Natural Gas Hydrate Prediction and Prevention Methods of City Gate Stations

Table 1

Comparison of inhibitor injection volume calculation.

Temperature before throttling (°C)	Water dew point (°C)	Injection volume of methanol L (10^4 Nm^3)			Injection volume of ethanol L (10^4 Nm^3)			Injection volume of ethylene glycol L (10^4 Nm^3)
		HYSYS	Program	Abs. e	HYSYS	Program	Abs. e	HYSYS	Program	Abs. e
−5	−5	3.02	3.01	0.01	3.24	3.26	0.02	0.89	0.87	0.02
	−6	2.95	2.94	0.01	3.19	3.19	0	0.77	0.76	0.01
	−7	2.88	2.88	0	3.12	3.13	0.01	0.68	0.66	0.02
	−8	2.82	2.82	0	3.06	3.07	0.01	0.58	0.56	0.02
	−9	2.76	2.77	0.01	3.00	3.02	0.02	0.47	0.47	0
−10	−10	2.76	2.67	0.09	2.86	2.92	0.06	0.95	0.91	0.04
	−11	2.69	2.61	0.08	2.81	2.86	0.05	0.84	0.80	0.04
	−12	2.63	2.56	0.07	2.75	2.81	0.06	0.75	0.70	0.05
	−13	2.57	2.51	0.06	2.70	2.76	0.06	0.64	0.61	0.03
	−14	2.52	2.45	0.07	2.65	2.7	0.05	0.56	0.52	0.04