QXX series circulating fuidized bed(CFB) hot water boiler introduction

With the development of the economy and the improvement of living standards, the demand for urban centralized hot water heating has gradually increased. In the past decade, hot water heating has developed rapidly in China. Circulating fluidized bed combustion technology is a clean coal combustion technology developed in the past 20 years. Circulating fluidized bed hot water boiler has outstanding advantages such as wide fuel adaptation, high combustion efficiency, low nitrogen oxide emission, low-cost limestone furnace desulfurization, strong load adaptability and combustible inferior fuel.

There are many types of circulating fluidized bed boilers, such as DHX circulating fluidized bed boiler, SHX circulating fluidized bed boiler and QXX circulating fluidized bed boiler. The boilers have different models and different capacities, and the thermal efficiency of the boilers will be different. Generally, the larger the boiler capacity, the higher the thermal efficiency.

QXX series circulating fluidized bed hot water boilers are widely used in the heating system of heating systems and heating companies in cities and enterprises. This type of boiler adopts indoor layout, and can also be used in open air. It can burn low-calorie fuels such as anthracite, bituminous coal, lignite and coal gangue. It has remarkable environmental protection and energy saving effect and wide load regulation range. It is the first choice for urban central heating and has high economic and environmental benefits.

Product Features

The QXX series circulating fluidized bed hot water boiler has a simple and compact structure. The boiler body is composed of combustion equipment, coal feeding device, water cooling system, separator, economizer, air preheater, steel frame, escalator, furnace wall, etc., and adopts all steel frame structure. The energy-saving circulating fluidized bed hot water boiler arranges the combustion chamber, the separator and the tail flue in order from the front to the back of the furnace to ensure good sealing performance.

The high temperature zone adopts a full-membrane wall sealing structure, a fully suspended type, and a fixed expansion center. The material legs and the water wall of the furnace are integrated and expanded to improve the reliability of operation and reduce heat loss. The coal feeder is arranged in front of the furnace, and the air required for combustion is provided by the primary and secondary fans respectively. The large amount of flue gas generated by the combustion of the fuel in the furnace carries the material, and the flue gas and the material are separated by the separator, and the separated materials are returned to the furnace through the returning device and re-burned. The bed temperature can be conveniently adjusted by adjusting the amount of coal supplied, the amount of primary and secondary air, its ratio, and the bed inventory.

Product Advantage

1, Because the gas-solid mixing of the circulating fluidized bed boiler is good, and the fuel particles can be recycled, the residence time of the fuel particles in the furnace is greatly lengthened, and the combustion efficiency can reach 97-99%, and the boiler thermal efficiency reaches 85% (higher than the country). Standard 15-20%), with significant energy saving and economic benefits. For the society, it reduces energy waste, reduces total dust emissions, and has great social benefits.

2, The circulating fluidized bed has a high gas flow rate and a convenient material concentration to control its heat absorption, so its adaptability to change is very large, and the load range adjustment ratio can reach 1/3 to 1/4. Regardless of the high and low loads, the combustion efficiency can maintain a relatively constant value, while the load adjustment speed is fast, with an average of 5% per minute. Therefore, the furnace is used for peaking boilers, and the unit with frequent load changes is particularly suitable.

3, The circulating fluidized bed combustion temperature is only about 850 ° C ~ 950 ° C, which is a low temperature combustion. At the same time, it can also adopt segmented air supply, staged combustion, air is sent from different heights along the combustion flow, and the combustion chamber is in a cyclic combustion state. Therefore, the technology has three major advantages in environmental protection.

4, The circulating fluidized bed boiler has a high volumetric thermal load, and its dense phase zone cross-sectional area is only 1/3 to 1/2 of that of a conventional fluidized bed boiler. At the same time, the dense phase zone is an adiabatic room, so the ignition is convenient and fast, and the fire time can be up to 30 hours.

5, Since the circulating fluidized bed boiler has few mechanical transmission parts and no buried surface heating surface, it can fundamentally eliminate the failure of the grate transmission and the wear of the buried pipe, prolong the operation cycle and reduce the labor intensity of the workers.

Technical data