A heat system and a control method of a heat system

Abstract

A kind of heat system and the control method of heat system.The heat system includes compression subsystem and gas boiler, compression subsystem includes compressor unit and adjustment bypass, the inlet end of compressor unit is communicated with gas pipeline, adjustment bypass is connected with the outlet end of compressor unit;Gas boiler is communicated with adjustment bypass, gas is converted into high-temperature high-pressure gas by compressor unit, adjustment bypass is used to control the state of compressor unit, adjustment bypass is communicated with the outlet end of compressor unit and gas boiler, at least part of high-temperature high-pressure gas that enters adjustment bypass by compressor unit will enter gas boiler and burn, enhance the recycling ability of heat system to gas waste heat, improve the energy utilization rate of heat system.

Description

Technical Field

[0001] This application relates to the field of thermal power technology, and in particular to a thermal system and a control method for the thermal system. Background Technology

[0002] Gas-steam combined cycle generator sets, as an advanced power generation technology, are gaining increasing attention and development in the international power industry due to their advantages such as high efficiency and low energy consumption, rapid start-up, flexible regulation, high availability, low investment, short construction period, and low environmental pollution. They are particularly widely used in the natural gas and metallurgical industries.

[0003] However, the gas-steam combined cycle generator sets currently on the market do not make good use of the waste heat of the units, resulting in low energy utilization rates. Summary of the Invention

[0004] In view of the above problems, this application provides a thermal system and a control method for the thermal system to improve the problems of waste heat and low energy utilization rate of the thermal system.

[0005] In a first aspect, this application provides a thermal system including a compression subsystem and a gas boiler. The compression subsystem includes a compressor unit and a regulating bypass. The inlet end of the compressor unit is connected to a gas pipeline, and the regulating bypass is connected to the outlet end of the compressor unit. The gas boiler is connected to the regulating bypass so that the gas from the regulating bypass can enter the gas boiler.

[0006] In some embodiments, the regulating bypass includes: a first bypass and a first valve group. The first bypass is connected between the compressor outlet and the gas boiler, and the first bypass is used to regulate the surge degree of the compressor unit. The first valve group is disposed on the first bypass and is used to control the gas flow rate in the first bypass.

[0007] In some embodiments, a control valve group is provided on the first bypass, and the control valve group is located between the first valve group and the gas boiler.

[0008] In some embodiments, the regulating bypass further includes a second bypass and a second valve group. The second bypass is connected between the compressor outlet and the gas boiler and is used to regulate the compressor load. The second valve group is disposed on the second bypass and is used to control the gas flow rate in the second bypass.

[0009] In some embodiments, the regulating bypass further includes a third bypass, a third valve group, a fourth bypass, and a fourth valve group. The third bypass is connected between the outlet end and the inlet end of the compressor unit and is used to regulate the load of the compressor unit. The fourth bypass is connected between the outlet end and the inlet end of the compressor unit and is used to control the backflow of the compressor unit. The third valve group is disposed on the third bypass and is used to control the gas flow rate within the third bypass. The fourth valve group is disposed on the fourth bypass and is used to control the gas flow rate within the fourth bypass.

[0010] In some embodiments, the regulating bypass includes a cooling device disposed on a third bypass to cool the gas flowing from the third bypass to the compressor unit inlet, and / or disposed on a fourth bypass to cool the gas flowing from the fourth bypass to the compressor unit inlet.

[0011] In some embodiments, the thermal system further includes an air compressor unit and a gas turbine, wherein the air compressor unit is used to compress air; the gas turbine is connected to a generator set, and the inlet end of the gas turbine is connected to the air compressor unit and the compressor unit.

[0012] Secondly, this application provides a control method for a thermal system, used to control the thermal system described in the first aspect. The control method includes a start-up phase and an operation phase. In the start-up phase, the compressor unit starts up, and the gas enters the compressor unit and enters the gas boiler through a regulating bypass. In the operation phase, the compressor unit operates at its rated load.

[0013] In some embodiments, the thermal system includes a first bypass connected between the compressor outlet and the gas boiler, the first bypass being provided with a first valve group, and the operation phase includes: the opening degree of the first valve group being maintained from 12% to 17%.

