Biomass steam boiler

Abstract

According to the technical scheme, the biomass steam boiler is characterized by comprising a boiler body, and a supporting frame is arranged at the bottom of the boiler body; the steam furnace surrounds the outer side of the furnace body and is located above the feeding port, and water is contained in the steam furnace and used for absorbing heat in the furnace body so that the water can generate water vapor; the water inlet pipe is fixedly connected to the position, close to the bottom, of one side of the steam furnace and used for introducing water into the steam furnace; the steam pipe is fixedly connected to one side of the top of the steam furnace and used for sending out steam generated in the steam furnace; the containing box is used for containing redundant water vapor when the air pressure in the steam furnace is too high; and a connecting pipe; through the arrangement of the containing box, when the air pressure in the steam furnace is too high, part of water vapor can be conveyed into the containing box through the connecting pipe, so that the situation that the safety and stability of the steam furnace are affected due to the too high air pressure in the furnace body cooling process is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam boilers, and more particularly to a biomass steam boiler. BACKGROUND

[0002] The biomass fuel steam boiler usually uses biomass fuel as a heat source to produce water vapor by heating water in the process of use, wherein the biomass fuel includes solid and gas forms, wherein the solid fuel is mostly renewable biomass materials such as wood chips, and the gas fuel is a combustible gas generated by pyrolysis, gasification or fermentation of biomass.

[0003] In order to improve the combustion efficiency and thermal efficiency, the existing biomass steam boiler uses both gas fuel and solid fuel to achieve the combustion of gas-solid mixed biomass fuel, but the high combustion efficiency and thermal efficiency of the gas-solid mixed biomass fuel will cause the combustion temperature to be too high, which will cause the steam pressure in the boiler to gradually increase, and the solution to this problem is to reduce the supply of fuel to reduce the temperature of fuel combustion, but the reduction of the fuel supply will reduce the temperature in the boiler, which will cause the pressure in the boiler to increase slowly, thereby affecting the safety and stability of the boiler. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a biomass steam boiler, which can transport part of the water vapor to the containing box through the connecting pipe to prevent the steam furnace from affecting the safety and stability due to the excessive gas pressure in the process of reducing the temperature in the furnace body.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a biomass steam boiler, comprising a furnace body, a support frame is arranged at the bottom of the furnace body, the support frame is used for supporting solid biomass fuel, a plurality of vertical injection pipes are fixedly connected to the top of the support frame, the injection pipes are used for injecting gas biomass fuel mixed with oxygen or air outward, a feed inlet for supplying solid biomass fuel is arranged on the furnace body on one side of the top of the support frame;

[0006] A steam furnace is arranged outside the furnace body and above the feed inlet, the steam furnace contains water and is used for absorbing heat in the furnace body to make the water produce water vapor;

[0007] A water inlet pipe is fixedly connected to the position close to the bottom on one side of the steam furnace for introducing water into the steam furnace;

[0008] A steam pipe is fixedly connected to one side of the top of the steam furnace for sending out the steam generated in the steam furnace.

[0009] A containing box is arranged for containing the excess steam when the air pressure in the steam furnace is too high.

[0010] A connecting pipe is arranged for connecting the containing box with the steam pipe, and a valve is arranged on the connecting pipe for controlling the opening and closing of the connecting pipe.

[0011] The containing box is arranged as a cylindrical box body with the axis being horizontal, and both ends of the containing box are closed, one end of the containing box is close to the connecting pipe and is fixedly connected with the connecting pipe, the end of the containing box close to the connecting pipe is arranged as an air inlet end, and the other end is arranged as a closed end.

[0012] A piston plate is arranged in the containing box and coaxial with the containing box, the piston plate is attached to the inner wall of the containing box around, the piston plate can slide along the axis of the containing box in the containing box, the space between the piston plate and the air inlet end of the containing box is arranged as a containing space, and the piston plate adjusts the pressure of the steam in the containing space by sliding.

[0013] A hydraulic cylinder is arranged in the containing box and is fixedly connected to the closed end of the containing box, the cylinder body of the hydraulic cylinder is fixedly connected to the containing box, and the piston rod is fixedly connected to the piston plate.

