How to perform a physical examination on the heat exchanger station-circulating pump
To treat a plate heat exchanger station is just like to cure the disease of a person, there is no miracle drug in the world that can guarantee to cure all diseases, every plate heat exchanger station has different body mass and different conditions, so one therapeutic schedule cannot treat all the plate heat exchanger stations, the stations need to be examined meticulously detail by detail to suit the remedy to the case.
Physical examination on the plate heat exchanger station is much simpler than that on human beings, the examination items are no more than temperature, flow, pressure, power and several key points, through these simple parameters, 3 important indicators of heat rate, power consumption and pressure drop were examined, so as to find the crux of the problem of “three highs” of the plate heat exchanger station. Let us see the high-end customized health care services that heating stations can enjoy:
First item of the physical examination: cardiac function examination - circulating pump health state
The circulating pump is a key equipment for transmission and distribution of the plate heat exchanger station, and its health state directly affects the heat supply effect and operating cost of the plate heat exchanger station. The efficiency of the water pump is an important indicator to measure whether the model selection of the plate heat exchanger station is reasonable and whether the operation is economical.
At present, most of the water pumps operated in some thermal companies are rather big in model selection, low in efficiency and need to be removed and replaced. Why? Isn't that a waste removing water pumps of the just finished plate heat exchanger station? In fact, it is not a waste, to continue the use is the biggest waste. What we need to do is to let the efficiency of the water pump fit the existing operating conditions and be close to the optimum efficiency as far as possible by examinations and measurement. The optimization of water pump efficiency is one of the most reliable ways to reduce power consumption for heat-supply enterprises, because inefficient pumps seem not to affect the current operation, but they actually waste a lot of energy and operating costs.
Here is another misunderstanding, that is, overthrowing the original model selection, directly reducing the lift and replacing large pumps with small ones will be okay. This is definitely wrong, because the plate heat exchanger intra-station systems are roughly the same, but every plate heat exchanger station has a different anfractuous courtyard heating pipe network, reselecting the model of the circulating pump before the courtyard heating pipe network is adjusted to balance will still lead to low efficiency and high power consumption. This is also the primary cause of large and unreasonable model selection of the water pump in design, as well as a common problem in heat-supply enterprises.
Most water pumps operate in a low efficiency range for long term. If this is the case, replacing the pump as soon as possible is the best choice.
After the efficiency of existing circulating pumps is examined, through reasonable model selection and replacement, more energy-saving water pumps will significantly reduce the operating cost, earn back the equipment cost for heat-supply enterprises in a few months, benefit the enterprises for long term, and achieve the optimum energy-saving effect, even the electric charge saved in one heating period can be enough to buy several water pumps.
Examination method: water pump efficiency test