[0014] In some embodiments, the thermal system includes a third bypass connected between the outlet end and the inlet end of the compressor unit, the third bypass being used to regulate the load on the compressor unit; a fourth bypass connected between the outlet end and the inlet end of the compressor unit, the fourth bypass being used to control the backflow condition of the compressor unit; a cooling device is provided on the third bypass and / or the fourth bypass, and the start-up phase includes: starting the cooling device to cool the gas flowing from the third bypass and / or the fourth bypass to the inlet end of the compressor unit.

[0015] In the technical solution of this application embodiment, the thermal system includes a compression subsystem and a gas boiler. The compression subsystem includes a compressor unit and a regulating bypass. The gas is converted into high-temperature and high-pressure gas through the compressor unit. The regulating bypass is used to control the state of the compressor unit. The regulating bypass is connected to the outlet end of the compressor unit and the gas boiler. At least part of the high-temperature and high-pressure gas that enters the regulating bypass from the compressor unit will enter the gas boiler for combustion, which enhances the thermal system's ability to recover and utilize waste heat from the gas and improves the energy utilization rate of the thermal system. Attached Figure Description

[0016] The invention can be better understood from the following description of specific embodiments of the invention in conjunction with the accompanying drawings, wherein:

[0017] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

[0018] Figure 1 Schematic diagrams of thermal systems provided for some embodiments of this application;

[0019] Figure 2 For this application Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 Schematic diagrams of thermal systems provided for other embodiments of this application;

[0021] Figure 4 For this application Figure 3 Enlarged view of point B in the middle;

[0022] Figure 5 A flowchart of a thermal system control method provided for some embodiments of this application.

[0023] The reference numerals in the detailed embodiments are as follows:

[0024] 1 Thermal system, 2 Compression subsystem, 11 Compressor unit, 12 Gas boiler, 13 Regulating bypass, 14 Cooling device, 15 Air compressor, 16 Gas turbine, 17 Generator unit, 18 Control valve group, 131a First bypass, 131b First valve group, 132a Second bypass, 132b Second valve group, 133a Third bypass, 133b Third valve group, 134a Fourth bypass, 134b Fourth valve group. Detailed Implementation

[0025] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0027] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and 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 limitations on the embodiments of this application.

[0028] Furthermore, technical terms such as "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 technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] Gas-steam combined cycle generator sets, as an advanced power generation technology, are gaining increasing attention and development in the international power industry due to their advantages such as high efficiency and low energy consumption, rapid start-up, flexible regulation, high availability, low investment, short construction period, and low environmental pollution. They are particularly widely used in the natural gas and metallurgical industries.

[0032] A generator set with a gas turbine and a steam turbine as the main unit generates electricity by burning gaseous fuel with certain parameters in the gas turbine. The flue gas produced generates power, and the exhaust gas carries the remaining heat into a waste heat boiler to heat the medium water into steam. The high-parameter steam enters the steam turbine, which is equipped with a condenser. The exhaust steam of the steam turbine is cooled by cooling water to create a negative pressure, which enables the steam turbine to generate electricity or provide heat.

[0033] The inventors of this application have noticed that gas-steam combined cycle generator sets currently on the market do not make good use of the waste heat of the unit, and the energy utilization rate of gas-steam combined cycle generator sets is low.

[0034] In a gas-steam combined cycle power generation system, since the amount of gas compressed by the compressor is fixed, when the compressor load is adjusted, a large amount of high-temperature, high-pressure gas from the compressor outlet cannot be utilized by the gas turbine and needs to flow back to the low-pressure gas pipeline. This portion of gas passes through a pressure reducing valve and is then cooled by water spray before flowing back to the low-pressure gas pipeline. This high-temperature, high-pressure gas consumes a significant portion of the compressor's load, and the cooling system consumes a large amount of energy during the cooling process. After cooling and depressurization, the high-temperature, high-pressure gas transforms into low-temperature, low-pressure gas, resulting in a significant waste of energy and reducing the energy utilization rate of the gas-steam combined cycle power generation unit.