[0014] A pressure relief valve is fixedly connected to the top of the containing box close to the air inlet end, a drain pipe is fixedly connected to the bottom of the containing box close to the air inlet end, and a valve is arranged on the drain pipe.

[0015] A slag discharging box is fixedly connected to the bottom of the furnace body, the furnace body is arranged as a cylinder with the axis being vertical, and the slag discharging box is coaxial with the furnace body.

[0016] A rotating rod coaxial with the furnace body is rotatably connected to the support frame, two rotating rods are fixedly connected to the outside of the rotating rod and are arranged in the radial direction of the furnace body and above the support frame and the jet pipe, the two rotating rods are arranged on the two sides of the rotating rod, and the top of the two ends of the two rotating rods away from each other is fixedly connected with two vertically arranged scrapers, and the blade part of the scraper is attached to the inner cavity of the furnace body.

[0017] A plurality of vertically arranged disturbance rods are fixedly connected to the bottom of the rotating rod, and the disturbance rods are used for disturbing the solid biomass fuel during the rotation of the rotating rod.

[0018] The application is further provided with a slag discharge port penetrating through the side wall of the slag discharge box, a slag discharge door is arranged outside the slag discharge port and is rotatably connected to the top of the slag discharge box, and the slag discharge door controls the opening and closing of the slag discharge port by rotation.

[0019] The application is further provided with a plurality of slag discharge plates arranged around the rotating rod in the slag discharge box, the slag discharge plates are arranged as arc plates around the vertical axis and are fixedly connected to the rotating rod, and the protrusions of the plurality of slag discharge plates are arranged towards the side affecting the rotating direction of the rotating rod.

[0020] The application is further provided with a heat insulation box coaxial with the slag discharge box fixedly connected to the bottom of the slag discharge box, the heat insulation box is filled with heat insulation medium, the bottom of the heat insulation box is fixedly connected with a power box, the power box is fixedly connected with a power motor, and the bottom end of the rotating rod vertically penetrates through the heat insulation box into the power box and is in transmission connection with the power motor in the power box.

[0021] In summary, the application has the following beneficial effects compared with the prior art: the setting of the containing box can transport part of the water vapor into the containing box through the connecting pipe when the gas pressure in the steam furnace is too high to prevent the steam furnace from affecting the safety and stability due to the too high gas pressure in the process of cooling in the furnace body. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic view of the overall structure of the embodiment;

[0023] Figure 2 It is a sectional view of the containing box of the embodiment;

[0024] Figure 3 It is a sectional view of the overall structure of the embodiment;

[0025] Figure 4 It is an enlarged schematic view of A of Figure 3

[0026] Figure 5 It is a schematic view of the slag discharge plate of the embodiment.

[0027] In the figure: 1, furnace body; 11, support frame; 12, injection pipe; 2, steam furnace; 21, water inlet pipe; 22, steam pipe; 23, connecting pipe; 3, containing box; 31, piston plate; 32, hydraulic cylinder; 33, pressure relief valve; 34, drain pipe; 4, slag discharge box; 41, slag discharge port; 42, slag discharge door; 5, heat insulation box; 6, power box; 7, rotating rod; 71, rotating rod; 72, scraper; 73, disturbing rod; 74, slag discharge plate. DETAILED DESCRIPTION

[0028] ​In order to make the technical solution of the present application better understood by the people in the art, the technical solution of the present application is described clearly and completely below in combination with the drawings of the present application. Based on the embodiments in the present application, other similar embodiments obtained by the people in the art without making creative efforts shall belong to the scope of protection of the present application. In addition, the direction words mentioned in the following embodiments, such as "up", "down", "left", "right", etc. are only the directions of the drawings, therefore, the direction words used are for illustration but not for limitation of the present application.

[0029] The present application is further described below in combination with the drawings and the preferred embodiments.

