阅读说明：本技术 一种带有绕管式换热器的lng冷能发电系统 (LNG cold energy power generation system with around tubular heat exchanger ) 是由 李文亮 李畅 曹传超 吉庆 叶发强 张静 于 2021-10-27 设计创作，主要内容包括：本发明公开了一种带有绕管式换热器的LNG冷能发电系统,包括循环泵、蒸发器、膨胀发电机组、冷凝器和复热器。循环泵用于输送发电工质；蒸发器为绕管式换热器,且包括进口连接至循环泵的出口的第一壳程和至少两个用于形成热源工质的流道的第一管程；膨胀发电机组的进口连接至第一壳程的出口,膨胀发电机组用于利用发电工质发电；冷凝器连接在膨胀发电机组的出口和循环泵的进口之间,用于利用LNG的冷能冷凝发电工质；复热器为绕管式换热器,且包括进口连接至冷凝器的用于输出天然气的出口的第二壳程和至少两个用于形成热源工质的流道的第二管程。根据本发明的发电系统,既能减少换热设备数量,又能对发电系统供给至少一种热源工质,可靠性高。(The invention discloses an LNG cold energy power generation system with a wound pipe type heat exchanger, which comprises a circulating pump, an evaporator, an expansion power generator set, a condenser and a reheater. The circulating pump is used for conveying power generation working media; the evaporator is a wound tube type heat exchanger and comprises a first shell side with an inlet connected to an outlet of the circulating pump and at least two first tube sides for forming a flow channel of a heat source working medium; an inlet of the expansion generator set is connected to an outlet of the first shell pass, and the expansion generator set is used for generating power by using a power generation working medium; the condenser is connected between the outlet of the expansion generator set and the inlet of the circulating pump and is used for condensing the power generation working medium by utilizing the cold energy of the LNG; the reheater is a wound-tube heat exchanger and comprises a second shell side with an inlet connected to an outlet of the condenser and used for outputting natural gas and at least two second tube sides used for forming a flow channel of a heat source working medium. According to the power generation system disclosed by the invention, the number of heat exchange equipment can be reduced, at least one heat source working medium can be supplied to the power generation system, and the reliability is high.)

1. An LNG cold energy power generation system with a coiled tube heat exchanger, the power generation system comprising:

the circulating pump is used for conveying power generation working media;

the evaporator is a wound tube type heat exchanger and comprises a first shell pass and at least two first tube passes, an inlet of the first shell pass is connected to an outlet of the circulating pump, and the first tube passes are used for forming a flow channel of a heat source working medium;

an inlet of the expansion generator set is connected to an outlet of the first shell pass, and the expansion generator set is used for generating power by utilizing the gaseous power generation working medium;

the condenser is connected between an outlet of the expansion generator set and an inlet of the circulating pump and is used for condensing the power generation working medium generated by power generation by using cold energy of LNG;

the reheater is a wound tube heat exchanger and comprises a second shell pass and at least two second tube passes, an inlet of the second shell pass is connected to an outlet of the condenser, the outlet is used for outputting natural gas, and the second tube passes are correspondingly communicated with the first tube passes and are used for forming a flow channel of the heat source working medium.

2. An LNG cold energy power generation system with a wound tube heat exchanger according to claim 1, wherein the condenser is a wound tube heat exchanger and comprises a third tube side for forming a flow path for LNG.

3. The LNG cold energy power generation system with the wound tube heat exchanger as claimed in claim 1, further comprising at least two heat source working medium supply pipelines correspondingly communicated with the second tube side, and a regulating assembly including a first regulating valve disposed on the heat source working medium supply pipeline.

4. An LNG cold energy power generation system with a wound tube heat exchanger according to claim 3, characterized in that the power generation system further comprises a first communication line provided between adjacent heat source working medium supply lines for communicating the adjacent heat source working medium supply lines, the adjustment assembly further comprises a second adjustment valve provided on the first communication line.

5. The LNG cold energy power generation system with the wound tube heat exchanger as recited in claim 1, further comprising at least two heat source working medium output pipelines correspondingly connected to the first tube side, and a third regulating valve disposed on the heat source working medium output pipeline.

