KR20160148408A - Preheating apparatus for waste pressure power generation of NG supply pipeline - Google Patents

Preheating apparatus for waste pressure power generation of NG supply pipeline Download PDF

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Publication number
KR20160148408A
KR20160148408A KR1020150085435A KR20150085435A KR20160148408A KR 20160148408 A KR20160148408 A KR 20160148408A KR 1020150085435 A KR1020150085435 A KR 1020150085435A KR 20150085435 A KR20150085435 A KR 20150085435A KR 20160148408 A KR20160148408 A KR 20160148408A
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KR
South Korea
Prior art keywords
gas
chamber
preheating
power generation
oil
Prior art date
Application number
KR1020150085435A
Other languages
Korean (ko)
Inventor
차영만
Original Assignee
주식회사 코마
차영만
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Filing date
Publication date
Application filed by 주식회사 코마, 차영만 filed Critical 주식회사 코마
Priority to KR1020150085435A priority Critical patent/KR20160148408A/en
Publication of KR20160148408A publication Critical patent/KR20160148408A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
    • F01D1/18—Non-positive-displacement machines or engines, e.g. steam turbines without stationary working-fluid guiding means
    • F01D1/22—Non-positive-displacement machines or engines, e.g. steam turbines without stationary working-fluid guiding means traversed by the working-fluid substantially radially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C1/00—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid
    • F02C1/02—Gas-turbine plants characterised by the use of hot gases or unheated pressurised gases, as the working fluid the working fluid being an unheated pressurised gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/28—Arrangement of seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/046—Enhancing energy recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The present invention relates to an apparatus to preheat gas of waste pressure power generation in a natural gas supply system, comprising: a turbo expander (10) causing rotation of a turbine (15) by gas flowing to an outlet hole (13) from an inlet hole (12) of a casing (11); a power generation means (20) to perform power generation by rotary power of a shaft (22) combined with the turbine (15) in a chamber (21) formed in the casing (11); a sealing lubrication means (30) to perform lubrication in a sealed state in the chamber (21); and a preheating means (40) combusting oil of the sealing lubrication means (30) and the gas to apply calories to the gas passing the outlet hole (13). Accordingly, since electricity is produced by using pressure wasted in a system to decompress and supply natural gas, economical efficiency is enhanced due to preheating utilizing waste resources of the wasted oil and gas.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a preheating apparatus for a natural gas supply system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear power generation system, and more particularly, to a preheating apparatus for a natural gas supply system waste power generation system for generating electricity using a pressure to be discarded in a system for reducing natural gas.

Typically, liquefied natural gas (LNG) is stored at a cryogenic temperature and is supplied to a local supplier (City Gas Company) through a nationwide main pipeline after high pressure gasification. The supplier receives the decompressed natural gas from the supply station, and after decompression, supplies it to the customers such as power plant, industry, and general household. Because of the significant amount of energy being discarded in these natural gas supply systems, there is a growing interest in recovering these.

Korean Patent Registration No. 1450922 (Prior Art 1) and Japanese Patent Laid-Open Publication No. 2014-139918 (Prior Art 2) are known as prior art documents which can be referred to in this connection.

A machine for recovering power from a flow of compressed gas, comprising: a turbo-inflator having a turbo-inflator wheel; and a generator having a rotor and a stator, said rotor being connected to the turbo- The turbo-expander and the rotor are housed in a pipe of a predetermined length, and the front surface of the turbo-inflator wheel faces a generator. Therefore, it is expected that the efficiency of cooling and preheating of the main part is improved.

According to the prior art document 2, the power generation system further includes a fuel cell power generation apparatus while being configured to lower the pressure of the preheated high-pressure gas, the fuel cell power generation apparatus is configured to generate an electric output while generating waste heat, And is configured to be able to heat the high-pressure gas using waste heat. Accordingly, it is expected that the energy generated when the gas pressure is lowered contributes to the improvement of the efficiency of the system.

However, since the above-mentioned prior art does not consider the design factors related to the heat source of the preheater, there is room for improvement for improving the economical efficiency of the overall system.

1. Korean Patent Registration No. 1450922 entitled "Power Recovery Machine" (Published on June 3, 2009) 2. JP-A-2014-139918 "Fuel cell hybrid power generation system and method for gas delivery system" (Published on July 31, 2014)

It is an object of the present invention to overcome the above-mentioned problems of the prior art by providing a method of reducing the temperature of a natural gas by using a waste gas, And to provide a preheating device for the natural gas supply system waste pressure power generation to be performed.

In order to achieve the above object, the present invention provides an apparatus for preheating gas of a nuclear power generation system in a natural gas supply system, comprising: a turboexpander for causing rotation of the turbine by gas flowing from an inlet to an outlet of the casing; Power generating means for generating electric power by a rotational force of a shaft coupled with a turbine in a chamber formed in the casing; Seal lubrication means for performing lubrication in a sealed state in the chamber; And preheating means for burning oil and gas of the sealing lubricating means to add heat to the gas passing through the discharge port.

As a detailed configuration of the present invention, the power generation means supports the end portion of the shaft through a bearing and a mechanical seal in a chamber.

