Compound nozzle and thermal reboiling system

Abstract

A compound nozzle belongs to the field of fluid power machinery, which can be used for and is not limited to increasing the endothermic medium in the deceleration pressure expansion process after the thermal fluid is injected and expanded through the nozzle, so that the thermal fluid expansion work is greater than the compression work to realize the thermal dynamic conversion and increase the power. A two-stage nozzle or a multi-stage nozzle is arranged in sequence according to the fluid flow direction to form a compound pressure boosting nozzle. The outlet of the front-stage nozzle is communicated with the inlet of the rear-stage nozzle. Each intermediate-stage nozzle is both the front-stage nozzle of the rear-stage nozzle and the rear-stage nozzle of the front-stage nozzle. It is simple and low in cost. In addition, a thermal power re-pressurization system is provided. The injection type pressure boosting device is used as a primary pressure boosting device, and the high-pressure working medium subjected to forced heat removal and cooling is used as the power source of the primary injection type pressure boosting device, so that the pressure can be more stably obtained for re-pressurization, and the low-cost high-parameter high-efficiency advantage of the re-pressurization thermal cycle can be more easily fully utilized.

Description

Technical Field

[0001] This invention belongs to the field of thermal power or fluid power machinery. Background Technology

[0002] Currently, there is a temperature difference of about 500°C between the main steam and the flue gas in the furnace of the steam unit of the thermal power plant. The exhaust gas temperature of the gas turbine and the internal combustion engine in a single cycle is also about 500°C. That is, modern thermal power cycle units generally have a large temperature difference loss or high temperature emission loss.

[0003] Another scenario is that the pressure of large steam turbine units generally reaches supercritical combined with vacuum condensation, which is a case of excess pressure and insufficient temperature. Therefore, one or more reheat cycles are generally used to achieve a good match between temperature and pressure, and the steam temperature is always released to the minimum. Therefore, increasing the pressure parameters and increasing the reheat cycle has always been the direction for modern units to improve efficiency.

[0004] Therefore, the biggest fundamental problem in the field of thermal engineering is that pressure and temperature are difficult to match fully. There is a reheat cycle but no repressurization cycle. It is powerless to deal with the high temperature difference loss of boiler water-cooled walls and superheaters, as well as the high temperature exhaust heat loss of single-cycle gas turbines and internal combustion engines.

[0005] Related document 1 is the invention patent application 202111329465.8, which proposes a "thermal system employing thermal pressurization" that can achieve repressurization cycle. The proposed pressurization injector has a low-cost advantage and, at least theoretically, can achieve matching of pressure and temperature parameters for work and emissions, representing a promising breakthrough. However, the specific solution has the following problems:

[0006] (1) The booster injector always increases the throat diameter as much as possible or even does not use the throat structure to reduce throat resistance. This results in the working fluid passing through the throat at a speed very close to the nozzle outlet speed, which is much greater than the speed of sound or even several times the speed of sound. This makes the subsequent diffuser tube very long and its diameter gradually becomes very large. This makes the overall equipment always occupy a large space and the flow loss along the process is large, thus diminishing the low cost advantage. Moreover, the long pressure feedback cycle increases the difficulty of controlling stability.

[0007] (2) The stability control of the jet-type repressurization cycle is a difficult point. Although the application proposes to add a low-pressure control scheme in the jet chamber, it does not pay attention to the importance of rapid and thorough heat dissipation of the circulation system for stable control. The stability control still has risks and seriously affects the practicality. The repressurization cycle still needs to be optimized as a whole and made substantial breakthroughs.

[0008] (3) The heat dissipation method adopts the addition of compressed gas or liquid cooling medium, which will inevitably increase the system circulation flow, thereby increasing the waste heat discharge and affecting the system thermal efficiency; in addition, various specific schemes mainly rely on water cooling, and the gas-liquid separator system needs to be configured to save water, which is complex and costly. Even so, water or water vapor will be discharged when using open or semi-open circulation, which is not good for environmental protection.

[0009] (4) Using a gas-water separator or a special gas storage pressure vessel as the starting power for the system results in a large size and high cost for systems used in mobile devices.

[0010] (5) The primary booster jet uses a high-temperature and high-pressure power gas source to draw low-pressure and low-temperature working gas from the jet distributor. The internal jet velocity difference is very large, resulting in large flow loss and low efficiency.

[0011] (6) Combustion compressed air or liquefied fuel can absorb heat before combustion. Since fuel or combustion compressed air is not used as a heat-absorbing medium in gas power systems, there is greater potential for the application of jet-type thermal pressurization or repressurization. Summary of the Invention

[0012] The purpose of this invention is to improve the jet-type pressurization device, systematically and comprehensively optimize the repressurization cycle, substantially improve the practicality of the repressurization cycle, and significantly reduce costs while increasing thermal efficiency.

[0013] The technical solution of this invention comprises two parts: a novel jet-type pressurization device and a novel thermal repressurization system.

[0014] This paper first proposes a compound nozzle, belonging to the field of fluid dynamics machinery. It can be used, but is not limited to, adding heat dissipation and cooling measures during the expansion and deceleration diffusion process of hot fluids through the nozzle, thereby increasing the thermal power conversion by making the expansion work greater than the compression work. Its characteristics are: a compound pressure-boosting nozzle is formed by arranging two or more stages of nozzles sequentially according to the fluid flow direction; the outlet of the first stage nozzle is connected to the inlet of the second stage nozzle; each intermediate stage nozzle is both the preceding and following stage nozzle of its preceding stage; the first or intermediate stage nozzles adopt a gradually contracting and expanding structure, and the final stage nozzle adopts a gradually contracting and expanding structure or a gradually contracting structure. Generally, the compound nozzle uses a heat-absorbing medium channel to introduce a heat-absorbing medium (such as water, liquid nitrogen, or compressed gas) to achieve heat dissipation and cooling of the internal hot fluid. It can also be used for high-speed jet mixing in non-thermal processes.

[0015] The compound nozzle structure utilizes the characteristic that the hot airflow generates a supersonic jet through the gradually converging and expanding nozzle, and then generates a shock wave in the converging inlet of the subsequent nozzle to rapidly diffuse the pressure. This replaces the traditional injector's slow deceleration and diffusion mode using a throat and diffuser tube, which can significantly reduce the size and cost. It can be directly connected to high-temperature and high-pressure thermal systems such as combustion chamber outlet flue gas and steam thermal pipelines to achieve repressurization.

