Boiler feeding device with gas locking function

Abstract

The utility model relates to a boiler feeding device with a gas locking function, which comprises a feeding assembly and a gas locking assembly, the feeding assembly comprises a first screw conveyor, an articulated chute, a second screw conveyor and a stock bin, the discharge end of the first screw conveyor is communicated with a boiler, the feed end of the first screw conveyor is communicated with the bottom end of the articulated chute, and the discharge end of the second screw conveyor is communicated with the bottom end of the articulated chute. The elephant trunk is obliquely arranged, the top end of the elephant trunk is communicated with the discharging end of the second screw conveyor, the feeding end of the second screw conveyor is communicated with the bottom of the stock bin, and the air locking assembly comprises a first gate valve and a second gate valve which are installed at the bottom end and the top end of the elephant trunk respectively; when the working condition of the boiler deteriorates or the power of the induced draft fan is reduced, high-temperature flue gas in the boiler flows into the feeding device, so that the bottom end and the top end of the elephant trunk are blocked by controlling the first gate valve and the second gate valve through the arranged gas locking assembly, the high-temperature flue gas can be prevented from entering the stock bin, and the safety performance of the boiler feeding device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste resource treatment, in particular to a boiler feeding device with an air locking function. Background Art

[0002] Biomass fuel combustion in power plants is a technology that uses biomass energy to generate electricity and provide heat. Currently, the process flow for biomass combustion in my country primarily consists of three parts: a furnace loading system, a biomass fuel combustion system, and a flue gas treatment system.

[0003] Among them, the furnace feeding system includes: the fuel is transported from the biomass fuel shed through the belt corridor to the furnace silo, and then the screw feeding mechanism is used to transport the fuel from the furnace silo to the circulating fluidized bed boiler for combustion.

[0004] However, when the boiler operating condition deteriorates or the induced draft fan power decreases, the pressure in the boiler furnace increases, and the boiler feed port changes from negative pressure to positive pressure. The high-temperature flue gas in the boiler will enter the screw feeding mechanism and eventually enter the furnace silo, causing a fire. The safety performance of the boiler feeding device needs to be improved. Utility Model Content

[0005] In view of this, it is necessary to provide a boiler feeding device with an air locking function to solve the problem that the high-temperature flue gas in the boiler will enter the screw feeding mechanism and eventually enter the hopper in front of the furnace, causing a fire. The safety performance of the boiler feeding device needs to be improved.

[0006] The utility model provides a boiler feeding device with an air locking function, comprising a feeding assembly and an air locking assembly, the feeding assembly comprising a first screw conveyor, a chute, a second screw conveyor and a silo, the discharge end of the first screw conveyor being connected to the boiler, the feed end of the first screw conveyor being connected to the bottom end of the chute, the chute being inclined, the top end of the chute being connected to the discharge end of the second screw conveyor, the feed end of the second screw conveyor being connected to the bottom of the silo, the air locking assembly comprising a first gate valve and a second gate valve respectively installed at the bottom end and the top end of the chute.

[0007] Furthermore, the first screw conveyor and the second screw conveyor are arranged horizontally, and the slide pipe is arranged obliquely upward in a direction away from the second screw conveyor.

[0008] Furthermore, the air lock assembly also includes a bypass pipe connected to the slide pipe, the bypass pipe is installed on one side of the slide pipe along its inclination direction, and a solenoid valve is installed at one end of the bypass pipe close to the slide pipe.

[0009] Furthermore, the boiler feeding device also includes a first temperature sensor installed at the feeding end of the first screw conveyor, and the first temperature sensor is electrically connected to the first gate valve, the second gate valve and the solenoid valve. When the first temperature sensor detects that the temperature is greater than a preset value, the first gate valve and the second gate valve are actuated to close the slide pipe, and the solenoid valve opens.

[0010] Furthermore, the bypass pipe is arranged to be inclined downward in a direction away from the slide pipe.

[0011] Furthermore, the boiler feeding device also includes a spray pipe installed on the top of the silo, one end of the spray pipe is used for an external water source, the other end of the spray pipe is closed, and a plurality of spray ports are formed at the bottom of the spray pipe.

[0012] Furthermore, the boiler feeding device also includes a spray valve installed at the non-closed end of the spray pipe.

[0013] Furthermore, the boiler feeding device also includes a second temperature sensor installed in the silo, and the second temperature sensor is electrically connected to the spray valve. When the second temperature sensor detects that the temperature is greater than a preset value, the spray valve opens.

[0014] Furthermore, it also includes a DCS controller, which is electrically connected to the first temperature sensor and the second temperature sensor to receive temperature signals. The DCS controller is electrically connected to the first gate valve, the second gate valve, the solenoid valve and the spray valve to control the operation of the first gate valve, the second gate valve, the solenoid valve and the spray valve according to the temperature signals.

