WO2018214231A1

WO2018214231A1 - Multifunctional lng floating power generation unit using gas-steam combined cycle

Info

Publication number: WO2018214231A1
Application number: PCT/CN2017/090749
Authority: WO
Inventors: 张宗强; 周翔; 满堂泉; 王彤; 唐丰; 周志清; 龙建清; 何浪; 景士海
Original assignee: 惠生（南通）重工有限公司
Priority date: 2017-05-26
Filing date: 2017-06-29
Publication date: 2018-11-29
Also published as: CN107905861A

Abstract

A multifunctional LNG floating power generation unit using a gas-steam combined cycle. The unit comprises a vessel-shaped floating body (1). A transformer chamber (101), a condensate storage tank (102), and LNG storage tanks (103) are disposed in the vessel-shaped floating body (1). A gasification heater (2), a first central pipeline (4), gas turbines (5), and a heat recovery steam generator (6) are installed on the deck. First and second heat exchange processes (201, 202) are arranged in the gasification heater (2). The LNG storage tanks (103) converge, by means of pipelines, on an input port of the first heat exchange process (201). An output port of the first heat exchange process (201) communicates with the first central pipeline (4). The first central pipe (4) divides and communicates with each gas turbine (5). A first generator (8) is coaxially connected to each gas turbine (5). The unit can be used on riverbanks, lakesides, or seasides, or on the deep sea, can supply electricity to a city, an industrial area, and a large platform or an offshore factory operating on the deep sea. The invention uses LNG to generate power on a dock, eliminating the need to lay a pipeline network and achieving low construction costs. The invention is stable in operation, has a high thermal energy utilization rate, and is environmentally friendly.

Description

Multifunctional LNG floating power generation device adopting gas-steam combined cycle

Technical field

The invention belongs to the field of LNG power generation, and particularly relates to a multifunctional LNG floating power generation device adopting a gas-steam combined cycle suitable for power supply in cities, industrial areas and large-scale structures on the rivers, lakes and seas and deep seas.

Background technique

At present, energy and low carbon efficiency has become the first choice for promoting sustainable development of the world economy and society. As an important clean energy source, natural gas is increasingly favored by users for its high quality, high efficiency and environmental protection. With the advancement of technology, the cost of mining, transportation, storage, etc. is declining, so its application range is expanding. Among the three fossil energy sources of coal, oil and natural gas, natural gas has the lowest hydrogen content, high thermal energy utilization efficiency, and the highest calorific value under the same quality conditions, and carbon emissions are only half of that of coal.

The developed countries of the United States, Japan, South Korea and Europe have used natural gas as one of the main sources of power generation. Because natural gas power plants are easier to build, lower in cost, and emit less than coal-fired power stations, the proportion of natural gas power generation in the United States has increased significantly, from about 11% in 1990 to 23.9% in 2010, forming natural gas. In place of coal, the proportion of coal power generation fell from 52% in 2000 to 39% in 2013. The proportion of natural gas power generation in Japan to total power generation increased from 15% in 1980 to 43% in 2013. As of 2014, the installed capacity of LNG power generation in Japan accounted for more than 65% of the total installed capacity of power generation. With the opening of the UK's competitive power market reform and the day of gas-steam combined cycle power generation technology It has matured and natural gas power generation has developed rapidly. In 2014, the installed capacity of natural gas power generation was 33.784 million kW, accounting for 39.75% of the country's total installed capacity.

At present, China's coal-fired power generation accounts for more than 60% of the total. Air pollution is already a serious problem facing the country. With the release of the State Council's Action Plan for Air Pollution Prevention and Control, the policy of “big and small” has been adopted in the field of coal-fired power construction. For example, the above-mentioned highest-tech ultra-supercritical generator set adopted by the overseas Gaoqiao No. 3 Power Plant is the highest net efficiency of 46.5% due to the inevitable hot end loss of coal-fired power. However, compared with the current F-class gas turbines produced by international top gas turbine manufacturers such as GE and Siemens, the efficiency of gas-steam combined cycle power generation is more than 60%.

China's natural gas power generation is still in its infancy. At the beginning of the 21st century, with the large-scale construction of infrastructure such as natural gas pipelines, the natural gas power generation industry has made certain progress. By the end of 2015, China's gas power generation installed capacity was about 66.37 million kW, accounting for 4.45% of the country's total installed power capacity, and natural gas power generation was 165.8 billion kW·h, accounting for 2.95% of the country's total power generation, far below the world average. . In addition to resource endowments, the factors that restrict the development of China's natural gas power generation industry are also the reasons for the backwardness of technical equipment. At present, Shanghai Electric, Dongfang Electric, Harbin Electric and other domestic companies with strong foundations in the gas turbine field have cooperated with international gas turbine giants to introduce domestically produced gas-steam combined cycle generator sets by means of technology introduction, which has effectively promoted natural gas power generation in China. pace of. The construction of land-based natural gas power plants is subject to the laying of natural gas pipeline networks, while the main electricity-using economic zones on the eastern coast of China have vast marine water resources, and LNG carriers can easily shuttle through these waters. The use of equipment, so the use of its water resources to develop floating power plants has a good prospect.

Summary of the invention

The object of the present invention is to provide a natural gas power plant in the prior art which is subject to the laying of a natural gas pipeline network and currently does not use its water resources to develop a floating power generating device, and provides a kind of river water, sea and sea coast or far-reaching. The sea can supply electricity to cities, industrial areas and large platforms or offshore plants operating in the deep sea; LNG power generation on the docks, eliminating the laying of pipelines, and low-cost multi-function LNG floating with gas-steam combined cycle Power generation unit.

The technical solution adopted by the present invention to solve the technical problem thereof is: a multifunctional LNG floating power generation device adopting a gas-steam combined cycle, which comprises a ship type floating body, a transformer chamber, a condensate storage tank and a plurality of ships in the ship type floating body LNG storage compartment; a gasification heater, a first heat exchanger, a first central pipeline, a plurality of gas turbines and a plurality of waste heat boilers are installed on the deck of the floating body of the ship, and the gas turbine and the waste heat boiler are arranged one by one, the gasification heater a first heat exchange process and a second heat exchange process for performing mutual heat exchange are disposed therein, and the first heat exchanger is provided with a third heat exchange process and a fourth heat exchange process for performing heat exchange with each other;

Each LNG storage tank is provided with a deep submersible pump, and the deep submersible pump is collected through the pipeline to the input port of the first heat exchange process, and the output port of the first heat exchange process is connected to the inlet of the first central pipe, the first central pipe The outlet is branched into the air inlet of each gas turbine, and each gas turbine is coaxially connected with a first generator, and the power output ends of the first generators are all connected to the transformer room;

The exhaust gas discharge ports of each gas turbine are connected to the waste heat boiler one by one Each of the waste heat boilers is provided with a low-pressure steam circuit; the condensate storage tank is provided with a condensate transfer pump, and the pump outlet of the condensate transfer pump is branched through the pipeline to the inlet end of each low-pressure steam circuit, and the low-pressure steam circuit The steam outlets are collected into the inlet of the fourth heat exchange process through the pipeline, and the outlet of the fourth heat exchange process is connected to the condensate storage tank; the third heat exchange process and the second heat exchange process constitute a circulation loop, and the circulation loop There is a forced circulation pump in the middle, and there is a circulating medium.

The ship type floating body of the invention adopts the form of unpowered barge, which has the advantages of simple structure, low manufacturing cost, large internal space, and convenient arrangement of equipment pipes. Wherein, the internal space is arranged with a transformer chamber, a condensate storage tank and a plurality of LNG storage tanks; the deck is provided with a gasification heater, a first heat exchanger, a first central pipeline, a plurality of gas turbines and a plurality of waste heat boilers; thus the invention integrates High degree, small footprint, and can be towed to the dock at the designated location as needed, flexible and convenient. In addition, the construction and commissioning work of all the main bodies of the present invention can be completed at the shipyard, and then towed to a designated place, and the construction and debugging work does not affect the surrounding living environment.

