A system and method for heating using heat from flue gas of a heating furnace

Abstract

The present application belongs to the technical field of heating equipment, and discloses a system and method for heating by utilizing the heat of flue gas of a heating furnace. The system comprises a heating furnace and a waste heat utilization device. The heating furnace comprises a furnace body and a furnace core fixedly arranged in the furnace body. The waste heat utilization device comprises a dry heat dissipation module and a heat absorption water tank module. The dry heat dissipation module comprises an upper heat dissipation tank, a lower heat dissipation tank and a heat dissipation pipe. The heat absorption water tank module comprises a heat exchange tank and a flue gas heat dissipation tank. A water jacket is formed between the inner wall of the heat exchange tank and the outer wall of the flue gas heat dissipation tank. A plurality of water pipes are fixedly arranged in the flue gas heat dissipation tank and are in communication with the water jacket. The method comprises adapting different fuels by setting different furnace cores and furnace cans, and adapting different heat utilization scenarios by selecting and matching the dry heat dissipation module and the heat absorption water tank module. The present application has the advantages of flexible adaptation to different fuels and different heat utilization modes, free combination according to real-time requirements, high practicability and high commercial value.

Description

Technical Field

[0001] This invention belongs to the field of heating equipment technology, and relates to a system for heating by utilizing the heat of flue gas from a heating furnace, and also relates to a method for heating by utilizing the heat of flue gas from a heating furnace. Background Technology

[0002] Traditional solid fuel stoves such as wood-burning stoves and coal-burning stoves are widely used in rural and remote areas, as well as for emergency heating and cooking. However, existing solid fuel stoves generally suffer from the following technical defects: (1) When heating and cooking, the boiler usually uses flue gas to heat the circulating water directly, and then uses the circulating water for daily life or heating. The heated circulating water is usually connected to the water heating system. However, this method relies on the existing water heating system, the heating method is singular, and the heat utilization rate is low. (2) The key parameters of the boiler, such as the structure, air intake method, and combustion chamber volume, are usually only for a specific fuel. However, when the fuel price fluctuates, there is a seasonal supply shortage, or the market channel changes and the fuel type needs to be changed, the original boiler cannot adapt to the combustion characteristics of the new fuel, resulting in a significant decrease in combustion efficiency and a sharp increase in flue gas emissions. Summary of the Invention

[0003] The present invention aims to provide a system for heating by utilizing the heat of flue gas from a heating furnace, so as to achieve high utilization rate of flue gas waste heat and reduce harmful gases in the flue gas; The present invention also provides a method for heating by utilizing the heat from flue gas in a heating furnace, so as to achieve the purpose of diversifying heating methods.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A heating system that utilizes the heat from flue gas from a heating furnace includes a heating furnace that generates flue gas and a waste heat recovery device that utilizes the heat from the flue gas. The heating furnace includes a furnace body and a furnace core fixed inside the furnace body. The furnace body is provided with a flue gas outlet. The furnace core is square, forming a furnace chamber for burning square fuel. A furnace liner is detachably provided inside the furnace core to reduce the combustion space inside the furnace chamber. The furnace liner has a square cross-section for burning square fuel, or the furnace liner has a circular cross-section for burning circular or irregular fuel. The waste heat utilization device includes a dry heat dissipation module and a hot water tank module; The dry heat dissipation module includes an upper heat dissipation box and a lower heat dissipation box, which are connected by multiple heat dissipation pipes. The lower heat dissipation box is connected to the exhaust port of the furnace body through a flue pipe. The hot water absorption tank module includes a heat exchange box and a flue gas heat dissipation box fixed inside the heat exchange box. A water jacket is formed between the inner wall of the heat exchange box and the outer wall of the flue gas heat dissipation box. Multiple water pipes are fixed inside the flue gas heat dissipation box, and both ends of the water pipes are fixedly connected to the inner wall of the flue gas heat dissipation box, so that the inside of the water pipe is connected to the water jacket. The flue gas heat dissipation box is connected to the exhaust port of the furnace body through the flue pipe. The hot water absorption tank module is connected to the water heating system.

