Operation of upgraded gas pumping unit of compressor station of main gas pipeline

Abstract

FIELD: gas transportation equipment.SUBSTANCE: used in the creation of gas turbine pumping units. The method is implemented by using an additional tubular regenerative heat exchanger-air heater in the gas pumping unit. The air compressed in the compressor moves in the inter-tube space of the tube bundle of the tubular regenerative heat exchanger-air heater perpendicular to its tubes, and the liquid organic coolant moves inside the tubes of its bundle. The exhaust gases of the gas turbine move perpendicular to the tubes of the bundle of the gas turbine exhaust gas recovery heat exchanger, and the high-temperature organic coolant moves inside its tubes. The perpendicular movement of the exhaust gas flow in the intertube space of the tube bundle of the exhaust gas recovery heat exchanger, relative to the movement of the organic coolant in its tubes, ensures an increase in the efficiency of heat exchange and a reduction in the metal consumption of the exhaust gas recovery heat exchanger.EFFECT: increasing the efficiency of operating low-power gas turbine pumping units.1 cl, 1 dwg

Description

[0001] Field of technology to which the invention relates

[0002] The invention relates to gas transportation equipment and can be used in the creation of gas turbine gas pumping units.

[0003] Technology Level

[0004] A gas pumping unit with a heat recovery system for gas turbine gas pumping units is known (RU Patent No. 2635423). The gas pumping unit comprises a gas turbine engine, a centrifugal compressor, and an exhaust gas heat recovery system with a plate heat exchanger installed outside the exhaust tract, wherein the inlet of the heating cavities of the heat exchanger is connected to the exhaust tract, and the outlet is connected to the atmosphere; the inlet of the heated cavities of the heat exchanger is connected to the atmosphere, and the outlet of the heated cavities of the heat exchanger is connected to a heat consumer installed outside the exhaust tract and connected to the heat consumer.

[0005] The article by V. E. Spitsyn, A. L. Botsula, S. N. Movchan, V. N. Chobenko, and D. N. Solomonyuk, "A Regenerative Gas Turbine Unit for a 16 MW Gas Pumping Unit" (Turbines and Diesels Magazine), reports that Zorya-Mashproekt developed a regenerator design for a 16 MW gas turbine unit used to drive a natural gas compressor. A tubular two-section regenerator with favorable weight and size parameters was proposed. The regenerator's heat exchange surface is made of flat parallel tubular coils. Gas turbine exhaust gases flow around the outside of the regenerator's heat exchange surface tube, while air moves within these tubes. It has been shown that in a 16 MW gas turbine unit, which can be equipped with this regenerator, the degree of regeneration will be no lower than 0.85, and the total hydraulic resistance of the regenerative heat exchanger will not exceed 4%, which will ensure a gas turbine efficiency of 40.3%.

[0006] High-temperature organic heat transfer fluids with operating temperatures up to +400°C, containing synthetic mineral and silicone oils, are used in process heat exchangers and thermal oil boilers. https: / / ru.ruwiki.ru / wiki / High-temperature organic heat transfer fluid. The development of regenerative gas compressor units (GPUs) that utilize exhaust gas heat using high-temperature organic heat transfer fluids is promising.

[0007] Russian Patent No. 2758074, "Method for Recovering Exhaust Gas Heat and a Device for Implementing the Same," proposes a method for recovering heat from the exhaust gases of a gas turbine plant in a tubular regenerative air heater with Z-shaped heat-exchange tubes in a tube bundle. According to the proposed method, the gas turbine exhaust gas flow is divided into several fan-shaped streams and directed into the annular space transversely to the tube bundle, providing Z-shaped cross-heat exchange between the compressed air supplied to the tube bundle and the exhaust gases moving in its annular space. The regenerative tubular air heater consists of exhaust gas inlet and outlet ducts, heat exchange modules containing bundles of thermoelastic heat-exchange tubes, and collectors for the supply and outlet of recycled air. The method for regenerating heat from exhaust gases proposed in the patent is implemented as follows.The recycled air coming from the gas turbine's axial compressor is directed into the Z-shaped heat-exchange tubes of the tube bundle and fed through a collecting duct into the gas turbine's combustion chamber. The exhaust gas leaving the gas turbine is divided into several fan-shaped flows and fed into the annulus transverse to the heat-exchange tube bundle, achieving Z-shaped cross-flow heat exchange between the recycled air and the exhaust gases through the steel walls of the heat-exchange tubes contained within the tube bundle. The proposed regenerator is shown to be 1.6 times more efficient than the regenerator used in the GTK-10-4 unit, which features a two-pass or four-pass recycled air flow system and a staggered arrangement of heat-exchange tubes within the tube bundle.A disadvantage of this method is the increased metal consumption and technical complexity of a tubular air heater with a large number of heat-exchange tubes. In this heater, the heat from the gas turbine's exhaust gases is used to preheat the compressed air cycle. This is because the heat exchange in the tubular air heater's heat-exchange tubes is reduced due to the low heat transfer coefficient from the tube walls to the heated air. Patent No. 2758074 has been accepted as a prototype for the proposed invention.

[0008] Disclosure of the essence of the invention

[0009] The objective of the invention is to develop a method for operating a modernized gas pumping unit of a compressor station of a main gas pipeline with an increase in the efficiency of regenerating the heat of exhaust gases of the gas pumping unit of the compressor station.

