Experimental study on influence factors of CH4 displacement by CO2

doi:10.16265/j.cnki.issn1003-3033.2022.04.017

Abstract

Abstract:

In order to study influence of multi-factor coupling on CH₄ production and CO₂ sequestration effect in the process of CH₄ displacement by CO₂, displacement experiment was carried out under conditions of different gas injection temperature(θ), pressure (P) and water content of coal samples (W). Variation characteristics of CH₄ output rate (η) and CO₂ storage rate (ξ) under different conditions were researched and analyzed. Then, η and ξ quadratic regression response surface models were built based on response surface methodology, separate influence of gas injection temperature (A), gas injection pressure (B) and moisture content (C) on η and ξ and interaction between each factor were investigated. The results show that η increases along with increase of θ and P, while decreases with that of W. ξ increases with increase of P, while decreases with that of θ and W. Among all influencing factors, A, B, and C are significant terms of η, B and C are those of ξ, and influence degree of primary term on η and ξ is C>B>A. That of interaction term on η is: BC>AC>AB, and the interaction between AC and BC is significant, while AB interaction is not. Influence degree of interaction term on ξ is AB>AC>BC, and interaction between AB and AC is extremely significant, while that between BC is not. The average deviations between experimental values outside coding interval of η and ξ of the 4 groups and predicted values of the model are 3.64% and 2.605%, respectively.

Key words: CH₄ displacement by CO₂, CH₄ output rate, CO₂ storage rate, influencing factors, Interaction

JIANG Yanhang, BAI Gang, ZHOU Xihua, WANG Siqi, WANG Lianhua, FAN Chaojun. Experimental study on influence factors of CH₄ displacement by CO₂[J]. China Safety Science Journal, 2022, 32(4): 113-121.

Figures/Tables 13

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水分 M_ad/%	灰分 A_ad/%	挥发分 V_daf/%	固定碳 F_cd/%	镜质组反射率R_0,max	朗格缪尔体积 V_L/(m³·t^-1)		朗格缪尔压力 P_L/MPa
水分 M_ad/%	灰分 A_ad/%	挥发分 V_daf/%	固定碳 F_cd/%	镜质组反射率R_0,max	CO₂	CH₄	CO₂	CH₄
1.5	9.17	13.24	76.34	1.50	42.781 8	26.287 9	2.208 0	1.571 8

试验序号	θ/℃	P/MPa	W/%	备注
1	30	0.8	2.12	温度影响
2	40	0.8	2.12
3	50	0.8	2.12
4	60	0.8	2.12
5	30	0.6	2.12	压力影响
6	30	1	2.12
7	30	1.2	2.12
8	30	0.8	0.96	水分影响
9	30	0.8	3.28
10	30	0.8	4.25

θ/℃	CH₄体积/L		CO₂体积/L		η/%	ξ/%
θ/℃	注入	产出	注入	封存	η/%	ξ/%
30	119.19	94.09	311.19	273.24	78.94	87.80
40	118.61	104.96	318.69	283.86	88.49	89.07
50	117.85	107.16	344.66	293.74	90.93	85.23
60	119.38	109.47	345.21	284.07	91.70	82.29

P/MPa	CH₄体积/L		CO₂体积/L		η/%	ξ/%
P/MPa	注入	产出	注入	封存	η/%	ξ/%
0.6	117.29	90.29	369.70	269.00	76.98	72.76
0.8	119.19	94.09	311.19	273.24	78.94	87.80
1	119.91	97.445	377.30	324.88	81.27	86.11
1.2	118.16	101.69	381.54	339.23	86.06	88.91

W/%	CH₄体积/L		CO₂体积/L		η/%	ξ/%
W/%	注入	产出	注入	封存	η/%	ξ/%
0.96	151.54	127.69	363.79	321.66	84.26	88.42
2.12	119.19	94.09	311.19	273.24	78.94	87.80
3.28	96.47	74.44	259.56	210.92	77.16	81.26
4.25	74.37	55.93	201.26	157.69	75.21	78.35

Experimental study on influence factors of CH₄ displacement by CO₂

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影响因素	代号	编码及水平			间距
影响因素	代号	-1	0	+1	间距
注气温度/℃	A	40	50	60	10
注气压力/MPa	B	0.8	1	1.2	0.2
含水率/%	C	0.96	2.12	3.28	1.16

编号	A/℃	B/MPa	C/%	η/%	ξ/%
1	40	0.8	2.12	86.23	85.46
2	60	0.8	2.12	89.34	83.63
3	40	1.2	2.12	89.12	84.83
4	60	1.2	2.12	90.26	86.24
5	40	1.0	0.96	88.65	85.15
6	60	1.0	0.96	91.87	83.26
7	40	1.0	3.28	82.89	81.37
8	60	1.0	3.28	83.16	82.23
9	50	0.8	0.96	86.28	84.64
10	50	1.2	0.96	91.25	85.75
11	50	0.8	3.28	81.14	82.96
12	50	1.2	3.28	82.65	83.15
13	50	1.0	2.12	91.12	85.63
14	50	1.0	2.12	89.96	85.57
15	50	1.0	2.12	90.37	85.65
16	50	1.0	2.12	90.82	85.58
17	50	1.0	2.12	89.68	84.78

项目	平方和	自由度	均方	F值	S值
模型	192.88	9	21.43	61.55	<0.000 1
A	7.49	1	7.49	21.51	0.002 4
B	13.24	1	13.24	38.02	0.000 5
C	99.48	1	99.48	285.72	<0.000 1
AB	0.97	1	0.97	2.79	0.139 0
AC	2.18	1	2.18	6.25	0.041 0
BC	2.99	1	2.99	8.60	0.022 0
残差	2.44	7	0.35	—	—
失拟项	1.03	3	0.34	0.98	0.487 3
纯误差	1.41	4	0.35	—	—

项目	平方和	自由度	均方	F值	S值
模型	31.78	9	3.53	35.73	<0.000 1
A	0.26	1	0.26	2.66	0.146 9
B	1.34	1	1.34	13.61	0.007 8
C	10.33	1	10.33	104.52	<0.000 1
AB	2.62	1	2.62	26.56	0.001 3
AC	1.89	1	1.89	19.13	0.003 3
BC	0.21	1	0.21	2.14	0.186 8
残差	0.69	7	0.099	—	—
失拟项	0.14	3	0.046	0.34	0.801 1
纯误差	0.55	4	0.14	—	—

序号	θ/℃	P/MPa	W/%	CH₄产出率/%		误差率/%	CO₂储存率/%		误差率/%
序号	θ/℃	P/MPa	W/%	试验值	预测值	误差率/%	试验值	预测值	误差率/%
1	30	0.6	2.12	78.94	77.30	2.12	87.80	86.62	1.36
2	30	0.8	2.12	88.49	84.02	5.32	89.07	84.33	5.62
3	30	1.0	2.12	90.93	87.78	3.59	85.23	82.76	2.98
4	30	1.2	2.12	91.70	88.57	3.53	82.29	81.91	0.46

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