Several LNG storage tanks can be installed in the ship type floating body, and each LNG storage tank is equipped with a deep submersible pump. During the operation of the device, the LNG in the LNG storage tank is input to the gasification heater through the deep submersible pump, and the natural gas generated after the gasification is input to the combustion chamber in each gas turbine for combustion work. The intake end of each gas turbine is coaxially connected to the first generator, and the exhaust end of each gas turbine is connected to a corresponding waste heat boiler, and the waste heat boiler uses the heat of the exhaust gas to heat the low pressure steam circuit. The low pressure steam in the low pressure steam circuit is input into the fourth heat exchange process in the first heat exchanger through the pipeline, and the low pressure steam and the third heat exchange flow in the fourth heat exchange process The heat medium of the process performs heat exchange, and the heat medium performs a closed cycle between the gasification heater and the first heat exchanger to transfer heat in the low pressure steam circuit to the gasification heater for gasification of LNG And heating. Among them, low-pressure steam can not be directly into the gasification heater for heating and vaporizing LNG. When low-pressure steam encounters low temperature, LNG will freeze and the equipment cannot operate. Therefore, it is necessary to set the gasification heater and the first heat exchanger through the intermediate heat medium. The heat transfer has the advantages of small volume, high efficiency, stable production, and the use of heat generated by the waste heat boiler to provide gasification heat energy to the LNG through the closed cycle heat medium. The low pressure steam after passing through the fourth heat exchange process becomes liquid water and is input to the condensate storage tank for storage. The water in the condensate storage tank is pumped into each waste heat boiler through a condensate transfer pump for heating, thereby forming a low pressure steam circuit. Finally, the electric power generated by each of the first generators is connected to the transformer chamber through a cable, and the transformed electric energy can be output to the outside.

Preferably, the first heat exchange process may be a shell process of the gasification heater, and the second heat exchange process may be a pipe process of the gasification heater; the heat energy utilization rate is high, and the internal cleaning is convenient.

Preferably, the third heat exchange process may be a shell process of the first heat exchanger, and the fourth heat exchange process may be a pipe process of the first heat exchanger, and the heat energy utilization rate is high.

The invention can be applied to a multi-function LNG floating power generation device using a gas-steam combined cycle with a ship-type floating body for a natural gas application or a deep sea environment, and the generated electric power can be connected to the power grid through a cable. Powering cities, industrial areas and large platforms or offshore plants operating in the deep sea. The construction of existing land-based natural gas power plants is subject to the natural gas pipeline network. Laying, the cost is very huge. Since the LNG power generation is directly carried out on the dock, the natural gas pipeline network can be omitted and the cost is low. The main electricity-using economic zone in the eastern coast of China has vast marine water resources, and the LNG carrier can conveniently shuttle in these waters and park on the side of the multi-function LNG floating power generation device using the gas-steam combined cycle of the present invention. The LNG is transported to the LNG floating power generation device of the present invention to generate electricity. Therefore, the use of its water resources to develop a floating power generation device has a good market prospect.

The gas-steam combined cycle generator set adopting the invention has high efficiency and stable operation, and the heat energy utilization rate is above 60%, and the large supercritical/ultra-supercritical thermal power generating unit is between 40-50%; the LNG energy source used For clean energy, the emissions are basically water and carbon dioxide, almost no nitrogen oxides and sulfides, no dust emission, and have far-reaching significance for environmental protection; the gas-steam combined cycle generator set is adopted, and the start-stop is rapid, which is extremely suitable for Power peaking.

Specifically, the deck of the ship type floating body is further provided with an LNG receiving platform for conveying the LNG on the LNG carrier outside the device through the pipe to the respective LNG storage tanks through the hose. The ship type floating body can be docked on the side of the dock. The LNG carrier is docked on the side of the ship type floating body, that is, the ship type floating body is located between the LNG carrier and the dock, making full use of the vast marine water resources, not occupying the land resources, and using its water resources to develop and float. Power plants have good prospects.

Specifically, a BOG compressor and a cooler are further disposed on the deck of the ship type floating body, and the top air chamber of each LNG storage tank is connected to the input port of the BOG compressor through a pipeline, and the output port of the BOG compressor is connected to the first through the cooler The progress of a central pipeline mouth. The naturally evaporating BOG is generated every day in the LNG storage tank, and the BOG in the ship type floating body of the present invention is input into the BOG compressor through the pipeline, the BOG compressor can be driven by the electric motor, and the compressed BOG enters the aftercooler to cool down. And then collected into a first central pipeline for collecting and transporting the BOG compression-cooled natural gas and the natural gas produced by the gasification, and the first central pipeline is branched into the intake ports of the respective gas turbines, and each gas turbine performs Burning work. The gas turbine has pressure and temperature requirements for the burned natural gas. After the compressed BOG reaches the pressure requirement, it will heat up. Therefore, the cooler is required to cool down to reach the combustion temperature requirement. Wherein, the condensate of the cooler is water, and the water can be cooled by a pump to extract fresh water or seawater outside the ship for single-cycle cooling. The invention also fully utilizes BOG for combustion power generation and improves energy utilization.

Further, the ship type floating body is further provided with a plurality of steam turbines, and each of the waste heat boilers is also provided with a high/intermediate pressure steam circuit, and the steam outlet ends of the high/intermediate pressure steam circuits are all connected through the pipeline in many-to-one or The one-to-one connection is connected to the steam inlet of each steam turbine, and the steam outlet end of the steam turbine is connected to the condensate storage tank through the condensing device, and the second generator is connected to the output shaft of the steam turbine, and the power of the second generator The output is also cabled to the transformer room; the transformer in the transformer room is a dry transformer, an oil immersed transformer or a gas insulated transformer. It is of course also possible to arrange the transformer on the deck according to requirements, and the power generated by the first generator and the second generator is transmitted through the cable to the transformer chamber for voltage transformation. This embodiment can be set differently according to the requirements of the power generation scale, but the basic principles are the same. Each gas turbine is coaxially connected to a first generator at the intake end, and is connected at the waste discharge end. A waste heat boiler, high/intermediate steam generated by multiple waste heat boilers is input to a steam turbine, and the steam turbine is connected to a second generator. This embodiment has a wide application range and is suitable for transformation of different power generation scales. The maximum power generation can reach 800 MW. The waste heat boiler of the embodiment can be selected as a three-pressure waste heat boiler, which can also generate high/intermediate pressure steam by utilizing exhaust heat of the exhaust gas in the gas turbine to drive the steam turbine to generate waste heat power. The high/medium pressure steam recovery heat recovery capability of the embodiment is strong. , further improving energy efficiency.

The number of gas turbines and waste heat boilers is several, and the number of steam turbines is several; specifically, one gas turbine + one waste heat boiler + one steam turbine is one-to-one configuration; two gas turbines + two Taiwan waste heat boiler + one steam turbine, that is, two tow one configuration; three gas turbines + three waste heat boilers + two steam turbines, that is, three tow two configuration; this embodiment can be based on different power generation scales and gas turbines The power matching relationship between the waste heat boiler and the steam turbine can adopt other different configurations, such as five to three, four to four or three tow.

Specifically, the multifunctional LNG floating power generation device further includes a plurality of deaerators, the deaerator and the waste heat boiler are in one-to-one correspondence, and the pump outlet of the condensate transfer pump is branched to each deaerator through the pipeline, and each deaerator Both are diverted through the pipeline to the inlet of the low pressure steam circuit and the high/intermediate pressure steam circuit in the corresponding waste heat boiler, and the steam inlet of the deaerator is connected with the outlet line of the low pressure steam circuit. The present invention removes oxygen from the water by steam heating of the water to avoid corrosion of the various devices in the apparatus at high temperatures.

