The method of regeneration inhibitors drying and purification of natural gas

 

The invention relates to transport gas and is used to restore the high concentration of inhibitors. Saturated solution of inhibitor (PH) after the absorber is heated and enhance the recovery process inhibitor, for which a saturated solution of the inhibitor prior to its evaporation in desorber served in calogeropoulos, where in two stages heat up to temperature, eliminating the boiling and decomposition inhibitor. Given the technological scheme of the method and recommendations the heating temperatures of PH. 2 C.p. f-crystals, 5 Il.

The invention relates to gas purification and transportation of gas, and is used to restore the high concentration (regeneration) inhibitors for drying natural gas and the removal of acid components (hydrogen sulfide, carbon dioxide, and so on) and drying in the preparation of the gas to distant transport. Inhibitors: diethylene glycol (DEG), triethylene glycol (TEG), ethanolamine, diethanolamine and others, for example, in the drying process absorb water vapor from the gas. Saturation inhibitors water vapor leads to a decrease in the concentration of the latter, increases consumption and reduces the degree of dehydration.

A known method of recovering high concentrations inhib the e regeneration of the decomposition of the actual inhibitor to the formation of organic acids, increasing corrosiveness and reduce absorption properties of the inhibitors. Fire regenerators, i.e., furnaces are characterized by low reliability due to corrosion damage, blown coils and deposits on them.

Known technical solution regeneration inhibitors by heating inhibitors steam from the boiler to evaporate the moisture in the desorbers.

The disadvantages of the known solutions are large capital costs for construction of boiler plants and operating costs, environmental pollution by emissions of products of combustion and leaks of chemicals used on steam boilers.

The known method of regeneration inhibitors drying and purification of natural gas by using diethylene glycol (deg) (see Fig.1).

The raw gas enters the bottom section of the absorber 1, where the separation of the condensate, and in the upper part of absorber 1 upward flow of raw gas in contact with a descending stream of the regenerated solution deg. Saturated solution of DAG is given in the collector absorber. The cycle of regeneration (recovery) solution is heated and the residue from the solution of water. Heating nasusunog from the steam boiler 10. The evaporated moisture is released in the form of vapor through the top nozzle columns of desorber 5, and the regenerated solution DAG is cooled in the heat exchanger 9 and the refrigerator. For pumping solution serves as the pump 8. Loss solution deg filled from a separate container to high concentrations of inhibitor before it is fed into the absorber 1. This method is chosen as a prototype (see Jablonski B. C. and others, "Design of oil and gas, Moscow, Hectorthebat, 1959, p.225-227, Fig.79).

In the known solutions is not achieved stability recovery of high concentrations of inhibitors, leading to a violation of the regeneration process, which increases the dew point of the gas decreases as the gas to distant transport and increases the loss of inhibitor per unit volume of gas.

The claimed invention aims to remedy these disadvantages.

The invention solves the problem of improving the controllability of the process of regeneration inhibitors and environmental conditions, a significant reduction in capital and operating costs.

Achievable technical result is stabilization of recovery high concentrations of inhibitors and elimination of harmful emissions into the atmosphere.

The heating of the saturated solution of the inhibitor are in two stages: the first to 60-90oWith, and the second to a temperature of 10-15oWith a lower boiling point and a decomposition inhibitor.

The invention is illustrated by drawings, where Fig.1 shows a diagram of diethylene glycol dehydration by heating the latter in a firing furnace; Fig.2 - the same, with heating in a steam boiler plant; Fig.3 is the same as in Fig. 1, but the firing furnace replaced teplopelengatorom; Fig.4 is the same as in Fig. 2, but steam boiler plant was replaced by teplopelengatorom; Fig.5 - scheme of ablogidneedstore.

The method is carried out as follows. Raw gas in the absorber 1 (Fig.4) is in contact with a descending stream of the regenerated solution deg. Saturated solution of deg is removed from the collector absorber 1 and enters the lower part of desorber 3, is heated and fed to the input of ablogidneedstore reviewsa 150oWith, and then enters desorber.

In desorber saturating deg moisture is evaporated, and the concentrated solution of deg is fed by the circulation pump 5 into the container 2 and into the absorber 1, which again is in contact with an ascending stream of crude gas.

In accordance with the flow diagram (Fig. 3) a saturated solution of deg from the absorber 1 through the heat exchanger 9, weathering and filters is served in the labyrinth of the pump 10 calogeropoulos 11, where it is heated to a temperature of 60-90oC. Passing through calogeropoulos 11, deg is heated to a temperature not exceeding 150oC. it is Preferable to heat the saturated solution of DAG to a temperature of 135-145oC.

Heated to the indicated temperature, the solution Daggett served in desorber 1 (Fig. 3), in which the saturating deg moisture evaporates and is discharged from the upper part of desorber 5 through the condenser 6 in the condensate collector 7, and the regenerated concentrated solution of deg pump 8 is fed through the heat exchanger 9 and the fridge in the absorber 1. In the absorber 1 deg again saturated with moisture by absorbing it from the raw gas and a temperature of 15-20oWith returns through the heat exchanger 9 for the next regeneration cycle.

When regeneration inhibitors, for drying and ochistka consists of an electric motor explosion-proof execution 12, magnetic clutch 13, which provides complete sealing and environmental regeneration inhibitors, hydraulic pump parts 10 and an additional box of ablogidneedstore 11 (Fig.5).

The proposed method differs from existing solutions regeneration inhibitors drying and purification of natural gas: - application for the regeneration inhibitors ablogidneedstore; - use in the hydraulic part of ablogidneedstore magnetic coupling for sealing process; - ensuring the stability of the recovery of high concentrations of inhibitors that meets the technical requirements of the gas to distant transport; - efficiency in connection with the compactness and low capital cost for manufacturing installation ablogidneedstore, as well as minimum maintenance costs due to the need only periodic maintenance of the installation; - the environmentally friendly way of regeneration due to the lack of emission of combustion products into the atmosphere and discharge of chemicals.

Claims

1. The method of regeneration inhibitors purification and dehydration of natural gas (GHG) emissions, which consists in applying after drying PG the moisture-saturated solution in which it fed into the absorber, characterized in that intensify the process of recovering high concentrations of inhibitor, to which a saturated solution of inhibitor before evaporation in desorber served in calogeropoulos, where it is heated to a temperature that excludes the boiling and decomposition inhibitor, and the heat of saturated solution of inhibitor are in two stages: first to a temperature of 60 - 90oWith, and the second to a temperature of 10 - 15oC below the boiling point of the inhibitor.

2. The method according to p. 1, characterized in that for generating heat when heated saturated solution of inhibitor use centrifugal hydraulic device.

3. The method according to p. 1 or 2, characterized in that the regeneration inhibitor for complete sealing of ablogidneedstore applied magnetic coupling.

 

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