Movable diesel engine waste heat recovery and energy storage module and method

Abstract

The invention discloses a movable diesel engine waste heat recovery and energy storage module and method. The movable diesel engine waste heat recovery and energy storage module comprises a left shell pass cover plate, a flue gas inlet, a left side shell, a right shell pass cover plate, a flue gas outlet, a right side shell, heat storage balls, a heat storage body supporting plate and a porous grating. The left shell pass cover plate is located on the left side of the left shell, the smoke outlet is located in the middle of the lower end of the left shell pass cover plate, the right shell pass cover plate is located on the right side of the right shell, and the smoke outlet is located in the middle of the lower end of the right shell pass cover plate. The middle of the upper end of the left side of the right side shell is connected with the right side quick connector, the heat accumulator supporting plates are sequentially arranged in the left side shell and the right side shell from bottom to top at equal intervals, and the left side porous grating and the right side porous grating are arranged at the lower end in the left side shell and the upper end in the right side shell correspondingly. According to the design, the tail gas waste heat of the diesel engine is recycled and stored through the movable modular design, the recycled heat can be adjusted according to the tail end requirement and reused, and energy is saved. The device is suitable for industrial waste heat recovery of diesel engines, boilers and the like.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery, specifically to a mobile diesel engine waste heat recovery and energy storage module and method. Background Technology

[0002] Energy efficiency and sustainable development have become critical issues in today's society. The storage and recovery of heat energy from industrial waste heat sources is of great significance for promoting energy conservation and emission reduction. In particular, recovering waste heat from exhaust gases or flue gas is crucial for improving system energy efficiency. On the one hand, only 30%-40% of the combustion energy of a diesel engine is converted into useful mechanical work during operation; the vast majority of energy is carried away by cooling water and exhaust gas, ultimately dissipating into the environment. In high-altitude environments, the thin atmosphere and low air pressure reduce the intake efficiency of diesel engines, leading to decreased performance and increased exhaust emissions. On the other hand, the intermittent and unstable nature of diesel engine exhaust makes direct utilization of waste heat difficult. Therefore, it is necessary to recover and utilize waste heat from diesel engines to alleviate energy supply problems and improve energy utilization efficiency.

[0003] Previous waste heat recovery technologies were mostly used to match the time and space of supply and demand. However, diesel generators often operate intermittently, with waste heat concentrated in a specific time period. If the demand for waste heat utilization is more widespread, it is necessary to achieve staggered recovery and utilization of waste heat between the supply and demand sides. Patent application number 201410158184.4, "A Waste Heat Recovery Device for Marine Diesel Engine Exhaust Gas," proposes a waste heat recovery device for marine diesel engine exhaust gas. Although the heat exchanger fully recovers energy from the diesel engine exhaust gas, the recovered energy is only utilized during operation and cannot achieve temporal transfer of energy. Furthermore, the fluctuation of diesel engine exhaust gas affects the quality of the recoverable energy. While the patent application No. 202010464379.7, titled "A Waste Heat Recovery System for Offshore Drilling Platform Diesel Engines with Heat Storage Function," achieves tiered utilization of diesel engine waste heat recovery through a heat storage device, heating water into steam for delivery to gas-using equipment, the heat storage device only serves as an auxiliary heat source and cannot achieve energy transfer over time. Furthermore, while packed beds, commonly used in waste heat recovery, offer advantages such as good heat exchange and compact structure, direct packing results in low porosity and significant pressure drop. Direct connection to the diesel engine exhaust pipe increases exhaust resistance, affecting not only the overall performance of the diesel generator but also potentially posing safety risks. Therefore, to efficiently recover and utilize intermittent diesel engine exhaust heat within a limited space, ensuring stable end-point heating and achieving energy conservation, environmental protection, and energy regeneration, it is necessary to design a compact, easily transportable diesel generator waste heat recovery energy storage module to address the problems of intermittent industrial heat generation and energy shortages. This device is portable and mobile, enabling modular assembly. Summary of the Invention

[0004] The purpose of this invention is to provide a mobile diesel engine waste heat recovery and energy storage module and method to solve the problems of intermittent industrial waste heat generation and space limitations of waste heat recovery devices mentioned in the background art, so as to achieve efficient recovery and storage of industrial waste heat in a limited space.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mobile diesel engine waste heat recovery and energy storage module and method, comprising: a left shell side cover plate, a flue gas inlet, a left shell, a right shell side cover plate, a flue gas outlet, a right shell, a heat storage ball, a heat storage body support plate, and a porous grid.

