CN211204067U - Waste heat recovery system of natural gas incineration device for ship - Google Patents
Waste heat recovery system of natural gas incineration device for ship Download PDFInfo
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- CN211204067U CN211204067U CN201921977647.4U CN201921977647U CN211204067U CN 211204067 U CN211204067 U CN 211204067U CN 201921977647 U CN201921977647 U CN 201921977647U CN 211204067 U CN211204067 U CN 211204067U
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Abstract
The utility model discloses a boats and ships natural gas burns device waste heat recovery system, including first economizer, second economizer, steam pocket, steam turbine generating set, relief valve, temperature sensor, gaseous composition sensor, condenser and hot-well, first economizer is installed on the blast pipe of natural gas burning tower, the second economizer is installed on the blast pipe of propulsion host computer, the blast pipe of natural gas burning tower is provided with temperature sensor and gaseous composition sensor in the end, install the relief valve on the blast pipe of natural gas burning tower. The utility model discloses a temperature sensor realizes burning the control and the feedback of tower exhaust temperature to the natural gas, burns the control and the feedback of tower exhaust composition to the natural gas through the gaseous composition sensor realization, realizes burning the protection of tower blast pipe to first economic ware and natural gas through the relief valve, and the good reliability, economic nature is good, and the routine maintenance cost is extremely low.
Description
Technical Field
The utility model belongs to the technical field of marine engineering equips, concretely relates to boats and ships natural gas burns device waste heat recovery system.
Background
The natural gas is a novel energy source replacing coal and petroleum by the characteristics of cleanness, convenience and high heat value, and the proportion of the natural gas in a global energy consumption structure is higher and higher, the natural gas transportation form mainly comprises pipeline gas and liquefied natural gas (L NG), L NG is a main means for guaranteeing natural gas supply in the future, a large L NG transport ship is known as 'bright pearl on the imperial crown', is a special ship for transporting liquefied natural gas at the temperature of 163 ℃ below zero and represents the highest technical level of commercial ships in the world, a natural gas incineration tower is a typical device on a L NG ship, can carry out thermal oxidation treatment on various gases such as steam, mixed gas in replacement of a liquid cargo hold and inerting in the transportation process of the L NG ship, ensures the pressure stability and safety of the liquid cargo hold, and reduces the emission of carbon-hydrogen gas under various operations of the L NG ship to the lowest, thereby having outstanding environmental protection performance.
L NG ship needs to cool the cargo tank before reaching the liquefied natural gas production shore station to load L NG, the deep cooling L NG at the bottom of the cargo tank is sprayed in the cargo tank, the temperature of the cargo tank is reduced from-130 ℃ to-163 ℃, so that the amount of evaporated gas in the cargo tank is rapidly increased, the pressure of the tank is increased, a large amount of evaporated gas needs to be conveyed to a natural gas burning tower to burn in order to ensure the pressure of the cargo tank to be stable, the evaporated gas needs to be conveyed to the natural gas burning tower to be processed in several days after the cargo loading of the L NG production shore station is completed, because the temperature of L NG in the cargo tank is not stable enough, a large amount of evaporated gas in the cargo tank appears, the exhausted gas after the combustion of the natural gas evaporated gas in the natural gas burning tower is directly discharged to the outside atmosphere, the temperature usually reaches nearly 500 ℃, a large amount of heat energy waste is caused, and the high-temperature exhausted gas also has certain influence on the.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a boats and ships natural gas burns device waste heat recovery system, the utility model discloses can burn the carminative heat in the tower to the natural gas and retrieve, turn into the electric energy and utilize, reduce gaseous discharge temperature.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a waste heat recovery system of a ship natural gas burning device, which comprises a first economizer, a second economizer, a steam pocket, a steam turbine generator set, a safety valve, a temperature sensor, a gas composition sensor, a condenser and a hot well, wherein the first economizer is arranged on an exhaust pipe of a natural gas burning tower, the second economizer is arranged on an exhaust pipe of a propulsion host, the exhaust pipe of the natural gas burning tower is provided with the temperature sensor and the gas composition sensor at the tail end, the safety valve is arranged on the exhaust pipe of the natural gas burning tower,
the first economizer comprises a first evaporator and a first superheater, the second economizer comprises a second evaporator and a second superheater, a saturated water outlet of the steam drum is connected with a first three-way valve, the first three-way valve is respectively connected with inlets of the first evaporator and the second evaporator through a first saturated water conveying pipeline and a second saturated water conveying pipeline, a first circulating pump and a second circulating pump are respectively arranged on the first saturated water conveying pipeline and the second saturated water conveying pipeline, an outlet of the first evaporator is connected with a second three-way valve through a first steam-water conveying pipeline, an outlet of the second evaporator is connected with a second three-way valve through a second steam-water conveying pipeline, the second three-way valve is connected with a steam-water inlet of the steam drum, a steam outlet of the steam drum is connected with a third three-way valve, and the third three-way valve is respectively connected with the first steam conveying pipeline and the second superheater, Second steam conveying pipe connects the entry of first over heater, second over heater, first over heater the export of second over heater all is connected steam turbine generating set, steam turbine generating set connects the condenser, the condenser is connected the hot well, the hot well is through the delivery connection of the thermal condensation water inlet of steam pocket, install feed water pump and air-vent valve on the delivery pipe of thermal condensation water.
