Energy-saving device of direct-fired unit

Abstract

The utility model discloses an energy-saving device of a direct-fired unit. The energy-saving device comprises a skid-mounted rack, a high-temperature generator is arranged on the skid-mounted rack, a combustor is arranged on the high-temperature generator, a combustion pipeline is arranged on the high-temperature generator, and an exhaust shell is arranged at the tail end of the combustion pipeline. The utility model relates to the technical field of energy-saving devices, in particular to an energy-saving device of a direct-fired unit, which has the energy-saving characteristics that residual kinetic energy of waste gas exhausted after combustion is utilized to drive heat recovery circulation, extra electric power is not needed to drive a circulating pump in a heat exchange process, and the kinetic energy of the originally abandoned waste gas is skillfully utilized to drive the whole waste heat recovery circulation system. After the main heating task of the waste gas is completed, residual heat of the waste gas is recycled, residual kinetic energy of the waste gas is utilized, gradient utilization of energy is achieved, and the overall energy utilization efficiency of the direct-fired unit is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving device technology, specifically an energy-saving device for a direct-fired power unit. Background Technology

[0002] A direct-fired gas turbine is a machine that uses the direct combustion of combustible gas to provide cooling, heating, and domestic hot water. Direct-fired units are mainly skid-mounted and integrate multiple functional devices such as a high-temperature generator, a low-temperature generator, a direct-fired engine, a heat exchanger, an evaporator, and a condenser.

[0003] In application, the high-temperature gas generated by the direct-fired engine heats and evaporates the solution in the high-temperature generator. Then, the steam generated by the high-temperature generator heats the solution in the low-temperature generator. The low-temperature generator, evaporator, and condenser form a heat exchange device. During operation, in order to ensure that the heat generated by combustion is fully utilized, an insulation shell is often installed around the burner and the high-temperature generator. However, the hot gas generated by the direct-fired unit is often directly discharged after heating the high-temperature generator, without being effectively utilized. This not only wastes energy but also pollutes the environment. In view of this, this case was developed through in-depth research on the above problems. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides an energy-saving device for direct-fired power units, which solves the existing background technology problems.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an energy-saving device for a direct-fired unit, including a skid-mounted frame, a high-temperature generator installed on the skid-mounted frame, a burner installed on the high-temperature generator, a combustion pipeline installed on the high-temperature generator, and an exhaust shell installed at the end of the combustion pipeline;

[0006] The exhaust casing is a rectangular channel with a rectangular structure. A direct-vent heat exchanger is installed inside the exhaust casing. The direct-vent heat exchanger is provided with an inlet and an outlet. A pair of circulation pipes are connected to the inlet and the outlet respectively. A heat recovery storage device is connected to one side of the pair of circulation pipes.

[0007] The heat recovery storage device includes a working fluid storage tank connected to a pair of circulation pipes. A circulation pump casing is connected to one side of the working fluid storage tank. A circulation impeller is installed inside the circulation pump casing, and the central shaft of the circulation impeller passes through the circulation pump casing. A synchronous impeller is installed on the exhaust casing, and the central shaft of the synchronous impeller and the central shaft of the circulation impeller are connected by a coupling controller.

[0008] Preferably, the exhaust housing and the end of the combustion pipe are connected separately by at least two pairs of screws.

[0009] Preferably, the working fluid storage tank is equipped with a temperature display, and the shell of the working fluid storage tank is provided with a sandwich layer, and the sandwich layer is provided with heat insulation cotton.

[0010] Preferably, the direct-vent heat exchanger includes a distributor, which is installed on the exhaust shell. A plurality of heat exchange tubes are evenly distributed on the distributor, and the other end of the plurality of heat exchange tubes is connected to a reflux device. The reflux device and the distributor are respectively connected to a pair of circulation tubes.

[0011] Preferably, the coupling controller includes a support base, which is installed on one side of the circulating pump casing. A gear set is provided on the support base, and a pair of connecting shafts are respectively provided at the input end and the output end of the gear set. The pair of connecting shafts are respectively connected to the central shaft of the synchronous impeller and the central shaft of the circulating impeller through flanges.

[0012] Beneficial effects

[0013] This utility model provides an energy-saving device for a direct-fired power unit. It offers the following advantages: The energy-saving feature of this device lies in utilizing the residual kinetic energy of the exhaust gas after combustion to drive a heat recovery cycle. The heat exchange process requires no additional electricity to drive the circulation pump. It cleverly utilizes the kinetic energy of the originally wasted exhaust gas to drive the entire waste heat recovery cycle system, enabling the residual heat of the exhaust gas to be recovered and its residual kinetic energy utilized after completing the main heating task. This achieves cascaded energy utilization and significantly improves the overall energy efficiency of the direct-fired power unit. Attached Figure Description

[0014] Figure 1 This is a first three-dimensional structural schematic diagram of an energy-saving device for a direct-fired power unit according to the present invention.

