CN110185930B - LNG receiving station gasification device and power plant circulating water combined utilization system - Google Patents
LNG receiving station gasification device and power plant circulating water combined utilization system Download PDFInfo
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- CN110185930B CN110185930B CN201910549555.4A CN201910549555A CN110185930B CN 110185930 B CN110185930 B CN 110185930B CN 201910549555 A CN201910549555 A CN 201910549555A CN 110185930 B CN110185930 B CN 110185930B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000002309 gasification Methods 0.000 title claims abstract description 14
- 239000013535 sea water Substances 0.000 claims abstract description 112
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000000498 cooling water Substances 0.000 claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 28
- 239000003345 natural gas Substances 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 13
- 238000000151 deposition Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical group CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims description 2
- 239000001294 propane Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 6
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- 230000007613 environmental effect Effects 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- HTFVKMHFUBCIMH-UHFFFAOYSA-N 1,3,5-triiodo-1,3,5-triazinane-2,4,6-trione Chemical compound IN1C(=O)N(I)C(=O)N(I)C1=O HTFVKMHFUBCIMH-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
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- 238000011084 recovery Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- AJXONGJARXYRDO-YVNDNENWSA-N (4s)-4-amino-5-[[(2s)-1-[[(2s)-3-carboxy-1-[[(1s)-1-carboxy-2-methylpropyl]amino]-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-5-oxopentanoic acid Chemical compound CC(C)[C@@H](C(O)=O)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](N)CCC(O)=O AJXONGJARXYRDO-YVNDNENWSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
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- 229930195733 hydrocarbon Natural products 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a system for jointly utilizing an LNG receiving station gasification device and power plant circulating water, which comprises: the system comprises an IFV gasifier, a seawater circulating pump and a power plant circulating water system, wherein the power plant circulating water system comprises a circulating water cooling tower, a water tank below the tower, a water suction tank, a water taking pump and cooling water equipment for the power plant, which are sequentially connected. LNG utilizes the circulating backwater of the circulating water field of the power plant as a heat source, LNG itself receives heat and gasifies into NG, and meanwhile, cooled circulating backwater is sent back to the circulating water device of the power plant and used as cooling circulating water supply of a condenser and a heat exchanger of the power plant, so that energy is utilized in a cascade way. The IFV gasifier export sets up temperature control TCV valve aperture, ensures that the temperature of water that supplies with the power plant is in a lower within range, and this control interlock realizes whole control process through setting up temperature, flow transmitter and the PLC hard wire on IFV gasifier drain side pipeline.
Description
Technical Field
The invention relates to the field of LNG receiving station gasification devices and power plant circulating water systems, in particular to a system for jointly utilizing the LNG receiving station gasification devices and power plant circulating water, which can realize that the LNG receiving station gasification devices and the power plant share one water taking device.
Background
LNG is natural gas that exists in liquid form at low temperatures, with storage temperatures of about-162 ℃. In general, LNG is required to be re-gasified into gaseous natural gas for utilization, and an LNG receiving station is generally built at coastal and river-along ports, and a seawater intake pump is provided to gasify LNG by using seawater as a heat source, and the heat exchange requirements of a condenser, a heat exchanger and a boiler of a power plant also require that the site of the power plant is as close to a water source as possible. This creates the possibility of using a water-taking device in combination with an LNG receiving station and a power plant.
The cold energy stored in LNG is huge, and the recovery of the LNG has considerable economic and social benefits; conversely, if not recycled, this portion of the cold energy is typically lost with the seawater or air in the gasifier, which is wasteful.
Particularly, with the vigorous development of the domestic LNG receiving station in recent years as the spring bamboo shoots after raining, how to reasonably and economically utilize the low-temperature cold energy of LNG becomes the focus of attention of all construction parties. The domestic receiving station is a field, such as an east station, built into a low-temperature LNG air separation device, and the Zhoushan LNG receiving station is built into a set of devices for generating electricity and making ice by cold energy. Through years of practice and research, several technologies for LNG cold energy utilization have become mature, and new utilization schemes are also continuously proposed.
Besides energy conservation and emission reduction, the LNG cold energy utilization technology can also drive the development of related cold chain industries, such as: generating equipment, air separation, light hydrocarbon recovery, low-temperature crushing, sea water desalination, freezing, dry ice manufacturing and the like. In view of good environmental benefit and economic benefit of low-temperature LNG, especially under the development requirement of realizing sustainable development of economy, society and environment in the current stage of China, the development of cold energy utilization facilities of LNG receiving stations is an epoch requirement and a development requirement, and is a green project which is beneficial to China and people.