6. An LNG cold energy power generation system with a wound tube heat exchanger as claimed in claim 5, characterized in that the power generation system further comprises a second communication pipeline arranged between the adjacent heat source working medium output pipelines for communicating the adjacent heat source working medium output pipelines, and the regulating assembly further comprises a fourth regulating valve arranged on the second communication pipeline.

7. An LNG cold energy power generation system with a wound tube heat exchanger according to any of the claims 1-6, characterized in that the power generation system further comprises a first bypass line connected to the outlet of the condenser and the inlet of the evaporator, and that a fifth regulating valve is arranged on the first bypass line.

8. An LNG cold energy power generation system with a wound tube heat exchanger according to any of the claims 1-6, characterized in that the power generation system further comprises a second bypass line connected to the outlet of the evaporator and the inlet of the condenser, and that a sixth regulating valve is arranged on the second bypass line.

9. An LNG cold energy power generation system with wound tube heat exchangers according to claim 3 or 4, characterized in that the heat source working fluid supply line is used for transporting at least one of sea water, hot water, steam and flue gas.

Technical Field

The invention belongs to the field of energy conservation and environmental protection, and particularly relates to an LNG cold energy power generation system with a wound pipe type heat exchanger.

Background

LNG (Liquefied Natural Gas) is increasing year by year as a clean and efficient energy source. Before use, LNG needs to be pressurized and gasified and then input into a pipe network. A large amount of usable cold energy can be released in the LNG gasification process, and the LNG gasification process is an effective way for fully utilizing the high-grade cold energy of the LNG to generate electricity.

The traditional LNG cold energy power generation system has the defects of more heat exchange equipment, large occupied area and complex system structure. And the heat source of the traditional LNG cold energy power generation system is generally seawater, when the temperature of the seawater is low due to the change of the environmental temperature, the temperature of the natural gas cannot meet the use requirement of network access, the power generation power of the power generation system can be correspondingly reduced, the design requirement cannot be met, and the reliability and the economical efficiency of the operation of the LNG cold energy power generation system are directly influenced.

To this end, the present invention provides an LNG cold energy power generation system with a coiled heat exchanger to at least partially solve the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, the present invention provides an LNG cold energy power generation system with a coiled pipe heat exchanger, the power generation system comprising:

the circulating pump is used for conveying power generation working media;

the evaporator is a wound tube type heat exchanger and comprises a first shell pass and at least two first tube passes, an inlet of the first shell pass is connected to an outlet of the circulating pump, and the first tube passes are used for forming a flow channel of a heat source working medium;

an inlet of the expansion generator set is connected to an outlet of the first shell pass, and the expansion generator set is used for generating power by utilizing the gaseous power generation working medium;

the condenser is connected between an outlet of the expansion generator set and an inlet of the circulating pump and is used for condensing the power generation working medium generated by power generation by using cold energy of LNG;

the reheater is a wound tube heat exchanger and comprises a second shell pass and at least two second tube passes, an inlet of the second shell pass is connected to an outlet of the condenser, the outlet is used for outputting natural gas, and the second tube passes are correspondingly communicated with the first tube passes and are used for forming a flow channel of the heat source working medium.

According to the LNG cold energy power generation system with the wound tube type heat exchanger, the evaporator is arranged to be the wound tube type heat exchanger comprising the first shell pass and the at least two first tube passes, the reheater is arranged to be the wound tube type heat exchanger comprising the second shell pass and the at least two second tube passes, the first shell pass is used for forming a flow channel of power generation working medium, the second shell pass is used for forming a flow channel of natural gas, the second tube pass is correspondingly communicated with the first tube pass and used for forming a flow channel of heat source working medium, so that the heat source working medium heats the power generation working medium and the LNG, the supply of the heat source working medium of the power generation system can be ensured under the condition that no heat exchange equipment is added, the structure of the power generation system is effectively simplified, the number and the floor area of the heat exchange equipment of the power generation system are reduced, at least one heat source working medium can be supplied to the power generation system, the influence of the ambient temperature on the power generation system is effectively reduced, and the temperature of the natural gas is ensured to meet the use requirement of network access, the generated power of the power generation system is ensured to reach the design value and maintain stable, and the operation reliability and economy of the power generation system are further ensured.

Optionally, the condenser is a coiled heat exchanger and includes a third tube side for forming a flow path for the LNG.

