Li Haijun, Liu Lei, Wang Shiyuan
Abstract: Several thermal performance parameters of household biomass pellet furnace under different molding fuels were measured by using DR230 temperature intelligent inspection instrument, etc. The results show that the combustion results of different shaped fuels are not significantly different, The environmental indicators such as CO, NOx and soot concentration in the exhaust gas from the biomass-formed pellet fired furnace are much lower than the coal-fired furnaces and meet the requirements of the national industrial boiler air pollutant discharge standards.
The domestic biomass pellet furnace adopts the vaporization combustion technology, which is easy to operate, easy to ignite, large in fire intensity, easy to control and high in thermal efficiency. It only needs to put the right amount of granular fuel in the hopper once, and adjust the fuel with the attached knob when burning How much, so as to control the size of the firepower, burning state and straw, wood and other raw materials when burned exactly the same, and smoke-free, no choking.Because of full combustion, basically no ashes.With the way similar to the coal-fired stove, Clean, safe than gas cooker, suitable for living in rural areas most of the cooking energy.
1 biomass molding pellet fuel cooking stove works
The biomass pellet fuel is added to the grate in the furnace through the feeding port of the fuel furnace, and the pellet fuel is ignited by the primary air duct. After the pellet fuel is burned, the wind deflector of the primary air duct is adjusted so that the particulate fuel is deoxygenated and combustible, Gas; at the same time adjust the secondary air duct deflector, so that the resulting combustible gas combustion in the stove 15. Biomass forming pellet fuel gas production at the end of regulation of the air duct and adjust the secondary air duct block Wind board, so that the remaining charcoal burning until the burn. Water jacket can absorb flue and furnace side heat, in order to improve the thermal efficiency of the stove.
2 Experimental research
2.1 Test methods
According to GB / T 16155-1996 "Household cooking plumbing thermal performance test methods", GB 9079-1988 "Test method for industrial furnace smoke and dust", GB / T 213-2003 "Determination of coal heat," GB / T 5186-1985 "Test Method for Heat of Biomass Fuel", GB 6412-1986 "Test Method for Household Coal and Stove" and GB 13271-2001 "Emission Standard of Air Pollutants for Boilers" Performance and environmental indicators for testing.
2.2 test procedures and calculations
2.2.1 Test Procedure
The water tank filled with water jacket, and record the inlet temperature θj1, in the evaporation pot, the temperature of 25 ° C water into the lid of the lid of the evaporation pot, and record the initial evaporation pot water (Gn1) Furnace feed device to the furnace biomass biomass pellet fuel, ignition and record ignition initiator ignition time t1, get on the evaporation pan, start the test water jacket water temperature rose to 75 ℃, open the valve, to the water bucket At the same time observe the water temperature changes, regulating the current limiting valve, control the water temperature is 75 ~ 80. When the water temperature is below 75 ℃, turn off the valve to stop the water .When the water is discharged, record the water temperature once every 2min, measure this Times the amount of water and the average effluent temperature.This process is repeated.During the test period, record the water temperature once every 10 minutes.When the water temperature rises to the boiling point, open the lid and record the time t2 and the pot water temperature θn1, start During the evaporation of the boiler water, the temperature of the boiler water was recorded once every 5 minutes and the average temperature was calculated. After the boiler water evaporated for 1h, the boiler lid was covered and the remaining boiler water Gn2 was immediately weighed to finish the cooking fire intensity Test by adjusting once and two The second throttle, the cooking stove adjusted to a stable combustion state, the efficiency test.Calculation of the entire process of the water jacket total outflow Gc, the average water temperature θc and the average water temperature θj.At the end of the heating test to measure the water jacket Gt and Its temperature θt.
2.2.2 Calculation of test results
2.3 test results
The test fuel was ① hydroformed straw, ② hydroformed corn stalks, and ③ hydoformed sorghum stalks.The pellet fuel had a diameter of 6 mm or 8 mm and a length of 20-30 mm, a volumetric mass of 1.0 t / m3 and a water content of 7.0% Their application base low calorie respectively 13498,14684,14258kJ / kg in the biomass pellet fuel cooking stove experiment, the results of the parameters shown in Figure 2.
3 Conclusion
1) According to the experiment of biomass briquetting in 3 experiments, the biomass burning rate, cooking fire intensity, fuel consumption, cooking efficiency, waste heat efficiency, exhaust gas temperature, Smoke and dust content and other thermal performance parameters to meet the design requirements, and 3 in the pilot test results are not very different, fuel adaptability, to prove that the design method is correct and scientific; the biomass pellet fuel The price of cooking stoves is equivalent to the price of coal-fired stoves with the same capacity, and the operation is relatively easy. The utilization rate of biomass energy is greatly raised, and the economic benefit is high.
2) It can be seen from the experiment that the environmental indicators such as CO, NOx and soot concentration in biomass-fired particulate cooking fume exhaust are much lower than that of coal-fired stoves and meet the requirements of the National Industrial Boiler Air Pollutant Emission Standards Environmental benefits.
3) The successful development of this bio-pellet fuel cooking stove will surely promote the vigorous development of China's biomass (straw) molding industry and open up new ways for straw utilization, which is of great significance for China to replace coal with straw and achieve sustainable energy development Important practical significance and far-reaching historical significance.
