LNG gasification system utilizing low-temperature waste heat of circulating water of power plant

Abstract

The utility model relates to an LNG gasification system utilizing low-temperature waste heat of power plant circulating water. The LNG gasification system comprises a power plant circulating water system. One end of the diversion pipeline is communicated with a power plant circulating water system; the LNG receiving station comprises an LNG vaporizer and a receiving station drainage open channel, a water inlet of the LNG vaporizer is communicated with the other end of the water diversion pipeline, and a water outlet of the LNG vaporizer is communicated with a water inlet of the receiving station drainage open channel. The waste heat of the direct-current circulating water of the power plant is heated by the LNG to be effectively utilized, so that the waste heat is prevented from being directly discharged to the ocean to cause energy waste, and the energy utilization rate is increased; warm discharged water of the power plant is changed into cold discharged water after heating LNG, the cold discharged water is discharged into the ocean and unutilized direct-flow circulating water discharged into the ocean of a circulating water system of the power plant form a one-cold one-hot neutralization effect, so that the temperature of a water body finally discharged into the ocean is not obviously increased or decreased; and the marine ecology of the water area around the water outlet is hardly influenced.

Description

Technical Field

[0001] The present application relates to the technical field of waste heat utilization, and in particular to an LNG gasification system utilizing low-temperature waste heat from circulating water in a power plant. Background Art

[0002] In the related technology, DC circulating water is generated during the operation of the power plant. The temperature of DC circulating water is relatively high. In order to avoid the impact of warm drainage on the marine ecology around the drain outlet, the DC circulating water needs to be cooled before discharge. However, the DC circulating water absorbs heat during the cooling process and is directly discharged into the sea after absorbing heat, resulting in the inability to effectively utilize the low-temperature waste heat, which in turn causes energy waste. In addition, LNG (Liquefied Natural Gas) needs to be heated from -162°C to no less than 5°C during transportation. During the gasification process, about 860×103kJ / t of cold energy will be generated, which will be wasted, and the cold drainage will affect the marine ecology around the drain outlet. Utility Model Content

[0003] Based on this, it is necessary to provide an LNG gasification system that utilizes the low-temperature waste heat of circulating water in power plants to address the problem that the low-temperature waste heat of circulating water in the existing technology cannot be effectively utilized, resulting in energy waste and affecting the marine ecology around the drain outlet.

[0004] The present application provides an LNG gasification system utilizing low-temperature waste heat of circulating water in a power plant, which comprises:

[0005] A power plant circulating water system, wherein the power plant circulating water system is used to provide direct current circulating water;

[0006] a water diversion pipeline, one end of which is connected to the circulating water system of the power plant; and

[0007] An LNG receiving station, the LNG receiving station comprises an LNG vaporizer and an open drainage channel of the receiving station, the water inlet of the LNG vaporizer is connected to the other end of the water diversion pipeline, and the drainage outlet of the LNG vaporizer is connected to the water inlet of the open drainage channel of the receiving station.

[0008] When the LNG gasification system of the present scheme using the low-temperature waste heat of the power plant circulating water is working, the power plant circulating water system will produce high-temperature DC circulating water during operation, and the DC circulating water will further absorb heat during the cooling process. At this time, the DC circulating water flows into the LNG receiving station through the water diversion pipeline and is used by the LNG gasifier. The LNG gasifier uses the waste heat temperature of the DC circulating water to heat the LNG, so that the LNG is gasified and heated from -162°C to not less than 5°C during transportation. On the one hand, the waste heat temperature of the power plant DC circulating water is effectively utilized by heating the LNG, avoiding the direct discharge of this part of the waste heat temperature into the ocean to cause energy waste, thereby improving energy utilization; on the other hand, the warm wastewater of the power plant (i.e., DC circulating water) is heated by LNG to become cold wastewater, and the cold wastewater discharged into the ocean and the DC circulating water (i.e., warm wastewater) discharged into the ocean that is not utilized by the power plant circulating water system form a neutralization effect of one cold and one hot, so that the temperature of the water body finally discharged into the ocean does not have obvious warming or cooling, so that the marine ecology of the waters around the drainage outlet is almost not affected.