[0005] As a limitation of the present invention, the furnace body includes a furnace shell and furnace bars fixed to the lower end of the furnace core. The furnace shell is provided with a primary air distribution port and an air control plate for controlling the opening of the primary air distribution port. A baffle plate is fixed on the furnace bars. The primary air is discharged upward through the furnace bars. A secondary air distribution channel is formed between the furnace core and the furnace shell. The side of the furnace core is provided with a number of secondary air distribution ports, and the side of the furnace shell is provided with a number of air inlets. After the primary air enters the secondary air distribution channel, it enters the furnace core through the secondary air distribution port or enters the furnace shell through the air inlet. The density of the secondary air distribution ports and air inlets is greater in the upper part than in the lower part.

[0006] As a further limitation of the present invention, the heating furnace also includes an oven for heating food, the oven being fixed to the side of the furnace body, and the oven having a detachable door.

[0007] As another limitation of the present invention, the upper end of the furnace liner is folded outward to form a flange, the flange overlaps the upper port of the furnace core, and the flange of the furnace liner is locked to the furnace core by means of pin insertion.

[0008] As a limitation of the present invention, a water storage tank is fixedly attached to the outer sleeve of one of the heat dissipation pipes, and a faucet is fixedly attached to the water storage tank.

[0009] As a further limitation of the present invention, a temperature sensor and an electric heating device are fixedly installed inside the hot water tank module, and the electric heating device is electrically connected to the photovoltaic panel.

[0010] As a third limitation of the present invention, heat dissipation fins are fixedly provided on the outer wall of the heat dissipation pipe, and a heat dissipation fan is fixedly provided on the heat dissipation pipe.

[0011] As a limitation of the present invention, a water-cooled thermoelectric generator is fixedly provided on the outer wall of the oven. The hot end of the water-cooled thermoelectric generator is fixedly provided on the outer wall of the oven, and the cold end is fixedly connected to a water-cooling plate. The water-cooled thermoelectric generator provides power to the cooling fan.

[0012] As a further limitation of the present invention, a detachable, upside-down air-cooled thermoelectric generator is provided inside the oven. The hot end of the air-cooled thermoelectric generator is fixedly connected to the inner wall of the oven, and the cold end is fixedly connected to a temperature control fan. The air-cooled thermoelectric generator provides power to the temperature control fan.

[0013] A method for heating using the heat from flue gas of a heating boiler, comprising: arbitrarily combining the heating boiler with a dry heat dissipation module and a hot water tank module, or switching the order of use of the two as needed to meet different heat energy utilization scenarios; for the heating boiler, equipping it with a furnace liner smaller than the furnace core in the boiler body, with at least two furnace liners, the cross-section of which is square or round, and using the furnace core and furnace liner of different sizes or shapes to adapt to different specifications of fuel.

