A self-isolating rotary biomass feeding system and feeding method

Abstract

At present, the feeding technology of biomass boilers generally adopts a screw feeder device with relatively simple structure and control. However, this feeding device is prone to jamming and tempering, and in order to prevent the occurrence of tempering, the feed pipe must be made very long, which causes the feed part to be disconnected and separated from the furnace body, which not only destroys the overall appearance of the product but also increases the floor space. The present invention uses a self-isolating rotor biomass feeding method. Regardless of the power outage or shutdown when the rotor rotates to any position, it can ensure effective isolation between the drop port at high temperature and the hopper. Due to the extremely short feed pipe, the feed part and the boiler part can be integrated, which not only increases the aesthetics but also reduces the floor space. Due to the high transmission ratio, the torque of the rotor is amplified several times, and combined with the blade for cutting the fuel, the system can cope with harder biomass blocks. In addition, due to the mutual cooperation of hardware and software, micro-feeding control can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of boilers, and in particular to a self-isolating rotor-type biomass feeding system and a feeding method. Background Art

[0002] In my country, the amount of straw biomass, mainly crop waste, is huge. If it is not utilized, it will not only waste resources but also bring huge pressure to the environment. Boilers that use biomass as fuel are one of the important ways to solve this problem.

[0003] At present, the feeding technology of biomass boilers generally adopts a screw feeder system with relatively simple structure and control. However, this feeding system also has the following shortcomings: (1) It is easy to flash back: For some boilers with frequent pressure fluctuations, especially positive pressure furnaces, it is easy for the high-temperature flue gas in the furnace to flow back to the discharge port of the feeding system, igniting the feeding sleeve and the biomass fuel in the hopper, causing flash back, which can cause fire accidents in severe cases; (2) It is difficult to control the micro-feeding: Due to structural limitations, when the boiler is running at a low load or a low fire insulation, if it is running at a feed rate of less than 5g / 10s, it will not be completed; (3) Due to safety reasons such as avoiding flash back, the feeding sleeve should not be made too short, which will cause the feeding part to be disconnected and separated from the furnace part, destroying the overall appearance of the product and increasing the floor space.

[0004] Therefore, it is necessary to provide a new self-isolating rotor biomass feeding system to solve the above technical problems. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a self-isolating rotor-type biomass feeding system.

[0006] The present invention is mainly solved by the following specific technical solutions:

[0007] A self-isolating wheel-type biomass feeding system, characterized in that it includes a stator 1 and a rotor 2; wherein a feed port 4 is opened on the side of the stator shell 3, and the outside of the feed port 4 is connected to the discharge port of the feed hopper 5; a discharge port 7 is opened on the upper part of the stator inner shell 6, and the lower part of the discharge port 7 is connected to the blanking inclined tube 8, the rear side of the stator shell 3 and the rear side of the stator inner shell 6 are fixed on the rear baffle 9, and the front baffle 10 is fixed on the front side of the stator inner shell 6, the stator shell 3, the stator inner shell 6 and the front baffle 10 have a common axis, and a thread is led out through the axis. The shaft 11 for positioning the rotor 2 has a threaded outer end to facilitate locking the rotor 2 with a nut 12. 4 to 8 isolation blocks 14 are evenly fixed on the rotor cover 13. The rotor cover 13 and the isolation blocks 14 can be embedded in the annular groove formed by the stator outer shell 3 and the stator inner shell 6, and can rotate freely under the support of the shaft 11 and the bearing 15. The gap between the moving and static parts is between 0.5 mm and 1.5 mm; a storage chamber 16 is formed between two adjacent isolation blocks 14, and the duty ratio of the isolation block 14 to the storage chamber 16 is 0.2 to 0.4.

[0008] Preferably, a driven sprocket 18 driven by the driving sprocket 17 is fixed to the outside of the rotor, and the transmission ratio between the driving sprocket 17 and the driven sprocket 18 is equal to the number of the isolation blocks 14 .

[0009] Preferably, a fuel cutting blade 19 is fixed on the upper edge of the stator feed port.

[0010] Preferably, a peephole is opened on the top of the stator housing for installing the flame detection head 20, and a temperature control switch is attached to the flame detection head.

[0011] Preferably, an inductive stud 21 is provided on the output shaft of the driving wheel, and an inductive proximity switch A22 and an inductive proximity switch B23 are installed on the trajectory of the inductive stud 21 rotating with the shaft, and when the inductive stud 21 approaches the inductive head of the A or B inductive proximity switch, the switch is triggered and actuated.