[0016] Simultaneously, a thermodynamic repressurization system is proposed, belonging to the field of thermal power or fluid power machinery. The thermodynamic injection system utilizes the expansion of hot fluid through a nozzle, followed by the addition of a heat-absorbing medium or heat-dissipating measures during the deceleration and diffusion process, so that the expansion work of the hot fluid is greater than the compression work, thereby achieving thermodynamic conversion and increasing power. Its characteristics are: the thermodynamic injection system adopts a jet-type pressurization device, which includes, but is not limited to, an inlet nozzle and a deceleration and diffusion channel. The hot fluid enters the interior of the jet-type pressurization device through the inlet nozzle, and after gradual contraction and diffusion, it is discharged from the outlet. A circulating cooling channel is connected between the outlet channel of the jet-type pressurization device or its branch channel and its cooling medium inlet nozzle. A heat dissipation device is connected to the circulating cooling channel, forming a circulating cooling thermodynamic repressurization system.

[0017] This thermodynamic repressurization system can be used for pressurization and repressurization of unpressurized or pressurized gases. It is more flexible in its application to external work and output of compressed gas, as well as in various heat pump systems. It is easier to fully utilize the advantages of low cost, high parameters, and high efficiency by matching the pressure and temperature parameters of the repressurization thermodynamic cycle. The implementation method will be further explained in conjunction with the accompanying drawings.

[0018] Another similar system proposed is a thermodynamic repressurization system, belonging to the field of thermal power or fluid power machinery. The thermodynamic injection system utilizes the expansion of hot fluid through a nozzle, followed by the addition of a heat-absorbing medium or heat-dissipating measures during the deceleration and diffusion process. This makes the expansion work of the hot fluid greater than the compression work, achieving thermodynamic conversion and increasing power. Its characteristics are: the thermodynamic injection system adopts a jet-type pressurization device, which includes, but is not limited to, an inlet nozzle and a deceleration and diffusion channel. The hot fluid enters the interior of the jet-type pressurization device through the inlet nozzle, and after gradual contraction and diffusion, it is discharged from the outlet. A circulating cooling channel is connected between the outlet channel of the jet-type pressurization device or its branch channel and its cooling medium inlet nozzle. A heat dissipation device is connected to the circulating cooling channel, forming a circulating cooling thermodynamic repressurization system.

[0019] Advantages of the present invention

[0020] 1. Combined with heat dissipation measures, the compound nozzle turns the disadvantage of the converging tube generating supersonic shock waves and rapidly increasing pressure into an advantage. Compared with the traditional booster injector that requires a large diffuser tube, it greatly simplifies the structure, reduces the volume and lowers the cost, and avoids the flow loss of a long diffuser tube, which is a significant advantage over the traditional booster injector.

[0021] When a compound nozzle composed of multiple nozzle stages is used for pressurization and repressurization, the outlet of each nozzle stage can be directly the pre-stage nozzle of the subsequent nozzle. When the overall compound nozzle is used for jet power, it can be used directly as a nozzle. Compared with traditional injectors, which must add nozzles to generate jet power after deceleration and diffusion in the diffuser tube, this can further reduce the space occupied and reduce flow loss.

[0022] In addition to being used for thermal pressurization and repressurization, compound nozzles can also be used for high-speed jet mixing in non-thermal processes, such as for jet pumping, where they can also take advantage of rapid pressurization and low flow loss.

[0023] 2. Maintaining stable pressure boosting operation of the jet-type pressurization device is a challenge. The literature proposed using heat-absorbing media for heat dissipation, connecting its interior to a low-pressure environment to force internal pressure reduction for heat dissipation, and using a jet distributor for heat dissipation. Based on this, the present invention proposes a circulation heat dissipation method that adds circulation channels and heat dissipation devices to ensure rapid and thorough heat dissipation. It also proposes using fuel as a heat-absorbing medium in the combustion chamber or reburning chamber to ensure that the jet-type pressurization device operates at the maximum possible expansion and compression ratio, thus ensuring stable operation of the jet-type pressurization device.

[0024] 3. In the thermal cycle, the jet-type booster device adopts a circulating cooling method with increased branch channels, so that the cooling medium only circulates locally and does not participate in the overall circulation, which greatly reduces the overall circulation flow of the system and thus greatly reduces waste heat emission and greatly improves thermal efficiency; moreover, it can eliminate the need for water cooling and gas-water separation devices, which can completely avoid water consumption, further simplify the system, reduce costs, save water resources and benefit the environment.

[0025] 4. Using a booster pump as the starting power source provides more flexible and reliable stability control compared to using a gas-water separator or a dedicated gas storage pressure vessel. This is especially beneficial for thermal systems used in mobile devices, as it can further reduce size and lower costs.

[0026] 5. The use of a circulating cooling method is beneficial for achieving high-pressure, low-temperature injection of the inlet cooling medium of the primary booster injector, while the low-pressure gas source absorbed at the inlet can be easily heated to achieve high-temperature, low-pressure injection, which can minimize the velocity difference between the two and thus reduce flow losses.

[0027] 6. The jet-type booster device adopts a branch channel circulation cooling method, which makes it easier for the overall system to realize combined heat and power generation, and even includes a multi-functional working mode of providing compressed air or using compressed gas for energy storage. Moreover, when used in a heat pump, it can achieve zero compression work loss, which is impossible for traditional heat pumps.

[0028] 7. One of the proposed new solutions is that the primary booster unit located after the external heat exhaust device adopts a compressor driven by an expansion work device. The compressor is completely freed from the high-temperature environment and can make the thermal repressurization system work more stably. When the heating device is a combustion chamber, it constitutes the thermoelectric cooling of the gas power and provides compressed air and energy storage to the outside. It is especially suitable for external heating. The heat pump effect can be used to increase the heating coefficient many times.

[0029] 8. The repressurization thermal system can directly convert the heater into a combustion chamber to become a gas thermal system. The new structure of the jet-type pressurization device can use compressed air or fuel as the heat absorption medium. The compound nozzle composed of two-stage nozzles or multi-stage nozzles can be used in the combustion chamber or re-combustion chamber to achieve pressurization combustion or repressurization and re-combustion. Not only does the fuel increase the combustion temperature due to preheating, but it can also reduce the heat exhaust medium, thereby reducing the tail smoke volume and waste heat loss. The thermal system will not only be more stable, but its thermal efficiency will also be significantly improved.

