Recently, a tragedy caused by the unregulated use of biogas digesters occurred in Xingfu Village, Longtan Town, Gongjing District, Zigong City. When a villager pumped biogas slurry, he would immediately go down to the bottom of the pool for checking because of motor failure. Unfortunately, the poisoning fainted. While the other three villagers went directly to rescue without taking any protective measures, they continued to faint in the digester, causing all four people to die due to biogas poisoning and manure water blocking the respiratory tract.
How to safely use biogas digesters to prevent similar tragedies from happening again. On May 11, the reporter interviewed Yin Xianzhi, a biogas security expert from the Provincial Rural Energy Office. According to him, because biogas fermentation must be an anaerobic environment, biogas is flammable and explosive gas, there is no oxygen in the pool, a small amount of * hydrogen gas in the biogas can also paralyze nerves, so once a person enters the pool, he can easily lose his consciousness. Asphyxiation causes safety accidents such as casualties.
The first pass: Safety Jianchi Yin Xianzhi explained that in accordance with national regulations and Sichuan Rural Energy Regulations, farm households building biogas digesters should be required to hold professional workers who hold a “biogas production worker†national vocational qualification certificate, and strictly implement “household useâ€. Biogas tank construction operating procedures," and other standards. Biogas tanks should be sited as far as possible to avoid pedestrian passages, landslides, etc. The distance between the pool site and the biogas digester should be controlled within 25 meters, and the biogas tanks should be built in conjunction with livestock and poultry housing and toilets. Human and animal excrement flows into the pool.
Safety helmets should be worn for construction personnel and construction work should be avoided during high temperature hours. Sick construction, fatigue construction, and late night construction are strictly prohibited. During flood season construction, it is necessary to avoid the construction of rain and do a good job of flood control drainage measures. Drainage trenches shall be set around the pond pits, diversion trenches shall be installed at the bottom of the pond, and rainproof sheds shall be erected to prevent the pit from collapsing due to heavy rainfall.
When digging biogas pits, mud should be kept away from pool pits to prevent landslides. During construction, attention should be paid to the safety of buildings on the ground, such as farm houses. After digging pool pits, timely construction is required. Biogas cooking appliances and related products must be installed in a timely manner to dispose of waste pits in a timely manner.
The second pass: Safety gas "The installation and overhaul of biogas pipe fittings and other facilities and equipment should be handled by professionals who hold the "Biogas Production Workers" national vocational qualification certificate, and strictly implement the "Rural Household Biogas Pipeline Construction and Installation Operation Procedures." "And other standards." Yin Xianzhi stressed that the installation of pipelines must not intersect with the wire, gas cookers should be placed on a dedicated stove, away from flammable items. Farmers should carefully read the instructions for use of equipment such as biogas stoves, and close the valves after use. When it is found that switches, pipes, stoves and other leaks, should promptly close the valve, open the doors and windows, prohibit the use of open fire, smoking, switching electrical appliances, and timely maintenance and repair of professional maintenance personnel.
The gas generated during the initial stage of the newly-built biogas digester is exhaust gas and should be discharged outdoors. During discharge, it is forbidden to test the fire at the discharge port and air guide pipe to avoid tempering and cause explosion of the tank body. It is forbidden to put various pesticides and harmful substances into the biogas digesters. It is forbidden for children to play near the biogas digesters and play with fires. It is strictly forbidden to smoke and use open flames beside the biogas digesters. Regular observation of biogas pressure changes, when the control purifier pointer pressure reached 9Kpa, should be timely gas.
To do a daily inspection of the digester pool and supporting facilities, the contents and methods of overhaul are:
One is whether the sealing cover is leaky. If leakage is found, repair it in time to prevent fire or suffocation.
The second is whether the inlet and outlet cover plates are damaged or missing. Once they are found damaged or missing, they must be repaired and replaced in time to prevent people and livestock from falling into the biogas tanks.
Third, whether there is crack on the ground around the digester. Once cracks are found, the cause must be identified and handled in time;
Fourth, the switch, pipe, pipe fittings are leaky, if loose, broken, damaged or aging, repair or replacement in time;
Fifth, whether the pressure gauge or stove body is damaged. Once it is found to be damaged, it must be repaired and replaced in time;
Sixth, whether the desorption agent is saturated or not, if it becomes dark brown, it must be updated in time.
The third pass: Safe discharge and maintenance “This phase is the easiest to have a safety accident.†Yin Xianzhi reminded that non-professionals are prohibited from entering the pool for discharging and overhauling unfilled biogas digesters.
