RU221344U1 - Natural gas compressor - Google Patents

Abstract

The utility model relates to the field of compressor engineering, namely to piston compressors that provide compression of natural gas. A three-row W-type piston compressor for compressing natural gas includes a crankcase with a horizontally located crankshaft having two bearing journals and one crankpin on which three identical connecting rods are mounted, each of which is connected to a crosshead of the first, second and third rows, respectively, connected by means of rods with pistons installed with the possibility of reciprocating movement in the cylinders, with the first row located vertically, and the second and third rows located on either side of it with a camber angle between the rows of 60°. The compressor is characterized by the fact that it is four-stage, in the first row there is a double-acting piston of the first stage, in the second row there is a double-acting piston of the second stage, and in the third row there is a differential piston of the third and fourth stages. The proposed design reduces the overall dimensions of high-pressure compressors and makes it possible to create a compact compressor for compressing natural gas as part of a CNG filling station.

Description

This utility model relates to the field of compressor engineering, namely to piston compressors that provide compression of natural gas.

In particular, this useful model can be used for compressing natural gas at automobile gas filling stations (CNG filling stations).

The specific application of compressor equipment for automobile gas filling stations is:

1) the need to ensure a significant pressure drop, since natural gas comes out of a natural gas pipeline, as a rule, at low pressure (from 0.3 to 0.6 MPa), and for compression and filling into cylinders it is advisable to have increased pressure (25, 0 MPa);

2) the requirement for pumping or compression of natural gas without contamination by lubricating oils, to ensure the purity of natural gas for the purpose of adsorption drying, and storage in containers without precipitation of oil residues in droplet form, which is unacceptable.

3) requirements for the tightness of compressors, since the release of explosive and flammable natural gas into the environment into the atmosphere is unacceptable;

4) minimum overall dimensions for placement at a gas filling station.

Various designs of piston W-shaped compressors are known (G.A. Pospelov, P.I. Plastinin, A.I. Shvarts, A.H. Safin, Volumetric compressors. Atlas of designs, M., Mechanical Engineering, 1994).

A well-known three-cylinder piston compressor with two-stage compression and a W-shaped arrangement of cylinders is KT-6. The compressor is made with a horizontally located crankshaft, the cylinders are located at an angle of 60° relative to each other in the vertical plane

(Asadchenko V.R. Automatic brakes of rolling stock: Textbook for universities of railway transport M.: Route, 2006, pp. 143-146).

A W-shaped compressor and a W-shaped compressor from Hydor (Finland) are known; two cylinders are used as the first compression stage, the third as the second stage. (Positive displacement compressors: Atlas of designs. Textbook for university students on the specialty "Refrigeration and compressor machines" (G.A. Pospelov, P.I. Plastinin, A.I. Shvarts et al., M. Mechanical Engineering, 1994. l. 5, 6, 11).

These compressors provide a small pressure drop and have large overall dimensions, which does not allow them to be effectively used for compressing natural gas in containerized CNG filling stations.

The objective of this utility model is to reduce the weight and size parameters of high-pressure natural gas compressors.

The technical result is the creation of a compressor for compressing natural gas for CNG filling stations with minimal overall dimensions.

The essence of the utility model is as follows.

A three-row W-type piston compressor for compressing natural gas includes a crankcase with a horizontally located crankshaft having two bearing journals and one crankpin on which three identical connecting rods are mounted, each of which is connected to a crosshead of the first, second and third rows, respectively, connected by means of rods with pistons installed with the possibility of reciprocating movement in the cylinders, with the first row located vertically, and the second and third rows located on either side of it with a camber angle between the rows of 60°. The compressor is characterized by the fact that it is four-stage, in the first row there is a double-acting piston of the first stage, in the second row there is a double-acting piston of the second stage, and in the third row there is a differential piston of the third and fourth stages.

In fig. 1 shows a cross-section of the compressor; FIG. 2 - compressor diagram.

A three-row piston W-shaped compressor for compressing natural gas (see Fig. 1) includes a crankcase 1 with a crankshaft 2 located in it, the first row 3 is located vertically, the second row 4 is located at an angle of 60° to the vertical, the third row 5 is located under an angle of 60° to the vertical. The crankshaft 2 contains two support and one connecting rod journal, on which three identical connecting rods 6 are installed, each of which is connected to the crosshead 7, 8, 9 of the first, second and third rows, respectively. The crossheads are connected by rods 10, 11, 12 to pistons 13, 14, 15, respectively. Oil seals are used to seal the rods, and piston rings are provided in the pistons. Pistons 13, 14, 15 are installed with the possibility of reciprocating movement in the cylinders.

The compressor is made of four stages, in the first row 3 there is a double-acting piston 13 of the first stage, in the second row 4 there is a double-acting piston 14 of the second stage, and in the third row 5 there is a differential piston 15 of the third and fourth stages.

The first stage cylinder has an inlet pipe 16 connected to the suction valves 17 and an outlet pipe 18 connected to the discharge valves 19. The second stage cylinder has an inlet pipe 20 connected to the suction valves 21 and an outlet pipe 22 connected to the discharge valves 23. B The third stage cylinder has an inlet pipe 24, connected to the suction valves 25, and an outlet pipe 26, connected to the discharge valves 27. The fourth stage cylinder has an inlet pipe 28, connected to the suction valve 29, and an outlet pipe 30, connected to the discharge valve 31 .

