Study of EDC parameters for predicting entrained flow coal gasification

doi:10.11949/0438-1157.20221131

Abstract

Abstract:

The entrained flow coal gasifier is a multi-phase turbulent reactor accompanied by homogeneous reaction processes such as combustion and transformation, which can be simulated by eddy dissipation concept (EDC) model for turbulence-chemical reaction interaction, but the model parameters need to be corrected. The effects of EDC model parameters on syngas temperature and composition were investigated by analyzing the parameter modification range of EDC model for gasifier under Realizable κ-ε condition with a 1500 t/d opposed multi-burner (OMB) coal-water slurry (CWS) gasifier. Four groups of EDC models with different parameters and (finite-rate/eddy-dissipation) ED model was numerically investigated and verified with the outlet industrial data. The results showed that when C_D1=0.213,0.272≤C_D2≤2.268. After modification of the model constants in this range, the relative errors of temperature, CO and H₂ volume fraction at the outlet were lower than original value, and the minimum were -2.54%, -3.93%, and 0.74%, respectively, while those of the ED model were 7.95%, 5.52% and -2.74%, respectively. The temperature and composition results of the EDC simulation with default parameters are always within the range of the boundary parameter model, and the range becomes narrower closer to the gasifier outlet, and the simulation results of each model tend to be consistent.

Key words: entrained flow reactor, opposed multi-burner, slurry, gasification, numerical simulation

摘要：

气流床煤气化炉是多相湍流反应器，伴随燃烧、变换等均相反应过程，可由eddy dissipation concept（EDC）模型模拟湍流-化学反应相互作用，但需修正模型参数。以1500 t/d多喷嘴对置水煤浆气化炉为对象，分析了Realizable κ-ε条件下气化炉EDC模型的参数修正范围，考察了EDC模型参数对合成气温度和组成的影响。结果表明，当C_D1=0.213时，0.272≤C_D2≤2.268。在此范围修正EDC模型参数，气化炉出口温度、CO和H₂体积分数相对误差比修正前降低，最小可分别达到-2.54%、-3.93%和0.74%，模型修正范围可靠。默认参数的EDC模拟温度和组成结果始终处于边界参数模型范围内，且该范围越靠近气化炉出口越窄，各模型模拟结果趋于一致。

关键词: 气流床, 多喷嘴, 浆料, 气化, 数值模拟

CLC Number:

TQ 546

Peng QIU, Yang HAN, Jianliang XU, Fuchen WANG, Zhenghua DAI. Study of EDC parameters for predicting entrained flow coal gasification[J]. CIESC Journal, 2023, 74(1): 428-437.

仇鹏, 韩洋, 许建良, 王辅臣, 代正华. 用于预测气流床煤气化的EDC模型参数研究[J]. 化工学报, 2023, 74(1): 428-437.

Figures/Tables 16

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Case	原料	湍流方程	次级参数	文献
1~12	CH₄	Realizable κ-ε	C_τ =0.4083~8，C_γ =2.1377~13	[6]
13~15	CH₄	Realizable κ-ε	C_τ =0.4083，C_γ =2.14~4.4	[11]
16	CH₄	DNS/Standard κ-ε	C_τ =0.41，C_γ =4.6	[12]
17	CH₄	SST κ-ω	C_τ =0.4083，C_γ =10.7	[13]
18~23	CH₄	Realizable κ-ε	C_τ =0.4083，C_γ =4.3~21.45	[14]
—	CH₄	Standard κ-ε	not modified	[15]
—	CH₄	Standard κ-ε	not modified	[16]
—	coal	Realizable κ-ε	not modified	[17]
—	CH₄	Standard κ-ε	not modified	[10]
—	CH₄	Standard κ-ε	not modified	[18]
—	solid waste	Standard κ-ε	not modified	[19]
—	CH₄	Standard κ-ε	not modified	[20]
—	coal	Realizable κ-ε	not modified	[21]

Case	原料	湍流方程	次级参数	文献
1~12	CH₄	Realizable κ-ε	C_τ =0.4083~8，C_γ =2.1377~13	[6]
13~15	CH₄	Realizable κ-ε	C_τ =0.4083，C_γ =2.14~4.4	[11]
16	CH₄	DNS/Standard κ-ε	C_τ =0.41，C_γ =4.6	[12]
17	CH₄	SST κ-ω	C_τ =0.4083，C_γ =10.7	[13]
18~23	CH₄	Realizable κ-ε	C_τ =0.4083，C_γ =4.3~21.45	[14]
—	CH₄	Standard κ-ε	not modified	[15]
—	CH₄	Standard κ-ε	not modified	[16]
—	coal	Realizable κ-ε	not modified	[17]
—	CH₄	Standard κ-ε	not modified	[10]
—	CH₄	Standard κ-ε	not modified	[18]
—	solid waste	Standard κ-ε	not modified	[19]
—	CH₄	Standard κ-ε	not modified	[20]
—	coal	Realizable κ-ε	not modified	[21]