[0014] By adopting the above-described technical solution, the beneficial effects achieved by this invention compared to the prior art are as follows: (1) Based on the furnace body adaptability to different fuels, this invention sets up two types of heat energy utilization modules. Among them, the dry heat dissipation module directly dissipates the heat of high-temperature flue gas into the room through radiation and convection, which is suitable for heating scenarios without water heating facilities; the hot water absorption tank module forms a water jacket with the flue gas heat dissipation tank and is connected to the water heating pipeline to dissipate the heat of high-temperature flue gas into the room through circulating hot water, which is suitable for heating scenarios with water heating facilities. According to the real-time changes of heating infrastructure and heating scenario, different waste heat utilization devices can be selected and combined to achieve diversification of waste heat utilization and improve heat utilization efficiency; at the same time, This invention uses a fixed furnace core inside the furnace body, which can realize the utilization of large-capacity square fuel. By replacing the furnace core with furnace linings of different sizes and shapes, the combustion space inside the furnace can be changed, thereby adapting to different forms and volumes of fuel. The round furnace lining, due to its smooth edges, can gather irregularly shaped fuel, making the fuel burn more completely. Different furnace linings can be selected and combined according to the shape of the fuel to achieve complete combustion. This invention solves the problems of increased dust removal or adsorption costs due to the generation of a large amount of harmful gases at the source and the single heating method in traditional heat utilization systems, and has strong applicability. (2) The present invention sets a baffle plate on the furnace bar to slow down the discharge speed of the primary air volume, prolong the residence time of the unburned gas in the furnace body, and ensure complete combustion. At the same time, through secondary air distribution, sufficient oxygen is provided to the upward flue gas, so that the unburned gas is burned again before being discharged, thereby improving combustion efficiency and reducing the emission of harmful gases. (3) The heat generated by combustion in this invention acts directly on the furnace core or furnace shell, reducing the direct burning of the furnace body. In addition, the secondary air distribution channel between the furnace body and the furnace core reduces the intensity of the flame directly scouring the inner wall of the furnace body, further mitigating the risk of thermal fatigue and cracking, and greatly improving the service life of the furnace body. (4) The present invention connects a water storage tank to the outside of the heat dissipation pipe of the dry heat dissipation module and sets a faucet, which can use the heat of flue gas to heat water, provide domestic hot water while providing heating, without the need for additional hot water equipment, making it more convenient to use; (5) The hot water tank module of the present invention is equipped with an electric heating device. When there is sufficient solar energy, clean electricity can be used to assist in heating or heat preservation, reduce fuel consumption, achieve multi-energy complementarity, and save energy and protect the environment. (6) The present invention sets up two modes of power generation: water-cooled power generation and air-cooled power generation. Thermoelectric power generation provides power to the fan. The fan accelerates the heat diffusion and drives the fan to dissipate heat by generating power through its own thermoelectricity, thus ensuring the self-sufficiency of power. (7) In the process of utilizing the waste heat of flue gas, the flue gas emission channel is extended, causing a large amount of particulate matter in the flue gas to settle. At the same time, the full combustion reduces the emission of harmful gases, making it more environmentally friendly. (8) The design of the air distribution port and air inlet of the present invention, combined with the square furnace core, enables the airflow to form a three-dimensional rolling state, disturbing the airflow in the furnace, so that the flame zone can obtain sufficient oxygen, increase the gasification effect, ensure complete combustion, and reduce the emission of gas.

[0015] In summary, this invention, through its modular design, flexibly adapts to different fuels and heating methods, allows for free combination according to real-time needs, diversifies waste heat utilization, and is highly practical and commercially valuable. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of the present invention; Figure 2 This is a schematic cross-sectional view of the heating boiler in Embodiment 1 of the present invention when no furnace is installed; Figure 3 This is a three-dimensional structural diagram of the furnace core in Embodiment 1 of the present invention; Figure 4 This is a schematic cross-sectional view of the furnace structure in Embodiment 1 of the present invention when a furnace liner is installed inside the heating furnace; Figure 5 This is a schematic diagram of the front view of the square furnace liner in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the main structure of the circular furnace liner in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the main structure of the dry heat dissipation module according to Embodiment 1 of the present invention; Figure 8 This is a cross-sectional structural diagram of the hot water tank module in Embodiment 1 of the present invention.

[0018] In the diagram: 1-Heating boiler, 11-Boiler body, 111-Boiler shell, 112-Boiler bars, 113-Ashes collection drawer box, 114-Primary air distribution outlet, 115-Air control plate, 116-Wind baffle plate, 117-Boiler opening, 118-Fire control plate, 119-Smoke exhaust outlet, 12-Boiler core, 121-Upper annular sealing plate, 122-Lower annular sealing plate, 123-Air inlet, 124-Secondary air distribution channel, 125-Secondary air distribution outlet, 13-Boiler liner, 131-Air inlet, 14-Baking furnace Box, 15-Box door, 2-Dry heat dissipation module, 21-Upper heat dissipation box, 22-Lower heat dissipation box, 23-Heat pipe, 231-Heat dissipation fins, 232-Heat dissipation fan, 24-Water storage tank, 25-Faucet, 3-Hot water tank module, 31-Heat exchange box, 32-Flue gas heat dissipation box, 33-Water pipe, 34-Temperature sensor, 35-Electric heating device, 4-Air-cooled thermoelectric generator; 5-Temperature-controlled fan, 6-Water-cooled thermoelectric generator, 7-Water storage tank, 8-Flue pipe. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and understanding purposes only and are not intended to limit the scope of the invention. Example 1

[0020] like Figure 1 As shown, this embodiment is a system for heating by utilizing the heat from the flue gas of a heating furnace, including a heating furnace 1 and a waste heat utilization device. The heating furnace 1 is used to burn fuel to generate heat, and the waste heat utilization device utilizes the waste heat in the flue gas of the heating furnace 1 for heating.

