On the afternoon of August 11, a high-pressure steam pipeline explosion occurred during the construction and debugging process of the thermoelectric project of Madian Ganoderma Power Generation Co., Ltd. in Dangyang, Hubei Province, resulting in 21 deaths and 5 injuries. After investigation by the State Administration of Safety and Safety, the main cause of the accident was that the weld of the pipeline flowmeter valve was cracked and a large amount of high-temperature and high-pressure steam overflowed, causing the glass of the main control room to rupture, causing serious casualties in the main control room.
The relevant person in charge of Dangyang City said that all the equipment of the company involved has been shut down, and a total of 6 legal persons and related personnel have been controlled by the police. The Serious Crime Team No. 37 (WeChat ID: zhonganzu37) learned that before this, the power plant had safety and environmental risks, similar leakage incidents and exhaust emissions exceeded the standard, and weld cracks were repaired many times.
▲At around 15:20 on August 11, a pipe explosion occurred in the high-pressure steam pipeline of Madian Ganoderma Power Generation Co., Ltd., Dangyang City, Hubei Province. After full efforts to organize search and rescue, 21 people have been confirmed to be killed and 5 people were injured, including 3 seriously injured. At present, the injured have been sent to the hospital for treatment, and the search and rescue at the scene of the accident is underway. Xinhua News Agency reported that
At the time of the incident, the near 600℃
pipeline rupture was located in a factory building of more than 1,000 square meters in the middle of the factory site of Madian Ganodle Power Generation Co., Ltd. (referred to as Madian Power Generation Co., Ltd.). At 11 a.m. yesterday, in a room on the third floor of the factory, which has an area of about 100 square meters, although it has cooled down naturally, it is still in a hot and hot state.
On-site staff told the Serious Crime Team No. 37 (WeChat ID: zhonganzu37) that at the time of the incident, a steam pipeline in the room broke during the debugging process, and the on-site temperature was close to 600℃, resulting in the unfortunate death of 21 people working on the site.
In the core area of the incident, a silver-white high-pressure steam pipeline with a diameter of about 1 meter broke, leaving only a thin dark pipe in the inner layer, and the outer membrane and filler of the pipeline were completely damaged. Debris of the outer membrane of the pipe can be seen everywhere on the ground, and the metal outer membrane that can withstand heavy pressure has been deformed by the explosion and impact.
is adjacent to the scene of the incident. It is separated by a large window. It is impacted by an explosion and only the frame is left. Glass fragments and twisted metal strips were seen everywhere on the scene, and the tables and chairs that had fallen out were tilted, making a mess.
▲The accident scene on the morning of August 12. Photo by Lin Feiran, Beijing News reporter
The legal person involved was controlled
August 12, the Serious Crime Team No. 37 (WeChat ID: zhonganzu37) learned from the Dangyang Municipal Party Committee Propaganda Department that after the incident, all equipment of the Madian Power Generation Company involved had been shut down, and surrounding enterprises were also shut down. The public security department strictly controlled and warned the scene and carried out a good job in protecting the accident site. The working group of the State Administration of Safety and Safety arrived in Dangyang yesterday morning to guide the accident handling work on site.
Dangyang City Executive Vice Mayor Li Xiaojun said that the legal person of Madian Stone Power Generation Co., Ltd. has been controlled, and a total of 6 relevant personnel are under investigation by the Dangyang City Public Security Bureau.
Serious Crime Team No. 37 (WeChat ID: zhonganzu37) learned that the power plant had previously encountered safety and environmental risks, similar leakage incidents, as well as excessive exhaust emissions and repairs of multiple weld cracks.
▲The accident scene on the morning of August 12. Beijing News reporter Lin Feiran photographed
Focus
What is the reason for the high-pressure steam pipeline rupture?
A employee of the power plant introduced to the Crime Team No. 37 (WeChat ID: zhonganzu37) that the explosion site is located in a five-story factory building, more than 80 meters long and more than 30 meters wide. Pipelines shaped like beacon towers on each floor are arranged on each floor. There are two large generators on the first floor and three huge boilers behind the house.