[0030] 9. In summary, the overall solution of the present invention can reliably achieve a good match between pressure and temperature throughout the entire process of the thermodynamic system, making it easy for the working fluid to fully expand and do work from high temperature to low temperature. It substantially optimizes the advantages of thermodynamic injection pressurization, and can ensure the maximum realization of low-cost, high-efficiency and stable operation, which will surely have a wide range of applications. Attached Figure Description

[0031] Figure 1 2 and 3 are three types of compound nozzles in which the outlet of the pre-stage nozzle is directly connected to the inlet of the post-stage nozzle. Figure 4 It is a compound nozzle whose outlet is located in the inlet guide channel of the subsequent nozzle. Figure 5 It is a compound nozzle composed of multiple nozzle stages; Figure 6 It is a compound nozzle that adopts a bent-tube jet splitter structure; Figure 7 Is with Figure 8 It features a double nozzle with an added circulating heat dissipation device; Figure 9 Is with Figure 10 It features a two-stage compound nozzle with an added circulating heat dissipation device; Figure 11 It is a gas power system that uses a compound nozzle at the combustion chamber outlet; Figure 12 This is a schematic diagram of the thermal process of an internal combustion engine with a compound nozzle in the tail exhaust passage. Figure 13 The compressor outlet uses a thermal repressurization system with a circulating heat exhaust jet pressurization device; Figure 14 A thermal repressurization system that draws in unpressurized or low-pressure air; Figure 15 It is a closed-loop thermo-repressurization system; Figure 16 A thermal repressurization system with an added circulating heating channel; Figure 17 It adds a circulating heating channel for the heat pump's thermal repressurization system; Figure 18 The multi-stage jet pressurization process employs a thermodynamic repressurization system with a common heat dissipation device; Figure 19 The multi-stage jet pressurization process employs a thermal repressurization system with its own independent heat dissipation device; Figure 20 The primary pressurization unit uses a thermodynamic repressurization system based on a compressor. Figure 21 The primary booster device uses a compressor injection type booster device, which is the gas power system of the combustion chamber; Figure 22 It is a subsystem of the thermal repressurization system used to provide compressed air to gas-powered systems; Figure 23 It is a repressurized combustion chamber with an injection-type pressurization device structure; Figure 24 It is a repressurization and reburning injection pressurization device that can use both oxidizing and reducing fuels as the heat-absorbing medium; Figure 25 It is a two-stage reburning jet-type repressurization device consisting of three nozzles; Figure 26 It is a reburning injection booster device composed of traditional injectors; Figure 27 and 28 The flue gas passage terminal of the thermal repressurization gas power system has been equipped with an injection splitter for external heating or cooling. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below with reference to each claim:

[0033] Implementation method 1, as shown in the attached document Figure 1 The compound nozzles shown in Figures 2, 3, and 4 are characterized by employing two stages of nozzles arranged sequentially in the fluid flow direction (as indicated by the internal arrows) to form a compound pressure-boosting nozzle. The outlet of the first-stage nozzle 1 is connected to the inlet of the second-stage nozzle 4. The difference lies in the slightly different connection method between the two stages of nozzles, which is designed to accommodate the arrangement of the heat-absorbing medium channel 2 and the heat-absorbing medium nozzle 3. (See attached figure.) Figure 4 The connection method of the heat absorption medium channel 2 is a general schematic diagram of the heat absorption medium channel and does not represent a specific structure.

[0034] As attached Figure 5 The compound nozzle shown consists of multiple nozzle stages, and is attached to... Figure 4 Based on this, intermediate nozzles are added. The characteristic of this is that each intermediate nozzle is both the pre-stage nozzle of its subsequent nozzle and the post-stage nozzle of its pre-stage nozzle. The pre-stage or intermediate nozzles can adopt a tapered and expanded structure. In general, the final nozzle also adopts a tapered and expanded structure. When the outlet pressure is not high and close to the sonic pressure, a simple tapered structure can be used.

[0035] The compound nozzle can be used to add a heat-absorbing medium (usually water, liquid nitrogen or other evaporable liquids, or low-temperature compressed air or other compressed gases that can achieve expansion and cooling) during the deceleration and diffusion process after the hot fluid expands through the nozzle. This makes the expansion work of the hot fluid greater than the compression work, achieving thermodynamic conversion and increasing power. The advantage is that the front nozzle can adopt a gradually contracting and expanding structure, which can easily generate a supersonic jet of pressurized hot air. In addition, the shock wave generated in the inlet diffuser of the secondary nozzle mixes with the heat-absorbing medium, and the pressure is increased and heat is discharged at the same time.

[0036] Compound nozzles can be used in both low-flow and high-flow equipment. When used in high-flow equipment, they can also be called compound nozzle pipes. Here, we will refer to them as compound nozzles.

[0037] Compound nozzles can also be used for non-thermal processes to rapidly mix or merge fluids of different pressures using high-speed jets, so that the fluid's kinetic energy can be quickly converted into pressure and the loss of kinetic energy can be reduced, for example, for jet pumping.

[0038] In implementation method 2, the compound nozzle can adopt the following structure and specific methods of adding heat-absorbing medium or adding heat-dissipating measures to achieve an expansion work of the hot fluid that is greater than the compression work:

[0039] (1) As attached Figure 1 The compound nozzles shown in 2, 3, 4, and 5 have added heat-absorbing medium channels 2, which introduce heat-absorbing medium into the flow channel between the two nozzle stages or into the flow channel of the rear nozzle stage.

[0040] (2) As attached Figure 6 The compound nozzle shown adopts a bent-tube jet splitter structure. The inlet nozzle 1 of the jet splitter is the pre-stage nozzle, and the outer splitting channel 8 of the bent tube 7, which adopts a scaling splitting structure, is the rear-stage nozzle, while the inner splitting channel 9 is the heat dissipation channel. This bent-tube compound nozzle is mainly used in situations where the hot fluid is a saturated working medium or a mixed fluid containing liquid. The bent tube plays a centrifugal splitting role, and the hot fluid automatically evaporates and dissipates heat after being injected. The outer fluid achieves low-temperature diffusion in the outer rear-stage nozzle. Some of the gas in the hot fluid absorbs heat during the injection expansion process and is discharged from the inner outlet to carry away the heat, which is an automatic heat dissipation measure.

[0041] (3) As attached Figure 7 and 8 The illustrated double nozzle has an added circulating heat dissipation device. Figure 7 As shown, a recirculation channel 12 is led out from the outlet channel of the compound nozzle 10 and connected to the heat-absorbing medium nozzle 11. Figure 8As shown, a branch diffuser 14 is drawn from the throat of the downstream or final stage nozzle. The outlet of the branch diffuser is connected to the heat-absorbing medium nozzle 11 via a recirculation channel 12. A heat exhaust device 13 is added to the recirculation channel 12. The heat-absorbing medium nozzle 11 shown in the figure can be regarded as one of the parallel pre-stage nozzles, but as mentioned above, the heat-absorbing medium nozzle can also inject the heat-absorbing medium into the compound nozzle from other positions.