The large-scale power plant is a large household with water, the key equipment (condenser and heat exchanger) of the large household is cooled by using the cold energy of the circulating water, the water consumption requirement of the open cooling tower applied to the current power plant is very large, the water supplementing amount required by the closed circulating cooling tower (GEA system, hamong system and sea-tangle system) is very large, and meanwhile, the water quality required by water supplementing is also very high.
Traditional LNG receiving station site selection is close to the sea, utilizes sea water heat transfer, needs to build the sea water pipe network alone, draws the sea water to remove the IFV, sends the IFV drainage back to the sea water pipe network again, and the difference in temperature is only 5 ℃, is in order to guarantee that the change of temperature can not lead to the fact the influence to marine organism's existence. Under the premise, the required seawater amount of a single IFV gasifier (an intermediate medium gasifier) with 200t/h reaches 8000t/h.
When the two systems are independently implemented, the following problems are common in practical engineering cases:
1. the water demand of the power plant is large, and the circulating water cooling time is long;
2. the water demand of the LNG receiving station is large, and the independent discharge is limited by environmental protection temperature change;
3. the cooling water system of the power plant and the LNG receiving station are all required to be built with a water taking device and a seawater pipe network, related equipment, pipelines, meters, electricity and the like are involved, and the investment amount is large;
4. the economic benefit and the environmental benefit are both affected to a certain extent.
Disclosure of Invention
The invention aims to solve the technical problems, and provides an optimized LNG receiving station gasification device process system, and a necessary emergency stop system is arranged.
According to the present invention, there is provided a system for combined use of a gasification device of an LNG receiving station and circulating water of a power plant, the system comprising: the power plant circulating water system comprises a circulating water cooling tower, a water pool below the tower, a water absorbing pool, a water taking pump (sea water circulating pump) and various cooling water equipment of the power plant which are connected in sequence,
the natural gas inlet end of the IFV gasifier is connected with an LNG feeding pipe, the natural gas outlet end is connected with an NG discharging pipe, the seawater inlet end of the IFV gasifier is connected with a seawater pipe network from each water using device of the power plant, the seawater outlet end of the IFV gasifier is connected with a water absorbing tank of the power plant, the water absorbing tank is connected with each water using device of the power plant through a pipeline,
a seawater circulation pump for preventing silt from depositing in the gasifier pipe and a flow meter are arranged on the outlet pipe of the IFV gasifier, which can be started when detecting a low flow signal (for example, when the seawater flow is lower than 1000 m/h).
Further, a temperature detection, a transmitter and a Temperature Control Valve (TCV) are arranged on the seawater outlet side of the IFV gasifier, the opening of the TCV valve is automatically controlled through a hard wire, the opening of the valve is increased when the seawater temperature is lower than 5 ℃, the opening of the valve is reduced when the seawater temperature is higher than 5 ℃, seawater is sent into a power plant circulating water field pool (water absorption pool), low-temperature cooling water is sent into each heat exchanger of the power plant by using a circulating water pump arranged in the power plant for heat exchange, and high-temperature circulating water after heat exchange is returned to the IFV gasifier of the LNG receiving station to gasify LNG.
Further, a seawater volume flow meter is provided at the seawater inlet side of the IFV gasifier for directly metering seawater into the IFV gasifier inlet.
Further, an inlet shutoff valve is arranged on an LNG feeding pipe of a natural gas inlet end of the IFV gasifier, an outlet shutoff valve is arranged on an NG discharging pipe of a natural gas outlet end, when the seawater flow rate of the IFV gasifier is lower than a set value, a flowmeter detects a low-flow signal, the low-flow signal is transmitted to a central control room through a transmitter and an instrument cable, a low-flow alarm is sent out in a DCS system, and the inlet shutoff valve and the outlet shutoff valve of the IFV gasifier are closed through an SIS system interlock.
Further, a temperature detection transmitter is arranged at a seawater outlet of the IFV gasifier, after low temperature alarm is monitored, a signal is sent to an SIS system through an instrument cable, an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking mode, the heat exchange tube of the IFV gasifier is prevented from being affected by low temperature, and equipment is prevented from being frozen and disabled.
