Horizontal hot-air type organic heat carrier boiler

Abstract

The utility model relates to a boiler technical field, concretely is a horizontal hot -blast type organic heat carrier boiler, including the shell, one end of shell is installed with the burner, the inside of the shell is provided with the pipe body, the combustion head of burner is located in the inside of one end of pipe body, the both ends outside of shell are installed with the water inlet and outlet pipe seat respectively, the both ends of pipe body are connected with water inlet and outlet pipe seat, the pipe body includes three layers heat exchange coil pipe of inner layer, middle layer, outer layer, the inside of inner layer is first return, it is second return between middle layer and inner layer, it is third return between middle layer and outer layer, the flue gas passes through first return and turns back to pass through second return, again turns back to pass through third return, finally discharges. In the horizontal hot -blast type organic heat carrier boiler, adopt three layers heat exchange coil pipe's three return structure design, the inside of inner layer is first return, it is second return between middle layer and inner layer, it is third return between middle layer and outer layer, the flue gas discharges after passing through three return in proper order.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a horizontal hot air type organic heat carrier boiler. Background Technology

[0002] Organic heat carrier boilers play a vital role in industrial production, widely used in industries such as chemical, textile, and food processing. They transfer heat through organic heat carriers to provide the necessary thermal energy for production processes. However, traditional organic heat carrier boilers primarily rely on fossil fuel combustion as their heat source, resulting in low energy efficiency, significant environmental pollution, and high operating costs. Incomplete combustion of fossil fuels not only wastes energy but also generates large amounts of pollutants such as nitrogen oxides and sulfur dioxide, negatively impacting the environment. Furthermore, fluctuating fuel prices make it difficult to control boiler operating costs.

[0003] To address the problems of traditional organic heat carrier boilers, existing technologies are constantly exploring new solutions. For example, Chinese patent application number 201810783693.4 discloses an organic heat carrier boiler, which includes a solid heat storage device, a high-temperature oil pump circulation system, and a hot water circulation system. It uses off-peak electricity to provide a heat source instead of burning organic matter, achieving true zero combustion and zero pollution. Simultaneously, it can effectively utilize off-peak electricity for heat storage, reducing operating costs and contributing to grid load stability. However, this solution relies on off-peak electricity resources, limiting its application scenarios. Furthermore, its complex structure results in high equipment investment costs. Additionally, there is still room for improvement in heat exchange efficiency and overall boiler thermal efficiency; waste heat from flue gas is not utilized, and the overall energy utilization rate needs to be improved. Utility Model Content

[0004] The purpose of this utility model is to provide a horizontal hot air type organic heat carrier boiler to solve the problems mentioned in the background art, such as reliance on off-peak electricity resources, limited application scenarios, complex structure, and high equipment investment costs; at the same time, there is still room for improvement in heat exchange efficiency and overall boiler thermal efficiency, and the waste heat of flue gas is not utilized, and the comprehensive energy utilization rate needs to be improved.

[0005] To achieve the above objectives, this utility model provides a horizontal hot air type organic heat carrier boiler, including an outer shell, a burner installed at one end of the outer shell, a coil body disposed inside the outer shell, the burner head located inside one end of the coil body, and inlet and outlet water pipe seats respectively installed on the outer sides of both ends of the outer shell, the inlet and outlet water pipe seats being connected to both ends of the coil body. The coil body includes three layers of heat exchange coils: an inner layer, a middle layer, and an outer layer. The inner layer is the first pass, the middle layer is the second pass, and the middle layer is the third pass. After passing through the first pass, the flue gas returns to the second pass, then returns to the third pass, and finally is discharged.

[0006] This setup uses a burner to ignite fuel, generating high-temperature flue gas that flows within the inner heat exchange coil (first pass), releasing heat. The flue gas then returns to the second pass between the middle and inner layers, continuing heat exchange with the middle heat exchange coil. It then returns to the third pass between the middle and outer layers, further exchanging heat with the outer heat exchange coil before finally being discharged. This three-pass structure extends the flow path and residence time of the flue gas within the boiler, increasing the contact area and heat exchange time between the flue gas and the heat exchange coil.