Preferably, the multi-function LNG floating power generation device in the one-to-one mode is further included Including a deaerator, the deaerator is provided with a waste heat boiler, and the pump outlet of the condensate transfer pump is diverted through the pipeline to the deaerator, and the deaerator is diverted through the pipeline to the low pressure steam circuit and the high/medium in the waste heat boiler. The inlet of the pressure steam circuit, the steam inlet of the deaerator is connected to the outlet line of the low pressure steam circuit.

Specifically, a water supply pipe is connected to the pipeline between the pump outlet of the condensate transfer pump and the deaerator; the sewage outlet of the waste heat boiler is connected to the boiler sewage buffer tank through the pipeline, and the gas phase outlet of the boiler sewage buffer tank is connected to the pipeline through the pipeline to Each deaerator, the sewage outlet of the boiler sewage buffer tank is connected to the outside of the multifunctional LNG floating power generation device. There is water loss during the entire steam cycle, and the waste heat boiler will continuously replenish the lost water from the outside. Part of the sewage will be generated in the entire steam circuit. The sewage is discharged from the waste heat boiler into the boiler sewage buffer tank, part of the steam is returned to the deaerator, and the sewage is discharged from the boiler sewage buffer tank to ensure the cleaning and recycling of the water body. .

Specifically, the multifunctional LNG floating power generation device further includes a seawater desalination system, the seawater desalination system includes a seawater tank, and the seawater tank is connected with an inlet water pipe, and the seawater tank sequentially connects the ultrafiltration module, the ultrafiltration water production tank, and the seawater through the first pipeline. Reverse osmosis module, first-stage reverse osmosis water tank, secondary reverse osmosis module, desalinated water tank, deionization module and deionized water tank, deionized water tank is connected to the water inlet of the water supply pipe through the outlet pipe; the water outlet of the first reverse osmosis water tank The drinking water post-treatment module is connected through the second pipeline, and the water outlet of the drinking water after-treatment module is used for external drinking water; the first-stage reverse osmosis water tank is connected to the fresh water daily system through the third pipeline.

The invention produces three parts of water through the above seawater desalination system, that is, for drinking outside Water, hydration (deionized water) of the waste heat boiler of the daily fresh water and gas-steam combined cycle generator set of the floating power generation device of the present invention. The seawater from the seawater tank passes through the ultrafiltration module to produce clean seawater, reaches the water inlet requirement of the seawater reverse osmosis module and is transported to the seawater reverse osmosis module through the ultrafiltration water tank, and the primary fresh water is stored in the first-stage reverse osmosis water tank. A part of fresh water can be used in the fresh water daily system of the floating power generation device of the present invention. Most of the fresh water is supplied to the first-stage reverse osmosis water tank after the drinking water post-treatment module adjusts the pH, chlorination and minerals to reach the drinking water standard. The fresh water is dehydrated through the secondary reverse osmosis module and stored in a desalinated water tank. After deionization, the deionized water is prepared and stored in a deionized water tank for replenishing the waste heat boiler. The invention can fully utilize various resources on the floating power generation device, purify and dilute into a plurality of water resources for different needs, and can use the power generated by the floating power generation device of the invention to be lightened, energy saving and environmental protection, and the invention It is not only used for power generation in terminals, but also suitable for use in harsh environments where water is dry and dry during offshore operations.

Further, the first heat exchange process is a shell side of the gasification heater, the second heat exchange process is a tube process of the gasification heater; the third heat exchange process is a shell side of the first heat exchanger, and the fourth heat exchange The process is a pipe process of the first heat exchanger; a second heat exchanger is connected to the pipeline between the outlet of the third heat exchange process and the inlet of the second heat exchange process; and the pipe outlet of the second heat exchanger passes The second central pipe is branched to a plurality of customer terminals, and the plurality of customer terminals are connected to the chilled water return port of the lithium bromide refrigeration unit through the pipeline, and the chilled water outlet of the lithium bromide refrigeration unit is connected to the inlet of the second central pipe through the pipeline, and the second heat exchanger The tube inlet is connected to the middle of the confluence conduit connecting the plurality of user terminals; the cooling water inlet and outlet of the lithium bromide refrigeration unit is connected to the outdoor cooling tower through the pipeline to be cooled The circuit; the driving heat source inlet of the lithium bromide refrigeration unit is connected to the steam outlet of the steam turbine through a pipeline, and the driving heat source outlet of the lithium bromide refrigeration unit is connected to the condensate storage tank through the third heat exchanger.

The above process flow of the invention constitutes a refrigeration system, and the system realizes two modes of refrigeration: utilizing the characteristics of releasing a large amount of cold energy when LNG is gasified, and driving the lithium bromide solution to be vaporized by steam heat energy, and absorbing heat by vaporization. The characteristics of the refrigeration. Among them, the cooling method is one. In the circuit between the third heat exchange process and the second heat exchange process, the LNG cools the intermediate heat medium to a low temperature when the gasification is vaporized in the gasification heater, and some of the low temperature heat medium enters the first exchange. The heat exchanger is heated to a certain temperature by the low-pressure steam, and then enters the second heat exchanger to exchange heat with the chilled water (refrigerant water), and the heat medium after the heat exchange enters between the third heat exchange process and the second heat exchange process. The heat medium loop continues to circulate, and the chilled water is cooled in the second heat exchanger for use by various users. In the second cooling mode, a certain pressure of steam is extracted from the steam turbine, and a lithium bromide refrigeration unit is introduced as a driving heat source. The steam condensate from the lithium bromide refrigeration unit is reduced to a certain temperature through the third heat exchanger, and then input into the condensate storage tank. The chilled water (refrigerant water) is supplied to each user after being cooled by the lithium bromide refrigeration unit. The chilled water after use by the user is returned to the refrigeration unit and re-cooled. According to the demand of cooling capacity, one or two of the above methods can be selected for cooling, and the generated cooling amount can be allocated to multiple users. The invention can fully benefit the two kinds of waste heat resources for cooling, energy saving and environmental protection. Therefore, the invention is not only used for power generation at the dock, but also suitable for the hot and harsh environment during oceanic operation.

Further, an open deck shelf is also installed on the deck of the boat type floating body, and the exposed The sky deck shelf is used to set the wire or cable rack to output the power after the transformer chamber is transformed, which is convenient for power output.

Optionally, a plurality of mooring winches for mooring the LNG floating power generation device on the side of the dock are mounted on the deck of the ship type floating body, and the ship type floating body tightens the cable through the mooring winch on the deck to attach the hull On the dock, the stable mooring is realized, so the LNG floating power generation device of the present invention is moored on the dock and the docking is stable.

Another optional solution is that a plurality of connecting rods are further mounted on the deck of the floating body of the ship, and each connecting rod is provided with a positioning sleeve, and the positioning sleeve is used for locating the positioning pile on the side of the dock. The positioning pile first enters a certain depth below the mud line, and the ship type floating body is dragged into the space between the positioning piles, and then there are connecting rods on both sides of the hull, and the connecting rod is connected with the positioning pile to realize stable mooring.

Further, the LNG storage tank is a C-type tank, a B-type tank or a film type tank, and the ship type floating body of the present invention can be provided with LNG storage tanks of different cabin types, and has a wide application range. The LNG storage tank can also be in other forms, such as type A tanks.

Further, the steam turbine and the second generator are arranged inside or on the deck of the ship type floating body, which is convenient for space utilization and actual layout optimization, and is convenient for layout of the hull equipment.

