1, product overview and main features

Rice husk is hard. The ignition temperature of rice husk is 300 - 400 DEG C, the content of volatile is high, the precipitation of volatile component is rapid, and the combustion is mainly concentrated in the volatile phase of the gas phase combustion.

At present, there are chain boiler and vertical circulating fluidized bed boiler. Chain furnace is difficult to burn rice husk, boiler thermal efficiency is low, serious waste of fuel. The vertical circulating fluidized bed boiler is not high enough, resulting in high carbon content of fly ash, high temperature separation at the same time, the separator is easy to coke, in the actual operation, it is difficult to burn rice husk, mixing coal. The boiler is a good solution to the above problems:

(1) the rice husk combustion is complete and the boiler thermal efficiency is high;

Horizontal circulating fluidized bed boiler furnace, take three two ash structure, effective furnace boiler is higher than the vertical circulating fluidized bed, the rice husk have sufficient time to burn, and through the two level of ash and reasonable air distribution, the carbon content of fly ash of rice husk was further reduced. According to the measured results, the content of combustible matter in fly ash is less than 3%. Tested by Fujian boiler pressure vessel Research Institute, the thermal efficiency of the company's 15t/h rice husk circulating fluidized bed boiler reached 88.98%.

(2) the separation of medium temperature to solve the problem of separator coking;

Horizontal circulating fluidized bed boiler adopt temperature separation structure, separation temperature at 400-500 degrees, so as to avoid the high temperature separation circulating fluidized bed (vertical separation temperature at 850-900 Deg. C) caused by coking separator.

(3) to pure burning rice husk, and no extra material;

The boiler adopts reasonable air distribution structure, the dense phase zone of special and high grade two ash structure, can make the boiler burning rice hull, without extra bed material.

(4) effective treatment of wear;

The Si content of rice husk ash is high, and the abrasion of boiler is serious. The utility model adopts a lower fluidization wind speed, reduces the abrasion of the boiler, and carries out the anti abrasion treatment in the parts which are easy to wear.

(5) ash can be utilized comprehensively.

Because the boiler burning rice hull, and bed material, the rice husk ash without impurities mixed; the burning of rice husk ash very completely, about 90% SiO2, the production of silica ash is a good raw material.

2, the main technical parameters

Boiler type horizontal circulating fluidized bed boiler

Rated output 4 ~ 90t/h

Steam pressure 1.25 ~ 5.29MPa

Steam temperature 193 to 485 DEG C

Furnace wall

Rice husk design

Rice husk calorific value 3000 ~ 3200kcal/kg

Boiler thermal efficiency 87 ~ 90%

Dust bag dust removal

NOx treatment of low temperature staged combustion

Exhaust temperature 145 DEG C

Power generation and steam supply