Steam leakage point is located on the center console on the third floor, about 20 meters long, and is separated by double-glazed glass from the center console. The pipe diameter is 426mm, and the outer layer is covered with white insulation cotton with a thickness of about 300mm. "As soon as you get close, you will get hot all over. If you stand for two minutes, you will sweat heavily. If you need to go outside to take a breath in less than 10 minutes."
In the eyes of workers, even a small hole of steam leaks can be fatal. "Like a needle, high temperature can pierce the body.”
According to the State Administration of Safety, after preliminary investigation and analysis, the main cause of the accident was that the weld of the main pipeline flowmeter valve at the steam outlet of the No. 2 boiler was cracked, and a large amount of high-temperature and high-pressure steam overflowed, causing the glass of the main control room to rupture, causing serious casualties in the main control room. The detailed cause of the accident is under further investigation.
Cai Guoxiong, deputy chief engineer of the China Electric Power Science Research Institute of State Grid, introduced that the steam pipeline that occurred in the accident is the standard configuration of thermal power plants. Generally, coal and gangue are mixed and burned. When the boiler is finished, steam will be generated, and steam will be used to push the steam turbine. There is a distance between the boiler and the steam turbine. The accident happened this part of the pipe that transports high-temperature and high-pressure steam.
The welding position of the pipeline is weaker than other parts in strength. Problems may occur with poor welding quality, or cracking gradually occurs in the weld during long-term operation. Therefore, it is particularly important to inspect the welding site on weekdays. Generally speaking, ultrasonic identification of the quality of the weld should be carried out after welding, and each weld must be safe. "Once the instantaneous steam flow increases, the boiler pressure and temperature increase, it may cause cracking of the weld."
From a spatial perspective, steam at high temperature and high pressure instantly sprays out hundreds of degrees Celsius will produce a huge impact force. "The steam itself is not toxic, but the temperature is very high and the pressure is very high. The factory is closed and will break the buildings and windows, and people will be pushed down at once, causing scalding. In fact, the main control room does not require too many operating personnel, but if it was being debugged at the time, it is possible that the installation and debugging personnel were on site, causing major casualties. "
▲The accident scene was filmed on August 11. Xinhua News Agency released
What is the aftermath of the death of the accident and the treatment of the injured?
At the door of the intensive care unit of Dangyang People's Hospital, the brother-in-law of the injured Huang Hualin did not sleep all night. He introduced that 48-year-old Huang Hualin is the "old veteran" of the power plant. He entered the factory more than 10 years ago when he was building a factory in Madian Village and was also sent to Jiangxi to learn management equipment.
On the day of the incident, Huang Hualin was on a day shift and had to get off work in more than 2 hours. However, the accident happened His burn area reached 80%. "The whole body is black, his eyes cannot be opened, his hands are blisters, gauze is wrapped around his legs, and he can't speak."
24-year-old Luo Wen is the most serious burn among the five injured in this accident.
90% of his body are burned. The doctor told his family that Luo Wen is still conscious and has reactions when calling his name. His eyes can be opened and his eyes are swollen.
Luo Wen only works in the power plant for two months and is responsible for taking care of the instruments. He has worked in a fertilizer factory before. According to the family, Luo Wen is a little far from the explosion pipeline, so he is just injured.
Dangyang City Chang Vice Mayor Li Xiaojun said that after the accident, Yichang City and Dangyang City both launched emergency plans. The local public security, health and medical departments rushed to the scene as soon as possible. Firefighters entered the scene many times. A total of 21 bodies were found in the accident, and all sent to the funeral home. A list of victims of this safety accident obtained by
Serious Crime Team No. 37 (WeChat ID: zhonganzu37) showed that the deceased and injured were from Dangyang, both of whom were employees of Madian Power Generation Company, and they all handled "five insurances and one fund" and came from Dangyang Baling Office, Yuyang Office, Wangdian Town, Lianghe Town and other townships. The youngest among the victims was 22 years old and is currently comparing D NA, further verify the identity of the victims. On the evening of August 12, the agent learned that all the identity of the victims were verified.
