A direct combustion steam boiler for straw bales

Abstract

The utility model belongs to the technical field of boiler, concretely relates to a straw bundle direct combustion steam boiler, including furnace body, the furnace body is separated and forms combustion chamber and heat exchange chamber through furnace arch in, and combustion chamber and heat exchange chamber are communicated through the flue gas inlet on the furnace arch, and the combustion chamber includes the gasification chamber and the hearth that arrange in proper order, the heat exchange chamber has the flue gas inlet at the furnace arch and the flue gas outlet at the other end of heat exchange chamber, and the flag type heating surface is arranged in the inside of heat exchange chamber, and the flag type heating surface extends from the inner wall of heat exchange chamber to the middle part of heat exchange chamber, until the flag type heating surface is located in the flue gas flow path of flue gas inlet and flue gas outlet. By setting the flag type heating surface extends from the inner wall of heat exchange chamber to the inside of heat exchange chamber, the flag type heating surface can absorb the heat of the inner wall and the internal flue gas of heat exchange chamber, can effectively reduce the exhaust temperature, improves the heat absorption efficiency to the heat of straw bundle combustion, can also improve the medium temperature in the flag type heating surface, and is convenient for the use of subsequent heat using equipment.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, specifically relating to a straw bale direct-fired steam boiler. Background Technology

[0002] A boiler is a device that collects and utilizes the internal energy (chemical energy) of fuel by burning fuel and absorbing the heat through a medium inside the boiler pipes. Existing boilers often fail to fully absorb the heat generated after fuel combustion, resulting in high flue gas temperatures, unsatisfactory heat collection efficiency, and energy waste. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a straw bale direct-fired steam boiler, including a furnace body, a furnace arch is provided in the furnace body, a combustion chamber and a heat exchange chamber are formed on both sides of the furnace arch in the furnace body, and a flue gas inlet for communicating between the combustion chamber and the heat exchange chamber is provided on the furnace arch. The combustion chamber includes a gasification chamber and a furnace arranged in sequence, with the furnace corresponding to the flue gas inlet; The heat exchange cavity has a flue gas inlet located at the furnace arch and a flue gas outlet located at one end of the heat exchange cavity away from the flue gas inlet. A flag-shaped heating surface is attached to the inner wall of the heat exchange cavity. The flag-shaped heating surface extends from the inner wall of the heat exchange cavity into the interior of the heat exchange cavity until the flag-shaped heating surface is located in the flue gas flow path between the flue gas inlet and the flue gas outlet.

[0004] Preferably, the flag-shaped heating surface includes a lower header, an upper header, and a water-cooled wall tube extending along the axis of the heat exchange cavity. The lower header is used to introduce the heat exchange medium, the upper header is used to discharge the heat exchange medium, and the water-cooled wall tube is disposed in close to the inner wall surface of the heat exchange cavity, and the water-cooled wall tube connects the lower header and the upper header. The flag-type heating surface includes a flag tube, the axis of which is U-shaped. The two supporting ends of the U-shaped flag tube are respectively connected to the two ends of the same water-cooled wall tube, and the middle connecting end of the U-shape of the flag tube extends towards the center of the heat exchange cavity.

[0005] Preferably, the flag-shaped heating surface includes a plurality of flag tubes arranged sequentially from the inside to the outside, with the inner flag tubes embedded in the gap in the middle of the U-shaped structure of the outer flag tubes.

[0006] Preferably, it also includes a boiler drum and a transition cavity located between the boiler drum and the furnace body; The boiler drum is provided with a threaded flue and a medium channel. The transition cavity is provided with a figure-eight flue and a water-cooled wall connecting pipe. The threaded flue is connected to the exhaust port through the figure-eight flue, and the medium channel is connected to the flag-shaped heating surface through the water-cooled wall connecting pipe.

[0007] Preferably, the threaded flue includes a flue gas tube bundle disposed inside the boiler drum and extending axially along the boiler drum, the inlet end of the flue gas tube bundle being connected to the figure-eight flue. The medium channel is a cylindrical cavity between the flue gas tube bundle and the inner wall of the boiler drum. The bottom of the medium channel is connected to the water-cooled wall connecting pipe, and a heat exchange medium outlet is provided at the top of the cylindrical cavity.

[0008] Preferably, the water-cooled wall connecting pipe is a transition pipe inside the transition cavity, and the two ends of the transition pipe are respectively connected to the medium channel and the flag-shaped heating surface; the figure-eight flue is a cavity between the transition pipe and the inner wall of the transition cavity, and the two ends of the figure-eight flue are respectively connected to the threaded flue and the exhaust port.