[0030] Embodiment: a biomass steam boiler, referring to the drawings Figure 1 - the drawings Figure 5 , including a furnace body 1, a steam furnace 2, a water inlet pipe 21, a steam pipe 22, a containing box 3 and a connecting pipe 23, the bottom of the furnace body 1 is provided with a support frame 11, the support frame 11 is used for supporting solid biomass fuel, the top of the support frame 11 is fixedly connected with a plurality of vertically arranged injection pipes 12, the injection pipes 12 are used for spraying gas biomass fuel mixed with oxygen or air outward, one side of the top of the support frame 11 is provided with a feeding port arranged on the furnace body 1 for supplying solid biomass fuel; the steam furnace 2 is arranged around the outside of the furnace body 1 above the feeding port, the steam furnace 2 contains water and is used for absorbing heat in the furnace body 1 to make the water generate steam; the water inlet pipe 21 is fixedly connected at a position close to the bottom on one side of the steam furnace 2 for passing water into the steam furnace 2; the steam pipe 22 is fixedly connected at a position on one side of the top of the steam furnace 2 for sending out the steam generated in the steam furnace 2; the containing box 3 is used for containing excess steam when the air pressure in the steam furnace 2 is too high; the connecting pipe 23 communicates the containing box 3 with the steam pipe 22, and a valve is arranged on the connecting pipe 23 for controlling the opening and closing of the connecting pipe 23.

[0031] The solid biomass fuel enters the furnace body 1 through the feeding port and burns on the support frame 11, and the gas biomass fuel is mixed with oxygen or air and then sprayed out through the injection pipes 12 to burn in the furnace body 1, the heat generated by the burning is absorbed by the water in the steam furnace 2 to form steam in the steam furnace 2. When the air pressure in the steam furnace 2 is too high because of the too high burning temperature in the furnace body 1, the fuel supply in the furnace body 1 is reduced, and the valve on the connecting pipe 23 is opened, so that part of the steam in the steam furnace 2 enters the containing box 3, thereby reducing the air pressure in the steam furnace 2 and preventing the air pressure in the steam furnace 2 from continuously increasing during the process of reducing the temperature in the boiler, which affects the safety and stability of the steam furnace 2.

[0032] Specifically, the containing box 3 is arranged as a cylindrical box body with the axis horizontal, both ends of the containing box 3 are closed, one end of the containing box 3 is close to the connecting pipe 23 and is fixedly connected with the connecting pipe 23, the end of the containing box 3 close to the connecting pipe 23 is arranged as an air inlet end, and the other end is arranged as a closed end; the containing box 3 is internally provided with a piston plate 31 located in the containing box 3 and coaxial with the containing box 3, the piston plate 31 is attached to the inner wall of the containing box 3 around, the piston plate 31 can slide in the containing box 3 along the axis direction of the containing box 3, and the space between the piston plate 31 and the air inlet end of the containing box 3 is arranged as a containing space, and the piston plate 31 adjusts the pressure of the water vapor entering the containing space by sliding.

[0033] Through the arrangement of the piston plate 31, the pressure of the water vapor entering the containing box 3 can be controlled, and the water vapor in the containing box 3 can be pressed into the steam oven 2 again after the air pressure in the steam oven 2 is normal.

[0034] Specifically, the containing box 3 is internally provided with a hydraulic cylinder 32 fixedly connected to the closed end of the containing box 3, the cylinder body of the hydraulic cylinder 32 is fixedly connected to the containing box 3, and the piston rod is fixedly connected to the piston plate 31.

[0035] Specifically, the top of the containing box 3 close to the air inlet end is fixedly connected with a pressure relief valve 33, and the bottom close to the air inlet end is fixedly connected with a drain pipe 34, and the drain pipe 34 is provided with a valve.

[0036] In the containing box 3, part of the water vapor will condense to form liquid water, and this part of water will be discharged through the drain pipe 34 after the water vapor in the containing box 3 is discharged and the valve on the connecting pipe 23 is closed. Through the arrangement of the pressure relief valve 33, when the air pressure of the water vapor in the containing box 3 reaches a set threshold value, the water vapor can be discharged outward, so as to prevent the air pressure of the steam oven 2 and the containing box 3 from exceeding the threshold value.

[0037] Specifically, the bottom of the furnace body 1 is fixedly connected with a slag discharge box 4, the furnace body 1 is arranged as a cylinder with the axis vertical, and the slag discharge box 4 is arranged coaxially with the furnace body 1.

