WO2022188188A1

WO2022188188A1 - Integrated intermediate fluid vaporizer having cold energy utilization function and power generation system composed of same

Info

Publication number: WO2022188188A1
Application number: PCT/CN2021/080656
Authority: WO
Inventors: 姚寿广; 张子敬; 李辰; 王梦迪; 沈晓宇; 毛惠艺
Original assignee: 江苏科技大学
Priority date: 2021-03-10
Filing date: 2021-03-15
Publication date: 2022-09-15
Also published as: CN112963731A; KR20220127803A; CN112963731B

Abstract

Disclosed in the present invention is an integrated intermediate fluid vaporizer having a cold energy utilization function, comprising a housing. The interior of the housing is divided by a first partition plate and a second partition plate to form an LNG vaporization heat exchange channel, an intermediate circulation medium heat exchange channel, and a heat source medium heat exchange channel which are sequentially arranged in parallel; a plurality of heat pipe assemblies penetrate through the first partition plate; the LNG vaporization heat exchange channel is provided with an LNG inlet and an NG outlet; the intermediate circulation medium heat exchange channel is provided with a low-pressure gaseous intermediate circulation medium inlet and a low-pressure liquid intermediate circulation medium outlet; the heat source medium heat exchange channel is divided into an intermediate circulation medium evaporation area and an NG temperature regulation area; the intermediate circulation medium evaporation area is provided with a high-pressure gaseous intermediate circulation medium outlet and a high-pressure liquid intermediate circulation medium inlet; the NG temperature regulation area is provided with a temperature regulator NG inlet and a temperature regulator NG outlet; and the temperature regulator NG inlet is connected to the temperature regulator NG outlet. Further disclosed in the present invention is a single-stage and multi-stage cascaded Rankine cycle power generation system composed of the vaporizer so as to adapt to different vaporization amount requirements and achieve gradient utilization of LNG cold energy.

Description

An integrated intermediate medium vaporizer with cold energy utilization and a power generation system composed thereof

technical field

The invention relates to a vaporizer and a power generation system, in particular to an integrated intermediate medium vaporizer with cold energy utilization and a power generation system composed thereof.

Background technique

Natural gas is usually stored and transported in the form of LNG. Before being transported to the user terminal, the LNG with a temperature of about -163 °C is increased to natural gas (NG) with a temperature of 10 °C to 25 °C, and the vaporization process is generally carried out in the LNG vaporizer. Since LNG contains 830-860 MJ/t of cooling capacity, the use of high-grade cold energy to build a cycle power generation system is the main way to utilize LNG cooling capacity on a large scale.

At present, there are three types of vaporizers commonly used in LNG terminals around the world, such as open rack vaporizer (ORV), submerged combustion vaporizer (SCV), intermediate heat transfer medium vaporizer (IFV), etc. Among them, the intermediate circulating medium vaporizer is characterized by its compact structure , It has the advantages of strong adaptability to seawater with different water quality and operating conditions, good economy, and can avoid the freezing point problem of heating fluid, so it has become the first choice for LNG vaporization.

However, most of the existing integrated intermediate circulation medium vaporizers (IFVs) use seawater to vaporize LNG. Although the vaporization efficiency is high, the structure is compact, and the operation is stable, a large amount of LNG vaporization cold energy cannot be directly utilized, and is brought into the sea by seawater. In order to utilize the cold energy of LNG vaporization, the integrated intermediate circulation medium vaporizer (IFV) can only be divided into traditional preheaters, evaporators, condensers and thermostats to form a split LNG cold energy power generation system. It increases the power consumption of the system, and brings about the problem of large footprint and space required. Although the problem of land receiving stations is not prominent, for LNG vaporization sites such as ships and offshore FSRU platforms that have strict constraints on floor space and space, the traditional LNG cold energy power generation system formed by split intermediate circulation medium vaporizers is difficult to even Not available.

The Chinese patent publication number CN110080846A proposes an integrated intermediate circulation medium vaporizer and power generation system with LNG cold energy utilization function using heat pipe technology. The equipment investment has been realized, and the goal of high efficiency, energy saving and emission reduction of the system has been achieved. However, this technical solution is only suitable for the case where the vaporization amount is relatively small, and the cold energy drawn from the intermediate circulation medium only constructs a single-stage Rankine cycle power generation system. It has the following two problems: 1. The condensation and evaporation of the intermediate circulating medium are placed in the middle second channel in the evaporator shell, which limits the divisibility of the condensation area and the evaporation area of the intermediate circulating medium, that is, the condenser is limited. and the number of evaporators. 2. The left side of the vaporizer shell runs through three channels for heat exchange through heat pipes, which not only brings about the number of heat sources for exchanging heat with LNG and the intermediate circulating medium, which cannot be adjusted, but can only be one type (such as seawater), but also makes the intermediate circulating medium The evaporation zone is also indivisible. However, due to the huge difference in the amount of LNG vaporization cooling energy in the application objects (for example, the tonnage of different ships is very different, and the main and auxiliary power LNG vaporization cooling energy of the configuration varies greatly), considering the efficient use of large vaporization capacity cooling energy, it is necessary to construct a second Stage or even three-stage cascaded Rankine power generation cycle, multiple condensers are necessary at this time, and condensers are also required for further utilization of low-grade LNG vaporization cold energy, and these condensers are arranged in sequence with LNG according to the temperature gradient. Therefore, the condensing zone in the vaporizer that exchanges heat with the LNG needs to be long enough to be divided into multiple condensing (condenser) zones. At the same time, the multi-stage cascaded Rankine cycle generally has multiple heat sources with different temperatures, and at this time, multiple evaporators corresponding to different circulating media are required. Obviously, the technical solutions of the above-mentioned patents cannot meet this requirement.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects of the prior art, the task of the present invention is to provide an integrated intermediate medium vaporizer with cold energy utilization that can adapt to the requirements of different vaporization amounts to construct an efficient utilization system of LNG cold energy. Another task of the present invention is to construct a power generation system using LNG cold energy according to the provision of an integrated intermediate medium vaporizer with cold energy that can adapt to different vaporization requirements.

The technical scheme of the present invention is as follows: an integrated intermediate medium vaporizer with cold energy utilization, comprising a shell, wherein the shell is separated by a first partition plate and a second partition plate to form LNG vaporization heat exchange channels arranged in sequence and an intermediate circulation A medium heat exchange channel and a heat source medium heat exchange channel, the first partition plate is provided with a plurality of through holes, and a plurality of heat pipe assemblies extend through the through holes from the LNG vaporization heat exchange channel to the intermediate circulation medium heat exchange channel , the casing is provided with an LNG inlet and an NG outlet located in the LNG vaporization heat exchange channel, and a low-pressure gaseous intermediate circulation medium inlet and a low-pressure liquid intermediate circulation medium outlet are located on the casing located in the intermediate circulation medium heat exchange channel, The seawater heat exchange channel is divided into an intermediate circulation medium evaporation area and a NG temperature adjustment area by a middle partition. The intermediate circulation medium evaporation area exchanges heat between the intermediate circulation medium and the heat source medium, and the NG temperature adjustment area consists of NG and NG. Heat source medium heat exchange, the shell is located in the intermediate circulation medium evaporation area with a high-pressure gaseous intermediate circulation medium outlet and a high-pressure liquid intermediate circulation medium inlet, and the shell is located in the NG temperature adjustment area with a temperature regulator NG inlet and an inlet. A thermostat NG outlet, the thermostat NG inlet is connected to the NG outlet.

Further, the first partition plate and the second partition plate are arranged in parallel in a horizontal direction.

Further, the through holes of the first separator are staggered in rows and columns.