Further, a temperature detection transmitter is arranged at a seawater inlet of the IFV gasifier, after low temperature alarm is monitored, signals are sent to an SIS system through an instrument cable, an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking mode, the heat exchange tube of the IFV gasifier is prevented from being affected by low temperature, equipment is prevented from being frozen and deactivated, low temperature interlocking is arranged at the seawater inlet and outlet side, and safe operation of the IFV gasifier is effectively guaranteed.
In the circulating water system of the power plant, seawater enters a water tank below a circulating water cooling tower from a seawater supplementing self-water taking pump, then enters a water absorbing tank, enters all water equipment of the power plant through the circulating water pump, enters an IFV gasifier after exchanging heat through all water equipment of the power plant, and a seawater outlet of the IFV gasifier is connected with the water absorbing tank, so that a closed circulating bad water system is formed.
Further, the IFV gasifier intermediate medium is propane.
LNG utilizes the circulating backwater of the circulating water field of the power plant as a heat source, LNG itself receives heat and gasifies into NG, and meanwhile, cooled circulating backwater is sent back to the circulating water device of the power plant and used as cooling circulating water supply of a condenser and a heat exchanger of the power plant, so that energy is utilized in a cascade mode. When the seawater flow is less than 1000m g/h, a flow of 600 m is arranged outside the IFV gasifier to prevent the deposition of silt in the gasifier pipe 3 And/h, a seawater circulating pump, a matched control system, a pipeline system and the like. The IFV gasifier export sets up temperature control TCV valve aperture, ensures that the temperature of water that supplies with the power plant is in a lower within range, and this control interlock realizes whole control process through setting up temperature, flow transmitter and the PLC hard wire on IFV gasifier drain side pipeline.
The gasification device comprises an IFV gasifier, a seawater circulating pump, a process pipeline, a valve, a meter and a corresponding control interlocking system;
the power plant circulating water system comprises a circulating water cooling tower, a tower lower water tank, a water suction tank, a water taking pump, cooling water equipment for each power plant, a process pipeline, a valve, an instrument and a corresponding control system.
The system is suitable for projects where a power plant is built adjacent to an LNG receiving station.
The seawater flow of the drainage side of the IFV gasifier is controlled through temperature detection, a transmitter, a flowmeter and a regulating valve TCV arranged on the drainage side, after the seawater temperature of the drainage side of the IFV gasifier reaches a set value, the TCV valve is automatically opened, low-temperature circulating water is returned to an electric power plant, and the temperature of the circulating water supplied to the electric power plant is guaranteed to be controlled to be about 5 ℃.
As the temperature difference of the water supply and return of the circulating water field is changed along with the change of seasons, the temperature difference change is larger, the power consumption month (7-8 months) of the peak in summer is particularly obvious, the water consumption of a single IFV gasifier is further reduced along with the increase of the temperature difference of the seawater, and the required seawater quantity is further reduced, taking an IFV gasifier with 200t/h gasification quantity as an example, and the required circulating water is 4000t/h (the traditional method is 8000 t/h). On the other hand, the circulating water with too small flow flows into the IFV gasifier, the flow rate of the seawater is low, sediment deposition in the transition section of the seawater is easy to cause, and therefore operators of the LNG receiving station are required to clean the IFV gasifier regularly, and the operation cost is increased. In order to further solve the problem, the seawater circulating pump is additionally arranged on the seawater side of the IFV gasifier, a bypass pipeline is led to the seawater inlet of the IFV gasifier on the seawater outlet side of the IFV gasifier, the seawater internal circulation of the IFV gasifier is established, when the required circulating water quantity of the IFV gasifier is less than 1000 m/h, the seawater circulating pump is automatically started through the flowmeter detection, the transmitter and the DCS control interlocking system arranged on the seawater draining side of the IFV, the flow of the seawater circulating pump is regulated for a period of time later, the sediment deposition possibility of the transition section of the IFV gasifier is reduced, and the manual cleaning cost is reduced.
In order to ensure the safe operation of the IFV gasifier, a low-flow interlock and a low-temperature interlock are arranged at the inlet of the IFV gasifier (connected to the back flow line of the seawater circulating pump), and meanwhile, a low-temperature interlock is arranged at the inlet side of the seawater circulating pump, when an emergency working condition occurs, the detected temperature and flow signals are transmitted to an SIS system through a transmitter, and an ESDV valve at the inlet and the outlet of the IFV gasifier is closed in an emergency mode, so that the purpose of long-period safe operation of the IFV gasifier is achieved.
The LNG receiving station and the circulating water of the power plant circulating water device are combined to be utilized, so that the technology is a novel technology for utilizing cold energy of a large LNG receiving station, and is also a novel closed circulating system technology.