[0042] As attached Figure 9 and 10 The illustrated double nozzle with added circulating heat dissipation device is attached. Figure 7 Based on the above, a secondary compound nozzle 15 is added. The outlet of the pre-stage compound nozzle 10 is connected to the inlet nozzle of the secondary compound nozzle 15. A recirculation channel is led out from the outlet channel of the secondary compound nozzle 15 and connected to the heat absorption medium nozzle 11 of the pre-stage compound nozzle 10. A heat exhaust device is added to the recirculation channel. The heat absorption medium led out from the secondary compound nozzle has a higher pressure and a better heat absorption effect.

[0043] (4) As attached Figure 25 As shown, the inlet of the rear nozzle of the compound nozzle has two or more tapering channels, which are connected to the outlets of two or more front nozzles. The two or more tapering channels of the rear nozzle merge into one channel at the end, and a heat-absorbing medium channel is added to introduce different heat-absorbing media into the two rear nozzles or the flow guide channel of the rear nozzle. This compound nozzle is mainly used in the combustion chamber or reburning chamber of the gas power system. When oxidizing fuel and reducing fuel are used as heat-absorbing media at the same time, it can realize the pressure increase before combustion to avoid premature combustion during pressure increase.

[0044] In addition, based on the aforementioned structural form, the compound nozzle can also adopt the following specific structures:

[0045] (5) As attached Figure 1 The compound nozzles shown in Figures 2 and 3 have the outlet of the pre-stage nozzle directly connected to the inlet of the post-stage nozzle; or as shown in the appendix... Figure 4 The compound nozzle shown has its outlet located within the inlet guide channel of the subsequent nozzle.

[0046] (6) As attached Figure 7 The compound nozzle 10 shown can have two or more nozzles arranged in parallel as its pre-stage nozzles. The parallel pre-stage nozzles can be the same or different hot fluid nozzles, or they can be a hot fluid nozzle and a heat-absorbing medium nozzle.

[0047] (7) The pre-stage nozzle and the external extraction nozzle are arranged side by side at the inlet of the pre-stage nozzle. The hot fluid jet can easily create a vacuum inside the compound nozzle, and the gas being extracted can easily reach supersonic speed jet through the nozzle. This is conducive to the rapid and efficient mixing and pressurization of the two fluids with less kinetic energy loss, thus achieving efficient extraction.

[0048] (8) The ratio of the minimum flow area of ​​the downstream nozzle to the outlet flow area of ​​the upstream nozzle is less than 0.9; this is one of the more intuitive features that distinguishes it from traditional injectors. In order to reduce throat resistance, the throat flow area of ​​traditional injectors is generally designed to be no less than the sum of the nozzle outlet areas.

[0049] (9) As attached Figure 3 The added valve 5 and attachment in the compound nozzle Figure 4 The addition of a one-way valve 6 to the intermediate compound nozzle allows for the addition of a channel to connect to a low-pressure device, or to connect to an external vacuum pump, or to connect to the atmospheric environment, ensuring a low-pressure or vacuum state inside the compound vacuum system, which is beneficial for maintaining stable operation of the compound nozzle.

[0050] (10) For larger power equipment, such as gas turbines, the combustion chamber outlet often adopts an annular nozzle or a multi-nozzle annular distribution structure. Therefore, larger compound nozzles can also adopt an annular structure of at least one of the front nozzle and the rear nozzle or a multi-nozzle annular distribution.

[0051] (11) The compound nozzle adopts two or more parallel connection methods and increases the number of compound nozzles to control the conduction of the inlet valve. This is beneficial for the compound nozzle to be used in thermal systems with variable load operation. The flow load change needs can be met by adjusting the number of compound nozzles in operation.

[0052] Implementation method 3: Traditional thermodynamic cycle systems can increase power by adding a compound nozzle. This involves using a heat-absorbing medium or heat-dissipating measure during the deceleration and diffusion process after the hot fluid expands through the nozzle, ensuring that the expansion work of the hot fluid exceeds the compression work, thus achieving thermodynamic conversion. This requires the compound nozzle to have a structure that allows for heat dissipation of the internal hot fluid. Specifically, the compound nozzle can be used in the following applications to achieve repressurization cycles:

[0053] (1) As attached Figure 11 The thermal system shown is a gas-fired power system. The combustion chamber 18 outlet nozzle uses a compound nozzle 19. The rear nozzle of the compound nozzle, which is not shown in the figure, is a schematic diagram of the position of the rear nozzle extending into the gas turbine 21 directly opposite the turbine first stage blade. The compressor 20 outlet passage 16 provides compressed air to the combustion chamber 18. Fuel enters the combustion chamber from the fuel passage 17. The use of a compound nozzle 19 at the combustion chamber outlet nozzle can also be regarded as the combustion chamber outlet nozzle being used as a pre-stage nozzle of the compound nozzle.

[0054] (2) Similarly, a compound nozzle structure can be used to achieve repressurization between the two turbines of a gas turbine, or between turbine blade stages (in fact, there may be no strict boundary between turbines and blade stages in actual engineering).

[0055] (3) Similarly, in the modification of gas turbines, the first stage blade or a certain stage blade is removed, or two or more stages of blades are removed in a discontinuous manner. A channel for passing through the heat-absorbing medium is added between the nozzles before and after the removed blades to form a compound pressure-boosting nozzle structure, which is similar to forming a ring distribution of multiple compound nozzles.

[0056] (4) As attached Figure 12 The illustrated thermal system is a schematic diagram of the thermal process of an internal combustion engine. The left half 23 of the internal combustion engine represents the compression stroke, and the right half 24 represents the combustion expansion stroke. Fuel enters the internal combustion engine through the fuel passage 22. The exhaust passage of the internal combustion engine is connected to the compound nozzle 19, which directly generates jet power. Alternatively, as shown in the figure, the outlet of the compound nozzle 19 is connected to the expansion power device 25. Similarly, the exhaust passage of other gas power systems can also be equipped with compound nozzles to generate the same power. It should be noted that the flue gas entering the inlet of the compound nozzle must have sufficient residual pressure to meet the normal operation of the compound nozzle.

[0057] (5) The thermal system is a steam thermal system. There are compound nozzles connected at any point from the feedwater pump pipeline to the main steam pipeline. A heater is arranged between the compound nozzle and the steam turbine, which can enable the small and medium-sized steam thermal system to be repressurized to improve parameters and thus improve thermal efficiency.

[0058] (6) The power unit provides the heat-absorbing medium to the compound nozzles through the heat-absorbing medium channel. The heat-absorbing medium is an easily evaporable liquid or a low-temperature compressed gas. Alternatively, a branch can be drawn from the low-temperature working fluid channel inside the thermal system to connect to the heat-absorbing medium channel of the compound nozzles. For example, in a steam thermal system, a branch can be drawn from the feedwater channel to connect to the heat-absorbing medium channel. Figure 13 A branch can be drawn from the nozzle outlet channel on the outside of the jet splitter to connect to the heat absorption medium channel.