Further, the heat pipe assembly is divided into several heat pipe groups. The heat pipe groups are arranged from the LNG inlet to the NG outlet. The boiling point of the working medium inside the heat pipes of the heat pipe group at the NG outlet increases sequentially.

Further, there are three heat pipe groups, including a first heat pipe group, a second heat pipe group and a third heat pipe group, the first heat pipe group is close to the LNG inlet, and the heat pipe working medium of the first heat pipe group is Methane, the third heat pipe group is close to the NG outlet, the heat pipe working medium of the third heat pipe group is propane, the second heat pipe group is located between the first heat pipe group and the third heat pipe group, The heat pipe working medium of the second heat pipe group is ethane.

Further, the intermediate circulation medium evaporation area is provided with a first heat source medium tube bundle, the NG temperature adjustment area is provided with a second heat source medium tube bundle, and the first heat source medium tube bundle and the second heat source medium tube bundle are arranged horizontally. .

Further, the intermediate circulating medium heat exchange channel is sequentially divided into a plurality of intermediate circulating medium condensation areas, and the separated intermediate circulating medium condensation areas are arranged in sequence from the LNG inlet side to the NG outlet side, close to the LNG inlet side. The temperature of the intermediate circulating medium in the intermediate circulating medium condensing zone on the side of the LNG inlet gradually increases toward the temperature of the intermediate circulating medium in the intermediate circulating medium condensing zone on the side close to the NG outlet. The circulating medium condensation zone is respectively provided with the low-pressure gaseous intermediate circulating medium inlet and the low-pressure liquid intermediate circulating medium outlet according to the countercurrent heat exchange with LNG.

Further, the intermediate circulation medium evaporation area is divided into a plurality of intermediate circulation medium evaporation sub-areas, and the separated intermediate circulation medium evaporation sub-areas are respectively provided with a high-pressure liquid intermediate circulation medium inlet and a high-pressure gaseous intermediate circulation medium outlet. The heat source medium is provided with inlet and outlet respectively according to the countercurrent heat exchange method with the circulating medium.

A power generation system includes an integrated intermediate medium vaporizer with cold energy utilization, a booster module composed of a working fluid pump, and a power module composed of a turbine, and the low-pressure liquid intermediate circulating medium outlet is connected to the booster module. Inlet, the outlet of the booster module is connected to the inlet of the high-pressure liquid intermediate circulation medium, the outlet of the high-pressure gaseous intermediate circulation medium is connected to the inlet of the power module, and the outlet of the power module is connected to the inlet of the low-pressure gaseous intermediate circulation medium , constitute a first-level Rankine cycle power generation system.

A power generation system, comprising an integrated intermediate medium vaporizer with cooling energy that divides an intermediate circulating medium condensation heat exchange channel into a plurality of intermediate circulating medium condensation zones in sequence according to the aforementioned method, a combined intermediate medium vaporizer, and a multi-condensed multi-purpose pump composed of two or more working fluid pumps. It is composed of a booster module with a liquid medium inlet and a power module with multiple gaseous medium outlets formed by combining two or more turbines. The low-pressure liquid intermediate circulating medium outlet of each intermediate circulating medium condensation area is connected to the The multi-channel liquid medium inlet of the booster module, the outlet of the booster module is connected to the high-pressure liquid intermediate circulation medium inlet of the intermediate circulation medium evaporation zone, the high-pressure gaseous intermediate circulation medium outlet is connected to the inlet of the power module, The power module forms multiple outlets and is respectively connected to the low-pressure gaseous intermediate circulation medium inlet of each intermediate circulation medium condensation zone, forming a multi-stage parallel cascaded Rankine cycle power generation system composed of a single circulating working medium.

A power generation system, comprising dividing the intermediate circulation medium condensation heat exchange channel and the intermediate circulation medium evaporation area into two areas (the first intermediate circulation medium condensation area and the second intermediate circulation medium condensation area, the first intermediate circulation medium condensation area, the first intermediate circulation medium condensation area The belt cooling energy of the medium evaporation zone and the second intermediate circulation medium evaporation zone) utilizes an integrated intermediate medium vaporizer, a first working fluid pump, a second working fluid pump, a first turbine and a second turbine, the said The intermediate circulation medium condensation heat exchange channel is divided into the first intermediate circulation medium condensation area and the second intermediate circulation medium condensation area, and the intermediate circulation medium evaporation area is divided into the first intermediate circulation medium evaporation area and the second intermediate circulation medium Medium evaporation area, the first intermediate circulating medium condensation area is close to the NG outlet side, and the second intermediate circulating medium condensation area is close to the LNG inlet side; the shell is located in the middle of the first type The circulating medium condensation area is provided with a first low-pressure gaseous intermediate circulating medium inlet and a first low-pressure liquid intermediate circulating medium outlet, and a second low-pressure gaseous intermediate circulating medium inlet and a second low-pressure gaseous intermediate circulating medium inlet and a second low-pressure gaseous intermediate circulating medium are arranged on the shell located in the second intermediate circulating medium condensation area. Two low-pressure liquid intermediate circulating medium outlets; the first intermediate circulating medium evaporation area is provided with a first high-pressure liquid intermediate circulating medium inlet and a first high-pressure gaseous intermediate circulating medium outlet. The end is provided with a first type of heat source medium inlet and a first type of heat source medium outlet; the second type of intermediate circulation medium evaporation area is provided with a second type of high-pressure liquid intermediate circulation medium inlet and a second type of high-pressure gaseous intermediate circulation medium outlet. The left and right ends of the countercurrent heat exchange mode are respectively provided with a second type of heat source medium inlet and a second type of heat source medium outlet, the first type of low-pressure liquid intermediate circulating medium outlet is connected to the inlet of the first working fluid pump, the first The outlet of the working fluid pump is connected to the inlet of the first high-pressure liquid intermediate circulating medium, the outlet of the first high-pressure gaseous intermediate circulating medium is connected to the inlet of the first turbine, and the exhaust of the first turbine The outlet is connected to the inlet of the first low-pressure gaseous intermediate circulating medium; the outlet of the second low-pressure liquid intermediate circulating medium is connected to the inlet of the second working fluid pump, and the outlet of the second working fluid pump is connected to the second working fluid pump. A high-pressure liquid intermediate circulating medium inlet, the second high-pressure gaseous intermediate circulating medium outlet is connected to the inlet of the second turbine, and the exhaust outlet of the second turbine is connected to the second low-pressure gaseous intermediate The circulating medium inlet constitutes a corresponding two-stage series cascaded Rankine cycle power generation system composed of two heat source mediums and two circulating working fluids.

