enters a denitration region SCR device and a tail air preheater of a fourth span flue through a steering flue, and finally enters a chimney after entering environmental protection equipment at the tail of the boiler. The embodiment of the application also provides a biomass boiler, which comprises the square-shaped four-span flue structure of the biomass boiler. Compared with the prior art, the embodiment of the application has the beneficial effects that: The reverse-U-shaped four-span flue structure provided by the embodiment of the application is suitable for a biomass circulating fluidized bed boiler, has a compact structure and reasonable arrangement, saves occupied area and investment, can solve the problems of overlarge arrangement depth-to-width ratio and unstable steel structure of a small boiler, is particularly suitable for solving the problems of the expansion of the boiler reconstruction and the insuffic