[0035] Based on the above problems, and to address the issue of low energy utilization in gas-steam combined cycle generator sets caused by energy waste from the large amount of high-temperature, high-pressure gas exiting the gas compressor, the inventors of this application have discovered that the high-temperature, high-pressure gas exiting the compressor that cannot be utilized by the gas turbine typically enters a low-pressure gas pipeline via a regulating bypass and cooling device. Therefore, the inventors designed a thermal system in which the regulating bypass is connected to a gas boiler. The high-temperature, high-pressure gas that cannot be utilized by the gas turbine flows into the gas boiler for combustion, thereby enhancing the utilization efficiency of the thermal system for the gas overflowing from the compressor unit outlet and effectively improving the energy utilization rate of the thermal system.

[0036] To address the problems of the prior art, embodiments of this application provide a thermal system and a method for controlling the thermal system. The thermal system provided in the embodiments of this application will first be described below.

[0037] Please see Figure 1 , Figure 1 A schematic diagram of a thermal system 1 provided for some embodiments of this application.

[0038] This application provides a thermal system, such as Figure 1 As shown, it includes a compression subsystem 2 and a gas boiler 12. The compression subsystem 2 includes a compressor unit 11 and a regulating bypass 13. The inlet end of the compressor unit 11 is connected to the gas pipeline, and the regulating bypass 13 is connected to the outlet end of the compressor unit 11. The gas boiler 12 is connected to the regulating bypass 13 so that the gas in the regulating bypass 13 can enter the gas boiler 12.

[0039] The compressor unit 11 is used to convert low-pressure gas into high-pressure gas, which then enters the gas turbine 16 to perform work. The gas turbine 16 is a turbine unit that converts the energy of gas combustion into kinetic energy. Optionally, a generator set 17 is connected to the outlet end of the gas turbine, which converts the kinetic energy of the turbine unit into electrical energy. The regulating bypass 13 is connected to the inlet end of the compressor unit 11. By changing the gas flow rate of the regulating bypass 13, the pressure at the outlet end of the compressor unit 11 is changed. The regulating bypass 13 and the inlet guide vanes at the inlet end of the compressor unit 11 cooperate to control the gas flow rate entering the gas turbine 16, thereby controlling the load of the entire thermal system 1.

[0040] Optionally, the fuel for the thermal system 1 is one or more of blast furnace gas, converter gas, and coke oven gas.

[0041] Optionally, compressor unit 11 includes an axial compressor.

[0042] Optionally, the gas boiler 12 is connected to the generator set 17.

[0043] In these embodiments, the compression subsystem 2 includes a compressor unit 11 and a regulating bypass 13. The gas is converted into high-temperature and high-pressure gas through the compressor unit 11. The regulating bypass 13 is used to control the state of the compressor unit 11. The regulating bypass 13 is connected to the outlet end of the compressor unit 11 and the gas boiler 12. At least part of the high-temperature and high-pressure gas entering the regulating bypass 13 from the compressor unit 11 will enter the gas boiler 12 for combustion, which enhances the ability of the thermal system 1 to recover and utilize the waste heat of the gas and improves the energy utilization rate of the thermal system 1.

[0044] Please see Figure 2 , Figure 2 For this application Figure 1 Enlarged view of point A in the middle.

[0045] In some embodiments, such as Figure 1 and Figure 2As shown, the regulating bypass 13 includes: a first bypass 131a and a first valve group 131b. The first bypass 131a is connected between the outlet end of the compressor unit 11 and the gas boiler 12. The first bypass 131a is used to regulate the surge degree of the compressor unit 11. The first valve group 131b is installed on the first bypass 131a. The first valve group 131b is used to control the gas flow rate in the first bypass 131a.

[0046] Surge of compressor unit 11 refers to the phenomenon of vibration of compressor unit 11 body caused by strong and irregular airflow oscillation during the operation of compressor unit 11.

[0047] The cause of surge in compressor unit 11 may be that the pressure in the pipeline after compressor unit 11 is higher than the outlet pressure of compressor unit 11, causing gas backflow and generating large-amplitude gas pulsation.

[0048] At this time, the first valve group 131b is adjusted so that some of the backflowing gas flows into the first bypass 131a, reducing the gas flow back to the compressor unit 11, thereby improving the surge phenomenon.

[0049] In these embodiments, the regulating bypass 13 includes a first bypass 131a and a first valve group 131b. The first bypass 131a and the first valve group 131b are used to regulate the surge condition of the compressor unit 11. The first bypass 131a is connected to the gas boiler 12. A portion of the high-temperature and high-pressure gas flowing out from the outlet end of the compressor unit 11 will enter the gas boiler 12 for combustion through the first bypass 131a, thereby improving the energy utilization rate of the thermal system 1.