[0009] The technical solution of this application is further described below:

[0010] In one embodiment, the power plant circulating water system includes a power plant water diversion open channel and a condenser, wherein the water inlet of the power plant water diversion open channel extends into the sea, and the outlet of the power plant water diversion open channel is connected to the condenser.

[0011] In one embodiment, the power plant circulating water system further comprises a power plant drainage open channel, the water inlet of the power plant drainage open channel is connected to the condenser, and the drainage outlet of the power plant drainage open channel extends to the sea;

[0012] The power plant drainage open channel also includes an open channel extension port, and the open channel extension port is connected to the water diversion pipeline.

[0013] In one of the embodiments, the LNG receiving station further comprises a safety protection net, and the safety protection net is arranged at the front pipe end of the water diversion pipeline.

[0014] In one of the embodiments, the LNG receiving station further includes a partition well, which is disposed in the water diversion pipeline and is located between the safety protection net and the LNG gasifier.

[0015] In one of the embodiments, the LNG receiving station further includes a water intake pump room, which is disposed in the water diversion pipeline and is located between the partition well and the LNG gasifier.

[0016] In one of the embodiments, a water boosting device is provided in the water intake pump room.

[0017] In one of the embodiments, the LNG receiving station further includes a distance sensor and a warning alarm, wherein the distance sensor is disposed on the water diversion pipeline and is electrically connected to the warning alarm, and the warning alarm is disposed on the water diversion pipeline or surrounding facilities.

[0018] In one of the embodiments, the LNG receiving station further includes a drainage energy dissipation well, and the drainage energy dissipation well is connected between the LNG gasifier and the receiving station drainage open channel.

[0019] In one embodiment, the LNG vaporizer is an open-rack vaporizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a simplified structural diagram of an LNG gasification system utilizing low-temperature waste heat from power plant circulating water according to an embodiment.

[0023] Description of reference numerals:

[0024] 100. LNG gasification system using low-temperature waste heat from power plant circulating water; 10. Power plant circulating water system; 11. Power plant water diversion open channel; 12. Condenser; 13. Power plant drainage open channel; 131. Open channel extension; 20. Water diversion pipeline; 30. LNG receiving station; 31. LNG gasifier; 32. Receiving station drainage open channel; 33. Safety net; 34. Partition well; 35. Water intake pump room; 36. Drainage and energy dissipation well. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0031] See also Figure 1 , which is a simplified structural diagram of an LNG gasification system 100 that utilizes low-temperature waste heat of power plant circulating water, shown in one embodiment of the present application, and includes a power plant circulating water system 10, a water diversion pipeline 20, and an LNG receiving station 30.

[0032] The power plant circulating water system 10 is a component of the power plant, which is used to generate circulating water and provide a cooling source and water source for the operation of the power plant. It can be understood that the power plant includes a generator set in addition to the power plant circulating water system 10.

[0033] The power plant circulating water system 10 is used to provide direct current circulating water; one end of the water diversion pipeline 20 is connected to the power plant circulating water system 10; the LNG receiving station 30 includes an LNG vaporizer 31 and a receiving station drainage open channel 32, the water inlet of the LNG vaporizer 31 is connected to the other end of the water diversion pipeline 20, and the drainage outlet of the LNG vaporizer 31 is connected to the water inlet of the receiving station drainage open channel 32.