[0059] Implementation method 4, as shown in the appendix Figure 14 The illustrated thermal repressurization system utilizes a thermal injection system where a hot fluid expands through a nozzle and then absorbs heat during the deceleration and diffusion process, resulting in the expansion work of the hot fluid exceeding the compression work and achieving thermal-dynamic conversion to increase power. The system is characterized by employing a jet-type pressurization device 27, which includes, but is not limited to, an inlet nozzle 271 and a deceleration and diffusion channel 272. The hot fluid discharged from the compressor 26 outlet enters the jet-type pressurization device through the inlet nozzle 271, undergoes gradual contraction and diffusion, and is discharged from the outlet. A circulating cooling channel 28 connects the outlet channel of the jet-type pressurization device or its branch channel to the cooling medium inlet nozzle 273. A heat dissipation device 29 is connected to the circulating cooling channel, forming a circulating cooling thermal repressurization system.

[0060] Appendix Figure 14The overall feature is a compressor repressurization system, which utilizes the fact that the temperature of the gas will inevitably rise after compression to become a pressurized hot gas flow, which has the conditions to do thermal work. It adds a channel 274 connecting to the atmospheric environment or other low-pressure environments and a valve (generally a controllable valve, or a one-way valve for automatic control, which exhausts to the outside when the pressure is higher than atmospheric pressure and automatically closes when the pressure is lower than atmospheric pressure) to maintain the ejector in a sufficient pressure difference to maintain a stable repressurization state.

[0061] The jet-type pressurization device 28 may include a compound nozzle with added heat dissipation device or structure, a conventional ejector, a jet distributor, a jet ejector, and other fluid power devices with jet expansion and deceleration diffusion. When the internal jet velocity is greater than the speed of sound, especially much greater than the speed of sound, a compound nozzle diffusion mode with a gradually contracting and expanding diffusion channel can be used, or a conventional ejector structure can be used. However, when the internal jet velocity is lower than the speed of sound, only a conventional ejector can be used, that is, only a gradually expanding channel diffusion mode with increased tail diffuser length can be used.

[0062] Implementation method 5: To adapt to various engineering applications, the thermal repressurization system can adopt the following structure or circulation method:

[0063] (1) As attached Figure 13 As shown, the inlet nozzle of the jet-type booster device is connected to the compressor outlet channel.

[0064] (2) As attached Figure 14 As shown, the inlet channel connected to the inlet nozzle of the jet-type booster device draws in a low-temperature air source from the outside, and a heating device 30 is arranged on the hot fluid channel; a branch channel 31 is added to the outlet channel to provide a compressed air source to the outside or to connect with the expansion power device; a booster pump 33 (generally an air pump, i.e., an air compressor, or a water pump when the cooling medium of the system is water) is added to the circulation channel to generate circulation power during startup and to maintain a stable pressure when the pressure is unstable. The system screen is a continuous process of boosting and re-boosting during startup and when pressure needs to be increased due to instability.

[0065] (3) As attached Figure 15 As shown, the thermal boosting system adopts a closed-loop thermal circulation method. A jet distributor 35 is connected to the outlet channel of the heat exhaust device 29. The curved outer channel of the jet distributor is connected to the cooling nozzle of the jet boosting device, and the curved inner channel of the jet distributor is connected to the inlet hot fluid nozzle of the jet boosting device. A heating device is arranged on the connecting channel. The added booster pump 33 is connected in series in the circulation channel, and a check valve 32 is connected in parallel between the inlet and outlet of the booster pump. In this way, the booster pump can be stopped when the system is working stably. In addition, as shown in the figure, both the cooling medium nozzle and the hot fluid nozzle are arranged at the inlet position of the jet boosting device. In actual applications, the cooling medium nozzle can also be arranged at other lateral positions.

[0066] The system is used as a heat pump, with the heat dissipation device 29 providing a heat source to the outside, or a heat absorption device 36 added to the outlet channel on the outside of the bend of the jet distributor to provide a cold source to the outside; or the system is used to perform external work, with an expansion work device 34 connected in the channel between the outlet of the jet booster device and the inlet of the heat dissipation device; or the system is equipped with both the heat absorption device 29 and the expansion work device 34, forming a multifunctional system with both heat pump and external work functions.

[0067] (4) As attached Figure 16 As shown, a circulating heating channel is added between the outlet channel and the inlet nozzle of the jet booster device, and a heating device 30 is arranged on the circulating heating channel; the jet booster device adds an inlet channel on the inlet side to draw in the working medium, and adds a branch channel on the outlet channel to provide compressed air source to the outside or connect to the expansion power device 34.

[0068] (5) As attached Figure 17 As shown, a circulating heating channel is added between the outlet channel and the inlet nozzle of the jet booster device, and a heating device 30 is arranged on the circulating heating channel; the jet booster device adds an inlet channel on the inlet side to draw in the working fluid; a jet distributor is connected to the outlet channel of the heat exhaust device 29, the curved outer channel of the jet distributor is connected to the cooling nozzle of the jet booster device, and the curved inner channel of the jet distributor exhausts to the outside or is connected to the added inlet channel of the jet booster device;

[0069] The system is used for a heat pump, wherein the heat exhaust device provides a heat source to the outside, or a heat absorption device is added to the outlet channel outside the bend of the jet splitter to provide a cold source to the outside; or a branch channel is added to the outlet channel of the jet booster to provide a compressed air source to the outside; or the system is simultaneously arranged with the heat absorption device and the branch channel providing a compressed air source to the outside.

[0070] (6) As attached Figure 18 As shown, the jet-type pressurization device is a primary pressurization device 49, and one or more repressurization jet-type pressurization devices 41 and 43 are connected in series in its outlet channel.

[0071] As attached Figure 19 As shown, each jet booster unit employs independent heat dissipation devices 44 and 45, or as shown in the attached diagram. Figure 18 The circulating cooling channels between the jet-type booster devices share the heat dissipation device 47, which has the advantage of allowing the heat dissipation medium to reach the highest pressure, reducing the circulating heat dissipation flow and improving the heat dissipation effect. The advantage of the multi-stage series jet-type booster device method is that the heating devices 49, 40, and 42 form a heating and reheating cycle, which helps to improve efficiency.

[0072] (7) The system adopts the above method. Generally, a booster pump 33 can be connected in series in the circulation channel, or a booster pump 33 can be connected in series in the circulation channel and a check valve is connected in parallel between the inlet and outlet of the booster pump for starting power and stable operation.