[0050] In some embodiments, such as Figure 1 As shown, a control valve group 18 is provided on the first bypass 131a, and the control valve group 18 is located between the first valve group 131b and the gas boiler 12.

[0051] Optionally, the control valve assembly 18 consists of a manual valve and a blind valve arranged side by side.

[0052] Optionally, the first bypass 131a is provided with multiple sets of control valve groups 18.

[0053] In these embodiments, the control valve assembly 18 is located between the first valve assembly 131 and the gas boiler 12. In the event of shutdown, maintenance or other circumstances, the first bypass 131a can be completely cut off by the control valve assembly 18, thereby improving the safety of the thermal system 1.

[0054] In some embodiments, such as Figure 1 and Figure 2As shown, the regulating bypass 13 also includes a second bypass 132a and a second valve group 132b. The second bypass 132a is connected between the outlet end of the compressor unit 11 and the gas boiler 12, and is used to regulate the load of the compressor unit 11. The second valve group 132b is installed on the second bypass 132a and is used to control the gas flow rate in the second bypass 132a.

[0055] One end of the second bypass 132a is connected to the outlet end of the compressor unit 11. The pressure at the outlet end of the compressor unit 11 can be adjusted by regulating the gas flow rate in the second bypass 132a. The second bypass 132a cooperates with the inlet guide vane at the inlet end of the compressor unit 11 to control the gas flow rate entering the compressor unit 11, thereby controlling the load of the compressor unit 11.

[0056] Optionally, multiple second bypasses 132a and second valve groups 132b can be provided in the regulating bypass 13. The load of the compressor unit 11 can be precisely and quickly adjusted through the cooperation of multiple second bypasses 132a and second valve groups 132b.

[0057] In these embodiments, the regulating bypass 13 further includes a second bypass 132a and a second valve group 132b, which are used to regulate the load of the compressor unit 11. The second bypass 132a is connected between the outlet end of the compressor unit 11 and the gas boiler 12. During the process of regulating the load of the compressor unit 11, the gas entering the second bypass 132a from the compressor unit 11 will enter the gas boiler 12 for combustion, thereby improving the energy utilization rate of the thermal system 1.

[0058] Please see Figure 3 and Figure 4 , Figure 3 A schematic diagram of a thermal system 1 provided for other embodiments of this application; Figure 4 For this application Figure 3 Enlarged view of point B in the middle.

[0059] In some embodiments, the regulating bypass 13 further includes a third bypass 133a, a third valve group 133b, and a fourth bypass 134a and a fourth valve group 134b. The third bypass 133a is connected between the outlet end and the inlet end of the compressor unit 11 and is used to regulate the load of the compressor unit 11. The fourth bypass 134a is connected between the outlet end and the inlet end of the compressor unit 11 and is used to control the backflow of the compressor unit 11. The third valve group 133b is disposed on the third bypass 133a and is used to control the gas flow rate in the third bypass 133a. The fourth valve group 134b is disposed on the fourth bypass 134a and is used to control the gas flow rate in the fourth bypass 134a.

[0060] The fourth bypass 134a and the fourth valve group 134b are used to regulate the backflow of the compressor unit 11. The fourth valve group 134b is a backflow valve group. When the fourth valve group 134b is open, the gas flows back from the outlet end of the compressor unit 11 to the inlet end of the compressor unit 11 to maintain the pressure at the outlet and inlet of the compressor unit and ensure the normal operation of the compressor unit 11.

[0061] Optionally, the diameter of the fourth bypass 134a is larger than that of the third bypass 133a, so that the return flow of the fourth bypass 134a is greater.

[0062] In these embodiments, the third bypass 133a is connected between the outlet end and the inlet end of the compressor unit 11. The third bypass 133a is used to adjust the load of the compressor unit 11. During the adjustment of the load of the compressor unit 11, the gas entering the third bypass 133a from the compressor unit 11 will flow into the inlet end of the compressor unit 11, thereby reducing the probability of abnormal conditions occurring in the compressor unit 11 during the adjustment of the load. The fourth bypass 134a is connected between the outlet end and the inlet end of the compressor unit 11. The fourth bypass 134a is used to control the backflow of the compressor unit 11 to ensure that the compressor unit 11 can operate smoothly.