A power generation system includes dividing the intermediate circulation medium condensation heat exchange channel and the intermediate circulation medium evaporation area into three areas (the circulation medium condensation area for other low-grade cold energy utilization, the first intermediate circulation medium condensation area and the second intermediate circulation medium condensation area. One intermediate circulation medium condensation area, the first intermediate circulation medium evaporation area, the third intermediate circulation medium evaporation area, the second intermediate circulation medium and the third intermediate circulation medium heat exchange to make the second intermediate circulation medium vaporize. The cooling energy of the evaporator) utilizes the integrated intermediate medium vaporizer, the first working fluid pump, the second working fluid pump, the third working fluid pump, the first turbine, the second turbine and the third turbine, The intermediate circulating medium condensation heat exchange channel is divided into a circulating medium condensation area for low-grade cold energy utilization, a first intermediate circulating medium condensation area and a second intermediate circulating medium condensation area, which are arranged in sequence. The used circulating medium condensation area is close to the NG outlet side, and the second intermediate circulating medium condensation area is close to the LNG inlet side; the intermediate circulating medium evaporation area is divided into the first intermediate circulating medium evaporation area, The third intermediate circulation medium evaporation area and the intermediate evaporation area, the intermediate evaporation area is used for the heat exchange between the second intermediate circulation medium and the third intermediate circulation medium to vaporize the second intermediate circulation medium. The first intermediate circulating medium condensation zone is provided with a first low-pressure gaseous intermediate circulating medium inlet and a first low-pressure liquid intermediate circulating medium outlet. a low-pressure gaseous intermediate circulation medium inlet and a second low-pressure liquid intermediate circulation medium outlet; the first type of intermediate circulation medium evaporation zone is provided with a first high-pressure liquid intermediate circulation medium inlet and a first high-pressure gaseous intermediate circulation medium outlet, The third type of intermediate circulation medium evaporation area is provided with a third high-pressure liquid intermediate circulation medium inlet and a third high-pressure gaseous intermediate circulation medium outlet; the intermediate evaporation area is provided with a second type of high-pressure liquid intermediate circulation medium inlet, a third type of high-pressure liquid intermediate circulation medium inlet, Two high-pressure gaseous intermediate circulating medium outlets, a third low-pressure gaseous intermediate circulating medium inlet and a third low-pressure liquid intermediate circulating medium outlet; the first low-pressure liquid intermediate circulating medium outlet is connected to the inlet of the first working fluid pump, so The outlet of the first working fluid pump is connected to the inlet of the first high-pressure liquid intermediate circulating medium, the outlet of the first high-pressure gaseous intermediate circulating medium is connected to the first turbine, and the exhaust of the first turbine is connected. The gas outlet is connected to the inlet of the first low-pressure gaseous intermediate circulating medium; the outlet of the second low-pressure liquid intermediate circulating medium is connected to the inlet of the second working fluid pump, and the outlet of the second working fluid pump is connected to the second working fluid pump. Two kinds of high-pressure liquid intermediate circulation medium inlets, the second type of high-pressure gaseous intermediate circulation medium outlet is connected to the second turbine, and the exhaust outlet of the second turbine is connected to the second low-pressure gaseous intermediate circulation medium The medium inlet; the outlet of the third low-pressure liquid intermediate circulating medium is connected to the inlet of the third working fluid pump, and the exhaust outlet of the third working fluid pump is connected to the inlet of the third high-pressure liquid intermediate circulating medium, so the third The outlet of the high-pressure gaseous intermediate circulating medium is connected to the third turbine, and the exhaust outlet of the third turbine is connected to the inlet of the third low-pressure gaseous intermediate circulating medium, forming two heat source media and three circulating working fluids Two parallel and two series cascaded Rankine cycle power generation systems.

Compared with the prior art, the present invention has the advantages that: in the present invention, the intermediate circulating medium after generating electricity by the turbine utilizes a large amount of cold energy released during the vaporization of LNG to be condensed and liquefied as a cold source, and then pressurized by the working fluid pump. Enter the vaporizer to exchange heat with the heat source medium for endothermic vaporization to realize continuous cycle power generation, which not only overcomes the inability of the original integrated intermediate circulating medium LNG vaporizer to utilize LNG vaporization cold energy, resulting in energy waste and a large amount of low-temperature heat source medium (such as: seawater) directly Compared with the existing LNG vaporization cold energy Rankine cycle power generation system, this new integrated vaporizer replaces the original LNG cold energy and uses all the preheaters in the low temperature Rankine cycle. , evaporator, condenser and thermostat constitute the LNG cold energy power generation system, which greatly saves equipment investment and reduces the floor space. In addition, compared with the Chinese Patent Publication No. CN110080846A, the present invention can adapt to the number of condensers and evaporators in the multi-stage series/parallel cascaded Rankine cycle constructed under the requirements of different vaporization amounts according to the amount of LNG vaporization. , by separating the corresponding number of condensation areas and the number of evaporation areas for the condensing/evaporating circulating medium of different needs by separating the channels of the intermediate circulating medium condensation area of the vaporizer and the intermediate circulating medium evaporation area at the lower left of the vaporizer for the entry and exit of the condensing/evaporating circulating medium, so that the LNG vaporization can be flexibly and conveniently The power generation system composed of multi-stage series/parallel Rankine cycle is composed of the size of the quantity, so as to realize the high-efficiency cascade utilization of cold energy.

In the present invention, three different heat pipe working fluids are used for the three groups of heat pipes according to the working temperature, so as to ensure that the three groups of heat pipes work normally during the heat exchange process and each heat exchange channel will not be blocked by ice. Through the NG temperature adjustment zone, the NG from the NG outlet of the vaporizer LNG channel can exchange heat with the heat source medium in the heat source medium heat exchange channel, so that the NG can further absorb heat and heat up to the set temperature, so as to facilitate subsequent use.

Description of drawings

FIG. 1 is a schematic structural diagram of a single-stage Rankine cycle power generation system composed of an integrated intermediate medium vaporizer with cold energy utilization according to the present invention.

FIG. 2 is a schematic diagram of the structure of the first separator.

3 is a schematic structural diagram of a two-stage parallel cascaded Rankine cycle power generation system composed of an integrated intermediate medium vaporizer with cold energy utilization and a single cycle working fluid.

FIG. 4 is a schematic structural diagram of a first combination mode of booster modules of a two-stage cascaded Rankine cycle power generation system.

FIG. 5 is a schematic structural diagram of a second combination of booster modules of a two-stage cascaded Rankine cycle power generation system.

FIG. 6 is a schematic structural diagram of a first combination mode of power modules of a two-stage cascaded Rankine cycle power generation system.

FIG. 7 is a schematic structural diagram of a second combination mode of power modules of a two-stage cascaded Rankine cycle power generation system.

8 is a schematic structural diagram of a three-stage parallel cascaded Rankine cycle power generation system composed of an integrated intermediate medium vaporizer with cold energy utilization and a single cycle working fluid.

FIG. 9 is a schematic structural diagram of a first combination mode of booster modules of a three-stage cascaded Rankine cycle power generation system.

FIG. 10 is a schematic structural diagram of a second combination of booster modules of a three-stage cascaded Rankine cycle power generation system.

FIG. 11 is a schematic structural diagram of a third combination of booster modules of a three-stage cascaded Rankine cycle power generation system.

FIG. 12 is a schematic structural diagram of a first combination mode of power modules of a three-stage cascaded Rankine cycle power generation system.

13 is a schematic structural diagram of a second combination mode of power modules of a three-stage cascaded Rankine cycle power generation system.

FIG. 14 is a schematic structural diagram of a third combination mode of power modules of a three-stage cascaded Rankine cycle power generation system.

FIG. 15 is a schematic structural diagram of an integrated intermediate medium vaporizer with cold energy utilization and a two-stage series cascaded Rankine cycle power generation system composed of two circulating working fluids.

FIG. 16 is a schematic structural diagram of an integrated intermediate medium vaporizer with cold energy utilization and a cascaded cycle power generation system composed of two heat source media and three circulating working fluids.

Detailed ways

The present invention will be further described below in conjunction with the examples, but it is not intended to limit the present invention.

Referring to FIG. 1 , the integrated intermediate medium vaporizer 1 with cold energy utilization involved in the present invention includes a casing 2 . The casing 2 is a rectangular assembly with the inlet and outlet faces of the working medium on both sides designed as semi-cylindrical shapes. The inner cavity of the body 2 is a heat exchange cavity, and the shell 2 is provided with a LNG vaporization heat exchange channel 3, an intermediate circulation medium heat exchange channel 4 and a heat source medium heat exchange channel 5 that divide the heat exchange cavity into parallel distribution. The first separator 6 and the second separator 7 . The first baffle 6 and the second baffle 7 are arranged horizontally and the casing 2 is fixed by welding. Therefore, the LNG vaporization heat exchange channel 3, the intermediate circulation medium heat exchange channel 4 and the heat source medium heat exchange channel 5 are up and down. Directions overlap. In the heat source medium heat exchange channel 5, there is also a middle partition plate 8 that divides the heat source medium heat exchange channel 5 into left and right sections, and the middle partition plate 8 is welded with the lower surface of the second partition plate 7 and the shell The inner wall of the body 2 is fixedly connected. The left part of the heat source medium heat exchange channel 5 is the intermediate circulation medium evaporation area 9 , and the right part is the NG temperature adjustment area 10 .