[0012] Preferably, a positive pressure pipe 24 is installed on the rear baffle 9.

[0013] Preferably, a feeding method 1 of a self-isolating rotary biomass feeding system is provided, characterized in that: when the induction stud 21 rotates to the position of the induction proximity switch A22, the isolation block 14 is at the starting feeding position, and then the boiler controller starts the feeding reduction motor continuously or in a momentary manner according to the combustion conditions, and then drives the isolation block 14 to push the fuel into the blanking inclined tube 8 and the furnace, so as to achieve the purpose of controlling the feeding amount; when the induction stud 21 rotates to the position of the induction proximity switch B23, the isolation block 14 is at the feeding end position, and then the boiler controller continuously starts the feeding reduction motor, so that the feeder rotates to the starting feeding position again, and so on. For each rotation of the driving wheel, the isolation block 14 is always in the same working position corresponding to different isolation blocks; when the blanking inclined tube 8 and the furnace are blocked, the flame detection head stops running and alarms because it cannot detect the flame; when the fuel in the blanking inclined tube 8 is ignited, the temperature control switch in the flame detection head is actuated and the boiler controller stops running and alarms.

[0014] Preferably, a feeding method 2 of a self-isolating rotary biomass feeding system is characterized in that: when the feed amount needs to be reduced due to load reduction, two methods of hardware equipment plus software control are used to complete it. One is to complete it through a second-level inching feeding mode: for example, the transmission ratio of the master and driven wheels is 5, when the driving wheel rotates 10°, the driven wheel only rotates 2°, so that the amount of fuel pushed into the blanking inclined tube 8 can be micro-controlled; the second is to detect the blanking in real time through the feature that the optical path 26 of the flame detection head 20 is the same as the blanking inclined tube 8. Situation: When too much material is dropped, the flame signal received by the flame detection head 20 will inevitably be blocked when the fuel particles pass through the dropping inclined tube 8, thereby forming a number of pulse signals proportional to the feeding number at the fire detection output. When the number of pulses received by the boiler controller is greater than the given value, the feeding reduction motor will be stopped immediately to terminate the feeding. Similarly, when there is no material dropping during the feeding process, the flame pulse signal received by the boiler controller will not change, which will increase the feeding time. Through the mutual cooperation and mutual complementation of the above two methods, each feeding action can be achieved accurately.

[0015] Beneficial effects:

[0016] 1. The present invention is a self-isolating rotary biomass feeding system. Since the driving and driven wheels adopt a transmission ratio of 4 to 6, based on the relationship that the torque is proportional to the transmission ratio when the transmission power is constant, when the torque of the reduction motor is constant, the torque of the feeding system is amplified by 4 to 6 times. Combined with the fuel-cutting blade, the system can handle larger or harder biomass blocks, so the feeding is stable and reliable. It can transport biomass pellets and biomass bulk materials with a certain fluidity, such as rice husks, peanut shells, and walnut shells, with a spherical equivalent diameter of 5 mm to 30 mm.

[0017] 2. Due to the unique isolation block structure adopted in the present invention, the sealing distance between each storage chamber is long. Moreover, no matter when the power is off or the machine is shut down when the rotor rotates to any angle, it can ensure the effective separation between the storage chamber at the drop-out port and the feed port. Even if the storage chamber at the drop-out port is burned due to backfire, it will not spread to the hopper and cause a fire accident.

[0018] 3. When the feed rate needs to be reduced due to load reduction, the present invention adopts the mutual coordination and complementation of hardware equipment and software control, so that each feeding action can be accurately and in place, which can ensure the stable and long-term operation of the boiler at low load.

[0019] 4. Since the present invention omits the feed sleeve, the feed hopper can be relatively close to the boiler body, and the boiler can be designed to have a small footprint, an integrated appearance, and a home appliance-like appearance. In addition, due to the design of the side feed port, the height of the feed hopper can be appropriately lowered, which makes feeding more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is an exploded structural diagram of a self-isolating rotary feeder according to an embodiment of the present invention;

[0022] Figure 2 This is a structural diagram of the back of the self-isolating rotary feeder according to an embodiment of the present invention;

[0023] Figure 3 A front cross-sectional view of a self-isolating rotary feeder according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the feeding starting position according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the feeding end position according to an embodiment of the present invention;

[0026] Figure 6 It is a side sectional view of the self-isolating rotary wheel feeder according to an embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028]

[0029] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

[0031] Example 1:

[0032] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, a self-isolating rotary biomass feeding system includes a stator 1 and a rotor 2, wherein a square opening is opened on the side of the stator shell 3 as a feed port 4, the outside of the feed port 4 is connected to the discharge port of the feed hopper 5, a circular opening is opened on the upper part of the stator inner shell 6 as a discharge port 7, the lower part of the discharge port 7 is connected to the drop inclined pipe 8, the rear side of the stator shell 3 and the rear side of the stator inner shell 6 are fixed on the rear baffle 9, a positive pressure pipe 24 is installed on the rear baffle 9, and the front baffle 10 is fixed on the front side of the stator inner shell 6. The stator shell 3, the stator inner shell 6 and the front baffle 10 have a common axis, and a shaft 11 for positioning the rotor is led out through the axis, and the outer end of the shaft is threaded. It is convenient to lock the rotor with a nut 12. 4 to 6 isolation blocks 14 are fixed on the rotor cover 13. The rotor cover 13 and the isolation blocks 14 can be embedded in the annular groove formed by the stator outer shell 3 and the stator inner shell, and can rotate freely under the support of the shaft 11 and the bearing 15. The gap between the dynamic and static parts is between 0.5mm and 1.5mm. A driven sprocket 18 is fixed to the outside of the rotor and is powered by the driving sprocket 17 and the chain 25. The transmission ratio of the driving sprocket 17 and the driven sprocket 18 is equal to the number of isolation blocks 14. There is a storage chamber 16 between two adjacent isolation blocks 14, and the duty ratio of the isolation block 14 to the storage chamber 16 is 0.2 to 0.4.

[0033] Example 2:

[0034] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 As shown, a fuel cutting blade 19 is fixed on the upper edge of the stator feed port, and a peephole is opened on the top of the stator shell for installing a flame detection head 20. The flame detection head is equipped with a temperature control switch. An induction stud 21 is provided on the active output shaft, and an induction proximity switch A22 and an induction proximity switch B23 are installed on the trajectory of the induction stud 21 rotating with the shaft, and it is ensured that the induction stud 21 can trigger the corresponding induction proximity switch action.

[0035] Example 3:

[0036] like Figure 2 、 Figure 4 、 Figure 5 As shown, a feeding method of a self-isolating rotary biomass feeding system includes the following steps: when the induction stud 21 rotates to the position of the induction proximity switch A22, the isolation block 14 is at the starting feeding position, and the boiler controller starts the feeding reduction motor continuously or in a jog manner according to the combustion conditions, thereby driving the isolation block 14 to push the fuel into the blanking inclined tube 8 and the furnace, thereby achieving the purpose of controlling the feeding amount; when the induction stud 21 rotates to the position of the induction proximity switch B23, the isolation block 14 is at the feeding end position, and the boiler controller continuously starts the feeding reduction motor, so that the feeder rotates to the starting feeding position again, and the cycle continues; each time the driving wheel rotates one circle, the isolation block 14 is always in the same working position corresponding to different isolation blocks; when the blanking inclined tube 8 and the furnace are blocked, the flame detection head stops operating and the boiler controller alarms because it cannot detect the flame; when the fuel in the blanking inclined tube 8 is ignited, the temperature control switch in the flame detection head is actuated, and the boiler controller stops operating and alarms.

[0037] Example 4:

[0038] like Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 As shown, when it is necessary to reduce the feed amount due to load reduction, two methods of hardware equipment plus software control are used together to complete it. One is to complete it through the second-level inching feeding mode: for example, the transmission ratio of the main and driven wheels is 5. When the driving wheel rotates 10°, the driven wheel only rotates 2°. In this way, the amount of fuel pushed into the blanking inclined tube 8 can be micro-controlled; the second is to detect the blanking situation in real time through the feature that the optical path 26 of the flame detection head 20 is the same as the blanking inclined tube 8: when too much blanking occurs, the fuel particles will inevitably block the flame signal received by the flame detection head 20 while passing through the blanking inclined tube 8, thereby forming a number of pulse signals proportional to the feed number at the fire detection output. When the number of pulses received by the boiler controller is greater than the given value, the feed reduction motor is stopped immediately to terminate the feed. Similarly, when there is no blanking during the feeding process, the flame pulse signal received by the boiler controller does not change, which will increase the feeding time. Through the mutual cooperation and mutual complementation of the above two methods, each feeding action can be achieved accurately.

[0039] Example 5:

[0040] like Figure 2 As shown, when the boiler furnace is operated at positive pressure, in order to prevent hot air from leaking from the gap between the dynamic and static parts of the self-isolating rotor biomass feeding system, the positive pressure pipe 24 can be activated, that is, a pipe is led out from the blower outlet and connected to the positive pressure pipe 24.