[0015] Furthermore, the first gate valve and the second gate valve are pneumatic gate valves, which include a valve seat, a gate and a cylinder. The cylinder is fixed to the side wall of the slide pipe via the valve seat, and the output end of the cylinder is connected to the gate, and one side of the gate can extend into the slide pipe.

[0016] Compared with the existing technology, the fuel is fed into the silo and is transported to the boiler in sequence through the second screw conveyor, the chute and the first screw conveyor. When the boiler operating condition deteriorates or the power of the induced draft fan decreases, the pressure in the boiler furnace increases, and the boiler feed port changes from negative pressure to positive pressure, and the high-temperature flue gas in the boiler flows into the feeding device. For this reason, an air locking component is set up to control the first gate valve and the second gate valve to block the bottom and top ends of the chute, which can prevent high-temperature flue gas from entering the silo and improve the safety performance of the boiler feeding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic diagram of the overall structure of a boiler feeding device with an air locking function provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0019] like Figure 1 As shown, the utility model provides a boiler feeding device with an air locking function, including a feeding component 100 and an air locking component 200, the feeding component 100 includes a first screw conveyor 110, a chute 120, a second screw conveyor 130 and a silo 140, the discharge end of the first screw conveyor 110 is connected to the boiler, the feeding end of the first screw conveyor 110 is connected to the bottom end of the chute 120, the chute 120 is inclined, the top end of the chute 120 is connected to the discharge end of the second screw conveyor 130, the feeding end of the second screw conveyor 130 is connected to the bottom of the silo 140, and the air locking component 200 includes a first gate valve 210 and a second gate valve 220 respectively installed at the bottom and top ends of the chute 120.

[0020] During implementation, the fuel is fed into the silo 140 and is sequentially transported to the boiler via the second screw conveyor 130, the chute 120 and the first screw conveyor 110. When the boiler operating condition deteriorates or the induced draft fan power decreases, the pressure in the furnace of the boiler increases, and the feed port of the boiler changes from negative pressure to positive pressure, and the high-temperature flue gas in the boiler flows into the feeding device. For this purpose, the air locking component 200 is set to control the first gate valve 210 and the second gate valve 220 to block the bottom and top ends of the chute 120, thereby preventing the high-temperature flue gas from entering the silo 140 and improving the safety performance of the boiler feeding device.

[0021] In this embodiment, the first screw conveyor 110 and the second screw conveyor 130 are arranged horizontally, and the slide pipe 120 is arranged obliquely upward in a direction away from the second screw conveyor 130 .

[0022] It can be understood that the first screw conveyor 110 and the second screw conveyor 130 both include a feeding pipe, a motor and a screw, one end of the feeding pipe is the discharge end, the other end of the feeding pipe is closed and a feeding end is formed on the top, the screw is coaxially built into the feeding pipe and is rotatably connected to the feeding pipe, and the output end of the motor is connected to the screw.

[0023] The air lock assembly 200 in this embodiment also includes a bypass pipe 230 connected to the slide pipe 120. The bypass pipe 230 is installed on one side of the slide pipe 120 along its inclined direction. A solenoid valve is installed at one end of the bypass pipe 230 close to the slide pipe 120.

[0024] In one embodiment, the first gate valve 210 and the second gate valve 220 are pneumatic gate valves, which include a valve seat, a gate and a cylinder. The cylinder is fixed to the side wall of the slide pipe 120 via the valve seat, and the output end of the cylinder is connected to the gate, and one side of the gate can extend into the slide pipe 120.

[0025] After the first gate valve 210 and the second gate valve 220 block the bottom and top ends of the slide pipe 120, the fuel in the slide pipe 120 can be discharged through the bypass pipe 230. At the same time, the high-temperature flue gas can also be discharged from the bypass pipe 230. It can be understood that the bypass pipe 230 can be connected to the cooling chamber to cool the fuel and the high-temperature flue gas.

[0026] In order to facilitate the detection of whether there is backflow of high-temperature flue gas, in one embodiment, the boiler feeding device further includes a first temperature sensor installed at the feeding end of the first screw conveyor 110. The first temperature sensor is electrically connected to the first gate valve 210, the second gate valve 220 and the solenoid valve. When the first temperature sensor detects that the temperature is greater than a preset value, the first gate valve 210 and the second gate valve 220 are actuated to close the slide pipe 120, and the solenoid valve is opened.

[0027] In one embodiment, the bypass pipe 230 is arranged to be inclined downward in a direction away from the slide pipe 120 .

[0028] If the first and second gate valves 210 and 220 fail, in one embodiment, the boiler feeding device further includes a spray pipe 400 installed on the top of the silo 140. One end of the spray pipe 400 is used for external water source, and the other end of the spray pipe 400 is closed. The bottom of the spray pipe 400 is formed with multiple spray ports to cool down the silo 140 and extinguish the fire.