[0021] like Figure 2 As shown, the heating boiler 1 includes a boiler body 11, a furnace core 12 fixed inside the boiler body 11, and an oven 14 fixed on the boiler body 11. The boiler body 11 includes a furnace shell 111 and furnace bars 112 fixed to the lower end of the furnace core 12. The furnace shell 111 is formed by welding steel plates. An ash collection drawer box 113 is inserted into the furnace shell 111, located below the furnace bars 112. The ash collection drawer box 113 is provided with a primary air distribution port 114, and an air control plate 115 for controlling the air volume is inserted into the primary air distribution port 114. By controlling the insertion position of the air control plate 115, the opening size of the primary air distribution port 114 is adjusted. A baffle plate 116 is fixed at the center of the furnace bars 112 to slow down the flow speed of the primary air, allowing unburned flue gas to remain for a longer time and ensuring its complete combustion. A furnace opening 117 is provided above the furnace body 11. A fire control plate 118 is detachably provided on the furnace opening 117. By manually adjusting the opening of the fire control plate 118 covering the furnace opening 117, the air intake in the furnace body 11 is controlled, thereby controlling the fuel combustion speed.

[0022] like Figure 3As shown, the furnace core 12 has a square structure and is fixedly installed inside the furnace shell 111 to form the furnace chamber. The furnace bars 112 are fixed to the bottom of the furnace core 12 and are flush with the bottom of the furnace core 12. A cavity is formed between the upper part of the furnace core 12 and the furnace opening 117, where flue gas accumulates. A flue gas outlet 119 is provided on the furnace shell 111 at this location. An upper annular sealing plate 121 is fixedly installed at the upper end of the furnace core 12, and a lower annular sealing plate 122 is fixedly installed at the lower end of the furnace core 12. The lower annular sealing plate 122 has multiple air inlets 123. The edges of both the upper and lower annular sealing plates 121 and 122 are fixedly connected to the inner wall of the furnace shell 111, forming a secondary air distribution channel 124 between the furnace core 12 and the furnace shell 111. Several secondary air distribution ports 125 are opened on the side wall of the furnace core 12. Since most of the oxygen in the airflow has been consumed at the bottom and middle of the flame, the secondary air distribution ports 125 are arranged in a denser pattern at the top and sparser at the bottom to ensure complete combustion of the flue gas before it is discharged. This means that the number of openings near the top of the furnace core 12 is greater than that at the bottom, to match the oxygen demand of the combustion flame before it is discharged. After entering through the primary air distribution port 114, the airflow is discharged upwards via two routes: one route is through the grate bars 112 and the furnace opening 117, and the other route is through the air inlet 123, the secondary air distribution channel 124, the secondary air distribution port 125, and the furnace opening 117.

[0023] like Figures 4-6As shown, a furnace liner 13 is detachably installed inside the furnace core 12. The upper end of the furnace liner 13 is folded outward to form a flange, which overlaps the furnace core 12. Through holes are provided on the flange, and through holes are also provided at the upper end of the furnace core 12. Pins are inserted into the two through holes to lock the furnace liner 13 onto the furnace core 12, achieving fixation. The furnace liner 13 is used to reduce the combustion space of the furnace chamber and is adaptable to different fuels. In this embodiment, the lower end of the furnace liner 13 can be placed directly on the grate 112. The furnace liner 13 has two shapes: square and round. A square furnace liner 13 is suitable for burning square fuels, and its cross-sectional area is smaller than that of the furnace core 12. When fuel is scarce, a square furnace liner 13 can be placed inside the furnace core 12 to concentrate the fuel during combustion. A round furnace liner 13 is suitable for burning round fuels (such as round honeycomb briquettes) or irregularly shaped fuels (such as firewood, lump coal, biomass briquettes, etc.). For the circular furnace liner 13, the upper cross-sectional area of ​​the furnace liner 13 gradually decreases, forming a tapered opening to prolong the residence time of combustible gas in the combustion zone. Several air inlets 131 are provided on the side of the furnace liner 13, also for secondary air intake. The arrangement of the air inlets 131 is the same as that on the furnace core 12, with denser inlets at the top and sparser inlets at the bottom. Secondary air enters the area between the furnace core 12 and the furnace liner 13 through the secondary air distribution channel 124, and then enters the upper part of the furnace liner 13 through the air inlets 131. In this embodiment, three furnace liner 13s are provided: one square furnace liner 13 and two circular furnace liner 13s, with different cross-sectional areas for the two circular furnace liner 13s.

