Covering type modular device for recovering and storing flue gas waste heat

Abstract

The utility model discloses a modular device for recycling and storing flue gas waste heat in an overlapping mode. The modular device comprises a water storage shell, a steam collecting chamber, a heat storage tank, a separated heat pipe and a tail end heat exchanger. A smoke inlet chamber and a smoke outlet chamber are arranged on the left side and the right side of the water storage shell respectively and communicated with a smoke inlet and a smoke outlet, a steam collecting chamber is arranged in the middle of the upper portion of the water storage shell and directly communicated with the steam collecting chamber, and a plurality of flue pipe bundles which are arranged in a staggered mode are arranged in the steam collecting chamber and communicated with the smoke inlet chamber and the smoke outlet chamber. An evaporation section of the separated heat pipe is arranged in the steam collecting chamber, a condensation section of the separated heat pipe is arranged in the heat storage tank, the evaporation section and the condensation section are connected through an ascending pipe and a descending pipe and are distributed side by side in a multi-pipe mode, and a tail end heat exchanger is arranged in the heat storage tank and used for transferring stored heat to the outside. According to the device, flue gas waste heat can be recycled through the overlapping type heat exchanger and stored in the heat storage tank, the whole device is a modular device, flue gas recycling and reusing are achieved, and energy can be saved. The device is suitable for industrial waste heat recovery of diesel engines, boilers and the like.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery, specifically a modular device for cascading recovery and storage of waste heat from flue gas. Background Technology

[0002] Energy efficiency and sustainable development have become critical issues in today's society. The use of traditional energy systems typically generates large amounts of heat, which is often treated as waste and released into the environment. However, this emission not only wastes energy but also has negative environmental impacts such as climate change and air pollution.

[0003] To address this issue, waste heat recovery technology has emerged. Waste heat recovery refers to capturing and utilizing waste heat generated during industrial or commercial processes, converting it into usable energy, thereby improving energy efficiency and reducing environmental impact. Heat exchangers, as a crucial component of waste heat recovery, can be used independently to extract heat from exhaust gas for other applications, such as domestic hot water supply or as fuel injection in cylinders, turbochargers, and EGR systems. Given the current necessity of industrial waste heat recovery, the non-continuous nature of waste heat generation, and space constraints in waste heat recovery systems, heat storage tanks can be combined with cascade heat exchangers.

[0004] Comparing this utility model with existing patents: Patent CN202410539184.2, while capable of recovering moisture and waste heat from flue gas, still requires external electrical input to maintain system operation; Patent CN201010173482.2 uses a thermal oil heat exchanger for waste heat recovery, but although the circulating working fluid is thermal oil, additional electrical equipment is still needed to control the flow rate of the bypass thermal oil, making it impossible to operate without external power input. This patent, however, utilizes a passive, separate heat pipe as the core component of the heat exchanger, ensuring that the energy recovered by the waste heat recovery system exceeds the energy used for waste heat recovery; Patent CN202323059685.0, while able to maintain system operation without external power, has a relatively complex structure, and to prevent dust accumulation in the flue gas, the equipment structure must remain fixed, impacting application... The site has certain requirements, and this patent has a simple and compact structure that can be flexibly modularized. Although patent CN201610078839.6 has optimized the waste heat recovery device of the shell-and-tube heat exchanger in terms of structure, the overall structure has 6 branch pipes and the connection of each pipe is complicated, which is not conducive to practical application. This patent has only 2 branch pipes with smaller diameters, and the position and length of the branch pipes can be adjusted according to actual needs. Patent CN200610032145.5 also uses heat pipes as the core equipment of the heat exchanger, but it uses a single gravity heat pipe and inserts the heat pipe directly into the flue. This method is prone to heat pipe corrosion by flue gas, resulting in loss of heat exchange capacity. This patent not only uses water as an intermediate medium to prevent flue gas corrosion, but also designs the heat pipe as a separate heat pipe, thereby saving space and facilitating modular installation.

[0005] By comparing this invention with existing patents, it can be found that this patent has the advantages of being passive, modular assembly, high safety, compact equipment with low flue gas pressure drop, long service life and low investment.

