Double-face water-cooled combustion water fire tube boiler

Abstract

This invention discloses a double-sided water-cooled combustion water-tube boiler, comprising a boiler drum, with an upper drum and a lower drum symmetrically arranged inside the boiler drum. The upper drum and the lower drum are connected by a primary convection pipe and a secondary convection pipe. A gas equalization chamber is connected to one side of the upper drum and the lower drum, and an economizer and a condenser are connected sequentially to the other side. The end of the condenser is provided with a flue pipe. The top of the upper drum is provided with a water supply pipe seat, a steam outlet, a safety valve seat, and a pressure gauge seat. The end of the lower drum is provided with a second drain pipe. Both the upper drum and the lower drum are provided with combustion chambers. The flue gas generated in the combustion chamber passes sequentially through the primary convection pipe, the secondary convection pipe, the economizer, and the condenser, and is finally discharged from the flue pipe. This double-sided water-cooled combustion water-tube boiler can reduce the furnace volume, thereby lowering the temperature. It can not only save boiler costs but also reduce NOx generation. In use, it can efficiently exchange heat to reduce the flue gas temperature, making it suitable for widespread use.

Description

Technical Field

[0001] This invention relates to the field of boiler equipment technology, and in particular to a double-sided water-cooled combustion water-fire tube boiler. Background Technology

[0002] Boilers, as core energy supply equipment in modern industrial production and daily life, possess irreplaceable fundamental significance. In the industrial sector, boilers provide stable and reliable steam and heat power for industries such as power generation, chemical engineering, metallurgy, textiles, and food processing, ensuring the continuous operation of industrial production. In the civilian sector, boilers are key heat sources for centralized heating and hot water supply (such as in hotels, hospitals, and schools), directly impacting people's living comfort and convenience. Furthermore, with technological advancements, efficient and low-emission boiler technology is equally crucial for conserving fossil energy consumption and reducing pollutant emissions. In short, boilers are vital infrastructure supporting social operation, ensuring people's livelihoods, and driving industrial development.

[0003] Currently, traditional diffusion burner boilers face several pressing issues in actual operation. Firstly, their furnace volume is typically large, increasing manufacturing costs and floor space requirements. This also makes effective temperature control within the furnace difficult, easily leading to the formation of localized high-temperature zones. High-temperature environments not only accelerate the aging and damage of the furnace wall materials, shortening the boiler's lifespan, but more importantly, high temperatures are a significant factor in the formation of nitrogen oxides (NOx), a major air pollutant that poses a significant threat to the environment and human health. Secondly, the flue gas flow design within the boiler is not optimized, resulting in some heat not being fully absorbed by the working fluid before being discharged with the flue gas, leading to energy waste. Furthermore, the high exhaust gas temperature increases the difficulty and cost of subsequent treatment.

[0004] Therefore, there is an urgent need for a boiler that can suppress NOx formation and efficiently exchange heat to reduce flue gas temperature. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems by providing a double-sided water-cooled combustion water-tube boiler that can reduce the furnace volume, thereby lowering the temperature, saving boiler costs, reducing NOx generation, and efficiently exchanging heat to reduce flue gas temperature during use.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a double-sided water-cooled combustion water-tube boiler, comprising a boiler drum, an upper boiler drum and a lower boiler drum symmetrically arranged inside the boiler drum, the upper boiler drum and the lower boiler drum being connected by a primary convection pipe and a secondary convection pipe, a gas equalization chamber being connected to one side of the upper boiler drum and a gas economizer and a condenser being connected sequentially to the other side, a flue gas exhaust pipe being provided at the end of the condenser, a water supply pipe seat, a steam outlet, a safety valve seat and a pressure gauge seat being provided at the top of the upper boiler drum, a second drain pipe being provided at the end of the lower boiler drum, a combustion chamber being provided inside both the upper boiler drum and the lower boiler drum, the flue gas generated in the combustion chamber passing sequentially through the primary convection pipe, the secondary convection pipe, the gas economizer and the condenser, and finally being discharged from the flue gas exhaust pipe.

[0007] Preferably, the boiler drum, the economizer, and the condenser are connected by a flange. The condenser is provided with a water inlet and a drain outlet. The economizer is provided with a return water inlet and a return water outlet. The drain outlet is connected to the return water inlet, and the return water outlet is connected to the water supply pipe seat of the upper boiler drum.

