Reward: Are there any examples in China of high and low temperature heat transfer oils being supplied by a thermal coal furnace?
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A problem was encountered in the design: the temperature of the hot oil at high temperatures is close to 300 degrees, with a heat load of 1 to 2 million kilocalories per hour; whereas the temperature of the hot oil at low temperatures is 220 degrees, with a heat load of 10 to 12 million kilocalories per hour. The heating capacity provided by the hot oil at high temperatures varies within a range of 10 to 20% of that provided by the hot oil at low temperatures. In theory, one furnace could be used for heating. Are there any existing operational examples of this approach in China? Those who give accurate answers will be rewarded with wealth and charm. This post was last edited by 1681818 on 2008-1-6 at 09:45.]
Reward: Are there any examples in China of high and low temperature heat transfer oils being supplied by a thermal coal furnace? Those who give accurate answers will be rewarded with wealth and charm.
I designed a project like this 1 year ago. The system is working well at present. My solution is to divide the heat medium into two systems: a primary heat medium system and a secondary heat medium system, with both being independent closed-loop circulation systems. In one case, the heat source for the heat transfer medium system comes directly from the heat transfer medium boiler. As one of the users in the secondary heat medium system, a heat exchanger is used to transfer heat to this system; in other words, the heat source for the secondary heat medium system is the primary heat medium. This method is simple, practical, and easy to control. But an additional heat exchanger was added. For reference. :)
No heat exchanger is needed; just a mixing container is sufficient. That’s how it works in our factory – there are two circulation systems, along with a mixer in between to control the temperature
I personally support the plan for the fourth floor! This is the principle used for temperature control in coal-fired heat transfer oil heaters. High-temperature heat transfer oil and low-temperature heat transfer oil are mixed in proportion to produce heat transfer oil at the desired temperature, which is then pumped to the main workshop. There’s no problem at all. It should be noted that the reliability of instruments is very important, especially for mass flow meters.
I remember that mixing high and low temperatures seems to be a method with very low energy efficiency. It seems that the “exergy” value is very low. Hehe.
I wonder if the original poster has ever tried that kind of mandarin duck hot pot, or hot pots with inner and outer sections or a shape similar to an eight-trigram pattern – ones where the containers are separated. A similar design involves oils at different temperatures layered together, with heating elements of varying power levels, which would meet the original poster’s requirements
This post was last edited by gzlzhx on 2012-9-25 at 13:28. I have seen a case where there are two heat transfer systems; the heat transfer medium is divided into a primary heat transfer system and a secondary heat transfer system, with both systems being independent closed-loop circulation systems. In one instance, the heat source for the heat transfer medium system comes directly from the heat transfer medium boiler, with a capacity of around 10 million BTU. The secondary heat medium system is installed at the outlet of the heat medium boiler, with a capacity of around 2 million Btu; it actually functions as a waste heat recovery device. The insufficient heat is provided by the primary heat medium, which also serves as one of the users of the primary heat medium system. A heat exchanger is used to transfer heat to the secondary heat medium system, meaning that the heat source for the secondary heat medium system is the primary heat medium. This method results in a low flue gas temperature in the boiler, high efficiency, is simple and practical, and easy to control. An additional heat exchanger and a waste heat recovery unit have been added; the loss of \"exergy\" is low, making the system highly efficient