[0009] Preferably, the furnace also includes a grate feed inlet and a slag removal inlet respectively located at the beginning and end of the combustion chamber; a grate is provided at the bottom of the furnace body, the grate is connected to an external power source, and is used to transport materials along the feed inlet to the discharge outlet; the gasification chamber and the furnace are both located in the conveying path between the grate feed inlet and the slag removal inlet.

[0010] Preferably, the power source is capable of outputting positive or negative power so that the grate can reciprocate along the conveying direction.

[0011] Preferably, the height of the grate gradually decreases along the conveying direction.

[0012] The straw bale direct-fired steam boiler provided by this utility model includes a furnace body. A combustion chamber and a heat exchange chamber are formed within the furnace body by a furnace arch, and the combustion chamber and heat exchange chamber are connected by a flue gas passage on the furnace arch. The combustion chamber includes a gasification chamber and a furnace chamber arranged in sequence. The heat exchanger has a flue gas inlet located at the flue gas passage and a flue gas outlet at the other end. A flag-shaped heating surface is provided inside the heat exchange chamber, extending from the inner wall of the heat exchange chamber towards the center of the heat exchange chamber until it reaches the flue gas flow path between the flue gas inlet and the flue gas outlet. By simultaneously absorbing heat from the wall of the heat exchange chamber and the flue gas inside the heat exchange chamber through the flag-shaped heating surface, the exhaust temperature can be effectively reduced, the heat absorption efficiency after the straw bale combustion can be improved, and the temperature of the medium within the flag-shaped heating surface can also be increased, facilitating the use of subsequent heat-consuming equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the straw bale direct-fired steam boiler provided in this embodiment of the utility model; Figure 2 yes Figure 1 Sectional view of section AA; Figure 3 This is a top view of the straw bale direct-fired steam boiler provided in this embodiment of the utility model; Figure 4 This is a schematic diagram of the flag-shaped heating surface of the straw bale direct-fired steam boiler provided in this embodiment of the utility model; Figure 5 yes Figure 4 Sectional view of section AA; Figure 6 yes Figure 4 Sectional view of section BB; Figure 7 This is a schematic diagram of the fuel delivery path of the straw bale direct-fired steam boiler provided in this embodiment of the utility model; The components include: 1. Furnace body; 11. Combustion chamber; 111. Gasification chamber; 112. Furnace lining; 113. Grate feed inlet; 114. Slag removal port; 115. Grate; 12. Heat exchange chamber; 131. Front arch; 132. Middle arch; 133. Rear arch; 14. Flag-type heating surface; 141. Flag tube; 142. Lower header; 143. Upper header; 144. Water-cooled wall tube; 2. Transition chamber; 21. Water-cooled wall connecting pipe; 22. Figure-eight flue; 3. Boiler drum; 31. Medium channel; 32. Threaded smoke tube; 4. Debris breaking chamber; 41. Debris breaking roller; 5. Feeder. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0015] Figure 1 This is a schematic diagram of the overall structure of the straw bale direct-fired steam boiler provided in this embodiment of the utility model; Figure 2 yes Figure 1 Sectional view of section AA; Figure 3 This is a top view of the straw bale direct-fired steam boiler provided in this embodiment of the utility model.

[0016] like Figures 1 to 3As shown, this utility model provides a straw bale direct-fired steam boiler, including a furnace body 1, a furnace arch is provided inside the furnace body 1, a combustion chamber 11 and a heat exchange chamber 12 are formed on both sides of the furnace arch inside the furnace body 1, and a flue gas inlet is provided on the furnace arch for communication between the combustion chamber 11 and the heat exchange chamber 12; the combustion chamber 11 includes a gasification chamber 111 and a furnace chamber 112 arranged in sequence, the furnace chamber 112 is correspondingly provided with the flue gas inlet, the heat exchange chamber 12 has a flue gas inlet located at the furnace arch and a flue gas outlet at one end away from the flue gas inlet, a flag-shaped heating surface 14 is attached to the inner wall of the heat exchange chamber 12, the flag-shaped heating surface 14 extends from the inner wall of the heat exchange chamber 12 towards the center of the heat exchange chamber 12 until it extends into the flue gas flow path between the flue gas inlet and the flue gas outlet.