Referring to FIG. 2 , in this embodiment, a plurality of through holes 23 are opened on the first partition plate 6 , and these through holes 23 are arranged in a cross-arrangement, from the right (the side of the LNG inlet 11 ) to the through holes 23 . The first heat pipe group 24 , the second heat pipe group 25 , and the third heat pipe group 26 are inserted in the left side (the side of the NG outlet 12 ). The first heat pipe group 24 , the second heat pipe group 25 and the third heat pipe group 26 all extend through the first partition plate 6 from the LNG vaporization heat exchange channel 3 to the intermediate circulating medium heat exchange channel 4 . According to the temperature change after the LNG vaporization and heating up, three heat pipe group areas with different working media are set up. The working medium in the first heat pipe group 24 located near the LNG inlet 11 adopts methane, and the working medium in the second heat pipe group 25 in the middle adopts ethane. , the working medium of the third heat pipe group 26 near the NG outlet 12 uses propane. Different working fluids are used in each heat pipe, so as to ensure that each heat pipe works normally during the heat exchange process and each channel will not be blocked by ice.

An LNG inlet 11 and an NG outlet 12 are provided on both ends of the LNG heat exchange channel 3 on the shell 2 of the integrated intermediate circulation medium vaporizer 1, and a low pressure is provided on the shell 2 at both ends of the intermediate circulation medium heat exchange channel 4 Gaseous intermediate circulation medium inlet 13 and low pressure liquid intermediate circulation medium outlet 14 , and low pressure gaseous intermediate circulation medium inlet 13 is close to NG outlet 12 , and low pressure liquid intermediate circulation medium outlet 14 is close to LNG inlet 11 . In this embodiment, the low-pressure gaseous intermediate circulation medium inlet 13 and the NG outlet 12 are both located at the left end of the casing 2 , while the low-pressure liquid intermediate circulation medium outlet 14 and the LNG inlet 11 are both located at the right end of the casing 2 .

A high-pressure liquid intermediate circulating medium inlet 19 and a high-pressure gaseous intermediate circulating medium outlet 20 are located in the intermediate circulating medium evaporation area 9 on the shell 2 , and a horizontal first heat source medium tube bundle is arranged in the intermediate circulating medium evaporation area 9. The first heat source medium The tube bundle is drawn from the casing to form the first heat source medium inlet 15 and the first heat source medium outlet 16; the casing 2 is located in the NG temperature adjustment zone 10 with a temperature regulator NG inlet 21 and a temperature regulator NG outlet 22, NG temperature regulation A horizontal second heat source medium tube bundle is arranged in the zone 10 , and the second heat source medium tube bundle is led out from the casing to form a second heat source medium inlet 17 and a second heat source medium outlet 18 .

The power generation system composed of the above-mentioned integrated intermediate medium vaporizer with cold energy utilization includes an integrated intermediate circulating medium vaporizer 1, a working fluid pump 27 and a turbine 28, wherein the working fluid pump 27 constitutes the intermediate circulating medium. The booster module S2, The turbine 28 constitutes a work module S1 that mediates the circulating medium. A turbine 28 is used between the low-pressure gaseous intermediate circulating medium inlet 13 and the high-pressure gaseous intermediate circulating medium outlet 20 to realize the work and circulation of the intermediate circulating medium, and the low-pressure liquid intermediate circulating medium outlet 14 and the high-pressure liquid intermediate circulating medium inlet 19 pass through A working fluid pump 27 realizes the pressurization and circulation of the intermediate circulating medium, and constitutes a single-stage organic Rankine power generation cycle system. For the intermediate circulating medium evaporation zone 9, the heat source medium goes through the tube bundle process, the intermediate circulating medium goes through the shell side, the high-pressure liquid intermediate circulating medium inlet 19 is connected to the working fluid pump 27, and the high-pressure gaseous intermediate circulating medium outlet 20 is connected to the turbine 28. For the NG temperature adjustment zone 10, the heat source medium goes through the tube bundle process, and the NG goes through the shell side. The NG inlet 21 of the thermostat is connected to the NG outlet 12 of the LNG heat exchange channel 3 through the temperature adjustment liquid inlet pipeline, so that the LNG heat exchange channel 3 The NG coming out of the NG outlet 12 exchanges heat with the heat source medium in the heat source medium heat exchange channel 5, so that the NG can further absorb heat and heat up to a set temperature, so as to facilitate subsequent use.

In the present embodiment, the working principle of the present invention is further described in detail by using propane as an intermediate circulating medium to form a single-stage organic Rankine cycle as an example:

LNG heat exchange process: LNG in the initial state (state parameters: 1.5MPa, about -162°C) flows in from the LNG inlet 11 on the right side of the shell 2, and the LNG flows through the first heat pipe group 24 in the heat exchange area at the front of the vaporizer, Fully absorb the heat released by propane; in the heat exchange area in the middle of the vaporizer, it becomes a gas-liquid two-phase state; when it flows to the heat exchange area at the rear of the vaporizer, it becomes a superheated NG state, and the LNG at this time becomes -50 ~ -45 ℃ Gaseous NG; gaseous NG flows into the NG temperature adjustment zone 10 through the NG temperature adjustment inlet pipe, and further absorbs heat to 5-15°C, and finally the heated NG flows out from the NG temperature adjustment outlet pipe for use by users.

Propane heat exchange process: low-temperature and low-pressure gaseous propane (state parameter: 0.11MPa, about -40°C) flowing out of the turbine 28 flows into the intermediate circulation medium heat exchange channel from the low-pressure gaseous intermediate circulation medium inlet 13 on the left side of the shell 2 4. Through the third heat pipe group 26, the second heat pipe group 25, and the first heat pipe group 24, the vaporized cold energy released by LNG is absorbed into a liquid state, and the liquid propane (state parameter: 0.1MPa, - 42°C) into the working fluid pump 27, after which the propane is pressurized by the working fluid pump 27 and then becomes a low-temperature and high-pressure liquid state (state parameter: 0.73MPa, about -42°C) from the high-pressure liquid intermediate of the intermediate circulating medium evaporation zone 9 The circulating medium inlet 19 flows into the shell side of the intermediate circulating medium evaporation zone 9, and exchanges heat with the heat source medium in the pipeline, and the liquid propane of low temperature and high pressure absorbs the heat of the heat source medium and becomes gaseous propane of high temperature and high pressure (state parameter: 0.73MPa, 15°C), and then flows out from the high-pressure gaseous intermediate circulating medium outlet 20, and drives the generator to work through the turbine 28 to generate electrical energy. At this time, the mechanical work that the turbine 28 can output is 13330kJ/h. , by adjusting the flow rate of propane entering the intermediate circulation medium heat exchange channel 4 to match the LNG vaporization amount, so as to realize the adjustment of real-time working conditions.

The heat exchange process of the heat source medium in the intermediate circulation medium evaporation zone 9: The heat source medium (eg: seawater state parameters: 0.1MPa, about 20°C) enters the heat source medium pipeline of the intermediate circulation medium evaporation zone 9 from the heat source medium inlet 15, and is connected with the shell. The high pressure and low temperature liquid propane in the process is heat exchanged to vaporize it, and the heat source medium seawater as the exothermic medium in the whole process is reduced from 20 ℃ to 14-15 ℃.