[0008] Preferably, the condenser is provided with a U-shaped circulating water pipe, with the water inlet and outlet located at both ends of the circulating water pipe, and a condenser pipe is provided at the bottom of the condenser.

[0009] Preferably, the energy saver has multiple fire tubes arranged horizontally inside, one end of each fire tube is connected to the boiler drum and the other end is connected to the condenser, and the bottom of the energy saver is also provided with a drain pipe.

[0010] Preferably, the internal array of the fire tube is provided with three sets of finned plates, with a gap between each pair of adjacent finned plates. The finned plates include multiple fins, which are fixed to the inner wall of the fire tube, and a gap is left between each pair of adjacent fins.

[0011] Preferably, the gas distribution chamber has an air distribution plate on the side near the combustion chamber, and a water-cooling pipe and a corrugated plate are provided on one side of the air distribution plate. The water-cooling pipe and the corrugated plate are spaced apart and fixedly connected. The air distribution plate is fixed to the water-cooling pipe by connecting bolts.

[0012] Preferably, there is no contact between two adjacent irregularly shaped corrugated plates.

[0013] Preferably, the two sides of the secondary convection tube are fixed with baffles along its length, and the baffles between two adjacent secondary convection tubes do not contact each other.

[0014] Preferably, a membrane wall is provided around the upper and lower drums, the membrane wall comprising a plurality of vertically arranged water pipes, with a steel plate fixed between each pair of adjacent water pipes.

[0015] Preferably, it also includes a blower, a makeup air box, and a filter for gas. The blower is connected to the makeup air box. The end of the makeup air box is connected in sequence to a variable diameter cylinder, a mixer, and a cyclone separator. One end of the filter is connected to a gas pipe, and the other end is connected to a pressure reducing valve assembly. The gas and air are mixed in the mixer and then delivered to the gas equalization chamber.

[0016] This invention discloses a double-sided water-cooled combustion water-tube boiler, comprising a boiler drum, with an upper drum and a lower drum symmetrically arranged inside the boiler drum. The upper drum and the lower drum are connected by a primary convection pipe and a secondary convection pipe. A gas equalization chamber is connected to one side of the upper drum and the lower drum, and an economizer and a condenser are connected sequentially to the other side. The end of the condenser is provided with a flue pipe. The top of the upper drum is provided with a water supply pipe seat, a steam outlet, a safety valve seat, and a pressure gauge seat. The end of the lower drum is provided with a second drain pipe. Both the upper drum and the lower drum are provided with combustion chambers. The flue gas generated in the combustion chamber passes sequentially through the primary convection pipe, the secondary convection pipe, the economizer, and the condenser, and is finally discharged from the flue pipe. Compared with the prior art, it can reduce the furnace volume, thereby lowering the temperature. This not only saves boiler costs but also reduces NOx generation. In addition, it can achieve the beneficial effect of efficient heat exchange and reducing flue gas temperature during use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a double-sided water-cooled combustion water-tube boiler according to the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of a double-sided water-cooled combustion water-tube boiler according to the present invention. Figure 2 .

[0019] Figure 3 This is a schematic diagram of the upper and lower drums in a double-sided water-cooled combustion water-fire tube boiler according to the present invention.

[0020] Figure 4 For the present invention Figure 1 A magnified schematic diagram of the central part of the structure.

[0021] Figure 5 For the present invention Figure 2 A partially enlarged structural diagram.

[0022] Figure 6 For the present invention Figure 5 A magnified structural diagram of point A in the middle.

[0023] Figure 7 This is a schematic cross-sectional view of the fire tube in a double-sided water-cooled combustion water-fire tube boiler according to the present invention.

[0024] Figure 8 This is a schematic diagram of the irregular corrugated plate structure in a double-sided water-cooled combustion water-fire tube boiler according to the present invention.