[0006] Therefore, in order to make more effective use of limited space for the rational and efficient recovery and utilization of intermittent industrial flue gas waste heat, and to achieve the goals of energy conservation, environmental protection and energy recycling, it is necessary to design a modular device for cascading recovery and storage of flue gas waste heat to solve the problems of intermittent industrial heat generation and energy shortage. This device can achieve modular assembly and can recover waste heat without external energy input. Utility Model Content

[0007] The purpose of this invention is to provide a modular device for recovering and storing waste heat from flue gas in a cascading manner, so as to solve the problems of intermittent generation of industrial waste heat 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.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a modular device for recovering and storing waste heat from flue gas in a cascaded manner, comprising a water storage shell, a steam collection chamber, a separate heat pipe, a heat storage tank, a terminal heat exchanger, a flue gas inlet, and a flue gas outlet.

[0009] The water storage shell has a flue gas inlet chamber and a flue gas outlet chamber on its left and right sides, respectively. The flue gas inlet chamber is connected to the flue gas inlet, and the flue gas outlet chamber is connected to the flue gas outlet. A steam collection chamber is installed in the middle of the upper part of the water storage shell and is directly connected to the water storage shell. A flue tube bundle is installed inside the water storage shell. The two sides of the flue tube bundle are connected to the flue gas inlet chamber and the flue gas outlet chamber, respectively. The evaporation section of the separate heat pipe is installed in the steam collection chamber, and the condensation section of the separate heat pipe is installed in the heat storage tank. The heat storage tank is equipped with a terminal heat exchanger.

[0010] Preferably, the modular device for recovering and storing waste heat from flue gas in a cascaded manner is characterized in that: the flue tube bundle, the flue gas inlet chamber, the flue gas outlet chamber, the flue gas inlet, and the flue gas outlet constitute a cavity.

[0011] Preferably, the modular device for recovering and storing waste heat from flue gas in a cascading manner is characterized in that: the water storage shell is directly connected to the steam collection chamber.

[0012] Preferably, the modular device for recovering and storing waste heat from flue gas in a cascaded manner is characterized in that: the separate heat pipe condensation section and the separate heat pipe evaporation section are arranged in a multi-pipe parallel configuration and connected by riser pipes and downcomer pipes.

[0013] Preferably, the modular device for recovering and storing waste heat from flue gas in a cascaded manner is characterized in that: the heat storage tank, the separate heat pipe condensing section, and the terminal heat exchanger constitute a cavity.

[0014] Preferably, the modular device for recovering and storing waste heat from flue gas in a cascaded manner is characterized in that: the heat storage tank transfers heat to the outside through a terminal heat exchanger.

[0015] Preferably, the modular device for recovering and storing waste heat from flue gas in a cascading manner is characterized in that the individual tubes of the flue tube bundle are arranged in a staggered manner.

[0016] Compared with the prior art, the beneficial effects of this utility model are: the modular device for recovering and storing waste heat from flue gas in a stacked manner:

[0017] When the device performs waste heat recovery from flue gas, the flue gas passes through the flue gas inlet, flue gas inlet chamber, flue tube bundle, flue gas outlet chamber, and flue gas outlet. In the flue tube bundle, the flue gas exchanges heat with water in the water storage tank, causing the water to evaporate. The evaporated water vapor is collected in the steam collection chamber and condenses in the evaporation section of the separate heat pipe for heat exchange. The working fluid in the evaporation section of the separate heat pipe carries heat to the condensation section of the separate heat pipe via riser pipes, where it condenses and stores the heat in a heat storage tank. When end users require heat, the working fluid in the heat storage tank exchanges heat with the end heat exchanger to supply domestic hot water, etc.

[0018] The device has a simple structure, consisting of only three highly integrated modules: a water storage tank, flue gas inlet, flue gas intake chamber, flue tube bundle, flue gas outlet chamber, and flue gas outlet are combined into one module; a steam collection chamber and a separate heat pipe evaporation section are combined into another module; and a heat storage tank, a separate heat pipe condensation section, and a terminal heat exchanger are combined into yet another module. This compact design results in a small footprint, high reliability, and easy modular installation.