Optionally, the power generation system further includes an adjusting assembly and at least two heat source working medium supply pipelines, the heat source working medium supply pipelines are correspondingly communicated with the second tube pass, the adjusting assembly includes a first adjusting valve, and the first adjusting valve is arranged on the heat source working medium supply pipeline.

Optionally, the power generation system further includes a first communication pipeline, the first communication pipeline is disposed between the adjacent heat source working medium supply pipelines and is used for communicating the adjacent heat source working medium supply pipelines, and the adjusting assembly further includes a second adjusting valve, and the second adjusting valve is disposed on the first communication pipeline.

Optionally, the power generation system further includes an adjusting assembly and at least two heat source working medium output pipelines, the heat source working medium output pipelines are correspondingly communicated with the first tube pass, the adjusting assembly includes a third adjusting valve, and the third adjusting valve is arranged on the heat source working medium output pipeline.

Optionally, the power generation system further includes a second communication pipeline, the second communication pipeline is disposed between the adjacent heat source working medium output pipelines and used for communicating the adjacent heat source working medium output pipelines, and the adjusting assembly further includes a fourth adjusting valve, and the fourth adjusting valve is disposed on the second communication pipeline.

Optionally, the power generation system further includes a first bypass line, the first bypass line is connected to the outlet of the condenser and the inlet of the evaporator, and a fifth regulating valve is disposed on the first bypass line.

Optionally, the power generation system further includes a second bypass line, the second bypass line is connected to the outlet of the evaporator and the inlet of the condenser, and a sixth regulating valve is disposed on the second bypass line.

Optionally, the heat source working medium supply pipeline is used for conveying at least one heat source working medium of seawater, hot water, steam and flue gas.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

fig. 1 is a schematic diagram of an LNG cold energy power generation system with a coiled tube heat exchanger according to a preferred embodiment of the present invention.

Description of reference numerals:

100: the power generation system 110: circulating pump

120: the evaporator 121: first shell pass

122: the first pass 130: expansion generator set

131: the expander 132: generator

140: condenser 141: third shell pass

142: third pass 150: reheating device

151: second shell side 152: second tube pass

161: heat source working medium supply line 162: heat source working medium output pipeline

171: first regulating valve 172: second regulating valve

173: third regulating valve 174: fourth regulating valve

175: fifth regulating valve 176: sixth regulating valve

181: first communication pipe 182: second communicating pipe

191: first bypass line 192: second bypass line

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, for purposes of explanation, specific details are set forth in order to provide a thorough understanding of the present invention. It is apparent that the practice of the invention is not limited to the specific details set forth herein as are known to those of skill in the art. The following detailed description of the preferred embodiments of the present invention, however, the present invention may have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for purposes of illustration only and are not limiting.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

In the following, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the invention and do not limit the invention.

Referring to fig. 1, an LNG cold energy power generation system 100 with a wound tube heat exchanger according to a preferred embodiment of the present invention includes a circulation pump 110, an evaporator 120, an expansion-power unit 130, a condenser 140, and a recuperator 150.

The circulating pump 110, the evaporator 120, the expansion generator set 130 and the condenser 140 are connected in sequence to form an organic rankine cycle power generation loop of the LNG cold energy power generation system 100 with the coiled heat exchanger.

Specifically, the circulation pump 110 is used to deliver the low-boiling liquid organic power generation working medium to the evaporator 120.

The evaporator 120 is configured as a tube-wound heat exchanger and includes a first shell-side 121 and at least two first tube-sides 122. The inlet of the first shell side 121 is connected to the outlet of the circulation pump 110, and the low-boiling liquid organic power generation working medium flows into the first shell side 121 of the evaporator 120 through the circulation pump 110. The at least two first tube passes 122 are used to form a flow path for at least one heat source working fluid, such as seawater, hot water, steam, and flue gas. The power generation working medium in the first shell pass 121 is heated and gasified by the heat source working medium in the first tube pass 122, so that the temperature and the pressure of the gaseous power generation working medium at the outlet of the first shell pass 121 reach certain values to meet the power generation requirement.

An inlet of the expansion generator set 130 is connected to an outlet of the first shell pass 121, and the gaseous power generation working medium enters the expansion generator set 130 through the outlet of the first shell pass 121 and then expands to do work and generate power. Specifically, the expansion-generator set 130 may include an expander 131 and a generator 132. The generator 132 and the expander 131 may be connected by a drive shaft. The gaseous power generation working medium enters the expander 131 and expands to do work, and drives the generator 132 to generate power.