[0073] Implementation method 6, as shown in the appendix Figure 20 The heat repressurization system shown has a circulating cooling channel 54 leading out of the outlet channel of the external heat exhaust device 53, and another branch channel connecting to the inlet of the expansion working device 57. The outlet of the compressor 55 driven by the expansion working device 57 is connected to the inlet nozzle of the jet-type pressurization device 51, and a heating device 50 is connected between them to form a heat pump circulation system. The external heat exhaust device 53 outputs a heat source, or the working fluid at the outlet of the expansion working device 57 provides a cold source. The following heating methods can be used:

[0074] (1) The heating device uses a heat exchanger that is heated by a boiler or other heat sources such as waste heat;

[0075] (2) As attached Figure 21 The heating device uses combustion chamber 581. A typical combustion chamber system includes a combustion chamber and a fuel supply device, etc.

[0076] (3) The heating device uses a heat exchanger or combustion system, and the system adds a regenerative heating device 59 (including a heat source side 592 and a heat absorption side 591; the dashed arrow indicates that the heat transfer direction is independent of the structure).

[0077] The advantage of this method is that it uses the expansion work of the low-temperature compressed working fluid as power to generate the initial pressure, and then uses the jet-type pressure boosting device to achieve the highest working pressure.

[0078] Implementation method 7, as shown in the appendix Figure 22 The gas-fired power system shown comprises a combustion chamber 61 that serves as a re-combustion chamber integrated with compound nozzles 62 (including 621-627) and an injection-type repressurization device, providing high-temperature, high-pressure flue gas. The outlet of the compound nozzles is connected to the inlet of the expansion power device or provides injection power externally. Similar to the aforementioned appendix, this system also includes... Figure 18The thermal repressurization subsystem can be considered as a subsystem that provides compressed air to the gas power process. The inlet of the primary injection booster 49 has an air passage that connects to the atmosphere, and a heater 66 is arranged on the air passage. A branch passage 65 is added to the outlet passage of the secondary injection booster 41 to provide compressed air to the combustion chamber 61 of the gas power process. The heating device 66 and the reheating device 67 are arranged in the flue of the gas power process (in the figure, the regenerative heating devices 66, 67 and 64 are arranged in the flue gas recirculation passage, and the regenerative device 64 and the exhaust device 63 together meet the requirements of circulating exhaust heat). If there is a high temperature difference, a regenerative heating device 60 can also be added to the compressed air passage 65 to improve efficiency.

[0079] Implementation method 8, as shown in the appendix Figure 23 The combustion chamber shown adopts the structure of an injection booster device. Compressed air or oxidizing fuel enters the interior through the inlet nozzle 581, and reducing fuel enters the interior through the fuel passage connected to the heat-absorbing medium nozzle 582. The ignition point or ignition device terminal 586 is arranged in the diffuser channel of the injection booster device or in the outlet channel of the diffuser channel.

[0080] Specific application methods can be found in the appendix. Figure 21 The injection-type pressurization device for the combustion chamber in the gas power system shown is a compound nozzle 58 (including 581 to 586), which consists of a first-stage nozzle 581, an intermediate-stage nozzle 583, and a final-stage nozzle 584. It can be regarded as a combination of the combustion chamber and the injection-type repressurization device. Compressed air is provided to the combustion chamber through nozzle 581, and reducing fuel is provided by fuel passage 582 and enters the intermediate-stage nozzle 583 through the heat-absorbing medium nozzle. The recirculation passage 585 is led out from the outlet passage of the external heat exhaust device to provide low-temperature compressed flue gas to the final-stage nozzle 584. Here, the reducing fuel and low-temperature compressed flue gas act as heat-absorbing mediums, so that the hot flue gas inside the compound nozzle is cooled down. Therefore, the combustion chamber using the injection-type pressurization device has the advantage of repressurization before combustion.

[0081] Implementation method 9, as shown in the appendix Figure 22 As shown, in a gas-powered system, the combustion chamber outlet is connected to an injection booster. The combustion chamber outlet nozzle is the first-stage nozzle of the injection booster, and a fuel passage is added to the second-stage nozzle of the injection booster to form a reburning chamber. The fuel passage includes an oxidizing fuel passage connecting compressed air or oxidizing fuel and a reducing fuel passage connecting reducing fuel. Specifically, one of the following structures can be adopted:

[0082] (1) As attached Figure 22The gas-powered system shown has a combustion chamber 61 connected to a jet-type pressurization device, namely a compound nozzle 62 (including 621 to 627). The inlet nozzle of the compound nozzle, namely the pre-stage or first-stage nozzle 621, is the outlet nozzle of the combustion chamber 61. The second-stage nozzle 623 adds a re-combustion chamber by connecting a low-temperature compressed air oxidizing fuel 622 and a reducing fuel channel 624. The final-stage nozzle 625 adds a heat-absorbing medium channel 626, which is connected to a branch channel of its outlet channel to form a recirculation channel. A heat recovery device 64 and a heat exhaust device 63 are connected to the recirculation channel to cool down the gas, so that the low-temperature compressed flue gas is used as the heat-absorbing medium of the compound nozzle.

[0083] The front and rear positions of the two fuel channels can be interchanged. As shown in the figure, the recombustion chamber of the compound nozzle 62 is connected to the oxidizing fuel channel in front of the diffuser channel, and the recombustion chamber connected to the reducing fuel channel is located in the outlet channel of the diffuser channel or in front of the outlet channel. Compressed air or oxidizing fuel is the coolant. Alternatively, the recombustion chamber is connected to the reducing fuel channel in front of the diffuser channel, and the recombustion chamber connected to the oxidizing fuel channel is located in the outlet channel of the diffuser channel or in front of the outlet channel. The reducing fuel is the coolant. In this way, the injection booster device is both a recombustion chamber and a repressurization process.

[0084] (2) As attached Figure 24 The injection-type repressurization device shown for use in the recombustion chamber employs two injection-type repressurization devices 71 and 75. Their inlet nozzles, i.e., the first-stage or pre-stage nozzles, are connected to the outlets of combustion chambers 72 and 73, respectively. One injection-type repressurization device has its diffuser channel connected to an oxidizing fuel channel 70, while the other injection-type repressurization device has its diffuser channel connected to a reducing fuel channel 74. The outlets of the diffuser channels of the two injection-type repressurization devices are merged into a single channel to form the recombustion chamber 76. (The last sentence appears to be incomplete and possibly refers to an appendix.) Figure 23 In the reburning chamber shown, only one of the oxidizing fuel and reducing fuel can be used as the refrigerant, compared to the previous method. Figure 24 The advantage shown is that it allows both fuels to act as coolants simultaneously, maximizing the repressurization effect.

[0085] (3) As attached Figure 25 The injection-type repressurization device shown can be used in the reburning chamber, and is attached to... Figure 24 Based on the existing technology, it has been upgraded to a two-stage re-combustion jet-type repressurization device composed of three nozzles, which can achieve secondary repressurization and secondary re-combustion, making the system more thermally efficient.