[0024] The oven 14 is fixed to the side of the oven body 11, and its upper end face is flush with the upper end face of the oven body 11. The interior of the oven 14 forms a cavity for heating food. The oven 14 is detachably equipped with a door 15. When heating food, the door 15 is installed to form a closed heating space. When heating food is not required, the door 15 is removed to allow the cavity to communicate with the outside.

[0025] A removable air-cooled power generation device 4 is installed inside the cavity of oven 14. The device is inverted and mounted on the upper part of oven 14. Specifically, the hot end of the device is fixedly connected to the inner wall of oven 14, and the cold end is a heat dissipation fin. After heat dissipation, a temperature difference is created, which is used to generate electricity. This air-cooled power generation device 4 is existing technology and will not be described in detail. A temperature-controlled fan 5 is fixedly connected to the lower end of the heat dissipation fin. The electricity generated by the air-cooled power generation device 4 powers the temperature-controlled fan 5. Simultaneously, the rotation of the temperature-controlled fan 5 increases the temperature difference effect, further facilitating power generation, forming a self-sufficient fan cooling mode. The air-cooled power generation device 4 is also connected to a controller. The controller sets a temperature control threshold. When the temperature of the power generation fins of the air-cooled power generation device 4 reaches the threshold, the temperature-controlled fan 5 starts to dissipate heat.

[0026] The waste heat recovery device includes a dry heat dissipation module 2 and a hot water absorption tank module 3. These two modules are optional for this system. Dry heat dissipation module 2 is selected when directly utilizing heat from the flue gas. If the waste heat recovery scenario includes plumbing facilities, hot water absorption tank module 3 is selected and connected to the plumbing facilities (radiators or underfloor heating pipes) via piping.

[0027] like Figure 7 As shown, the dry heat dissipation module 2 includes an upper heat dissipation box 21 and a lower heat dissipation box 22, which are connected by four vertically arranged heat dissipation pipes 23. The heat dissipation pipes 23 are metal round tubes, evenly spaced. The lower heat dissipation box 22 is connected to the exhaust port 119 of the furnace body 11 via a flue pipe 8. High-temperature flue gas, after being discharged from the furnace body 11, enters the lower heat dissipation box 22, then flows upward through the heat dissipation pipes 23 to the upper heat dissipation box 21, and finally enters the outdoor chimney from the exhaust port of the upper heat dissipation box 21. During the flow of flue gas through the heat dissipation pipes 23, heat is directly dissipated into the indoor air through radiation and convection via the pipe walls for heat utilization, achieving the purpose of heating. Heat dissipation fins 231 are fixed on the outer wall of the heat dissipation pipes 23, connecting the heat dissipation pipes 23 and forming multiple rows in the vertical direction. A cooling fan 232 is fixed on the heat dissipation pipes 23. A water-cooled thermoelectric generator 6 is fixedly mounted on the outer wall of the oven 14. The hot end of the water-cooled thermoelectric generator 6 is an aluminum block, and the cold end is a water-cooled plate. Thermoelectric generator plates are fixed between the aluminum block and the water-cooled plate. The aluminum block at the hot end of the water-cooled thermoelectric generator 6 is fixed to the outer wall of the oven 14. The water-cooled plate at the cold end is connected to an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe are fixedly connected to a water storage tank 7. The water storage tank 7 is placed at a higher position than the water-cooled thermoelectric generator 6, forming a height difference, so that the cooling water circulates in the water-cooled plate. This is existing technology and will not be described in detail. In order to improve the heat dissipation speed of the water storage tank 7, heat dissipation fins are fixedly mounted on the outer wall of the water storage tank 7. The water cooling creates a large temperature difference in the thermoelectric generator plates, increasing the power generation. The water-cooled thermoelectric generator 6 provides power to the cooling fan 232. Excess power is stored in a power bank or battery to power small-power electrical appliances.