As a preferred technical scheme, the steam turbine generator set comprises a steam turbine, a speed regulating gear box and an alternating current generator, wherein the outlets of the first superheater and the second superheater are connected with the steam turbine, the steam turbine is connected with the speed regulating gear box through an elastic coupling, and the speed regulating gear box is connected with the alternating current generator through an elastic coupling.
As a preferred technical scheme, the condenser is a shell-and-tube heat exchanger, and seawater or fresh water is used as a cooling medium.
Preferably, the pressure regulating valve is an electric pressure regulating valve or a pneumatic pressure regulating valve.
As a preferable technical scheme, the circulating pump is controlled by adopting variable-frequency driving.
Compared with the prior art, the beneficial effects of the utility model are that the utility model discloses a boats and ships natural gas burns device waste heat recovery system, through the produced used heat of natural gas burning tower exhaust and propulsion host computer on the recycle L NG boats and ships, and through heating vaporization intermediate medium water, utilize high-pressure superheated steam drive steam turbine generating set its messenger alternator to generate electricity, effectively improved the energy utilization of whole ship, simultaneously greatly reduced the exhaust temperature of natural gas burning tower, reduce L NG ship to the influence of surrounding environment, promote environmental friendliness the utility model discloses the system structure design is ripe, one set of steam turbine generating set of natural gas burning tower and propulsion host computer sharing, the good reliability, economic nature is good, and the daily maintenance cost is extremely low, realizes the control and the feedback to natural gas burning tower exhaust temperature through temperature sensor, realizes the control and the feedback to natural gas burning tower exhaust composition (including methane and other hydrocarbon, carbon dioxide, oxysulfide, nitrogen oxide etc.) through gas composition sensor, realizes the protection to first economic ware and natural gas burning tower blast pipe through the relief valve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the overall structure schematic diagram of the waste heat recovery system of the natural gas incineration device for the ship of the utility model.
Wherein the reference numerals are specified as follows: the system comprises a natural gas incineration tower 1, a propulsion host machine 2, a safety valve 3, a temperature sensor 4, a gas component sensor 5, a first economizer 6, a first evaporator 7, a first superheater 8, a second economizer 9, a second evaporator 10, a second superheater 11, a first three-way valve 12, a second three-way valve 13, a third three-way valve 14, a steam pocket 15, a first saturated water conveying pipeline 16, a first steam conveying pipeline 17, a first steam conveying pipeline 18, a second saturated water conveying pipeline 19, a second steam conveying pipeline 20, a second steam conveying pipeline 21, a first circulating pump 22, a second circulating pump 23, a steam turbine generator set 24, a heat condensate conveying pipeline 25, a hot well 26, a supply water pump 27, a pressure regulating valve 28, a condenser 29, a steam turbine 30, a speed regulating gear box 31 and an alternating current generator 32.
Detailed Description
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the present embodiment provides a waste heat recovery system for a natural gas burning tower of a ship, which includes a first economizer 6, a second economizer 9, a steam drum 15, a steam turbine generator set 24, a safety valve 3, a temperature sensor 4, a gas composition sensor 5, a condenser 29 and a hot well 26, wherein the first economizer 6 is installed on an exhaust pipe of the natural gas burning tower 1, the second economizer 9 is installed on an exhaust pipe of a propulsion main machine 2, the temperature sensor 4 and the gas composition sensor 5 are installed at the tail end of the exhaust pipe of the natural gas burning tower 1, and the safety valve 3 is installed on the exhaust pipe of the natural gas burning tower 1. The temperature sensor 4 realizes the monitoring and feedback of the exhaust temperature of the natural gas burning tower 1, the gas component sensor 5 realizes the monitoring and feedback of the exhaust components (including methane and other hydrocarbons, carbon dioxide, oxysulfide, nitrogen oxides and the like) of the natural gas burning tower 1, the safety valve 3 realizes the protection of the first economizer 6 and the exhaust pipe of the natural gas burning tower 1, and the safety valve 3 can be replaced by a rupture disk.
