喷粉压力及点火延迟时间对粉尘爆炸参数的影响

张博; 张奇; 谭汝媚

doi:10.11858/gywlxb.2014.02.008

喷粉压力及点火延迟时间对粉尘爆炸参数的影响

doi: 10.11858/gywlxb.2014.02.008

北京理工大学爆炸科学与技术国家重点实验室，北京 100081

基金项目: 国家自然科学基金项目(11372044)

详细信息

作者简介:
张博(1987—), 男，硕士研究生，主要从事事故演化动力学研究.E-mail:benchang1987@126.com

通讯作者:
张奇(1956—), 男，教授，主要从事安全理论与技术研究.E-mail:qzhang@bit.edu.cn

中图分类号: O389;X932
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出版历程
- 收稿日期: 2012-03-22
- 修回日期: 2012-07-03

Influence of Dispersion Pressure and Ignition Delay Time on the Dust Explosion Parameters

State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 为进一步研究影响粉尘爆炸特性参数的因素，在5 L柱形密闭爆炸容器中，以食用玉米淀粉为试样，利用高压放电火花点火，并通过压力采集系统记录容器内压力的变化，研究了不同吹粉压力下，点火延迟时间对粉尘爆炸压力参数的影响，并对实验现象进行了理论分析。实验结果表明:点火延迟时间对粉尘爆炸压力和压力上升速率影响显著；吹粉压力存在一个临界值，当吹粉压力大于临界值时，存在一个最佳点火延迟时间，使得爆炸压力峰值和压力上升速率峰值最大，且随着吹粉压力的增大，粉尘爆炸的最佳点火延迟时间缩短；当吹粉压力小于临界值时，点火延迟时间越长，粉尘爆炸压力越小。
- 粉尘爆炸 /
- 吹粉压力 /
- 点火延迟时间 /
- 爆炸压力 /
- 压力上升速率 /
- 玉米淀粉
Abstract: Dust explosion experiments were carried out in a 5 L closed cylindrical vessel using cornstarch dispersed with compressed air and ignited by high-voltage spark, for further study of the factors which affect the dust explosion parameters.With different dispersion pressure, the influence of ignition delay time on the pressure parameters of dust explosion was studied, and the experimental results were analyzed theoretically.The results show that the influence of ignition delay time on explosion pressure and rise rate of pressure is significant, a critical value of dispersion pressure is found.When dispersion pressure is higher than the critical pressure, there is an optimum ignition delay time, making the explosion pressure and pressure rise rate maximal.With the increasing of dispersion pressure, the optimum ignition delay time decreases.When dispersion pressure is lower than the critical pressure, the pressure of dust explosion rises as the ignition delay time increases.
- dust explosion /
- dispersion pressure /
- ignition delay time /
- explosion pressure /
- rise rate of pressure /
- cornstarch

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图 1 实验系统示意图

Figure 1. Schematic of experimental set-up

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图 2 5 L柱形容器

Figure 2. The 5 L closed cylindrical vessel

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图 3 玉米淀粉扫描电子显微镜照片

Figure 3. Scanning electron microscope image of the cornstarch

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图 4 典型的玉米淀粉爆炸压力曲线

Figure 4. Typical pressure-time curve of cornstarch explosion

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图 5 点火延迟时间对爆炸压力的影响

Figure 5. Influence of ignition delay time on explosion pressure

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图 6 点火延迟时间对爆炸压力上升速率的影响

Figure 6. Influence of ignition delay time on rise rate of explosion pressure

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图 7 吹粉压力对最大爆炸压力和最大爆炸压力上升速率的影响

Figure 7. Influence of dispersion pressure on maximum explosion pressure and maximum rise rate of explosion pressure

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表 1 吹粉压力p_s=0.60 MPa时玉米淀粉爆炸的实验结果

Table 1. Experimental results of cornstarch explosion when p_s=0.60 MPa

t_d/ (ms)	p_m/ (MPa)	(dp/dt)_m/ (MPa·s^-1)
60	0.361 01	3.033 62
60	0.665 67	9.056 72
60	0.465 52	7.563 77
60	0.444 53	6.109 54
70	0.500 15	3.991 76
70	0.544 28	7.852 13
70	0.569 44	9.729 07
80	0.634 00	10.290 85
80	0.517 41	5.129 42
80	0.579 26	7.071 67
90	0.519 76	6.352 63
90	0.477 99	5.160 00
90	0.619 91	7.399 39
90	0.450 68	4.203 25
100	0.491 06	5.676 09
100	0.468 73	5.516 08
100	0.507 04	5.072 21
100	0.462 93	3.264 08
200	0.239 90	1.547 67
200	0.166 92	0.763 07
200	0.098 89	0.641 56

