The big chimney caused an accident and the BMW car hit the barrier at high speed
On January 22, when Mr. Li was driving to the Muchengyi Bridge of Shenhai Expressway, he witnessed a traffic accident - a BMW X6 skidded due to the failure of braking, resulting in continuous impact on the separation belt, and the car was seriously damaged. The cause of the accident was that a section of the road about 100 meters long in the bend of the bridge was covered with ice water and was extremely slippery. Why is there ice water on the bridge deck of the expressway? On 23 January, this reporter went to the scene to investigate.
The ground on the side of the highway near the boiler room was covered with snow melter and ice that had not completely melted. Peninsula Morning News, 39 Degrees Video Photojournalist Fan Jiade
Outburst:
The highway bridge deck was icy and caused the BMW to slip and crash into the car
"This situation should be a big safety hazard. These were the first words Mr. Li said to reporters.
On January 22, Dalian suffered another cold wave, and the temperature in various parts of the city reached the coldest level since the beginning of the year, with the highest temperature only about minus 10 degrees Celsius, accompanied by northerly winds above level 7. The safety hazard Mr. Li said was related to the severe cold, and the location was on the G15 Shenhai Expressway.
Mr. Li is a truck driver who drives trucks on the Shenhai Expressway all year round, going back and forth between the city and Lushun. At about 9 o'clock on January 22, he drove to Lushun as usual, and when he passed the Muchengyi Bridge of Shenhai Expressway, he almost encountered a traffic accident. "As soon as I turned into the bend of the Makijoyi Bridge, I saw that the road ahead was shiny and reflective, and it was all ice. Mr. Li was shocked at the time, but because he had been walking this road for many years and had enough driving experience, he quickly controlled the truck, gradually slowed down, and passed the icy road without danger.
However, a BMW driving in front of Mr. Li was not so lucky. "The BMW X6 should have failed to brake and slid sideways on the ice, causing it to hit the isolation belts on both sides back and forth, and the damage was very serious. The front and rear of the car were shattered, and parts were scattered all over the ground. Mr. Li told reporters, "Fortunately, the car is sturdy, I saw that people got out of the car, and they should not be injured." "If it's a big truck that slips on the ice and hits the barrier, it's over. Because of the weight of the truck and the low height of the barrier, it is likely that a high-speed truck will break out of the barrier and fall off the bridge. Mr. Li said with palpitations that the Muchengyi Bridge is more than ten meters above the ground, and once a car falls, the consequences are unimaginable.
But why does the bridge on the highway freeze and where does the water vapor come from?
Incentive:
Water vapor is emitted from the chimney of the heating company's boiler room
Muchengyi Bridge is located in the Yingchengzi section of Shenhai Expressway, there is a bend in the middle of the bridge, the north side of the bend is a boiler room of a heating company, the boiler room has a large chimney, and it is dozens of meters away from the bridge deck. It was a harsh winter, and the boiler room was burning day and night, and a large amount of smoke was discharged along the chimney and drifted along the north wind to the high-speed bridge deck on the south side.
The highway guardrails are covered with blackened ice.
"There is a lot of moisture in the smoke coming out of the big chimney. This water vapor condenses into water droplets at low temperatures, which freeze when they fall on the bridge deck. After a long period of observation, Mr. Li came to this conclusion. "This boiler room has been around for many years, and as soon as it starts in winter, there is either water or ice on the bend of the bridge deck. He continued. This winter has seen a lot of severe cold weather, especially the days when the bridge deck is frozen. As a result, in this bend of the Muchengyi Bridge, there is an icy road about 100 meters long from time to time, covering multiple lanes. This slippery and icy road has become a safety hazard in Mr. Li's eyes, threatening the safety of driving on the Shenhai Expressway. "Every time I walk over icy roads, I have to be careful. Mr. Li told reporters that if the driver is not familiar with the road section, especially the driver of the car from other places, he will not have time to react when he turns the corner and sees that the road is full of ice. "Many drivers will subconsciously step on the brakes, and when they step on the brakes on the ice, they will definitely slide sideways and cause traffic accidents. If the car behind is too late to avoid it, it can have a more serious impact. After all, it's a highway, and vehicles are driving at high speeds. He said.
Ice cubes hung on the roof and windows of the boiler house.
At about 2 p.m. that day, when Mr. Li drove his truck back to the city from Lushun, he saw that the driveway back to the city was also covered with broken ice.
So, is the actual situation as Mr. Li said? The reporter decided to go to the scene to investigate.