[0015] Figure 2 This is a second three-dimensional structural diagram of an energy-saving device for a direct-fired power unit according to the present invention.

[0016] Figure 3 This is a third three-dimensional structural diagram of the energy-saving device for a direct-fired power unit according to the present invention.

[0017] Figure 4 This is a fourth three-dimensional structural diagram of the energy-saving device for a direct-fired power unit according to the present invention.

[0018] In the diagram: 1. Skid-mounted frame; 2. High-temperature generator; 3. Burner; 4. Exhaust casing; 5. Heat recovery storage tank; 6. Direct-vent heat exchanger; 7. Circulation pipe; 51. Working fluid storage tank; 52. Circulation pump casing; 53. Circulation impeller; 54. Synchronous impeller; 55. Shaft-connected controller; 56. Temperature display; 61. Flow divider; 62. Heat exchange tube; 63. Return flow device; 551. Support base; 552. Gear set; 553. Connecting shaft. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides an implementation scheme: In the application of modern direct-fired units, the high-temperature generator 2 of the direct-fired unit is connected to the burner 3. The high-temperature gas generated by the burner 3 heats the solvent in the high-temperature generator 2 and is often discharged directly. However, in actual application, when the high-temperature gas of the burner 3 is discharged after heating, a lot of heat remains. This part of the heat is usually not high in temperature, but it can still be used as a heat preservation medium, so it needs to be reused.

[0021] To address the aforementioned issues, this application discloses an energy-saving device for a direct-fired power unit, comprising a skid-mounted frame 1 serving as an overall support and integrated platform, a core heating component high-temperature generator 2 mounted on the skid-mounted frame 1, a burner 3 for generating high-temperature gas mounted on the high-temperature generator 2, a combustion pipeline for guiding the flow of post-combustion gas mounted on the high-temperature generator 2, and an exhaust housing 4, a terminal structure for collecting and treating exhaust gas, mounted at the end of the combustion pipeline.

[0022] According to the instruction manual Figure 1-4 It can be seen that the exhaust shell 4 is designed as a rectangular channel with a rectangular structure that facilitates uniform airflow distribution. The exhaust shell 4 is equipped with a core waste heat recovery component, a direct-vent heat exchanger 6. The direct-vent heat exchanger 6 uses the waste heat of the exhaust gas to heat the circulating working fluid. It is equipped with an inlet and an outlet. A pair of circulation pipes 7 that form a working fluid circulation loop are connected to the inlet and outlet respectively. A heat recovery storage device 5 that stores the heated working fluid and drives its circulation is connected to one side of the pair of circulation pipes 7.

[0023] According to the instruction manual Figure 1-4It is understood that the above-mentioned heat recovery storage device includes a working fluid storage tank 51 for storing heat transfer fluid such as water or heat transfer oil. The working fluid storage tank 51 is connected to a pair of circulation pipes 7 to form a complete circulation loop. A circulation pump casing 52 that houses the circulation drive component is connected to one side of the working fluid storage tank 51. A core impeller circulation impeller 53 that drives the working fluid to flow in the loop is installed inside the circulation pump casing 52. The central shaft of the circulation impeller 53 passes through the circulation pump casing 52. A key power conversion component synchronous impeller 54 is installed on the exhaust casing 4. The synchronous impeller 54 is installed in the airflow channel inside the exhaust casing 4 and rotates directly under the impact of the exhaust gas flow. The central shaft of the synchronous impeller 54 and the central shaft of the circulation impeller 53 are connected through a coupling controller 55 to realize the transfer of exhaust gas kinetic energy to circulation power.

[0024] Working process: The waste gas generated and heated by the burner 3 enters the exhaust shell 4 through the combustion pipeline. The waste gas flow impacts the synchronous impeller 54, causing it to rotate. The rotational kinetic energy of the synchronous impeller 54 is output through its extended central shaft and directly transmitted to the circulating impeller 53 in the circulating pump shell 52 via the coupling controller 55, driving it to rotate synchronously. The rotation of the circulating impeller 53 generates power, driving the heat transfer medium in the working medium storage tank 51 to flow through the direct-vent heat exchanger 6. At this time, when the working medium flows through the heat exchange tube 62 in the exhaust shell 4, it exchanges heat with the waste gas that still has a certain temperature. The residual heat in the waste gas is absorbed by the working medium, realizing waste heat recovery. The heated working medium flows back to the working medium storage tank 51 to store heat, which can be supplied to the low-temperature generator as a heat source for insulation.

[0025] As a preferred option, the exhaust housing 4 is further connected to the end of the combustion pipe by at least two pairs of screws, which facilitates the installation, maintenance and replacement of internal components such as heat exchangers or synchronous impellers 54.