[0029] The boiler feeding device further includes a spray valve installed at the non-closed end of the spray pipe 400 .

[0030] In order to facilitate the detection of whether high-temperature flue gas flows into the silo 140, in one embodiment, the boiler feeding device further includes a second temperature sensor installed in the silo 140. The second temperature sensor is electrically connected to the spray valve. When the second temperature sensor detects that the temperature is greater than a preset value, the spray valve opens.

[0031] This embodiment also includes a DCS controller 300, which is electrically connected to the first temperature sensor and the second temperature sensor to receive temperature signals. The DCS controller 300 is electrically connected to the first gate valve 210, the second gate valve 220, the solenoid valve, and the spray valve to control the operation of the first gate valve 210, the second gate valve 220, the solenoid valve, and the spray valve according to the temperature signals.

[0032] It is understandable that the DCS controller 300 is a structure that can be imagined by those skilled in the art to control the corresponding valve body movement according to the feedback signal of the temperature sensor.

[0033] Compared with the existing technology: the fuel is fed into the silo 140 and is transported to the boiler in sequence through the second screw conveyor 130, the chute 120 and the first screw conveyor 110. When the boiler operating condition deteriorates or the power of the induced draft fan decreases, the pressure in the furnace of the boiler increases, and the feed port of the boiler changes from negative pressure to positive pressure, and the high-temperature flue gas in the boiler flows into the feeding device. For this purpose, the air locking component 200 is set to control the first gate valve 210 and the second gate valve 220 to block the bottom and top ends of the chute 120, which can prevent the high-temperature flue gas from entering the silo 140 and improve the safety performance of the boiler feeding device.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A boiler feeding device with air locking function, characterized in that: include: A feeding assembly comprising a first screw conveyor, a chute, a second screw conveyor, and a silo, wherein the discharge end of the first screw conveyor is connected to the boiler, the feed end of the first screw conveyor is connected to the bottom end of the chute, the chute is arranged at an angle, the top end of the chute is connected to the discharge end of the second screw conveyor, and the feed end of the second screw conveyor is connected to the bottom of the silo; The air lock assembly comprises a first gate valve and a second gate valve respectively installed at the bottom end and the top end of the slide pipe.

2. The boiler feeding device with air locking function according to claim 1, characterized in that: The first screw conveyor and the second screw conveyor are arranged horizontally, and the slide pipe is arranged obliquely upward in a direction away from the second screw conveyor.

3. The boiler feeding device with air locking function according to claim 1, characterized in that: The air lock assembly also includes a bypass pipe connected to the slide pipe, the bypass pipe is installed on one side of the slide pipe along its inclined direction, and a solenoid valve is installed at one end of the bypass pipe close to the slide pipe.

4. The boiler feeding device with air locking function according to claim 3, characterized in that: The boiler feeding device also includes a first temperature sensor installed at the feeding end of the first screw conveyor. The first temperature sensor is electrically connected to the first gate valve, the second gate valve and the solenoid valve. When the first temperature sensor detects that the temperature is greater than a preset value, the first gate valve and the second gate valve are actuated to close the slide pipe, and the solenoid valve is opened.

5. The boiler feeding device with air locking function according to claim 3, characterized in that: The bypass pipe is arranged to be inclined downward in a direction away from the slide pipe.

6. The boiler feeding device with air locking function according to claim 4, characterized in that: The boiler feeding device also includes a spray pipe installed on the top of the silo, one end of the spray pipe is used for an external water source, the other end of the spray pipe is closed, and a plurality of spray ports are formed at the bottom of the spray pipe.

7. The boiler feeding device with air locking function according to claim 6, characterized in that: The boiler feeding device further comprises a spray valve installed at the non-closed end of the spray pipe.

8. The boiler feeding device with air locking function according to claim 7, characterized in that: The boiler feeding device further includes a second temperature sensor installed in the silo, the second temperature sensor is electrically connected to the spray valve, and when the second temperature sensor detects a temperature greater than a preset value, the spray valve opens.

9. The boiler feeding device with air locking function according to claim 8, characterized in that: It also includes a DCS controller, which is electrically connected to the first temperature sensor and the second temperature sensor to receive temperature signals. The DCS controller is electrically connected to the first gate valve, the second gate valve, the solenoid valve and the spray valve to control the operation of the first gate valve, the second gate valve, the solenoid valve and the spray valve according to the temperature signals.

10. The boiler feeding device with air locking function according to claim 4, characterized in that: The first and second gate valves are pneumatic gate valves, each comprising a valve seat, a gate, and a cylinder. The cylinder is fixed to the side wall of the slide pipe via the valve seat, and the output end of the cylinder is connected to the gate. One side of the gate can extend into the slide pipe.

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