Research on inherent safety of chemical process based on fuzzy reasoning-combination weighting

doi:10.16265/j.cnki.issn1003-3033.2023.08.1389

Abstract

Abstract:

In order to improve the production safety level of chemical enterprises, 10 indexes were selected based on the intrinsic safety index method (ISI), and an intrinsic safety evaluation index system for chemical processes was established. Each evaluation index level was divided, and fuzzy reasoning was carried out with Mamdani fuzzy reasoning method in the Matlab environment. The rule output matrix under each three-level index was established according to the safety grade score value under the four-level index parameters. The sensitivity of fuzzy theoretical intrinsic safety evaluation results was preserved to the maximum extent, and the visual 3D fuzzy inference surface diagram was obtained. In order to accurately evaluate the intrinsic safety evaluation results, an objective function with the minimum distance and both subjective and objective weights was established, and the combined subjective and objective weights of each evaluation index calculated by the normalization method and entropy weight method were optimized to reduce the bias of the combined weight results. This method was applied to evaluate the intrinsic safety degree of four process routes, and the evaluation results were basically consistent with the evaluation methods proposed by predecessors. The research shows that: Based on the fuzzy inference-combination weighting intrinsic safety evaluation method, the distance deviation of subjective and objective weights is minimized while taking into account the subjective and objective weights. The evaluation results of this method are basically consistent with those of previous literature, which proves that this method has certain scientificity and effectiveness.

Key words: fuzzy logic, combination weighting, chemical process, inherent safety, evaluation indexes

ZHANG Rendong, ZHANG Lijing, TAO Gang. Research on inherent safety of chemical process based on fuzzy reasoning-combination weighting[J]. China Safety Science Journal, 2023, 33(8): 149-155.

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评级指标等级指标				本质安全度评估等级
一级	二级	三级	四级	I(VL)	II(L)	III(M)	IV(H)	V(VH)
化工工艺过程本质安全模糊评价指标	化工原料本质安全	主副反应热危险	I₁反应热/(J·g^-1)	(-200,0]	(-600,-200]	(-1 200,-600]	(-3 000, -1200]	(-∞,-3 000]
		主副反应热危险	I₂反应热/(J·g^-1)	(-200,0]	(-600,-200]	(-1 200,-600]	(-3 000, -1200]	(-∞,-3 000]
		火灾爆炸危险	I₃闪点/℃	(120,+∞)	(60,120]	(45,60]	(28,45]	(-273,28]
		火灾爆炸危险	I₄爆炸危险度/%	(0,1)	[1,5)	[5,10)	[10,15)	[15,+∞)
		潜在危险	I₅/10^-6	(100,+∞)	(10,100]	(1,10]	(0.1,1]	(0,0.1]
		潜在危险	I₆设备材料	碳钢	不锈钢	耐腐材料	—	—
	工艺条件本质安全	反应条件危险	I₇温度/℃	(0,70)	[70,150)∪ (-273,0]	[150,300)	[300,600)	[600,+∞)
		反应条件危险	I₈压力/MPa	(0.05,0.5)	(0,0.05]∪ [0.5,2.5)	[2.5,5)	[5,20)	[20,+∞)
		储量及设备危险	I₉储量/t	(0,1)	[1,10)	[10,50)	[50,200)	[200,+∞)
		储量及设备危险	I₁₀种类	处理不可燃、无毒材料设备	塔、泵、热交换器	高危泵、一般反应器、空气冷却器	压缩机、高危反应器	明火炉、火焰加热器

输入参数	分级	代码	等级判据	模糊类型	模糊函数
燃烧性	很低危险	VL	(120,+∞)	梯形	[90 120 +∞ +∞]
	低危险	L	(60,120]	三角形	[52.2 90 120]
	中危险	M	(45,60]	三角形	[36.5 52.2 90]
	高危险	H	(28,45]	三角形	[28 36.5 52.5]
	很高危险	VH	(-273,28]	梯形	[-273 -273 28 36.5]

主副反应热危险		副反应热
主副反应热危险		I级(VL)0	II级(L)1	III级2(M)	IV级(H)3	V级(VH)4
主反应热	I级(VL)0	0(VL)	1(VL-L)	2(L)	3(L-M)	4(M)
	II级(L)1	1(VL-L)	2(L)	3(L-M)	4(M)	5(M-H)
	III级(M)2	2(L)	3(L-M)	4(M)	5(M-H)	6(H)
	IV级(H)3	3(L-M)	4(M)	5(M-H)	6(H)	7(H-VH)
	V级(VH)4	4(M)	5(M-H)	6(H)	7(H-VH)	8(VH)

评价指标	主反应热	副反应热	燃烧性	爆炸性	毒性	腐蚀性	操作温度	操作压力	反应单元物料量	设备装置
ISI中取值范围	0~4	—	0~4	0~4	0~6	0~2	0~4	0~4	0~5	0~4
权重系数	0.108 1	—	0.108 1	0.108 1	0.162 2	0.054 1	0.108 1	0.108 1	0.135 1	0.108 1

工艺	I₁/(J·g^-1)	I₂/(J·g^-1)	I₃/℃	I₄/%	I₅	I₆	I₇/℃	I₈/MPa	I₉/t	I₁₀
丙酮氰醇法	-3 757	—	-188	7	2	2	1 200	0.7	100	4
丙稀法	-883	—	-108	7	0.5	2	354	12	100	3
异丁烯法	-1 659	—	-76.1	7	20	1	395	0.75	100	2
叔丁醇法	-1 656	—	-15	7	20	1	350	0.75	100	2