The condenser 140 is connected between the outlet of the expansion-generator set 130 and the inlet of the circulation pump 110. The generated power working medium enters the condenser 140 through the outlet of the expansion generator set 130, is condensed into a liquid state by using the cold energy of the LNG in the condenser 140, enters the inlet of the circulation pump 110, is boosted by the circulation pump 110, and then enters the first shell pass 121 of the evaporator 120 again for circulation. I.e. the power generating working fluid circulates according to the flow path indicated by the arrow ABCDEFA in fig. 1.

The cold source of the condenser 140 is LNG. The LNG may enter the condenser 140 via the LNG storage tank, and be heated and gasified in the condenser 140 by the power generation working medium to release cold energy, thereby cooling the power generation working medium. The outlet of the condenser 140 for outputting the natural gas is communicated with the reheater 150, so as to convey the natural gas into the reheater 150 to be heated continuously, so as to obtain the natural gas with a temperature meeting the requirement of network access, such as the natural gas with a temperature not lower than 0 ℃.

Specifically, the recuperator 150 is a coiled tube heat exchanger and includes a second shell side 151 and at least two second tube sides 152. An inlet of the second shell side 151 is connected to an outlet of the condenser 140 for outputting natural gas. The natural gas enters the second shell side 151 of the recuperator 150 via the outlet of the condenser 140 for export natural gas. The at least two second tube passes 152 are used to form a flow path for transporting at least one heat source working fluid, such as seawater, hot water, steam, and flue gas. The natural gas in the second shell pass 151 is continuously heated by the heat source working medium in the second tube pass 152, so that the natural gas with the temperature meeting the network access use requirement is obtained.

That is, after being heated and gasified by the power generation working medium in the condenser 140, the LNG enters the recuperator and is further heated by the heat source working medium into natural gas with the temperature not lower than 0 ℃, and then enters the natural gas transmission pipe network, namely, the natural gas flows according to the flow path shown by the arrow HIJ in fig. 1.

The second tube side 152 of the recuperator 150 is correspondingly communicated with the first tube side 122 of the evaporator 120 to form a flow channel of the heat source working medium. The heat source working medium generally enters the second tube pass 152 of the recuperator 150 through the heat source working medium supply pipeline 161, enters the first tube pass 122 of the evaporator 120 after exchanging heat with natural gas in the recuperator 150, continues to heat the power generation working medium, and then is output through the heat source working medium output pipeline 162. I.e. the heat source working fluid flows according to the flow path indicated by the arrow LMN in fig. 1.

In the embodiment shown in fig. 1, the evaporator 120 has three first tube passes 122, the recuperator 150 has three second tube passes 152, and the three second tube passes 152 and the three first tube passes 122 are in one-to-one correspondence. It is understood that, in the embodiment not shown, the first tube pass 122 and the second tube pass 152 may be provided in other numbers, such as four, five or six, and the like, and are not limited in detail herein.

According to the LNG cold energy power generation system 100 with the coiled tube heat exchanger of the present invention, the evaporator 120 is configured as a coiled tube heat exchanger including a first shell pass 121 and at least two first tube passes 122, the recuperator 150 is configured as a coiled tube heat exchanger including a second shell pass 151 and at least two second tube passes 152, the first shell pass 121 is used to form a flow channel of a power generation working medium, the second shell pass 151 is used to form a flow channel of natural gas heat, and the second tube pass 152 is correspondingly communicated with the first tube pass 122 to form a flow channel of a heat source working medium together to heat the power generation working medium and natural gas, which can ensure the supply of the heat source working medium to the power generation system 100 without increasing heat exchange equipment, effectively simplify the structure of the power generation system 100, reduce the number of heat exchange equipment and the floor area of the power generation system 100, supply at least one heat source working medium to the power generation system 100, and effectively reduce the influence of the ambient temperature and the seawater temperature on the power generation system 100, and the temperature of the natural gas is ensured to meet the requirement of network access, the generated power of the power generation system 100 is ensured to reach the design value and to be kept stable, and the operation reliability and the economical efficiency of the power generation system 100 are further ensured.