[0007] Preferably, a front cover is installed at one end of the outer casing and a rear cover is installed at the other end.

[0008] This feature involves installing the front and rear covers at opposite ends of the outer casing, forming a closed space that protects the internal components of the boiler, preventing external dust and debris from entering the boiler. It also facilitates the inspection and maintenance of the boiler's interior.

[0009] Preferably, a base is mounted on the bottom of the housing, and the base is mounted on a foundation.

[0010] This base is installed at the bottom of the casing, providing stable support for the boiler and evenly distributing its weight to the foundation; the foundation further enhances the stability of the support, preventing the boiler from shaking or tilting during operation.

[0011] Preferably, an explosion-proof door is installed on one end of the housing, and a nameplate and warning label are installed on the outer wall of the end of the housing.

[0012] This feature includes an explosion-proof door installed on one end of the outer casing. When an abnormal situation occurs inside the boiler (such as deflagration) causing a rapid increase in pressure, the explosion-proof door will automatically open to release the pressure and prevent the boiler from exploding. The nameplate displays the boiler's model, parameters, and other information, allowing users to understand the boiler's performance and usage requirements. Warning labels remind operators to pay attention to relevant safety precautions to avoid safety accidents caused by improper operation.

[0013] Preferably, a flue gas duct is connected to the top of the end of the housing away from the burner, and an air preheater is connected to the outer end of the flue gas duct.

[0014] This configuration involves connecting the flue gas duct to the top of the outer casing at the end furthest from the burner, guiding the flue gas, after heat exchange through three layers of heat exchange coils, to the air preheater. The air preheater has a vertical structure, with flue gas flowing inside the tubes and air flowing outside. The air flow is a three-pass process, where cold air is heated into hot air during the heat exchange with the high-temperature flue gas, and the hot air is introduced into the burner through the duct.

[0015] Preferably, the outer wall of the end of the housing is provided with a fire observation hole and a fire extinguishing pipe seat.

[0016] This feature includes a fire observation hole located on the outer wall of the boiler casing. Operators can observe the combustion inside the boiler through the fire observation hole and promptly detect problems such as whether the combustion is complete and whether the flame is normal. The fire extinguishing pipe socket provides an interface for connecting fire extinguishing devices in case of emergencies such as boiler fires, facilitating rapid fire suppression.

[0017] Preferably, the inner, middle, and outer heat exchange coils of the coil body are all connected in series.

[0018] In this configuration, the inner, middle, and outer heat exchange coils are all connected in series. The organic heat transfer fluid enters from one end through the inlet / outlet water pipe, flows sequentially through the inner, middle, and outer heat exchange coils, and finally exits from the other end through the inlet / outlet water pipe. This series connection ensures a continuous flow path for the organic heat transfer fluid within the coils, guaranteeing the orderly transfer of heat.

[0019] Preferably, the air preheater adopts a vertical structure, with flue gas flowing inside the pipe and air flowing outside. The air flow adopts a three-pass structure. The cold air exchanges heat with the flue gas through the air preheater, reducing the temperature of the flue gas while increasing the temperature of the cold air to generate hot air. The hot air is introduced into the burner through the air duct to improve the combustion efficiency of the combustion system.