The first economizer 6 comprises a first evaporator 7 and a first superheater 8, the second economizer 9 comprises a second evaporator 10 and a second superheater 11, a saturated water outlet of a steam drum 15 is connected with a first three-way valve 12, the first three-way valve 12 is respectively connected with inlets of the first evaporator 7 and the second evaporator 10 through a first saturated water conveying pipeline 16 and a second saturated water conveying pipeline 19, the first saturated water conveying pipeline 16 and the second saturated water conveying pipeline 19 are respectively provided with a first circulating pump 22 and a second circulating pump 23, an outlet of the first evaporator 7 is connected with a second three-way valve 13 through a first steam-water conveying pipeline 17, an outlet of the second evaporator 10 is connected with a second three-way valve 13 through a second steam-water conveying pipeline 20, the second three-way valve 13 is connected with a steam-water inlet of the steam drum 15, a steam outlet of the steam drum 15 is connected with a third three-way valve 14, and the third three-way valve 14 is respectively connected with the first steam conveying pipeline 18 and the second superheater 11, The second steam conveying pipe 21 is connected with inlets of the first superheater 8 and the second superheater 11, outlets of the first superheater 8 and the second superheater 11 are connected with a steam turbine generator set 24, the steam turbine generator set 24 is connected with a condenser 29, the condenser 29 is connected with a heat well 26, the heat well 26 is connected with a heat condensate water inlet of the steam pocket 15 through a heat condensate water conveying pipe 25, and a water supply pump 27 and a pressure regulating valve 28 are installed on the heat condensate water conveying pipe 25.
The steam turbine generator set 24 comprises a steam turbine 30, a speed regulating gear box 31 and an alternating current generator 32, the outlets of the first superheater 8 and the second superheater 11 are connected with the steam turbine 30, the steam turbine 30 is connected with the speed regulating gear box 31 through an elastic coupling, the speed regulating gear box 31 is connected with the alternating current generator 32 through the elastic coupling, and the steam turbine 30, the speed regulating gear box 31 and the alternating current generator 32 are integrated on a common base.
The condenser 29 is a shell-and-tube heat exchanger, and seawater or fresh water is used as a cooling medium.
The pressure regulating valve 28 is an electric pressure regulating valve or a pneumatic pressure regulating valve.
The water supply pump 27 adopts variable frequency drive control, and realizes the flow control function of the outlet of the circulating pump according to the temperature signal fed back by the temperature sensor 4. The first circulating pump 22 and the second circulating pump 23 are both centrifugal, and the electric motor drives the water pump and is in fixed-frequency driving control.
The design pressure of the first economizer 6, the second economizer 9, the steam drum 15, the first circulating pump 22 and the second circulating pump 23 is high pressure (7-9 barg), and a high-pressure steam system is formed. The steam system can also be added with a low-pressure steam system, the economizer is added with a low-pressure module (comprising a low-pressure evaporator and a low-pressure superheater), a low-pressure steam drum and a low-pressure circulating pump are added, the design pressure is (3-5 barg), and low-pressure superheated steam directly enters the steam turbine.
The waste heat recovery system of the natural gas incineration tower 1 can be applied to not only liquefied natural gas transport ships, but also other ship types for installing the natural gas incineration tower 1, such as ethane transport ships, L NG filling ships, L NG floating storage regasification devices and the like.
The working process is as follows: taking the natural gas incineration tower 1 as an example, one end of the first three-way valve 12 connected to the first saturated water transport pipe 16 is opened, one end of the second three-way valve 13 connected to the first steam transport pipe 17 is opened, and one end of the third three-way valve 14 connected to the first steam transport pipe 18 is opened.
Step 1, saturated water with the pressure of about 1.0MPa and the temperature of about 175 ℃ comes out of a steam drum 15, enters a first evaporator 7 part in a first economizer 6 through a first circulating pump 22 (with the pressure of about 0.3MPa), forms a mixture of saturated water and saturated water vapor after being heated by exhaust gas of a natural gas burning tower 1, carries out steam-water separation after the mixture enters the steam drum 15, enters a first superheater 8 part in the first economizer 6 again, and forms high-pressure superheated water vapor (with the pressure of about 0.98MPa and the temperature of about 300 ℃) after being heated by the exhaust gas of the natural gas burning tower 1.
And 2, allowing the high-pressure superheated steam in the step 1 to enter the steam turbine 30 and push the steam turbine 30 to rotate at the rotating speed of about 10000 rpm, and reducing the rotating speed to 1800 rpm through the speed regulating gearbox 31 to drive the alternating current generator 32 to generate electric energy.
And 3, after the high-pressure superheated steam drives the steam turbine 30 to do work in the step 2, low-temperature negative-pressure steam with the pressure of 0.005MPa and the temperature of 40 ℃ is formed, enters the condenser 29 to form normal-pressure condensate (with the pressure of about 0.1MPa and the temperature of about 80 ℃) and is discharged to the hot well 26.