[0028] To improve practicality, a water storage tank 24 is fixedly fitted onto the outside of the outermost heat dissipation pipe 23. The water storage tank 24 has a water inlet at the top and a faucet 25 fixed at the bottom. The water storage tank 24 surrounds the outer wall of the heat dissipation pipe 23, and the high temperature of the heat dissipation pipe 23 heats the water in the water storage tank 24, which can provide domestic hot water at the same time as heating, such as for washing hands and dishes.

[0029] like Figure 8As shown, the hot water tank module 3 includes a heat exchange box 31 and a flue gas heat dissipation box 32 fixed inside the heat exchange box 31. The heat exchange box 31 is a square, sealed container made of welded metal plates. The flue gas heat dissipation box 32 is located in the center of the water tank and is connected to the exhaust port 119 of the furnace body 11 via a flue pipe 8. The exhaust port is connected to the outdoor chimney. The upper part of the flue gas heat dissipation box 32 is provided with heat dissipation fins 231, which are fixed to the outer wall of the flue gas heat dissipation box 32 to increase the heat dissipation area. A water jacket is formed between the inner wall of the heat exchange box 31 and the outer wall of the flue gas heat dissipation box 32 to store circulating water. Multiple water pipes 33 are fixed inside the flue gas heat dissipation box 32, with both ends of the water pipes 33 fixed to the wall of the flue gas heat dissipation box 32, so that the interior of the water pipes 33 is connected to the water jacket. When high-temperature flue gas flows through the flue gas heat exchange box 32, the water in the water jacket absorbs heat from the flue gas and heats up. The flue gas inside the heat exchange box 32 surrounds the water pipes 33, causing the water inside the water pipes 33 to heat up as well. The water pipes 33 increase the heating area and allow the water inside to heat up faster, forming an internal circulation with the water in the water jacket, thus improving the uniformity of heat absorption. The outlet and inlet of the heat exchange box 31 are connected to the inlet and return water pipes of the plumbing system, respectively, forming a circulation through the circulating pump of the plumbing system. The hot water tank module 3 acts as a coupling tank in the plumbing system, buffering the circulation pressure and increasing the heating speed of the circulating water.

[0030] A temperature sensor 34 and an electric heating device 35 are fixedly installed inside the heat exchange box 31. The electric heating device 35 is electrically connected to the photovoltaic panel. In this embodiment, the electric heating device 35 is a heating rod. The temperature sensor 34 is used to monitor the water temperature inside the water jacket. When the water temperature is lower than the set value and the photovoltaic panel generates sufficient electricity, the electric heating device 35 can be activated to assist in heating and reduce fuel consumption. When the water temperature reaches the set value, the electric heating device 35 automatically shuts off. The electric heating device 35 is a multi-energy complementary module of this system, making it more energy-efficient and environmentally friendly.

[0031] In this embodiment, multiple thermoelectric generators 4 are fixedly installed on the outer wall of the heat exchange box 31. The thermoelectric generators 4 utilize existing technology and mainly consist of hot-end and cold-end thermoelectric plates. The hot-end thermoelectric plates extend into the water jacket inside the heat exchange box 31, directly contacting the circulating water within the jacket to absorb heat from the circulating water. The cold-end thermoelectric plates are located outside the heat exchange box 31, exposed to the surrounding air, and exchange heat with the environment through natural convection or auxiliary heat dissipation structures. The multiple thermoelectric generators 4 are electrically connected in series. The generated electrical energy can be rectified and regulated by a voltage regulator circuit and stored in a battery or power bank for daily low-power electricity use. The power generation principle is as follows: the circulating water inside the water jacket is heated to a higher temperature by the flue gas, while the external ambient temperature is relatively low, thus creating a significant temperature difference between the two ends of the thermoelectric plates. Based on the Seebeck effect, the thermoelectric generator directly converts heat energy into electrical energy, achieving thermoelectric power generation.

[0032] This embodiment has multiple combination methods. On the one hand, the heating boiler 1, through the combination of the furnace core 12 and the furnace chamber 13, forms furnaces of different sizes and shapes to cope with real-time fuel changes. On the other hand, the heating boiler 1 can be combined with different heat dissipation modules to cope with different heating scenarios and real-time heating needs. Four waste heat utilization scenarios are listed below.