[0034] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: when the LNG gasification system 100 of the present solution that utilizes the low-temperature waste heat of the power plant circulating water is working, the power plant circulating water system 10 will generate direct current circulating water with a relatively high water temperature during operation, and the direct current circulating water will further absorb heat during the cooling process. At this time, the direct current circulating water flows into the LNG receiving station 30 through the water diversion pipeline 20 and is utilized by the LNG gasifier 31. The LNG gasifier 31 utilizes the waste heat temperature of the direct current circulating water to heat the LNG, so that the LNG is gasified and heated from -162°C to not less than 5°C during transportation. ℃, on the one hand, the waste heat temperature of the power plant's DC circulating water is heated by LNG and effectively utilized, avoiding the direct discharge of this part of the waste heat temperature into the ocean and causing energy waste, thereby improving energy utilization; on the other hand, the warm discharge water of the power plant (i.e., DC circulating water) is converted into cold discharge water after heating with LNG, and the cold discharge water discharged into the ocean forms a neutralization effect of one cold and one hot with the DC circulating water (i.e., warm discharge water) discharged into the ocean that is not utilized by the power plant's circulating water system 10, so that the temperature of the water body finally discharged into the ocean does not have obvious warming or cooling, which has almost no impact on the marine ecology of the waters around the outlet.

[0035] Please continue reading Figure 1In one embodiment, the power plant circulating water system 10 includes a power plant water diversion open channel 11 and a condenser 12. The water inlet of the power plant water diversion open channel 11 extends into the sea, and the outlet of the power plant water diversion open channel 11 is connected to the condenser 12. During operation, the seawater in the sea can be introduced into the power plant with the help of the power plant water diversion open channel 11, which reduces the difficulty of obtaining water sources. The temperature of the direct current circulating water generated after being used by the power plant is relatively high, and it needs to flow into the condenser 12 for cooling before being discharged into the ocean. That is, the condenser 12 is mainly used to cool the direct current circulating water.

[0036] Specifically, the DC circulating water temperature of the power plant is relatively high, the return water temperature of the condenser 12 is about 40°C, the circulating water outlet temperature is about 32°C (minimum 28°C), the warm wastewater temperature of the power plant is about 8° higher than the normal temperature seawater, and the cold wastewater temperature of the LNG gasifier 31 is about 10° lower than the warm wastewater temperature of the power plant. After being discharged into the ocean through the receiving station drainage open channel 32, the water temperature is close to normal temperature and has almost no impact on the ecology of the nearby sea areas.

[0037] Please continue reading Figure 1 On the basis of the above embodiment, the power plant circulating water system 10 further includes a power plant drainage open channel 13, the water inlet of the power plant drainage open channel 13 is connected to the condenser 12, and the drainage outlet of the power plant drainage open channel 13 extends to the sea.

[0038] The power plant drainage open channel 13 further includes an open channel extension port 131 , and the open channel extension port 131 is communicated with the water diversion pipeline 20 .

[0039] A portion of the generated direct current circulating water flows through the open channel extension port 131 to the water diversion pipeline 20 and then flows into the LNG receiving station 30 to be used for heating LNG through waste heat utilization; the remaining unused portion is discharged into the sea through the power plant drainage open channel 13 to achieve water resource recycling.

[0040] In addition, in another embodiment, the LNG receiving station 30 further includes a safety net 33, which is disposed at the front end of the water diversion pipeline 20. In actual work, the additional safety net 33 can effectively prevent personnel from being sucked into the water diversion pipeline 20, thereby preventing accidents of personal injury.

[0041] Specifically, the safety net 33 is installed at the front end of the water diversion pipe 20. The safety net 33 adopts a grid structure, which can be a stainless steel grid with high structural strength and good durability.

[0042] Furthermore, the LNG receiving station 30 also includes a distance sensor and a warning alarm. The distance sensor is arranged on the water diversion pipeline 20 and is electrically connected to the warning alarm. The warning alarm is arranged on the water diversion pipeline 20 or surrounding facilities. In actual work, if a person accidentally approaches the water diversion pipeline 20, the distance sensor installed on the water diversion pipeline 20 detects the person's approach, and then feeds back a signal to the warning alarm, which generates an alarm sound or a warning light, thereby better reminding the person not to approach the front end of the water diversion pipeline 20, and eliminating the potential safety hazard of being sucked into the water diversion pipeline 20.

[0043] For example, the distance sensor can be any one of, but not limited to, an infrared sensor, a laser sensor, etc.; the prompt alarm can be any one of, a sound alarm, a light alarm, an audible and visual alarm, etc., which can be flexibly selected according to actual needs.

