快热中子法检测煤的低位热值

Detection of low caloric power of coal by fast-thermal neutron method

介绍了利用脉冲中子发生器产生的快热中子感生的瞬发γ射线的两种反应,快中子非弹性散射(n,n’γ)反应和热中子俘获(n,γ)反应,对煤的低位热值进行分析的方法、原理和设备。γ射线探测器采用BGO探头。采用多元回归分析方法,较好地解决了元素间的干扰问题。用脉冲中子法测得的低位热量分析值与化验值的误差<0．4MJ／kg。

This paper introduced the analysis method, principle and system of the low caloric power of coal by means of the fast-thermal neutron-induced gamma-ray by pulsed neutron generator. Fast-thermal neutron interact with the nucleus of the coal to produce inelastic scattering（n, n＇, γ） reaction and neutron capture（n, γ） reaction. We avoid the interfere of different elements with the multiple linear regression on spectra and BGO Gamma-ray detector. The error of low caloric power of coal between the method of pulsed neutron and conventional chemical analysis is below 0. 4MJ/kg.