[0041] The above description is the preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A self-isolating rotary biomass feeding system, characterized by: The invention comprises a stator (1) and a rotor (2); wherein a feed port (4) is provided on the side of the stator shell (3), and the outside of the feed port (4) is connected to the discharge port of the feed hopper (5); a discharge port (7) is provided on the upper part of the stator inner shell (6), and the lower part of the discharge port (7) is connected to the drop-out inclined tube (8); the rear side of the stator shell (3) and the rear side of the stator inner shell (6) are fixed on the rear baffle (9), and the front baffle (10) is fixed on the front side of the stator inner shell (6); the stator shell (3), the stator inner shell (6) and the front baffle (10) have a common axis, and a shaft (11) for positioning the rotor (2) is led out through the axis, and the outer end of the shaft (11) is threaded to facilitate locking with a nut (12) The rotor (2) and the rotor cover (13) are evenly fixed with 4 to 8 isolation blocks (14). The rotor cover (13) and the isolation blocks (14) are embedded in an annular groove formed by the stator outer shell (3) and the stator inner shell (6). They can rotate freely under the support of the shaft (11) and the bearing (15), and the gap between the moving and static parts is between 0.5 mm and 1.5 mm. There is a storage chamber (16) between two adjacent isolation blocks (14). The duty ratio of the isolation blocks (14) and the storage chamber (16) is 0.2 to 0.

4. A fuel cutting blade (19) is fixed on the upper edge of the stator feed port. A peephole is opened on the top of the stator shell for installing a flame detection head (20). The flame detection head is equipped with a temperature control switch.

2. The self-isolating rotary biomass feeding system according to claim 1, characterized in that: A driven sprocket (18) driven by a driving sprocket (17) is fixed on the outer side of the rotor. The transmission ratio of the driving sprocket (17) to the driven sprocket (18) is equal to the number of the isolation blocks (14).

3. The self-isolating rotary biomass feeding system according to claim 1, characterized in that: An inductive stud (21) is provided on the output shaft of the driving wheel, and an inductive proximity switch A (22) and an inductive proximity switch B (23) are installed on the track of the inductive stud (21) rotating with the shaft, and when the inductive stud (21) approaches the inductive head of the A or B inductive proximity switch, the switch is triggered and actuated.

4. The self-isolating rotary biomass feeding system according to claim 1, characterized in that: A positive pressure pipe (24) is mounted on the rear baffle (9).

5. A feeding method using the self-isolating rotary biomass feeding system according to any one of claims 1 to 4, characterized in that: When the induction stud (21) rotates to the position of the induction proximity switch A (22), the isolating block (14) is at the starting feeding position, and the boiler controller starts the feeding reduction motor continuously or in a jog manner according to the combustion conditions, thereby driving the isolating block (14) to push the fuel into the blanking inclined tube (8) and the furnace, thereby achieving the purpose of controlling the feeding amount; when the induction stud (21) rotates to the position of the induction proximity switch B (23), the isolating block (14) is at the ending feeding position, and the boiler controller starts the feeding reduction motor continuously, so that the feeder rotates to the starting feeding position again, and the cycle continues; each time the driving wheel rotates one circle, the isolating block (14) corresponding to the different isolating blocks is always in the same working position; when the blanking inclined tube (8) and the furnace are blocked, the flame detection head stops operating and the boiler controller gives an alarm because it cannot detect the flame; when the fuel in the blanking inclined tube (8) is ignited, the temperature control switch in the flame detection head is actuated, and the boiler controller stops operating and gives an alarm.

6. The feeding method of the self-isolating rotary biomass feeding system according to claim 5, characterized in that: When the feed amount needs to be reduced due to load reduction, two methods of hardware equipment and software control are used together to complete the task. One is to complete the task through the second-level inching feed mode, so that the amount of fuel pushed into the drop-out inclined tube (8) can be micro-controlled; the other is to detect the drop-out situation in real time through the feature that the optical path (26) of the flame detection head (20) and the drop-out inclined tube (8) are on the same path: when too much drop-out occurs, the fuel particles will inevitably block the flame signal received by the flame detection head (20) while passing through the drop-out inclined tube (8), thereby forming a number of pulse signals proportional to the feed number at the fire detection output. When the number of pulses received by the boiler controller is greater than a given value, the feed reduction motor is immediately stopped to terminate the feed. Similarly, when there is no drop-out during the feed process, the flame pulse signal received by the boiler controller does not change, which will increase the feed time. Through the mutual cooperation and mutual complementation of the above two methods, each feed action can be achieved accurately.

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