[0006] The left shell cover is located on the left side of the left shell, and the flue gas outlet is located at the lower middle of the left shell cover. The right shell cover is located on the right side of the right shell, and the flue gas outlet is located at the lower middle of the right shell cover. The upper middle of the right side of the left shell is connected to the left quick interface, and the upper middle of the left side of the right shell is connected to the right quick interface. The heat storage body support plates are arranged at equal intervals from bottom to top inside the left and right shells. The left porous grille and the right porous grille are respectively arranged at the lower end of the left shell and the upper end of the right shell.

[0007] Preferably, the mobile diesel engine waste heat recovery and energy storage module is characterized in that: the left side housing and the right side housing are connected via a left quick interface and a right quick interface.

[0008] Preferably, the mobile diesel engine waste heat recovery and energy storage module is characterized in that: the left shell cover plate and the right shell cover plate can be flexibly installed and removed by nuts.

[0009] Preferably, the mobile diesel engine waste heat recovery energy storage module is characterized in that: the heat storage body support plate is composed of grid-shaped ribs and support rings; the number and position of the heat storage body support plate can be adjusted as needed and arranged inside the left and right shells; the support rings are cylindrical with hollowed-out walls and can be arranged in an array on the grid-shaped ribs as needed.

[0010] Preferably, the mobile diesel engine waste heat recovery and energy storage module is characterized in that: the heat storage ball is located on the upper part of the support ring, and the heat storage ball is fixed by spot welding, and the heat storage ball is filled with phase change heat storage material as needed.

[0011] Preferably, the mobile diesel engine waste heat recovery and energy storage module is characterized in that: the left porous grille and the right porous grille are respectively arranged at the lower end of the left shell and the upper end of the right shell, and the interior of the porous grille presents a grid-shaped hollow.

[0012] Preferably, the mobile diesel engine waste heat recovery and energy storage module is characterized in that: the bottom of both the left and right housings is equipped with movable pulleys.

[0013] A method for using a mobile diesel engine waste heat recovery and energy storage module is characterized by the following steps: When recovering and storing waste heat from industrial flue gas, the flue gas sequentially passes through a flue gas inlet, a porous grille, a left-side shell, a left-side quick-connect interface, a right-side quick-connect interface, another porous grille, a right-side shell, and a flue gas outlet. As the flue gas passes through the left-side porous grille, it is evenly distributed into the shell, where the high-temperature flue gas exchanges heat with the heat storage balls. The phase change material in the heat storage balls performs phase change heat storage, thus realizing the recovery and storage of waste heat from the modular device. The heat storage material uses a medium-temperature nitrate series (LiNO3, NaNO3, etc.) phase change material suitable for industrial waste heat recovery. It has a high energy storage density, storing a large amount of latent heat while also storing a large amount of sensible heat. The phase change process is stable, maintaining stable thermal properties after multiple phase change cycles, making it suitable for long-term energy storage. When the device provides end-point heating, outdoor air follows the same path as the flue gas during waste heat recovery, and the cold air is heated by the heat storage balls, thereby achieving end-point heating.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the mobile diesel engine waste heat recovery and energy storage module device;

[0015] The device has a simple structure, consisting of only two highly integrated modules. One module comprises the shell-side cover, flue gas inlet, moving pulleys, left-side shell, left-side quick-connect interface, heat storage body support plate, perforated grid, and heat storage balls; the other module comprises the moving pulleys, right-side quick-connect interface, right-side shell, flue gas outlet, right-side shell-side cover, heat storage body support plate, perforated grid, and heat storage balls. The internal structure of each module is compact and highly reliable.

[0016] During operation, the energy storage module sequentially passes through the flue gas inlet, porous grid, left-side shell, heat storage ball, left-side quick-connect interface, right-side quick-connect interface, heat storage ball, porous grid, right-side shell, and flue gas outlet. The entire process relies solely on the phase change of the nitrate material within the heat storage ball to collect and store heat, ensuring heat collection while avoiding secondary pollution of the flue gas. The device allows for rapid assembly via quick-connect interfaces and the heat storage material can be arranged according to the end-user heating requirements, thus achieving modularity and portability.