[0020] This air preheater features a vertical three-pass structure, where flue gas flows inside the pipes and air flows outside in a three-pass manner, increasing the contact time and heat exchange area between the flue gas and air. During its flow, the cold air fully exchanges heat with the high-temperature flue gas, raising its temperature to form hot air. This hot air is then introduced into the burner through the ductwork, further increasing the air temperature for combustion.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This horizontal hot-air type organic heat carrier boiler adopts a three-pass structure design with three layers of heat exchange coils. The inner layer is the first pass, the middle layer between the inner layer and the middle layer is the second pass, and the middle layer between the outer layer and the middle layer is the third pass. The flue gas is discharged after passing through these three passes sequentially. This structure makes the flow path of the flue gas inside the boiler longer, increases the heat exchange time and contact area between the flue gas and the coils, and allows heat to be transferred more fully to the organic heat carrier, significantly improving the heat exchange efficiency.

[0023] The vertical air preheater at the tail end of the boiler has a three-pass airflow structure with flue gas flowing inside the tubes and air flowing outside. Cold air exchanges heat with the flue gas through the air preheater, lowering the flue gas temperature while raising the cold air temperature to generate hot air. After the hot air is introduced into the burner, it can make the fuel burn more completely, further improving the combustion efficiency of the combustion system.

[0024] Front and rear covers are installed at both ends of the outer casing, facilitating the installation, inspection, and maintenance of internal boiler components. A base is installed at the bottom and fixed to the foundation, making the boiler installation more stable and ensuring its stability during operation. The inner, middle, and outer heat exchange coils of the coil body are all connected in series. This series structure ensures an orderly flow path of the organic heat carrier within the coils, enabling uniform heat absorption and avoiding localized overheating or uneven heat exchange, thus guaranteeing the stability and reliability of boiler operation.

[0025] By utilizing a highly efficient heat exchange structure and air preheater to recover and reuse waste heat from flue gas, the exhaust temperature is reduced, heat waste in the flue gas is decreased, the overall energy utilization rate is improved, and energy consumption is reduced. The improved combustion efficiency ensures more complete fuel combustion, reducing emissions of pollutants such as nitrogen oxides and sulfur dioxide, meeting environmental protection requirements and demonstrating significant environmental benefits. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a top view of the structure of this utility model;

[0028] Figure 3 This is a side view of the present invention.

[0029] The meanings of the labels in the diagram are as follows:

[0030] 1. Burner; 2. Coil body; 3. Front cover; 4. Outer shell; 5. Base; 6. Foundation; 7. Inlet and outlet water pipe sockets; 8. Rear cover; 9. Explosion-proof door; 10. Smoke duct; 11. Air preheater; 14. Nameplate; 15. Warning label; 16. Observation hole; 17. Fire extinguishing pipe socket. Detailed Implementation

[0031] 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.

[0032] This utility model provides a horizontal hot air type organic heat carrier boiler, such as Figure 1 , Figure 2 As shown, the device includes an outer shell 4, with a burner 1 installed at one end of the outer shell 4. A coil body 2 is installed inside the outer shell 4. The burner head of the burner 1 is located inside one end of the coil body 2. Water inlet and outlet pipe seats 7 are installed on the outer sides of both ends of the outer shell 4, and the water inlet and outlet pipe seats 7 are connected to both ends of the coil body 2. The coil body 2 includes three layers of heat exchange coils: an inner layer, a middle layer, and an outer layer. The inner layer is the first pass, the middle layer is the second pass, and the middle layer is the third pass. After passing through the first pass, the flue gas turns back through the second pass, then turns back through the third pass, and finally is discharged.

[0033] The fuel is ignited by burner 1, and the resulting high-temperature flue gas flows through the inner heat exchange coil in the first pass, releasing heat. The flue gas then returns to the second pass between the middle and inner layers, continuing to exchange heat with the middle heat exchange coil. It then returns to the third pass between the middle and outer layers, further exchanging heat with the outer heat exchange coil before finally being discharged. This three-pass structure extends the flow path and residence time of the flue gas within the boiler, increasing the contact area and heat exchange time between the flue gas and the heat exchange coil. This significantly improves heat exchange efficiency, allowing the organic heat carrier to fully absorb the heat from the flue gas, thus enhancing the boiler's thermal efficiency and reducing energy consumption. Simultaneously, the three-layer coil design makes the boiler structure compact, achieving a large heat exchange area within a limited space.