[0033] 1. For users with square honeycomb briquettes but no water heating facilities: Combine the furnace body 11 with the dry heat dissipation module 2. By adjusting the length of the flue pipe 8, place the dry heat dissipation module 2 in important heating locations, spatially separating it from the heating furnace 1 to improve the uniformity of heat distribution. When square fuel is insufficient or the temperature requirement is not high, place a square furnace liner 13 inside the furnace core 12, and burn the fuel inside the square furnace liner 13 to reduce fuel consumption.

[0034] 2. For users with square honeycomb briquettes but no water heating facilities: Combine the heating furnace 1 with the dry heat dissipation module 2. By adjusting the length of the flue pipe 8, place the dry heat dissipation module 2 in an important heating location, spatially separating it from the heating furnace 1 to improve the uniformity of heat distribution. Place a circular furnace liner 13 inside the furnace core 12, and add coal blocks to the furnace liner 13 to generate heat.

[0035] 3. The user has square fuel and water heating facilities: Combine the heating furnace 1 with the hot water tank module 3, connect the hot water tank module 3 to the water heating facilities, and add square fuel to the furnace core 12 to generate heat.

[0036] 4. Users have square honeycomb briquettes and coal blocks, and have water heating facilities: When whole-house heating is needed in the depths of winter, the heating furnace 1 is combined with the hot water tank module 3. The hot water tank module 3 is connected to the water heating facilities, and square fuel is added into the furnace core 12, resulting in good heating performance. In early winter or early spring, when heating is needed in a single room, the connection between the heating furnace 1 and the hot water tank module 3 is disconnected, and the heating furnace 1 is combined with the dry heat dissipation module 2. A round furnace liner 13 is placed inside the furnace core 12, and coal blocks are added into the furnace liner 13. This can meet basic heating needs while saving fuel. Example 2

[0037] A method for heating using the heat from flue gas in a heating boiler, based on a heating system for heating using the heat from flue gas in Embodiment 1, wherein the method for heating using the waste heat in the flue gas in this embodiment is as follows: on the one hand, by combining the furnace core 12 and the furnace chamber 13 inside the heating boiler 1, different fuels can be adapted. On the other hand, by combining the heating boiler 1 with a dry heat dissipation module 2 or a hot water tank module 3, different heating methods can be adapted.

[0038] The specific method is as follows: For the heating boiler 1, multiple furnace bladders 13 smaller than the furnace core 12 in the boiler body 11 are provided. The furnace bladders 13 are of two shapes: square and round. One square furnace bladder 13 is provided, with a cross-sectional area smaller than the furnace core 12. Two round furnace bladders 13 are provided, with different cross-sectional areas. By selecting furnace bladders 13 of different sizes or shapes, different specifications of fuel can be used to meet fuel needs at different times. The heating boiler 1 can be connected to a dry heat dissipation module 2, allowing the heat from the flue gas to be directly diffused into the air for heating. Alternatively, the heating boiler 1 can be connected to a hot water absorption tank module 3, which is then connected to a hydronic heating system to convert the heat from the flue gas into the heat from the water, which is then diffused into the air for heating. Both methods can be used independently. Alternatively, depending on the needs, the dry heat dissipation module 2 and the hot water tank module 3 can be switched. That is, initially, the heating boiler 1 is connected to the dry heat dissipation module 2 for heating, and later the heating boiler 1 is connected to the hot water tank module 3 and the water heating system for heating. Or, initially, the heating boiler 1 is connected to the hot water tank module 3 and the water heating system for heating, and later the heating boiler 1 is connected to the dry heat dissipation module 2 for heating. This method uses both modules and switches the order of use as needed.

