Dehydration device of natural gas, switching control method and system

Abstract

The application provides a natural gas dehydration device, switching control method and system. The method includes: when entering the first working mode, control the third and fifth valves to open, control the fourth and sixth valves to close, and control the second and eighth valves Open, control the first and seventh valves to close, control the heater in the regeneration equipment to start; when the first working mode is switched to the second working mode, keep the current state of the eight valves unchanged, and control the heater to close; in the second When the working mode is switched to the third working mode, control the fourth and sixth valves to open, control the third and fifth valves to close, control the first and seventh valves to open, control the second and eighth valves to close, and control the heater to start; When the third working mode is switched to the fourth working mode, the states of the eight valves are kept unchanged, and the heater is controlled to be turned off. The application reduces the cost of equipment installation and maintenance, the switching control logic of the valve is simple, and the operability and safety of the dehydration device are improved.

Description

technical field [0001] The invention relates to the technical field of energy and chemical industry, in particular to a natural gas dehydration device, switching control method and system. Background technique [0002] The natural gas transported by the long-distance pipeline needs to be dehydrated and dried through the dehydration system. After the dehydration system dehydrates, the water dew point in the natural gas will be below -70°C. In the prior art, a dehydration system for dehydrating natural gas usually consists of 3 molecular sieve devices and as many as 13 control valves. [0003] The dehydration system in the prior art has many valves, so installation and maintenance are troublesome and the engineering cost is high. At the same time, the large number of valves leads to complex switching control logic. If the valve switching control is improper, it may cause equipment damage. Contents of the invention [0004] In view of this, the present invention provides a ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a natural gas dehydration device, switching control method and system to solve the problem that the dehydration system in the prior art has many valves, which leads to troublesome installation and maintenance, high engineering cost, and The control logic of the system is complex. If the valve switching control is improper, it may cause equipment damage. The technical solution is as follows:

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