Biomass steam boiler with threaded smoke tube and arched tube plate structure

Abstract

The utility model relates to the technical field of boilers, in particular to a biomass steam boiler with a threaded smoke tube and arched tube plate structure, which comprises a boiler barrel, a hearth mounted at the bottom of the boiler barrel, a hopper mounted at one end of the hearth, a chain grate mounted at the bottom of the hearth, and a plurality of groups of horizontal threaded smoke tubes arranged inside the boiler barrel. A front smoke box is arranged at one end of the boiler barrel, a smoke exhaust pipe is arranged at the other end of the boiler barrel, one end of each threaded smoke pipe is communicated with the front smoke box, the other end of each threaded smoke pipe is communicated with the smoke exhaust pipe, and each threaded smoke pipe is divided into three paths including the first path, the second path and the third path which are sequentially connected. And the first stroke, the second stroke and the third stroke form three flue gas return channels. According to the biomass steam boiler with the threaded smoke tube and the arched tube plate structure, the flowing path of smoke is optimized, and the utilization rate of the smoke is increased. Flue gas is turned back by three paths, and each path is in full contact with the inner wall of the boiler, so that heat exchange is enhanced, and heat loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a biomass steam boiler with a threaded smoke tube and an arched tube plate structure. Background Art

[0002] Traditional biomass steam boilers usually have the problem of low flue gas utilization, which not only leads to energy waste but also increases environmental pollution. In order to improve the utilization of flue gas, many researchers are committed to improving the structure and design of boilers.

[0003] Although there have been some improvements, there are still many shortcomings, such as the instability of flue gas flow, heat loss, short distance of flue pipe, and insufficient heat exchange between flue gas and boiler drum. Therefore, the development of a new type of biomass steam boiler that can effectively use threaded flue pipes and arched tube sheet structure is the focus of current research. Utility Model Content

[0004] The utility model aims to provide a biomass steam boiler with a threaded smoke tube and an arched tube plate structure to solve the problems of instability of smoke flow, heat loss, short distance of the smoke tube, and insufficient heat exchange between the smoke and the boiler drum proposed in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a biomass steam boiler with a threaded smoke pipe and an arched tube plate structure, comprising a boiler drum, a furnace installed at the bottom of the boiler drum, a hopper installed at one end of the furnace, a chain grate installed at the bottom of the furnace, a plurality of horizontal groups of threaded smoke pipes are arranged inside the boiler drum, a front smoke box is arranged at one end of the boiler drum, and a smoke exhaust pipe is arranged at the other end of the boiler drum, one end of the threaded smoke pipe is connected to the front smoke box, and the other end of the threaded smoke pipe is connected to the smoke exhaust pipe, each of the threaded smoke pipes is divided into three courses, namely a first course, a second course and a third course connected in sequence, and the first course, the second course and the third course form three smoke return channels.

[0006] Preferably, a steam-water separator is installed above the interior of the boiler drum, and a main steam valve is installed on the top of the steam-water separator.

[0007] Preferably, a front arch is arranged inside one end of the furnace, and a rear arch is arranged inside the other end of the furnace.

[0008] Preferably, a blast inlet is provided at one end of the chain grate.

[0009] Preferably, an economizer is installed at the outer end of the smoke exhaust pipe, and a chimney is installed at the outer end of the economizer.

[0010] Preferably, a slag discharger is installed on the outside of one side of the furnace.

[0011] Preferably, the outer wall of the threaded smoke pipe is provided with a thread groove.

[0012] Preferably, a platform ladder is installed on one side of the top of the boiler drum.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The biomass steam boiler with the threaded smoke pipe and arched tube sheet structure optimizes the flow path of the flue gas and improves the utilization rate of the flue gas. The flue gas is fully in contact with the inner wall of the boiler after three turns, which enhances the heat exchange and reduces the heat loss. The design of the front arch and the rear arch enhances the stability of the flame in the furnace, which is conducive to the full combustion of biomass and improves the combustion efficiency. The configuration of the chain grate enables the air supply to be reasonably controlled, which helps to maintain a stable combustion state. The design of the blast inlet further enhances the oxygen supply in the furnace and helps to improve the combustion efficiency. The installation of the economizer reduces the heat loss of the exhaust and improves the recovery rate of heat energy. The design of the chimney makes the exhaust smoother and reduces the instability of the flue gas flow. The setting of the slag discharger makes it easier to clean the furnace and improves the operating efficiency of the boiler. The design of the threaded groove increases the outer wall area of ​​the smoke pipe, enhances the heat exchange between the smoke and the tube wall, and improves the utilization rate of heat energy. The setting of the platform escalator facilitates the maintenance and overhaul of the boiler by the operator and improves the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a side structural schematic diagram of the utility model;

[0017] Figure 3 It is a schematic diagram of the top view structure of the utility model;

[0018] Figure 4 It is a structural schematic diagram of the threaded smoke pipe of the utility model.