[0010] The technical result is achieved in that in the method of operating a modernized gas pumping unit of a compressor station of a main gas pipeline, containing an air compressor, a combustion chamber, a gas turbine, a centrifugal supercharger, a tubular heat exchanger for the utilization of exhaust gases, for the implementation of the method, a tubular regenerative heat exchanger-air heater is additionally used, an organic coolant pipeline containing synthetic mineral and silicone oils, with a coolant pump, is carried out as follows: atmospheric air is compressed in an air compressor and fed into the combustion chamber together with fuel, the resulting combustion products are expanded in a gas turbine, the useful work of which is used to drive an air compressor and a centrifugal supercharger of natural gas of the main gas pipeline, the heat of the exhaust gases of the gas turbine is used to heat the organic coolant to 400 ° C,containing synthetic mineral and silicone oils, in the tubes of the tubular heat exchanger for exhaust gas recovery, the hot organic coolant is supplied by a coolant pump through the organic coolant pipeline into the tubes of the tubular regenerative heat exchanger - air heater and its heat is used for regenerative heating of the air compressed in the air compressor to a temperature of 350 - 370 °C.

[0011] The method is implemented by using an additional tubular regenerative heat exchanger / air heater in a gas pumping unit. Compressed air moves in the intertube space of the tubular regenerative heat exchanger / air heater perpendicular to its tubes, while the liquid organic coolant moves within the tubes of the tube bundle. The gas turbine exhaust gases move perpendicular to the tubes of the exhaust gas recovery heat exchanger, while the high-temperature organic coolant moves within its tubes. The perpendicular movement of the exhaust gas flow in the intertube space of the exhaust gas recovery heat exchanger's tube bundle relative to the movement of the organic coolant within its tubes improves heat exchange efficiency and reduces the metal consumption of the exhaust gas recovery heat exchanger.

[0012] Brief description of drawings

[0013] The drawing shows a basic thermal diagram of the modernized regenerative gas pumping unit of the compressor station of the main gas pipeline. It contains an air compressor - 1, a tubular regenerative heat exchanger-air heater - 2, a combustion chamber - 3, a gas turbine - 4, a centrifugal compressor - 5, a tubular heat exchanger for exhaust gas recovery - 6, and an organic coolant pipeline - 7. The heat exchange surfaces of the tubular regenerative heat exchanger-air heater 2 and the tubular heat exchanger for exhaust gas recovery 6 are made of steel tubes and are connected by an organic coolant pipeline 7 to a coolant pump 8.

[0014] Implementation of the invention

[0015] The operating method of a modernized gas pumping unit of a compressor station of a main gas pipeline containing an air compressor, a combustion chamber, a gas turbine, a centrifugal supercharger, a tubular regenerative heat exchanger-air heater, a tubular heat exchanger for the recovery of exhaust gases, an organic coolant pipeline, is carried out as follows: atmospheric air is compressed in an air compressor 1 and fed into a combustion chamber 3 together with fuel, the resulting combustion products are expanded in a gas turbine 4, the useful work of which is used to drive the air compressor 1 and the centrifugal supercharger 5 of natural gas of the main gas pipeline, the heat of the exhaust gases of the gas turbine 4 is used to heat up to 400 ° C an organic coolant containing synthetic mineral and silicone oils in the pipes of the tubular heat exchanger for the recovery of exhaust gases 6,hot organic heat carrier is supplied by means of heat carrier pump 8 through organic heat carrier pipeline 7 into the pipes of tubular regenerative heat exchanger-air heater 2 and its heat is used for regenerative heating of compressed air in air compressor 1 to a temperature of 350 - 370°C.

[0016] The proposed method allows:

[0017] - modernize existing low-power gas pumping units of compressor stations using regenerative heating of compressed air;

[0018] - reduce hydraulic losses in the exhaust tract of the gas turbine and increase its power;

[0019] - increase the regeneration coefficient and thermal efficiency of the gas pumping unit.

[0020] A comparison of the proposed operating method of a modernized gas pumping unit at a main gas pipeline compressor station with a prototype has led to the conclusion that the proposed method meets the "novelty" criterion. Taking into account the features that distinguish the proposed method from the prototype, it can be concluded that the proposed method meets the "significant differences" criterion.

Claims

The operating method of a modernized gas pumping unit of a compressor station of a main gas pipeline, comprising an air compressor, a combustion chamber, a gas turbine, a centrifugal supercharger, a tubular heat exchanger for exhaust gas recovery, characterized in that for the implementation of the method a tubular regenerative heat exchanger-air heater is additionally used, an organic coolant pipeline containing synthetic mineral and silicone oils, with a coolant pump, is carried out as follows: atmospheric air is compressed in an air compressor and fed into the combustion chamber together with fuel, the resulting combustion products are expanded in a gas turbine, the useful work of which is used to drive an air compressor and a centrifugal supercharger of natural gas of the main gas pipeline, the heat of the exhaust gases of the gas turbine is used to heat an organic coolant containing synthetic mineral and silicone oils to 400°C,in the pipes of the tubular heat exchanger for exhaust gas recovery, the hot organic coolant is supplied by a coolant pump through the organic coolant pipeline into the pipes of the tubular regenerative heat exchanger-air heater and its heat is used for regenerative heating of the air compressed in the air compressor to a temperature of 350-370°C.

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