The invention has the following beneficial effects:
1. the overall investment of equipment, pipelines, electrical instruments, marine systems and sites is reduced;
2. a set of closed circulating water device is jointly shared, and energy steps are effectively utilized;
3. the closed circulation of the seawater avoids the limitation of temperature change in seawater drainage in environmental protection related strips;
4. a new technology for utilizing LNG cold energy is developed;
5. a novel closed circulating water system is developed.
Drawings
FIG. 1 is a schematic diagram of an LNG vaporization plant;
FIG. 2 is a schematic diagram of a power plant circulating water system.
The PIC0102 in FIG. 1 is an instrument for the whole control loop of the pressure sensing, transmitting system for controlling the opening of the FCV0101 valve by pressure indication; FIT0104 is an instrument used by a whole control loop of a pressure detection and transmission system for controlling the opening degree of an FCV0101 valve by flow indication; SSW0101 is a selection button for the remote selection of control loops by the central office operator; FXY0101 is a logic controller and is used for comparing three signals of temperature, pressure and flow, calculating a signal with larger deviation and sending the signal into a DCS; the FIC0101 is a flow indication control loop and is used for an operator to manually control the FCV 0101; FI0102 is an instrument (flowmeter) used by the whole control loop of the seawater outlet flow indication control seawater circulating pump flow detection and transmission system; the TICA0103 is used for indicating, controlling and alarming the temperature of the sea water outlet, detecting the temperature of the sea water outlet, controlling the opening of a valve TCV0101, and also sending the sea water outlet to an SIS system to switch an IFV gasifier inlet/outlet switch valve; FI0103 is used to indicate a flow meter for incoming seawater flow to the IFV gasifier and TIA0102 is used to indicate an alarm incoming IFV gasifier seawater temperature (temperature indication alarm loop).
Detailed Description
Next, this embodiment will be described in further detail with reference to fig. 1 and 2.
As shown in fig. 1, a system for combined utilization of an LNG receiving station gasification apparatus and power plant circulating water according to the present invention includes: the system comprises an IFV gasifier 1, a seawater circulating pump P-0101 and a power plant circulating water system, wherein the power plant circulating water system comprises a circulating water cooling tower C-0201, a tower lower water tank 3, a water suction tank 4, a water taking pump P-0201 and cooling water equipment 5 for each power plant;
the natural gas inlet end of the IFV gasifier is connected with an LNG feeding pipe, the natural gas outlet end of the IFV gasifier is connected with a NG discharging pipe, the seawater inlet end of the IFV gasifier is connected with a seawater pipe network from each water device of the power plant, the seawater outlet end of the IFV gasifier is connected with a water suction tank of the power plant, the water suction tank is connected with each water device of the power plant through a pipeline, a pressure regulating metering pry 2 is further arranged on the NG discharging pipe, flow signals fed back by the metering pry are transmitted to the LNG flow of the inlet of the IFV gasifier is regulated through a FIT0104 (flow indication controller) or a PIC0102 (pressure indication controller) to an FCV0101 valve control loop FIC0101, and the purpose of the NG outlet pressure and flow of the receiving station is controlled.
A seawater circulation pump P-0101 for preventing sediment from depositing in the gasifier pipe and a flowmeter FI-0102 are arranged on the outlet pipe of the IFV gasifier, and the flowmeter can start the seawater circulation pump P-0101 when detecting a low flow signal (e.g., when the seawater flow is below 1000 m/h). For example, when the IFV gasifier seawater flow is below 1000 m/h, the flowmeter detects a low flow signal, sends out a low flow alarm in the central control room, and turns on the seawater circulation pump P-0101 through hard-line interlock. In the normal operation process of the seawater circulating pump P-0101, the rotation speed of the seawater circulating pump is regulated and controlled through frequency conversion, and the seawater drainage is controlled. Meanwhile, the flow rate of the seawater entering the inlet side of the IFV gasifier is ensured to be more than 1000m and less than 1000 m/h, the long-term stable operation of the IFV gasifier is ensured, and the periodic cleaning cost is reduced.
In the circulating water system of the power plant, seawater enters a tower lower water tank 3 of a circulating water cooling tower C0201 from a seawater supplementing water self-taking pump, then enters a water absorbing tank 4, enters all water equipment 5 of the power plant through a circulating water pump P-0201, enters an IFV gasifier after exchanging heat through all water equipment 5 of the power plant, and a seawater outlet of the IFV gasifier is connected with the water absorbing tank, so that a closed circulating bad water system is formed.
