Induction characteristics of carbon dioxide hydrate formation under intermittent flow

doi:10.16085/j.issn.1000-6613.2019-1227

Abstract

Abstract:

In order to clarify the variation of the induction time for carbon dioxide hydrate under intermittent flow conditions, experiments on the formation of CO₂ hydrate under air mass flow and slug flow system were carried out in the high-pressure visible hydrate loop. The results showed that the induction time decreased as the flow rate increased under the air mass flow. However, the induction time increased as the flow rate increased under the slug flow. The reason for this phenomenon was that the gas-liquid contact area was the main factor restricting hydrate nucleation in air mass flow, while in slug flow, the main factor had become the decrease of nucleation driving force caused by the decrease of temperature drop rate. Meanwhile, the prediction model of the influence of flow pattern on induction time was established with the intermittent flow parameter model and the gas hydrate induction time model, the calculated value of which was in good agreement with the experimental data , and the relative error was less than 10%.

Key words: hydrate, induction time, air mass flow, slug flow, model

摘要：

为明确二氧化碳水合物在间歇流条件下诱导时间的变化规律，本文在高压水合物循环实验环路上进行了气团流及段塞流体系下的二氧化碳水合物生成实验，结果表明：气团流范围内诱导时间随流量增大而减小，而段塞流范围内诱导时间随流量增大而增大。分析产生该现象的原因为，气团流时，制约水合物成核的主要因素是气液接触面积，而在段塞流时，制约水合物成核的主要因素已变为温降速率下降导致的成核驱动力下降。同时，结合间歇流参数模型与气体水合物诱导时间模型，建立了流型对诱导时间影响的预测模型，模型计算值与实验值具有较好的吻合性，相对误差均在10%以内。

关键词: 水合物, 诱导时间, 气团流, 段塞流, 模型

CLC Number:

TE832

Chengyuan HE,Shidong ZHOU,Tiancheng QIN,Wenwen ZHANG,Xiaofang LÜ,Shuli WANG,Haoyang JI. Induction characteristics of carbon dioxide hydrate formation under intermittent flow[J]. Chemical Industry and Engineering Progress, 2020, 39(4): 1348-1356.

何骋远,周诗岽,秦天成,张文文,吕晓方,王树立,姬浩洋. 间歇流条件下二氧化碳水合物生成诱导特性[J]. 化工进展, 2020, 39(4): 1348-1356.

Figures/Tables 15

工况	压力/MPa	温度/℃	气液体积比	流量/L?min^-1	流型
1	3	0.5	7∶33	1.68	气团流
2	3	0.5	7∶33	3.36	气团流
3	3	0.5	7∶33	8.40	气团流
4	3	0.5	7∶33	13.44	段塞流
5	3	0.5	7∶33	16.80	段塞流
6	3	0.5	7∶33	26.88	段塞流

工况	$z$	$n *$	A/×10³⁵m^-3·s^-1	G/m^-2·s^-1	J/m^-3·s^-1
1	0.00832	340	8.3081	22.1351	2411.916
2	0.00799	353	8.0842	21.0259	2853.709
3	0.00664	423	7.1462	16.7883	3734.732
4	0.00426	653	5.2879	9.9271	13277.710
5	0.00440	635	5.4180	10.3682	6783.020
6	0.00753	372	7.7604	19.4411	6380.770

工况	$z$	$n *$	A/×10³⁵m^-3·s^-1	G/m^-2·s^-1	J/m^-3·s^-1
1	0.00832	340	8.3081	22.1351	2411.916
2	0.00799	353	8.0842	21.0259	2853.709
3	0.00664	423	7.1462	16.7883	3734.732
4	0.00426	653	5.2879	9.9271	13277.710
5	0.00440	635	5.4180	10.3682	6783.020
6	0.00753	372	7.7604	19.4411	6380.770

流量/L·min^-1	诱导时间实验值/s	诱导时间计算值/s	相对误差/%	平均相对误差/%
1.68	1803	1856.6	2.89	4.99
3.36	1647	1679.6	1.94
8.4	1530	1571.6	2.65
13.44	903	963.2	6.25
16.8	1167	1260.7	7.43
26.88	1407	1293.2	8.80

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