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Circulating sulfurization bed hot water boiler


Boiler technical features:

1、 Energy saving

1. Reduce physical incomplete combustion losses q4:

Reduce the carbon content of large slag to 1%;

Bell shaped hood maze layout, no dust leakage, no dead spots in air distribution, and more uniform;

A new type of secondary air layout method, with stronger secondary air penetration and better combustion support effect;

Control the particle size of the fuel entering the furnace within 10mm;

Reduce the carbon content of fly ash to 5%;

The net height of the furnace is 1.5-2 meters higher than that of similar products;

Moderate fluidization speed (4.5-5.5m/s) with a residence time greater than 5 seconds;

Select the optimal circulation rate to improve the separation efficiency of the separator and ensure multiple fuel circulation combustion.

2. Reduce smoke exhaust heat loss q2:

Arrange sufficient heating surfaces to increase heat absorption;

Design the optimal exhaust temperature to strike a balance between reducing the exhaust temperature and preventing low-temperature corrosion at the tail. Design exhaust temperature 140 degrees Celsius

The air preheater is not equipped with Cordon steel or sugar ceramic tubes to prevent low-temperature corrosion.

3. Reduce plant power loss by 30%:

Improve the distribution height of the air distribution plate and the incident height of the secondary air, reduce the particle size of the incoming fuel, and improve the efficiency of the separator. Measures such as reducing the static height of the bed material will significantly reduce the auxiliary power consumption rate of the primary air fan, secondary air fan, and induced draft fan.

2、 Environmental protection

1. Desulfurization

Reasonably design the heating surface of the furnace to ensure a combustion temperature of 865 ℃, the optimal temperature range for desulfurization and denitrification, and adjust the area of the furnace, cyclone separator, superheater screen, superheater, and economizer accordingly;

According to the coal type, measures such as adding limestone powder to the furnace return feeder and desulfurization tower after the furnace are taken to ensure that the original emission of SO2 is less than 100mg/Nm2;

2. Integrated design of denitrification

The designed bed temperature is 865 ℃;

Low oxygen design, with an oxygen content controlled at 3%;

Strictly implement graded air supply, with primary air controlled below 50%;

Ensure that the NOx emission at the furnace outlet is below 200mg/Nm;

SNCR technology is used for supporting the entire furnace outlet; Ensure that the NOx in the tail flue is below 100mg/Nm.

Boiler structural characteristics:

1. Optimization design of the core component of the boiler - a cyclone separator

The boiler needs to reduce the combustion temperature of the furnace face to 850-880 ℃ to meet environmental indicators such as desulfurization and denitrification. This greatly reduces the radiation heat transfer of the boiler, increases the convective heat transfer ratio of the boiler, and improves the efficiency of the separator:

Optimize the design of the cyclone separator, reduce the carbon content of fly ash, improve combustion efficiency and boiler efficiency;

Optimize the design of the cyclone separator, control the emission of SO2 below 100mg/m, and improve the utilization efficiency of limestone powder: