Heat extraction system and heat extraction method

Abstract

The present application relates to heat extraction equipment, and discloses a heat extraction system and a heat extraction method. The system comprises a low-pressure steam unit, a deoxygenated water unit, a regeneration unit, a steam distribution unit, and pipelines capable of connecting the low-pressure steam unit, the deoxygenated water unit, the regeneration unit and the steam distribution unit; the pipelines comprise at least two pipeline liquid inlet sections connected between the deoxygenated water unit and the regeneration unit, at least two pipeline liquid outlet sections connected between the regeneration unit and the steam distribution unit, and liquid inlet section branch pipes connected to the liquid inlet sections; the pipeline liquid inlet sections and the pipeline liquid outlet sections are arranged in one-to-one correspondence, the liquid inlet section branch pipes are connected to the low-pressure steam unit, and the pipeline liquid outlet sections and one pipeline liquid inlet section not corresponding to the pipeline liquid outlet sections are connected through loop branch pipes. The system can meet the heat extraction requirements of the regeneration unit under different loads, thereby increasing the operation flexibility of the system, and the phenomena of deflection flow, dry burning and water hammer do not occur, and frequent leakage of the pipelines is avoided.

Description

Technical Field

[0001] This invention relates to a heat extraction device, and more specifically to a heat extraction system and a heat extraction method. Background Technology

[0002] In a gasoline adsorption desulfurization unit, the regenerator's role is to burn the zinc sulfide and coke in the adsorbent into zinc oxide and carbon dioxide through air, thus restoring the adsorbent's activity. The adsorbent regeneration process generates a significant amount of heat. To maintain the regeneration temperature, heat recovery coils are needed to remove excess heat. The heat recovery of these coils is related to factors such as the unit's processing capacity, the sulfur content of the feedstock, and the amount of coking in the adsorbent. To regulate heat recovery, 4-6 heat recovery coils are typically installed. In some units, to maintain heat recovery at low loads, the heat recovery coils can be cooled using deoxygenated water or by introducing steam. When the regenerator temperature is low, current technology reduces heat recovery by decreasing the feedwater / steam flow to the heat recovery coils or switching from deoxygenated water to steam. This leads to some coils burning dry due to uneven distribution of the heat recovery medium. When steam and water are used together, water hammer in the pipelines can easily occur, ultimately causing coil leaks. To avoid dry burning and water hammer, the regeneration temperature must be sacrificed, thus limiting the unit's operational flexibility. Summary of the Invention

[0003] The purpose of this invention is to overcome the problem that existing technologies cannot simultaneously satisfy the requirements of device operation flexibility and pipeline leakage prevention, and to provide a heat extraction system and method. This heat extraction system can meet the heat extraction requirements of the regeneration unit under different loads, thereby increasing the system's operational flexibility, and will not cause flow deviation, dry burning, or water hammer, thus avoiding frequent pipeline leakage.

[0004] To achieve the above objectives, the present invention provides a heat extraction system, comprising a low-pressure steam unit, a deoxygenated water unit, a regeneration unit, a steam separation unit, and a pipeline capable of connecting the low-pressure steam unit, the deoxygenated water unit, the regeneration unit, and the steam separation unit; the pipeline includes at least two inlet sections connected between the deoxygenated water unit and the regeneration unit, at least two outlet sections connected between the regeneration unit and the steam separation unit, and inlet branch pipes connected to each of the inlet sections; the inlet sections and outlet sections are arranged in a one-to-one correspondence; the inlet branch pipes are connected to the low-pressure steam unit to provide steam from the low-pressure steam unit to the regeneration unit through the inlet branch pipes and the inlet sections; the outlet sections and an inlet section not corresponding to the outlet section can be connected through a loop branch pipe to connect at least two outlet sections and at least two inlet sections in series.

[0005] Preferably, a low-pressure steam inlet valve is provided on the inlet branch pipe, a water inlet valve is provided on the inlet section of the pipeline between the inlet branch pipe and the deoxygenated water unit, a reflux valve is provided on the loop branch pipe, and an outlet valve is provided on the outlet section of the pipeline between the loop branch pipe and the steam separation unit or on the outlet section of the pipeline between the regeneration unit and the steam separation unit.

[0006] More preferably, a loop shut-off valve is provided in the inlet section of the pipeline between the inlet branch pipe and the loop branch pipe, a regeneration inlet valve is provided on the inlet section of the pipeline between the loop branch pipe and the regeneration unit or on the inlet section of the pipeline between the inlet branch pipe and the regeneration unit, and a regeneration outlet valve is provided in the outlet section of the pipeline between the loop branch pipe and the regeneration unit.

[0007] Preferably, the system further includes a room temperature gas supply unit, and the pipeline further includes a room temperature gas branch pipe connected to the room temperature gas supply unit so that the gas from the room temperature gas supply unit can be supplied to the regeneration unit through the room temperature gas branch pipe and the liquid inlet section of the pipeline.

[0008] Typically, the inlet section of the pipeline includes a first inlet section, a second inlet section, a third inlet section, and a fourth inlet section; the outlet section of the pipeline includes a first outlet section, a second outlet section, a third outlet section, and a fourth outlet section; and the return branch pipe includes a first return branch pipe connected between the first outlet section and the second inlet section, a second return branch pipe connected between the second outlet section and the third inlet section, and a third return branch pipe connected between the third outlet section and the fourth inlet section.

[0009] More preferably, the inlet section branch pipe includes a first inlet section branch pipe connected to the first pipe inlet section, a second inlet section branch pipe connected to the second pipe inlet section, a third inlet section branch pipe connected to the third pipe inlet section, and a fourth inlet section branch pipe connected to the fourth pipe inlet section.

[0010] The first liquid inlet section branch pipe, the second liquid inlet section branch pipe, the third liquid inlet section branch pipe and the fourth liquid inlet section branch pipe are respectively provided with a first low-pressure steam inlet valve, a second low-pressure steam inlet valve, a third low-pressure steam inlet valve and a fourth low-pressure steam inlet valve.

[0011] A first inlet valve is provided on the first inlet section of the pipeline between the first inlet section branch pipe and the deoxygenated water unit; a second inlet valve is provided on the second inlet section of the pipeline between the second inlet section branch pipe and the deoxygenated water unit; a third inlet valve is provided on the third inlet section of the pipeline between the third inlet section branch pipe and the deoxygenated water unit; and a fourth inlet valve is provided on the fourth inlet section of the pipeline between the fourth inlet section branch pipe and the deoxygenated water unit.

[0012] A first return valve, a second return valve, and a third return valve are respectively installed on the first circuit branch pipe, the second circuit branch pipe, and the third circuit branch pipe;

[0013] A first outlet valve is provided on the outlet section of the first pipeline between the first circuit branch pipe and the steam separation unit; a second outlet valve is provided on the outlet section of the second pipeline between the second circuit branch pipe and the steam separation unit; a third outlet valve is provided on the outlet section of the third pipeline between the third circuit branch pipe and the steam separation unit; and a fourth outlet valve is provided on the outlet section of the fourth pipeline.

[0014] Preferably, a first circuit shut-off valve is provided in the second pipeline inlet section between the second inlet section branch pipe and the first circuit branch pipe, a second circuit shut-off valve is provided in the third pipeline inlet section between the third inlet section branch pipe and the second circuit branch pipe, and a third circuit shut-off valve is provided in the fourth pipeline inlet section between the fourth inlet section branch pipe and the third circuit branch pipe.

[0015] A first regeneration inlet valve is provided on the first pipeline inlet section between the first inlet branch pipe and the regeneration unit; a second regeneration inlet valve is provided on the second pipeline inlet section between the first loop branch pipe and the regeneration unit; a third regeneration inlet valve is provided on the third pipeline inlet section between the second loop branch pipe and the regeneration unit; and a fourth regeneration inlet valve is provided on the fourth pipeline inlet section between the third loop branch pipe and the regeneration unit.

[0016] A first regeneration outlet valve is provided in the first pipeline outlet section between the first circuit branch pipe and the regeneration unit; a second regeneration outlet valve is provided in the second pipeline outlet section between the second circuit branch pipe and the regeneration unit; and a third regeneration outlet valve is provided in the third pipeline outlet section between the third circuit branch pipe and the regeneration unit.

[0017] A second aspect of the present invention provides a heat extraction method, employing the heat extraction system described in the first aspect above, the method comprising:

[0018] When the heat demand is greater than or equal to A% of the maximum heat output of the heat system, the deoxygenated water unit, the regeneration unit and the steam separation unit are connected to inject the deoxygenated water in the deoxygenated water unit into the steam separation unit after passing through the regeneration unit. The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes formed by at least two pipe inlet sections and at least two pipe outlet sections connected in series, as well as the flow rate in the pipes.

[0019] When the heat demand is less than A% of the maximum heat output of the heat system, the low-pressure steam unit, the regeneration unit and the steam separation unit are connected to inject the low-pressure steam from the low-pressure steam unit into the steam separation unit after passing through the regeneration unit. The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes formed by at least two pipe inlet sections, at least two pipe outlet sections and at least two inlet section branch pipes, as well as the flow rate in the pipes.

[0020] Preferably, when the heat demand is greater than or equal to B% of the maximum heat capacity of the heat extraction system, at least two inlet sections and at least two outlet sections of the pipe are connected in series to form at least two pipes, and at least two of the pipes are connected in parallel.

[0021] When the heat demand is greater than or equal to A% of the maximum heat capacity of the heat system and less than B%, at least two inlet pipes and at least two outlet pipes are connected in series to form at least two pipes. The pipes in the at least two pipes are connected in series to form a series pipe. The series pipes are connected in series or in parallel with each other or with any remaining pipes.

[0022] When the heat demand is greater than or equal to C% of the maximum heat capacity of the heat system and less than A%, at least two inlet pipes, at least two outlet pipes, and at least two inlet pipe branches are connected in series to form at least two pipes, and at least two of the pipes are connected in parallel.

[0023] When the heat demand is less than C% of the maximum heat capacity of the heat extraction system, at least two inlet pipes, at least two outlet pipes, and at least two inlet pipe branches are connected in series to form at least two pipes. The pipes in the at least two pipes are connected in series to form a series pipe. The series pipes are connected in series or in parallel with each other or with any remaining pipes.

[0024] Preferably, the inlet section of the pipeline includes a first inlet section, a second inlet section, a third inlet section, and a fourth inlet section; the outlet section of the pipeline includes a first outlet section, a second outlet section, a third outlet section, and a fourth outlet section; the return branch pipe includes a first return branch pipe connected between the first outlet section and the second inlet section, a second return branch pipe connected between the second outlet section and the third inlet section, and a third return branch pipe connected between the third outlet section and the fourth inlet section; the inlet section branch pipe includes a first inlet section branch pipe connected to the first inlet section, a second inlet section branch pipe connected to the second inlet section, a third inlet section branch pipe connected to the third inlet section, and a fourth inlet section branch pipe connected to the fourth inlet section.

[0025] When the heat demand is greater than or equal to B% of the maximum heat capacity of the heat extraction system, the first pipe formed by connecting the first pipe inlet section and the first pipe outlet section, the second pipe formed by connecting the second pipe inlet section and the second pipe outlet section, the third pipe formed by connecting the third pipe inlet section and the third pipe outlet section, and the fourth pipe formed by connecting the fourth pipe inlet section and the fourth pipe outlet section are connected in parallel.

[0026] When the heat demand is greater than or equal to D% of the maximum heat capacity of the heat extraction system and less than B%, the first pipe outlet section and the second pipe inlet section are connected in series through the first loop branch pipe, the third pipe outlet section and the fourth pipe inlet section are connected in series through the third loop branch pipe, and the series pipe formed by connecting the first pipe inlet section, part of the first pipe outlet section, the first loop branch pipe, part of the second pipe inlet section and the second pipe outlet section is connected in parallel with the series pipe formed by connecting the third pipe inlet section, part of the third pipe outlet section, the third loop branch pipe, part of the fourth pipe inlet section and the fourth pipe outlet section;

[0027] When the heat demand is greater than or equal to A% and less than D% of the maximum heat output of the heat extraction system, the first pipe inlet section, part of the first pipe outlet section, the first loop branch pipe, part of the second pipe inlet section, part of the second pipe outlet section, the second loop branch pipe, part of the third pipe inlet section, part of the third pipe outlet section, the third loop branch pipe, part of the fourth pipe inlet section, and the fourth pipe outlet section are connected in series.

[0028] When the heat demand is greater than or equal to C% of the maximum heat capacity of the heat extraction system and less than A%, the first pipe formed by connecting the first inlet section branch pipe and the first pipe outlet section, the second pipe formed by connecting the second inlet section branch pipe and the second pipe outlet section, the third pipe formed by connecting the third inlet section branch pipe and the third pipe outlet section, and the fourth pipe formed by connecting the fourth inlet section branch pipe and the fourth pipe outlet section are connected in parallel.

[0029] When the heat demand is greater than E% and less than C% of the maximum heat capacity of the heat extraction system, the pipe formed by connecting the first inlet branch pipe, part of the first pipe inlet section, part of the first pipe outlet section, the first loop branch pipe, part of the second pipe inlet section, and the second pipe outlet section in series, and the pipe formed by connecting the third inlet branch pipe, part of the third pipe inlet section, part of the third pipe outlet section, the third loop branch pipe, part of the fourth pipe inlet section, and the fourth pipe outlet section in series, are connected in parallel.

[0030] When the heat demand is less than or equal to E% of the maximum heat capacity of the heat extraction system, the first inlet section branch pipe, a portion of the first pipe inlet section, a portion of the first pipe outlet section, the first loop branch pipe, a portion of the second pipe inlet section, a portion of the second pipe outlet section, the second loop branch pipe, a portion of the third pipe inlet section, a portion of the third pipe outlet section, the third loop branch pipe, a portion of the fourth pipe inlet section, and the fourth pipe outlet section are connected in series.

[0031] Preferably, the system includes a room temperature gas supply unit, and the pipeline further includes a room temperature gas branch pipe, which is connected to the room temperature gas supply unit so that the gas from the room temperature gas supply unit can be supplied to the regeneration unit through the room temperature gas branch pipe and the liquid inlet section of the pipeline.

[0032] When the heat demand is less than or equal to E% of the maximum heat output of the heat system, the ambient temperature gas supply unit, the regeneration unit and the steam separation unit are connected to inject the gas in the ambient temperature gas supply unit into the steam separation unit after passing through the regeneration unit. The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes formed by at least two ambient temperature gas branch pipes, at least two pipe inlet sections and at least two pipe outlet sections, as well as the flow rate in the pipes.

[0033] The heat extraction system provided by this invention has the following technical effects:

[0034] By simultaneously setting up a low-pressure steam unit and a deoxygenated water unit, and controlling the connection between the low-pressure steam unit and the deoxygenated water unit and the regeneration unit through pipeline configuration, and by configuring multiple pipelines to be partially or fully connected in parallel or in series, the heat extraction range of the regeneration unit can be further increased, thereby further improving the adaptability of the regeneration unit to the heat extraction requirements under different loads. At the same time, the lower limit of heat extraction can be reduced to 1 / 4-1 / 6 of the existing system, and it is not necessary to limit the flow rate in the pipeline to a minimum value, which can prevent flow deviation, dry burning and water hammer in the pipeline, and avoid water pipe leakage.

[0035] Other advantages of the present invention and the technical effects of preferred embodiments will be further described in the following detailed description. Attached Figure Description

[0036] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0037] Figure 1 This is a schematic diagram of the heat extraction system provided in a specific embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures

[0039] 1. Low-pressure steam unit; 2. Deoxygenated water unit; 3. Regeneration unit; 4. Steam separation unit; 5. Piping;

[0040] 51. Inlet section of pipeline;

[0041] 51a First pipeline inlet section; 51b Second pipeline inlet section; 51c Third pipeline inlet section; 51d Fourth pipeline inlet section;

[0042] 52. Liquid outlet section of pipeline;

[0043] 52a First pipe outlet section; 52b Second pipe outlet section; 52c Third pipe outlet section; 52d Fourth pipe outlet section;

[0044] 53. Inlet section branch pipe;

[0045] 53a First inlet section branch pipe; 53b Second inlet section branch pipe; 53c Third inlet section branch pipe; 53d Fourth inlet section branch pipe;

[0046] 54-circuit branch pipe;

[0047] 54a First circuit branch pipe; 54b Second circuit branch pipe; 54c Third circuit branch pipe;

[0048] 61 Low-pressure steam inlet valve;

[0049] 61a First low-pressure steam inlet valve; 61b Second low-pressure steam inlet valve; 61c Third low-pressure steam inlet valve; 61d Fourth low-pressure steam inlet valve;

[0050] 62 Inlet Valve;

[0051] 62a First inlet valve; 62b Second inlet valve; 62c Third inlet valve; 62d Fourth inlet valve;

[0052] 63. Reflux valve;

[0053] 63a First reflux valve; 63b Second reflux valve; 63c Third reflux valve;

[0054] 64 Discharge valve;

[0055] 64a First outlet valve; 64b Second outlet valve; 64c Third outlet valve; 64d Fourth outlet valve;

[0056] 65-loop shut-off valve;

[0057] 65a First circuit shut-off valve; 65b Second circuit shut-off valve; 65c Third circuit shut-off valve;

[0058] 66 Regeneration Inlet Valve;

[0059] 66a First regeneration inlet valve; 66b Second regeneration inlet valve; 66c Third regeneration inlet valve; 66d Fourth regeneration inlet valve;

[0060] 67. Regeneration outlet valve;

[0061] 67a First regeneration outlet valve; 67b Second regeneration outlet valve; 67c Third regeneration outlet valve. Detailed Implementation

[0062] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to abutment; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] It should be understood that the terms "upper," "lower," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the directions or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0065] In one basic embodiment of the present invention, a heat extraction system is provided, including a low-pressure steam unit 1, a deoxygenated water unit 2, a regeneration unit 3, a steam separation unit 4, and a pipe 5 capable of connecting the low-pressure steam unit 1, the deoxygenated water unit 2, the regeneration unit 3, and the steam separation unit 4; the pipe 5 includes at least two pipe inlet sections 51 connected between the deoxygenated water unit 2 and the regeneration unit 3, at least two pipe outlet sections 52 connected between the regeneration unit 3 and the steam separation unit 4, and inlet valves connected to each pipe inlet section 51. The liquid section branch pipe 53, the inlet section 51 and the outlet section 52 are arranged in a one-to-one correspondence. The inlet section branch pipe 53 is connected to the low-pressure steam unit 1 so that the steam of the low-pressure steam unit 1 can be provided to the regeneration unit 3 through the inlet section branch pipe 53 and the inlet section 51. The outlet section 52 and an inlet section 51 that does not correspond to the outlet section 52 can be connected through the loop branch pipe 54 so that at least two outlet sections 52 and at least two inlet sections 51 can be connected in series.

[0066] Specifically, the pipeline 5 also includes a pipeline heat exchange section disposed inside the regeneration unit 3, and the pipeline heat exchange section is disposed in correspondence with the pipeline outlet section 52 and the pipeline inlet section 51 so as to be able to connect the corresponding pipeline outlet section 52 and pipeline inlet section 51.

[0067] When the heat extraction system provided by the above basic embodiment of the present invention is working, when the heat extraction demand is greater than or equal to A% of the maximum heat extraction capacity of the heat extraction system, the deoxygenated water unit 2, the regeneration unit 3 and the steam separation unit 4 are connected to allow the deoxygenated water in the deoxygenated water unit 2 to enter the steam separation unit 4 after passing through the regeneration unit 3. The actual heat extraction capacity is adjusted by regulating the series-parallel connection of at least two pipes 5 formed by at least two pipe inlet sections 51 and at least two pipe outlet sections 52 connected in series, as well as the flow rate in the pipes 5. When the heat extraction demand is less than A% of the maximum heat extraction capacity of the heat extraction system, the low-pressure steam unit 1, the regeneration unit 3 and the steam separation unit 4 are connected to allow the low-pressure steam in the low-pressure steam unit 1 to be injected into the steam separation unit 4 after passing through the regeneration unit. The actual heat extraction capacity is adjusted by regulating the series-parallel connection of at least two pipes 51, at least two pipe outlet sections 52 and at least two inlet section branch pipes 53 connected in series, as well as the flow rate in the pipes 5.

[0068] The maximum heat output of the heat extraction system refers to the heat output that the heat extraction system provided in the above embodiments of the present invention can achieve when at least two pipes 5 are connected in parallel and the flow rate of deoxygenated water in the pipes is at its maximum, with at least two inlet sections 51 and at least two outlet sections 52 connected in series.

[0069] Wherein, A is a definite numerical value, the value of which can be determined by those skilled in the art based on the actual situation. For example, it can be any value between 15 and 30, specifically 15, 16, 18, 20, 22, 24, 26, 28, 30, or any value between these values. As a specific embodiment of the present invention, A is 20.

[0070] In actual use, the inlet section 51 of the pipeline is connected to its corresponding outlet section 52 via the corresponding heat exchange section within the regeneration unit 3. The connection between the deoxygenated water unit 2, the regeneration unit 3, and the steam distribution unit 4 can be controlled by whether or not the connection between the low-pressure steam unit 1 and the inlet section branch pipe 53, and between the deoxygenated water unit 2 and the inlet section 51 is established. For example, when the deoxygenated water unit 2, the regeneration unit 3, and the steam distribution unit 4 need to be connected, at least one inlet section 51 is directly connected to the deoxygenated water unit 2, while the low-pressure steam unit 1 is not connected to the inlet section branch pipe 53; when the low-pressure steam unit 1, the regeneration unit 3, and the steam distribution unit 4 need to be connected, at least one low-pressure steam unit 1 is connected to the inlet section branch pipe 53, while the inlet section 51 and the deoxygenated water unit 2 are not connected. The connection or disconnection of the loop branch pipe 54 can control whether the pipes 5 are connected in series. For example, when the loop branch pipe 54 is connected, the fluid from the outlet section 52 of the pipe (connected to the first inlet section 51a) can enter an inlet section 51 (denoted as the second inlet section 51b) that is not connected to the outlet section 52, thus achieving series connection between different pipes 5. When the loop branch pipe 54 is not connected, the inlet section 51 of the pipe is connected to its corresponding outlet section 52 to form a pipe 5, and the liquids in different pipes 5 do not flow between each other, thus achieving parallel connection between different pipes 5. When the heat to be exchanged is large, the fluid flow rate in the pipe 5 is large; when the heat to be exchanged is small, the fluid flow rate in the pipe is small. The flow rate in the pipe 5 can be changed by any method that can change the flow rate in the pipe, such as adjusting the degree of opening of the valve or switch. When a large flow rate is needed, the degree of opening of the valve or switch is increased; when a small flow rate is needed, the degree of opening of the valve or switch is decreased.

[0071] The heat extraction system provided by the above basic embodiment, by simultaneously setting up a low-pressure steam unit 1 and a deoxygenated water unit 2, and controlling the connection of the low-pressure steam unit 1 and the deoxygenated water unit 2 to the regeneration unit 3 through the setting of the pipeline 5, and connecting the liquid outlet section 52 of the pipeline and a liquid inlet section 51 of the pipeline that does not correspond to the liquid outlet section 52 through a loop branch pipe 54, and controlling the partial or complete parallel connection or series connection of the pipeline 5 by whether the loop branch pipe 54 is open, can further increase the heat extraction range of the regeneration unit 3, thereby further improving the adaptability of the regeneration unit 3 to the heat extraction requirements under different loads, and does not require limiting the flow rate in the pipeline to a minimum value, which can prevent the occurrence of flow deviation, dry burning and water hammer in the pipeline 5, and avoid water pipe leakage.

[0072] According to the present invention, the connection or disconnection of each pipe 5 and the flow rate of fluid within the pipe 5 can be controlled by any means capable of switching the pipe 5 on or off; specifically, switches or various valves can be used. In one specific embodiment of the present invention, such as Figure 1 As shown, a low-pressure steam inlet valve 61 is installed on the inlet branch pipe 53, a water inlet valve 62 is installed on the inlet section 51 of the pipeline between the inlet branch pipe 53 and the deoxygenated water unit 2, a reflux valve 63 is installed on the loop branch pipe 54, and an outlet valve 64 is installed on the outlet section 52 of the pipeline between the loop branch pipe 54 and the steam separation unit 4, or on the outlet section 52 of the pipeline between the regeneration unit 3 and the steam separation unit 4. The low-pressure steam inlet valve 61 and the water inlet valve 62 can effectively control whether the low-pressure steam unit 1 or the deoxygenated water unit 2 is connected to the regeneration unit 3. The reflux valve 63 and the outlet valve 64 allow the liquid in the outlet section 52 of the pipeline to enter another inlet section 51 of the pipeline through the loop branch pipe 54.

[0073] In one specific embodiment of the present invention, such as Figure 1 As shown, a loop shut-off valve 65 is installed in the inlet section 51 of the pipeline between the inlet branch pipe 53 and the loop branch pipe 54. A regeneration inlet valve 66 is installed on the inlet section 51 of the pipeline between the loop branch pipe 54 and the regeneration unit 3, or on the inlet section 51 of the pipeline between the inlet branch pipe 53 and the regeneration unit 3. A regeneration outlet valve 67 is installed in the outlet section 52 of the pipeline between the loop branch pipe 54 and the regeneration unit 3. The loop shut-off valve 65 ensures that as much liquid as possible returning from the loop branch pipe 54 enters the series circuit, thereby further improving heat exchange efficiency. The regeneration inlet valve 66 and the regeneration outlet valve 67 can precisely control whether liquid enters or exits the regeneration unit 3. Moreover, the flow rate of fluid in the pipeline 5 can be controlled by the installation of each valve, thereby further improving the heat extraction range of the regeneration unit 3 and its adaptability to heat extraction requirements under different loads.

[0074] In a preferred embodiment of the present invention, the system further includes a room temperature gas supply unit, and the pipeline 5 also includes a room temperature gas branch pipe connected to the liquid inlet section 51 of the pipeline. The room temperature gas branch pipe is connected to the room temperature gas supply unit so that the gas from the room temperature gas supply unit can be supplied to the regeneration unit 3 through the room temperature gas branch pipe and the liquid inlet section 51 of the pipeline. The above design can further improve the heat extraction range of the regeneration unit 3, thereby further improving the adaptability of the regeneration unit 3 to the heat extraction requirements under different loads.

[0075] The inlet section 51 and outlet section 52 of the pipeline are respectively configured to be at least two. Specifically, the inlet section 51 can be configured to have two, three, four, five, six, seven, eight, etc., and the outlet section 52 can be configured to have two, three, four, five, six, seven, eight, etc. Preferably, the inlet section 51 and outlet section 52 of the pipeline are respectively configured to have four. Specifically, as shown in the figure... Figure 1 As shown, the inlet section 51 includes a first inlet section 51a, a second inlet section 51b, a third inlet section 51c, and a fourth inlet section 51d. The outlet section 52 includes a first outlet section 52a, a second outlet section 52b, a third outlet section 52c, and a fourth outlet section 52d. The circuit branch pipe 54 includes a first circuit branch pipe 54a connected between the first outlet section 52a and the second inlet section 51b, a second circuit branch pipe 54b connected between the second outlet section 52b and the third inlet section 51c, and a third circuit branch pipe 54c connected between the third outlet section 52c and the fourth inlet section 51d.

[0076] Four inlet sections 51 and four outlet sections 52 are provided in the pipeline, and three branch pipes 54 are provided in the loop. This can meet the heat extraction requirements of the regeneration unit 3 under different loads, thereby ensuring the operational flexibility of the system and reducing the equipment cost of the heat extraction system.

[0077] When the heat extraction system provided by the above-described embodiment is operating, when the heat extraction demand is greater than or equal to B% of the maximum heat extraction amount of the heat extraction system, the first pipeline formed by the connection of the first pipeline liquid inlet section 51a and the first pipeline liquid outlet section 52a, the second pipeline formed by the connection of the second pipeline liquid inlet section 51b and the second pipeline liquid outlet section 52b, the third pipeline formed by the connection of the third pipeline liquid inlet section 51c and the third pipeline liquid outlet section 52c, and the fourth pipeline formed by the connection of the fourth pipeline liquid inlet section 51d and the fourth pipeline liquid outlet section 52d are in parallel; when the heat extraction demand is greater than or equal to D% of the maximum heat extraction amount of the heat extraction system and less than B%, the first pipeline liquid outlet section 52a and the second pipeline liquid inlet section 51b are connected in series through the first loop branch pipe 54a, the third pipeline liquid outlet section 52c and the fourth pipeline liquid inlet section 51d are connected in series through the third loop branch pipe 54c, and the series pipeline formed by the connection of the first pipeline liquid inlet section 51a, a part of the first pipeline liquid outlet section 52a, the first loop branch pipe 54a, a part of the second pipeline liquid inlet section 51b, and the second pipeline liquid outlet section 52b is in parallel with the series pipeline formed by the connection of the third pipeline liquid inlet section 51c, a part of the third pipeline liquid outlet section 52c, the third loop branch pipe 54c, a part of the fourth pipeline liquid inlet section 51d, and the fourth pipeline liquid outlet section 52d; when the heat extraction demand is greater than or equal to A% of the maximum heat extraction amount of the heat extraction system and less than D%, the first pipeline liquid inlet section 51a, a part of the first pipeline liquid outlet section 52a, the first loop branch pipe 54a, a part of the second pipeline liquid inlet section 51b, a part of the second pipeline liquid outlet section 52b, the second loop branch pipe 54b, a part of the third pipeline liquid inlet section 51c, a part of the third pipeline liquid outlet section 52c, the third loop branch pipe 54c, a part of the fourth pipeline liquid inlet section 51d, and the fourth pipeline liquid outlet section 52d are connected in series.

[0078] Specifically, D, B, and A are all specific values, and their values can be determined by those skilled in the art according to the actual situation, and A < D < B. Exemplarily, A < D < B, A can be any value between 15 - 30, D can be any value between 30 - 50, and B can be any value between 55 - 80. As a specific embodiment of the present invention, A takes 20, D takes 40, and B takes 70.

[0079] As a specific embodiment of the present invention, as Figure 1 shown, the liquid inlet section branch pipe 53 includes a first liquid inlet section branch pipe 53a connected to the first pipeline liquid inlet section 51a, a second liquid inlet section branch pipe 53b connected to the second pipeline liquid inlet section 51b, a third liquid inlet section branch pipe 53c connected to the third pipeline liquid inlet section 51c, and a fourth liquid inlet section branch pipe 53d connected to the fourth pipeline liquid inlet section 51d.

[0080] The setting of the four liquid inlet section branch pipes 53 can further meet the heat extraction requirements of the regeneration unit 3 under different loads, thereby further increasing the operating flexibility of the system.

[0081] When the heat extraction system provided by the above-described embodiment is operating, when the heat extraction demand is greater than or equal to C% and less than A% of the maximum heat extraction amount of the heat extraction system, the first pipe formed by the connection of the first liquid inlet section branch pipe 53a and the first pipe liquid outlet section 52a, the second pipe formed by the connection of the second liquid inlet section branch pipe 53b and the second pipe liquid outlet section 52b, the third pipe formed by the connection of the third liquid inlet section branch pipe 53c and the third pipe liquid outlet section 52c, and the fourth pipe formed by the connection of the fourth liquid inlet section branch pipe 53d and the fourth pipe liquid outlet section 52d are in parallel; when the heat extraction demand is greater than E% and less than C% of the maximum heat extraction amount of the heat extraction system, the pipe 5 obtained by connecting in series the first liquid inlet section branch pipe 53a, a part of the first pipe liquid inlet section 51a, a part of the first pipe liquid outlet section 52a, the first loop branch pipe 54a, a part of the second pipe liquid inlet section 51b, and the second pipe liquid outlet section 52b is in parallel with the pipe 5 obtained by connecting in series the third liquid inlet section branch pipe 53c, a part of the third pipe liquid inlet section 51c, a part of the third pipe liquid outlet section 52c, the third loop branch pipe 54c, a part of the fourth pipe liquid inlet section 51d, and the fourth pipe liquid outlet section 52d; when the heat extraction demand is less than or equal to E% of the maximum heat extraction amount of the heat extraction system, the first liquid inlet section branch pipe 53a, a part of the first pipe liquid inlet section 51a, a part of the first pipe liquid outlet section 52a, the first loop branch pipe 54a, a part of the second pipe liquid inlet section 51b, a part of the second pipe liquid outlet section 52b, the second loop branch pipe 54b, a part of the third pipe liquid inlet section 51c, a part of the third pipe liquid outlet section 52c, the third loop branch pipe 54c, a part of the fourth pipe liquid inlet section 51d, and the fourth pipe liquid outlet section 52d are connected in series.

[0082] Specifically, C, E, and A are all specific values, and their values can be determined by those skilled in the art according to the actual situation, and E < C < A. Exemplarily, E < C < A, A can be any value between 15 - 30, C can be any value between 8 - 15, and E can be any value between 3 - 8. As a specific embodiment of the present invention, A is taken as 20, C is taken as 12, and E is taken as 5.

[0083] In a specific embodiment of the present invention, as Figure 1As shown, the first inlet branch pipe 53a, the second inlet branch pipe 53b, the third inlet branch pipe 53c, and the fourth inlet branch pipe 53d are respectively equipped with a first low-pressure steam inlet valve 61a, a second low-pressure steam inlet valve 61b, a third low-pressure steam inlet valve 61c, and a fourth low-pressure steam inlet valve 61d; the first inlet section 51a between the first inlet branch pipe 53a and the deoxygenated water unit 2 is equipped with a first water inlet valve 62a; the second inlet section 51b between the second inlet branch pipe 53b and the deoxygenated water unit 2 is equipped with a second water inlet valve 62b; the third inlet section 51c between the third inlet branch pipe 53c and the deoxygenated water unit 2 is equipped with a third water inlet valve 62c; the fourth inlet branch pipe 53d and the deoxygenated water unit 2 are respectively equipped with a first water inlet valve 62a; the second inlet section branch pipe 53b between the second inlet branch pipe 53b and the deoxygenated water unit 2 is equipped with a second water inlet valve 62b; the third inlet section branch pipe 53c between the third inlet branch pipe 53c and the deoxygenated water unit 2 is equipped with a third water inlet valve 62c; the fourth inlet branch pipe 53d and the deoxygenated water unit 2 are respectively equipped with a first water inlet valve 62a; the second inlet section branch pipe 53b between the second inlet branch pipe 53b and the deoxygenated water unit 2 are respectively equipped with a second water inlet valve 62b; the third inlet section branch pipe 53c between the third inlet branch pipe 53c and the deoxygenated water unit 2 are respectively equipped with a third water inlet valve 62c; the fourth inlet section branch pipe 53d and the deoxy A fourth inlet valve 62d is installed on the fourth pipeline inlet section 51d between oxygen water unit 2; a first return valve 63a, a second return valve 63b, and a third return valve 63c are respectively installed on the first loop branch pipe 54a, the second loop branch pipe 54b, and the third loop branch pipe 54c; a first outlet valve 64a is installed on the first pipeline outlet section 52a between the first loop branch pipe 54a and the steam separation unit 4; a second outlet valve 64b is installed on the second pipeline outlet section 52b between the second loop branch pipe 54b and the steam separation unit 4; a third outlet valve 64c is installed on the third pipeline outlet section 52c between the third loop branch pipe 54c and the steam separation unit 4; and a fourth outlet valve 64d is installed on the fourth pipeline outlet section 52d.

[0084] By setting the valves mentioned above, the difficulty of adjusting the series and parallel connections of pipelines can be easily improved, thereby reducing the operational difficulty of meeting the heat extraction requirements of regeneration unit 3 under different loads.

[0085] The heat extraction system provided in the above embodiments controls the connection between the low-pressure steam unit 1 and the regeneration unit 3 or the deoxygenated water unit 2 and the regeneration unit 3 by opening and closing the first low-pressure steam inlet valve 61a, the second low-pressure steam inlet valve 61b, the third low-pressure steam inlet valve 61c, the fourth low-pressure steam inlet valve 61d, the first water inlet valve 62a, the second water inlet valve 62b, the third water inlet valve 62c, and the fourth water inlet valve 62d. When it is necessary to connect the low-pressure steam unit 1 to the regeneration unit 3, at least one of the following valves is opened: the first low-pressure steam inlet valve 61a, the second low-pressure steam inlet valve 61b, the third low-pressure steam inlet valve 61c, and the fourth low-pressure steam inlet valve 61d; and all of the following valves are closed: the first water inlet valve 62a, the second water inlet valve 62b, the third water inlet valve 62c, and the fourth water inlet valve 62d. When it is necessary to connect the deoxygenated water unit 2 to the regeneration unit 3, at least one of the following valves is opened: the first water inlet valve 62a, the second water inlet valve 62b, the third water inlet valve 62c, and the fourth water inlet valve 62d; and all of the following valves are closed: the first low-pressure steam inlet valve 61a, the second low-pressure steam inlet valve 61b, the third low-pressure steam inlet valve 61c, and the fourth low-pressure steam inlet valve 61d. The series and parallel connection of the control pipelines for opening and closing the first low-pressure steam inlet valve 61a, the second low-pressure steam inlet valve 61b, the third low-pressure steam inlet valve 61c, the fourth low-pressure steam inlet valve 61d, the first water inlet valve 62a, the second water inlet valve 62b, the third water inlet valve 62c, the fourth water inlet valve 62d, the first reflux valve 63a, the second reflux valve 63b, the third reflux valve 63c, the first liquid outlet valve 64a, the second liquid outlet valve 64b, the third liquid outlet valve 64c, and the fourth liquid outlet valve 64d allows for the connection of the first pipeline inlet section 51a, the first pipeline outlet section 52a, the second pipeline inlet section 51b, and the second pipeline outlet section 52b in series. When only the first pipeline inlet section 51a, the first pipeline outlet section 52a, the second pipeline inlet section 51b, and the second pipeline outlet section 52b need to be connected in series, the first reflux valve 63a is opened, the first liquid outlet valve 64a is closed, the first low-pressure steam inlet valve 61a or the first water inlet valve 62a is opened, the second low-pressure steam inlet valve 61b and the second water inlet valve 62b are closed, and the second liquid outlet section 52b is closed. Valve 64b is open; when only the third pipeline inlet section 51c, the third pipeline outlet section 52c, the fourth pipeline inlet section 51d, and the fourth pipeline outlet section 52d need to be connected in series, the third reflux valve 63c is opened, the third outlet valve 64c is closed, the third low-pressure steam inlet valve 61c or the third water inlet valve 62c is opened, the fourth low-pressure steam inlet valve 61d and the fourth water inlet valve 62d are closed, and the fourth outlet valve 64d is opened; when the first pipeline inlet section 51a and the first pipeline outlet section 52a need to be connected in series, and the second pipeline inlet section 51b and the second pipeline outlet section 52b need to be connected in parallel, the first reflux valve 63a is closed, the first outlet valve 64a is opened, the first low-pressure steam inlet valve 61a or the first water inlet valve 62a is opened, the second low-pressure steam inlet valve 61b or the second water inlet valve 62b is opened, and the second outlet valve 64b is opened.

[0086] As one specific embodiment of the present invention, such as Figure 1 As shown, the second inlet section 51b between the second inlet branch pipe 53b and the first circuit branch pipe 54a is equipped with a first circuit shut-off valve 65a; the third inlet section 51c between the third inlet branch pipe 53c and the second circuit branch pipe 54b is equipped with a second circuit shut-off valve 65b; the fourth inlet section 51d between the fourth inlet branch pipe 53d and the third circuit branch pipe 54c is equipped with a third circuit shut-off valve 65c; a first regeneration inlet valve 66a is installed on the first inlet section 51a between the first inlet branch pipe 53a and the regeneration unit 3; and a first regeneration inlet valve 66a is installed on the second inlet section 51b between the first circuit branch pipe 54a and the regeneration unit 3. A second regeneration inlet valve 66b is installed on the third pipeline inlet section 51c between the second circuit branch pipe 54b and the regeneration unit 3, and a fourth regeneration inlet valve 66d is installed on the fourth pipeline inlet section 51d between the third circuit branch pipe 54c and the regeneration unit 3; a first regeneration outlet valve 67a is installed on the first pipeline outlet section 52a between the first circuit branch pipe 54a and the regeneration unit 3, a second regeneration outlet valve 67b is installed on the second pipeline outlet section 52b between the second circuit branch pipe 54b and the regeneration unit 3, and a third regeneration outlet valve 67c is installed on the third pipeline outlet section 52c between the third circuit branch pipe 54c and the regeneration unit 3.

[0087] By installing the aforementioned valves, the phenomena of liquid deviation, dry burning, and water hammer in pipe 5 can be further reduced, avoiding frequent leakage in pipe 5. Simultaneously, the flow rate of fluid in pipe 5 can be controlled, thereby further increasing the heat extraction range of regeneration unit 3 and thus improving its adaptability to heat extraction requirements under different loads.

[0088] The low-pressure steam unit 1 can be any device or structure capable of providing low-pressure steam; the deoxygenated water unit 2 can be any device or structure capable of supplying deoxygenated water; the regeneration unit 3 can be any device or structure capable of heat exchange; and the steam separation unit 4 can be any device or structure capable of gas-liquid separation. In a specific embodiment of the present invention, the low-pressure steam unit 1 is a 1.0 MPa low-pressure steam station, the pipeline 5 is a hot coil, the deoxygenated water unit 2 is a deoxygenated water station, the regeneration unit 3 is a regenerator, and the steam separation unit 4 is a steam separator.

[0089] In order to further precisely control the steam pressure at the outlet, in one specific embodiment of the present invention, a steam flow regulating valve is provided at the outlet of the steam separation unit 4.

[0090] In a basic embodiment of the present invention, a heat extraction method is provided, employing any of the heat extraction systems provided above, the method comprising:

[0091] When the heat demand is greater than or equal to A% of the maximum heat output of the heat system, the deoxygenated water unit 2, the regeneration unit 3 and the steam separation unit 4 are connected to inject the deoxygenated water in the deoxygenated water unit 2 into the steam separation unit 4 after passing through the regeneration unit 3. The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes 5 formed by at least two pipe inlet sections 51 and at least two pipe outlet sections 52 connected in series and the flow rate in the pipes 5.

[0092] When the heat demand is less than A% of the maximum heat output of the heat system, the low-pressure steam unit 1, the regeneration unit 3 and the steam separation unit 4 are connected to inject the low-pressure steam from the low-pressure steam unit 1 into the steam separation unit 4 after passing through the regeneration unit 3. The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes 5 formed by at least two pipe inlet sections 51, at least two pipe outlet sections 52 and at least two inlet section branch pipes 53, as well as the flow rate in the pipes 5.

[0093] Wherein, A is a definite numerical value, the value of which can be determined by those skilled in the art based on the actual situation. For example, it can be any value between 15 and 30, specifically 15, 16, 18, 20, 22, 24, 26, 28, 30, or any value between these values. As a specific embodiment of the present invention, A is 20.

[0094] The heat extraction method provided by the above basic embodiment simultaneously sets up a low-pressure steam unit 1 and a deoxygenated water unit 2, and controls the connection of the low-pressure steam unit 1 and the deoxygenated water unit 2 to the regeneration unit 3 through the setting of pipeline 5. At the same time, the liquid outlet section 52 of the pipeline and a liquid inlet section 51 of the pipeline that does not correspond to the liquid outlet section 52 are connected through a loop branch pipe 54. The connection of pipeline 5 in parallel or in series is controlled by whether the loop branch pipe 54 is open or closed, thereby adjusting the actual heat extraction by changing the flow rate of the fluid in the pipeline 5. This can further increase the heat extraction range of the regeneration unit 3, thereby further improving the adaptability of the regeneration unit 3 to the heat extraction requirements under different loads. Moreover, it is not necessary to limit the flow rate in the pipeline to a minimum value, which can prevent flow deviation, dry burning and water hammer in the pipeline 5 and avoid water pipe leakage.

[0095] As a specific embodiment of the present invention, when the heat demand is greater than or equal to B% of the maximum heat output of the heat extraction system, at least two pipe inlet sections 51 and at least two pipe outlet sections 52 are connected in series to form at least two pipes 5, and at least two pipes 5 are connected in parallel. The water supply of the deoxygenated water unit 2 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the pipe heat exchange section enters the steam separation unit 4.

[0096] When the heat extraction demand is greater than or equal to A% and less than B% of the maximum heat extraction capacity of the heat extraction system, at least two pipeline liquid inlet sections 51 and at least two pipeline liquid outlet sections 52 are correspondingly connected in series to form at least two pipelines 5. The pipelines 5 in the at least two pipelines 5 are connected in series in pairs to obtain a series pipeline. The series pipelines are connected in series or in parallel with each other or with the possible remaining pipelines 5. The water supply of the deaerated water unit 2 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4;

[0097] When the heat extraction demand is greater than or equal to C% and less than A% of the maximum heat extraction capacity of the heat extraction system, at least two pipeline liquid inlet sections 51, at least two pipeline liquid outlet sections 52 and at least two liquid inlet section branch pipes 53 are correspondingly connected in series to form at least two pipelines 5. The at least two pipelines 5 are connected in parallel. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4;

[0098] When the heat extraction demand is less than C% of the maximum heat extraction capacity of the heat extraction system, at least two pipeline liquid inlet sections 51, at least two pipeline liquid outlet sections 52 and at least two liquid inlet section branch pipes 53 are correspondingly connected in series to form at least two pipelines 5. The pipelines 5 in the at least two pipelines 5 are connected in series in pairs to obtain a series pipeline. The series pipelines are connected in series or in parallel with each other or with the possible remaining pipelines 5. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4. Adopting this method can further improve the adaptability to the heat extraction requirements of the regeneration unit 3 under different loads.

[0099] Specifically, like A and D, B is also a specific value, and its value can be determined by those skilled in the art according to the actual situation, and A < D < B. Exemplarily, A < D < B, A can be any value between 15 - 30, D can be any value between 30 - 50, and B can be any value between 55 - 80. As a specific embodiment of the present invention, A is taken as 20, D is taken as 40, and B is taken as 70.

[0100] More specifically, exemplarily, when there are two corresponding inlet sections 51, outlet sections 52, and inlet branch pipes 53, and the heat demand is greater than or equal to A% and less than B% of the maximum heat output of the heat extraction system, the two inlet sections 51 and the two outlet sections 52 are connected in series to form two pipes 5 connected in series; when there are two corresponding inlet sections 51, outlet sections 52, and inlet branch pipes 53, and the heat demand is less than C% of the maximum heat output of the heat extraction system, the two inlet sections 51, the two outlet sections 52, and the two inlet branch pipes 53 are connected in series to form two pipes 5 connected in series. When there are three corresponding inlet sections 51, outlet sections 52, and inlet branch pipes 53, and the heat demand is greater than or equal to A% and less than B% of the maximum heat output of the heat extraction system, two of the three pipes 5 formed by the three inlet sections 51 and the three outlet sections 52 are connected in series to form a series pipe, and the other pipe 5 is connected in series or in parallel with the series pipe; when there are three corresponding inlet sections 51, outlet sections 52, and inlet branch pipes 53, and the heat demand is less than C% of the maximum heat output of the heat extraction system, two of the three pipes 5 formed by the three inlet sections 51, the three outlet sections 52, and the three inlet branch pipes 53 are connected in series to form a series pipe, and the other pipe 5 is connected in series or in parallel with the series pipe.

[0101] In one specific embodiment of the present invention, the inlet section 51 includes a first inlet section 51a, a second inlet section 51b, a third inlet section 51c, and a fourth inlet section 51d; the outlet section 52 includes a first outlet section 52a, a second outlet section 52b, a third outlet section 52c, and a fourth outlet section 52d; and the return branch pipe 54 includes a first return branch pipe 54a connected between the first outlet section 52a and the second inlet section 51b, and a return branch pipe 54d connected between the second outlet section 51a and the second inlet section 51b. The second loop branch pipe 54b between 2b and the third pipeline inlet section 51c, and the third loop branch pipe 54c connected between the third pipeline outlet section 52c and the fourth pipeline inlet section 51d, the inlet section branch pipe 53 includes a first inlet section branch pipe 53a connected to the first pipeline inlet section 51a, a second inlet section branch pipe 53b connected to the second pipeline inlet section 51b, a third inlet section branch pipe 53c connected to the third pipeline inlet section 51c, and a fourth inlet section branch pipe 53d connected to the fourth pipeline inlet section 51d;

[0102] When the heat demand is greater than or equal to B% of the maximum heat capacity of the heat system, the first pipe formed by connecting the first pipe inlet section 51a and the first pipe outlet section 52a, the second pipe formed by connecting the second pipe inlet section 51b and the second pipe outlet section 52b, the third pipe formed by connecting the third pipe inlet section 51c and the third pipe outlet section 52c, and the fourth pipe formed by connecting the fourth pipe inlet section 51d and the fourth pipe outlet section 52d are connected in parallel. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the heat exchange section of the pipe enters the steam separation unit 4.

[0103] When the heat demand is greater than or equal to D% of the maximum heat capacity of the heat extraction system and less than B%, the first pipe outlet section 52a and the second pipe inlet section 51b are connected in series through the first loop branch pipe 54a, the third pipe outlet section 52c and the fourth pipe inlet section 51d are connected in series through the third loop branch pipe 54c, and the series pipe formed by connecting the first pipe inlet section 51a, part of the first pipe outlet section 52a, the first loop branch pipe 54a, part of the second pipe inlet section 51b and the second pipe outlet section 52b is connected in parallel with the series pipe formed by connecting the third pipe inlet section 51c, part of the third pipe outlet section 52c, the third loop branch pipe 54c, part of the fourth pipe inlet section 51d and the fourth pipe outlet section 52d. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the pipe heat exchange section enters the steam separation unit 4.

[0104] When the heat demand is greater than or equal to A% of the maximum heat capacity of the heat extraction system and less than D%, the first pipeline inlet section 51a, part of the first pipeline outlet section 52a, the first loop branch pipe 54a, part of the second pipeline inlet section 51b, part of the second pipeline outlet section 52b, the second loop branch pipe 54b, part of the third pipeline inlet section 51c, part of the third pipeline outlet section 52c, the third loop branch pipe 54c, part of the fourth pipeline inlet section 51d, and the fourth pipeline outlet section 52d are connected in series. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the pipeline heat exchange section enters the steam separation unit 4.

[0105] When the heat demand is greater than or equal to C% of the maximum heat capacity of the heat extraction system and less than A%, the first pipeline formed by connecting the first inlet section branch pipe 53a and the first pipeline outlet section 52a, the second pipeline formed by connecting the second inlet section branch pipe 53b and the second pipeline outlet section 52b, the third pipeline formed by connecting the third inlet section branch pipe 53c and the third pipeline outlet section 52c, and the fourth pipeline formed by connecting the fourth inlet section branch pipe 53d and the fourth pipeline outlet section 52d are connected in parallel. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the pipeline heat exchange section enters the steam separation unit 4.

[0106] When the heat demand is greater than E% and less than C% of the maximum heat capacity of the heat extraction system, the pipe 5 obtained by connecting the first inlet section branch pipe 53a, part of the first pipe inlet section 51a, part of the first pipe outlet section 52a, the first loop branch pipe 54a, part of the second pipe inlet section 51b, and the second pipe outlet section 52b in series, and the pipe 5 obtained by connecting the third inlet section branch pipe 53c, part of the third pipe inlet section 51c, part of the third pipe outlet section 52c, the third loop branch pipe 54c, part of the fourth pipe inlet section 51d, and the fourth pipe outlet section 52d in series, are connected in parallel. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the heat exchange section of the pipe enters the steam separation unit 4.

[0107] When the heat demand is less than or equal to E% of the maximum heat capacity of the heat extraction system, the first inlet section branch pipe 53a, part of the first pipeline inlet section 51a, part of the first pipeline outlet section 52a, the first loop branch pipe 54a, part of the second pipeline inlet section 51b, part of the second pipeline outlet section 52b, the second loop branch pipe 54b, part of the third pipeline inlet section 51c, part of the third pipeline outlet section 52c, the third loop branch pipe 54c, part of the fourth pipeline inlet section 51d, and the fourth pipeline outlet section 52d are connected in series. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3, and the steam generated in the pipeline heat exchange section enters the steam separation unit 4.

[0108] Specifically, A, B, C, D, and E are all specific numerical values, which can be determined by those skilled in the art based on actual circumstances. In one specific embodiment of the present invention, A is 20, D is 40, B is 70, C is 12, and E is 5.

[0109] Four inlet pipe sections 51 and four outlet pipe sections 52 are provided, along with three loop branch pipes 54. This arrangement further meets the heat extraction requirements of the regeneration unit 3 under different loads, thereby increasing the operational flexibility of the system. The four inlet pipe branch pipes 53 further meet the heat extraction requirements of the regeneration unit 3 under different loads, thus increasing the operational flexibility of the system.

[0110] In one specific embodiment of the present invention, a room temperature gas supply unit is included. Pipeline 5 further includes a room temperature gas branch pipe connected to the room temperature gas supply unit, enabling the supply of gas from the room temperature gas supply unit to the regeneration unit 3 via the branch pipe and the inlet section 51. When the heat demand is less than or equal to E% of the maximum heat capacity of the heat extraction system, the room temperature gas supply unit, regeneration unit 3, and steam separation unit 4 can be connected to inject gas from the room temperature gas supply unit into the steam separation unit 4 after passing through the regeneration unit 3. The actual heat capacity is adjusted by regulating the series-parallel connection of at least two pipes 5 (formed by at least two room temperature gas branch pipes, at least two inlet sections 51, and at least two outlet sections 52) and the flow rate within the pipes 5. This method further improves the adaptability of the regeneration unit 3 to heat extraction requirements under different loads.

[0111] Specifically, when the heat demand is large, at least two pipes 5 formed by connecting at least two ambient temperature gas branch pipes, at least two pipe inlet sections 51 and at least two pipe outlet sections 52 in series can be connected in parallel; when the heat demand is medium or small, at least two pipes 5 formed by connecting at least two ambient temperature gas branch pipes, at least two pipe inlet sections 51 and at least two pipe outlet sections 52 in series can be connected in series.

[0112] The heat extraction system and method provided by this invention can be used in any chemical process or other process that requires heat absorption. For example, the heat extraction system and method are used to cool the gasoline adsorption desulfurization unit in a gasoline adsorption desulfurization process.

[0113] In a relatively preferred embodiment of the present invention, a heat extraction system is provided, such as... Figure 1As shown, the system includes a low-pressure steam unit 1, a deoxygenated water unit 2, a regeneration unit 3, a steam separation unit 4, and a pipeline 5 connecting the low-pressure steam unit 1, the deoxygenated water unit 2, the regeneration unit 3, and the steam separation unit 4. The low-pressure steam unit 1 is a 1.0 MPa low-pressure steam station. The pipeline 5 is a hot coil. The deoxygenated water unit 2 is a deoxygenated water station. The regeneration unit 3 is a regenerator. The steam separation unit 4 is a steam separator. A steam flow regulating valve is installed at the outlet of the steam separator. The pipeline 5 includes a pipeline inlet section 51 connecting the deoxygenated water unit 2 and the regeneration unit 3, a pipeline outlet section 52 connecting the regeneration unit 3 and the steam separation unit 4, and inlet branch pipes 53 connected to each pipeline inlet section 51. 53 is connected to the low-pressure steam unit 1 to supply steam from the low-pressure steam unit 1 to the regeneration unit 3 via the inlet section branch pipe 53 and the pipeline inlet section 51. The pipeline inlet section 51 includes a first pipeline inlet section 51a, a second pipeline inlet section 51b, a third pipeline inlet section 51c, and a fourth pipeline inlet section 51d. The pipeline outlet section 52 includes a first pipeline outlet section 52a, a second pipeline outlet section 52b, a third pipeline outlet section 52c, and a fourth pipeline outlet section 52d. The loop branch pipe 54 includes a first loop branch pipe 54a connected between the first pipeline outlet section 52a and the second pipeline inlet section 51b, a second loop branch pipe 54b connected between the second pipeline outlet section 52b and the third pipeline inlet section 51c, and a connecting... A third loop branch pipe 54c is connected between the third pipeline outlet section 52c and the fourth pipeline inlet section 51d. The inlet section branch pipe 53 includes a first inlet section branch pipe 53a connected to the first pipeline inlet section 51a, a second inlet section branch pipe 53b connected to the second pipeline inlet section 51b, a third inlet section branch pipe 53c connected to the third pipeline inlet section 51c, and a fourth inlet section branch pipe 53d connected to the fourth pipeline inlet section 51d. A first low-pressure steam inlet valve 61a, a second low-pressure steam inlet valve 61b, a third low-pressure steam inlet valve 61c, and a fourth low-pressure steam inlet valve 53d are correspondingly installed on the first inlet section branch pipe 53a, the second inlet section branch pipe 53b, the third inlet section branch pipe 53c, and the fourth inlet section branch pipe 53d. Steam inlet valve 61d; a first water inlet valve 62a is installed on the first inlet section 51a between the first liquid inlet branch pipe 53a and the deoxygenated water unit 2, a second water inlet valve 62b is installed on the second inlet section 51b between the second liquid inlet branch pipe 53b and the deoxygenated water unit 2, a third water inlet valve 62c is installed on the third inlet section 51c between the third liquid inlet branch pipe 53c and the deoxygenated water unit 2, and a fourth water inlet valve 62d is installed on the fourth inlet section 51d between the fourth liquid inlet branch pipe 53d and the deoxygenated water unit 2; a first return valve 63a, a second return valve 63b, and a third return valve 63c are correspondingly installed on the first circuit branch pipe 54a, the second circuit branch pipe 54b, and the third circuit branch pipe 54c;A first outlet valve 64a is installed on the outlet section 52a of the first pipeline between the first loop branch pipe 54a and the steam separation unit 4; a second outlet valve 64b is installed on the outlet section 52b of the second pipeline between the second loop branch pipe 54b and the steam separation unit 4; a third outlet valve 64c is installed on the outlet section 52c of the third pipeline between the third loop branch pipe 54c and the steam separation unit 4; and a fourth outlet valve 64d is installed on the outlet section 52d of the fourth pipeline. A first loop shut-off valve 65a is installed on the inlet section 51b of the second pipeline between the second inlet branch pipe 53b and the first loop branch pipe 54a; a second loop shut-off valve 65b is installed on the inlet section 51c of the third pipeline between the third inlet branch pipe 53c and the second loop branch pipe 54b; and a third loop shut-off valve 65c is installed on the inlet section 51d of the fourth pipeline between the fourth inlet branch pipe 53d and the third loop branch pipe 54c. A first regeneration inlet valve 66a is installed on the first pipeline inlet section 51a between the liquid section branch pipe 53a and the regeneration unit 3; a second regeneration inlet valve 66b is installed on the second pipeline inlet section 51b between the first loop branch pipe 54a and the regeneration unit 3; a third regeneration inlet valve 66c is installed on the third pipeline inlet section 51c between the second loop branch pipe 54b and the regeneration unit 3; and a fourth regeneration inlet valve 66d is installed on the fourth pipeline inlet section 51d between the third loop branch pipe 54c and the regeneration unit 3. A first regeneration outlet valve 67a is installed on the first pipeline outlet section 52a between the first loop branch pipe 54a and the regeneration unit 3; a second regeneration outlet valve 67b is installed on the second pipeline outlet section 52b between the second loop branch pipe 54b and the regeneration unit 3; and a third regeneration outlet valve 67c is installed on the third pipeline outlet section 52c between the third loop branch pipe 54c and the regeneration unit 3.

[0114] When the heat extraction system provided in the above preferred embodiment is working:

[0115] When the heat demand is greater than or equal to 70% of the total heat demand, open the following valves: first inlet valve 62a, first outlet valve 64a, first regeneration inlet valve 66a, first regeneration outlet valve 67a, second inlet valve 62b, second outlet valve 64b, second regeneration inlet valve 66b, second regeneration outlet valve 67b, third inlet valve 62c, third outlet valve 64c, third regeneration inlet valve 66c, third regeneration outlet valve 67c, fourth inlet valve 62d, fourth outlet valve 64d, fourth regeneration inlet valve 66d, first loop shut-off valve 65a, second loop shut-off valve 65b, and third loop shut-off valve 65c; and close the following valves: first low-pressure steam inlet valve 61a, second low-pressure steam inlet valve 61b, and third low-pressure steam inlet valve 65c. Steam inlet valve 61c, fourth low-pressure steam inlet valve 61d, first reflux valve 63a, second reflux valve 63b, and third reflux valve 63c; so that the first pipeline formed by connecting the first pipeline inlet section 51a and the first pipeline outlet section 52a, the second pipeline formed by connecting the second pipeline inlet section 51b and the second pipeline outlet section 52b, the third pipeline formed by connecting the third pipeline inlet section 51c and the third pipeline outlet section 52c, and the fourth pipeline formed by connecting the fourth pipeline inlet section 51d and the fourth pipeline outlet section 52d are connected in parallel. The water supply of the deoxygenated water unit 2 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4, producing low-pressure steam of about 0.35MPa.

[0116] When the heat demand is greater than or equal to 40% but less than 70% of the total heat demand, open the following valves: first inlet valve 62a, first regeneration inlet valve 66a, first regeneration outlet valve 67a, first reflux valve 63a, second regeneration inlet valve 66b, second regeneration outlet valve 67b, second outlet valve 64b, third inlet valve 62c, second loop shut-off valve 65b, third regeneration inlet valve 66c, third regeneration outlet valve 67c, third reflux valve 63c, fourth regeneration inlet valve 66d, and fourth outlet valve 64d; close the following valves: first outlet valve 64a, second inlet valve 62b, third outlet valve 64c, fourth inlet valve 62f, first loop shut-off valve 65a, third loop shut-off valve 65c, first low-pressure steam inlet valve 61a, second low-pressure steam inlet valve 61b, third low-pressure steam inlet valve 61c, and fourth low-pressure steam inlet valve 61d. The second reflux valve 63b allows the first pipeline outlet section 52a and the second pipeline inlet section 51b to be connected in series via the first loop branch pipe 54a, and the third pipeline outlet section 52c and the fourth pipeline inlet section 51d to be connected in series via the third loop branch pipe 54c. The series pipeline formed by connecting the first pipeline inlet section 51a, part of the first pipeline outlet section 52a, the first loop branch pipe 54a, part of the second pipeline inlet section 51b and the second pipeline outlet section 52b is connected in parallel with the series pipeline formed by connecting the third pipeline inlet section 51c, part of the third pipeline outlet section 52c, the third loop branch pipe 54c, part of the fourth pipeline inlet section 51d and the fourth pipeline outlet section 52d. The water supply of the deoxygenated water unit 2 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4, producing low-pressure steam of about 0.35MPa.

[0117] When the heat demand is greater than or equal to 20% but less than 40% of the total heat demand, open the first inlet valve 62a, the first regeneration inlet valve 66a, the first regeneration outlet valve 67a, the first reflux valve 63a, the second regeneration inlet valve 66b, the second regeneration outlet valve 67b, the second reflux valve 63b, the third regeneration inlet valve 66c, the third regeneration outlet valve 67c, the third reflux valve 63c, the fourth regeneration inlet valve 66d, and the fourth outlet valve 64d; close the first outlet valve 64a, the second inlet valve 62b, the second outlet valve 64b, the third inlet valve 62c, the third outlet valve 64c, the fourth inlet valve 62f, the first loop shut-off valve 65a, the second loop shut-off valve 65b, the third loop shut-off valve 65c, and the first low-pressure steam valve. The following components are connected in series: inlet valve 61a, second low-pressure steam inlet valve 61b, third low-pressure steam inlet valve 61c, and fourth low-pressure steam inlet valve 61d; part of the first pipeline inlet section 51a, part of the first pipeline outlet section 52a, first loop branch pipe 54a, part of the second pipeline inlet section 51b, part of the second pipeline outlet section 52b, second loop branch pipe 54b, part of the third pipeline inlet section 51c, part of the third pipeline outlet section 52c, third loop branch pipe 54c, part of the fourth pipeline inlet section 51d, and fourth pipeline outlet section 52d. The water supply of the deoxygenated water unit 2 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4, producing low-pressure steam of about 0.35MPa.

[0118] When the heat demand is greater than or equal to 12% but less than 20% of the total heat demand, open the first low-pressure steam inlet valve 61a, the first liquid outlet valve 64a, the first regeneration inlet valve 66a, the first regeneration liquid outlet valve 67a, the second low-pressure steam inlet valve 61b, the second liquid outlet valve 64b, the second regeneration inlet valve 66b, the second regeneration liquid outlet valve 67b, the third low-pressure steam inlet valve 61c, the third liquid outlet valve 64c, the third regeneration inlet valve 66c, the third regeneration liquid outlet valve 67c, the fourth low-pressure steam inlet valve 61d, the fourth liquid outlet valve 64d, the fourth regeneration inlet valve 66d, the first circuit shut-off valve 65a, the second circuit shut-off valve 65b, and the third circuit shut-off valve 65c, and close the first water inlet valve 62a, the second... Water inlet valve 62b, third water inlet valve 62c, fourth water inlet valve 62d, first return valve 63a, second return valve 63b, and third return valve 63c are connected in parallel to form a first pipeline formed by connecting the first liquid inlet section branch pipe 53a and the first pipeline outlet section 52a, a second pipeline formed by connecting the second liquid inlet section branch pipe 53b and the second pipeline outlet section 52b, a third pipeline formed by connecting the third liquid inlet section branch pipe 53c and the third pipeline outlet section 52c, and a fourth pipeline formed by connecting the fourth liquid inlet section branch pipe 53d and the fourth pipeline outlet section 52d. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4 to produce low-pressure steam of about 0.35MPa.

[0119] When the heat demand exceeds 5% but is less than 12% of the maximum heat capacity of the heat extraction system, open the following valves: first low-pressure steam inlet valve 61a, first regeneration inlet valve 66a, first regeneration outlet valve 67a, first reflux valve 63a, second regeneration inlet valve 66b, second regeneration outlet valve 67b, second outlet valve 64b, third low-pressure steam inlet valve 61c, third regeneration inlet valve 66c, third regeneration outlet valve 67c, third reflux valve 63c, fourth regeneration inlet valve 66d, and fourth outlet valve 64d; and close the following valves: first outlet valve 64a, second water inlet valve 62b, second reflux valve 63b, third water inlet valve 62c, third outlet valve 64c, fourth water inlet valve 62f, first loop shut-off valve 65a, second loop shut-off valve 65b, third loop shut-off valve 65c, and first water inlet valve. 62a, the second low-pressure steam inlet valve 61b, and the fourth low-pressure steam inlet valve 61d; so that the pipe 5 obtained by connecting the first inlet section branch pipe 53a, part of the first pipeline inlet section 51a, part of the first pipeline outlet section 52a, the first loop branch pipe 54a, part of the second pipeline inlet section 51b, and the second pipeline outlet section 52b in series, and the pipe 5 obtained by connecting the third inlet section branch pipe 53c, part of the third pipeline inlet section 51c, part of the third pipeline outlet section 52c, the third loop branch pipe 54c, part of the fourth pipeline inlet section 51d, and the fourth pipeline outlet section 52d in series, are connected in parallel. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4, producing low-pressure steam of about 0.35MPa.

[0120] When the heat demand is less than or equal to 5% of the total heat demand, open the first low-pressure steam inlet valve 61a, the first regeneration inlet valve 66a, the first regeneration outlet valve 67a, the first reflux valve 63a, the second regeneration inlet valve 66b, the second regeneration outlet valve 67b, the second reflux valve 63b, the third regeneration inlet valve 66c, the third regeneration outlet valve 67c, the third reflux valve 63c, the fourth regeneration inlet valve 66d, and the fourth outlet valve 64d; close the first outlet valve 64a, the second water inlet valve 62b, the second outlet valve 64b, the third water inlet valve 62c, the third outlet valve 64c, the fourth water inlet valve 62f, the first circuit shut-off valve 65a, the second circuit shut-off valve 65b, the third circuit shut-off valve 65c, the first water inlet valve 62a, and the second low-pressure steam inlet valve 64d. The air inlet valve 61b, the third low-pressure steam inlet valve 61c, and the fourth low-pressure steam inlet valve 61d connect the first inlet section branch pipe 53a, a portion of the first pipeline inlet section 51a, a portion of the first pipeline outlet section 52a, the first loop branch pipe 54a, a portion of the second pipeline inlet section 51b, a portion of the second pipeline outlet section 52b, the second loop branch pipe 54b, a portion of the third pipeline inlet section 51c, a portion of the third pipeline outlet section 52c, the third loop branch pipe 54c, a portion of the fourth pipeline inlet section 51d, and the fourth pipeline outlet section 52d in series. The steam supply of the low-pressure steam unit 1 is adjusted according to the temperature control requirements of the regeneration unit 3. The steam generated in the pipeline heat exchange section enters the steam separation unit 4, producing low-pressure steam of about 0.35MPa.

[0121] The heat extraction system provided in the above-described preferred embodiment utilizes several coils within the regenerator and an outlet steam separator. The coil inlets can be selectively connected to deoxygenated water or 1.0 MPa steam as the heat extraction medium. Valves on the coils allow for series and parallel connection, enabling the selection of the required heat extraction medium, the amount of heat extraction medium consumed, and the series / parallel connection of the heat extraction coils based on the regenerator temperature. By switching between series and parallel connections of the coils, the flow rate of the heat extraction medium within the coils is increased, preventing dry burning or water hammer in the pipelines, ensuring the regenerator reaches the required temperature, and without increasing energy consumption. This further increases the heat extraction range of the regeneration unit, thereby improving its adaptability to heat extraction requirements under different loads. Simultaneously, the lower limit of heat extraction can be reduced to 1 / 4-1 / 6 of existing systems, and it can prevent flow deviation, dry burning, and water hammer at five points in the pipeline, avoiding water pipe leaks.

[0122] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0123] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0124] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A heat extraction system, characterized in that, It includes a low-pressure steam unit (1), a deoxygenated water unit (2), a regeneration unit (3), a steam separation unit (4), and a pipeline (5) that connects the low-pressure steam unit (1), the deoxygenated water unit (2), the regeneration unit (3), and the steam separation unit (4); The pipeline (5) includes at least two inlet sections (51) connected between the deoxygenated water unit (2) and the regeneration unit (3), at least two outlet sections (52) connected between the regeneration unit (3) and the steam distribution unit (4), and inlet branch pipes (53) connected to each inlet section (51). The inlet sections (51) and outlet sections (52) are arranged in a one-to-one correspondence. The inlet branch pipes (53) are connected to the low-pressure steam unit (1) so that the steam of the low-pressure steam unit (1) can be supplied to the regeneration unit (3) through the inlet branch pipes (53) and the inlet sections (51). The outlet section (52) and an inlet section (51) that does not correspond to the outlet section (52) can be connected through a loop branch pipe (54) so ​​that at least two outlet sections (52) and at least two inlet sections (51) can be connected in series.

2. The heat extraction system according to claim 1, characterized in that, A low-pressure steam inlet valve (61) is provided on the inlet branch pipe (53), a water inlet valve (62) is provided on the inlet section (51) of the pipeline between the inlet branch pipe (53) and the deoxygenated water unit (2), a return valve (63) is provided on the loop branch pipe (54), and an outlet valve (64) is provided on the outlet section (52) of the pipeline between the loop branch pipe (54) and the steam separation unit (4) or on the outlet section (52) of the pipeline between the regeneration unit (3) and the steam separation unit (4).

3. The heat extraction system according to claim 2, characterized in that, A loop shut-off valve (65) is provided in the inlet section (51) of the pipeline between the inlet section branch pipe (53) and the loop branch pipe (54). A regeneration inlet valve (66) is provided on the inlet section (51) of the pipeline between the loop branch pipe (54) and the regeneration unit (3) or on the inlet section (51) of the pipeline between the inlet section branch pipe (53) and the regeneration unit (3). A regeneration outlet valve (67) is provided in the outlet section (52) of the pipeline between the loop branch pipe (54) and the regeneration unit (3).

4. The heat extraction system according to any one of claims 1-3, characterized in that, It also includes a room temperature gas supply unit. The pipeline (5) also includes a room temperature gas branch pipe connected to the pipeline inlet section (51). The room temperature gas branch pipe is connected to the room temperature gas supply unit so that the gas from the room temperature gas supply unit can be supplied to the regeneration unit (3) through the room temperature gas branch pipe and the pipeline inlet section (51).

5. The heat extraction system according to any one of claims 1-3, characterized in that, The inlet section (51) of the pipeline includes a first inlet section (51a), a second inlet section (51b), a third inlet section (51c), and a fourth inlet section (51d). The outlet section (52) of the pipeline includes a first outlet section (52a), a second outlet section (52b), a third outlet section (52c), and a fourth outlet section (52d). The loop branch pipe (54) includes a first loop branch pipe (54a) connected between the first outlet section (52a) and the second inlet section (51b), a second loop branch pipe (54b) connected between the second outlet section (52b) and the third inlet section (51c), and a third loop branch pipe (54c) connected between the third outlet section (52c) and the fourth inlet section (51d).

6. The heat extraction system according to claim 5, characterized in that, The inlet section branch pipe (53) includes a first inlet section branch pipe (53a) connected to the first pipeline inlet section (51a), a second inlet section branch pipe (53b) connected to the second pipeline inlet section (51b), a third inlet section branch pipe (53c) connected to the third pipeline inlet section (51c), and a fourth inlet section branch pipe (53d) connected to the fourth pipeline inlet section (51d). The first liquid inlet section branch pipe (53a), the second liquid inlet section branch pipe (53b), the third liquid inlet section branch pipe (53c), and the fourth liquid inlet section branch pipe (53d) are respectively provided with a first low-pressure steam inlet valve (61a), a second low-pressure steam inlet valve (61b), a third low-pressure steam inlet valve (61c), and a fourth low-pressure steam inlet valve (61d); A first inlet valve (62a) is provided on the first inlet section (51a) between the first inlet section branch pipe (53a) and the deoxygenated water unit (2); a second inlet valve (62b) is provided on the second inlet section (51b) between the second inlet section branch pipe (53b) and the deoxygenated water unit (2); a third inlet valve (62c) is provided on the third inlet section (51c) between the third inlet section branch pipe (53c) and the deoxygenated water unit (2); and a fourth inlet valve (62d) is provided on the fourth inlet section (51d) between the fourth inlet section branch pipe (53d) and the deoxygenated water unit (2). The first circuit branch pipe (54a), the second circuit branch pipe (54b), and the third circuit branch pipe (54c) are respectively provided with a first return valve (63a), a second return valve (63b), and a third return valve (63c); A first outlet valve (64a) is provided on the first pipeline outlet section (52a) between the first circuit branch pipe (54a) and the steam separation unit (4), a second outlet valve (64b) is provided on the second pipeline outlet section (52b) between the second circuit branch pipe (54b) and the steam separation unit (4), a third outlet valve (64c) is provided on the third pipeline outlet section (52c) between the third circuit branch pipe (54c) and the steam separation unit (4), and a fourth outlet valve (64d) is provided on the fourth pipeline outlet section (52d).

7. The heat extraction system according to claim 6, characterized in that, A first circuit shut-off valve (65a) is provided in the second pipeline inlet section (51b) between the second inlet section branch pipe (53b) and the first circuit branch pipe (54a); a second circuit shut-off valve (65b) is provided in the third pipeline inlet section (51c) between the third inlet section branch pipe (53c) and the second circuit branch pipe (54b); and a third circuit shut-off valve (65c) is provided in the fourth pipeline inlet section (51d) between the fourth inlet section branch pipe (53d) and the third circuit branch pipe (54c). A first regeneration inlet valve (66a) is provided on the first pipeline inlet section (51a) between the first inlet section branch pipe (53a) and the regeneration unit (3); a second regeneration inlet valve (66b) is provided on the second pipeline inlet section (51b) between the first loop branch pipe (54a) and the regeneration unit (3); a third regeneration inlet valve (66c) is provided on the third pipeline inlet section (51c) between the second loop branch pipe (54b) and the regeneration unit (3); and a fourth regeneration inlet valve (66d) is provided on the fourth pipeline inlet section (51d) between the third loop branch pipe (54c) and the regeneration unit (3). A first regeneration outlet valve (67a) is provided in the first pipeline outlet section (52a) between the first circuit branch pipe (54a) and the regeneration unit (3), a second regeneration outlet valve (67b) is provided in the second pipeline outlet section (52b) between the second circuit branch pipe (54b) and the regeneration unit (3), and a third regeneration outlet valve (67c) is provided in the third pipeline outlet section (52c) between the third circuit branch pipe (54c) and the regeneration unit (3).

8. A method for heat extraction, characterized in that, The method using the heat extraction system according to any one of claims 1-7 includes: When the heat demand is greater than or equal to A% of the maximum heat output of the heat system, the deoxygenated water unit (2), the regeneration unit (3) and the steam separation unit (4) are connected to inject the deoxygenated water in the deoxygenated water unit (2) into the steam separation unit (4) after passing through the regeneration unit (3). The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes (5) formed by at least two pipe inlet sections (51) and at least two pipe outlet sections (52) connected in series and the flow rate in the pipes (5). When the heat demand is less than A% of the maximum heat output of the heat system, the low-pressure steam unit (1), the regeneration unit (3) and the steam separation unit (4) are connected to inject the low-pressure steam of the low-pressure steam unit (1) into the steam separation unit (4) after passing through the regeneration unit (3). The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes (5) formed by at least two pipe inlet sections (51), at least two pipe outlet sections (52) and at least two inlet section branch pipes (53) and the flow rate in the pipes (5).

9. The heat extraction method according to claim 8, characterized in that, When the heat demand is greater than or equal to B% of the maximum heat capacity of the heat system, at least two inlet pipe sections (51) and at least two outlet pipe sections (52) are connected in series to form at least two pipes (5), and at least two of the pipes (5) are connected in parallel. When the heat demand is greater than or equal to A% of the maximum heat capacity of the heat system and less than B%, at least two inlet pipe sections (51) and at least two outlet pipe sections (52) are connected in series to form at least two pipes (5). The pipes (5) in the at least two pipes (5) are connected in series to form a series pipe. The series pipes are connected in series or in parallel with each other or with any remaining pipes (5). When the heat demand is greater than or equal to C% of the maximum heat capacity of the heat system and less than A%, at least two inlet pipe sections (51), at least two outlet pipe sections (52) and at least two inlet pipe branch pipes (53) are connected in series to form at least two pipes (5), and at least two of the pipes (5) are connected in parallel. When the heat demand is less than C% of the maximum heat capacity of the heat extraction system, at least two inlet pipe sections (51), at least two outlet pipe sections (52), and at least two inlet pipe branch pipes (53) are connected in series to form at least two pipes (5). The pipes (5) in the at least two pipes (5) are connected in series to form a series pipe. The series pipes are connected in series or in parallel with each other or with any remaining pipes (5).

10. The heat extraction method according to claim 9, characterized in that, The inlet section (51) of the pipeline includes a first inlet section (51a), a second inlet section (51b), a third inlet section (51c), and a fourth inlet section (51d). The outlet section (52) of the pipeline includes a first outlet section (52a), a second outlet section (52b), a third outlet section (52c), and a fourth outlet section (52d). The return branch pipe (54) includes a first return branch pipe (54a) connected between the first outlet section (52a) and the second inlet section (51b), and a return branch pipe (54a) connected between the second outlet section (52b) and the third inlet section (51d). The second loop branch pipe (54b) between the first inlet section (51c) and the third loop branch pipe (54c) connecting the third outlet section (52c) and the fourth inlet section (51d) of the pipeline, the inlet section branch pipe (53) includes a first inlet section branch pipe (53a) connected to the first inlet section (51a), a second inlet section branch pipe (53b) connected to the second inlet section (51b), a third inlet section branch pipe (53c) connected to the third inlet section (51c) of the pipeline, and a fourth inlet section branch pipe (53d) connected to the fourth inlet section (51d); When the heat demand is greater than or equal to B% of the maximum heat capacity of the heat extraction system, the first pipe formed by connecting the first pipe inlet section (51a) and the first pipe outlet section (52a), the second pipe formed by connecting the second pipe inlet section (51b) and the second pipe outlet section (52b), the third pipe formed by connecting the third pipe inlet section (51c) and the third pipe outlet section (52c), and the fourth pipe formed by connecting the fourth pipe inlet section (51d) and the fourth pipe outlet section (52d) are connected in parallel. When the heat demand is greater than or equal to D% of the maximum heat output of the heat extraction system and less than B%, the first pipe outlet section (52a) and the second pipe inlet section (51b) are connected in series through the first loop branch pipe (54a), the third pipe outlet section (52c) and the fourth pipe inlet section (51d) are connected in series through the third loop branch pipe (54c), and the series pipe formed by connecting the first pipe inlet section (51a), part of the first pipe outlet section (52a), the first loop branch pipe (54a), part of the second pipe inlet section (51b) and the second pipe outlet section (52b) is connected in parallel with the series pipe formed by connecting the third pipe inlet section (51c), part of the third pipe outlet section (52c), the third loop branch pipe (54c), part of the fourth pipe inlet section (51d) and the fourth pipe outlet section (52d). When the heat demand is greater than or equal to A% and less than D% of the maximum heat output of the heat extraction system, the first pipe inlet section (51a), a portion of the first pipe outlet section (52a), the first loop branch pipe (54a), a portion of the second pipe inlet section (51b), a portion of the second pipe outlet section (52b), the second loop branch pipe (54b), a portion of the third pipe inlet section (51c), a portion of the third pipe outlet section (52c), the third loop branch pipe (54c), a portion of the fourth pipe inlet section (51d), and the fourth pipe outlet section (52d) are connected in series; When the heat demand is greater than or equal to C% of the maximum heat capacity of the heat extraction system and less than A%, the first pipe formed by connecting the first inlet section branch pipe (53a) and the first pipe outlet section (52a), the second pipe formed by connecting the second inlet section branch pipe (53b) and the second pipe outlet section (52b), the third pipe formed by connecting the third inlet section branch pipe (53c) and the third pipe outlet section (52c), and the fourth pipe formed by connecting the fourth inlet section branch pipe (53d) and the fourth pipe outlet section (52d) are connected in parallel. When the heat demand is greater than E% and less than C% of the maximum heat capacity of the heat extraction system, the pipe (5) obtained by connecting the first inlet section branch pipe (53a), part of the first pipe inlet section (51a), part of the first pipe outlet section (52a), the first loop branch pipe (54a), part of the second pipe inlet section (51b), and the second pipe outlet section (52b) in series, and the pipe (5) obtained by connecting the third inlet section branch pipe (53c), part of the third pipe inlet section (51c), part of the third pipe outlet section (52c), the third loop branch pipe (54c), part of the fourth pipe inlet section (51d), and the fourth pipe outlet section (52d) in series, are connected in parallel. When the heat demand is less than or equal to E% of the maximum heat capacity of the heat extraction system, the first inlet section branch pipe (53a), a portion of the first pipe inlet section (51a), a portion of the first pipe outlet section (52a), the first loop branch pipe (54a), a portion of the second pipe inlet section (51b), a portion of the second pipe outlet section (52b), the second loop branch pipe (54b), a portion of the third pipe inlet section (51c), a portion of the third pipe outlet section (52c), the third loop branch pipe (54c), a portion of the fourth pipe inlet section (51d), and the fourth pipe outlet section (52d) are connected in series.

11. The heat extraction method according to any one of claims 8-10, characterized in that, The pipeline (5) includes a room temperature gas supply unit and a room temperature gas branch pipe. The room temperature gas branch pipe is connected to the room temperature gas supply unit so that the gas from the room temperature gas supply unit can be supplied to the regeneration unit (3) through the room temperature gas branch pipe and the liquid inlet section (51) of the pipeline. When the heat demand is less than or equal to E% of the maximum heat output of the heat system, the ambient temperature gas supply unit, the regeneration unit (3) and the steam separation unit (4) are connected to inject the gas in the ambient temperature gas supply unit into the steam separation unit (4) after passing through the regeneration unit (3). The actual heat output is adjusted by regulating the series and parallel connection of at least two pipes (5) formed by at least two ambient temperature gas branch pipes, at least two pipe inlet sections (51) and at least two pipe outlet sections (52) and the flow rate in the pipes (5).

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