Maintenance of water heating
Thread Content
In order to save energy and reduce consumption, most of the pipeline heat tracing in our plant (refinery) has been changed from steam to hot water. Please actively participate in the discussion.: 1. Maintenance points of water tracing, 2. Which media cannot be changed to water tracing, 3. How much temperature and pressure control of water tracing supply water is appropriate, 4. What are the requirements for the diameter of the water tracing return water bus, 5. The length of a single water tracing should not exceed how many meters.
Water heating is a relatively mature project with significant energy-saving effects. It uses low-temperature waste heat such as sewage to replace high-temperature steam. The maintenance of water heating during use is mainly reflected on the circulation pump. Secondly, the water quality must be ensured to be clean and not contain many impurities to avoid clogging the pipeline. After all, it does not have a condensation point like steam, so it is difficult to find if it is clogged. Key pipelines in the device cannot be heated with water, such as the oil slurry throw-off line of the catalytic device and other device lifelines. The water temperature of water tracing should ensure that the medium in the pipeline does not condense or crystallize at the heating temperature. As for pressure and temperature, there are no very strict requirements. The diameter of the return pipe should be such that it eliminates maximum pipeline friction. The length of water heating must be calculated in detail and cannot be generalized.
Water tracing maintenance is very small, just keep an eye on the circulation pump. Heavy oil should not be heated with water. The temperature of the water tracing supply water is about 90 degrees, and the pressure is not less than 0.5MPa. The total return water pipe diameter is determined according to the design and there are no special requirements. Single water heating is calculated based on the pressure drop, and specific calculations are required. Generally, a horizontal straight pipe of 150 meters is no problem.
The medium temperature is high and will not freeze even if it loses temperature. Just a little smaller than hot.
It is probably no problem to consider 150 meters in terms of pressure drop, but I think heat loss still needs to be considered. We generally consider about 60 meters.
Water heating is a good way to save energy. I don’t know if it is practical. Please introduce a company and we can learn from it.* .
I think it is not suitable for cold northern regions.
Water quality is the most important, otherwise scale will easily form and block the pipes, making cleaning difficult. Add water quality stabilizer, high temperature water scale inhibitor, etc.