[0017] like Figure 1 As shown, the furnace arch includes a front arch 131, a middle arch 132, and a rear arch 133 located at the front, middle, and rear of the furnace body 1, respectively. The gaps between the front arch 131, the middle arch 132, and the rear arch 133 form the aforementioned flue gas inlets. The combustion chamber 11 located at the bottom of the furnace body 1 and the heat exchange chamber 12 located in the upper middle part of the furnace body 1 are connected through these gaps in the flue gas inlets. The material entering the combustion chamber 11 is processed in the gasification chamber 111 and then enters the furnace 112 for combustion and heat release. The generated high-temperature flue gas enters the heat exchange chamber 12 through the aforementioned flue gas inlets for heat exchange. The flag-shaped heating surface 14, which is attached to the inner wall of the cavity 12, can fully absorb the heat of the inner wall of the heat exchange cavity 12 and reduce the heat radiated from the heat exchange cavity 12 to the external system. On the flag-shaped heating surface 14, there is also a flag-shaped heating surface extending into the interior of the heat exchange cavity 12. The flag-shaped heating surface is located in the flue gas flow path surrounded by the furnace arch and the wall of the heat exchange cavity, so that the high-temperature flue gas in the furnace body 1 flows through the flag-shaped heating surface 14. The medium in the flag-shaped heating surface 14 can fully exchange heat with the high-temperature flue gas, thereby improving the boiler's energy absorption and utilization efficiency of fuel.

[0018] Figure 4 This is a schematic diagram of the flag-shaped heating surface of the straw bale direct-fired steam boiler provided in this embodiment of the utility model; Figure 5 yes Figure 4 Sectional view of section AA; Figure 6 yes Figure 4 A sectional view of section BB in the middle.

[0019] like Figures 4 to 6As shown, in one preferred embodiment, the flag-type heating surface 14 includes a lower header 142, an upper header 143, and a water-cooled wall tube 144 extending along the axial direction of the heat exchange cavity 12. The lower header 142 is used to introduce a low-temperature heat exchange medium, and the upper header 143 is used to discharge a high-temperature heat exchange medium. The water-cooled wall tube 144 is disposed in close contact with the inner wall surface of the heat exchange cavity 12 to form the aforementioned water-cooled wall in close contact with the inner wall of the heat exchange cavity 12, and the water-cooled wall tube 144 connects the lower header 142 and the upper header 143; the flag-type heating surface includes a flag tube 141, and the overall axis of the flag tube 141 is U-shaped (e.g., ...). Figure 2 As shown in the diagram, the two ends of the U-shaped flag tube 141 are respectively connected to the two ends of the same water-cooled wall tube 144, and the middle connecting end of the flag tube 141 extends towards the center of the heat exchange chamber 12. In this flag-shaped heating surface 14 structure, the low-temperature medium enters through the lower header 142 and flows through the water-cooled wall tube 144 and the flag tube 141 to the upper header 143. During its flow, it undergoes sufficient heat exchange with the inner wall surface of the heat exchange chamber 12 and the high-temperature flue gas inside the heat exchange chamber 12, which can improve the boiler's efficiency in collecting and utilizing fuel heat.

[0020] like Figure 2 as well as Figures 4 to 6 As shown, on both sides of the bottom of the inner wall of heat exchange chamber 12 (in Figure 2 Lower headers 142 are provided on both the left and right sides of the heat exchange cavity 12, and upper headers 143 are provided on both sides of the top of the inner wall of the heat exchange cavity 12. This allows water-cooled wall tubes 144 to be fitted onto both sides of the inner wall of the heat exchange cavity 12, and flag tubes 141 extending into the heat exchange cavity 12 are provided on both sides of the water-cooled wall tubes 144. This arrangement further increases the distribution range of the flag-shaped heating surface 14 within the heat exchange cavity 12, increases the contact area and contact time between the heat exchange medium within the flag-shaped heating surface 14 and the high-temperature flue gas within the heat exchange cavity 12, and improves the efficiency of fuel heat collection and utilization.

[0021] like Figure 2 and Figure 6 As shown, the flag-type heating surface includes multiple flag tubes 141 arranged sequentially from the inside to the outside. The inner flag tube 141 is embedded in the gap in the middle of the U-shaped structure of the outer flag tube 141. The multiple flag tubes 141 are nested in layers to form a larger and denser "flag", which can increase the amount of medium that the flag-type heating surface can hold, thereby increasing the total heat of the flue gas that the flag-type heating surface can absorb, and further improving the efficiency of collecting and utilizing fuel heat.

