Determination of the optimal weight during drying of materials microwave energy supply

Timetable 1.
Chanching the weight of the material to be dried in discreet mode.

0	200	200	0	0
47	196,9	197,8	-0,9	0,81
159	181,2	180	1,2	1,44
382	162,4	161,44	0,96	0,9216
612	146,5	146,948	-0,448	0,200704
812	134,8	135,338	-0,538	0,289444
1027	116,1	115,607	0,493	0,243049
1217	98,84	99,228	-0,388	0,150544
1424	86,3	85,227	1,073	1,151329
1657	74,5	73,022	1,478	2,184484
1990	60,6	62,154	-1,554	2,414916
2346	52,8	52,478	0,322	0,103684
2870	42,5	43,646	-1,146	1,313316
3722	34,8	35,552	-0,752	0,565504
5602	29,2	28,072	1,128	1,272384
7581	22,02	21,117	0,903	0,815409
22450	19	19,001	-0,001	1E-06
28680	19,2	18,41	0,79	0,6241
			2,62	6,8644
				21,36487

Character of change in the mass transfer coefficient of the drying process. In the example of pumpkin, capillary porous plant that is dried in a series of calculations to determine the causes of balance, which blocked in the computer model. Figure 1 shows the drying process, the balance conditions are reflected in the calculation unit.

Figure 1. The gas phase in a computer model.
There is created a computer model of microwave drying using block.
The drying experiments on the computer gave me the opportunity to change several parameters simultaneously. For example, in Figure 2, there is a building material balance temperature, humidity, and concentration of solids, the actual temperature of 200 g of the product. Microwave on and off controlled by the amount of energy, the reduction of the moisture content of the product closer to the desired value. `

Figure 2. Description of the drying process of 200 grams of the product.	Figure 3. Expression of a computer model to changes in the weight of the product.

Changing expression of weight of the product to be dried in the computer models is shown in Figure 3. Diagram shows that 200 gramm initial product mass fell to 48 grams in 2000 seconds, and then to 20 grams in 4000 seconds.200 g of product in the drying the moisture content of 84% to 20%, when the construction of 4333 seconds, as compared with the mass of the product, with the proviso 23.655 seconds. Using the device brings the beginning in order to increase the mass of material. The product will continue to experience an initial weight of wax
500 grams of the product weight, the computer model does not experience a decrease in the frequency persists observed (Figure 4) changes in temperature. This allows the product to be dried to increase the mass of the primary. In drying process weight of the product is 238 grams per 2200 second, 119 grams in 6.000 seconds.
Increasing the mass of product to 1000 g, when the drying time is 2.200 seconds, product will be with a mass of 595.23 g, dry weight of the product will be 238.2 g, if the duration 6000 seconds (figure 5).

Figure 4. Description of the drying process of 500 grams of the product.	Figure 5. Description of the drying process of 500 grams of the product.

Currently experiment 35-50⁰С boundary. Baselines Wo = 86% moisture content of the product, microwave capacity ratio N = 0.9kV, mass Bo = 0.000006, the initial product weight Gg = 0,05 kg.

Figure 6. Dried material condition of the mass of 0.05 kg.	Figure 7. Dried material condition of the mass of 0.1 kg.
Figure 8. Dried material condition of the mass of 0.5 kg	Figure 9. The mass of material to be dried is 0.7 kg

Experience in the cases of product weight 0.05, 0.1, 0.2, 0.5, 0.7, 1.0, 1.5, 2.0, 3.0, 4.0, 5.0 kg (Fig.6-9)

The test results are shown in Table 2 and Scheme 10.
Table 2. Changes in the mass of the dried product.

№	weight, gram	time, sec
1	50	5932	118.640
2	100	6002	60.020
3	200	6172	30.860
4	500	6582	13.164
5	700	6815	9.735
6	1000	7088	7.088
7	1500	7452	4.968
8	2000	7801	3.900
9	3000	8405	2.801
10	4000	8888	2.222
11	5000	9300	1.864

10 pictures. Schedule change the time of the mass of the product
The results of physical experiments, computer simulations by using microwave energy drying process is carried out with an increase in the production of the initial weight reduction process takes place. Start time relative mass of 0.5 kg, is greatly reduced. After the initial effect, mass decreases to less than 3 kg. Thus, the magnitude of the initial weight is taken in the range from 0.5 to 3 kg for microwave hardware with 0.9 kW to achieve the best results.
CONCLUSIONS
The advantage of using the high-energy drying is that, in the near future we will be able to drain large quantities of product to be understood, drying is enough to find the optimal weight of the starting material. The computer model of a physical model results are compared and determined their value. The next conclusion that the experimental results, we can use all kinds of various dry bulk products 1 g Time Required: 5 kg product weight 1.86 sek / kg, 4 kg of 2,222 sek / kg, 3 kg 2.801 sec/kg, 2 kg of 3, 9 sec/kg, 1.5 kg and 4.96 sek/kg, 1 kg of 7,088 sec / kg, 0.7 kg of 9735 sek / kg in accordance with the schedule change in mass of drying time than occurs with the increase of weight of dry product from the process conditions discussed in the article shows the relative decrease of from 0.5 to 3 kg of the product obtained in the range from 0.9 kW microwave hardware for best results.
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