Long-distance heat conveying system and method based on heat separation principle

Abstract

The invention provides a long-distance heat conveying system and method based on the heat separation principle, the system comprises a hot-pressing conversion part, the hot-pressing conversion part is connected with a pressure-heat conversion part through a conveying part, heat is input into a heat exchanger and is output after exchanging heat with a working medium, and the working medium is driven by a working medium circulating pump to enter the heat exchanger to absorb heat and then is vaporized and boosted; after being cooled by a working medium cooler, the gas enters a working medium buffer tank and a working medium circulating pump to form closed-loop circulation, the turbo expander generates driving force to drive a gas compressor, the input gas is compressed and then enters a conveying pipeline, and the gas is conveyed for a long distance through the conveying pipeline and then enters a heat separator; cold output gas and hot output gas are output from the cold output gas end and the hot output gas end of the hot separator respectively, and the conveying process is completed; in the conveying process, pressure energy contained in gas and little heat energy are mainly conveyed, the pipeline resistance and the pipeline heat loss are smaller than those of warm water conveying, and therefore the conveying efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of low-temperature heat utilization and heat supply, and in particular to a long-distance heat transport system and method based on the heat separation principle. Background Art

[0002] In the process of comprehensive utilization of energy, it is necessary to transport heat energy from industrial enterprises such as thermal power plants and refineries to cities for heating through long-distance heating pipelines. This is a new path explored in many places in recent years. Practices in many places have proved that long-distance heating can greatly improve energy utilization efficiency and reduce carbon emissions while providing cities with diversified heat sources. It is becoming an economical, reliable, green and low-carbon new heating model. However, the longer the transmission distance, the greater the heat loss, the higher the technical requirements, and the more money it costs.

[0003] Therefore, there is an urgent need for a long-distance heat transport system and method based on the heat separation principle that can solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a long-distance heat transport system and method based on the heat separation principle to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The invention provides a long-distance heat transport system based on the heat separation principle, comprising a heat-pressure conversion part, wherein the heat-pressure conversion part is connected to a pressure-heat conversion part through a transport part.

[0007] Preferably, the heat-pressure conversion part includes a heat exchanger, which is respectively provided with a heat input end and a heat output end, and the heat exchanger is connected to a working fluid circulation pipeline, in which a turbine expander is provided, and the turbine expander is connected to a gas compressor drive and to a working fluid cooler, and the working fluid cooler is connected to a working fluid buffer tank, and the working fluid buffer tank is connected to a working fluid circulation pump, and the working fluid circulation pump is connected to the heat exchanger.

[0008] Preferably, the gas compressor is provided with a gas input end.

[0009] Preferably, the delivery part adopts a delivery pipeline.

[0010] Preferably, the pressure-heat conversion part comprises a heat separator, and the heat separator is provided with a cold output gas end and a hot output gas end.

[0011] The present invention also provides a long-distance heat transport method based on the heat separation principle, comprising: heat is input into a heat exchanger through a heat input end and then output through a heat output end; the working fluid enters the heat exchanger driven by a working fluid circulation pump to absorb heat and then vaporizes and increases pressure; then enters a turbine expander to expand and then cool; after being cooled by a working fluid cooler, it enters a working fluid buffer tank and a working fluid circulation pump to form a closed loop; the turbine expander generates a driving force to drive a gas compressor, compresses the gas input from the gas input end and then enters a transport pipeline; the gas enters a heat separator after being transported over a long distance through the transport pipeline; the cold output gas and the hot output gas are respectively output from the cold output gas end and the hot output gas end of the heat separator to complete the transport process.

[0012] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0013] The present invention provides a long-distance heat transportation system and method based on the heat separation principle. The system includes a heat-pressure conversion part, which is connected to the pressure-heat conversion part through a transportation part. Heat is input into a heat exchanger and then output after heat exchange with a working fluid. The working fluid enters the heat exchanger driven by a working fluid circulation pump to absorb heat and then vaporizes and increases pressure. Then, the working fluid enters a turbine expander to expand and then cools down. After being cooled by a working fluid cooler, the working fluid enters a working fluid buffer tank and a working fluid circulation pump to form a closed loop. The turbine expander generates a driving force to drive a gas compressor, compresses the input gas and then enters a transportation pipeline. After being transported a long distance through the transportation pipeline, the gas enters a heat separator, and the cold output gas and the hot output gas are respectively output from the cold output gas end and the hot output gas end of the hot separator to complete the transportation process. During the transportation process, the pressure energy and very little heat energy contained in the gas are mainly transported, and the pipeline resistance and pipeline heat loss are smaller than those of warm water transportation, thereby improving the transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 A schematic diagram of a long-distance heat transport system based on the heat separation principle provided by the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The purpose of the present invention is to provide a long-distance heat transport system and method based on the heat separation principle to solve the problems existing in the prior art.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Embodiment 1:

[0020] This embodiment provides a long-distance heat transport system based on the heat separation principle, such as Figure 1 As shown, it includes a heat-pressure conversion part, which is connected to the pressure-heat conversion part through a conveying part.

[0021] As an implementation mode, the heat-pressure conversion part includes a heat exchanger 1, which is respectively provided with a heat input end 2 and a heat output end 3. The heat exchanger 1 is connected to a working fluid circulation pipeline, in which a turbine expander 4 is provided. The turbine expander 4 is driven and connected to a gas compressor 5, and is connected to a working fluid cooler 6. The working fluid cooler 6 is connected to a working fluid buffer tank 7, the working fluid buffer tank 7 is connected to a working fluid circulation pump 8, and the working fluid circulation pump 8 is connected to the heat exchanger 1.

[0022] As an implementation mode, the gas compressor 5 is provided with a gas input end 9 .

[0023] As an implementation manner, the transporting part adopts a transporting pipeline 10 .

[0024] As an embodiment, the pressure-heat conversion part includes a heat separator 11 , and the heat separator 11 is provided with a cold output gas end 12 and a hot output gas end 13 .

[0025] The present embodiment also provides a long-distance heat transport method based on the heat separation principle using the above system, including three links: heat-pressure conversion, transportation and pressure-heat conversion. The heat-pressure conversion link is a process in which the working fluid participating in the Rankine cycle absorbs the heat of the heat source, circulates in a closed loop in the working fluid circulation pipeline, and the working fluid turbine drives the compressor to compress the gas. The transportation link is a process in which the compressed gas is transported. The pressure-heat conversion link is a process in which the compressed gas is converted from pressure energy to heat energy and cold energy in the heat separator. Specifically, heat is input into the heat exchanger 1 through the heat input end 2 to exchange heat with the working fluid, and then output through the heat output end 3. The working fluid enters the heat exchanger 1 driven by the working fluid circulation pump 8 to absorb heat. The gas is vaporized and pressurized, then enters the turbine expander 4 for expansion and cooling, and enters the working fluid buffer tank 7 and the working fluid circulation pump 8 after being cooled by the working fluid cooler 6 to form a closed-loop cycle. The turbine expander 4 generates a driving force to drive the gas compressor 5, which compresses the gas input from the gas input end 9 and enters the delivery pipeline 10. The gas enters the heat separator 11 after being transported over a long distance through the delivery pipeline 10, and the cold output gas and the hot output gas are output from the cold output gas end 12 and the hot output gas end 13 of the hot separator 11 respectively, completing the transportation process. During the transportation process, the pressure energy and very little heat energy contained in the gas are mainly transported. The pipeline resistance and pipeline heat loss are smaller than those of warm water transportation, thereby improving the transportation efficiency.

[0026] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A long distance heat transport system based on the heat separation principle, characterized in that: The invention comprises a heat-pressure conversion part, wherein the heat-pressure conversion part is connected with the pressure-heat conversion part through a conveying part.

2. The long-distance heat transport system based on the heat separation principle according to claim 1 is characterized in that: The heat-pressure conversion part includes a heat exchanger, which is respectively provided with a heat input end and a heat output end. The heat exchanger is connected to a working fluid circulation pipeline, and a turbine expander is arranged in the working fluid circulation pipeline. The turbine expander is connected to a gas compressor drive and is connected to a working fluid cooler. The working fluid cooler is connected to a working fluid buffer tank, and the working fluid buffer tank is connected to a working fluid circulation pump, and the working fluid circulation pump is connected to the heat exchanger.

3. The long-distance heat transport system based on the heat separation principle according to claim 1 is characterized in that: The gas compressor is provided with a gas input end.

4. The long-distance heat transport system based on the heat separation principle according to claim 1 is characterized in that: The conveying part adopts a conveying pipeline.

5. The long-distance heat transport system based on the heat separation principle according to claim 1 is characterized in that: The pressure-heat conversion part includes a heat separator, and the heat separator is provided with a cold output gas end and a hot output gas end.

6. A long distance heat transport method based on the heat separation principle, characterized in that: include: Heat is input into the heat exchanger through the heat input end and then exchanged with the working fluid and then output through the heat output end. Driven by the working fluid circulation pump, the working fluid enters the heat exchanger to absorb heat and then vaporizes and increases the pressure. Then it enters the turbine expander to expand and cool down. After being cooled by the working fluid cooler, it enters the working fluid buffer tank and the working fluid circulation pump to form a closed loop. The turbine expander generates a driving force to drive the gas compressor, compresses the gas input from the gas input end and then enters the transmission pipeline. After being transported over a long distance through the transmission pipeline, the gas enters the heat separator, and the cold output gas and the hot output gas are respectively output from the cold output gas end and the hot output gas end of the heat separator to complete the transportation process.

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