[0034] In this embodiment, as Figure 1 , Figure 2 As shown, a front cover 3 is installed at one end of the outer casing 4, and a rear cover 8 is installed at the other end.

[0035] The front cover 3 and the rear cover 8 are respectively installed at both ends of the outer shell 4, forming a closed space that protects the internal components of the boiler and prevents external dust and debris from entering the boiler. This also facilitates inspection and maintenance of the boiler's interior. This ensures the cleanliness and normal operation of the boiler's interior, extending its service life. When inspection or maintenance of the boiler's interior is required, the front cover 3 or the rear cover 8 can be easily opened, improving maintenance efficiency.

[0036] Specifically, such as Figure 1As shown, a base 5 is installed at the bottom of the outer casing 4, and the base 5 is installed on the foundation 6.

[0037] The base 5 is installed at the bottom of the outer casing 4, providing stable support for the boiler and evenly distributing its weight to the foundation 6. The foundation 6 further enhances the stability of the support, preventing the boiler from shaking or tilting during operation. This ensures the stability and safety of the boiler during operation, reduces damage to boiler components caused by vibration or displacement, and guarantees the normal operation of the boiler.

[0038] Furthermore, such as Figure 1 , Figure 3 As shown, an explosion-proof door 9 is installed on one end of the outer casing 4, and a nameplate 14 and a warning label 15 are installed on the outer wall of the end of the outer casing 4.

[0039] An explosion-proof door 9 is installed on the exterior of one end of the outer casing 4. When an abnormal situation occurs inside the boiler, such as deflagration, causing a rapid increase in pressure, the explosion-proof door 9 will automatically open to release the pressure and prevent the boiler from exploding. The nameplate 14 displays the boiler's model, parameters, and other information, allowing users to understand the boiler's performance and usage requirements. The warning label 15 reminds operators to pay attention to relevant safety precautions to avoid safety accidents caused by improper operation. This effectively ensures the safety of the boiler and personnel, reducing safety risks. The inclusion of the nameplate 14 and warning label 15 facilitates the correct use and maintenance of the boiler, improving its safety and reliability.

[0040] Furthermore, such as Figure 1 , Figure 2 As shown, the top of the end of the outer casing 4 away from the burner 1 is connected to a flue duct 10, and the outer end of the flue duct 10 is connected to an air preheater 11.

[0041] The flue gas duct 10 is connected to the top of the end of the outer casing 4 furthest from the burner 1, guiding the flue gas, after heat exchange through three layers of heat exchange coils, to the air preheater 11. The air preheater 11 adopts a vertical structure, with flue gas flowing inside the tubes and air flowing outside. The air flow is a three-pass process, where cold air is heated into hot air during heat exchange with the high-temperature flue gas. The hot air is then introduced into the burner 1 through the duct. This fully utilizes the waste heat in the flue gas, reduces the exhaust gas temperature, and improves energy utilization. After the hot air enters the burner 1, it increases the initial combustion temperature, making the fuel combustion more complete, further improving combustion efficiency, and reducing fuel consumption and pollutant emissions.

[0042] Furthermore, such as Figure 3 As shown, the outer wall of the end of the outer casing 4 is provided with a fire observation hole 16 and a fire extinguishing pipe seat 17.

[0043] The observation port 16 is located on the outer wall of the four ends of the boiler casing. Operators can observe the combustion process inside the boiler through the observation port 16, promptly identifying issues such as incomplete combustion and abnormal flame conditions. The fire extinguishing pipe seat 17 provides an interface for connecting a fire extinguishing device in case of an emergency such as a boiler fire, facilitating rapid fire suppression. This allows operators to monitor the boiler's combustion status in real time, adjust combustion parameters promptly, and ensure normal boiler operation. In the event of a fire, it enables rapid connection of a fire extinguishing device for fire suppression, minimizing fire damage and ensuring the safe operation of the boiler.