Survey:
The site has been de-iced and 3 cm thick ice is still visible on the side of the road
On January 23, the daytime temperature in Dalian city rose one after another, with the highest temperature of minus 3 degrees Celsius and a northerly wind of more than 5 degrees. At about 3 o'clock in the afternoon, according to the map positioning provided by Mr. Li, the reporter drove from the toll station of Zhoushuizi Airport in Ganjingzi District to the G15 Shenhai Expressway and headed for Lushun.
After driving into the Shenhai Expressway, the first ten kilometers were very smooth, and there was nothing unusual on the road. It wasn't until he crossed the Yingchengzi toll station and drove up the Muchengyi Bridge that the reporter saw a big chimney in the distance being smoking, and the smoke was over the bridge. The reporter had a premonition that he was about to arrive at the icy section of the road and began to gradually reduce his speed, but until the reporter's car drove into the bend of the Muchengyi Bridge, he still did not see anything unusual on the road ahead. Just as the reporter was about to drive out of the curve, he suddenly saw a shiny reflection on the road 100 meters ahead, and a row of traffic cones were placed on the emergency lane. The reporter realized that the icy section of the road was almost there.
At that time, the ice on the roadway of this section of the road had basically melted, and from time to time, water stains stirred up by high-speed vehicles reminded reporters that there was still a lot of water left on the road. On the emergency lane, there are a lot of coarse snow melting agents and ice cubes that have not completely melted, and some ice cubes can be about 3 cm thick. The guardrails of the bridge's barrier are covered with blackened ice, and some of them have ice skates hanging from underneath them. The bridge is more than ten meters above the ground, and the boiler room compound of the heating company is under the bridge. The chimney on the roof of the boiler room is about thirty or fifty meters away from the bridge, the chimney is slightly higher than the bridge deck, and the chimney and the roof of the boiler room are covered with gray-black ice, and the white smoke from the chimney is drifting towards the bridge in the north wind.
Standing beneath the white smoke on the bridge deck, the reporter could feel the thin droplets of water falling on the reporter's face and body. At this point, it can be basically determined that there is a causal relationship between the icing of the bridge pavement and the smoke exhaust in the boiler room. The affected section of the road is about 100 meters long.
So, why does the flue gas in the boiler room contain a large amount of water vapor, and does the heating company know about the potential safety hazards?
The heating company involved:
The water vapor desulfurization process is backward, and the boiler room is about to be relocated
Subsequently, the reporter drove away from the Shenhai Expressway and came to the compound of the boiler room involved.
In the courtyard, the first thing that caught the reporter's eye was a huge coal pile, and the black coal pile was covered by a layer of black ice. The entire courtyard was covered with gray-black ice ballast, and near the bridge, there was crushed ice falling from the bridge. There was a rumble in the boiler room, and two workers were shoveling coal for the furnace. In the duty area upstairs of the boiler room, a duty officer told reporters that the boiler room belongs to Dalian Blue Sky Heating Co., Ltd. "There is water vapor in the smoke, which is for the sake of environmental protection – to alleviate pollution such as particulate matter, sulphur dioxide, etc. He said.
The next day, the reporter interviewed Dalian Blue Sky Heating Co., Ltd. by phone. "This boiler room will be moved out at the end of this heating season, and there are more than 60 days left. The new address has been chosen and is being built. Mr. Tang, the head of the company, told reporters. He had already learned that a large amount of water vapor emitted from the chimney of the boiler room had caused the Shenhai Expressway to freeze, and that a traffic accident had occurred on the Muchengyi Bridge on January 22. The company has already studied a temporary solution for this, and will start implementing it after Mr. Tang returns to Dalian from a business trip. "I'm going to build a shelf on the chimney and make a net to cover it to stop the water vapor from drifting to the bridge. Will definitely take care of it. "He showed his determination.
Mr. Tang's explanation for this is that the boiler room was built around 2007, using old-fashioned equipment, and the desulfurization process is immature. "The water and dust are not well treated by the water and dust desulfurization. The original purpose was to clean the flue gas to meet the environmental emission standards, but the result was that the water vapor was increased. He said that when he moved to the new site and installed the new equipment, there would be no water vapor problem.
Can the temporary solution researched by the Blue Sky Heating Co., Ltd. be effective? Can the hidden safety hazards on the Muchengyi Bridge be removed? This newspaper will continue to pay attention.
Peninsula Morning News, 39 degrees video reporter Zhuo Zeyu
(Informant: Mr. Li; clue fee: 100 yuan)
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