As a detailed configuration of the present invention, the sealing lubricating means supplies lubrication oil through the oil feed pipe connected to the chamber and the rapid fluid.

In the detailed construction of the present invention, the preheating means is characterized in that the preheating means connects the return pipe to the chamber to send the oil and gas to the combustor, and the combustion heat is transferred by connecting the burner and the outlet with the heating pipe.

As a modification of the present invention, the recovery pipe is provided with an on-off valve for interrupting the flow path in accordance with the oil level of the chamber.

As a modification of the present invention, the heating tube is connected to a heating tube for providing external heat through a three-way valve.

As a detailed configuration of the present invention, the preheating means is characterized by having a heat exchanger for gas preheating on the outlet of the casing.

As described above, according to the present invention, there is an effect of enhancing the economical efficiency by performing the preheating by utilizing the waste resources of the oil and the gas, which are discarded in producing electricity using the pressure to be discarded in the system for supplying natural gas under reduced pressure.

1 is a block diagram schematically showing a waste pressure preheating apparatus according to the present invention;
2 is a block diagram schematically showing a preheating apparatus according to a modification of the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention proposes an apparatus for preheating a gas of a nuclear power generation plant in a natural gas supply system. The natural gas supply system refers to all the pipelines connected to the power plant, industrial, home and commercial through the supply station (KOGAS) and the supplier (city gas company) at the production base. The natural gas supply system in connection with pulmonary pressure generation is illustrated, but is not necessarily limited to.

According to the present invention, the turboexpander 10 is a structure that causes the rotation of the turbine 15 by the gas flowing from the inlet 12 to the outlet 13 of the casing 11. The radial flow system in which the turbine 15 and the shaft 22 are disposed in a direction orthogonal to the gas flow in FIG. 1 is illustrated, but the present invention is not limited thereto. The natural gas is reduced to the load of the turbine 15 while flowing to the inlet 12 and the outlet 13 of the casing 11 connected to the supply system. The range of decompression of natural gas is changed according to the design and operation conditions of the supply station and the supplier, and the amount of waste pressure generated is also proportionally set. In any case, it involves a preheating process in which the gas in the discharge port 13 is maintained at a set temperature (for example, 0 DEG C or higher).

According to the present invention, the power generating means 20 generates power by the rotational force of the shaft 22 coupled with the turbine 15 in the chamber 21 formed in the casing 11. The power generation means 20 includes a rotor 25 having a permanent magnet and a stator 26 having a coil. The rotor 25 is installed on the shaft 22 inside the casing 11 and is installed outside the casing 11 of the stator 26 so as to face the rotor 25. The chamber 21 is formed at both ends of the casing 11 to receive both ends of the shaft 22 and the rotor 25. The gas flow pressure causes the turbine 15 and the shaft 22 to rotate and power is generated at the stator 26.

The power generating means 20 supports the end portion of the shaft 22 via the bearing 23 and the mechanical seal 32 in the chamber 21. In this case, The chamber 21 is formed in a structure isolated from the casing 11 to enhance the durability of the bearing 23 and the rotor 25 accommodated therein. A mechanical seal 32 is provided on the isolating member of the casing 11 and the chamber 21 to enhance the sealability. The high pressure natural gas flowing through the casing 11 leaks to the mechanical seal 32 and is filled in the chamber 21. [ The leaked gas can be utilized as a heat source of the preheating means 40 described later.

Further, according to the present invention, the sealing lubricating means 30 performs the lubrication in the sealed state in the chamber 21. The sealing lubrication means 30 lubrication to the bearing 23 improves the operability and durability and is selected from among various systems such as dump lubrication, circulation lubrication, lubrication lubrication, and lubrication lubrication considering the power generation load of the power generation means 20 . The oil to be replaced or discarded can be utilized as a heat source for the preheating means 40 described later.

The sealing lubricating means 30 supplies the lubricating oil through the oil feed pipe 31 connected to the chamber 21 and the hydraulic fluid 35. In this case, 1, the circulation lubrication for connecting the oil feed pipe 31 and the hydraulic fluid 35 to the chamber 21 is illustrated but not limited thereto. The rapid fluid 35 includes piping elements such as a lubricating oil reservoir, a pump, a filter, and a valve.

According to the present invention, the preheating means (40) burns the oil and gas of the sealing lubricating means (30) and adds a heat quantity to the gas passing through the discharge port (13). The preheating means (40) allows the low temperature natural gas, which has been reduced in pressure through the turbine (15), to be supplied in a state where the natural gas is heated up to the customer. At this time, the amount of heat required is basically provided in the supply system, but it can be complementarily supplemented through the preheating means 40 of the present invention. This function sharing is determined by the amount of heat secured through the preheating means 40.

The preheating means 40 connects the return pipe 41 to the chamber 21 to send the oil and gas to the combustor 43 and the combustor 43 and the discharge port 13 to the heating pipe 43. [ (42) to transfer the calorific value of the combustion. In FIG. 1, the return pipe 41 connected to both chambers 21 is connected to the combustor 43 after merging. On the return pipe 41, a pump 47 for transferring oil and gas is provided. The burner 43 burns the oil and gas in the chamber 21 to raise the temperature of the heating medium and the heating medium transfers the amount of heat of combustion to the outlet 13 side through the heating tube 42. When water is used as the heating medium, the steam is transferred to the heating pipe (42).

