Anti-concrete mixing station warehouse top dust collector explosion method

Recently, an explosion occurred in a concrete factory in Foshan. The specific reasons have not been ascertained. However, there is a possible reason to be warned. Concrete processing companies are required to pay special attention to prevention, that is: the concrete mixer station warehouse top dust collector exploded.

Causes of explosion of the top dust collector of concrete mixing station

The first type: During the use of the roof dust collector, if the dust is more than the warning line, it will cause the roof dust collector to explode. The number of ashing should be reduced.

Second: no pressure safety valve is installed. The dust collector is clogged due to malfunction (or the worker does not turn on the dust removal function of the dust collector, causing the filter element to clog and the air cannot be released). The internal dust is clogged and the pressure inside the chamber is too large, causing an explosion. A pressure relief valve should be installed to automatically deflate when the pressure exceeds the safety valve warning line. To achieve the purpose of safe production.

Root cause analysis of production accidents of warehouse tops in concrete mixing plant

Due to the uneven quality of the operators, some production accidents will occur in the concrete mixing plant. The following is a brief analysis of the root causes of accidents in the following concrete mixing plants. The management control includes raw materials, coordination with design and control, production, transportation process control, delivery inspection and inspection. At present, the professional knowledge and quality awareness of many commercial concrete mixing plant managers are weak, and there is not enough understanding and understanding of the concrete industry and concrete products. The professional configuration of equipment selection is not accurate, or even no inspection at all. Some even measure by volume ratio. I don’t know modern computer office means, regard concrete production as traditional, simple, general building materials, simply pursue the maximization of interests, do not conscientiously implement normative standards, falsify, and thus replenish, ultimately leading to concrete Quality cannot be guaranteed to cause engineering quality accidents.

Several measures to solve the roof accident of cement powder bin dust collector Commercial concrete has been widely used in the construction industry in recent years, overcoming the dust and noise pollution of traditional on-site mixing, especially some large mixing stations (floor) with high technology content. The manufacturers pay more attention to environmental protection issues. Most of them use the dust-removing filter-type roof-top dust removal and mixing building centralized dust removal equipment , which gradually replaces the traditional bag-type dust collector. While there has been good dust effect, extend the life of dust, but the cement and powder coal ash dust fall Accidents still occur, serious pollution of the surrounding environment when mixing station, dust cover from twenty meters Falling from the left and right heights also brings serious safety accidents, which should be highly valued by our mixing station designers and mixing station users.

The roof top dust collector accident occurred, there are design defects and the user does not use the operating procedures. The author analyzes the causes and solutions of the powder silo in the design and practical use, and discusses with the industry peers.

1 Design reasons

The material transfer of the cement and fly ash silo is delivered by high-pressure air. During the transport process, the pressure in the silo is greater than atmospheric pressure, and the compressed air is released outward through the filter layer of the top dust collector. The national regulations stipulate that safety protection devices must be installed on the top of the powder bin. When the dust blocks the filter element or the ventilation is not smooth, the compressed air in the bin is unloaded through the safety relief valve to avoid the roof accident. However, many manufacturers neglect the function of the safety valve when designing. If the valve is not installed, when the vibrator of the top filter is broken, the dust will block the filter, and the air pressure in the chamber will rise easily. The roofing accident is caused, and the environmentally-friendly roof dust collector is damaged. The compressed air blows the cement or fly ash in the warehouse to a high altitude, forming a large pollution source, seriously polluting the surrounding environment, and even more, the dust collector top cover It rushed to the height of more than 20 meters, causing serious safety accidents. Add the security engineer site to your favorites

2 actual operation reasons

When the equipment manufacturer installs the indicator light of the level meter, it is generally installed in a certain part of the operation platform, which is convenient for the program controller to monitor the amount of powder. However, in the actual operation process, the general supplier is transported in the warehouse. When the powder is used, the actual reserves in the warehouse are generally unknown. When the indicator of the level meter is on, it is known that the powder bin is full. At this time, there is still 3 to 5T of space in the general warehouse. If it stops at this time, it should be The best chance. But most of the time, there is less communication between the program controller and the receiver and the delivery driver. The program controller is busy with production. It is inevitable that when the indicator light is off, it is easy to cause the powder to be full, but the driver does not know the result. Accidents, thereby polluting the environment and causing damage to the roof dust collector. According to the author's personal experience and the surrounding mixing station, such a roof accident has occurred.

3 Solutions

According to the above situation, the author has carried out transformation of several mixing stations, and achieved good results. After the modification, there was no roofing and topping accident. The specific method is:

3.1 Installation of the roof safety valve

The structure is prevented from being damaged by the vibrator or the failure of the backflushing device, and the dust filter is sealed to cause a roof accident. It is recommended that the manufacturer install a safety valve when it leaves the factory.

3.2 Set the roof vibration button and the level indicator or buzzer at the injection port

The specific approach is:

Connect the upper level meter terminal to the next signal power supply (this signal line is connected in parallel with the program control room indicator), with a meter box, connect the signal to the red indicator light or buzzer in the meter box, and dust the top of the warehouse. The control switch of the vibrating device or the backflushing device is connected to the meter box and is directly operated by the feeding driver or the receiver.

3.3 Institutional guarantee

Hang the operating procedures at the feeding port, clearly stipulate that the feeding driver should deliver the powder according to the regulations. The driver is the first responsible person. If there is a roof accident, the loss should be compensated. When the red light on the powder bin is bright during the conveying process, the feeding must be stopped, and the vibrator or backflushing device of the top dust collector should be operated for 3 to 5 minutes before feeding and 3 to 5 minutes after the feeding. Vibration or blow off the cement attached to the filter element.

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