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Gas radiation heating system is used in large-space, how to guarantee the safety?

time：2023-08-17
hits：1540次
source：正弘奧能

According to Article 3.1.1 of the Code for Fire Protection of Building Design GBJ16-87 (2001 edition), "Various production using gas, liquid and solid as fuel or burning gas and liquid for other purposes", the fire risk category belongs to Class D.Therefore, the fire risk level of gas radiation heating system used in tall space buildings is relatively low.In the design of single-storey tall space plant, there is little difference between Class D and Class E buildings.Therefore, the use of gas radiation heating will not increase the risk and design difficulty of the building.However, it should be noted that the gas radiation heating system is prohibited to be installed in the basement, where there are flammable and explosive gases, dust and other media.


	 


	However, due to the high surface temperature of the radiation tube, if the installation height is too low, the radiation intensity felt by the human body will exceed the requirements of human comfort, so the "Civil building heating ventilation and air conditioning design Code" (GB50736-2014) article 5.6.3 stipulates that the installation height of the gas infrared radiator should not be less than 3m.Due to the dependence of gas radiant heating on combustible gas, the design requirements of ventilation and fire protection in building design are higher than those of ordinary buildings, and emergency ventilation should be set up according to regulations, and corresponding combustible gas detection and alarm devices should be made.


	 


	<img src="http://www.qxtxbbs.cn/Uploads/image/20230817/20230817094554_66211.png" alt="" /> 


	 


	So, at present, what are the safety requirements of gas infrared radiation heating systems?How should we protect it?According to the relevant national requirements for fire safety regulations, the overall design idea of fire safety in the building gas use site is to install combustible gas detectors in the gas use site, transmit the detection alarm signal to the fire alarm controller host, and control the cut-off solenoid valve and explosion-proof exhaust system on the transmission pipe, and cut off the electricity consumption of non-fire control facilities.


	 


	Taking IMPRESIND gas radiant heating system promoted and sold by Beijing Leadway Power Co., Ltd. as an example, the generator adopts double fans, micro-positive pressure and negative pressure system design, and double wind pressure differential switch configuration.When the system starts, the micro positive pressure fan starts, after the micro difference switch is closed, the negative pressure fan starts, after the negative pressure switch is closed, the burner ignits.The micro positive pressure fan can ensure the stability of the flame without flame spillover, and the negative pressure fan can well elongate the flame in the radiation tube to ensure the combustion efficiency.The dual fan configuration ensures flame safety to a large extent.In addition, the generator internal combustion valve system uses a multi-functional combined gas valve, which is tightly combined with a filter, regulator and pressure monitor.Meets DIN EN 161 Class A Class 2 requirements.Slow opening and fast closing, stable combustion, prevent deflagration.There is a flame ion monitoring port (fire window) in the generator, which can check whether the ignition needle is normal, whether the flame is normal, and the whole device is completely closed, which can effectively ensure the safety of debugging or maintenance personnel.


	 


	<img src="http://www.qxtxbbs.cn/Uploads/image/20230817/20230817094443_61811.png" alt="" /> 


	 


	The burner burns natural gas and the resulting hot fluid flows in the radiant tube driven by a smoke exhaust fan (vacuum pump).The radiation tube is made of real double-sided aluminized black gray alloy steel, which greatly improves the radiation efficiency and does not lose paint color.No distortion, damage, corrosion resistance, oxidation resistance to ensure service life.The aluminized steel is subjected to high temperature heat treatment in a strictly controlled temperature and humidity environment (black and gray surface is not coated or painted), the surface heat radiation is more uniform, and the thermal radiation efficiency is higher, thus ensuring that the heat is more uniform, and the radiation conductivity and thermal efficiency of the aluminized steel radiation tube are still efficient and stable even after many years of use.After the heat exchange of the hot fluid inside the radiation tube is completed, part of the product will be recycled (about 40%) through the premix chamber, and the other part will be discharged outside by the exhaust fan.Secondary heating to achieve energy saving, environmental protection, high efficiency, reduce operating costs.


	 


	<img src="http://www.qxtxbbs.cn/Uploads/image/20230817/20230817094454_62305.png" alt="" />

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Gas radiation heating system is used in large-space, how to guarantee the safety?