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circulating fluidized bed cfb boiler

Introduction: Circulating fluidized bed boiler adopts fluidized combustion, and its main structure includes combustion chamber (including dense phase zone and dilute phase zone) and circulation loop (including high temperature gas-solid separator and material return system). According to the market demand, ZOZEN Boiler has developed another coal-fired environmental protection masterpiece-SHX/DHX circulating fluidized bed boiler, which has a wide range of fuel applications and can be suitable for coal, gangue, garbage, sludge and other fuels.

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Introduction of circulating fluidized bed cfb boiler

Circulating fluidized bed cfb boiler is a boiler with fluidized combustion mode, and its main structure includes combustion chamber and circulating furnace, which has many advantages that other boilers do not have. Especially with the increasingly stringent domestic environmental protection requirements and the increasingly prominent contradiction between coal burning and environmental protection, circulating fluidized bed cfb boilers have become the first choice for high-efficiency and low-pollution boiler products.


As a leader in the industrial boiler industry, ZOZEN Boiler is strategically forward-looking, focusing on the R&D and design of low-emission circulating fluidized bed cfb boilers, and taking the lead in increasing the technical reserves in the field of low-emission boilers and strengthening the domestic market layout through information technology. At present, Huaibei Mining, Taikang Industrial Park, Ganfeng Lithium Industry, Qinghai Salt Lake and other enterprises have reached friendly cooperative relations with ZOZEN, all of which use circulating fluidized bed boilers produced by ZOZEN.

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Composition of circulating fluidized bed cfb boiler

Circulating fluidized bed cfb boiler is composed of boiler body and auxiliary equipment;

1. Boiler body: It mainly includes starting burner, air chamber, air distribution device, furnace, gas-solid separator, material return device, steam drum, downcomer, water wall, superheater, economizer and air preheater.


2. Auxiliary equipment of circulating fluidized bed cfb boiler: mainly including blower, induced draft fan, return fan, crusher, coal feeder, slag cooler, dust collector, desulfurization and denitrification equipment and chimney.

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Working principle of circulating fluidized bed cfb boiler

After the fuel is crushed to a suitable particle size by a crusher, it is fed from the upper part of the air distribution plate of the combustion chamber by a coal feeder, mixed with the hot boiling materials in the combustion chamber, and quickly heated. The fuel quickly ignites and burns, and a large number of solid particles are carried out of the combustion chamber under the action of a high airflow speed.


After being separated by a gas-solid separator, the separated materials return to the combustion chamber through a material return device to continue to participate in combustion. The high-temperature flue gas led out by the separator exchanges heat with the convection heating surface in the tail flue, passes through the dust collector and is discharged from the chimney.

Boiler for the textile industry
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Textile refers to a multi-scale structural processing technique of a fiber or fiber assembly, it includes many steam consuming sections including dyeing, drying, slashing, printing, pressing etc.., all of which needs steam from boilers. With the increase in the demand for textiles, the steam consumption of textile factories is also increasing. Whether building a new textile factory or rebuilding and expanding a textile factory are faced with the problem of boiler selection. Except for steam demanding, textile plants also need higher temperature heat source for printing, dyeing and hot-pressing sections, where thermal oil heaters will be used to heat the thermal oil to above 300°C high temperature, after the thermal oil are used for heat consuming machines, it will come back to boiler for circulating using. So, steam boiler and thermal oil heater combination is commonly used in textile plants, ZOZEN already provided completed solutions for over 50 customers.

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Environmental protection characteristics of ZOZEN circulating fluidized bed cfb boiler

1. Low sulfur emission

Adjusting the distribution of boiler heating surface to ensure the combustion temperature in the furnace is between 860-880, which is a better temperature range for limestone desulfurization in the furnace.

By injecting limestone powder into the furnace and combining with an efficient separator to catch finer particles, the limestone and flue gas can be mixed for many times to achieve the highest utilization rate of limestone in the furnace and the desulfurization efficiency in the furnace can reach over 90%. Combined with the measures of desulfurization tower outside the furnace, the original emission of SO2 is guaranteed to be below 35mg/Nm3.


2. low nitrogen emissions

Adopt low bed temperature design of 860-880℃; The design of low oxygen content is adopted, and the combustion adjustment oxygen content is controlled at 3%; Strictly carry out graded air supply, increase the proportion of secondary air volume by more than 50%, raise the position of secondary air entering the furnace, and ensure the combustion of anoxic reduction zone in the furnace; Ensure that the initial NOx emission concentration of the boiler is ≤ 100mg/nm3; The position of SNCR denitration interface is reserved at the inlet of separator; A space for installing SCR equipment is reserved between the two groups of economizer in the tail flue; Ensure that the final NOx emission concentration of the boiler is ≤50mg/Nm3 after the out-of-stock device.

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