[0026] As a preferred option, the working fluid storage tank 51 is further equipped with a temperature display 56 for real-time monitoring of the working fluid temperature, and the shell of the working fluid storage tank 51 is provided with a sandwich layer, and the sandwich layer is provided with heat insulation cotton to reduce the heat loss of the working fluid.

[0027] As a preferred embodiment, the direct-vent heat exchanger 6 further includes a distributor 61 installed on the exhaust shell 4. The distributor 61 has several heat exchange tubes 62 evenly distributed on it to increase the heat exchange area. The other end of the heat exchange tubes 62 is connected to a return valve 63. The return valve 63 and the distributor 61 are respectively connected to a pair of circulation pipes 7 to form a complete working fluid flow channel. The working fluid is diverted into the heat exchange tubes 62 through the distributor 61, and then comes into contact with the exhaust gas through the heat exchange tubes 62. The exhaust gas flows through the heat exchange tubes 62 to achieve heat exchange of the working fluid and return it to the working fluid storage tank 51 through the return valve 63.

[0028] As a preferred embodiment, the coupling controller 55 further includes a support base 551 that provides stable support. The support base 551 is installed on one side of the circulating pump housing 52. A gear set 552 is provided on the support base 551 to achieve speed matching and power transmission. A pair of connecting shafts 553 are respectively provided at the input and output ends of the gear set 552. The support base 551 is used to install the gear set 552. The pair of connecting shafts 553 are respectively connected to the central shaft of the synchronous impeller 54 and the central shaft of the circulating impeller 53 through flanges that ensure coaxiality and reliable connection. When the synchronous impeller 54 rotates under the impact of exhaust gas, the output torque is amplified by the gear set 552 to drive the circulating impeller 53 to work, thereby causing the circulating impeller 53 to rotate inside the circulating pump housing 52, and thus driving the working fluid.

[0029] In summary, the energy-saving feature of this direct-fired unit lies in its use of the residual kinetic energy of the exhaust gas after combustion to drive a heat recovery cycle. The heat exchange process does not require additional electricity to drive the circulation pump. It cleverly utilizes the kinetic energy of the originally discarded exhaust gas to drive the entire waste heat recovery cycle system, so that after the exhaust gas completes its main heating task, its residual heat is recovered and its residual kinetic energy is utilized, realizing the cascade utilization of energy and significantly improving the overall energy utilization efficiency of the direct-fired unit.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving device for a direct-fired power unit, comprising a skid-mounted frame (1), wherein a high-temperature generator (2) is mounted on the skid-mounted frame (1), and a burner (3) is mounted on the high-temperature generator (2), characterized in that, The high-temperature generator (2) is provided with a combustion pipe, and an exhaust shell (4) is provided at the end of the combustion pipe; The exhaust casing (4) is a rectangular channel with a rectangular structure. A direct-vent heat exchanger (6) is installed inside the exhaust casing (4). The direct-vent heat exchanger (6) is provided with an inlet and an outlet. A pair of circulation pipes (7) are connected to the inlet and the outlet respectively. A heat recovery storage device (5) is connected to one side of the pair of circulation pipes (7). The heat recovery storage device includes a working fluid storage tank (51), which is connected to a pair of circulation pipes (7). A circulation pump casing (52) is connected to one side of the working fluid storage tank (51). A circulation impeller (53) is provided inside the circulation pump casing (52). The central shaft of the circulation impeller (53) passes through the circulation pump casing (52). A synchronous impeller (54) is provided on the exhaust casing (4). The central shaft of the synchronous impeller (54) and the central shaft of the circulation impeller (53) are connected by a coupling controller (55).

2. The energy saving device of a direct combustion unit according to claim 1, characterized in that, The exhaust housing (4) is separately connected to the end of the combustion pipe by at least two pairs of screws.

3. The energy saving device of a direct combustion unit according to claim 2, characterized in that, The working medium storage tank (51) is equipped with a temperature display (56), and the shell of the working medium storage tank (51) is provided with a sandwich layer in the middle, and the sandwich layer is provided with heat insulation cotton.

4. The energy saving device of a direct combustion unit according to claim 3, characterized in that, The direct-flow heat exchanger (6) includes a distributor (61), which is installed on the exhaust shell (4). A plurality of heat exchange tubes (62) are evenly distributed on the distributor (61). The other end of the plurality of heat exchange tubes (62) is connected to a return pipe (63). The return pipe (63) and the distributor (61) are respectively connected to a pair of circulation pipes (7).

5. The energy saving device of a direct combustion unit according to claim 4, characterized in that, The coupling controller (55) includes a support base (551), which is installed on one side of the circulating pump casing (52). A gear set (552) is provided on the support base (551). A pair of connecting shafts (553) are respectively provided at the input end and the output end of the gear set (552). The pair of connecting shafts (553) are respectively connected to the central shaft of the synchronous impeller (54) and the central shaft of the circulating impeller (53) through flanges.

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