In addition, the evaporator 120 and the recuperator 150 are arranged as a coiled heat exchanger, so that the structures of the evaporator 120 and the recuperator 150 are more compact, the heat transfer area of the evaporator 120 and the recuperator 150 in unit volume is effectively increased, and the heat exchange efficiency between the heat source working medium and the power generation working medium and the natural gas is further improved. And the coiled tube heat exchanger is easy to be enlarged, so that the requirement of the power generation system 100 on high-load operation can be met by a single coiled tube evaporator 120 and a single coiled tube reheater 150 without adopting a plurality of heat exchange devices to operate in series or in parallel.

To further simplify the construction of the power generation system 100 and reduce the number of heat exchange devices in the power generation system 100, the condenser 140 is preferably configured as a coiled heat exchanger and includes a third shell-side 141 and a third tube-side 142. The inlet and outlet of the third shell side 141 are respectively connected to the outlet of the expansion generator set 130 and the inlet of the circulating pump 110 to form a flow channel of the power generation working medium. The inlet of the third tube-side 142 may be connected to an LNG storage vessel, such as an LNG storage tank, and the outlet of the third tube-side 142 is connected to the second shell-side 151 of the recuperator 150 to export natural gas. The LNG releases cold energy in the third tube pass 142 to cool the power generation working medium after expansion work.

The heat source working medium is delivered to the recuperator 150 through the heat source working medium supply line 161. The LNG cold power generation system with a wound tube heat exchanger 100 according to the present invention includes at least two heat source working medium supply lines 161. The heat source working medium supply pipeline 161 is communicated with the second tube pass 152 of the reheater 150 in a one-to-one correspondence manner, so as to convey at least one heat source working medium of seawater, hot water, steam, flue gas and the like to the second tube pass 152.

In the embodiment shown in fig. 1, there are three heat source working fluid supply lines 161, which are respectively communicated with the three second tube passes 152 of the recuperator 150. It is understood that, in the embodiment not shown, the heat source working medium supply pipes 161 may be provided in other numbers, such as four, five or six, and the like, and are not limited in detail here.

The operation of the power generation system 100 is regulated by the regulation assembly. The adjustment assembly includes a first adjustment valve 171 disposed on the heat source working fluid supply line 161 to adjust the opening of the heat source working fluid supply line 161 according to the demand of the power generation system 100. Next, the regulating action of the first regulating valve 171 on the power generation system 100 will be described by taking as an example the power generation system 100 having three heat source working medium supply lines 161 shown in fig. 1.

When the environmental temperature is high, the seawater temperature is correspondingly higher, and only the seawater can be used as the heat source working medium. According to the operation requirements of the power generation system 100, such as the temperature of the power generation working medium at the inlet of the expansion generator set 130 and the temperature requirement of the natural gas at the outlet of the second shell pass 151 of the recuperator 150, at least one of the three first regulating valves 171 is opened, and the opening degree of the first regulating valve 171 is regulated, so that a certain amount of seawater flows into at least one of the three heat source working medium supply pipelines 161, and the stable operation of the power generation system 100 is maintained.

When the environmental temperature is low, the seawater temperature is correspondingly low, and the operation requirement of the power generation system 100 is difficult to meet only by taking the seawater as the heat source working medium. In order to maintain the stable operation of the power generation system 100, at least two of the three first regulating valves 171 may be opened, and the opening degree of each first regulating valve 171 may be regulated, so that at least two of the three heat source working medium supply pipelines 161 may operate, and different kinds of heat source working media, such as seawater, hot water, steam, and flue gas, may be respectively delivered according to the temperature of the power generation working medium at the inlet of the expansion generator set 130 and the temperature requirement of the natural gas at the outlet of the second shell pass 151 of the recuperator 150.

The heat source working medium flows through the second tube pass 152 of the recuperator 150 and the first tube pass 122 of the evaporator 120, and then is output through the heat source working medium output pipeline 162. The LNG cold energy power generation system 100 with the coiled tube heat exchanger according to the present invention includes at least two heat source working medium output pipelines 162, and the heat source working medium output pipelines 162 are in one-to-one correspondence with the first tube pass 122 of the evaporator 120 to output at least one heat source working medium of seawater, hot water, steam, flue gas, and the like in the first tube pass 122.

In the embodiment shown in fig. 1, there are three heat source working medium output pipelines 162, which are respectively communicated with the three first tube passes 122 of the evaporator 120. It is understood that, in the embodiment not shown, the heat source working medium output pipelines may be provided in other numbers, such as four, five or six, and the like, and are not limited in detail here.

