One or three questions: Why does the high-pressure steam pipeline leak?

How to blast the commissioning project of power plant;

"It's loud." At 3 o'clock in the afternoon on August 1 1, Du Qiuxin, a villager from He Fan Village of Baling Office in dangyang city, was taking a nap at home when he suddenly heard a loud bang. Soon after, a warning line was set up around Madian Coal Gangue Power Generation Co., Ltd. in dangyang city, Hubei Province, and fire engines and ambulances entered the factory intensively. At 7 o'clock that night, I saw at the scene that dozens of cars were parked by flashing warning lights and the road leading to the factory was blocked. There are nearly 100 people around the peripheral road. An employee of the nearby Huaqiang Chemical Plant said that the plant was newly built by Huaqiang Chemical and other companies. Due to the shortage of workers who just started production, he was supposed to be transferred, but he ran away because he didn't go there for something. According to local information, as of 20: 00 p.m.1min, 2 1 person was killed and 5 people were injured, including 3 seriously injured, in the thermoelectric project accident of Madian Coal Gangue Power Generation Co., Ltd. in dangyang city, Hubei Province.

2. How did the high-pressure steam pipeline leak?

After the accident, the State Administration of Work Safety immediately sent a working group to the scene of the accident to guide and assist the local authorities in on-site rescue and accident handling. Huang Chuping, member of the Standing Committee of Hubei Provincial Party Committee and secretary of Yichang Municipal Party Committee, and Ma Xu, mayor of Yichang, led the responsible comrades of the city and the departments of safety supervision, letter, quality supervision and health planning of the city to the scene to guide the disposal work at the first time. The local government has also set up a special work class to actively and properly appease the families of the casualties. Li Hongzhong, Wang Xiaodong and Fu Dehui, leaders of Hubei Province, rushed to the scene from Wuhan to inspect the scene of the accident and study and deploy the accident treatment and aftermath. According to the personnel who entered the scene afterwards, the accident site was located in a thermoelectric project workshop of Madian Coal Gangue Power Generation Co., Ltd. in dangyang city, Hubei Province. In a room of several hundred square meters, the main console and the high-pressure steam pipeline are in the same space. The scene picture shows that the monitoring frequency of the general control platform was almost completely shattered by steam leakage, and the lamps, tables, chairs and pieces of paper in the workshop were scattered all over the place, and the scene was a mess. According to the preliminary investigation, the accident was caused by the rupture of high-pressure steam pipeline and steam leakage during the construction and commissioning of the thermoelectric project of dangyang city Madian Coal Gangue Power Generation Co., Ltd.

3. How is the aftermath done?

An attending physician in the intensive care unit of dangyang city People's Hospital revealed that there were many seriously injured people in the intensive care unit. He whispered about the treatment to a family member, who looked dignified. A nurse in charge of the intensive care unit said that in the intensive care unit, two people may be in danger. Some injured people have internal organs injuries and have problems with breathing and heartbeat. An injured person worked in Huaqiang Chemical for 9 years and just transferred to a new factory for more than a month. According to his uncle, after the accident, he was rushed to the intensive care unit of dangyang city People's Hospital for rescue. At present, all the wounded have been sent to the hospital for treatment, and the engineering equipment has been shut down. Local special classes have been set up to actively and properly appease the families of the casualties.

Second, the pressure pipeline safety operation knowledge

The principle of coal gangue power plant is the same as that of general thermal power plant, which uses the heat generated by coal gangue combustion to heat the boiler to generate high-pressure steam to drive the steam turbine, and the steam turbine and the generator are on the same shaft, thus driving the generator to generate electricity. Between the boiler and the steam turbine, there is a high-pressure steam pipeline connecting them, which is the pipeline of this explosion. High-pressure steam pipes may explode due to unstable or aging welded joints. The water vapor in the steam pipe is generally 500 to 600 degrees Celsius. "Once it explodes, it will instantly fill a large area, and the equipment and personnel inside are in danger." Steam pipeline is not the core of power plant, but it is the "lifeline" connecting boiler and steam turbine and the power source of generator, so it is very important. The daily maintenance of pressure pipeline is an important basis to ensure and prolong the service life and avoid accidents. Pressure pipeline operators must conscientiously do a good job in daily maintenance of pressure pipelines;

Regularly check the protective measures of pressure pipeline to ensure that it is intact and reduce the corrosion of pipeline surface;

The operating mechanism of the valve should be derusted, oiled and operated regularly to ensure its flexible operation;

Safety valves and pressure gauges should be wiped frequently to ensure their sensitivity and accuracy, and calibrated on time;

Regularly check the integrity of fastening bolts to ensure completeness, no rust, thread and reliable connection;

Pay attention to the vibration of the pipeline. If abnormal vibration is found, vibration reduction measures such as isolating vibration source and strengthening support should be taken. If friction is found, measures should be taken in time.

Electrostatic jumper and grounding device should be kept intact and complete, and should be repaired in time if found damaged;

The stopped pressure pipeline shall be emptied of internal medium, replaced, cleaned and dried, and protected with inert gas if necessary. The external surface should be protected by paint, and the thermal insulation materials of pipes with thermal insulation should be intact;

Check the parts that are easy to corrode and wear, such as the contact between the pipeline and the support, and take measures in time when problems are found;

Eliminate the phenomenon of running, running, dripping and leakage of pipeline system in time;

For high-temperature pipelines, in the process of starting to heat up, it is necessary to heat up the connecting bolts of the pipeline flange; Cooling the low-temperature pipeline in the cooling process;

It is forbidden to use pipes and supports as anchoring points for tools such as welding zero lines and as supporting points for lifting heavy objects.

Cooperate with the pressure pipeline inspector to inspect the pipeline regularly;

Emphasis should be placed on maintenance and inspection of pressure pipelines in important parts of the production process, pipelines crossing roads, bridges, railways, rivers and residential areas, pipelines conveying explosive, toxic and corrosive media, pipelines with poor working conditions and pipelines with alternating loads;

In case of any of the following situations during the operation, emergency measures shall be taken immediately, and relevant management departments and personnel shall be reported in time:

(1) If the medium pressure and temperature exceed the allowable range, the measures are still invalid;

(2) Cracks, bulges, deformations and leaks occur in pipes and components;

(3) The pressure pipeline is blocked by freezing;

(4) Abnormal vibration and noise of pressure pipeline endanger safe operation;

(5) Failure of safety protection device;

(six) the fire accident directly threatens the normal and safe operation;

(7) The valves and monitoring devices of the pressure pipeline fail, endangering the safe operation.