[0044] Please continue reading Figure 1 In addition, in another embodiment, the LNG receiving station 30 further includes a partition well 34, which is disposed in the water diversion pipeline 20 and is located between the safety protection net 33 and the LNG vaporizer 31. The partition well 34 can be provided to conveniently physically isolate the power plant circulating water system 10 from the LNG receiving station 30, thereby protecting the power plant circulating water system 10 and the LNG receiving station 30 respectively.

[0045] On the basis of any of the above embodiments, the LNG receiving station 30 further includes a water intake pump room 35, which is arranged in the water diversion pipeline 20, and the water intake pump room 35 is located between the partition well 34 and the LNG vaporizer 31. A water boosting device is arranged in the water intake pump room 35. After the direct current circulating water reaches the water intake pump room 35, it can continue to flow into the LNG vaporizer 31 as a transfer, thereby reducing the length of the water diversion pipeline 20 and reducing the pipeline cost; and the direct current circulating water can also be pressurized by the water boosting device in the water intake pump room 35, so as to effectively overcome the friction resistance of the pipe wall, etc., and continue to flow into the LNG vaporizer 31 more effectively and smoothly.

[0046] Furthermore, the LNG receiving station 30 further includes a drainage energy dissipation well 36, which is connected between the LNG vaporizer 31 and the receiving station drainage open channel 32. The cold drainage energy dissipation well 36 discharged from the LNG vaporizer 31 can dissipate most of its energy during the water drop process, so that the cold drainage that finally flows into the ocean is stable, reducing oxygen bubbles and avoiding the impact on the marine ecology of the sea area around the drainage outlet.

[0047] Optionally, the LNG vaporizer 31 adopts an open rack vaporizer (ORV).

[0048] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An LNG gasification system utilizing low-temperature waste heat from power plant circulating water, characterized in that: include: A power plant circulating water system, wherein the power plant circulating water system is used to provide direct current circulating water; A water diversion pipeline, one end of which is connected to the circulating water system of the power plant; An LNG receiving station, the LNG receiving station comprising an LNG vaporizer and an open drainage channel of the receiving station, the water inlet of the LNG vaporizer being connected to the other end of the water diversion pipeline, and the drainage outlet of the LNG vaporizer being connected to the water inlet of the open drainage channel of the receiving station; and The power plant circulating water system comprises a power plant water diversion open channel and a condenser, wherein the water inlet of the power plant water diversion open channel extends into the sea, and the outlet of the power plant water diversion open channel is connected to the condenser; The power plant circulating water system further comprises a power plant drainage open channel, the water inlet of the power plant drainage open channel is connected to the condenser, and the drainage outlet of the power plant drainage open channel extends to the sea; The power plant drainage open channel also includes an open channel extension port, and the open channel extension port is connected to the water diversion pipeline.

2. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 1 is characterized in that: The LNG receiving station further comprises a safety protection net, which is arranged at the front pipe end of the water diversion pipeline.

3. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 2 is characterized in that: The LNG receiving station further comprises a partition well, which is arranged in the water diversion pipeline and is located between the safety protection net and the LNG gasifier.

4. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 3 is characterized in that: The LNG receiving station further comprises a water intake pump room, which is arranged in the water diversion pipeline and located between the partition well and the LNG gasifier.

5. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 4 is characterized in that: The water intake pump room is provided with water pressure boosting equipment.

6. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 2 is characterized in that: The LNG receiving station further comprises a distance sensor and a warning alarm. The distance sensor is arranged on the water diversion pipeline and is electrically connected to the warning alarm. The warning alarm is arranged on the water diversion pipeline or surrounding facilities.

7. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 1 is characterized in that: The LNG receiving station further comprises a drainage energy dissipation well, and the drainage energy dissipation well is connected between the LNG gasifier and the receiving station drainage open channel.

8. The LNG gasification system utilizing low-temperature waste heat of power plant circulating water according to claim 1 is characterized in that: The LNG gasifier is an open-frame gasifier.

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