NB/T 34005-2020Test method for clean heating stoves (English PDF)

4.1 Test equipment

a) Water tank, heat preservation, capacity 1m³, 1.5m³;

b) Platform scale, accuracy level III;

c) Clock, the daily difference is less than 1 min;

d) Thermometer with a resolution of 0.2°C;

e) Anemometer, with an accuracy of 0.5;

f) Smoke (gas) tester;

g) Flue gas analyzer.

4.2 Test conditions

a) The ambient temperature is 10°C~35°C;

b) The wind speed is less than 1.0 m/s;

c) The furnace should be far away from other heat sources during the test. When multiple furnaces are tested in the same place, the distance should be greater than 1m.

4.3 Test preparation

4.3.1 The test personnel should be familiar with the operating methods of stoves and have stove test experience.

4.3.2 Calibrate the instrument as required.

4.3.3 When the rated heat supply of the stove is not more than 15kW, a 1m³ water tank is used for the test, and 1.5m³ when it is greater than 15kW. The bottom of the water tank is above the ground The surface is not less than 1.2m.

4.3.4 Prepare the fuel required for the test according to the rated heat supply of the stove and the instructions provided by the stove manufacturer. The amount of clean coal fuel should be It is guaranteed to burn for more than 4h under the rated heat supply, and more than 3h for biomass fuel, as shown in Table 1.

4.3.5 Measure the low calorific value of coal received based on the provisions of GB/T 213.

4.3.6 Measure the low calorific value of biomass fuel received based on the provisions of GB/T 30727.

5.1 Test preparation

5.1.1 Connect the water inlet and outlet of the stove, the smoke outlet with the water tank and the test equipment.

5.1.2 Fill the water tank to 90% of its capacity, and record the water temperature and water volume.

5.1.3 Calculate and weigh the fuel consumption according to the rated heat supply of the stove, 3h for clean coal stoves and 2h for biomass stoves.

5.1.4 Fill the water jacket of the furnace body with water, place the firelighter and fuel in the furnace, and ignite.

5.1.5 When the outlet water temperature rises to 75°C, open the valve to discharge water into the water tank, and control the outlet water temperature at 75°C to 80°C.

5.1.6 Adjust the stove to the rated heating condition, record the position of the fuel layer and the combustion status, and prepare to start the thermal performance test.

5.2 Heating performance test

5.2.1 When the stove reaches a stable heating state, start the heating performance test, and record this time T1.

5.2.2 During the test, add the weighed fuel according to the operating instructions of the stove, and wait until the test time reaches 3 hours of clean coal or 2 hours of biomass.

The fuel layer position and combustion conditions in the tool are consistent with those at the beginning of the test. Stop the test and record the end time T2 and the amount of fuel added.

5.2.3 During the test, record the outlet water temperature and inlet water temperature every 10 minutes, and record the water output.

5.2.4 During the statistical test period, the fuel consumption (B), total water output (Gz), total water average temperature (tcp) and total water average temperature (tjp) are counted.

5.2.5 The power consumption of stoves with fans and automatic control shall be measured.

5.3 Cooking power test

5.3.1 The cooking power test is carried out during the heating performance test, and there should be a fuel quantity that can maintain stable combustion for more than 1 hour in the furnace.

5.3.2 When the diameter of the test evaporator is 240mm, the initial boiler water volume is 5kg; when the diameter is 280mm, the initial boiler water volume is 7kg.

5.3.3 Pour the weighed water into the pot, and record the initial pot water volume G1.Cover the evaporating pot and place the lid on the stove fire to make the pot water rise gradually Wen, ready to start the cooking power test.

5.3.4 The temperature measuring point of the pot water should be located at the center of the evaporating pot and about 10mm away from the bottom of the pot.

5.3.5 When the pot water temperature rises to the boiling point, open the pot cover and start the cooking power test, and record the time and boiling point temperature at this moment. Pot water evaporates for 60min After that, immediately remove the evaporating pot and weigh the remaining pot water G2 to end the cooking power test.

5.4 Calculation of test results

5.4.1 The heat supply is calculated according to formula (1). Where. Pn-heat supply, in kilowatts (kW);

Gz-total water output, in kilograms (kg); tcp-the average temperature of the total effluent, in degrees Celsius (°C); tjp-the average temperature of the total inlet water, in degrees Celsius (°C); T2-T1 - Test time, in seconds (s).

5.4.2 The heating thermal efficiency is calculated according to formula (2). Where. eta-thermal efficiency; B - Fuel consumption, in kilograms (kg);

Qnet.v.ar - The received base low calorific value of the fuel, in kilojoules per kilogram (kJ/kg).

5.4.3 Cooking power is calculated according to formula (3). Where. Pc-cooking power, in kilowatts (kW);

G1 - The initial water volume in the evaporator, in kilograms (kg);

G2 - The amount of remaining water in the evaporator, in kilograms (kg); r - The average latent heat of vaporization of the boiler water at the average evaporation temperature, in kilojoules per kilogram (kJ/kg).

6.1 High-power air pollutant emission test