Energy saving and environmentally friendly horizontal circulating fluidized bed boiler technology

Mondo Finance Updated on 2024-02-05

The horizontal circulating fluidized bed boiler technology is proposed for the current vertical circulating fluidized bed combustion equipment, which is a combustion equipment and circulating combustion method based on the characteristics of circulating fluidized bed. It can not only be miniaturized, but also has all the advantages of circulating fluidized bed boiler, can be widely used in the combustion of various special fuels, with high combustion efficiency and low pollution emissions.

The fundamental characteristics of the technology of horizontal circulating fluidized bed boiler are two: one is horizontal; The second is the multi-stage material circulation, that is, the material enters the adjacent auxiliary combustion chamber after the combustion of the main combustion chamber, through inertial separation, a part of the hot material directly returns to the main combustion chamber through the inclined structure, and the other part of the hot material returns to the secondary combustion chamber behind with the flue gas, and finally separates through the separator, and returns to the main combustion chamber by the separator material leg, forming a two-stage or more gas-solid two-phase flow material circulation.

The advantages and outstanding effects of the patented technology of horizontal circulating bed

1) The horizontal circulating bed adopts horizontal horizontal arrangement, which can greatly reduce the height of the boiler, save the steel consumption of the boiler, and effectively reduce the cost of the boiler, and at the same time, the construction cost of the boiler plant can be greatly reduced due to the reduction of the boiler height. After the height of the boiler is reduced, the cost of the steel frame is reduced, and the stability of the boiler is good, which can make the structure of the boiler and the plant more compact.

2) The material in the horizontal circulating bed combustion equipment forms a two-stage cycle, and the fuel can increase the contact time with the material to achieve full convergence and improve the combustion efficiency. The horizontal circulating bed can also be developed according to the characteristics of capacity, fuel and other characteristics of the development of two-stage and above multi-stage circulating fluidized bed boilers.

3) Due to the change of the traditional vertical circulating fluidized bed form, the horizontal circulating bed combustion equipment has all the advantages of circulating fluidized bed, which is an efficient and clean combustion technology with a wide range of fuel adaptation, and has high combustion efficiency, desulfurization and denitrification in the furnace, and has the advantages of low NOx and SOX emissions.

A brief introduction to the structure of the patented horizontal circulating bed technologyThe product is a horizontal horizontal fluidized bed boiler, including a multi-stage combustion chamber, a separator, a tail heating surface and other parts. The flue gas enters the secondary combustion chamber through an opening at the top of the main combustion chamber, which is separated by a furnace wall. The separator is placed at the rear end of the burnout chamber, and the tail can be installed with a heating surface such as an economizer as needed. After the fuel and bed material enter the auxiliary combustion chamber through the main combustion chamber, by inertial separation and flue gas entrainment, a part of the bed material returns to the main combustion chamber, and a part enters the combustion chamber from the right bottom of the auxiliary combustion chamber, and returns to the main combustion chamber after separation by the separator, thus forming a material circulation of two or more stages. The final stage of the gas-solid separation unit can operate in the range of 850 300. In order to be compact and convenient to arrange, an external economizer can be set to further improve the thermal efficiency of the boiler.

At present, there are also boilers on the market known as horizontal fluidized bed or horizontal circulating bed, which are essentially boiling furnaces with bubbling fluidization, or simply reduce the height of vertical circulating bed boilers, and the product performance (such as efficiency and emission effect) is very different from the horizontal circulating bed boilers described in this article.

Product features of patented horizontal circulating bed technologyThe actual horizontal circulating bed boiler products have the following unique features:

1) The boiler has high thermal efficiency, obvious energy-saving effect and low operating cost. The actual operating thermal efficiency can reach about 85%, which is significantly higher than that of chain boilers.

2) Low pollutant emission and good environmental performance. Low temperature combustion is adopted, and the amount of NOx produced is small; It can realize desulfurization in the furnace, and it is not necessary to be equipped with a separate flue gas desulfurization device, which can achieve low-cost and high-efficiency desulfurization.

3) Wide adaptability of fuel types. Not only bituminous coal can be burned, but also lignite, anthracite, lean coal, coal gangue and other inferior fuels, or mixed with the above fuels.

4) The boiler adopts a membrane wall structure, which has good sealing and thermal insulation effect.

5) The boiler is horizontally arranged, with compact structure and small footprint.

6) The boiler runs reliably and has a low failure rate.

7) Easy to operate and small maintenance.

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