- Issue Time
- Aug 16,2017
Status of thermal energy in solar engineering industry. As we all know, China's energy has three major networks: offshore oil, land and gas pipelines, ultra high voltage power grid. Now another new energy network is emerging, the new distributed energy grid". The distributed new energy network includes distributed solar thermal and distributed solar photovoltaic. The industrial energy consumption in China is hot water, hot steam and two electricity. With the help of enterprises' workshop roofs and industrial squares, new distributed energy sources can be used.
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 heat source of industrial product manufacturing industry. China's industrial manufacturing has a characteristic, almost all the production process using hot steam, hot steam output equipment, almost all coal boilers. It can be seen that solar energy heating and industrial heat have positive utilization characteristics.
2 solar industrial hot water and solar hot water
Hot water and hot steam are the two major media for industrial heat. In most cases, hot water is a hot medium at the end. Hot steam is a source of process temperature and a consumable.
Industrial production heat, from the process temperature, the temperature range is relatively large; from low temperature hot water, high temperature hot water until the steam. The actual industrial heat is a thermal ring of hot water to hot steam". Industrial solar energy utilization is synchronized to this "thermal ring", the specific form is to complete a hot water from low temperature to high temperature hot water, until the production of high temperature steam heat ring". Completed the thermal cycle, even if achieved the highest stage of industrial solar energy utilization. Industrial hot water should be defined as the middle section of solar thermal utilization". It should be sure that the hot water at about 70 degrees in this "heat ring" is very suitable for heating in the middle of the industry. Solar energy can completely produce the hot water at this temperature.
Shandong industrial green power project stipulates that the heat storage temperature is 70 degrees, which is based on the middle temperature of industrial heat.
3. The ratio of heat to temperature in the middle of solar energy industry
1) the broadness of heat used in the solar 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 reactor: also the first reactor to the cold water heating up to 50 degrees ~70 DEG C, feeding.
Other types: cloth, leather class of desizing, deoiling, all need 65 ~70 C hot water.
All of these industrial processes consume a lot of hot water at one time. Solar energy provides hot water at this temperature range, which belongs to a single 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.
The first stage of heat absorption: hot water release heat - 385MJ; after cold meat absorption, the temperature reached 47 degrees of thermal equilibrium state.
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.
It takes about 1t150 degrees of steam. Set up boiler pre heater with solar hot water. 8t cooked meat pills, solar thermal energy saving accounted for 38%. It can be seen that solar energy provides industrial hot water, the process is feasible, and the energy-saving effect is remarkable.