The heat exchange process of the heat source medium in the NG heat exchange area 10: the heat source medium also takes seawater (state parameter: 0.1MPa, about 20°C) from the heat source medium inlet 17 into the heat source medium pipeline of the NG heat exchange area 10, and is in the shell side. The NG carries out heat exchange to raise the temperature to the set temperature. During the whole process, the heat source medium seawater as the exothermic medium is reduced from 20°C to 14-15°C.

Since the first heat pipe group 24 , the second heat pipe group 25 and the third heat pipe group 26 only extend through the first partition 6 from the LNG vaporization heat exchange channel 3 to the intermediate circulation medium heat exchange channel 4 , and the intermediate circulation medium evaporation area 9 is a separate heat source medium tube bundle heat exchange area, so according to the number of condensers in the constructed multi-stage cascade cold energy utilization system, the corresponding number of intermediate circulating medium condensation heat exchange channels 4 can be separated for heat exchange with LNG as required. The condensed different circulating media can enter and exit. Similarly, depending on the number of evaporators in the cycle power generation system, it is only necessary to separate the corresponding number of the intermediate circulating medium evaporation area 9 for the in and out of the circulating medium that needs to exchange heat with the heat source medium. This structure arrangement is more suitable for different vaporization. To build a multi-stage cascaded cooling energy efficient utilization system under the demand of energy.

On the basis of the specific embodiment of the single-stage organic Rankine power generation cycle system when the LNG vaporization amount is small, when the vaporization amount increases, a single working fluid needs to be used to build a multi-stage (two-stage or three-stage) cascaded Rankine cycle To realize the cascade utilization of cold energy, specifically, the intermediate circulating medium condensation heat exchange channel 4 is divided into two or three sequentially arranged from the left (the side of the NG outlet 12) to the right (the side of the LNG inlet 11). The condensing area at the inlet and outlet of the refrigerant is then constructed, and then a two-stage or three-stage parallel cascaded Rankine cycle power generation system with a single working medium is constructed.

Referring to Fig. 3, when a two-stage parallel cascaded Rankine cycle power generation system is formed by a single working fluid, the intermediate circulating medium condensation heat exchange channel 4 is divided into a high temperature intermediate circulating medium condensation area 4a and a low temperature intermediate circulating medium arranged on the left and right. The condensation zone 4b, the high temperature intermediate circulating medium condensation zone 4a is close to the NG outlet, and the low temperature intermediate circulating medium condensation zone 4b is close to the LNG inlet. On the shell 2, a first low-pressure gaseous intermediate circulating medium inlet 13a is arranged at the left end of the high-temperature intermediate circulating medium condensation zone 4a, and a first low-pressure liquid intermediate circulating medium outlet 14a is arranged on the right end. The left end is provided with a second low-pressure gaseous intermediate circulating medium inlet 13b, and the right end is provided with a second low-pressure liquid intermediate circulating medium outlet 14b. The first low-pressure liquid intermediate circulating medium outlet 14a and the second low-pressure liquid intermediate circulating medium outlet 14b are both connected to the booster module S1 to pressurize the intermediate circulating medium, while the power module S2 forms two outputs that are respectively connected to the first low-pressure gaseous intermediate The circulating medium inlet 13a and the second low-pressure gaseous intermediate circulating medium inlet 13b, wherein the intermediate circulating medium temperature of the first low-pressure gaseous intermediate circulating medium inlet 13a is higher than the intermediate circulating medium temperature of the second low-pressure gaseous intermediate circulating medium inlet 13b. The combined structure of the working fluid pump of the booster module S1 of the two-stage cascaded Rankine cycle power generation system is shown in Figures 4 and 5. The booster module S1 includes a first working fluid pump 27a and a second working fluid pump 27b. The inlets of the working fluid pump 27a and the second working fluid pump 27b are respectively connected to the first low-pressure liquid intermediate circulating medium outlet 14a and the second low-pressure liquid intermediate circulating medium outlet 14b, and the outlets of the first working fluid pump 27a and the second working fluid pump 27b After the working medium is mixed, it is connected to the intermediate circulating medium evaporation zone 9; or the inlet of the second working medium pump 27b is connected to the second low-pressure liquid intermediate circulating medium outlet 14b, and the outlet working medium of the second working medium pump 27b is connected to the liquid from the first low-pressure liquid. The low-pressure liquid intermediate circulating medium from the intermediate circulating medium outlet 14a is mixed and connected to the inlet of the first working fluid pump 27a, and the outlet of the first working fluid pump 27a is then connected to the intermediate circulating medium evaporation zone 9. The turbine combination structure of the power module S2 of the two-stage cascaded Rankine cycle power generation system is shown in Figures 6 and 7. The power module S2 includes a first turbine 28a and a second turbine 28b, and the intermediate circulating medium evaporates The high-pressure gaseous intermediate circulating medium outlet 20 of zone 9 is connected to the first turbine 28a and the second turbine 28b, respectively, the exhaust outlet of the first turbine 28a is connected to the first low-pressure gaseous intermediate circulating medium inlet 13a, and the first turbine 28a is connected to the first low-pressure gaseous intermediate circulating medium inlet 13a. The exhaust outlet of the second turbine 28b is connected to the second low-pressure gaseous intermediate circulating medium inlet 13b, or the high-pressure gaseous intermediate circulating medium outlet 20 of the intermediate circulating medium evaporation zone 9 is connected to the first turbine 28a, the first turbine The exhaust outlet medium of the turbine 28a is divided into two streams, one is connected to the first low-pressure gaseous intermediate circulating medium inlet 13a, and the other is connected to the second turbine 28b to continue doing work, and the exhaust outlet of the second turbine 28b is connected to To the second low pressure gaseous intermediate circulating medium inlet 13b.

Referring to Fig. 8, when a three-stage parallel cascaded Rankine cycle power generation system is formed by a single working fluid, the intermediate circulation medium condensation heat exchange channel 4 is divided into a high temperature intermediate circulation medium condensation zone 4a, a middle temperature intermediate circulation medium condensing zone 4a arranged from left to right The intermediate circulating medium condensing zone 4b and the low-temperature intermediate circulating medium condensing zone 4c, the high-temperature intermediate circulating medium condensing zone 4a is close to the NG outlet, and the low-temperature intermediate circulating medium condensing zone 4c is close to the LNG inlet. On the shell 2, a first low-pressure gaseous intermediate circulating medium inlet 13a is arranged at the left end of the high-temperature intermediate circulating medium condensation zone 4a, and a first low-pressure liquid intermediate circulating medium outlet 14a is arranged on the right end; The left end is provided with a second low-pressure gaseous intermediate circulating medium inlet 13b, and the right end is provided with a second low-pressure liquid intermediate circulating medium outlet 14b; the left end of the housing 2 located in the low-temperature intermediate circulating medium condensation zone 4c is provided with a third low-pressure gaseous intermediate circulating medium inlet 13c, and the right end is provided with a third low-pressure gaseous intermediate circulating medium inlet 13c. A third low-pressure liquid intermediate circulating medium outlet 14c is provided. The first low-pressure liquid intermediate circulating medium outlet 14a, the second low-pressure liquid intermediate circulating medium outlet 14b and the third low-pressure liquid intermediate circulating medium outlet 14c are all connected to the booster module S1 to pressurize the intermediate medium, and the power module S2 forms a three-way The outputs are respectively connected to the first low-pressure gaseous intermediate circulation medium inlet 13a, the second low-pressure gaseous intermediate circulation medium inlet 13b and the third low-pressure gaseous intermediate circulation medium inlet 13c, wherein the temperature of the intermediate circulation medium of the first low-pressure gaseous intermediate circulation medium inlet 13a is high At the temperature of the intermediate circulation medium at the second low pressure gaseous intermediate circulation medium inlet 13b, the intermediate circulation medium temperature at the second low pressure gaseous intermediate circulation medium inlet 13b is higher than that of the third low pressure gaseous intermediate circulation medium inlet 13c.