[0063] In some embodiments, such as Figure 3 and Figure 4 As shown, the regulating bypass 13 includes a cooling device 14, which is disposed on the third bypass 133a to cool the gas flowing from the third bypass 133a to the inlet end of the compressor unit 11, and / or disposed on the fourth bypass 134a to cool the gas flowing from the fourth bypass 134a to the inlet end of the compressor unit 11.

[0064] Optionally, the cooling device 14 can be a cooling tower.

[0065] Optionally, the cooling device 14 is located on the side of the third valve group 133b and / or the fourth valve group 134b away from the outlet end of the compressor group 11.

[0066] The cooling device 14 is installed on the third bypass 133a and / or the fourth bypass 134a to cool the high-temperature gas flowing into the third bypass 133a or the fourth bypass 134a from the outlet of the compressor unit 11. Compared with conventional thermal systems, the cooling device 14 does not need to cool the high-temperature gas in the first bypass 131a, thus reducing the loss of the cooling system.

[0067] In these embodiments, the cooling device 14 is provided on the third bypass 133a and / or the fourth bypass 134a to cool the gas flowing into the compressor unit 11 from the third bypass 133a and / or the fourth bypass 134a, so as to avoid the gas temperature entering the compressor unit 11 being too high and affecting the normal operation of the compressor unit 11.

[0068] In some embodiments, such as Figure 3 As shown, the thermal system 1 also includes an air compressor unit 15 and a gas turbine 16. The air compressor unit 15 is used to compress air; the gas turbine 16 is connected to the generator set 17, and the inlet end of the gas turbine 16 is connected to the air compressor unit 15 and the compressor unit 11.

[0069] In these embodiments, the thermal system 1 also includes an air compressor unit 15 and a gas turbine 16, in which the high-pressure gas and high-pressure air from the compressor unit 11 and the air compressor unit 15 are mixed and burned in the gas turbine 16, and the gas turbine 16 converts the energy of combustion into kinetic energy.

[0070] Please see Figure 5 , Figure 5 A flowchart illustrating the control method of a thermal system 1 provided in some embodiments of this application.

[0071] This application also provides a control method for a thermal system 1, such as... Figures 3 to 5 As shown, the control method for controlling the thermal system 1 described in the first aspect includes:

[0072] S1: During the start-up phase, compressor unit 11 starts up, gas enters compressor unit 11, and enters gas boiler 12 through regulating bypass 13;

[0073] S2: During operation, compressor unit 11 operates at rated load.

[0074] During the start-up phase, the gas turbine 16 is ignited and accelerates, while the first valve group 131b is fully open. After a period of time, gas begins to be introduced. As the speed of the gas turbine 16 increases, the opening degree of the first valve group 131b gradually decreases. The gas flowing from the outlet of the compressor unit 11 into the first bypass 131a enters the gas boiler 12 for combustion via the first bypass 131a.

[0075] In these embodiments, during the start-up phase, as the speed of the gas turbine 16 increases, the opening degree of the first valve group 131b gradually changes, and the gas flowing into the first bypass 131a from the outlet end of the compressor unit 11 enters the gas boiler 12 for combustion, thereby improving the energy utilization rate of the thermal system 1.

[0076] In some embodiments, such as Figures 3 to 5As shown, the thermal system 1 includes a first bypass 131a connected between the outlet end of the compressor unit 11 and the gas boiler 12. A first valve group 131b is installed on the first bypass 131a. The operation phase includes:

[0077] The opening degree of the first valve group 131b is maintained at 12%-17%.

[0078] The opening degree of the first valve group 131b is maintained at 12%-17%, which means that the flow area of ​​the first valve group 131b at this time is only 12%-17% of the flow area when the first valve group 131b is fully open.

[0079] Optionally, the opening degree of the first valve assembly 131b is maintained at 13.8%.

[0080] In these embodiments, the opening degree of the first valve group 131b is maintained at 12%-17% during the operation phase, which improves the problem of severe surge phenomenon of compressor unit 11 caused by the opening degree of the first valve group 131b being too low, and also improves the problem of reduced efficiency of compressor unit 11 caused by the opening degree of the first valve group 131b being too high.