In summary, the working principle of the present invention: LNG transports LNG on the LNG carrier by pipeline to each LNG storage tank in the ship's floating body through the LNG receiving platform on the LNG floating power generating device of the present invention. During the operation of the device, the natural gas supplied to the gas turbine is from two channels, one is BOG from the natural evaporation of the ship type floating body, and the BOG is input into the BOG compressor through the pipe. The BOG compressor is driven by the electric motor, after compression The BOG enters the cooler to cool down, Then enter the combustion chamber of each gas turbine to burn work. The other channel is that the LNG in each LNG storage tank is input into the gasification heater through the deep submersible pump, and the natural gas produced after the gasification is merged with the BOG compressed and cooled natural gas, and then input into the combustion chamber of each gas turbine for combustion work. The intake end of each gas turbine is coaxially connected to the first generator, and the exhaust gas discharge end of each gas turbine is connected to a waste heat boiler, and each waste heat boiler is heated by the heat of the exhaust gas for two steam circuits, one for high/medium pressure The steam circuit and the other are low pressure steam circuits. The high/intermediate pressure steam circuit generated from a plurality of waste heat boilers is input into a steam turbine for work, and the steam turbine is coaxially connected to the second generator, and finally the electric power generated by the second generator is supplied to the transformer chamber. The steam after work passes through the condensing device and becomes liquid water and is stored in the condensate storage tank. The low-pressure steam generated from the low-pressure steam circuit of the plurality of waste heat boilers is input into the fourth heat exchange process of the first heat exchanger through the pipeline, and is exchanged with the heat medium in the first heat exchange process, and the heat medium is in the third A closed loop is performed between the heat exchange process and the second heat exchange process to transfer heat in the low pressure steam circuit to the gasification heater for gasification and heating of the LNG. The low pressure steam passing through the first heat exchanger becomes liquid water and is input to the condensate storage tank for storage. The water in the condensate storage tank is pumped into the high/medium pressure steam circuit and the low pressure steam circuit in each waste heat boiler by a submersible pump for heating and evaporation. The power generated by the first generator and the second generator is connected to the transformer chamber through a cable, and the transformed electric energy is outputted through the weather deck rack. Part of the sewage will be generated in the whole steam circuit. The sewage is discharged from the waste heat boiler into the boiler sewage buffer tank, part of the steam is returned to the deaerator, and the sewage is discharged from the boiler sewage buffer tank to ensure the clean and recycling of the water body. use. The invention removes oxygen in the water by heating the water supply by the deaerator steam, and avoids the oxygen corrosion apparatus in the apparatus at a high temperature. Since then, the entire process of gas-steam combined cycle power generation has been completed.

Another alternative: the number of gas turbines and waste heat boilers is four, and there are two steam turbines on the deck of the ship type floating body. Each waste heat boiler is also equipped with a high/medium pressure steam circuit, two The steam outlets of the high/intermediate steam circuit are collected in the steam inlet of a steam turbine through pipes, and the steam outlets of the other two high/intermediate steam circuits are collected into the steam inlet of another steam turbine through the pipeline. In the mouth, the steam outlets of the two steam turbines are connected to the condensate storage tank through the condensing device, and the second generator is connected to the output shaft of each steam turbine, and the power output ends of the second generators are also connected by cables. To the transformer room. The invention can also adopt the four-to-two mode, which further increases the scale of LNG power generation.

The beneficial effects of a multi-function LNG floating power generation device using gas-steam combined cycle of the present invention are:

1. The ship type floating body of the invention adopts the form of unpowered barge, which has the advantages of simple structure, low manufacturing cost, large internal space, and convenient arrangement of equipment pipes;

2. The invention has high integration degree, small occupied area, and can be towed to the dock of the designated place as needed, which is flexible and convenient;

3. The construction and commissioning work of all the main bodies of the invention can be completed at the shipyard, and then towed to the designated place. The construction and commissioning work does not affect the surrounding living environment;

4. Set the gasification heater and the first heat exchanger to transfer heat through the intermediate heat medium, which has the advantages of small volume, high efficiency, stable production, and utilization of waste heat boiler The generated heat provides gasification heat energy to the LNG through the closed cycle heat medium;

5. The invention can be applied to a multi-function LNG floating power generation device using a gas-steam combined cycle with a ship-type floating body for rivers and seas or deep sea environment conditions, and the generated electric power can be connected through a cable. Access to the grid for powering cities, industrial areas and large platforms or offshore plants operating in the deep sea;

6. Due to the LNG power generation directly on the dock, the natural gas pipeline network can be omitted and the cost is low; the main electricity economic zone on the eastern coast of China has vast marine water resources, and the LNG carrier can conveniently shuttle in these waters. Stopping on the side of the multi-function LNG floating power generation device using the gas-steam combined cycle of the present invention, and transporting the LNG to the LNG floating power generation device of the present invention to generate electricity, so that the development of the floating power generation device using the water resources thereof has a good market expectation;

7. The gas-steam combined cycle generator set used in the invention has high efficiency and stable operation, and the heat energy utilization rate is above 60%, and the large supercritical/ultra-supercritical thermal power generating unit is between 40-50%;

8. The LNG energy used is clean energy, the emissions are basically water and carbon dioxide, almost no nitrogen oxides and sulfides, and no dust emission, which has far-reaching significance for environmental protection;

9. The gas-steam combined cycle generator set adopts a rapid start-stop and is extremely suitable for power peak shaving;

10. The present invention can fully utilize various resources on a floating power generation device, purify and dilute into a plurality of water resources for different needs, and can utilize the floating hair of the present invention. The electric power generated by the electric device is lightened, energy-saving and environmentally friendly, and the invention is not only used for power generation at the dock, but also suitable for the environment where water shortage and dryness are severe in oceanic operation;

11. The invention can fully benefit the two kinds of waste heat resources for cooling, energy saving and environmental protection. Therefore, the invention is not only used for power generation at the dock, but also suitable for the hot and harsh environment during oceanic operation.

DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 is a process flow diagram of a multifunctional LNG floating power generation apparatus using a gas-steam combined cycle of the present invention;

2 is a partial process flow diagram of a one-to-one mode of a multi-function LNG floating power generation device using a gas-steam combined cycle according to the present invention;

3 is a connection diagram of a gasification heater and a first heat exchanger of a multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to the present invention;

4 is a partial enlarged view of a waste heat boiler of a multi-function LNG floating power generation apparatus using a gas-steam combined cycle of the present invention;

Figure 5 is a layout view of a mooring winch of a multi-function LNG floating power generation apparatus using a gas-steam combined cycle on the deck of the present invention;

6 is a connection structural view of a connecting rod and a positioning pile of a multifunctional LNG floating power generating apparatus using a gas-steam combined cycle according to the present invention;

7 is a process flow diagram of a seawater desalination system of a multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to the present invention;

Figure 8 is a process flow diagram of a refrigeration system of a multi-function LNG floating power generation apparatus employing a gas-steam combined cycle of the present invention.

Among them: 1. ship type floating body, 101. transformer room, 102. condensate storage tank, 103. LNG storage tank; 2. gasification heater, 201. first heat exchange process, 202. second heat exchange process; First heat exchanger, 301. third heat exchange process, 302. fourth heat exchange process; 4. first central pipe; 5. gas turbine; 6. waste heat boiler; 7. deep submersible pump; 9. Low pressure steam circuit; 10. Condensate transfer pump; 11. Forced circulation pump; 12. LNG receiving platform; 13. BOG compressor; 14. Cooler; 15. Steam turbine; 16. High/medium pressure steam circuit ; 17. Condensation equipment; 18. Second generator; 19. Open deck shelf; 20. Mooring winch; 21. Positioning pile; 22. Connecting rod, 2201. Positioning sleeve; 23. Electric motor; 25. Boiler sewage buffer tank; 26. Water supply pipe; 150. Sea water tank, 151. Ultrafiltration module, 152. Ultrafiltration water tank, 153. Seawater reverse osmosis module, 154. First stage reverse osmosis water tank, 155. Secondary reverse osmosis module, 156. desalinated tank, 157. deionized module, 158. deionized water tank, 159. drinking water aftertreatment module; 161. second heat exchanger, 162. second central pipeline, 163. lithium bromide refrigeration unit 164. Households External cooling tower, 165. Third heat exchanger. The solid line in FIGS. 1 to 3 is a liquid fluid line, the broken line is a gaseous fluid line, and the dotted line is a cable line.

detailed description

The invention will now be described in further detail with reference to the drawings. The drawings are simplified schematic diagrams, and only the basic structure of the present invention is illustrated in a schematic manner, and thus only the configurations related to the present invention are shown.