The combined structure of the working fluid pump of the booster module S1 of the three-stage parallel cascaded Rankine cycle power generation system is shown in Figures 9, 10 and 11. The booster module S1 includes a first working fluid pump 27a, a second working fluid The pump 27b and the third working fluid pump 27c, the inlets of the first working fluid pump 27a, the second working fluid pump 27b and the third working fluid pump 27c are respectively connected to the first low pressure liquid intermediate circulation medium outlet 14a, the second low pressure liquid intermediate circulation medium The medium outlet 14b and the third low-pressure liquid intermediate circulating medium outlet 14c, the outlet working fluids of the first working fluid pump 27a, the second working fluid pump 27b and the third working fluid pump 27c are mixed and connected to the intermediate circulating medium evaporation zone 9; or The inlet of the second working fluid pump 27b is connected to the second low-pressure liquid intermediate circulating medium outlet 14b, the inlet of the third working fluid pump 27c is connected to the third low-pressure liquid intermediate circulating medium outlet 14c, the second working fluid pump 27b and the third working fluid The outlet working fluid of the pump 27c is mixed with the working fluid from the first low-pressure liquid intermediate circulating medium outlet 14a and then connected to the inlet of the first working fluid pump 27a, and the outlet of the first working fluid pump 27a is then connected to the intermediate circulating medium evaporation zone 9 ; Or the inlet of the third working medium pump 27c is connected to the third low-pressure liquid intermediate circulating medium outlet 14c, and the outlet of the third working medium pump 27c is mixed with the working medium from the second low-pressure liquid intermediate circulating medium outlet 14b and is connected to the first The inlet of the second working fluid pump 27b and the outlet of the second working fluid pump 27b are connected to the inlet of the first working fluid pump 27a after mixing with the working fluid from the first low-pressure liquid intermediate circulating medium outlet 14a. The outlet is then connected to the intermediate circulating medium evaporation zone 9 .

The turbine assembly structure of the power module S2 of the three-stage parallel cascaded Rankine cycle power generation system is shown in Figures 12, 13 and 14. The power module S2 includes a first turbine 28a and a second turbine 28b and the third turbine 28c, the high-pressure gaseous intermediate circulating medium outlet 20 of the intermediate circulating medium evaporation zone 9 is respectively connected to the first turbine 28a, the second turbine 28b and the third turbine 28c, the first turbine The exhaust outlet of the turbine 28a is connected to the first low-pressure gaseous intermediate circulating medium inlet 13a, the exhaust outlet of the second turbine 28b is connected to the second low-pressure gaseous intermediate circulating medium inlet 13b, and the exhaust outlet of the third turbine 28c Connected to the third low-pressure gaseous intermediate circulating medium inlet 13c, or the high-pressure gaseous intermediate circulating medium outlet 20 of the intermediate circulating medium evaporation zone 9 is connected to the first turbine 28a, and the exhaust outlets of the first turbine 28a are respectively connected to The first low pressure gaseous intermediate circulating medium inlet 13a and the second turbine 28b and the third turbine 28c, the exhaust outlet of the second turbine 28b is connected to the second low pressure gaseous intermediate circulating medium inlet 13b, the third turbine The exhaust outlet of the turbine 28c is connected to the third low-pressure gaseous intermediate circulating medium inlet 13c, or the high-pressure gaseous intermediate circulating medium outlet 20 of the intermediate circulating medium evaporation zone 9 is connected to the first turbine 28a. The first turbine 28a The exhaust outlet is connected to the first low-pressure gaseous intermediate circulating medium inlet 13a and the second turbine 28b, and the exhaust outlet of the second turbine 28b is connected to the second low-pressure gaseous intermediate circulating medium inlet 13b and the third turbine 28c , the exhaust outlet of the third turbine 28c is connected to the third low-pressure gaseous intermediate circulating medium inlet 13c.

When the amount of LNG vaporization is relatively large and there are multiple heat source media at different temperatures, more reasonable energy cascade utilization can be achieved by heat exchange and vaporization of different intermediate cycle working fluids and heat source media with different temperatures, and two to three different cycles need to be arranged. The working fluid constructs a series/parallel cascade circulation system to realize the cascade utilization of cold energy. Specifically, as shown in Figure 15, when two series cascaded Rankine cycle power generation systems are formed by two heat source media and two circulating working fluids, the intermediate circulating medium condensation heat exchange channel 4 is divided into the first type arranged on the left and right. The intermediate circulating medium condensing zone 4a and the second intermediate circulating medium condensing zone 4b, the first intermediate circulating medium condensing zone 4a is close to the NG outlet, and the second intermediate circulating medium condensing zone 4b is close to the LNG inlet. The shell 2 is provided with a first low-pressure gaseous intermediate circulating medium inlet 13a at the left end of the condensation zone 4a of the first intermediate circulating medium, and a first low-pressure liquid intermediate circulating medium outlet 14a on the right end, and the shell 2 is located in the middle of the second medium. The left end of the circulating medium condensation zone 4b is provided with a second low-pressure gaseous intermediate circulating medium inlet 13b, and the right end is provided with a second low-pressure liquid intermediate circulating medium outlet 14b.

The intermediate circulation medium evaporation area 9 is divided into a first type of intermediate circulation medium evaporation area 9a and a second type of intermediate circulation medium evaporation area 9b arranged on the left and right. The left and right ends of the first type of intermediate circulation medium evaporation area 9a are respectively provided with a first type of heat source medium. The inlet 15a and the first heat source medium outlet 16a, while the left and right ends of the first intermediate circulation medium evaporation area 9a are respectively provided with the first high pressure liquid intermediate circulation medium inlet 19a and the first high pressure gaseous intermediate circulation medium outlet 20a; the second The second type of heat source medium inlet 15b and the second type of heat source medium outlet 16b are respectively provided at the left and right ends of the intermediate circulation medium evaporation area 9, while the left and right ends of the second type of intermediate circulation medium evaporation area 9b are respectively provided with a second type of high-pressure liquid intermediate The circulating medium inlet 19b and the second high-pressure gaseous intermediate circulating medium outlet 20b. The first low-pressure liquid intermediate circulating medium outlet 14a is connected to the inlet of the first working fluid pump 27a, the first working fluid pump 27a outlet is connected to the first high-pressure liquid intermediate circulating medium inlet 19a, and the first high-pressure gaseous intermediate circulating medium outlet 20a is connected to the first working fluid pump 27a. A turbine 28a, the exhaust outlet of the first turbine 28a is connected to the first low-pressure gaseous intermediate circulating medium inlet 13a. The second low-pressure liquid intermediate circulating medium outlet 14b is connected to the second working fluid pump 27b inlet, the second working fluid pump 27b outlet is connected to the second high-pressure liquid intermediate circulating medium inlet 19b, and the second high-pressure gaseous intermediate circulating medium outlet 20b is connected to the second working fluid pump 27b. The second turbine 28b, the exhaust of the second turbine 28b is connected to the second low-pressure gaseous intermediate circulating medium inlet 13b. That is, a two-stage series cascaded Rankine cycle power generation system composed of two heat source media and two circulating working fluids is realized.