[0044] Furthermore, the inner, middle, and outer heat exchange coils of the coil body 2 are all connected in series.

[0045] The inner, middle, and outer heat exchange coils are all connected in series. The organic heat carrier enters from the inlet / outlet pipe seat 7 at one end, flows sequentially through the inner, middle, and outer heat exchange coils, and finally flows out from the inlet / outlet pipe seat 7 at the other end. This series connection creates a continuous flow path for the organic heat carrier within the coils, ensuring orderly heat transfer. This guarantees that the organic heat carrier can absorb heat evenly, avoiding localized overheating or uneven temperature distribution, thus improving heat exchange efficiency and boiler operational stability. Simultaneously, the series structure simplifies piping connections, reducing system complexity and the failure rate.

[0046] Furthermore, the air preheater 11 adopts a vertical structure, with flue gas flowing inside the pipe and air flowing outside. The air flow adopts a three-pass structure. The cold air exchanges heat with the flue gas through the air preheater, reducing the flue gas temperature while increasing the temperature of the cold air to generate hot air. The hot air is introduced into the burner through the air duct to improve the combustion efficiency of the combustion system.

[0047] The air preheater 11 adopts a vertical three-pass structure, with flue gas flowing inside the tubes and air flowing outside in a three-pass manner, increasing the contact time and heat exchange area between the flue gas and air. During its flow, the cold air fully exchanges heat with the high-temperature flue gas, increasing its temperature to form hot air. This hot air is then introduced into the burner 1 through the duct, raising the air temperature for combustion. This further recovers waste heat from the flue gas, reduces exhaust gas temperature, and improves energy utilization. After entering the burner 1, the hot air improves combustion conditions, resulting in more complete fuel combustion, increased combustion efficiency, reduced emissions of incomplete combustion products, and lower fuel consumption, thus improving the boiler's economy and environmental performance.

[0048] In operation, the horizontal hot-air type organic heat carrier boiler of this invention first ignites the fuel through burner 1, generating high-temperature flue gas. This flue gas then undergoes a series of heat exchange processes inside the boiler, transferring heat to the organic heat carrier. Simultaneously, waste heat from the flue gas is recovered and utilized to improve energy efficiency. The specific working principle and process are as follows:

[0049] Burner 1 ignites fuels such as light diesel oil or natural gas. High-temperature flames and flue gas are ejected from the burner head of burner 1 and enter the interior of the inner layer of the coil body 2 (first pass). In the first pass, the high-temperature flue gas comes into full contact with the inner heat exchange coil and transfers heat to the organic heat carrier inside the coil through heat conduction and heat convection, thereby reducing its own temperature.

[0050] After the first pass of heat exchange, the flue gas returns to the second pass between the middle and inner layers, continuing to exchange heat with the middle layer heat exchange coils and releasing heat again. Subsequently, the flue gas returns to the third pass between the middle and outer layers, where it undergoes a final heat transfer with the outer layer heat exchange coils. Through these three passes of heat exchange, most of the heat in the flue gas is absorbed by the organic heat carrier, significantly reducing its temperature, and finally, it is discharged from the boiler through flue gas duct 10.

[0051] The organic heat transfer fluid enters the coil body 2 through the inlet / outlet water pipe seat 7 on one side of the outer shell 4. Because the inner, middle, and outer heat exchange coils are connected in series, the organic heat transfer fluid flows sequentially through these three coils, continuously absorbing heat from the flue gas during its flow, causing its temperature to rise continuously. The high-temperature organic heat transfer fluid, after absorbing heat, flows out through the inlet / outlet water pipe seat 7 at the other end, providing the necessary thermal energy for the industrial production process.