Case No.	C_τ	C_γ	C_D1	C_D2	C_R	α_L	Re_T(1)	Re_T(2)	L^*/η	τ^/τ_η*	Re^*	Re_T atε₂/ε=0.1	ε₂/ε atRe_T=50	ε₂/ε atRe_T=1	Re_T atγ_λ=0.75
1	0.4083	2.1377	0.134	0.50	11.2	27.84	20.9	0.2	1.4	0.4	2.49	225.5	0.2848	0.8276	66.0
2	0.4083	3.2066	0.060	0.50	25.2	140.97	105.7	0.2	2.1	0.4	5.60	1141.8	0.5559	0.9192	334.1
3	0.4083	5.56	0.020	0.50	75.7	1274.20	955.7	0.2	3.7	0.4	16.83	10321.0	0.8206	0.9724	3020.3
4	0.4083	8.45	0.009	0.50	174.9	6797.76	5098.3	0.2	5.6	0.4	38.87	55061.8	0.9178	0.9879	16113.2
5	0.4083	13	0.004	0.50	413.9	38081.33	28561.0	0.2	8.7	0.4	92.00	308458.8	0.9644	0.9949	90266.9
6	8.0000	13	0.071	192.00	21.1	38081.33	28561.0	64.0	169.8	8.0	1802.67	308458.8	0.9644	0.9949	90266.9
7	8.0000	4	0.750	192.00	2.0	341.33	256.0	64.0	52.3	8.0	170.67	2764.8	0.6836	0.9473	809.1
8	8.0000	5	0.480	192.00	3.1	833.33	625.0	64.0	65.3	8.0	266.67	6750.0	0.7832	0.9660	1975.3
9	8.0000	6	0.333	192.00	4.5	1728.00	1296.0	64.0	78.4	8.0	384.00	13996.8	0.8438	0.9762	4096.0
10	8.0000	7	0.245	192.00	6.1	3201.33	2401.0	64.0	91.4	8.0	522.67	25930.8	0.8826	0.9825	7588.3
11	8.0000	10	0.120	192.00	12.5	13333.33	10000.0	64.0	130.6	8.0	1066.67	108000.0	0.9406	0.9914	31604.9
12	8.0000	13	0.071	192.00	21.1	38081.33	28561.0	64.0	169.8	8.0	1802.67	308458.8	0.9644	0.9949	90266.9
13	0.4083	2.14	0.134	0.50	11.2	27.96	21.0	0.2	1.4	0.4	2.49	226.5	0.2855	0.8279	66.3
14	0.4083	3.2	0.060	0.50	25.1	139.81	104.9	0.2	2.1	0.4	5.57	1132.5	0.5546	0.9189	331.4
15	0.4083	4.4	0.032	0.50	47.4	499.75	374.8	0.2	2.9	0.4	10.54	4047.9	0.7298	0.9563	1184.6
16	0.4100	4.6	0.029	0.50	51.6	596.99	447.7	0.2	3.1	0.4	11.57	4835.7	0.7495	0.9599	1415.1
17	0.4083	10.7	0.005	0.50	280.4	17477.28	13108.0	0.2	7.1	0.4	62.33	141566.0	0.9479	0.9925	41427.6
18	0.4083	4.3	0.033	0.50	45.3	455.84	341.9	0.2	2.9	0.4	10.07	3692.3	0.7191	0.9542	1080.5
19	0.4083	6.4	0.015	0.50	100.3	2236.96	1677.7	0.2	4.3	0.4	22.30	18119.4	0.8613	0.9791	5302.4
20	0.4083	8.55	0.008	0.50	179.0	7125.30	5344.0	0.2	5.7	0.4	39.80	57714.9	0.9197	0.9882	16889.6
21	0.4083	12.95	0.004	0.50	410.7	37498.84	28124.1	0.2	8.6	0.4	91.30	303740.6	0.9641	0.9948	88886.1
22	0.4083	15	0.003	0.50	551.1	67500.00	50625.0	0.2	10.0	0.4	122.49	546750.0	0.9732	0.9962	160000.0
23	0.4083	21.45	0.001	0.50	1126.9	282259.08	211694.3	0.2	14.3	0.4	250.48	2286298.6	0.9868	0.9981	669058.6
24	0.8695	2.4745	0.213	2.268	7.0	49.99	37.5	0.8	3.5	0.9	7.10	404.9	0.3819	0.8682	118.5
25	0.3011	1.4562	0.213	0.272	7.0	6.00	4.5	0.1	0.7	0.3	0.85	48.6	0.0976	0.6666	14.2