[0086] (4) As attached Figure 26 The injection-type repressurization device shown can be used in the reburning chamber and is corresponding to the attached... Figure 24A jet-type repressurization device that can be used in a recombustion chamber replaces the compound nozzle with a conventional injector with a diffuser tube. The outlet nozzles of combustion chambers 77 and 80 are the inlet nozzles of the jet-type repressurization device 78 and 81, respectively. The diffuser tubes of the two are connected to the oxidizing fuel passage 79 and the reducing fuel passage 82, respectively. The outlets of the two diffuser tubes are merged into a single passage 83 to form a recombustion chamber. Like a conventional combustion chamber, the outlet is generally equipped with a nozzle 84.

[0087] Similarly, the jet-type pressurization device can be not only a compound nozzle, but also includes all fluid machinery with jetting and diffusion processes, such as traditional jet ejectors with diffusers, traditional jet ejectors, and jet splitters.

[0088] Implementation method 10, as shown in the appendix Figure 27 and 28 The flue gas passage terminal of the thermal repressurization gas power system shown is equipped with an injection splitter 68 for external heating or cooling. The combustion chamber outlet passage or the end flue of the gas power process is connected to the inlet nozzle of the injection splitter. The curved inner passage of the injection splitter provides a heat source to the outside through the heat exhaust device 69, or the curved outer passage of the injection splitter provides a cold source to the outside. To increase the heat pump effect, a water supply passage 68a is generally added to enhance the evaporation and heat / cold separation effect. Figure 27 and 28 The difference shown is that the regenerator 64 and the exhaust device 63 are located in different positions in the flue. The latter makes the temperature of the flue gas at the inlet of the jet distributor lower and can be selected according to the actual heating temperature requirements.

[0089] This invention is a fundamental innovation, and the specific solutions are not limited to the scope of the above embodiments.

Claims

1. A compound nozzle, belonging to the field of fluid power machinery, can be used, but is not limited to, adding heat dissipation and cooling measures during the expansion and deceleration diffusion process of hot fluids through the nozzle, so that the expansion work of the hot fluid is greater than the compression work, thereby achieving thermodynamic conversion and increasing power. Its characteristics are: Two-stage or multi-stage nozzles are arranged sequentially in the direction of fluid flow to form a compound pressure boosting nozzle. The outlet of the first-stage nozzle is connected to the inlet of the second-stage nozzle. Each intermediate-stage nozzle is both the pre-stage nozzle of its second-stage nozzle and the second-stage nozzle of its pre-stage nozzle. The first-stage or intermediate-stage nozzles adopt a tapered and expanded structure, and the final-stage nozzle adopts a tapered and expanded structure or a tapered structure.

2. A compound nozzle as described in claim 1, characterized in that: The structure or heat dissipation and cooling measures of the compound nozzle adopt one or more of the following specific methods. (1) Added heat-absorbing medium channels to introduce heat-absorbing medium into the downstream nozzle or the flow channel between the two nozzles respectively. (2) The compound nozzle adopts a bent tube type jet splitter structure. The inlet nozzle of the jet splitter is the front nozzle, the outer splitting channel of the bent tube with the scaling splitting structure is the rear nozzle, and the inner splitting channel is the heat dissipation channel. (3) A recirculation channel is led out from the outlet channel of the rear or final stage of the compound nozzle and connected to the heat absorption medium channel of the compound nozzle, or a branch diffuser is led out from the throat of the rear or final stage of the compound nozzle. The outlet of the branch diffuser is connected to the heat absorption medium channel of the compound nozzle by a recirculation channel. A heat exhaust device is added to the recirculation channel. (4) The inlet of the rear nozzle of the compound nozzle has two or more tapered channels that are connected to the outlet of two or more front nozzles. The two or more tapered channels of the rear nozzle merge into one channel at the end, and a heat-absorbing medium channel is added to introduce different heat-absorbing media into the inlet channel or tapered channel of the two rear nozzles respectively. (5) The outlet of the pre-stage nozzle is directly connected to the inlet channel of the post-stage nozzle; or the outlet of the pre-stage nozzle is arranged in the inlet channel of the post-stage nozzle. (6) The pre-stage nozzle uses two or more nozzles arranged in parallel; (7) The pre-stage nozzle and the external exhaust nozzle are arranged side by side; (8) The ratio of the minimum flow area of ​​the downstream nozzle to the outlet flow area of ​​the upstream nozzle is less than 0.9; (9) The inlet channel of the post-stage nozzle or the post-stage nozzle has been expanded to connect to the low-pressure device, or to connect to the vacuum pumping equipment, or to connect to the atmospheric environment. (10) The compound nozzle uses at least one of the pre-stage nozzle and the post-stage nozzle as a ring structure or a structure in which multiple nozzles are distributed in a ring. (11) The compound nozzle adopts two or more parallel connection methods, and the number of compound nozzles connected is increased by the inlet valve to control the conduction of the compound nozzle.

3. A repressurization thermodynamic system, belonging to the field of thermal power or fluid power machinery, utilizes the addition of a heat-absorbing medium or heat-dissipating measures during the deceleration and diffusion process of a hot fluid after it expands through a nozzle, so that the expansion work of the hot fluid is greater than the compression work, thereby achieving thermodynamic conversion and increasing power. Its characteristics are: The thermal system employs a compound nozzle, which incorporates heat dissipation and cooling measures for the internal hot fluid. Furthermore, the compound nozzle utilizes one or more of the following specific methods to achieve the repressurization process. (1) The thermal system is a gas-fired power system, and its combustion chamber outlet nozzle adopts a compound nozzle; (2) The thermal system is a gas power system, in which a compound nozzle structure is used between the two turbines of its gas turbine or between the turbine stages; (3) The thermal system is a gas power system. In the modification of its gas turbine, the first stage blade or a certain stage blade is removed, or two or more stages of blades are removed in a discontinuous manner. A heat-absorbing medium channel is added between the nozzles before and after the removed blades to form a compound pressure boosting nozzle structure. (4) The thermal system is a gas power system or an internal combustion engine, whose exhaust passage is connected to a compound nozzle, which directly generates jet power or the outlet of the compound nozzle is connected to an expansion power device. (5) The thermal system is a steam thermal cycle, and there are compound nozzles connected in the passage from the feedwater pump to the steam turbine; (6) The power unit provides the heat-absorbing medium to the compound nozzle through the heat-absorbing medium channel. The heat-absorbing medium is an easily evaporable liquid or a low-temperature compressed gas; or the heat-absorbing medium channel of the compound nozzle is branched out from the low-temperature working medium channel inside the thermal system to provide the heat-absorbing medium to the compound nozzle.