Referring to Fig. 16, when a two-parallel (one bottom cycle + one top cycle) two-series cascaded Rankine cycle power generation system is composed of two heat source media and three circulating working fluids, the intermediate circulating medium condensing heat exchange channel 4 Divided into other low-grade cold energy utilization circulating medium condensation area 4a, first intermediate circulating medium condensation area 4b and second intermediate circulating medium condensation area 4c arranged from left to right, first intermediate circulating medium condensation area 4b In the center, the second intermediate circulating medium condensation zone 4c is close to the LNG inlet. The shell 2 is provided with a first low-pressure gaseous intermediate circulating medium inlet 13b at the left end of the condensation zone 4b of the first intermediate circulating medium, and a first low-pressure liquid intermediate circulating medium outlet 14b on the right end; the shell 2 is located in the middle of the second medium The left end of the circulating medium condensation zone 4c is provided with a second low-pressure gaseous intermediate circulating medium inlet 13c, and the right end is provided with a second low-pressure liquid intermediate circulating medium outlet 14c.

The intermediate circulating medium evaporation area 9 is divided into a first intermediate circulating medium evaporation area 9a and a third intermediate circulating medium evaporation area 9b arranged from left to right, and the second circulating medium and the third circulating medium heat exchange (so that the Evaporator 9c for the vaporization of two circulating media). The left and right ends of the first intermediate circulating medium evaporation area 9a are respectively provided with the first high-pressure liquid intermediate circulating medium inlet 19a and the first high-pressure gaseous intermediate circulating medium outlet 20a. The heat source medium inlet 15a and the first heat source medium outlet 16a; the left and right ends of the third type of intermediate circulation medium evaporation area 9b are respectively provided with a third type of high-pressure liquid intermediate circulation medium inlet 19b and a third high-pressure gaseous intermediate circulation medium outlet 20b. The left and right ends are respectively provided with a second type of heat source medium inlet 15b and a first type of heat source medium outlet 16b according to countercurrent heat exchange; At the gaseous intermediate circulating medium outlet 20c, the left and right ends are respectively provided with a third low-pressure gaseous circulating medium inlet 15c and a third low-pressure liquid circulating medium outlet 16c according to countercurrent heat exchange. The first low-pressure liquid intermediate circulating medium outlet 14b is connected to the inlet of the first working fluid pump 27a, the first working fluid pump 27a outlet is connected to the first high-pressure liquid intermediate circulating medium inlet 19a, and the first high-pressure gaseous intermediate circulating medium outlet 20a is connected to the first working fluid pump 27a. A turbine 28a, the exhaust outlet of the first turbine 28a is connected to the first low-pressure gaseous intermediate circulating medium inlet 13b; the second low-pressure liquid intermediate circulating medium outlet 14c is connected to the second working fluid pump 27b inlet, the second working medium The outlet of the mass pump 27b is connected to the inlet 19c of the second high-pressure liquid intermediate circulating medium. After vaporization in the evaporation zone 9c, the outlet 20c of the second high-pressure gaseous intermediate circulating medium is connected to the second turbine 28b, and the discharge of the second turbine 28b is The gas is connected to the second low-pressure gaseous intermediate circulating medium inlet 13c. The third high-pressure gaseous intermediate circulating medium outlet 20b is connected to the third turbine 28c, the exhaust of the third turbine 28c is connected to the third low-pressure gaseous circulating medium inlet 15c of the evaporation zone 9c, and the third low-pressure liquid circulating medium outlet 16c is connected to the inlet of the third working fluid pump 27c, and the outlet of the third working fluid pump 27c is connected to the third high-pressure liquid intermediate circulating medium inlet 19b of the third intermediate circulating medium evaporation zone 9b. That is, a cascade cycle power generation system composed of two heat source media and three circulating working fluids is realized.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims

An integrated intermediate medium vaporizer with cold energy utilization is characterized in that it includes a shell, and the shell is separated by a first partition plate and a second partition plate to form LNG vaporization heat exchange channels and intermediate circulating medium exchange channels arranged in parallel in sequence. A heat channel and a heat source medium heat exchange channel, the first partition plate is provided with a number of through holes, and a number of heat pipe assemblies extend through the through holes from the LNG vaporization heat exchange channel to the intermediate circulation medium heat exchange channel, so The shell is provided with an LNG inlet and an NG outlet located in the LNG vaporization heat exchange channel, and a low-pressure gaseous intermediate circulation medium inlet and a low-pressure intermediate circulation medium inlet and a low-pressure gaseous intermediate circulation medium are provided on the shell located in the intermediate circulation medium heat exchange channel in a countercurrent heat exchange manner with the LNG. The liquid intermediate circulation medium outlet, the heat source medium heat exchange channel is divided into the intermediate circulation medium evaporation area and the NG temperature adjustment area by the middle partition plate, the intermediate circulation medium evaporation area is heat exchanged by the intermediate circulation medium and the heat source medium, the NG The heat exchange between NG and the heat source medium is carried out in the temperature regulation zone. The shell is located in the intermediate circulation medium evaporation zone with a high-pressure gaseous intermediate circulation medium outlet and a high-pressure liquid intermediate circulation medium inlet. The shell is located in the NG temperature regulation zone. A thermostat NG inlet and a thermostat NG outlet are provided, and the thermostat NG inlet is connected to the NG outlet.
The integrated intermediate medium vaporizer with cold energy utilization according to claim 1, characterized in that, the first partition plate and the second partition plate are arranged in parallel in a horizontal direction.
The integrated intermediate medium vaporizer with cooling energy utilization according to claim 1, characterized in that, the through holes of the first separator are staggered in rows and columns.
The integrated intermediate medium vaporizer with cooling energy utilization according to claim 1, wherein the heat pipe assembly is divided into several heat pipe groups, and the heat pipe groups are arranged from the LNG inlet to the NG outlet, close to the The boiling point of the working medium in the heat pipe of the heat pipe group at the LNG inlet increases sequentially toward the boiling point of the working medium in the heat pipe of the heat pipe group close to the NG outlet.
The integrated intermediate medium vaporizer with cooling energy utilization according to claim 4, wherein there are three heat pipe groups, including a first heat pipe group, a second heat pipe group and a third heat pipe group, the first heat pipe group The first heat pipe group is close to the LNG inlet, the heat pipe working medium of the first heat pipe group is methane, the third heat pipe group is close to the NG outlet, the heat pipe working medium of the third heat pipe group is propane, and the second heat pipe group is propane. The group is located between the first heat pipe group and the third heat pipe group, and the heat pipe working medium of the second heat pipe group is ethane.
The integrated intermediate medium vaporizer with cooling energy utilization according to claim 1, wherein the intermediate circulation medium evaporation zone is provided with a first heat source medium tube bundle, and the NG temperature adjustment zone is provided with a second heat source medium tube bundle, The first heat source medium tube bundle and the second heat source medium tube bundle are arranged horizontally.
The integrated intermediate medium vaporizer with cooling energy utilization according to claim 1, wherein the intermediate circulating medium heat exchange channel is divided into several intermediate circulating medium condensing areas in sequence, and the several intermediate circulating medium condensing areas arranged separately Arranged in sequence from the LNG inlet side to the NG outlet side, the temperature of the intermediate circulating medium in the intermediate circulating medium condensation zone near the LNG inlet side increases to the middle near the NG outlet side. The temperature of the intermediate circulating medium in the circulating medium condensing zone increases sequentially, and each intermediate circulating medium condensing zone is provided with the low-pressure gaseous intermediate circulating medium inlet and the low-pressure liquid intermediate circulating medium outlet according to the countercurrent heat exchange with LNG.
The integrated intermediate medium vaporizer with cooling energy utilization according to claim 7, wherein the intermediate circulation medium evaporation area is divided into a plurality of intermediate circulation medium evaporation sub-areas, and the separated intermediate circulation medium evaporation sub-areas The high-pressure liquid intermediate circulation medium inlet and the high-pressure gaseous intermediate circulation medium outlet are respectively provided, and the heat source medium is respectively provided with an inlet and outlet according to the countercurrent heat exchange method with the circulating medium.
A power generation system, characterized in that it includes an integrated intermediate medium vaporizer with cold energy utilization as described in any one of claims 1 to 6, a booster module composed of a working medium pump, and a work force composed of a turbine module, the outlet of the low-pressure liquid intermediate circulating medium is connected to the inlet of the booster module, the outlet of the booster module is connected to the inlet of the high-pressure liquid intermediate circulating medium, and the outlet of the high-pressure gaseous intermediate circulating medium is connected to the outlet of the power module. The inlet, the outlet of the power module is connected to the inlet of the low-pressure gaseous intermediate circulation medium to form a one-stage Rankine cycle power generation system.
A power generation system, characterized in that it includes a pressure booster module with multiple liquid medium inlets, which is composed of an integrated intermediate medium vaporizer with cold energy utilization, two or more working medium pumps as described in claim 7, and two liquid medium inlets. The power module is composed of a combination of one or more turbines and contains multiple gaseous medium outlets. The low-pressure liquid intermediate circulating medium outlet of each intermediate circulating medium condensation zone is respectively connected to the multi-channel liquid medium inlet of the booster module. , the outlet of the booster module is connected to the high-pressure liquid intermediate circulation medium inlet of the intermediate circulation medium evaporation zone, the high-pressure gaseous intermediate circulation medium outlet is connected to the inlet of the power module, and the power module forms a multi-channel outlet connected to each other The low-pressure gaseous intermediate circulation medium inlet to each intermediate circulation medium condensation zone constitutes a multi-stage parallel cascaded Rankine cycle power generation system composed of a single circulating working medium.
A power generation system, characterized in that it comprises an integrated intermediate medium vaporizer with cold energy utilization as described in claim 8, a first working fluid pump, a second working fluid pump, a first turbine and a second turbine The intermediate circulation medium condensation heat exchange channel is divided into a first intermediate circulation medium condensation area and a second intermediate circulation medium condensation area, and the intermediate circulation medium evaporation area is divided into a first intermediate circulation medium evaporation area and a second intermediate circulation medium evaporation area. Two kinds of intermediate circulation medium evaporation areas, the first intermediate circulation medium condensation area is close to the NG outlet side, the second intermediate circulation medium condensation area is close to the LNG inlet side; The first intermediate circulation medium condensation zone is provided with a first low-pressure gaseous intermediate circulation medium inlet and a first low-pressure liquid intermediate circulation medium outlet, and a second low-pressure gaseous intermediate circulation is provided on the shell located in the second intermediate circulation medium condensation zone A medium inlet and a second low-pressure liquid intermediate circulation medium outlet; the first type of intermediate circulation medium evaporation area is provided with a first high-pressure liquid intermediate circulation medium inlet and a first high-pressure gaseous intermediate circulation medium outlet. A first type of heat source medium inlet and a first type of heat source medium outlet are provided at the left and right ends respectively; the second type of intermediate circulation medium evaporation area is provided with a second type of high-pressure liquid intermediate circulation medium inlet and a second type of high-pressure gaseous intermediate circulation medium. At the same time, according to the countercurrent heat exchange mode, the left and right ends are respectively provided with a second type of heat source medium inlet and a second type of heat source medium outlet, and the first type of low-pressure liquid intermediate circulating medium outlet is connected to the inlet of the first working fluid pump, The outlet of the first working fluid pump is connected to the inlet of the first high-pressure liquid intermediate circulating medium, the outlet of the first high-pressure gaseous intermediate circulating medium is connected to the inlet of the first turbine, and the first turbine The exhaust outlet of the machine is connected to the inlet of the first low-pressure gaseous intermediate circulating medium; the outlet of the second low-pressure liquid intermediate circulating medium is connected to the inlet of the second working fluid pump, and the outlet of the second working fluid pump is connected to The inlet of the second high-pressure liquid intermediate circulating medium, the outlet of the second high-pressure gaseous intermediate circulating medium is connected to the inlet of the second turbine, and the exhaust outlet of the second turbine is connected to the second turbine. The inlet of a low-pressure gaseous intermediate circulating medium constitutes a corresponding two-stage series cascaded Rankine cycle power generation system composed of two heat source media and two circulating working fluids.
A power generation system, characterized in that it includes an integrated intermediate medium vaporizer with cold energy utilization as described in claim 8, a first working fluid pump, a second working fluid pump, a third working fluid pump, and a first turbine. The intermediate circulating medium condensation heat exchange channel is divided into the circulating medium condensation area for low-grade cold energy utilization, the first intermediate circulating medium condensation area and the first intermediate circulating medium condensation area, which are arranged in sequence. Two kinds of intermediate circulating medium condensation areas, the circulating medium condensation area for low-grade cold energy utilization is close to the NG outlet side, and the second intermediate circulating medium condensation area is close to the LNG inlet side; the intermediate circulation medium condensation area is close to the LNG inlet side; The medium evaporation area is divided into a first intermediate circulation medium evaporation area, a third intermediate circulation medium evaporation area and an intermediate evaporation area, and the intermediate evaporation area is used for the heat exchange between the second intermediate circulation medium and the third intermediate circulation medium. The second type of intermediate circulation medium is vaporized, the casing is located in the condensation zone of the first intermediate circulation medium, and is provided with a first low-pressure gaseous intermediate circulation medium inlet and a first low-pressure liquid intermediate circulation medium outlet. The second type of intermediate circulation medium condensation area is provided with a second type of low-pressure gaseous intermediate circulation medium inlet and a second type of low-pressure liquid intermediate circulation medium outlet; the first type of intermediate circulation medium evaporation area is provided with a first type of high-pressure liquid intermediate A circulating medium inlet and a first high-pressure gaseous intermediate circulating medium outlet, the third intermediate circulating medium evaporation area is provided with a third high-pressure liquid intermediate circulating medium inlet and a third high-pressure gaseous intermediate circulating medium outlet; the intermediate evaporation The zone is provided with a second high-pressure liquid intermediate circulation medium inlet, a second high-pressure gaseous intermediate circulation medium outlet, a third low-pressure gaseous intermediate circulation medium inlet and a third low-pressure liquid intermediate circulation medium outlet; the first low-pressure liquid intermediate circulation medium The medium outlet is connected to the inlet of the first working medium pump, the outlet of the first working medium pump is connected to the inlet of the first high-pressure liquid intermediate circulating medium, and the outlet of the first high-pressure gaseous intermediate circulating medium is connected to the first medium. a turbine, the exhaust outlet of the first turbine is connected to the inlet of the first low-pressure gaseous intermediate circulating medium; the outlet of the second low-pressure liquid intermediate circulating medium is connected to the inlet of the second working fluid pump , the outlet of the second working fluid pump is connected to the inlet of the second high-pressure liquid intermediate circulating medium, the outlet of the second high-pressure gaseous intermediate circulating medium is connected to the second turbine, and the second turbine The exhaust outlet is connected to the inlet of the second low-pressure gaseous intermediate circulating medium; the outlet of the third low-pressure liquid intermediate circulating medium is connected to the inlet of the third working fluid pump, and the exhaust outlet of the third working fluid pump is connected to the inlet of the third high-pressure liquid intermediate circulating medium, the outlet of the third high-pressure gaseous intermediate circulating medium is connected to the third turbine, and the exhaust outlet of the third turbine is connected to the third The inlet of the low-pressure gaseous intermediate circulating medium constitutes a two-parallel two-series cascaded Rankine cycle power generation system composed of two heat source mediums and three circulating working fluids.