[0025] In the diagram: 1. Fan; 2. Air distribution box; 21. Variable diameter section; 22. Mixer; 23. Cyclone separator; 24. Gas equalization chamber; 3. Filter; 4. Pressure reducing valve assembly; 5. Combustion chamber; 51. Air distribution plate; 52. Water cooling pipe; 53. Irregularly shaped corrugated plate; 54. Connecting bolt; 55. Membrane wall; 56. Primary convection pipe; 57. Secondary convection pipe; 6. Upper boiler drum; 61. Water supply pipe seat; 6 2. Steam outlet; 63. Safety valve seat; 64. Pressure gauge seat; 7. Boiler drum; 71. Drain pipe II; 8. Eco-friendly device; 81. Return water inlet; 82. Return water outlet; 83. Drain pipe I; 84. Fire tube; 841. Fins; 842. Gap; 9. Condenser; 91. Water inlet; 92. Drain outlet; 93. Circulating water pipe; 94. Condenser tube; 10. Flue pipe. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0027] Please refer to Figure 1-8 A double-sided water-cooled combustion water-tube boiler includes a boiler drum, with an upper drum 6 and a lower drum 7 symmetrically arranged inside the boiler drum. The upper drum 6 and the lower drum 7 are connected by a primary convection pipe 56 and a secondary convection pipe 57. A gas equalization chamber 24 is connected to one side of the upper drum 6 and the lower drum 7, and an economizer 8 and a condenser 9 are connected sequentially to the other side. A flue gas pipe 10 is provided at the end of the condenser 9. A water supply pipe seat 61, a steam outlet 62, a safety valve seat 63, and a pressure gauge seat 64 are provided at the top of the upper drum 6. A drain pipe 71 is provided at the end of the lower drum 7. A combustion chamber 5 is provided inside both the upper drum 6 and the lower drum 7. The flue gas generated in the combustion chamber 5 passes sequentially through the primary convection pipe 56, the secondary convection pipe 57, the economizer 8, and the condenser 9, and is finally discharged from the flue gas pipe 10.

[0028] In actual operation, the boiler drum, economizer 8, and condenser 9 are tightly connected via flanges. This connection method not only facilitates installation and subsequent maintenance but also effectively ensures the overall system's airtightness, preventing flue gas leakage. The condenser 9 is equipped with a water inlet 91 and a drain outlet 92, and its interior features a U-shaped circulating water pipe 93. The water inlet 91 and drain outlet 92 are connected to the two ends of the circulating water pipe 93, respectively. This design significantly increases the flow path and heat exchange time of the cooling water within the condenser 9, improving condensation efficiency. Simultaneously, a condenser pipe 94 is located at the bottom of the condenser 9 to collect condensate generated during the condensation process. The economizer 8 is equipped with a return water inlet 81 and a return water outlet 82. The drain outlet 92 of the condenser 9 is connected to the return water inlet 81 of the economizer 8, allowing the cooling water flowing out of the condenser 9, which has absorbed some of the waste heat from the flue gas, to enter the economizer 8 for further utilization. The return water outlet 82 of the economizer 8 is connected to the water supply pipe seat 61 of the upper boiler drum 6, sending the preheated water into the boiler drum. This realizes the recycling of water resources and the cascade recovery of heat, effectively improving the overall thermal efficiency of the boiler. Furthermore, the symmetrical double-sided arrangement of the upper boiler drum 6 and the lower boiler drum 7 results in a smaller furnace and lower temperature compared to a diffusion burner, which not only saves boiler costs but also reduces NOx generation, making it energy-saving and environmentally friendly.

[0029] In other words, external tap water first enters the condenser 9 through the water inlet 91, and then the outer wall of the circulating water pipe 93 contacts the end flue gas, adsorbing the residual heat of the end flue gas and further reducing the heat emitted by the flue gas. Next, the initially heated water enters the economizer at the return water inlet 81; since the economizer 8 is closer to the boiler, the internal flue gas temperature is higher than the temperature inside the condenser 9, so the water flow can be continuously heated in the economizer 8 to further increase the water temperature, while the flue gas temperature can be reduced to increase the heat exchange effect. The return water outlet 82 is connected to the water supply pipe seat 61, so the water that has been heated twice is delivered into the upper drum 6 at the return water outlet 82. Since the upper drum 6 and the lower drum 7 are connected by the primary convection pipe 56 and the secondary convection pipe 57, the water in the upper drum 6 will flow into the lower drum 7. The primary convection pipe 56 and the secondary convection pipe 57 are located in the combustion chamber 5, so the temperature here is the highest, which can heat the water in the primary convection pipe 56 and the secondary convection pipe 57. The steam generated after heating is discharged from the steam outlet 62. The flue gas passes through the circulating water pipe 93 and the fire pipe for heat exchange and optimization of the flue gas flow, which can greatly improve the heat exchange effect and make the exhaust gas temperature lower.