Biogas digesters and large discharges should be handled by professional maintenance personnel. In order to discharge and overhaul the pools, the following requirements must be observed:
First, the biogas digester with movable cover opens the movable cover plate, the biogas digester with no movable cover plate, pulls out the air supply pipe on the air guide pipe or opens the bypass switch, and uses manual or mechanical methods to blow air into the pool to drain the biogas in the pool. After the biogas in the pool is exhausted, the use of live poultry for verification must be carried out in the pool under the premise of ensuring safety;
The second is that the operator should stand on the ground of the discharge room of the digester when discharging the material, and use the slag pump, slag unloader and other discharging tools to drain the material and liquid, so as to make the ports open and facilitate air convection inside and outside the pool;
Third, the lower pool maintenance and slag, do not allow single operation, the lower pool personnel must wear a safety helmet and protective mask, fasten the safety rope, the pool must have special personnel monitoring and collusion, the pool staff feel a little discomfort, should immediately go to the pool outside the ventilation rest;
Fourth, under the pool personnel are not allowed to use open flame lighting, ignition and smoking, lighting in the pool can only use a flashlight or riot light;
Fifth, after the discharge and overhaul, the cover of the discharge chamber shall be promptly closed to prevent accidents caused by falling people and animals.
The fourth pass: Safety rescue "The tragedy that occurred in Zigong. The three people who later saved the victim were all caused by blindness caused by an emergency situation." Yin Xianzhi explained that he emphasized that we must do it in accordance with the methods of safe rescue. Really help Others and protect yourself. In the event of on-site salvage of biogas asphyxiation and poisoning accidents, once personnel entering the pool become asphyxiated and poisoned, and they cannot be quickly rescued, they should immediately take a manual method to send air to the pool to input fresh air so as to avoid causing continuous asphyxiation poisoning accidents;
The rescue personnel must not blindly enter the pool. They must operate according to the safety requirements of the pool. They can enter the pool under the premise of ensuring safety, so as to avoid continuous casualties;
After asphyxiation and poisoning personnel are rescued from the pool, they should be lifted to a cool, ventilated place on the ground, unbuttoned coat buttons and belts, and immediately undergo artificial respiration. At the same time, an emergency call should be made and the nearest person should be sent for rescue.
On-site rescue of biogas burn accidents, first, in the event of a biogas fire accident, should quickly cut off the air supply and power outside, and notify the immediate fire; Second, the person burned by the biogas should quickly take off the clothes on fire, or Others take measures such as splashing water to extinguish fire, do not use dry clothing to fight, and they must not run in a hurry to encourage fire, such as fire in the pool, splash water from the top down, and rescue people from the pool as quickly as possible; Burned clothing, rinse the body with clean water, use a clean coat or sheets to protect the wound or the body, keep warm in the cold season and send ** treatment as soon as possible.
If a construction pit collapse accident happens during the construction of the pool, the earth on the pressured person's head should be lifted first, then the earth around the pressured person should be quickly opened, and the pressured personnel should be rescued as soon as possible; If there is a crack around the pool pit when the person is saved, use a door panel, etc. to support and fix it to prevent continuous injuries.
How to safely use biogas digesters to prevent similar tragedies from happening again. On May 11, the reporter interviewed Yin Xianzhi, a biogas security expert from the Provincial Rural Energy Office. According to him, because biogas fermentation must be an anaerobic environment, biogas is flammable and explosive gas, there is no oxygen in the pool, a small amount of * hydrogen gas in the biogas can also paralyze nerves, so once a person enters the pool, he can easily lose his consciousness. Asphyxiation causes safety accidents such as casualties.
The first pass: Safety Jianchi Yin Xianzhi explained that in accordance with national regulations and Sichuan Rural Energy Regulations, farm households building biogas digesters should be required to hold professional workers who hold a “biogas production worker†national vocational qualification certificate, and strictly implement “household useâ€. Biogas tank construction operating procedures," and other standards. Biogas tanks should be sited as far as possible to avoid pedestrian passages, landslides, etc. The distance between the pool site and the biogas digester should be controlled within 25 meters, and the biogas tanks should be built in conjunction with livestock and poultry housing and toilets. Human and animal excrement flows into the pool.
Safety helmets should be worn for construction personnel and construction work should be avoided during high temperature hours. Sick construction, fatigue construction, and late night construction are strictly prohibited. During flood season construction, it is necessary to avoid the construction of rain and do a good job of flood control drainage measures. Drainage trenches shall be set around the pond pits, diversion trenches shall be installed at the bottom of the pond, and rainproof sheds shall be erected to prevent the pit from collapsing due to heavy rainfall.
When digging biogas pits, mud should be kept away from pool pits to prevent landslides. During construction, attention should be paid to the safety of buildings on the ground, such as farm houses. After digging pool pits, timely construction is required. Biogas cooking appliances and related products must be installed in a timely manner to dispose of waste pits in a timely manner.
The second pass: Safety gas "The installation and overhaul of biogas pipe fittings and other facilities and equipment should be handled by professionals who hold the "Biogas Production Workers" national vocational qualification certificate, and strictly implement the "Rural Household Biogas Pipeline Construction and Installation Operation Procedures." "And other standards." Yin Xianzhi stressed that the installation of pipelines must not intersect with the wire, gas cookers should be placed on a dedicated stove, away from flammable items. Farmers should carefully read the instructions for use of equipment such as biogas stoves, and close the valves after use. When it is found that switches, pipes, stoves and other leaks, should promptly close the valve, open the doors and windows, prohibit the use of open fire, smoking, switching electrical appliances, and timely maintenance and repair of professional maintenance personnel.