Embodiment 1:

A first embodiment of a multi-function LNG floating power generation apparatus using a gas-steam combined cycle according to the present invention as shown in FIG. 1 to FIG. 8 includes a ship type floating body 1 in which a transformer chamber 101 is provided and a condenser is provided. a water storage tank 102 and a plurality of LNG storage tanks 103; a deck of the ship type floating body 1 is provided with a gasification heater 2, a first heat exchanger 3, a first central duct 4, a plurality of gas turbines 5, and a plurality of waste heat boilers 6, The gas turbine 5 and the waste heat boiler 6 are disposed one by one, and the gasification heater 2 is provided with a first heat exchange process 201 and a second heat exchange process 202 for performing heat exchange with each other, and the first heat exchanger 3 is provided with mutual mutual a third heat exchange process 301 and a fourth heat exchange process 302 of heat exchange;

Each of the LNG storage tanks 103 is provided with a deep submersible pump 7 , and the deep submersible pumps 7 are all collected through the pipeline to the input port of the first heat exchange process 201 , and the output port of the first heat exchange process 201 communicates with the first central duct 4 . The inlet of the first central pipe 4 is branched into the intake ports of the respective gas turbines 5, and the first generator 8 is coaxially connected to each of the gas turbines 5, and the power output ends of the first generators 8 are all connected to the transformer room. 101;

The exhaust gas discharge ports of the respective gas turbines 5 are respectively connected to the waste heat boiler 6 in one-to-one correspondence, and each of the waste heat boilers 6 is provided with a low-pressure steam circuit 9; condensed water storage The condensate transfer pump 10 is disposed in the tank 102, and the pump outlet of the condensate transfer pump 10 is branched to the inlet end of each low-pressure steam circuit 9 through the pipeline, and the outlet end of the low-pressure steam circuit 9 is collected to the fourth heat exchange through the pipeline. In the inlet of the process 302, the outlet of the fourth heat exchange process 302 is connected to the condensate storage tank 102; the third heat exchange process 301 and the second heat exchange process 202 constitute a circulation loop, and the circulation loop is provided with a forced circulation pump 11, And there is circulation of heat medium.

The ship type floating body 1 of the present embodiment adopts the form of an unpowered barge, which has the advantages of simple structure, low manufacturing cost, large internal space, and convenient arrangement of equipment pipes. Wherein, the internal space is arranged with a transformer chamber 101, a condensate storage tank 102 and a plurality of LNG storage tanks 103; a deck arrangement gasification heater 2, a first heat exchanger 3, a first central duct 4, a plurality of gas turbines 5 and several The waste heat boiler 6; therefore, the embodiment has high integration degree, small occupied area, and can be towed to the dockside of the designated place as needed, which is flexible and convenient. In addition, the construction and commissioning work of all the main bodies in this embodiment can be completed at the shipyard, and then towed to the designated place. The construction and debugging work does not affect the surrounding living environment.

A plurality of LNG storage tanks 103 may be disposed in the boat type floating body 1, and a deep submersible pump 7 is disposed in each of the LNG storage tanks 103. During the operation of the apparatus, the LNG in the LNG storage tank 103 is input to the gasification heater 2 through the deep submersible pump 7, and the natural gas generated after the gasification is input to the combustion chamber in each of the gas turbines 5 for combustion work. The intake end of each gas turbine 5 is coaxially connected to the first generator 8, and the exhaust gas discharge end of each gas turbine 5 is connected to the corresponding waste heat boiler 6, and the waste heat boiler 6 is heated by the low-pressure steam circuit 9 using the heat of the exhaust gas. Low in low pressure steam circuit 9 The pressurized steam is input into the fourth heat exchange process 302 in the first heat exchanger 3 through the pipeline, and the low pressure steam in the fourth heat exchange process 302 is heat exchanged with the heat medium in the third heat exchange process 301, and the heat medium is vaporized. The heater 2 and the first heat exchanger 3 are in a closed loop to transfer heat in the low pressure steam circuit 9 to the gasification heater 2 for gasification and heating of the LNG. Wherein, the low-pressure steam cannot be directly introduced into the gasification heater 2 for heating and vaporizing the LNG, and the low-pressure steam encounters the low-temperature LNG, which may freeze and cause the equipment to be inoperable, so the gasification heater 2 and the first heat exchanger 3 need to be disposed through the middle. The heat medium transfers heat, which has the advantages of small volume, high efficiency, stable production, and uses the heat generated by the waste heat boiler 6 to provide gasification heat energy to the LNG through the closed cycle heat medium. The low pressure steam passing through the fourth heat exchange process 302 becomes liquid water and is input to the condensate storage tank 102 for storage. The water in the condensate storage tank 102 is pumped into each of the waste heat boilers 6 by the condensate transfer pump 10 to be heated, thereby forming a low pressure steam circuit 9. Finally, the electric power generated by each of the first generators 8 is connected to the transformer chamber 101 through a cable, and the converted electric energy can be output to the outside.

Preferably, the first heat exchange process 201 can be the shell side of the gasification heater 2, and the second heat exchange process 202 can be the tube process of the gasification heater 2; the heat energy utilization rate is high, and the internal cleaning is convenient.

Preferably, the third heat exchange process 301 can be the shell side of the first heat exchanger 3, and the fourth heat exchange process 302 can be the tube process of the first heat exchanger 3, and the heat energy utilization rate is high.

The present embodiment can be applied to a multi-function LNG floating power generation device using a gas-steam combined cycle with a ship-type floating body 1 for rivers and seas or deep sea environment conditions, and the generated electric power can be connected through a cable. Entering electricity The network supplies electricity to cities, industrial areas and large platforms or offshore plants operating in the deep sea. The construction of existing land-based natural gas power plants is subject to the laying of natural gas pipeline networks, and the cost is enormous. Since the LNG power generation is directly carried out on the dock, the natural gas pipeline network can be omitted and the cost is low. The main electricity-using economic zone in the eastern coastal areas of China has vast marine water resources, and the LNG carrier can conveniently shuttle in these waters and park on the side of the multi-function LNG floating power generation device using the gas-steam combined cycle of this embodiment. And transporting LNG to the LNG floating power generation device of the present embodiment to generate electricity, and therefore, the use of its water resources to develop a floating power generation device has a good market prospect.

The gas-steam combined cycle generator set used in this embodiment has high efficiency and stable operation, and its thermal energy utilization rate is above 60%, while the large supercritical/ultra-supercritical thermal power generating set is between 40-50%; the LNG used Energy is clean energy, emissions are basically water and carbon dioxide, almost no nitrogen oxides and sulfides, no dust emission, far-reaching significance for environmental protection; the use of gas-steam combined cycle generator sets, rapid start and stop, extremely suitable Peaking in power.

Specifically, the deck of the ship type floating body 1 is further provided with an LNG receiving platform 12 for conveying the LNG on the LNG carrier outside the apparatus to the respective LNG storage tanks 103 by means of a hose. The ship type floating body 1 can be docked on the side of the dock. The LNG carrier is docked on the side of the ship type floating body, that is, the ship type floating body 1 is located between the LNG carrier and the dock, making full use of the vast marine water resources, not occupying land resources, and utilizing its waters. Resource development of floating power plants has good prospects.