[0081] In some embodiments, such as Figures 3 to 5 As shown, the thermal system 1 includes a third bypass 133a connected between the outlet end and the inlet end of the compressor unit 11, the third bypass 133a being used to regulate the load on the compressor unit 11; a fourth bypass 134a connected between the outlet end and the inlet end of the compressor unit 11, the fourth bypass 134a being used to control the recirculation status of the compressor unit 11; a cooling device 14 is provided on the third bypass 133a and / or the fourth bypass 134a, and the start-up phase includes:

[0082] Start the cooling device 14 to cool the gas flowing from the third bypass 133a and / or the fourth bypass 134a to the inlet of the compressor unit 11.

[0083] In these embodiments, the start-up phase includes activating the cooling device 14 to cool the gas flowing from the third bypass 133a and / or the fourth bypass 134a to the inlet of the compressor unit 11, thereby mitigating the problem of reduced efficiency of the compressor unit 11 due to excessively high gas temperature at the inlet of the compressor unit 11.

[0084] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to identify names and not to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A thermal system, characterized in that, include: A compression subsystem includes a compressor unit and a regulating bypass. The inlet end of the compressor unit is connected to a gas pipeline, and the regulating bypass is connected to the outlet end of the compressor unit. The compressor unit is used to convert low-pressure gas into high-pressure gas. The regulating bypass includes a first bypass, a second bypass, a third bypass, and a fourth bypass. The first bypass is used to regulate the surge level of the compressor unit, the second bypass is used to regulate the load of the compressor unit, the third bypass is used to regulate the load of the compressor unit, and the fourth bypass is used to control the backflow of the compressor unit. Air compressor units are used to compress air; A gas turbine, the inlet end of which is connected to the air compressor unit and the compressor unit; A gas-fired boiler is connected to a regulating bypass so that the gas from the regulating bypass can enter the gas-fired boiler.

2. The thermal system according to claim 1, characterized in that, The first bypass is connected between the compressor unit outlet and the gas boiler; The regulating bypass includes: The first valve group is installed on the first bypass and is used to control the gas flow rate in the first bypass.

3. The thermal system according to claim 2, characterized in that, A control valve group is provided on the first bypass, and the control valve group is located between the first valve group and the gas boiler.

4. The thermal system according to claim 1, characterized in that, The second bypass is connected between the compressor unit outlet and the gas boiler; The regulating bypass also includes: The second valve assembly is installed on the second bypass and is used to control the gas flow rate in the second bypass.

5. The thermal system according to claim 1, characterized in that, The third bypass is connected between the outlet end of the compressor unit and the inlet end of the compressor unit; The fourth bypass is connected between the outlet end of the compressor unit and the inlet end of the compressor unit. The regulating bypass also includes: A third valve assembly is provided on the fourth bypass, and the third valve assembly is used to control the gas flow rate in the third bypass. A fourth valve assembly is provided on the fourth bypass, and the fourth valve assembly is used to control the gas flow rate in the fourth bypass.

6. The thermal system according to claim 5, characterized in that, The regulating bypass includes: A cooling device is provided on a third bypass to cool the gas flowing from the third bypass to the inlet of the compressor unit, and / or is provided on a fourth bypass to cool the gas flowing from the fourth bypass to the inlet of the compressor unit.

7. A method for controlling a thermal system, used to control the thermal system according to any one of claims 1-6, characterized in that, include: During the start-up phase, the compressor unit starts up, and the gas enters the compressor unit and then enters the gas boiler through the regulating bypass. During operation, the compressor unit operates at rated load.

8. The control method according to claim 7, characterized in that, The thermal system includes a first bypass connecting the compressor unit outlet end and the gas boiler, and a first valve group is installed on the first bypass. The operation phase includes: The opening degree of the first valve group is maintained at 12%-17%.

9. The control method according to claim 8, characterized in that, The thermal system includes a third bypass connected between the outlet end and the inlet end of the compressor unit, the third bypass being used to adjust the load on the compressor unit; A fourth bypass is connected between the outlet end and the inlet end of the compressor unit, the fourth bypass being used to control the backflow status of the compressor unit; A cooling device is provided on the third bypass and / or the fourth bypass, and the start-up phase includes: The cooling device is activated to cool the gas flowing from the third bypass and / or the fourth bypass to the inlet of the compressor unit.

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