[0019] During operation, the entire cycle requires no external electrical input, relying solely on the heat from the flue gas. The heat transfer path is as follows: flue gas – flue tube bundle – water in the storage tank – steam collection chamber – evaporator section of the separate heat pipe – condenser section of the separate heat pipe – storage tank – terminal heat exchanger – outside. The entire cycle path shows that the driving force for the device's operation mainly comes from the phase change of water and the passive heat transfer of the separate heat pipes. Furthermore, this is a closed system that only exchanges heat with the outside environment, without any mass exchange, which enhances the overall safety of the device.

[0020] By using this utility model device, a compact new heat exchanger device can be used to recover and store industrial waste heat, solving the problems of intermittent industrial heat generation, energy shortage, and space constraints. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0022] The components are: 1. Flue gas outlet; 2. Flue gas outlet chamber; 3. Water storage shell; 4. Flue tube bundle; 5. Flue gas inlet; 6. Flue gas inlet chamber; 7. Steam collection chamber; 8. Separate heat pipe; 8-4. Separate heat pipe downcomer; 9. Terminal heat exchanger; 10. Heat storage tank.

[0023] Figure 2 This is a schematic diagram of the split heat pipe structure of this utility model;

[0024] Among them: 8-1, separate heat pipe evaporation section; 8-2, separate heat pipe condensation section; 8-3, riser pipe; 8-4, downcomer pipe.

[0025] Figure 3 This is a front view of the main structure of this utility model;

[0026] The components include: 1. Flue gas outlet; 2. Flue gas outlet chamber; 3. Water storage shell; 4. Flue tube bundle; 5. Flue gas inlet; 6. Flue gas inlet chamber; 7. Steam collection chamber; 8. Separate heat pipe; 9. Terminal heat exchanger; 10. Heat storage tank.

[0027] Figure 4 This is a side view of the main structure of this utility model;

[0028] The components include: 1. Flue gas outlet; 2. Flue gas outlet chamber; 7. Steam collection chamber; 8. Separate heat pipe; 9. Terminal heat exchanger; 10. Heat storage tank.

[0029] Figure 5 This is a top view of the main structure of this utility model;

[0030] The components are: 1. Flue gas outlet; 2. Flue gas outlet chamber; 3. Water storage shell; 5. Flue gas inlet; 6. Flue gas inlet chamber; 9. Terminal heat exchanger; 10. Heat storage tank. Detailed Implementation

[0031] The following is an explanation of the appendix of this utility model. Figure 1-5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not the complete embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0032] Please see Figure 1-5 This utility model provides a technical solution: a modular device for recovering and storing waste heat from flue gas in a stacked manner, comprising a water storage shell 3, a steam collection chamber 7, a heat storage tank 10, a separate heat pipe 8, a terminal heat exchanger 9, a flue gas inlet 5, and a flue gas outlet 1. The device is characterized in that: the left and right sides of the water storage shell 3 are respectively equipped with a flue gas inlet chamber 6 and a flue gas outlet chamber 2; the flue gas inlet chamber 6 communicates with the flue gas inlet 5; the flue gas outlet chamber 2 communicates with the flue gas outlet 1; the steam collection chamber 7 is installed in the upper middle part of the water storage shell 3; a flue tube bundle 4 is installed inside the water storage shell 3; the two sides of the flue tube bundle 4 are respectively connected to the flue gas inlet chamber 6 and the flue gas outlet chamber 2; the evaporation section 8-1 of the separate heat pipe is installed in the steam collection chamber 7; the condensation section 8-2 of the separate heat pipe is installed in the heat storage tank 10; and the terminal heat exchanger 9 is installed in the heat storage tank 10.

[0033] The flue tube bundle 4, flue gas inlet chamber 6, flue gas outlet chamber 2, flue gas inlet 5 and flue gas outlet 1 form a cavity, thereby increasing the heat exchange area between the flue gas and the water in the water storage shell and enhancing the heat exchange between the system and the flue gas.

[0034] The water storage shell 3 is directly connected to the steam collection chamber 7, which facilitates the water in the water storage shell to directly enter the steam collection chamber 7 and exchange heat with the separate heat pipe evaporation section 8-1 after being heated and evaporated.