[0039] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for heating using the heat from flue gas in a heating boiler, characterized in that, This includes heating boilers that generate flue gas and waste heat recovery devices that utilize the heat from the flue gas. The heating furnace includes a furnace body and a furnace core fixed inside the furnace body. The furnace body is provided with a flue gas outlet. The furnace core is square, forming a furnace chamber for burning square fuel. A furnace liner is detachably provided inside the furnace core to reduce the combustion space inside the furnace chamber. The furnace liner has a square cross-section for burning square fuel, or the furnace liner has a circular cross-section for burning circular or irregular fuel. The waste heat utilization device includes a dry heat dissipation module and a hot water tank module; The dry heat dissipation module includes an upper heat dissipation box and a lower heat dissipation box, which are connected by multiple heat dissipation pipes. The lower heat dissipation box is connected to the exhaust port of the furnace body through a flue pipe. The hot water absorption tank module includes a heat exchange box and a flue gas heat dissipation box fixed inside the heat exchange box. A water jacket is formed between the inner wall of the heat exchange box and the outer wall of the flue gas heat dissipation box. Multiple water pipes are fixed inside the flue gas heat dissipation box, and both ends of the water pipes are fixedly connected to the inner wall of the flue gas heat dissipation box, so that the inside of the water pipe is connected to the water jacket. The flue gas heat dissipation box is connected to the exhaust port of the furnace body through the flue pipe. The hot water absorption tank module is connected to the water heating system.

2. A heating system utilizing the heat from boiler flue gas according to claim 1, characterized in that, The furnace body includes a furnace shell and furnace bars fixed to the lower end of the furnace core. The furnace shell is provided with a primary air distribution port and an air control plate for controlling the opening of the primary air distribution port. A baffle plate is fixed on the furnace bars. The primary air is discharged upward through the furnace bars. A secondary air distribution channel is formed between the furnace core and the furnace shell. The side of the furnace core is provided with several secondary air distribution ports, and the side of the furnace shell is provided with several air inlets. After the primary air enters the secondary air distribution channel, it enters the furnace core through the secondary air distribution ports or enters the furnace shell through the air inlets. The density of the secondary air distribution ports and air inlets is greater in the upper part than in the lower part.

3. A heating system utilizing the heat from boiler flue gas according to claim 2, characterized in that, The heating furnace also includes an oven for heating food, which is fixed to the side of the furnace body and has a detachable door.

4. A system for heating using the heat from flue gas of a heating boiler according to any one of claims 1-3, characterized in that, The upper end of the furnace liner is folded outward to form a flange, which overlaps the upper end of the furnace core and is locked to the furnace core by means of pin insertion.

5. A system for heating using the heat from boiler flue gas according to claim 4, characterized in that, One of the heat dissipation pipes is fitted with a water tank, and a faucet is fixed on the water tank.

6. A system for heating using the heat from boiler flue gas according to claim 5, characterized in that, The hot water tank module is equipped with a temperature sensor and an electric heating device, which is electrically connected to the photovoltaic panel.

7. A system for heating using the heat from flue gas of a heating boiler according to any one of claims 1-3, 5, and 6, characterized in that, Heat dissipation fins are fixed on the outer wall of the heat dissipation pipe and the outer wall of the flue gas heat dissipation box, and a cooling fan is fixed on the heat dissipation pipe.

8. A system for heating using the heat from boiler flue gas according to claim 7, characterized in that, A water-cooled thermoelectric generator is fixedly installed on the outer wall of the oven. The hot end of the water-cooled thermoelectric generator is fixedly installed on the outer wall of the oven, and the cold end is fixedly connected to a water-cooling plate. The water-cooled thermoelectric generator provides power to the cooling fan.

9. A system for heating using the heat from boiler flue gas according to claim 8, characterized in that, A removable, upside-down air-cooled thermoelectric generator is installed inside the oven. The hot end of the air-cooled thermoelectric generator is fixedly connected to the inner wall of the oven, and the cold end is fixedly connected to a temperature control fan. The air-cooled thermoelectric generator provides power to the temperature control fan.

10. A method for heating using the heat from flue gas in a heating furnace, characterized in that, The heating method of the system using the heat of flue gas from a heating furnace as described in any one of claims 1-7 includes: arbitrarily combining the heating furnace with a dry heat dissipation module and a hot water tank module, or switching the order of use of the two as needed to meet different heat energy utilization scenarios; for the heating furnace, a furnace liner smaller than the furnace core in the furnace body is provided, and at least two furnace liner are provided, with a square or circular cross-section, and different specifications of fuel are adapted by using the furnace core and furnace liner of different sizes or shapes.

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