[0017] The compact modular waste heat recovery and storage device of this invention can store industrial waste heat during off-peak periods, solving the problems of intermittent industrial heat generation, energy shortage, and space constraints. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the left and right module structures of the present invention;

[0019] The components are: 1. Flue gas inlet; 2. Left side cover plate; 3. Moving pulley; 4. Left side housing; 5. Left side quick connector; 6. Right side quick connector; 7. Right side housing; 8. Flue gas outlet; 9. Right side cover plate.

[0020] Figure 2 These are side and front sectional views of the left module of the present invention;

[0021] The components are: 2. Flue gas inlet; 3. Moving pulley; 4. Left side shell; 5. Left side quick interface; 10. Heat storage body support plate; 11. Perforated grid; 12. Heat storage ball.

[0022] Figure 3 These are side and front sectional views of the right module of the present invention;

[0023] The components are: 2. Flue gas inlet; 3. Moving pulley; 6. Right side quick interface; 7. Right side shell; 8. Flue gas outlet; 9. Right side cover plate; 10. Heat storage body support plate; 11. Perforated grid; 12. Heat storage ball.

[0024] Figure 4 This is a schematic diagram of the porous grid and heat storage body support plate structure of the present invention;

[0025] Among them: 10-1, support ring; 10-2, grid-shaped brambles; 11, perforated grid. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not the complete embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0027] Please see Figure 1-4This invention provides a technical solution: a mobile diesel engine waste heat recovery and energy storage module, comprising: a left shell cover plate 1, a flue gas inlet 2, a left shell 4, a right shell cover plate 9, a flue gas outlet 8, a right shell 7, a heat storage ball 12, a heat storage body support plate 10, and a perforated grid 11. The left shell cover plate 1 is located to the left of the left shell 4, the flue gas outlet 2 is located at the lower middle of the left shell cover plate 1, the right shell cover plate 9 is located to the right of the right shell 7, the flue gas outlet 2 is located at the lower middle of the right shell cover plate 1, the upper middle of the right side of the left shell 4 is connected to a left quick interface 5, the upper middle of the left side of the right shell 7 is connected to a right quick interface 6, the heat storage body support plate 10 is arranged at equal intervals from bottom to top inside the left shell 4 and the right shell 7, and the left perforated grid 11-1 and the right perforated grid 11-2 are respectively arranged at the lower end of the left shell 4 and the upper end of the right shell 7.

[0028] The left housing 4 and the right housing 7 are connected by the left quick interface 5 and the right quick interface 6. The quick interface enables the two modules to be quickly spliced ​​together and provides a certain buffer area for the diversion of flue gas inside the housing, avoiding the occurrence of dead zones.

[0029] The left shell side cover plate 1 and the right shell side cover plate 9 can be flexibly installed and removed with nuts. Their function is to enable modular assembly and easy disassembly, which can realize the assembly and replacement of heat storage balls inside the shell.

[0030] The heat storage body support plate 10 is composed of grid-shaped ribs 10-2 and support rings 10-1. The number and position of the heat storage body support plate 10 can be adjusted as needed and arranged inside the left shell 4 and the right shell 7. Its function is to enhance the support of the heat storage body, ensure that it does not deform, and at the same time, to evenly distribute the flue gas and achieve efficient heat exchange. The support ring 10-1 is cylindrical with hollow walls. Its number and position can be adjusted as needed and arranged in an array on the grid-shaped ribs 10-2. Its function is to ensure that there are no dead zones in the flue gas between the heat storage ball and the support ring, which would increase the flow resistance of the flue gas and worsen the heat exchange effect.

[0031] The heat storage ball 12 is located on the upper part of the support ring 10-1 and is fixed by spot welding. According to the need for shock absorption, it can be ensured that the heat storage ball 12 does not shift during operation and transportation. The heat storage ball 12 is filled with phase change heat storage material as needed. Different phase change point temperature materials can be selected for filling and waste heat recovery according to different end heating needs.

[0032] The left-side perforated grille 11-1 and the right-side perforated grille 11-2 are respectively arranged at the lower end of the left-side shell 4 and the upper end of the right-side shell 7. The perforated grille 11 has a grid-shaped hollow inside to achieve the effect of equalizing the flow when the flue gas changes direction significantly.

[0033] Both the left side housing 4 and the right side housing 7 are equipped with casters 3 around their bottom edges to facilitate the movement and installation of the diesel engine energy storage module.