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表 2 吹粉压力p_s=0.50 MPa时玉米淀粉爆炸的实验结果

Table 2. Experimental results of cornstarch explosion when p_s=0.50 MPa

t_d/ (ms)	p_m/ (MPa)	(dp/dt)_m/ (MPa·s^-1)
100	0.295 03	2.308 47
100	0.300 19	2.192 18
100	0.393 72	2.919 47
100	0.331 01	2.636 61
140	0.335 51	0.263 26
140	0.417 63	3.202 63
140	0.349 47	2.784 11
140	0.467 10	4.731 72
140	0.265 01	2.183 12
150	0.361 09	3.494 08
150	0.412 51	2.983 27
150	0.441 82	5.056 85
150	0.297 59	2.392 74
160	0.405 75	4.068 13
160	0.229 82	1.293 99
160	0.373 91	2.834 65
160	0.422 29	4.078 94

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表 3 吹粉压力p_s=0.40 MPa时玉米淀粉爆炸的实验结果

Table 3. Experimental results of cornstarch explosion when p_s=0.40 MPa

t_d/ (ms)	p_m/ (MPa)	(dp/dt)_m/ (MPa·s^-1)
150	0.225 56	1.645 16
150	0.250 91	2.002 67
150	0.288 42	1.750 54
180	0.306 51	2.655 32
180	0.390 02	3.944 88
180	0.203 12	1.292 90
190	0.343 05	2.866 37
190	0.309 87	2.458 32
190	0.345 24	2.670 65
200	0.393 38	3.620 61
200	0.254 82	1.996 56
200	0.403 90	3.591 35
210	0.313 44	2.746 62
210	0.325 07	2.600 36
210	0.265 78	1.874 49
250	0.255 14	1.271 95
250	0.227 22	1.194 41
250	0.227 22	1.194 41

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表 4 吹粉压力p_s=0.35 MPa时玉米淀粉爆炸的实验结果

Table 4. Experimental results of cornstarch explosion when p_s=0.35 MPa

t_d/ (ms)	p_m/ (MPa)	(dp/dt)_m/ (MPa·s^-1)
30	0.352 07	5.368 77
30	0.484 84	10.142 86
30	0.471 23	8.504 05
50	0.475 84	8.486 99
50	0.381 88	4.383 70
50	0.406 40	4.490 46
100	0.353 59	3.264 20
100	0.572 16	3.264 20
100	0.328 90	4.000 88
200	0.256 87	1.738 46
200	0.118 17	0.969 86
200	0.198 13	1.302 51
200	0.096 87	0.707 28

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表 5 吹粉压力p_s=0.30 MPa时玉米淀粉爆炸的实验结果

Table 5. Experimental results of cornstarch explosion when p_s=0.30 MPa

t_d/ (ms)	p_m/ (MPa)	(dp/dt)_m/ (MPa·s^-1)
30	0.504 01	10.075 03
30	0.401 68	6.089 00
30	0.507 93	9.291 64
50	0.375 40	4.994 49
50	0.363 59	3.882 16
50	0.391 82	4.382 96
80	0.304 17	2.565 62
80	0.375 98	4.790 62
80	0.394 49	3.687 00
100	0.358 69	3.602 43
100	0.261 19	2.450 56
100	0.357 29	3.700 16
150	0.270 90	1.767 62
150	0.316 10	3.698 96
150	0.291 30	2.699 97
200	0.185 97	1.080 47
200	0.186 12	1.052 11
200	0.197 82	1.979 10
200	0.236 38	2.114 03
250	0.191 49	1.353 56
250	0.157 11	1.113 00
250	0.112 26	1.011 96
250	0.146 25	0.869 75
300	0.110 93	0.415 76
300	0.152 07	0.910 87
300	0.191 98	0.975 18
350	0.068 79	0.462 72
350	0.166 58	1.054 05
350	0.069 84	0.353 86

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