[0022] like Figure 1 and Figure 2As shown, in one preferred embodiment, the straw bale direct-fired steam boiler provided by this utility model further includes a boiler drum 3 and a transition cavity 2 located between the boiler drum 3 and the furnace body 1. The boiler drum 3 is provided with a threaded flue pipe 32 and a medium channel 31. The transition cavity 2 is provided with a figure-eight flue 22 and a water-cooled wall connecting pipe 21. The threaded flue pipe 32 connects to the exhaust port through the figure-eight flue 22, and the medium channel 31 connects to the water outlet of the flag-shaped heating surface 14 through the water-cooled wall connecting pipe 21. By setting the boiler drum 3 and the transition cavity 2, the cold water discharged from the flag-shaped heating surface 14 and the flue gas discharged from the exhaust port can undergo heat exchange again in the transition cavity 2 and the boiler drum 3, which can increase the heat exchange time between the heat exchange medium and the flue gas, making the heat exchange more complete.

[0023] like Figure 1 and Figure 2 As shown, in one preferred embodiment, the threaded flue duct 32 includes a flue gas tube bundle extending axially within the boiler drum 3, with the inlet end of the flue gas tube bundle connected to the figure-eight flue 22. The medium channel 31 is a cylindrical cavity between the flue gas tube bundle and the inner wall of the boiler drum. An opening for the heat exchange medium to enter the water-cooled wall connecting pipe 21 is provided at the bottom of this cavity, and a heat exchange medium outlet is provided at the top of the cavity. The flow direction of the heat exchange medium within the cavity is generally upward, which is more conducive to the discharge of the heated and gaseous medium (e.g., when the medium is cooling water, it becomes high-temperature water vapor after heating) through the top of the cavity. The heat exchange medium outlet can be connected to a heat-using terminal or other equipment, which will not be elaborated here.

[0024] The water-cooled wall connecting pipe 21 is a transition pipe within the transition cavity 2, with its two ends connected to the medium channel 31 and the flag-shaped heating surface 14, respectively; the figure-eight flue 22 is the cavity between the transition pipe and the inner wall of the transition cavity 2, with its two ends connected to the threaded flue pipe 32 and the exhaust port, respectively. For example... Figure 1 and Figure 2 As shown, the upper header 143 of the flag-type heating surface 14 is connected to the bottom end of the boiler drum 3 through the water-cooled wall connecting pipe 21. The flue gas outlet is located at the top right end of the combustion chamber 12. The combustion chamber 12 and the transition chamber 2 are connected through the flue gas outlet. The left opening of the transition chamber 2 is connected to the threaded flue gas pipe 32 at the end of the boiler drum 3. The threaded flue gas pipe 32 extends from the left end to the right end of the boiler drum 3. The flue gas flows in an S-shape in the heat exchange chamber 12, the transition chamber 2 and the threaded flue gas pipe 32, which can increase the heat exchange time between the heat exchange medium and the flue gas, and make the heat exchange more complete.

[0025] Figure 7 This is a schematic diagram of the fuel transport and circulation of a straw bale direct-fired steam boiler provided in this embodiment of the utility model.

[0026] like Figure 1 and Figure 7As shown, in one preferred embodiment, a grate inlet 113 and a slag removal port 114 are respectively provided at the beginning and end of the combustion chamber 11. A grate 115 is provided at the bottom of the furnace body 1. The grate 115 is connected to a power source to transport materials along the grate inlet 113 to the slag removal port 114, so that the materials pass through the gasification chamber and the furnace respectively. The materials entering through the grate inlet 113 are ignited in the furnace after gasification. The waste residue after combustion is discharged from the boiler through the slag removal port 114, which can improve the automation level of the boiler and improve the use effect.

[0027] Furthermore, the power source can output positive or negative power to make the grate 115 drive the material to reciprocate within the furnace 112, so that the material can burn more completely and that the combustible part of the material can burn and release heat as much as possible, thus avoiding energy waste.

[0028] like Figure 1 As shown, in one preferred embodiment, the height of the grate 115 gradually decreases along the conveying direction. In this way, the high-temperature flue gas generated by the fuel burning on the grate 115 and the high-temperature air radiated by it move from the slag removal port 114 at the lower position of the grate 115 to the grate feed port 113 under the drive of their own upward movement, which can reduce the discharge temperature and improve the heat utilization efficiency.