According to one embodiment of the invention, a flow meter FI-0103 is provided at the seawater inlet side of the IFV gasifier to directly meter the amount of seawater into the IFV gasifier inlet, unlike conventional positioning in the seawater main.
Further, an inlet shutoff valve ESDV-0101 is arranged on an LNG feeding pipe of a natural gas inlet end of the IFV gasifier, an outlet shutoff valve ESDV-0102 is arranged on a NG discharging pipe of a natural gas outlet end, when the seawater flow rate of the IFV gasifier is lower than a set value, a flowmeter detects a low-low flow signal, the low-flow signal is transmitted to a central control room through a transmitter and an instrument cable, a low-flow alarm is sent out in a DCS system, and the inlet shutoff valve and the outlet shutoff valve ESDV-0101 and ESDV-0102 of the IFV gasifier are closed through an SIS system in an interlocking mode.
Further, a temperature detection, a transmitter (TICA 0103) and a Temperature Control Valve (TCV) are arranged on the seawater outlet side of the IFV gasifier, the opening of the TCV valve is automatically controlled through a hard wire, the opening of the valve is increased when the seawater temperature is lower than 5 ℃, the opening of the valve is reduced when the seawater temperature is higher than 5 ℃, the seawater is sent into a circulating water field pool (a water absorption pool) of a power plant, low-temperature cooling water is sent into each heat exchanger of the power plant by utilizing a circulating water pump P-0201 arranged in the power plant for heat exchange, and high-temperature circulating water after heat exchange is returned to the IFV gasifier of the LNG receiving station for degassing LNG.
Further, a temperature detection and transmission device (TICA 0103) is arranged at a seawater outlet of the IFV gasifier, after low temperature alarm is monitored, signals are sent to an SIS system through an instrument cable, and the IFV gasifier inlet and outlet shutoff valves ESDV-0101 and ESDV-0102 are closed in an interlocking mode, so that the heat exchange tubes of the IFV gasifier are prevented from being affected by low temperature, and equipment is prevented from being frozen and disabled.
Furthermore, a closed circulating water system is adopted, namely, the whole route from the IFV to the cooling water system is connected to form a whole set of closed circulating water flowing in the system, so that the influence of environmental protection departments on temperature rise limitation on water taking and draining of the LNG receiving station is avoided, and the influence of larger temperature rise change on marine organisms is reduced.
Advantages of the above system include:
(1) The LNG receiving station seawater gasification device and the power plant circulating water share one set of water taking equipment and system, so that the investment cost of the whole project can be reduced;
(2) The required seawater amount of the IFV gasifier is greatly reduced by 50 percent; meanwhile, the pipe diameter of the seawater pipeline can be further reduced, corresponding pipe fitting valves and the like are optimized, and the investment of the gasification device is further reduced;
(3) The temperature of the seawater subjected to heat exchange by the IFV heat exchanger is greatly reduced, and the seawater is returned to an electric plant to be used as a cold source of a circulating water system, so that the cooling time of circulating water can be reduced, the scale of a cooling tower can be reduced, the utilization efficiency of the whole circulating water system can be improved, and the investment of the electric plant can be further reduced;
(4) The energy consumption is reduced to a great extent, the environmental pollution is reduced, and the win-win of economic benefit and environmental benefit is realized;
(5) The influence of the temperature rise of 5 ℃ of the environment protection on the seawater direct discharge is avoided;
(6) Meanwhile, cascade utilization of cold energy and closed circulation of circulating water are realized, and the cold energy and the heat energy are effectively utilized.