, Gong Xuan, director of Dangyang Municipal Health and Family Planning Bureau, introduced that after the accident, five injured were sent to Dangyang People's Hospital, three of whom were seriously injured, 90% of them were burned, and they had coma and shock at one time. After consultation by experts from Wuhan Tongji Hospital, Wuhan Third Hospital, and Yichang Municipal Hospital, their vital signs were basically stable. At present, the relevant departments are mobilizing helicopters and transferring the four injured to Wuhan Third Hospital for further treatment.
▲On the afternoon of August 12, the injured in the transfer accident was transported.Photo by Lin Feiran, Beijing News reporter
Is there a serious safety hazard in the power plant involved? A villager near
introduced to the Serious Crime Team No. 37 (WeChat ID: zhonganzu37) that the site of the Madian Power Generation Company was originally a hillside. In October last year, the power plant moved from Madian Village and pushed the hillside of Group 3 of Hefan Village to build a factory.
Industrial and commercial data shows that the company was established in 2002 with a registered capital of 100 million yuan. Its business scope includes thermal power generation, slag and ash sales, coal purchase and sales, ethanol gasoline, kerosene, diesel, lubricant retail, etc.
According to the State Administration of Safety, the company was jointly funded by Huaqiang Chemical Group (accounting for 67% of the shares) and Madian Garrot Power Plant (accounting for 33% of the shares). Its cogeneration project was approved by the Hubei Provincial Development and Reform Commission in December 2012 and started construction in January 2015.
high-pressure steam pipeline installation is constructed by Yueyang Zhusheng Installation Co., Ltd., and the installation of the main equipment is completed in May this year. The debugging conditions are met. Equipment debugging has been carried out since mid-June.
The official website of the Hubei Provincial Development and Reform Commission shows that the company's coal gangue cogeneration project has a total installed capacity of 25MW, and the construction content is 4 220t/h high-temperature and high-pressure circulating fluidized bed boilers (three openings and one preparation), equipped with a 12.5MW backpressure steam turbine generator set and a 12.5MW steam extraction backpressure steam turbine generator set. The company is responsible for raising funds for investment, construction, operation and management.
In 2015, the Provincial Development and Reform Commission issued another notice, agreeing that the power generated by the project was self-employed by Huaqiang Chemical Group and the remaining amount was surfed online.
In August this year, the Three Gorges Evening News reported that after the coal gangue cogeneration project was put into production, it achieved "heat-based electricity and energy cascade utilization" to achieve centralized heating and gas supply for enterprises in the industrial park, and also solved the problem of land occupation and environmental pollution in the park due to coal gangue and gas-making slag storage and storage. It can consume 2.3 million tons of coal gangue and 420,000 tons of gas-making furnace slag each year, save 480,000 tons of standard coal, with an average annual power supply of 70 million kWh and an average annual heat supply of 18 million GCO.
However, the Serious Crime Team No. 37 (WeChat ID: zhonganzu37) found on the official website of the Hubei Provincial Department of Environmental Protection that in the environmental impact assessment report submitted by Madian Power Generation Company in 2012, it pointed out its main environmental risks, including fires and explosions encountered in the fire source after the oil tank leak; various storage tank leak accidents. The company also experienced excessive exhaust emissions last year and was investigated and dealt with by the Dangyang Municipal Environmental Protection Bureau.
For power generation projects, several relevant personnel of the company said there were violations. A contractor said that the pipeline repairs and repairs are common. "If there is a leak, first peel off the insulation cotton and weld it, and then reinstall it. The insulation cotton of about two meters will need to be installed for 2 hours, and the machine is still running during this period."
A dispatcher of a power plant said that some steam was transported to Huaqiang Industrial Company through pipelines. There was a serious leakage this year, but fortunately no casualties.
▲On August 11, the families of the injured person in the accident were waiting at the door of the ICU ward of Dangyang People's Hospital, Hubei Province. Xinhua News Agency
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