[0030] Therefore, in this invention, low-temperature water enters the condenser 9 for heat exchange. After the temperature rises, it enters the energy-saving device 8 for heat exchange again, and the temperature rises further to become high-temperature water. The high-temperature water finally enters the lower drum 7 and is heated by the first-stage convection tube 56 and the second-stage convection tube 57 before entering the upper drum 6 to generate saturated steam. The saturated steam is discharged through the steam outlet and supplied to the user.

[0031] In this embodiment, after the condenser 9 heats up, it can first enter the insulation water tank under the action of the circulating pump. The water in the insulation water tank enters the energy saver through the water supply pump, which can improve the insulation performance and avoid heat loss.

[0032] The flame generated by the water-cooled burner in combustion chamber 5 is transformed into high-temperature flue gas after heat exchange through the first-stage convection tube 56. The high-temperature flue gas is then cooled by heat exchange through the second-stage convection tube 57. The resulting flue gas enters the economizer to further reduce its temperature. The low-temperature flue gas then enters the condenser for full heat exchange before being discharged into the atmosphere.

[0033] The economizer 8 has multiple horizontally arranged fire tubes 84, which are surrounded by water. One end of each fire tube 84 is connected to the boiler drum, and the other end is connected to the condenser 9. Flue gas exchanges heat with the return water inside the economizer 8 as it passes through the fire tubes 84. The internal array of each fire tube 84 has three sets of finned plates, with a gap 842 between each pair of adjacent finned plates. Each finned plate consists of multiple fins 841 fixed to the inner wall of the fire tube 84, with a gap 842 between each pair of adjacent fins 841. The arrangement of these fins 841 significantly increases the contact area between the flue gas and the inner wall of the fire tube 84. Simultaneously, the gaps 842 ensure smooth flue gas flow, avoiding local stagnation, thereby enhancing heat transfer and reducing flue gas temperature. This allows the economizer 8 to more effectively recover heat from the flue gas. Furthermore, the bottom of the economizer 8 is equipped with a drain pipe 83 for periodically removing impurities and dirt deposited at the bottom of the economizer 8, ensuring stable operation.

[0034] The uniform air chamber 24 has an air distribution plate 51 on the side near the combustion chamber 5. A water-cooling pipe 52 and a corrugated plate 53 are installed on one side of the air distribution plate 51. The water-cooling pipe 52 and the corrugated plate 53 are spaced apart and fixedly connected by welding or other methods. The air distribution plate 51 is fixed to the water-cooling pipe 52 by connecting bolts 54. The special structure of the corrugated plate 53 can turbulently and evenly distribute the air-fuel mixture entering the combustion chamber 5, making combustion more complete and stable. At the same time, adjacent corrugated plates 53 do not contact each other, leaving a certain space to facilitate airflow and heat exchange. The water-cooling pipe 52 can absorb some heat to cool the air distribution plate 51 and its surrounding area, preventing damage due to high temperatures.

[0035] The two sides of the secondary convection tube 57 are fixed with baffles along its length, and the baffles between two adjacent secondary convection tubes 57 do not contact each other. These baffles can change the flow direction and velocity of flue gas in the region of the secondary convection tube 57, increase the contact time and contact area between the flue gas and the secondary convection tube 57, thereby improving the efficiency of convective heat transfer and further recovering heat from the flue gas.

[0036] The upper drum 6 and the lower drum 7 are also surrounded by membrane walls 55, which consist of multiple vertically arranged water pipes and steel plates fixed between each pair of adjacent water pipes. This structure not only has good sealing performance, isolating the combustion chamber 5 from the external environment and reducing heat loss, but also can withstand high pressure and temperature. At the same time, it is cooled by water in the water pipes, protecting the safety of the boiler body structure and improving the overall strength and service life of the boiler.