4. A thermodynamic repressurization system, belonging to the field of thermal power or fluid power machinery, wherein the thermodynamic injection system utilizes the expansion of a hot fluid through a nozzle, followed by the addition of a heat-absorbing medium or heat-dissipating measures during the deceleration and diffusion process, to make the expansion work of the hot fluid greater than the compression work, thereby achieving thermodynamic conversion and increasing power. Its characteristics are: The thermal injection system employs a jet-type pressurization device, which includes, but is not limited to, an inlet nozzle and a deceleration and diffusion channel. The hot fluid enters the interior of the jet-type pressurization device through the inlet nozzle, and after gradual converging and diffusion, it is discharged from the outlet. A circulating cooling channel is connected between the outlet channel of the jet-type pressurization device or its branch channel and the inlet nozzle of its cooling medium. A heat dissipation device is connected to the circulating cooling channel, forming a circulating cooling thermal repressurization system.

5. The thermal repressurization system as described in claim 4, characterized in that: The system's structure or loop method employs one of the following: (1) The inlet nozzle of the jet-type booster device is connected to the compressor outlet channel; (2) The inlet channel of the jet booster device draws in a low-temperature gas source from the outside and a heating device is arranged on the hot fluid channel. A branch channel was added to the outlet channel to provide compressed air to the outside or connect to the expansion and power device; (3) The thermal boosting system adopts a closed thermal circulation method. The outlet channel of the heat exhaust device is connected to the jet distributor. The curved outer channel of the jet distributor is connected to the cooling nozzle of the jet boosting device. The curved inner channel of the jet distributor is connected to the inlet nozzle of the jet boosting device, and a heating device is arranged on the connecting channel. The system is used for heat pumps, where the heat exhaust device provides a heat source to the outside, or a heat absorption device is added to the outlet channel on the outside of the bend of the jet distributor to provide a cold source to the outside; or the system is used for external work, where an expansion work device is connected in the channel between the outlet of the jet booster device and the inlet of the heat exhaust device; or the system is equipped with both the heat absorption device and the expansion work device. (4) A circulating heating channel is added between the outlet channel and the inlet nozzle of the jet booster device, and a heating device is arranged on the circulating heating channel; the jet booster device adds an inlet channel to the inlet side to draw in the working medium, and adds a branch channel to the outlet channel to provide compressed air source or connect to the expansion power device. (5) A circulating heating channel is added between the outlet channel and the inlet nozzle of the jet booster device, and a heating device is arranged on the circulating heating channel; the jet booster device adds an inlet channel on the inlet side to draw in the working fluid; the outlet channel of the heat exhaust device is connected to the jet distributor, the curved outer channel of the jet distributor is connected to the cooling nozzle of the jet booster device, and the curved inner channel of the jet distributor exhausts to the outside or is connected to the added inlet channel of the jet booster device; The system is used for a heat pump, wherein the heat dissipation device provides a heat source to the outside, or a heat absorption device is added to the outlet channel on the outside of the bend of the jet splitter to provide a cold source to the outside; or a branch channel is added to the outlet channel of the jet booster to provide a compressed air source to the outside. Alternatively, the system may be equipped with both the aforementioned heat absorption device and a branch channel that provides compressed air to the outside. (6) The jet booster device is a primary booster device, and one or more re-boosting jet booster devices are connected in series in its outlet channel. Each jet booster device adopts an independent heat dissipation device, or the circulating cooling channel between the jet booster devices shares the heat dissipation device. (7) The system adopts one of the above six methods, and a booster pump is connected in series in the circulation channel, or a booster pump is connected in series in the circulation channel and a check valve is connected in parallel between the inlet and outlet of the booster pump.

6. The thermal repressurization system as described in claim 4, characterized in that: The outlet channel of the aforementioned heat exhaust device branches off and connects to the inlet of the expansion working device. The outlet of the compressor driven by the expansion working device is connected to the inlet nozzle of the jet-type booster device, and a heating device is connected between the two to form a heat pump circulation system. The heat exhaust device outputs a heat source to the outside, or the working fluid at the outlet of the expansion working device provides a cold source to the outside. One of the following heating methods is employed. (1) The heating device uses a heat exchanger; (2) The heating device uses a combustion chamber system; (3) The heating device uses a heat exchanger or combustion system, and the system has added a regenerative heating device.

7. A thermal repressurization system as described in claim 4, characterized in that: The thermal repressurization system is a subsystem that provides compressed air in the gas power system. The inlet of the jet-type pressurization device of the thermal repressurization system has an air passage that connects to the atmosphere, and a branch passage is added to the outlet passage to provide compressed air to the combustion chamber of the gas power system. The heating device is arranged in the flue of the gas power process.

8. A thermal repressurization system as described in claim 3, 6, or 7, characterized in that: The combustion chamber adopts the structure of an injection booster device. Compressed air or oxidizing fuel enters the interior through the inlet nozzle of the injection booster device, while reducing fuel enters the interior through the fuel channel connected to another inlet nozzle of the injection booster device. The ignition point is arranged in the diffuser channel or the outlet channel of the diffuser channel of the injection booster device.

9. A thermal repressurization system as described in claim 3, 6, or 7, characterized in that: The combustion chamber outlet is connected to an injection booster device. The combustion chamber outlet nozzle is the inlet nozzle of the injection booster device. The diffuser channel of the injection booster device connects to the fuel passage to form a reburning chamber. The fuel passage includes an oxidizing fuel passage connecting compressed air or oxidizing fuel and a reducing fuel passage connecting reducing fuel, and adopts one of the following structures. (1) The reburning chamber is connected to the oxidizing fuel passage in front of the diffuser passage, and the reburning chamber is connected to the reducing fuel passage in the outlet passage of the diffuser passage or in front of the outlet passage; or, the reburning chamber is connected to the reducing fuel passage in front of the diffuser passage, and the reburning chamber is connected to the oxidizing fuel passage in the outlet passage of the diffuser passage or in front of the outlet passage. (2) Two types of injection booster devices are adopted, with their inlet nozzles connected to the combustion chamber outlet respectively. The diffuser channel of one injection booster device is connected to the oxidizing fuel channel, and the diffuser channel of the other injection booster device is connected to the reducing fuel channel. The outlets of the diffuser channels of the two injection booster devices are merged into one channel to form a reburning chamber.

10. A thermal repressurization system as described in claim 7, characterized in that: The combustion chamber outlet passage or the end flue of the gas power process is connected to the inlet nozzle of the injection splitter. The curved inner passage of the injection splitter provides a heat source to the outside, or the curved outer passage of the injection splitter provides a cold source to the outside.

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