Specifically, the BOG compressor 13 and the cooler 14 are further disposed on the deck of the ship type floating body 1. The top air chambers of the respective LNG storage tanks 103 are connected to the input port of the BOG compressor 13 through the pipeline, and the output port of the BOG compressor 13 It is communicated through the cooler 14 to the inlet of the first central duct 4. The naturally-evaporated BOG is generated every day in the LNG storage tank 103, and the BOG in the ship-type floating body 1 of the present embodiment is input into the BOG compressor 13 through a pipe, and the BOG compressor 13 can be driven by the electric motor 23, and the compressed BOG enters. The aftercooler 14 is cooled and then collected into a first central duct 4 for collecting and transporting the BOG compressed and cooled natural gas and the natural gas produced by the gasification, and then the first central duct 4 is branched to In the intake ports of the respective gas turbines 5, each of the gas turbines 5 performs combustion work. The gas turbine 5 has pressure and temperature requirements for the burned natural gas, and the compressed BOG will heat up after reaching the pressure requirement, so the cooler 14 is required to cool down to reach the combustion temperature requirement. Wherein, the condensate of the cooler 14 is water, and the water can be directly cooled by a pump to extract fresh water or seawater outside the hull. This embodiment also fully utilizes BOG for combustion power generation, thereby improving energy utilization.

Further, the ship type floating body 1 is further provided with a plurality of steam turbines 15, and each of the waste heat boilers 6 is also provided with a high/intermediate pressure steam circuit 16, and the steam outlet ends of the high/intermediate pressure steam circuits 16 are all passed through the pipeline. Connected to the steam inlet of each steam turbine 15 in a many-to-one or one-to-one manner, the steam outlet end of the steam turbine 15 is communicated to the condensate storage tank 102 through the condensing device 17, and the output shaft of the steam turbine 15 is connected to the first The power output ends of the second generator 18 and the second generator 18 are also cable-connected to the transformer chamber 101; the transformer in the transformer chamber 101 is a dry transformer, oil-immersed transformer Or gas insulated transformer. It is of course also possible to arrange the transformer on the deck as required, and the electric power generated by the first generator 8 and the second generator 18 is transmitted through the cable to the transformer chamber 101 for transformation. This embodiment can be set differently according to the requirements of the power generation scale, but the basic principles are the same. Each gas turbine 5 is coaxially connected to a first generator 8 at the inlet end, and a waste heat boiler 6 is connected to the waste discharge end. The high/intermediate steam generated by the multiple waste heat boilers 6 is input to a steam turbine. 15. The steam turbine 15 is connected to a second generator 18. The embodiment has a wide application range and is suitable for transformation of different power generation scales, and the maximum power generation capacity is up to 800 megawatts. The waste heat boiler 6 of the present embodiment may be a three-pressure waste heat boiler, which may also generate high/intermediate pressure steam by utilizing waste heat of the exhaust gas in the gas turbine 5 to drive the steam turbine 15 to generate waste heat, and the high/medium pressure steam recovery of the embodiment. Strong residual heat capacity further improves energy efficiency.

The number of the gas turbine 5 and the waste heat boiler 6 is the same, and the number of the steam turbines 15 is several; specifically, one gas turbine 5 + one waste heat boiler 6 + one steam turbine 15 is a one-to-one configuration Two gas turbines 5 + two waste heat boilers 6 + one steam turbine 15 , that is, two tow one configuration; three gas turbines 5 + three waste heat boilers 6 + two steam turbines 15, which is a three-to-two configuration This embodiment can adopt other different configurations according to different power generation scales and the power matching relationship between the gas turbine 5, the waste heat boiler 6 and the steam turbine 15, such as five to three, four to four or three tow.

Specifically, the multifunctional LNG floating power generation device further includes a plurality of deaerators 24, the deaerator 24 and the waste heat boiler 6 are in one-to-one correspondence, and the pump outlet of the condensate transfer pump 10 is The pipe is diverted to each of the deaerators 24, and each deaerator 24 is branched through a pipe to the inlet of the low pressure steam circuit 9 and the high/intermediate pressure steam circuit 16 in the corresponding waste heat boiler 6, the deaerator 24 The steam inlet is in communication with the outlet line of the low pressure steam circuit 9. In this embodiment, the water is removed by steam heating to remove oxygen in the water, and the various devices in the apparatus are protected from oxygen at high temperatures.

Preferably, the multi-function LNG floating power generation device in the one-to-one mode shown in FIG. 2 further includes a deaerator 24, and the deaerator 24 is correspondingly provided with a waste heat boiler 6, and the pump outlet of the condensate transfer pump 10 passes. The pipe is diverted to the deaerator 24, and the deaerator 24 is branched to the inlet of the low pressure steam circuit 9 and the high/intermediate steam circuit 16 in the waste heat boiler 6, and the steam inlet and low pressure steam circuit of the deaerator 24 are 9 The outlet line is connected.

Specifically, a water supply pipe 26 is connected to the pipeline between the pump outlet of the condensate pump 10 and the deaerator 24; the sewage outlet of the waste heat boiler 6 is connected to the boiler sewage buffer tank 25 through the pipeline, and the boiler sewage buffer tank 25 The gas phase outlet is connected to each of the deaerators 24 through a pipe, and the sewage outlet of the boiler sewage buffer tank 25 is connected to the outside of the multifunctional LNG floating power generation device. There is a loss of water throughout the steam cycle, and the waste heat boiler 6 will continuously replenish the lost water from the outside. Part of the sewage is generated in the entire steam circuit, and the sewage is discharged from the waste heat boiler 6 into the boiler sewage buffer tank 25, part of the steam is returned to the deaerator 24, and the sewage is discharged from the boiler sewage buffer tank 25, thereby ensuring the water body. Clean and recycle.

Specifically, as shown in the seawater desalination system shown in FIG. 7, the multifunctional LNG floating power generation device further includes a seawater desalination system, and the seawater desalination system includes a seawater tank 150, the sea. An inlet pipe is connected to the water tank 150. The seawater tank 150 sequentially communicates with the ultrafiltration module 151, the ultrafiltration production tank 152, the seawater reverse osmosis module 153, the first-stage reverse osmosis water tank 154, the secondary reverse osmosis module 155, and desalting through the first pipeline. The water tank 156, the deionization module 157 and the deionized water tank 158, the deionized water tank 158 is connected to the water inlet of the water supply pipe 26 through the outlet pipe; the water outlet of the first reverse osmosis water tank 154 is connected to the drinking water post-processing module through the second pipeline. 159. The water outlet of the drinking water aftertreatment module 159 is used for external drinking water; the first reverse osmosis water tank 154 is connected to the fresh water daily system through the third pipeline.

In the present embodiment, three parts of water, that is, external drinking water, the daily fresh water of the floating power generation device of the present embodiment, and the waste heat boiler 6 of the gas-steam combined cycle generator set are hydrated (deionized water) by the seawater desalination system. The seawater from the seawater tank 150 passes through the ultrafiltration module 151 to generate clean seawater, reaches the water inlet requirement of the seawater reverse osmosis module 153, and is sent to the seawater reverse osmosis module 153 through the ultrafiltration production tank 152, and the primary fresh water is stored at the first stage. In the reverse osmosis water tank 154, a part of the fresh water is available for the fresh water daily system of the floating power generation device of the present embodiment, and most of the fresh water is adjusted to the drinking water after the drinking water post-treatment module 159 adjusts the pH, chlorination and minerals to reach the drinking water standard. The fresh water from the first reverse osmosis water tank 154 is sent to the desalinated water tank 156 through the secondary reverse osmosis module 155, and is deionized water through the deionization module 157, and stored in the deionized water tank 158 for waste heat. Boiler 6 replenishes water. In this embodiment, the resources on the floating power generation device can be fully utilized, purified and diluted into a plurality of water resources for different needs, and the power generated by the floating power generation device of the embodiment can be used for desalination, energy saving and environmental protection. This embodiment is not only It is only used for power generation at the dock, and it can also be used in the harsh environment where water and dryness are used in ocean-going operations.

