news

한어Русский языкEnglishFrançaisIndonesianSanskrit日本語DeutschPortuguêsΕλληνικάespañolItalianoSuomalainenLatina

"we can't catch it all, we can't catch it all at all"! recently, the zheneng jiaxing power plant located in pinghu city, jiaxing, zhejiang province was attacked by a large number of jellyfish, causing the machines to trip frequently. employees were "fighting wits and courage" with the jellyfish every day and staged a "pump room defense battle."causewhat is the cause of this jellyfish tide? why do jellyfish tides have such a big impact on power plants? what other potential impacts does the “jellyfish crisis” have?

zhejiang energy jiaxing power plant is inundated with jellyfish

employees have caught 210,000 kilograms

zheneng jiaxing power plant is located in liuli bay on the north bank of the qiantang river in pinghu city, jiaxing, zhejiang, facing hangzhou bay in the southeast. it is the largest coal-fired power plant in east china and the second largest coal-fired power plant in the country.

zheneng jiaxing power plant has been attacked by a large number of jellyfish recently. the no. 2 circulating pump room of the power plant is the hardest hit area.the main task of the 30 workers on site every day is to catch jellyfish.

the circulation pump room of the power plant is built on the seaside, and its function is to pump seawater to cool the generator set. the large outbreak of jellyfish made it difficult for the self-cleaning system of the circulating pump room to cope. in order to prevent the cooling water from clogging, workers had to work in three shifts and catch jellyfish in front of the rotating filter 24 hours a day.

regarding the flooding of jellyfish, xi chao, the head of the power plant maintenance department, said that caojing power plant and lingang power plant in shanghai experienced jellyfish flooding in august. we have long heard of the high jellyfish production this year, but the scale was so large that no one expected it. .

"on september 18, typhoon bebigat had already left. at four or five o'clock in the morning, the shift supervisor called me and said that two rotary filters had tripped. i thought it was a normal problem, so i urgently repaired and replaced it. it fell off. at about six o'clock, the third rotary filter also tripped, and i felt something was wrong at that time.

the jellyfish tide continued to hit, and the 14 circulating pump units occasionally tripped due to overload, forcing maintenance workers to stay overnight.

sun chunwei, a specialist in the maintenance department of zhejiang zheneng jiahua power generation co., ltd.:we have been repairing and walking an average of 20,000 steps a day. i stayed up all night for three days and basically never stopped. once the filter is blocked, the circulation pump will stop running, eventually causing the unit to stop running.

xi chao said that the jellyfish tide has put considerable pressure on the normal operation of power plant equipment: "our units must first be forced down to generate electricity. for example, if it can generate 1 million kilowatt hours of electricity, it can only be lowered by 500,000 kilowatt hours."

from september 18th to september 25th,the power plant has caught a total of about 5,250 bags and 210,000 kilograms of jellyfish.

fishermen have been organized to go to the beach to carry out fishing operations

jellyfish numbers are declining

in the past few days, the power plant's jellyfish cleaning personnel have been working in three shifts. every day, as few as four to five hundred bags of jellyfish, and as many as thousands of bags of jellyfish are cleaned out of the factory. at the worst point, bags of jellyfish packed all morning covered the floor of the computer room, and a forklift had to be brought in to transport them away.

xi chao said that after the jellyfish were fished out, they would become rancid after being stored for a short time, so they could only clean them up with kitchen waste. because the quantity is so large, the local sanitation station cannot accept it.

what worries xi chao and his colleagues the most is that the jellyfish coming in are of mixed varieties. they can't tell which ones are edible and which ones are not, and they dare not let people take them away easily. "this is the first time we have encountered this situation in the 30 years since we established the plant. our power plant alone may not be able to solve the problem, so we have sought help from outside."

△on the afternoon of september 27, fishermen carried out fishing operations.

qi zhengwang, chief of the marine management section of the pinghu municipal natural resources and planning bureau, said that pinghu city has organized fishermen to go to the beach to carry out fishing operations:

the first is to increase the number of ships and temporarily block the entry of jellyfish into the water intake. there are already 5 ships on the scene.

the second is to have a third party issue a plan to build an enclosure and use a dragnet to keep the jellyfish out of the water intake.

at the same time, the natural resources and planning bureau of pinghu city, zhejiang province commissioned the east china sea monitoring center to conduct inspections and conduct on-site inspections of localized jellyfish outbreaks.

on the evening of september 27, staff at zhejiang jiaxing power plant reported that monitoring data from the east china sea monitoring center showed that the number of jellyfish had been reduced, and fishing boats were also working.

expert: jellyfish outbreak may be related to environmental changes

power generation companies can take some protective measures in advance

xu kaida, an expert from zhejiang ocean university, believes that,the large-scale reproduction of jellyfish may have a lot to do with environmental changes."generally, compared with last year, the ocean temperature has increased this year. jellyfish grow and develop at the turn of spring and summer, and this year's temperature is suitable for their growth and development."

tian kuo, a lecturer at the fisheries college of zhejiang ocean university, believes that,climate change, ocean acidification, seawater eutrophication and other factors can lead to jellyfish outbreaks."as far as the east china sea is concerned, water temperature and salinity are the main factors driving the jellyfish outbreak. coupled with the agitation of several typhoons some time ago, the amount of plankton increased, which also induced a concentrated outbreak of jellyfish in this area."

xu kaida said that the annual proliferation and release may also cause the number of jellyfish to surge in a certain year.

xu kaida:hangzhou bay releases jellyfish seedlings every year for more than 10 years. after some jellyfish grow up in the sea, they will be caught by fishermen, and some jellyfish will leave their broodstock in the sea to reproduce the next generation. the cumulative effect of long-term releases is also one reason why there are more jellyfish this year.

what are the effects of massive jellyfish reproduction? xu kaida believes that this year's situation has a certain degree of chance and requires long-term monitoring. "we monitor for 2 to 3 years to see what impact it has on the ecology, such as whether there are fewer other fish species and the ecological chain is unbalanced. at present, , no big problems were found.”

xu kaida suggested that thermal power or nuclear power generation companies can entrust relevant professional departments to carry out monitoring and early warning work in advance, and it is necessary to make predictions and take some protective measures.