[0034] Working principle: When using this type of mobile diesel engine waste heat recovery energy storage module, firstly according to... Figure 1-4 As shown, this device can recover industrial flue gas, realizing the utilization and storage of waste heat from the flue gas. In recovering and storing waste heat from industrial flue gas, the flue gas first passes sequentially through the flue gas inlet, porous grille, left-side shell, left-side quick-connect interface, right-side quick-connect interface, porous grille again, right-side shell, and flue gas outlet. When the flue gas passes through the left-side porous grille, it is evenly distributed into the shell, where the high-temperature flue gas exchanges heat with the heat storage balls. The phase change material in the heat storage balls performs phase change heat storage, realizing the recovery and storage of waste heat in this modular device. When the device provides end-point heating, outdoor air follows the same path as the flue gas during waste heat recovery; the cold air is heated by the heat storage balls, thus achieving end-point heating.

Claims

1. A mobile diesel engine waste heat recovery and energy storage module and method, comprising: The left shell side cover plate (1), flue gas inlet (2), left side shell (4), right shell side cover plate (9), flue gas outlet (8), right side shell (7), heat storage ball (12), heat storage body support plate (10), and perforated grid (11) are characterized in that: the left shell side cover plate (1) is located on the left side of the left side shell (4), the flue gas outlet (2) is located at the lower middle part of the left shell side cover plate (1), the right shell side cover plate (9) is located on the right side of the right side shell (7), and the flue gas outlet (2) is located on the right side of the left side shell (7). The lower middle part of the shell cover plate (1), the upper middle part of the right side of the left shell (4) is connected to the left quick interface (5), the upper middle part of the left side of the right shell (7) is connected to the right quick interface (6), the heat storage body support plate (10) is arranged at equal intervals from bottom to top inside the left shell (4) and the right shell (7), the left porous grid (11-1) and the right porous grid (11-2) are respectively arranged at the lower end of the left shell (4) and the upper end of the right shell (7).

2. A mobile diesel engine waste heat recovery and energy storage module according to claim 1, characterized in that: The left housing (4) and the right housing (7) are connected via a left quick interface (5) and a right quick interface (6).

3. A mobile diesel engine waste heat recovery and energy storage module according to claim 1, characterized in that: The left shell side cover plate (1) and the right shell side cover plate (9) can be flexibly installed and removed using nuts.

4. A mobile diesel engine waste heat recovery and energy storage module according to claim 1, characterized in that: The heat storage body support plate (10) is composed of grid-shaped ribs (10-2) and support rings (10-1). The number and position of the heat storage body support plate (10) can be adjusted as needed and arranged inside the left shell (4) and the right shell (7). The support rings (10-1) are cylindrical with hollow walls and can be arranged in an array on the grid-shaped ribs (10-2) as needed.

5. A mobile diesel engine waste heat recovery and energy storage module according to claim 1, characterized in that: The heat storage ball (12) is located on the upper part of the support ring (10-1). The heat storage ball is fixed by spot welding. The heat storage ball (12) is filled with phase change heat storage material as needed.

6. A mobile diesel engine waste heat recovery and energy storage module according to claim 1, characterized in that: The left-side perforated grid (11-1) and the right-side perforated grid (11-2) are respectively arranged at the lower end of the left-side shell (4) and the upper end of the right-side shell (7), and the perforated grid (11) has a grid-shaped hollow inside.

7. A mobile diesel engine waste heat recovery and energy storage module according to claim 1, characterized in that: The bottom of both the left shell (4) and the right shell (7) are equipped with movable pulleys (3).

8. A method of using a mobile diesel engine waste heat recovery energy storage module according to any one of claims 1-7, characterized in that: When recovering and storing waste heat from industrial flue gas, the flue gas first passes through the flue gas inlet (2), the porous grille (11-1), the left shell (4), the left quick interface (5), the right quick interface (6), the porous grille (11-2), the right shell (7), and the flue gas outlet (8) in sequence. When the flue gas passes through the left porous grille (11-1), it is evenly distributed into the shell. The high-temperature flue gas exchanges heat with the heat storage ball (12). The phase change material in the heat storage ball (12) performs phase change heat storage, realizing the recovery and storage of waste heat in the modular device. When the device provides end-point heating, the outdoor air passes through the same path as the flue gas during waste heat recovery. The cold air is heated by the heat storage ball (12), thereby realizing end-point heating.

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