Further, as shown in the refrigeration system of FIG. 8, the first heat exchange process 201 is the shell side of the gasification heater 2, the second heat exchange process 202 is the tube process of the gasification heater 2, and the third heat exchange process 301 For the shell side of the first heat exchanger 3, the fourth heat exchange process 302 is the tube path of the first heat exchanger 3; the line between the outlet of the third heat exchange process 301 and the inlet of the second heat exchange process 202 The second heat exchanger 161 is connected to the middle; the tube outlet of the second heat exchanger 161 is branched to the plurality of customer terminals through the second central conduit 162, and the plurality of customer terminals are connected to the chilled water return port of the lithium bromide refrigeration unit 163 through the pipeline. The chilled water outlet of the lithium bromide refrigeration unit 163 is connected to the inlet of the second central pipe 162 through a pipe, and the pipe inlet of the second heat exchanger 161 communicates with the middle of the manifold pipe of the plurality of customer terminals; the inlet and outlet of the cooling water of the lithium bromide refrigeration unit 163 passes through The pipeline communicates with the outdoor cooling tower 164 to form a cooling circuit; the driving heat source inlet of the lithium bromide refrigeration unit 163 is connected to the steam outlet of the steam turbine 15 through a pipeline, and the driving heat source outlet of the lithium bromide refrigeration unit 163 is connected to the condensate storage through the third heat exchanger 165. Storage 102.

The above process flow of the embodiment constitutes a refrigeration system, and the system realizes two modes of refrigeration: utilizing the characteristics of releasing a large amount of cold energy when LNG is gasified, and driving the lithium bromide solution to be vaporized by steam heat energy, and absorbing it by vaporization. The characteristics of heat are cooled. In the refrigeration mode 1, in the circuit between the third heat exchange process 301 and the second heat exchange process 202, the LNG cools the intermediate heat medium to a low temperature when the gasification heater 2 is vaporized, and some of the low temperature heat medium enters. The first heat exchanger 3 is heated by a low pressure steam to a certain temperature, and then enters the second heat exchanger 161 and The chilled water (refrigerant water) exchanges heat, and the heat medium after the heat exchange enters the heat medium circuit between the third heat exchange process 301 and the second heat exchange process 202, and the chilled water is circulated in the second heat exchanger 161. It is provided to each user after cooling. In the second cooling mode, a certain pressure of steam is extracted from the steam turbine 15, and a lithium bromide refrigeration unit 163 is introduced as a driving heat source. The steam condensate from the lithium bromide refrigeration unit 163 is lowered to a certain temperature through the third heat exchanger 165, and then input into the condensation. The water storage tank 102, chilled water (refrigerant water) is supplied to each user after being cooled by the lithium bromide refrigeration unit 163. The chilled water after use by the user is returned to the refrigeration unit and re-cooled. According to the demand of cooling capacity, one or two of the above methods can be selected for cooling, and the generated cooling amount can be allocated to multiple users. In this embodiment, the two waste heat resources can be fully utilized for cooling, energy saving and environmental protection. Therefore, the embodiment is not only used for power generation at the dock, but also suitable for a hot environment in oceanic operation.

Further, the deck of the ship type floating body 1 is further provided with an open deck rail frame 19 for setting a wire or a cable rack to output electric energy after the transformer chamber 101 is transformed, so as to facilitate electric power output.

Optionally, a plurality of mooring winches 20 for mooring the LNG floating power generation device on the side of the dock are mounted on the deck of the ship type floating body 1, and the ship type floating body 1 tightens the cable through the mooring winch 20 on the deck thereof. The hull is attached to the dock to achieve stable mooring. Therefore, the LNG floating power generation device of the present embodiment is moored on the dock and the docking is stable.

Another optional solution is that a plurality of connecting rods 22 are further mounted on the deck of the boat-shaped floating body 1, and each connecting rod 22 is provided with a positioning sleeve 2201, and the positioning sleeve 2201 It is used to nest the positioning pile 21 on the edge of the dock. The positioning pile 21 firstly enters a certain depth below the mud line, and the ship type floating body 1 is dragged into the space between the positioning piles 21, and then the connecting rod 22 is connected on both sides of the hull, and the connecting rod 22 is connected with the positioning pile 21 to realize stable mooring.

Further, the LNG storage tank 103 is a C-type tank, a B-type tank or a film-type tank. The ship-type floating body 1 of the present embodiment can be provided with LNG storage tanks 103 of different cabin types, and has a wide application range. The LNG storage tank 103 can also take other forms, such as an A-type can.

Further, the steam turbine 15 and the second generator 18 are disposed on the interior or the deck of the ship type floating body 1 to facilitate space utilization and actual layout optimization, and facilitate layout of the hull equipment.

In summary, the working principle of the embodiment: LNG transports the LNG on the LNG carrier through the pipeline to each LNG storage compartment 103 in the ship buoy 1 through the LNG receiving platform 12 on the LNG floating power generation device of the present embodiment. . During the operation of the device, the natural gas supplied to the gas turbine 5 is from two passages, one is BOG from the natural evaporation of the ship type floating body 1, and the BOG is input into the BOG compressor 13 through the pipe, and the BOG compressor 13 is driven by an electric motor. Driven by 23, the compressed BOG enters the cooler 14 for cooling, and then enters the combustion chamber of each gas turbine 5 to perform work. The other passage is that the LNG in each LNG storage tank 103 is input to the gasification heater 2 through the deep submersible pump 7, and the natural gas produced after the gasification is merged with the BOG compressed and cooled natural gas, and then input to the combustion chamber of each gas turbine 5. Burning work. The intake end of each gas turbine 5 is coaxially connected to the first generator 8, and the exhaust gas discharge end of each gas turbine 5 is connected to a waste heat boiler 6, and each waste heat boiler is heated by the heat of the exhaust gas for two steam circuits, one for High/medium The steam circuit 16 is pressurized and the other is a low pressure steam circuit 9. The high/intermediate pressure steam circuit 16 generated from the plurality of waste heat boilers 6 is input to a steam turbine 15 for work, the steam turbine 15 is coaxially connected to the second generator 18, and finally the electric power generated by the second generator 18 is supplied to the transformer. Room 101. The steam after the work passes through the condensing device 17 and becomes liquid water and is stored in the condensate storage tank 102. The low pressure steam is generated from the low pressure steam circuit 9 of the plurality of waste heat boilers 6 and is input into the fourth heat exchange process 302 of the first heat exchanger 3 through the pipeline, and exchanges heat with the heat medium in the first heat exchange process 201, The heat medium performs a closed loop between the third heat exchange process 301 and the second heat exchange process 202 to transfer heat in the low pressure steam circuit 9 to the gasification heater 2 for gasification and heating of the LNG. . The low pressure steam passing through the first heat exchanger 3 becomes liquid water and is input to the condensate storage tank 102 for storage. The water in the condensate storage tank 102 is pumped by the deep submersible pump 7 into the high/medium pressure steam circuit 16 and the low pressure steam circuit 9 in each waste heat boiler 6 for heating and evaporation. The electric power generated by the first generator 8 and the second generator 18 is connected to the transformer chamber 101 through a cable, and the transformed electric energy is outputted through the open deck bay 19. Part of the sewage is generated in the entire steam circuit, and the sewage is discharged from the waste heat boiler 6 into the boiler sewage buffer tank 25, part of the steam is returned to the deaerator 24, and the sewage is discharged from the boiler sewage buffer tank 25, thereby ensuring the water body. Clean and recycle. In this embodiment, the oxygen in the water is removed by the method of steam heating the deaerator 24 to avoid the various devices in the oxygen etching apparatus at high temperatures. Since then, the entire process of gas-steam combined cycle power generation has been completed.