The recovery pipe 41 is provided with an on-off valve 38 for interrupting the flow passage corresponding to the oil level of the chamber 21. 2, a level sensor 37 is provided in the chamber 21 to supply the lubricant to the combustor 43 in a state that the lubricant is filled in a predetermined amount. The open / close valve (38) is provided upstream of the recovery pipe (41) and only opens when the amount of lubricating oil is sufficient.

On the other hand, a pressure sensor (not shown) may be provided in the chamber 21 together with the level sensor 37 to open the flow path of the recovery pipe 41 when the charged gas pressure exceeds the set value.

The heating pipe 42 is connected to the heating pipe 44 through a three-way valve 48 to provide an external heat quantity. The heating pipe 44 is a flow path for transferring the heating medium heated by the heat source of the supply system, and can be constructed so as to fundamentally and constantly support the preheating load. In this case, only the heat medium of the symbol 42 and the heat medium of the symbol 44 are used for the preheating through the three-way valve 48.

As another modification, the heating medium of the numeral 42 and the heating medium of the numeral 44 may be configured to be mixed at a mutually set ratio through the flow rate control. Generally, the supply and demand of natural gas varies depending on the season, the day, and the time. Despite such fluctuation factors, the preheating function by the preheating means 40 can be stably performed when a plurality of the heating pipes 42 and 44 are utilized.

The preheating means 40 is characterized in that it has a heat exchanger 45 for preheating gas on the discharge port 13 of the casing 11. [ The heat exchanger (45) is installed on the discharge port (13) of the casing (11) and performs heat exchange between the heating medium and the natural gas. The heat exchanger 45 is selected to perform a natural gas decompression function in conjunction with the turbine 15, though not limited to a particular type.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: turboexpander 11: casing
12: inlet 13: outlet
15: turbine 20: generator means
21: chamber 22: shaft
23: bearing 25: rotor
26: Stator 30: Sealing lubrication means
31: Oil feed pipe 32: Mechanical seal
35: Rapid fluid 37: Level sensor
38: opening / closing valve 40: preheating means
41: recovery pipe 42, 44: heating pipe
43: combustor 45: heat exchanger
47: Pump 48: 3-way valve

Claims (7)

CLAIMS 1. An apparatus for preheating gas of a nuclear power generation plant in a natural gas supply system, comprising:
A turboexpander (10) for causing rotation of the turbine (15) by gas flowing from the inlet (12) to the outlet (13) of the casing (11);
Generating means 20 for performing power generation by the rotational force of a shaft 22 coupled with a turbine 15 in a chamber 21 formed in the casing 11;
Sealing lubrication means (30) for performing lubrication in a sealed state in the chamber (21); And
And a preheating means (40) for burning the oil and gas of the sealing lubricating means (30) and adding heat to the gas passing through the discharge port (13). . The method according to claim 1,
Wherein the power generating means (20) supports the end of the shaft (22) via a bearing (23) and a mechanical seal (32) in the chamber (21). The method according to claim 1,
Wherein the sealing lubricating means (30) supplies the lubricating oil through the oil feed pipe (31) connected to the chamber (21) and the feed fluid (35). The method according to claim 1,
The preheating means 40 connects the return pipe 41 to the chamber 21 to send the oil and gas to the combustor 43 and the combustor 43 and the discharge port 13 to the heating pipe 42, Wherein the heat transfer unit transfers heat of the natural gas supply system. The method of claim 4,
Wherein the return pipe (41) is provided with an on-off valve (38) for interrupting the flow path in accordance with the oil level of the chamber (21). The method of claim 4,
Wherein the heating pipe (42) is connected via a three-way valve (48) and a heating pipe (44) for providing an external heat quantity. The method according to claim 1,
Wherein the preheating means (40) comprises a heat exchanger (45) for gas preheating on the discharge port (13) of the casing (11).
KR1020150085435A 2015-06-16 2015-06-16 Preheating apparatus for waste pressure power generation of NG supply pipeline KR20160148408A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114165293A (en) * 2021-12-06 2022-03-11 重庆科技学院 Closed double-rotor natural gas pipeline power generation device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014139918A (en) 2006-05-16 2014-07-31 Fuelcell Energy Inc Fuel battery hybrid power generation system and method for gas delivery system
KR101450922B1 (en) 2006-09-12 2014-10-14 크라이오스타 에스아에스 Power recovery machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014139918A (en) 2006-05-16 2014-07-31 Fuelcell Energy Inc Fuel battery hybrid power generation system and method for gas delivery system
KR101450922B1 (en) 2006-09-12 2014-10-14 크라이오스타 에스아에스 Power recovery machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114165293A (en) * 2021-12-06 2022-03-11 重庆科技学院 Closed double-rotor natural gas pipeline power generation device
CN114165293B (en) * 2021-12-06 2023-05-16 重庆科技学院 Closed birotor natural gas pipeline power generation device

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