Method and device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate

Abstract

The invention discloses a method and a device for integrated utilization of natural gas pipe network pressure energy refrigeration and hydrate, wherein the method comprises the steps of carrying out shunting on the high pressure pipe network natural gas of a natural gas gate station; carrying out depressurization refrigeration on the natural gas which meets the instantaneous demand of urban pipe networks and storing the cold energy through cooling mediums; leading the depressurized natural gas to enter downstream urban pipe networks; leading another part of high pressure natural gas to enter ahydrate generation tower to generate natural gas hydrate slurry which flows into a hydrate storage tank for storage; using the cooling mediums in a low-temperature storage tank to provide cold energyfor the hydrate storage tank and the generation tower to generate the hydrate when in gas consumption trough; and heating to vaporize the hydrate in the storage tank for supplementing the downstreampipe networks when in gas consumption peak; and simultaneously applying the cold energy generated by the decomposition of the hydrate to cold water air conditioners and cold storages. The invention uses the natural gas pressure energy refrigeration to generate the natural gas hydrate, simultaneously applies the cold energy of the vaporization of the hydrate to air conditioners and cold storages, thus realizing the peak regulation function of the urban natural gas pipe networks and the electric network, and greatly improving the energy utilization efficiency.

Description

technical field [0001] The invention relates to the technical field of pressure energy expansion refrigeration, in particular to an integrated utilization method and device for pressure energy refrigeration of a natural gas pipeline network and hydrates. Background technique [0002] The energy shortage is getting worse day by day, energy conservation and emission reduction has become a top priority. It is an important content of energy saving and emission reduction technology to use the pressure energy lost and discharged to produce cold energy and make full use of it to replace electric refrigeration. During the "Eleventh Five-Year Plan" period, waste heat and waste pressure utilization projects are one of the ten energy-saving projects that my country has focused on promoting. However, the recovery and utilization of high-pressure natural gas pressure energy has not yet attracted enough attention. With the completion of my country's West-to-East Gas Transmission, Sichuan...

AI Technical Summary

Problems solved by technology

Chinese patent CN 101280723A is aimed at the problem of huge energy loss during the decompression process of high-pressure natural gas distribution stations, city gate stations, etc., and discloses a method and device for recycling and utilizing the pressure energy of the natural gas pipeline network in the field of gas turbine work

However, propane is used as refrigerant in the process of hydrate formation, storage and transportation, which increases the cost

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