[0038] Specifically, the support frame 11 is rotatably connected with a rotating rod 7 coaxial with the furnace body 1, the rotating rod 7 is fixedly connected with two rotating rods 71 arranged in the radial direction of the furnace body 1 and located above the support frame 11 and the injection pipe 12, the two rotating rods 71 are respectively arranged on both sides of the rotating rod 7, and the top of the two ends of the two rotating rods 71 away from each other is fixedly connected with two vertically arranged scrapers 72, and the blade part of the scraper 72 is attached to the inner cavity of the furnace body 1.

[0039] The biomass fuel combustion process will produce soot and particulate ash, after adhering to the inner wall of the furnace 1, the accumulation of ash will affect the heat transfer to the steam furnace 2; the rotating rod 7 drives the scraper 72 to rotate, which can clean the ash adhering to the inner wall of the furnace 1.

[0040] The rotating rod 71 is fixedly connected with a plurality of vertical disturbance rods 73 at the bottom, and the disturbance rods 73 are used to disturb the solid biomass fuel during the rotation of the rotating rod 71. The disturbance of the disturbance rod 73 can disturb the solid biomass fuel during combustion, so that the air is more easily entered into the gap of the solid biomass fuel, and the combustion efficiency of the solid biomass fuel is improved.

[0041] Specifically, the slag discharge box 4 is provided with a slag discharge port 41 penetrating through the side wall of the slag discharge box 4, and the slag discharge port 41 is provided with a slag discharge door 42 rotatably connected to the top of the slag discharge box 4. The slag discharge door 42 controls the opening and closing of the slag discharge port 41 by rotating. The rotating rod 7 extends vertically into the slag discharge box 4, and the slag discharge box 4 is provided with a plurality of slag discharge plates 74 arranged around the rotating rod 7. The slag discharge plate 74 is arranged as an arc plate around the vertical axis and is fixedly connected to the rotating rod 7. The protrusions of the plurality of slag discharge plates 74 are arranged on the side affecting the rotating direction of the rotating rod 7.

[0042] Through the arrangement of the slag discharge plate 74, during the rotation of the rotating rod 7, the opening of the slag discharge port 41 can make the slag discharge plate 74 push the remaining ash after the biomass fuel combustion out of the slag discharge port 41.

[0043] Specifically, the bottom of the slag discharge box 4 is fixedly connected with a heat insulation box 5 coaxial with the slag discharge box 4, the heat insulation box 5 is filled with heat insulation medium, the bottom of the heat insulation box 5 is fixedly connected with a power box 6, the power box 6 is fixedly connected with a power motor, and the bottom end of the rotating rod 7 vertically penetrates through the heat insulation box 5 and enters the power box 6 and is in transmission connection with the power motor in the power box 6.

[0044] Through the arrangement of the heat insulation box 5 and the heat insulation medium, the heat transfer to the power motor can be prevented, and the normal work of the power motor can be ensured.

[0045] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the scope of the present application should be considered as falling within the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and refinements without departing from the principles of the present application should also be considered as falling within the protection scope of the present application.

Claims

1. A biomass steam boiler, characterized in that: The furnace includes a furnace body (1), and a support frame (11) is provided at the bottom of the furnace body (1). The support frame (11) is used to support solid biomass fuel. Several vertically arranged injection pipes (12) are fixedly connected to the top of the support frame (11). The injection pipes (12) are used to inject gaseous biomass fuel mixed with oxygen or air. A feed port for supplying solid biomass fuel is provided on one side of the top of the support frame (11) on the furnace body (1). A steam furnace (2) surrounds the outside of the furnace body (1) and is located above the feed inlet. The steam furnace (2) contains water and is used to absorb heat from the furnace body (1) to generate steam from the water. Water inlet pipe (21), which is fixedly connected to the bottom side of the steam furnace (2) for supplying water into the steam furnace (2); Steam pipe (22), which is fixedly connected to one side of the top of the steam furnace (2) for sending out the steam generated in the steam furnace (2); The container (3) is used to contain excess water vapor when the gas pressure in the steam furnace (2) is too high; And a connecting pipe (23) that connects the container (3) to the steam pipe (22), and a valve that controls the opening and closing of the connecting pipe (23) is provided on the connecting pipe (23).