In a compressor, to ensure compression to high pressure, it is necessary to use at least 4 compression stages with interstage cooling (see Fig. 2). At the exit from the first stage there is a cooler 32 and a moisture separator 33, at the exit from the second stage there is a cooler 34 and a moisture separator 35, at the exit from the third stage there is a cooler 36 and a moisture separator 37, at the exit from the fourth stage there is a cooler 38 and a moisture separator 39. For circulation There is a pump 40 in the crankcase. An electric motor 41 is provided to drive the compressor.

Due to the fact that the connecting rods 6 are located on the same connecting rod journal of the crankshaft 2, and the compressor rows 3, 4, 5 are located practically in the same plane, therefore the compressor crankcase 1, and the compressor as a whole, has a minimum length (comparable to the outer diameter of the 1st stage cylinder) .

The use of a large-diameter and double-acting piston 13 in the first vertical row 3 in the first stage allows, with an identical stage volume, to significantly reduce the height of the row and the compressor as a whole, while valves 17 and 19, inlet and outlet pipes 16 and 18 are not located at the end, and on the side surfaces of cylinder 1 and also do not increase the height of the compressor.

Placing rows 4 and 5 at an angle of 60° to the vertical reduces the width of the compressor compared to an opposed row arrangement, allowing the compressor to be located and serviced in a shipping container.

A three-row W-shaped piston compressor for compressing natural gas works as follows.

The crankshaft 2 located in the compressor crankcase 1 (see Figs. 1 and 2) is driven by an electric motor 41.

Low pressure natural gas of about 0.3-0.6 MPa from the gas pipeline enters the first stage cylinder, which is located in the first row 3. The crankshaft 2, through the connecting rod 6, the crosshead 7 and the rod 10, transmits translational motion to the piston 13 of the first stage. Gas enters the first stage cylinder through the inlet pipe 16 and suction valves 17, and the double-acting piston 13 compresses the gas in the upper and lower cavities of the cylinder to a pressure of the order of 1.0-1.2 MPa, and exits through the discharge valves 19 and the outlet pipe 18 from the first stage. After compression, gas with a high temperature of about 180-200°C enters cooler 32, where the gas temperature is reduced to 25-35°C, and into moisture separator 33, where the gas is cleaned of solid particles and droplets of moisture and passes into the second stage cylinder, which located in the second row 4.

Crankshaft 2, through connecting rod 6, crosshead 8 and rod 11, transmits translational motion to piston 14 of the second stage. Gas enters the second stage cylinder through the inlet pipe 20 and suction valves 21, and then by a double-acting piston 14 the gas is compressed in the upper and lower cavities of the cylinder to a pressure of the order of 3.0-4.2 MPa, and then through the discharge valves 23 and the outlet pipe 22 comes out of the second stage. After compression, gas with a high temperature of about 180-200°C enters cooler 34, where the gas temperature is reduced to 25-35°C, and into moisture separator 35, where the gas is cleaned of solid particles and droplets of moisture and passes into the third stage cylinder, which located in the third row 4.

Crankshaft 2, through connecting rod 6, crosshead 9 and rod 12, transmits translational motion to differential piston 15 of the third and fourth stages. Gas enters the third stage cylinder through the inlet pipe 24, the suction valves 25 and the piston 15 are compressed in the lower cavity of the cylinder to a pressure of the order of 9.0-12.0 MPa, and exits the third stage through the discharge valves 27 and the outlet pipe 26. After compression, gas with a high temperature of about 180-200°C enters cooler 36, where the gas temperature is reduced to 25-35°C, and into moisture separator 37, where the gas is cleaned of solid particles and droplets of moisture and passes into the fourth stage cylinder, which also located in the third row 4. Gas enters the fourth stage cylinder through the inlet pipe 28, the suction valves 29 and the piston 15 are compressed in the upper cavity of the cylinder to a pressure of the order of 24.0-25.0 MPa, and exits through the discharge valves 31 and the outlet pipe 30 from the fourth stage. After compression, the gas with a high temperature of about 180-200°C enters the cooler 38, where the gas temperature is reduced to 25-35°C, and into the moisture separator 39, where the gas is cleaned of solid particles and droplets of moisture, leaves the compressor and is sent to the consumer. To circulate oil in the compressor, an electrically driven oil pump 40 with a pressure gauge and a control valve is provided.

The proposed design reduces the overall dimensions of high-pressure natural gas compressors and makes it possible to create a compact compressor for compressing natural gas as part of a CNG filling station.

Claims (1)

A three-row W-shaped piston compressor for compressing natural gas, including a crankcase with a crankshaft located horizontally in it, having two bearing journals and one connecting rod journal, on which three identical connecting rods are installed, each of which is connected to the crosshead of the first, second and third rows, respectively, connected by means of rods to pistons installed with the possibility of reciprocating movement in the cylinders, with the first row located vertically, and the second and third rows located on both sides of it with a camber angle between the rows of 60°, characterized in that the compressor is made of four stages, in in the first row there is a double-acting piston of the first stage, in the second row there is a double-acting piston of the second stage, and in the third row there is a differential piston of the third and fourth stages, while the valves, inlet and outlet pipes of the vertical row are located on the side surfaces of the first stage cylinder.

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