The adjusting assembly preferably further includes a third adjusting valve 173 disposed on the heat source working medium output pipeline 162 to adjust the number and the opening degree of the heat source working medium output pipeline 162 participating in the operation of the power generation system 100 according to the kind and the flow rate of the heat source working medium to be output.

Since the heat source working fluid output line 162 and the heat source working fluid supply line 161 are correspondingly communicated through the first tube side 122 and the second tube side 152, the opening and closing condition and the opening degree of the third regulating valve 173 can be kept consistent with the opening and closing condition and the opening degree of the first regulating valve 171.

The power generation system 100 preferably further includes a first communication line 181, and the first communication line 181 is disposed between the adjacent heat source working medium supply lines 161 for communicating the adjacent heat source working medium supply lines 161. The regulating assembly preferably further includes a second regulating valve 172 disposed on the first communication line 181.

When the same heat source working medium needs to be conveyed to the adjacent second tube pass 152 of the recuperator 150, only the first regulating valve 171 on one heat source working medium supply pipeline 161 is opened, and then the second regulating valve 172 on the first communication pipeline 181 between the heat source working medium supply pipelines 161 communicated with the adjacent second tube pass 152 is opened. This can reduce the number of power plants participating in the operation of the power generation system 100, for example, reduce the number of pumps that deliver heat source working fluid to the heat source working fluid supply line 161, thereby saving energy.

Further, the power generation system 100 further includes a second communication pipe 182. The second communication pipe 182 is disposed between the adjacent heat source working medium output pipes 162, and is used for communicating the adjacent heat source working medium output pipes 162. The regulator assembly correspondingly further includes a fourth regulator valve 174 disposed on the second communication line 182.

The second communication pipeline 182 and the fourth regulating valve 174 are arranged to enable the same heat source working medium flowing out of the adjacent first tube pass 122 of the evaporator 120 to be output from the same heat source working medium output pipeline 162, so as to perform subsequent processing on the output same heat source working medium.

Likewise, since the heat source working fluid output line 162 and the heat source working fluid supply line 161 are communicated through the first tube side 122 and the second tube side 152, the opening and closing condition and the opening degree of the fourth regulating valve 174 can be kept consistent with the opening and closing condition and the opening degree of the second regulating valve 172.

In addition, the power generation system 100 further includes a first bypass line 191 and a second bypass line 192.

A first bypass line 191 is connected to the outlet of the condenser 140 and the inlet of the evaporator 120, in particular to the outlet of the third shell-side 141 of the condenser 140 and the inlet of the first shell-side 121 of the evaporator 120. The adjustment assembly further comprises a fifth adjustment valve 175 arranged on the first bypass line 191.

The first bypass line 191 is used to regulate the flow of the power generation working medium entering the first shell side 121 of the evaporator 120 from the outlet of the circulation pump 110. If it is desired to reduce the flow of power generation fluid entering the first shell-side 121 of the evaporator 120 from the outlet of the circulation pump 110, the fifth regulating valve 175 is opened, and a portion of the power generation fluid entering the first shell-side 121 of the evaporator 120 at the outlet of the circulation pump 110 circulates along the flow path indicated by arrow ABCDEFA in fig. 1, and another portion of the power generation fluid entering the first bypass line 191 at the outlet of the circulation pump 110 circulates along the flow path indicated by arrow AOFA in fig. 1.

A second bypass line 192 is connected to the outlet of the evaporator 120 and the inlet of the condenser 140, specifically to the outlet of the first shell-side 121 of the evaporator 120 and the inlet of the third shell-side 141 of the condenser 140. The adjustment assembly also includes a sixth adjustment valve 176 disposed on the second bypass line 192.

The second bypass line 192 is opened when the power generation system 100 is in the non-power generation mode, and at this time, the expansion generator set 130 is in the closed state, the power generation working medium circularly flows along the flow path shown by arrow abcdefa in fig. 1, and the power generation system 100 is only used for gasifying LNG to obtain natural gas meeting the use requirement.

In addition, the opening and closing conditions and the opening degree of each regulating valve of the regulating assembly can be regulated through manual control, and the control system can also be arranged for automatic control.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "part," "member," and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.