[0019] The meaning of each number in the figure is:

[0020] 1. Boiler drum; 11. Threaded smoke pipe; 111. First stage; 112. Second stage; 113. Third stage; 114. Threaded groove; 12. Steam-water separator; 13. Main steam valve; 14. Water-cooled wall; 2. Furnace; 21. Front arch; 22. Rear arch; 3. Chain grate; 31. Blast inlet; 4. Hopper; 5. Front smoke box; 6. Smoke exhaust pipe; 7. Economizer; 8. Chimney; 9. Slag discharger; 10. Platform escalator. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The utility model provides a biomass steam boiler with a threaded smoke tube and an arched tube plate structure, such as Figure 1-Figure 4 As shown, it includes a boiler drum 1, a furnace 2 is installed at the bottom of the boiler drum 1, a hopper 4 is installed at one end of the furnace 2, a chain grate 3 is installed at the bottom of the furnace 2, a water-cooled wall 14 is installed on the inner wall of the boiler drum 1, and multiple groups of horizontal threaded smoke pipes 11 are arranged inside the boiler drum 1. A front smoke box 5 is arranged at one end of the boiler drum 1, and a smoke exhaust pipe 6 is arranged at the other end of the boiler drum 1. One end of the threaded smoke pipe 11 is connected with the front smoke box 5, and the other end of the threaded smoke pipe 11 is connected with the smoke exhaust pipe 6. Each threaded smoke pipe 11 is divided into three courses, which are a first course 111, a second course 112 and a third course 113 connected in sequence. The first course 111, the second course 112 and the third course 113 form three smoke return channels to improve the heat exchange efficiency between the smoke and water.

[0023] In this embodiment, a steam-water separator 12 is installed above the interior of the drum 1, and a main steam valve 13 is installed on the top of the steam-water separator 12 for gas discharge.

[0024] Specifically, a front arch 21 is disposed inside one end of the furnace 2 , and a rear arch 22 is disposed inside the other end of the furnace 2 .

[0025] Furthermore, one end of the chain grate 3 is provided with an air blast inlet 31 for air intake.

[0026] Furthermore, an economizer 7 is installed at the outer end of the smoke exhaust pipe 6. The waste heat of the flue gas is recovered by the economizer 7, and this part of the heat energy can be converted into steam, hot water, etc., thereby improving the thermal efficiency of the boiler and reducing energy consumption. A chimney 8 is installed at the outer end of the economizer 7 for exhausting the flue gas.

[0027] Furthermore, a slag discharger 9 is installed on the outside of one side of the furnace 2 for discharging waste slag.

[0028] Furthermore, a thread groove 114 is provided on the outer wall of the threaded smoke tube 11 to increase the surface area of ​​the threaded smoke tube 11, thereby improving the heat exchange effect with water.

[0029] Furthermore, a platform ladder 10 is installed on one side of the top of the boiler drum 1 for maintenance personnel to climb up.

[0030] When the biomass steam boiler with a threaded smoke tube and an arched tube plate structure of the utility model is used, the biomass fuel first enters the furnace 2 through the hopper 4 and burns on the chain grate 3. The high-temperature flue gas generated by the combustion rises and is ready to enter the threaded smoke tube 11. The smoke flows and exchanges heat. The high-temperature smoke passes through the front smoke box 5 and enters the horizontal multiple groups of threaded smoke tubes 11. Each threaded smoke tube 11 is divided into three routes: the first route 111, the second route 112 and the third route 113, forming three smoke return channels. During the return process, the smoke fully contacts the inner wall of the threaded smoke tube to exchange heat. After multiple return routes, the smoke temperature is reduced, but it still has residual heat. These residual heats enter the economizer 7 through the exhaust pipe 6 and are converted into steam or hot water. These heat energies further heat the water in the drum 1 and improve the thermal efficiency of the boiler. The steam-water separator 12 separates water and steam, and controls the discharge of steam through the main steam valve 13. The waste slag in the furnace 2 is regularly cleaned out of the furnace through the slag discharger 9. The treated flue gas is discharged through the chimney 8.

[0031] Finally, it should be noted that the electronic components of the steam-water separator 12, slag discharger 9, etc. in this embodiment are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components are connected by wires respectively, and the specific connection means should refer to the working sequence between the electrical components in the above-mentioned working principle to complete the electrical connection, which are all well-known technologies in the art.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A biomass steam boiler with a threaded smoke tube and an arched tube sheet structure, comprising a boiler drum (1), characterized in that: A furnace (2) is installed at the bottom of the boiler drum (1), a hopper (4) is installed at one end of the furnace (2), a chain grate (3) is installed at the bottom of the furnace (2), a plurality of horizontal groups of threaded smoke pipes (11) are arranged inside the boiler drum (1), a front smoke box (5) is arranged at one end of the boiler drum (1), a smoke exhaust pipe (6) is arranged at the other end of the boiler drum (1), one end of the threaded smoke pipe (11) is connected to the front smoke box (5), and the other end of the threaded smoke pipe (11) is connected to the smoke exhaust pipe (6), each of the threaded smoke pipes (11) is divided into three courses, namely a first course (111), a second course (112) and a third course (113) which are connected in sequence, and the first course (111), the second course (112) and the third course (113) form three smoke return channels.

2. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: A steam-water separator (12) is installed above the interior of the boiler drum (1), and a main steam valve (13) is installed on the top of the steam-water separator (12).

3. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: A front arch (21) is arranged inside one end of the furnace (2), and a rear arch (22) is arranged inside the other end of the furnace (2).

4. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: One end of the chain grate (3) is provided with an air blast inlet (31).

5. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: An energy saver (7) is installed at the outer end of the smoke exhaust pipe (6), and a chimney (8) is installed at the outer end of the energy saver (7).

6. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: A slag discharger (9) is installed outside one side of the furnace (2).

7. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: The outer wall of the threaded smoke pipe (11) is provided with a thread groove (114).

8. The biomass steam boiler with a threaded smoke tube and an arched tube sheet structure according to claim 1 is characterized in that: A platform ladder (10) is installed on one side of the top of the boiler drum (1).

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