[0052] The low-temperature flue gas discharged from the boiler enters the air preheater 11 through the flue gas duct 10. The air preheater 11 adopts a vertical structure, with flue gas flowing inside the tubes and air flowing outside, forming a three-pass airflow. After entering the air preheater 11, the cold air flows outside the tubes in a three-pass manner, fully exchanging heat with the flue gas inside the tubes, absorbing the waste heat of the flue gas, and its temperature rises to form hot air. The hot air is then introduced into the burner 1 through the duct, increasing the initial combustion temperature, making subsequent fuel combustion more complete, further improving combustion efficiency, and reducing fuel consumption and pollutant emissions.

[0053] Throughout the operation, the explosion-proof door 9 monitors the internal pressure of the boiler in real time. If the pressure inside the boiler rises sharply beyond the set value due to abnormal conditions (such as deflagration), the explosion-proof door 9 automatically opens to release the pressure, preventing an explosion and ensuring the safety of equipment and personnel. Operators can observe the combustion inside the boiler through the observation port 16. If incomplete combustion or abnormal flames are detected, the operating parameters of the burner 1 can be adjusted promptly. Simultaneously, the nameplate 14 and warning labels 15 constantly remind operators to pay attention to the boiler's performance parameters and safety precautions, ensuring the correct and safe operation of the boiler. In the event of an emergency such as a fire, a fire extinguishing device can be connected through the fire extinguishing pipe socket 17 for rapid fire suppression, minimizing fire damage.

[0054] Finally, it should be noted that the electronic components in the burner 1 and other components in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order between the electrical components in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A horizontal hot air type organic heat carrier boiler, comprising an outer shell (4), characterized in that: A burner (1) is installed at one end of the outer shell (4), and a coil body (2) is provided inside the outer shell (4). The burner head of the burner (1) is located inside one end of the coil body (2). Water inlet and outlet pipe seats (7) are installed on the outer sides of both ends of the outer shell (4). The water inlet and outlet pipe seats (7) are connected to both ends of the coil body (2). The coil body (2) includes three heat exchange coils: an inner layer, a middle layer, and an outer layer. The inner layer is the first pass, the middle layer is the second pass, and the middle layer is the third pass. After passing through the first pass, the flue gas turns back through the second pass, then turns back through the third pass, and finally is discharged.

2. The horizontal hot air type organic heat carrier boiler according to claim 1, characterized in that: The outer casing (4) has a front cover (3) installed at one end and a rear cover (8) installed at the other end.

3. The horizontal hot air type organic heat carrier boiler according to claim 1, characterized in that: The bottom of the outer shell (4) is fitted with a base (5), which is mounted on a foundation (6).

4. The horizontal hot air type organic heat carrier boiler according to claim 1, characterized in that: An explosion-proof door (9) is installed on one end of the outer casing (4), and a nameplate (14) and a warning label (15) are installed on the outer wall of the end of the outer casing (4).

5. The horizontal hot air type organic heat carrier boiler according to claim 1, characterized in that: The top of the outer casing (4) away from the burner (1) is connected to a flue gas duct (10), and the outer end of the flue gas duct (10) is connected to an air preheater (11).

6. The horizontal hot air type organic heat carrier boiler according to claim 1, characterized in that: The outer wall of the outer end of the outer casing (4) is provided with a fire observation hole (16) and a fire extinguishing pipe seat (17).

7. The horizontal hot air type organic heat carrier boiler according to claim 1, characterized in that: The inner, middle and outer heat exchange coils of the coil body (2) are all connected in series.

8. The horizontal hot air type organic heat carrier boiler according to claim 5, characterized in that: The air preheater (11) adopts a vertical structure, with flue gas flowing inside the pipe and air flowing outside the pipe. The air flow adopts a three-pass structure. The cold air exchanges heat with the flue gas through the air preheater (11), reducing the flue gas temperature while increasing the temperature of the cold air to generate hot air. The hot air is introduced into the burner (1) through the air duct to improve the combustion efficiency of the combustion system.

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