[0035] The condensing section 8-2 and the evaporating section 8-1 of the separate heat pipe are arranged in a multi-pipe parallel manner and connected by riser pipes and downcomer pipes, thereby increasing the contact area between the separate heat pipe and the steam and the working fluid in the heat storage tank and enhancing heat exchange.

[0036] Working principle: When using this modular device for recovering and storing waste heat from flue gas in a cascaded manner, firstly according to... Figure 1 , Figure 2 As shown, this device can recover industrial flue gas, realizing the utilization and storage of waste heat from the flue gas. During the recovery and storage of waste heat from industrial flue gas, the flue gas first passes sequentially through the flue gas inlet, flue gas inlet chamber, flue pipe bundle, flue gas outlet chamber, and flue gas outlet. The flue gas is dispersed in the flue pipe bundle, exchanging heat with water in the water storage tank. The water evaporates upon heating and, driven by the density difference, enters the steam collection chamber to exchange heat with the separate heat pipe evaporation section. The water vapor after heat exchange condenses and returns to the water storage tank. The separate heat pipe evaporation section, after being heated, causes the working fluid inside the pipe to evaporate. It then enters the separate heat pipe condensation section through the riser pipe and exchanges heat with the working fluid in the heat storage tank, undergoing a phase change and condensation, storing the heat in the heat storage tank. The condensate then returns to the separate heat pipe evaporation section through the downcomer pipe. During heat release, the working fluid in the terminal heat exchanger exchanges heat with the working fluid in the heat storage tank, supplying heat to the end users.

Claims

1. A modular device for recovering and storing waste heat from flue gas in a cascaded manner, comprising a water storage shell (3), a steam collection chamber (7), a heat storage tank (10), a split heat pipe (8), a terminal heat exchanger (9), a flue gas inlet (5), a flue gas outlet (1), a split heat pipe evaporation section (8-1), and a split heat pipe condensation section (8-2), characterized in that: The water storage shell (3) is equipped with a flue gas inlet chamber (6) and a flue gas outlet chamber (2) on its left and right sides, respectively. The flue gas inlet chamber (6) is connected to the flue gas inlet (5), and the flue gas outlet chamber (2) is connected to the flue gas outlet (1). A steam collection chamber (7) is installed in the middle of the upper part of the water storage shell (3). A flue tube bundle (4) is installed inside the water storage shell (3). The flue tube bundle (4) is connected to the flue gas inlet chamber (6) and the flue gas outlet chamber (2) on both sides, respectively. The separate heat pipe evaporation section (8-1) is installed in the steam collection chamber (7), and the separate heat pipe condensation section (8-2) is installed in the heat storage tank (10). The heat storage tank (10) is equipped with a terminal heat exchanger (9).

2. The modular device for recovering and storing waste heat from flue gas in a cascaded manner according to claim 1, characterized in that: The flue tube bundle (4), flue gas inlet chamber (6), flue gas outlet chamber (2), flue gas inlet (5) and flue gas outlet (1) constitute a cavity.

3. A modular device for recovering waste heat from flue gases and storing according to claim 1, characterized in that: The water storage shell (3) is directly connected to the steam collection chamber (7).

4. The modular device for recovering waste heat from flue gases and storing according to claim 1, characterized in that: The separate heat pipe condensing section (8-2) and the separate heat pipe evaporating section (8-1) are arranged in a multi-pipe parallel configuration and connected by an ascending pipe (8-3) and a descending pipe (8-4).

5. A modular device for recovering waste heat from flue gases and storing according to claim 1, characterized in that: The heat storage tank (10), the separate heat pipe condenser section (8-2), and the terminal heat exchanger (9) constitute a cavity.

6. The modular device for recovering waste heat from flue gases and storing according to claim 1, characterized in that: The heat storage tank (10) transfers heat to the outside through the terminal heat exchanger (9).

7. A modular device for recovering and storing waste heat from flue gas in a cascaded manner according to claim 1, characterized in that: The individual tubes of the flue tube bundle (4) are arranged in a staggered manner.

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