2. A biomass steam boiler according to claim 1, characterized in that: The container (3) is configured as a cylindrical box that is horizontal to the axis. The two ends of the container (3) are closed. One end of the container (3) is close to the connecting pipe (23) and is fixedly connected to the connecting pipe (23). The end of the container (3) close to the connecting pipe (23) is configured as the air inlet end, and the other end is configured as the closed end. The container (3) is provided with a piston plate (31) located inside the container (3) and coaxial with the container (3). The piston plate (31) is attached to the inner wall of the container (3) around its perimeter. The piston plate (31) can slide inside the container (3) along the axial direction of the container (3). The space between the piston plate (31) and the air inlet end of the container (3) is set as the container space. The piston plate (31) adjusts the pressure of the water vapor entering the container space by sliding.

3. A biomass steam boiler according to claim 2, characterized in that: The container (3) is equipped with a hydraulic cylinder (32) fixedly connected to the closed end of the container (3). The cylinder body of the hydraulic cylinder (32) is fixedly connected to the container (3), and the piston rod is fixedly connected to the piston plate (31).

4. A biomass steam boiler according to claim 3, characterized in that: The container (3) is fixedly connected to a pressure relief valve (33) at the top near the air inlet end, and a drain pipe (34) is fixedly connected to the bottom near the air inlet end. A valve is provided on the drain pipe (34).

5. A biomass steam boiler according to claim 4, characterized in that: The bottom of the furnace body (1) is fixedly connected to a slag discharge box (4). The furnace body (1) is set as a cylindrical shape with a vertical axis. The slag discharge box (4) is set coaxially with the furnace body (1).

6. A biomass steam boiler according to claim 5, characterized in that: The support frame (11) is rotatably connected to a rotating rod (7) coaxial with the furnace body (1). Two rotating rods (71) are fixedly connected to the outside of the rotating rod (7), which are arranged along the radial direction of the furnace body (1) and located above the support frame (11) and the injection pipe (12). The two rotating rods (71) are respectively arranged on both sides of the rotating rod (7). Two vertically arranged scrapers (72) are fixedly connected to the top of the two ends of the two rotating rods (71) that are far apart from each other. The blade of the scraper (72) fits against the inner cavity of the furnace body (1).

7. A biomass steam boiler according to claim 6, characterized in that: The bottom of the rotating rod (71) is fixedly connected with several vertically arranged disturbance rods (73), which are used to disturb the solid biomass fuel during the rotation process following the rotating rod (71).

8. A biomass steam boiler according to claim 7, characterized in that: The slag discharge box (4) is provided with slag discharge ports (41) that penetrate the side wall of the slag discharge box (4) on both sides. A slag discharge door (42) is provided outside the slag discharge port (41) and is rotatably connected to the top of the slag discharge box (4). The slag discharge door (42) controls the opening and closing of the slag discharge port (41) by rotation.

9. A biomass steam boiler according to claim 8, characterized in that: The rotating rod (7) extends vertically into the slag discharge box (4). The slag discharge box (4) is provided with a plurality of slag discharge plates (74) arranged around the rotating rod (7). The slag discharge plates (74) are set as arc-shaped plates around the vertical axis and are fixedly connected to the rotating rod (7). The protrusions of the plurality of slag discharge plates (74) are arranged facing the side that affects the rotation direction of the rotating rod (7).

10. A biomass steam boiler according to claim 9, characterized in that: The bottom of the slag discharge box (4) is fixedly connected to a heat insulation box (5) coaxial with the slag discharge box (4). The heat insulation box (5) is filled with heat insulation medium. The bottom of the heat insulation box (5) is fixedly connected to a power box (6). The power box (6) is fixedly connected to a power motor. One end of the bottom of the rotating rod (7) passes vertically through the heat insulation box (5) and enters the power box (6) and is connected to the power motor in the power box (6) for transmission.

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