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Natural gas pipeline network pressure energy recovery method and device using piston expander

A natural gas pipeline network and recovery device technology, applied in steam engine devices, piston rings, pipeline systems, etc., can solve problems such as unsafe operation, natural gas leakage, and reduced expansion efficiency, and achieve increased work volume, zero leakage recovery, and recovery. Effect

Active Publication Date: 2017-05-10
SHENZHEN GAS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the seal of the existing piston expander piston is difficult to maintain good sealing performance at low temperature, resulting in natural gas leakage, which leads to problems such as reduced expansion efficiency and unsafe operation

Method used

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  • Natural gas pipeline network pressure energy recovery method and device using piston expander
  • Natural gas pipeline network pressure energy recovery method and device using piston expander
  • Natural gas pipeline network pressure energy recovery method and device using piston expander

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] The equipment composition reference of the embodiment figure 1 ; The structure diagram of the expander is as follows: figure 2 shown.

[0050] Taking a small pressure regulating station as an example, the station has a regulating flow rate of 1900Nm3 / h, a regulating scale of 6MPa to 1.6MPa, and an initial natural gas temperature of about 20°C.

[0051] (1) Natural gas that meets the instantaneous demand of the urban pipeline network at 1373kg / h, with a pressure of 6MPa and a temperature of 20°C, passes through the first shut-off valve 1, the first solenoid valve 2, and the electric control valve 3, and then enters the expander 6 to expand and depressurize to 1.6MPa After returning to 5°C through the pressure-temperature balancer 11 and the reheater 12, it enters the downstream medium-pressure gas pipeline network through the second solenoid valve 15 and the second shut-off valve 16;

[0052] The high-pressure natural gas is expanded by the expander 6 to convert the p...

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Abstract

The invention discloses a natural gas pipeline network pressure energy recovery method and a device using a piston expander. The device comprises a pipeline device system, a power generating system and an intelligent control system. The pipeline device system comprises a first shutoff valve, a first solenoid valve, an electric regulating valve, an expander, a pressure and temperature balancing device, a reheater, a second solenoid valve and a second shutoff valve. All the components of the pipeline device system are connected through the pipeline between a high pressure pipe network and a low pressure pipe network. The power generating system comprises a gearbox connected with the expander, a generator connected with the gearbox, a power source connected with the generator power output. The intelligent control system comprises a PLC, a first and a second pressure transmitter, a first and a second temperature transmitter and a speed transmitter. The natural gas pipeline network pressure energy recovery method and device using the piston expander not only can increase the comprehensive value of the natural gas, but also can enhance the economy efficiency of a combustion system, possess strong adaptability, and be applicable to the high pressure pipe network with a pressure of larger than 4MPa or a pressure regulation working condition with an expansion ratio higher than 10.

Description

technical field [0001] The invention relates to the field of recovery and utilization of the pressure energy of a natural gas pipeline network, in particular to a method and a device for recovering the pressure energy of a natural gas pipeline network by using a piston expander. Background technique [0002] Due to the world's energy crisis and people's growing calls for environmental protection, the proportion of natural gas in the world's energy structure continues to increase. At present, for the long-distance transportation of natural gas, high-pressure transportation is generally used. For example, the first and second lines of the West-East Gas Pipeline use 10MPa and 12MPa respectively for natural gas transportation, thereby reducing the loss of gas transportation. Before the upstream high-pressure natural gas is delivered to large-scale users and city gas, the pressure is reduced according to the needs of different users and supplied to downstream users. The traditio...

Claims

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Application Information

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IPC IPC(8): F01K27/00F01K25/10F01K13/02F01B23/10F01B31/00F16J9/26F17D3/01
CPCF01B23/10F01B31/00F01K13/02F01K25/10F01K27/00F16J9/26F17D3/01
Inventor 陈秋雄陈运文杜琳琳王晓东徐文东
Owner SHENZHEN GAS CORP
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