The foregoing is only illustrative of the preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. A system for the combined use of an LNG receiving station gasification unit and power plant circulating water, the system comprising: the system comprises an IFV gasifier, a seawater circulating pump and a power plant circulating water system, wherein the power plant circulating water system comprises a circulating water cooling tower, a water tank below the tower, a water suction tank, a water taking pump and cooling water equipment for the power plant which are connected in sequence;
the natural gas inlet end of the IFV gasifier is connected with an LNG feeding pipe, the natural gas outlet end of the IFV gasifier is connected with an NG discharging pipe, the seawater inlet end of the IFV gasifier is connected with a seawater pipe network from each water-using device of the power plant, the seawater outlet end of the IFV gasifier is connected with a water absorption tank of a circulating water system of the power plant, and the water absorption tank is connected with each cooling water device of the power plant through a pipeline;
a seawater circulating pump and a flowmeter for preventing sediment from depositing in the pipe of the IFV gasifier are arranged on an outlet pipeline of the IFV gasifier, the flowmeter detects a low-flow signal, the seawater circulating pump is started when the seawater flow is lower than 1000 m/h,
the temperature detection, the transmitter and the temperature control valve are arranged at the sea water outlet side of the IFV gasifier, the valve opening of the temperature control valve is automatically controlled through a hard wire, the valve opening is increased when the sea water temperature is lower than 5 ℃, the valve opening is reduced when the sea water temperature is higher than 5 ℃, sea water is sent into a water suction pool of a circulating water system of a power plant, low-temperature cooling water is sent into each heat exchanger of the power plant for heat exchange by a circulating water pump arranged in the power plant, the high-temperature circulating water after heat exchange is returned to the IFV gasifier of an LNG receiving station to gasify LNG,
wherein the IFV gasifier intermediate medium is propane.
2. The system of claim 1, wherein a seawater volume flow meter is provided at the seawater inlet side of the IFV gasifier for directly metering into the IFV gasifier inlet.
3. The system of claim 2, wherein an inlet shutoff valve is provided on the LNG feed line to the natural gas inlet end of the IFV gasifier, an outlet shutoff valve is provided on the NG discharge line to the natural gas outlet end, and when the IFV gasifier seawater flow is below a set point, the flow meter detects a low flow signal, transmits the low flow signal to the central control room via the transmitter, instrument cable, sends a low flow alarm in the DCS system, and interlockingly closes the IFV gasifier inlet shutoff valve and outlet shutoff valve via the SIS system.
4. A system according to any one of claims 1 to 3, wherein a temperature detection and transmission device is arranged at the sea water outlet of the IFV gasifier, after a low temperature alarm is detected, a signal is sent to the SIS system through an instrument cable, and an inlet and outlet shutoff valve of the IFV gasifier is closed in an interlocking manner, so that the heat exchange tube of the IFV gasifier is not affected by low temperature, and the equipment is prevented from being frozen and disabled.
5. A system according to any one of claims 1 to 3, wherein a temperature detection and a transmitter are arranged at the seawater inlet of the IFV gasifier, a signal is sent to the SIS system through an instrument cable after the low temperature alarm is detected, the inlet and outlet shutoff valves of the IFV gasifier are closed by interlocking, the heat exchange pipes of the IFV gasifier are not affected by low temperature, the equipment is prevented from being stopped by freezing, and the low temperature interlocking is arranged at the seawater inlet and outlet sides, so that the safe operation of the IFV gasifier is ensured.
6. The system of claim 4, wherein a temperature detection and a transmitter are arranged at the seawater inlet of the IFV gasifier, after a low temperature alarm is detected, a signal is sent to the SIS system through an instrument cable, an inlet and outlet shutoff valve of the IFV gasifier is closed by interlocking, the heat exchange pipe of the IFV gasifier is not affected by low temperature, the equipment is prevented from being frozen and deactivated, and the low temperature interlocking is arranged at the seawater inlet and outlet sides, so that the safe operation of the IFV gasifier is ensured.
7. A system according to any one of claims 1-3, wherein in the power plant circulating water system, seawater is fed from a seawater make-up pump into a water tank under a circulating water cooling tower, then into a water suction tank, and enters each water device of the power plant through the circulating water pump, and enters an IFV gasifier after heat exchange by each water device of the power plant, and a seawater outlet of the IFV gasifier is connected with the water suction tank, thereby forming a closed circulating water system.
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| CN113432034B (en) * | 2021-05-25 | 2023-09-22 | 广汇能源综合物流发展有限责任公司 | Drainage system for recycling LNG gasification cold source and power plant heat source |
| CN115704529B (en) * | 2021-08-09 | 2024-04-30 | 中国石油天然气集团有限公司 | LNG constant temperature gasification's sea water heat transfer system |
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| CN106468191A (en) * | 2015-08-18 | 2017-03-01 | 中国石化工程建设有限公司 | LNG receiving station cold energy generation system |
| CN106122760A (en) * | 2016-06-22 | 2016-11-16 | 中国天辰工程有限公司 | The control system of a kind of LNG gasification process cold energy use and control method thereof |
| CN208779129U (en) * | 2018-08-01 | 2019-04-23 | 中国电力工程顾问集团华东电力设计院有限公司 | A kind of LNG gasification seawater taking and discharging system |
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