[0037] The boiler also includes a blower 1, a makeup air box 2, and a filter 3 for the combustion gas. The blower 1 is connected to the makeup air box 2, providing the necessary air for combustion. A reducing cylinder 21, a mixer 22, and a cyclone separator 23 are sequentially connected to the end of the makeup air box 2. One end of the filter 3 is connected to the combustion gas pipe to filter impurities in the combustion gas, and the other end is connected to a pressure reducing valve assembly 4 to regulate the combustion gas pressure. After filtration and pressure reduction, the combustion gas enters the mixer 22, where it is thoroughly mixed with the air from the makeup air box 2 to form a homogeneous combustible mixture. This mixture is then sent through the cyclone separator 23 into the equalization chamber 24, and finally into the combustion chamber 5 for combustion. The cyclone separator 23 enables the mixture to rotate, enhancing the stability and completeness of combustion.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A double-faced water-cooled combustion water-tube boiler, characterized by, The system includes a boiler drum, within which an upper boiler drum and a lower boiler drum are symmetrically arranged. The upper and lower boiler drums are connected by a primary convection pipe and a secondary convection pipe. A gas equalization chamber is connected to one side of each boiler drum, and an energy-saving device and a condenser are connected sequentially to the other side. The end of the condenser is equipped with a flue pipe. The top of the upper boiler drum is equipped with a water supply pipe seat, a steam outlet, a safety valve seat, and a pressure gauge seat. The end of the lower boiler drum is equipped with a second drain pipe. Both the upper and lower boiler drums are equipped with combustion chambers. The flue gas generated in the combustion chambers passes sequentially through the primary convection pipe, the secondary convection pipe, the energy-saving device, and the condenser, and is finally discharged from the flue pipe.

2. The double-faced water-cooled fired water-tube boiler according to claim 1, characterized in that, The boiler drum, economizer, and condenser are connected by a flange. The condenser is equipped with a water inlet and a drain outlet. The economizer is equipped with a return water inlet and a return water outlet. The drain outlet is connected to the return water inlet, and the return water outlet is connected to the water supply pipe seat of the upper boiler drum.

3. The double-faced water-cooled fired water-tube boiler according to claim 2, characterized in that, The condenser is equipped with a U-shaped circulating water pipe, with the water inlet and outlet located at both ends of the circulating water pipe, and a condenser pipe located at the bottom of the condenser.

4. The double-faced water-cooled fired water-tube boiler according to claim 2, characterized in that, The energy saver has multiple fire tubes arranged horizontally inside. One end of each fire tube is connected to the boiler drum, and the other end is connected to the condenser. A drain pipe is also provided at the bottom of the energy saver.

5. The double-sided water-cooled combustion water-tube boiler according to claim 4, characterized in that, The fire tube has three sets of finned plates inside, with a gap between each pair of adjacent finned plates. Each finned plate includes multiple fins, which are fixed to the inner wall of the fire tube, and a gap is left between each pair of adjacent fins.

6. The double-sided water-cooled combustion water-tube boiler according to claim 1, characterized in that, The gas distribution chamber has an air distribution plate on the side near the combustion chamber. A water-cooling pipe and a corrugated plate are provided on one side of the air distribution plate. The water-cooling pipe and the corrugated plate are spaced apart and fixedly connected. The air distribution plate is fixed to the water-cooling pipe by connecting bolts.

7. The double-sided water-cooled combustion water-tube boiler according to claim 6, characterized in that, The two adjacent irregularly shaped corrugated sheets do not contact each other.

8. The double-sided water-cooled combustion water-tube boiler according to claim 1, characterized in that, The two sides of the secondary convection tube are fixed with baffle wing plates along its own length, and the baffle wing plates between two adjacent secondary convection tubes do not contact each other.

9. The double-sided water-cooled combustion water-tube boiler according to claim 1, characterized in that, The upper and lower drums are also surrounded by a membrane wall, which includes multiple vertically arranged water pipes, with a steel plate fixed between each pair of adjacent water pipes.

10. The double-sided water-cooled combustion water-tube boiler according to claim 1, characterized in that, It also includes a fan, a makeup air box, and a filter for gas. The fan is connected to the makeup air box. The end of the makeup air box is connected in sequence to a variable diameter cylinder, a mixer, and a cyclone separator. One end of the filter is connected to a gas pipe, and the other end is connected to a pressure reducing valve assembly. The gas and air are mixed in the mixer and then delivered to the gas equalization chamber.

Images