The gas generated during the initial stage of the newly-built biogas digester is exhaust gas and should be discharged outdoors. During discharge, it is forbidden to test the fire at the discharge port and air guide pipe to avoid tempering and cause explosion of the tank body. It is forbidden to put various pesticides and harmful substances into the biogas digesters. It is forbidden for children to play near the biogas digesters and play with fires. It is strictly forbidden to smoke and use open flames beside the biogas digesters. Regular observation of biogas pressure changes, when the control purifier pointer pressure reached 9Kpa, should be timely gas.
To do a daily inspection of the digester pool and supporting facilities, the contents and methods of overhaul are:
One is whether the sealing cover is leaky. If leakage is found, repair it in time to prevent fire or suffocation.
The second is whether the inlet and outlet cover plates are damaged or missing. Once they are found damaged or missing, they must be repaired and replaced in time to prevent people and livestock from falling into the biogas tanks.
Third, whether there is crack on the ground around the digester. Once cracks are found, the cause must be identified and handled in time;
Fourth, the switch, pipe, pipe fittings are leaky, if loose, broken, damaged or aging, repair or replacement in time;
Fifth, whether the pressure gauge or stove body is damaged. Once it is found to be damaged, it must be repaired and replaced in time;
Sixth, whether the desorption agent is saturated or not, if it becomes dark brown, it must be updated in time.
The third pass: Safe discharge and maintenance “This phase is the easiest to have a safety accident.†Yin Xianzhi reminded that non-professionals are prohibited from entering the pool for discharging and overhauling unfilled biogas digesters.
Biogas digesters and large discharges should be handled by professional maintenance personnel. In order to discharge and overhaul the pools, the following requirements must be observed:
First, the biogas digester with movable cover opens the movable cover plate, the biogas digester with no movable cover plate, pulls out the air supply pipe on the air guide pipe or opens the bypass switch, and uses manual or mechanical methods to blow air into the pool to drain the biogas in the pool. After the biogas in the pool is exhausted, the use of live poultry for verification must be carried out in the pool under the premise of ensuring safety;
The second is that the operator should stand on the ground of the discharge room of the digester when discharging the material, and use the slag pump, slag unloader and other discharging tools to drain the material and liquid, so as to make the ports open and facilitate air convection inside and outside the pool;
Third, the lower pool maintenance and slag, do not allow single operation, the lower pool personnel must wear a safety helmet and protective mask, fasten the safety rope, the pool must have special personnel monitoring and collusion, the pool staff feel a little discomfort, should immediately go to the pool outside the ventilation rest;
Fourth, under the pool personnel are not allowed to use open flame lighting, ignition and smoking, lighting in the pool can only use a flashlight or riot light;
Fifth, after the discharge and overhaul, the cover of the discharge chamber shall be promptly closed to prevent accidents caused by falling people and animals.
The fourth pass: Safety rescue "The tragedy that occurred in Zigong. The three people who later saved the victim were all caused by blindness caused by an emergency situation." Yin Xianzhi explained that he emphasized that we must do it in accordance with the methods of safe rescue. Really help Others and protect yourself. In the event of on-site salvage of biogas asphyxiation and poisoning accidents, once personnel entering the pool become asphyxiated and poisoned, and they cannot be quickly rescued, they should immediately take a manual method to send air to the pool to input fresh air so as to avoid causing continuous asphyxiation poisoning accidents;
The rescue personnel must not blindly enter the pool. They must operate according to the safety requirements of the pool. They can enter the pool under the premise of ensuring safety, so as to avoid continuous casualties;
After asphyxiation and poisoning personnel are rescued from the pool, they should be lifted to a cool, ventilated place on the ground, unbuttoned coat buttons and belts, and immediately undergo artificial respiration. At the same time, an emergency call should be made and the nearest person should be sent for rescue.
On-site rescue of biogas burn accidents, first, in the event of a biogas fire accident, should quickly cut off the air supply and power outside, and notify the immediate fire; Second, the person burned by the biogas should quickly take off the clothes on fire, or Others take measures such as splashing water to extinguish fire, do not use dry clothing to fight, and they must not run in a hurry to encourage fire, such as fire in the pool, splash water from the top down, and rescue people from the pool as quickly as possible; Burned clothing, rinse the body with clean water, use a clean coat or sheets to protect the wound or the body, keep warm in the cold season and send ** treatment as soon as possible.
If a construction pit collapse accident happens during the construction of the pool, the earth on the pressured person's head should be lifted first, then the earth around the pressured person should be quickly opened, and the pressured personnel should be rescued as soon as possible; If there is a crack around the pool pit when the person is saved, use a door panel, etc. to support and fix it to prevent continuous injuries.
Futian Machinery Co., Ltd. , http://www.skywin-extruder.com