[0029] like Figure 7 As shown, in one preferred embodiment, the straw bale direct-fired steam boiler provided by this utility model is provided with a bale-breaking chamber 4 at the grate inlet 113. The bale-breaking chamber 4 is correspondingly arranged with the feeding machine 5. The feeding machine 5 can continuously convey straw bale material to the bale-breaking chamber 4 and the grate inlet 113. The bale-breaking chamber 4 is provided with a bale-breaking roller 41 for crushing the straw bale, which is more conducive to its subsequent gasification and complete combustion.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered by the claims of this utility model.

Claims

1. A straight combustion steam boiler of straw bales, characterized in that, The furnace includes a furnace body, a furnace arch is provided inside the furnace body, a combustion chamber and a heat exchange chamber are formed on both sides of the furnace arch inside the furnace body, and a flue gas inlet for communicating between the combustion chamber and the heat exchange chamber is provided on the furnace arch; The combustion chamber includes a gasification chamber and a furnace arranged in sequence, with the furnace corresponding to the flue gas inlet; The heat exchange cavity has a flue gas inlet located at the furnace arch and a flue gas outlet located at one end of the heat exchange cavity away from the flue gas inlet. A flag-shaped heating surface is attached to the inner wall of the heat exchange cavity. The flag-shaped heating surface extends from the inner wall of the heat exchange cavity into the interior of the heat exchange cavity until the flag-shaped heating surface is located in the flue gas flow path between the flue gas inlet and the flue gas outlet.

2. The straight burning steam boiler of straw bale according to claim 1, characterized in that, The flag-shaped heating surface includes a lower header, an upper header, and a water-cooled wall tube extending along the axis of the heat exchange cavity. The lower header is used to introduce the heat exchange medium, the upper header is used to discharge the heat exchange medium, and the water-cooled wall tube is arranged to fit the inner wall surface of the heat exchange cavity, and the water-cooled wall tube connects the lower header and the upper header. The flag-type heating surface includes a flag tube, the axis of which is U-shaped. The two supporting ends of the U-shaped flag tube are respectively connected to the two ends of the same water-cooled wall tube, and the middle connecting end of the U-shape of the flag tube extends towards the center of the heat exchange cavity.

3. The straight burning steam boiler of straw bale according to claim 2, characterized in that, The flag-shaped heating surface includes a plurality of flag tubes arranged sequentially from the inside to the outside, with the inner flag tubes embedded in the gap in the middle of the U-shaped structure of the outer flag tubes.

4. The straight burning steam boiler of straw bale according to claim 1, characterized by, It also includes a boiler drum and a transition cavity located between the boiler drum and the furnace body; The boiler drum is provided with a threaded flue and a medium channel. The transition cavity is provided with a figure-eight flue and a water-cooled wall connecting pipe. The threaded flue is connected to the exhaust port through the figure-eight flue, and the medium channel is connected to the flag-shaped heating surface through the water-cooled wall connecting pipe.

5. The straight burning steam boiler of straw bale according to claim 4, characterized by, The threaded flue includes a flue gas tube bundle that extends axially along the boiler drum inside the boiler drum, and the inlet end of the flue gas tube bundle is connected to the figure-eight flue. The medium channel is a cylindrical cavity between the flue gas tube bundle and the inner wall of the boiler drum. The bottom of the medium channel is connected to the water-cooled wall connecting pipe, and a heat exchange medium outlet is provided at the top of the cylindrical cavity.

6. The straight burning steam boiler of straw bale according to claim 5, characterized by, The water-cooled wall connecting pipe is a transition pipe inside the transition cavity, and the two ends of the transition pipe are respectively connected to the medium channel and the flag-shaped heating surface; the figure-eight flue is a cavity between the transition pipe and the inner wall of the transition cavity, and the two ends of the figure-eight flue are respectively connected to the threaded flue and the exhaust port.

7. The straight burning steam boiler of straw bale according to claim 1, characterized by, It also includes a grate feed port and a slag removal port respectively located at the beginning and end of the combustion chamber; a grate is provided at the bottom of the furnace body, the grate is connected to an external power source, and is used to transport materials along the feed port to the discharge port. The gasification chamber and the furnace are both located in the conveying path between the grate feed port and the slag removal port.

8. The straight burning steam boiler of straw bales according to claim 7, characterized in that, The power source can output positive or negative power so that the grate can reciprocate along the conveying direction.

9. The straight burning steam boiler of straw bales according to claim 8, characterized in that, The height of the grate gradually decreases along the conveying direction.

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