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What is a circulating fluidized bed boiler?

2020-07-21 17:12    page view:

Guide: Circulating fluidized bed combustion technology is a clean, low-temperature coal combustion technology developed and promoted in recent years. The circulating fluidized bed boiler adopts fluidized combustion, and the main structure includes the combustion chamber (including the dense phase zone and the dilute phase zone) and the cycle back to the furnace (including the high-temperature gas-solid separator and the return system).

Circulating fluidized bed combustion technology is a clean, low-temperature coal combustion technology developed and promoted in recent years. The circulating fluidized bed boiler adopts fluidized combustion, and the main structure includes the combustion chamber (including the dense phase zone and the dilute phase zone) and the cycle back to the furnace (including the high-temperature gas-solid separator and the return system).

  On the basis of summarizing and drawing lessons from the mature technology of domestic circulating fluidized bed boilers, our company has carried out targeted technical upgrades and product replacements. Product technical performance, energy saving and environmental protection performance, operational reliability, and maintenance have been significantly improved and improved. The SHX series fluidized bed boiler utilizes circulating floating combustion technology, has high thermal efficiency, high desulfurization rate, low NOx emission, simple structure, convenient operation, etc. It has good application prospects and is an ideal product to replace traditional boilers.

Work flow: The fuel is sent into the furnace through a conveyor, mixed with air in the dense phase area, fluidized and burned. The high-temperature flue gas carries a large number of burning solid particles to wash out the dilute phase area, while burning, while transferring the heat released by the combustion to The heating surface, the heating medium (water), and the unburned solid particles enter the separator, are collected, and are sent back to the dense phase area through the return device for circular combustion, thereby improving the combustion efficiency. The small solid particles of the ashes escape from the separator along with the high-temperature flue gas, scour the convection heating surface and the tail heating surface, and are discharged into the atmosphere after being removed by the dust collector.

Performance advantage

  1. Wide range of combustible fuels

  The temperature in the furnace chamber can be maintained uniformly in a stable range (850℃~950℃). The fuel particles added to the furnace are quickly heated to the temperature of the furnace and ignite. Therefore, the circulating fluidized bed boiler can burn various solid fuels without auxiliary fuel.

  2. High combustion efficiency

   After the fuel enters the furnace of the boiler, it is quickly mixed with a large amount of hot bed material, and immediately ignites and burns with a high burning rate. In addition, the unburned particles separated by the cyclone separator are sent back to the furnace to be cyclically burned, which prolongs the fuel burning time and facilitates the burning of the fuel.

  3. Good desulfurization effect

The desulfurization agent in the circulating fluidized bed boiler is desulfurized at the corresponding reaction temperature in the furnace. The internal circulation and external circulation of the fuel and materials in the furnace make the average residence time of the desulfurizer in the boiler longer, and the desulfurization process full. In addition, the particle size of the desulfurizing agent added to the boiler is small (0.1mm), and the reaction contact area with the material is large, so that the desulfurization efficiency is higher.

  4. Low NOx emissions

   The furnace temperature of the circulating fluidized bed boiler is between 850°C and 950°C, the temperature is lower, and the generated NOx is less. In addition, the circulating fluidized bed adopts staged air supply and staged combustion, which can effectively reduce the generation of NOx.

  5. High heat load on furnace section

   Strong mixing in the furnace, fast heat transfer, high heat load on the furnace section, generally 3~5MW/㎡.

  6. ​​Ash and slag can be used in a variety of ways

Because the circulating fluidized bed boiler has low temperature combustion and high combustion efficiency, the ash discharged from the boiler has not been melted and has a small carbon content, and the ash contains a large amount of calcium oxide and calcium sulfate, which can be used for cement admixtures and construction Comprehensive utilization of materials and brick and tile production.

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