Case No.	C_τ	C_γ	C_D1	C_D2	C_R	α_L	Re_T(1)	Re_T(2)	L^*/η	τ^/τ_η*	Re^*	Re_T atε₂/ε=0.1	ε₂/ε atRe_T=50	ε₂/ε atRe_T=1	Re_T atγ_λ=0.75
1	0.4083	2.1377	0.134	0.50	11.2	27.84	20.9	0.2	1.4	0.4	2.49	225.5	0.2848	0.8276	66.0
2	0.4083	3.2066	0.060	0.50	25.2	140.97	105.7	0.2	2.1	0.4	5.60	1141.8	0.5559	0.9192	334.1
3	0.4083	5.56	0.020	0.50	75.7	1274.20	955.7	0.2	3.7	0.4	16.83	10321.0	0.8206	0.9724	3020.3
4	0.4083	8.45	0.009	0.50	174.9	6797.76	5098.3	0.2	5.6	0.4	38.87	55061.8	0.9178	0.9879	16113.2
5	0.4083	13	0.004	0.50	413.9	38081.33	28561.0	0.2	8.7	0.4	92.00	308458.8	0.9644	0.9949	90266.9
6	8.0000	13	0.071	192.00	21.1	38081.33	28561.0	64.0	169.8	8.0	1802.67	308458.8	0.9644	0.9949	90266.9
7	8.0000	4	0.750	192.00	2.0	341.33	256.0	64.0	52.3	8.0	170.67	2764.8	0.6836	0.9473	809.1
8	8.0000	5	0.480	192.00	3.1	833.33	625.0	64.0	65.3	8.0	266.67	6750.0	0.7832	0.9660	1975.3
9	8.0000	6	0.333	192.00	4.5	1728.00	1296.0	64.0	78.4	8.0	384.00	13996.8	0.8438	0.9762	4096.0
10	8.0000	7	0.245	192.00	6.1	3201.33	2401.0	64.0	91.4	8.0	522.67	25930.8	0.8826	0.9825	7588.3
11	8.0000	10	0.120	192.00	12.5	13333.33	10000.0	64.0	130.6	8.0	1066.67	108000.0	0.9406	0.9914	31604.9
12	8.0000	13	0.071	192.00	21.1	38081.33	28561.0	64.0	169.8	8.0	1802.67	308458.8	0.9644	0.9949	90266.9
13	0.4083	2.14	0.134	0.50	11.2	27.96	21.0	0.2	1.4	0.4	2.49	226.5	0.2855	0.8279	66.3
14	0.4083	3.2	0.060	0.50	25.1	139.81	104.9	0.2	2.1	0.4	5.57	1132.5	0.5546	0.9189	331.4
15	0.4083	4.4	0.032	0.50	47.4	499.75	374.8	0.2	2.9	0.4	10.54	4047.9	0.7298	0.9563	1184.6
16	0.4100	4.6	0.029	0.50	51.6	596.99	447.7	0.2	3.1	0.4	11.57	4835.7	0.7495	0.9599	1415.1
17	0.4083	10.7	0.005	0.50	280.4	17477.28	13108.0	0.2	7.1	0.4	62.33	141566.0	0.9479	0.9925	41427.6
18	0.4083	4.3	0.033	0.50	45.3	455.84	341.9	0.2	2.9	0.4	10.07	3692.3	0.7191	0.9542	1080.5
19	0.4083	6.4	0.015	0.50	100.3	2236.96	1677.7	0.2	4.3	0.4	22.30	18119.4	0.8613	0.9791	5302.4
20	0.4083	8.55	0.008	0.50	179.0	7125.30	5344.0	0.2	5.7	0.4	39.80	57714.9	0.9197	0.9882	16889.6
21	0.4083	12.95	0.004	0.50	410.7	37498.84	28124.1	0.2	8.6	0.4	91.30	303740.6	0.9641	0.9948	88886.1
22	0.4083	15	0.003	0.50	551.1	67500.00	50625.0	0.2	10.0	0.4	122.49	546750.0	0.9732	0.9962	160000.0
23	0.4083	21.45	0.001	0.50	1126.9	282259.08	211694.3	0.2	14.3	0.4	250.48	2286298.6	0.9868	0.9981	669058.6
24	0.8695	2.4745	0.213	2.268	7.0	49.99	37.5	0.8	3.5	0.9	7.10	404.9	0.3819	0.8682	118.5
25	0.3011	1.4562	0.213	0.272	7.0	6.00	4.5	0.1	0.7	0.3	0.85	48.6	0.0976	0.6666	14.2

项目	出口温度/℃	相对误差/%	CO体积分数 (干基)/%	相对误差/%	H₂体积分数 (干基)/%	相对误差/%	碳转化率/%
工业数据	1220	—	46.77	—	35.10	—	98.8
ED	1317	7.95	49.35	5.52	34.14	-2.74	98.1
EDC-case 1	1138	-6.72	42.15	-9.88	37.71	7.44	98.1
EDC-case 2	1144	-6.23	42.55	-9.02	37.56	7.01	98.1
EDC-case 24	1149	-5.82	43.59	-6.80	35.74	1.82	98.1
EDC-case 25	1189	-2.54	44.93	-3.93	35.36	0.74	98.1