In the step 4 and the step 3, the normal pressure condensed water is heated to 120 ℃ in the hot well 26, pressurized by the water supply pump 27 (the pressure is about 1.4MPa), adjusted to 1.0MPa by the pressure regulating valve 28, enters the steam drum 15, and enters the next cycle.
The utility model discloses a natural gas burns 1 waste heat recovery system of tower for liquefied natural gas transport ship is gone up the waste heat in the natural gas burns 1 exhaust of tower through recycle L NG boats and ships to through heating vaporization intermediate medium water, utilize high-pressure superheated steam drive turbine to make alternator 32 generate electricity, effectively improved the energy utilization of whole ship, simultaneously, greatly reduced natural gas burns the exhaust temperature of tower 1, reduces L NG ship to the influence of surrounding environment, promotes environment friendship.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention can be made without departing from the spirit and scope of the present invention, and these modifications and improvements are within the spirit and scope of the present invention.
Claims (5)
1. A waste heat recovery system of a natural gas burning device of a ship is characterized by comprising a first economizer, a second economizer, a steam pocket, a steam turbine generator set, a safety valve, a temperature sensor, a gas composition sensor, a condenser and a hot well, wherein the first economizer is arranged on an exhaust pipe of a natural gas burning tower, the second economizer is arranged on an exhaust pipe of a propulsion host, the tail end of the exhaust pipe of the natural gas burning tower is provided with the temperature sensor and the gas composition sensor, the safety valve is arranged on the exhaust pipe of the natural gas burning tower,
the first economizer comprises a first evaporator and a first superheater, the second economizer comprises a second evaporator and a second superheater, a saturated water outlet of the steam drum is connected with a first three-way valve, the first three-way valve is respectively connected with inlets of the first evaporator and the second evaporator through a first saturated water conveying pipeline and a second saturated water conveying pipeline, a first circulating pump and a second circulating pump are respectively arranged on the first saturated water conveying pipeline and the second saturated water conveying pipeline, an outlet of the first evaporator is connected with a second three-way valve through a first steam-water conveying pipeline, an outlet of the second evaporator is connected with a second three-way valve through a second steam-water conveying pipeline, the second three-way valve is connected with a steam-water inlet of the steam drum, a steam outlet of the steam drum is connected with a third three-way valve, and the third three-way valve is respectively connected with the first steam conveying pipeline and the second superheater, Second steam conveying pipe connects the entry of first over heater, second over heater, first over heater the export of second over heater all is connected steam turbine generating set, steam turbine generating set connects the condenser, the condenser is connected the hot well, the hot well is through the delivery connection of the thermal condensation water inlet of steam pocket, install feed water pump and air-vent valve on the delivery pipe of thermal condensation water.
2. The waste heat recovery system of the natural gas incineration device of the ship as claimed in claim 1, wherein the steam turbine generator set comprises a steam turbine, a speed regulating gear box and an alternating current generator, the outlets of the first superheater and the second superheater are connected with the steam turbine, the steam turbine is connected with the speed regulating gear box through an elastic coupling, and the speed regulating gear box is connected with the alternating current generator through an elastic coupling.
3. The waste heat recovery system of the natural gas incineration device of the ship as claimed in claim 1, wherein the condenser is a shell and tube heat exchanger using seawater or fresh water as a cooling medium.
4. The waste heat recovery system of the natural gas incineration device of the ship as claimed in claim 1, wherein the pressure regulating valve is an electric pressure regulating valve or a pneumatic pressure regulating valve.
5. The waste heat recovery system of the natural gas incineration device of the ship as claimed in claim 1, wherein the circulation pump is controlled by a variable frequency drive.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921977647.4U CN211204067U (en) | 2019-11-15 | 2019-11-15 | Waste heat recovery system of natural gas incineration device for ship |
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| CN201921977647.4U CN211204067U (en) | 2019-11-15 | 2019-11-15 | Waste heat recovery system of natural gas incineration device for ship |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886632A (en) * | 2019-11-15 | 2020-03-17 | 沪东中华造船(集团)有限公司 | Waste heat recovery system of ship natural gas incineration tower |
| CN114988364A (en) * | 2022-06-13 | 2022-09-02 | 重庆科技学院 | Power generation system based on natural gas hydrogen production and fuel cell technology |
-
2019
- 2019-11-15 CN CN201921977647.4U patent/CN211204067U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886632A (en) * | 2019-11-15 | 2020-03-17 | 沪东中华造船(集团)有限公司 | Waste heat recovery system of ship natural gas incineration tower |
| CN114988364A (en) * | 2022-06-13 | 2022-09-02 | 重庆科技学院 | Power generation system based on natural gas hydrogen production and fuel cell technology |
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