Embodiment 2:

The second embodiment is a preferred solution, and the second embodiment differs from the first embodiment in that: The number of the gas turbine 5 and the waste heat boiler 6 is four, and two steam turbines 15 are disposed on the deck of the ship type floating body 1, and each of the waste heat boilers 6 is also provided with a high/intermediate pressure steam circuit 16, two The steam outlets of the high/intermediate steam circuit 16 are collected in a steam inlet of a steam turbine 15 through a pipe, and the steam outlets of the other two high/intermediate steam circuits 16 are collected by a pipe to another steam turbine. In the steam inlet of the 15th, the steam outlets of the two steam turbines 15 are all connected to the condensate storage tank 102 through the condensing device 17, and the second generator 18 is connected to the output shaft of each steam turbine 15 for each second power generation. The power output of the machine 18 is also cabled to the transformer chamber 101; other structures are the same as in the first embodiment. This embodiment adopts a four-to-two mode, which further increases the scale of LNG power generation.

It is understood that the specific embodiments described above are merely illustrative of the invention and are not intended to limit the invention. Obvious changes or variations that come within the spirit of the invention are still within the scope of the invention.

Claims

A multifunctional LNG floating power generation device using a gas-steam combined cycle, comprising: a ship type floating body (1), wherein the ship type floating body (1) is provided with a transformer chamber (101) and a condensate storage tank (102) And a plurality of LNG storage tanks (103); the deck of the ship type floating body (1) is equipped with a gasification heater (2), a first heat exchanger (3), a first central pipe (4), and a plurality of a gas turbine (5) and a plurality of waste heat boilers (6), the gas turbine (5) and the waste heat boiler (6) are disposed in one-to-one correspondence, and the gasification heater (2) is provided with a first mutual heat exchange a heat exchange process (201) and a second heat exchange process (202), wherein the first heat exchanger (3) is provided with a third heat exchange process (301) and a fourth heat exchange process (302) for performing heat exchange with each other. );

Each of the LNG storage tanks (103) is provided with a deep submersible pump (7), and the deep submersible pumps (7) are all collected through an pipeline to an input port of the first heat exchange process (201), the first heat exchange The output port of the flow (201) is connected to the inlet of the first central pipe (4), and the outlet of the first central pipe (4) is branched into the intake ports of the respective gas turbines (5), and each gas turbine (5) is coaxial Connected to the first generator (8), the power output end of each first generator (8) is cable connected to the transformer chamber (101);

The exhaust gas discharge ports of the respective gas turbines (5) are respectively connected to the waste heat boiler (6) in one-to-one correspondence, and each of the waste heat boilers (6) is provided with a low-pressure steam circuit (9); the condensate storage tank (102) There is a condensate transfer pump (10), and the pump outlet of the condensate transfer pump (10) is branched through a pipe to the inlet end of each low-pressure steam circuit (9), and the low-pressure steam circuit (9) The steam ends are all collected into the inlet of the fourth heat exchange process (302) through the pipeline, and the outlet of the fourth heat exchange process (302) Connected to the condensate storage tank (102); the third heat exchange process (301) and the second heat exchange process (202) constitute a circulation loop, the circulation loop is provided with a forced circulation pump (11), and the circulation There is hot media.
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 1, wherein a BOG compressor (13) and a cooler are further disposed on the deck of the ship type floating body (1). (14), the top air chamber of each LNG storage tank (103) is connected to the input port of the BOG compressor (13) through a pipe, and the output port of the BOG compressor (13) is connected to the first through the cooler (14) An inlet for a central pipe (4).
A multi-function LNG floating power generation apparatus using a gas-steam combined cycle according to claim 1 or 2, characterized in that said ship type floating body (1) is further provided with a plurality of steam turbines (15), each of which is waste heat The boiler (6) is also provided with a high/intermediate pressure steam circuit (16), and the steam outlets of the high/medium pressure steam circuits (16) are connected to each other through a pipe in a one-to-one or one-to-one manner. In the steam inlet of the steam turbine (15), the steam outlet of the steam turbine (15) is connected to the condensate storage tank (102) through a condensing device (17), and the output shaft of the steam turbine (15) is connected a second generator (18), wherein the power output of the second generator (18) is also cabled to the transformer chamber (101); the transformer in the transformer chamber (101) is a dry transformer, oil immersed Transformer or gas insulated transformer.
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 3, wherein said multifunctional LNG floating power generation apparatus further comprises a plurality of deaerators (24), said Deaerator (24) and waste heat The boiler (6) corresponds one-to-one, and the pump outlet of the condensate transfer pump (10) is diverted through the pipeline to each deaerator (24), and each deaerator (24) is diverted through the pipeline to the corresponding waste heat. The low pressure steam circuit (9) in the boiler (6) and the inlet of the high/intermediate pressure steam circuit (16), the steam inlet of the deaerator (24) is in communication with the outlet line of the low pressure steam circuit (9).
A multi-function LNG floating power generation apparatus using a gas-steam combined cycle according to claim 4, characterized in that: between the pump outlet of the condensate transfer pump (10) and the deaerator (24) A water supply pipe (26) is further connected to the pipeline; the sewage outlet of the waste heat boiler (6) is connected to a boiler sewage buffer tank (25) through a pipeline, and the gas phase outlet of the boiler sewage buffer tank (25) is connected to each through a pipeline The deaerator (24), the sewage outlet of the boiler sewage buffer tank (25) is connected to the outside of the multifunctional LNG floating power generation device.
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 5, wherein said multifunctional LNG floating power generation apparatus further comprises a seawater desalination system, said seawater desalination system comprising seawater a tank (150), the seawater tank (150) is connected with an inlet pipe, and the seawater tank (150) is sequentially connected to the ultrafiltration module (151), the ultrafiltration water tank (152), and seawater reverse osmosis through the first pipeline. Module (153), primary reverse osmosis water tank (154), secondary reverse osmosis module (155), desalinated water tank (156), deionization module (157) and deionized water tank (158), said deionized water tank (158) Connecting to the water inlet of the water supply pipe (26) through an outlet pipe; the water outlet of the first-stage reverse osmosis water tank (154) is connected to the drinking water after-treatment module (159) through the second pipeline, after the drinking water Processing mode The water outlet of the block (159) is used for external drinking water; the first-stage reverse osmosis water tank (154) is connected to the fresh water daily system through the third pipeline.
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 5, wherein said first heat exchange process (201) is a shell side of a gasification heater (2). The second heat exchange process (202) is a pipe path of the gasification heater (2); the third heat exchange process (301) is a shell process of the first heat exchanger (3), and the fourth heat exchange process (302) is a tube path of the first heat exchanger (3); a second exchange is made in the pipeline between the outlet of the third heat exchange process (301) and the inlet of the second heat exchange process (202) The heat exchanger (161); the tube outlet of the second heat exchanger (161) is branched to the plurality of customer terminals through the second central conduit (162), and the plurality of customer terminals are connected to the freezing of the lithium bromide refrigeration unit (163) through the pipeline a water return port, the chilled water outlet of the lithium bromide refrigeration unit (163) is connected to the inlet of the second central pipe (162) through a pipe, and the pipe inlet of the second heat exchanger (161) communicates with the confluence of the plurality of customer terminals a middle portion of the pipeline; the cooling water inlet and outlet of the lithium bromide refrigeration unit (163) is connected to the outdoor cooling tower (164) through a pipeline to form a cooling circuit; the lithium bromide refrigerator The drive heat source inlet of (163) is connected to the steam outlet of the steam turbine (15) through a pipe, and the drive heat source outlet of the lithium bromide refrigeration unit (163) is connected to the condensate storage tank (102) through the third heat exchanger (165) .
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 4, characterized in that the deck of the ship type floating body (1) is further provided with an open deck shelf (19). The open deck shelf (19) is used to set up a wire or cable rack to output electrical energy after the transformer chamber (101) is transformed.
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 4, wherein said LNG storage tank (103) is a C-type tank, a B-type tank or a film type tank.
A multifunctional LNG floating power generation apparatus using a gas-steam combined cycle according to claim 3, wherein said steam turbine (15) and said second generator (18) are provided in a ship type floating body (1) Inside or on the deck.