Advantages of solar engineering in industrial solar thermal utilization
Issue Time:2017-04-26
Status quo of thermal energy in solar engineering industry. As we all know, china has three big energy networks: offshore oil, land gas pipeline, ultra high voltage power grid. Now another new energy network is also in the form of a distributed new energy network". Distributed new energy network includes distributed solar thermal and distributed solar photovoltaic. China's industrial energy consumption is hot water steam, two electricity. With the help of the workshop roof, industrial square can be implemented using distributed new energy.
1, there are three high energy consumption and high pollution industry: "coal and steel" and "coal" and "coal workers".
"Coal worker" refers to the coal source of industrial product manufacturing. China's industrial manufacturing industry has a characteristic, almost all of the production process with hot steam, thermal steam production equipment are almost all coal boilers. It can be seen that the solar heat production and industrial heat have the characteristics of positive utilization.
2, solar industrial hot water and solar hot water
Hot water and hot steam are two major media for industrial heat. In most cases, the hot water is the end of the consumption of heat medium; hot steam is the heat of the process temperature, but also a consumable.
Industrial production of heat, from the technical point of view, the temperature range is relatively large; from low temperature hot water, high temperature hot water to steam. In fact, the use of industrial heat, is a hot water to the hot steam of the thermal cycle". Industrial solar thermal utilization, which is synchronized to the "thermal cycle", the specific form is to complete a low temperature hot water from the hot water, until the output of high temperature steam "thermal ring". The thermal energy cycle is completed, even if the highest stage of industrial solar thermal utilization is achieved. Industrial hot water should be defined as the middle section of solar thermal utilization". It should be affirmed that in this "thermal cycle" of 70 degrees Celsius hot water, is very suitable for industrial temperature with heat. Solar energy is fully capable of producing this temperature of hot water.
Shandong province "industrial green power" project provides the heat storage temperature of 70 degrees centigrade, is based on industrial heat of the middle temperature.
3, the solar energy industry in the middle of the temperature ratio of heat
(1) the broad use of heat in the solar energy industry
Food category: traditional crafts, boiling boiling pot add cold water, hot steam to the heating up to 65 DEG C, a feed.
Chemical coating reaction kettle: first, the cold water of the reaction kettle is heated to 50 DEG C ~70 DEG C for feeding.
Other categories: cloth, leather material, such as desizing, oil removal, are required to 65 degrees Celsius ~70 degrees of hot water.
These industrial processes have to consume a large amount of hot water. The hot water provided by the solar energy section belongs to one time direct heating.
2) the proportion of hot water in the middle section
For example, Zhucheng Jiashibo limited cooking workshop 12m fand chicken skillet, 70 C /4m 44T fand solar hot water before feeding, incarnate meat fand 8m.
Heat absorption in the first stage: the heat released by hot water - 385MJ; after being absorbed by the cold meat, the temperature reached 47 degrees celsius.
The second stage: 4t47 hot water heating to 100 DEG C, the heat consumption of 886MJ, 8t Rice-meat dumplings heating to 100 DEG C to heat 1272MJ. Total consumption: 2158MJ.
Need about 1t150 degrees of steam. Setting up the solar hot water before preheating the boiler. The output of 8t cooked meat balls, solar thermal energy accounted for 38%. Visible, solar energy to provide industrial hot water, technically feasible, energy-saving effect is very significant.