近年来, 化工领域对二硫化碳需求日益增多, 而二硫化碳具有易燃易爆等特点。 在生产过程中易发生火灾事故, 危害性极大, 易造成经济损失和人员伤亡。 在火灾事故危害研究中, 火焰光谱研究极有必要。 因为火焰光谱中含有大量信息, 包括火焰温度、 燃烧组分、 各个波段的热辐射强度等信息。 以二硫化碳燃料为研究对象, 搭建了火焰光谱测试平台, 主要由VSR红外光谱仪、 伸缩装置、 燃烧器组成, 测试了5 cm燃烧尺度下二硫化碳、 苯乙烯、 乙腈、 乙酸乙酯燃料在1～14 μm红外波段上燃烧火焰光谱, 以及二硫化碳分别与苯乙烯、 乙腈、 乙酸乙酯三种不同燃料按照1∶1混合的火焰光谱, 获取了二硫化碳火焰光谱特征波段, 构建了二硫化碳火焰光谱特征库。 在燃料单独燃烧火焰光谱研究中, 二硫化碳燃料燃烧时火焰呈蓝色不发烟, 其火焰光谱辐射主要来自于高温下SO2, CO2和H2O三种分子辐射, 其中SO2特征峰为4.05, 7.4和8.51 μm, CO2特征峰为2.7和4.3 μm, H2O特征峰为2.5, 2.7和5.5～7 μm, 乙腈、 乙酸乙酯燃料燃烧火焰光谱特征基本一致, 火焰光谱辐射主要来自于高温下CO2, H2O分子辐射, 苯乙烯火焰光谱辐射除了高温气体辐射外还有较强的炭黑辐射, 炭黑辐射中心波长在7 μm, 温度大约在414 K。 除此之外, 苯乙烯燃料与其他三种化学品相比, 在3.6 μm波段处存在独有的C—H健伸缩振动峰。 二硫化碳火焰燃烧产物与苯乙烯、 乙腈、 乙酸乙酯三种燃料相比具有独有的SO2分子, 其在4.05, 7.4和8.51 μm处存在特有的特征峰, 这些特征峰可作为航天探测识别其火灾依据之一; 在燃料混合燃烧火焰光谱研究中, 二硫化碳与苯乙烯、 乙腈、 乙酸乙酯三种燃料混合燃烧时, 燃烧火焰光谱特征基本相似, 火焰光谱辐射主要来自高温下CO2, H2O和SO2分子辐射, 实验表明, 在混合燃烧时, 二硫化碳的火焰光谱特征峰未被其他燃料的组分干扰, 特征峰仍然明显。 这一研究结果可为后续利用航天遥感探测技术探测识别二硫化碳火灾研究奠定基础。

In recent years, the demand for carbon disulfide in the chemical industry is increasing, and carbon disulfide is flammable and explosive. In the production process, fire accidents of carbon disulfide are prone to occur, which are extremely harmful and easy to cause economic losses and casualties. In the study of fire accident hazard, the flame spectrum research is very necessary. Because the flame spectrum contains much information, including flame temperature, combustion components, thermal radiation intensity of each band, etc., it is necessary to conduct an in-depth study of its flame spectral radiation. In this paper, carbon disulfide as the research object, and the flame spectrum test platform was built based on infrared spectroscopy. The test platform was mainly composed of VSR infrared spectrometer, telescopic device and burner. The carbon disulfide, styrene, acetonitrile and ethyl acetate were tested at 5 cm combustion scale. The combustion flame spectrum of carbon disulfide, styrene, acetonitrile and ethyl acetate fuels in the infrared range of 1～14 μm was tested at 5 cm combustion scale, and the carbon disulfide was mixed with styrene, acetonitrile and ethyl acetate in 1∶1. Flame spectrum, the characteristic band of carbon disulfide flame spectrum was obtained, and the carbon dioxide flame spectrum characteristic database was constructed. In the study of fuel flame spectrum, the carbon dioxide flame is blue when it burns, and does not smoke, it is flame spectrum radiation mainly comes from three kinds of molecular radiations of SO2, CO2 and H2O at high temperature. The characteristic peak of SO2 is 4.05, 7.4 and 8.51 μm, CO2 characteristic peak is 2.7 and 4.3 μm, H2O characteristic peak is 2.5, 2.7 and 5.5～7 μm. The spectral characteristics of acetonitrile and ethyl acetate fuel combustion flames are basically similar. The flame spectrum radiation mainly comes from CO2 and H2O molecular radiation at high temperature. In addition to high-temperature gas radiation, styrene flame spectrum radiation has strong carbon black radiation, the carbon black has a center wavelength of 7 μm and a temperature of about 414 K. In addition, styrene fuel has a unique C—H* stretching peak at 3.6 μm compared to the other three chemicals. Compared with the flame spectrum characteristics of styrene, acetonitrile and ethyl acetate, the carbon disulfide flame spectrum has unique characteristic peaks at 4.05, 7.4 and 8.51 μm, which are generated by SO2 molecules. These characteristic peaks can be used as one of the fire bases for space exploration. In the study of fuel mixed combustion flame spectroscopy, when carbon disulfide is mixed with styrene, acetonitrile and ethyl acetate, the combustion flame spectrum characteristics are basically similar. The flame spectrum radiation mainly comes from CO2, H2O and SO2 molecular radiation at high temperature. The experimental results also show that in the mixed combustion, the flame spectral characteristic peak of carbon disulfide is not interfered by the components of other fuels, and the characteristic peak is still obvious. This result can lay a foundation for the research on detecting and identifying carbon disulfide fire using space remote sensing detection technology.