Device for drying as-fired pulverized coal
By utilizing the centrifugal force of the drum and compressed air drying technology, the problem of coal caking in thermal power plants has been solved through the coal pulverizer drying device, achieving efficient drying of coal pulverizer and improving production safety and economic benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG DATANG INT LEIZHOU POWER GENERATION CO
- Filing Date
- 2025-07-02
- Publication Date
- 2026-05-15
AI Technical Summary
In existing technologies, coal fed into thermal power plants is prone to caking and sticking, leading to malfunctions in the pulverizing system. Manual handling is inefficient and poses safety hazards.
The coal powder drying device uses a drum centrifugal force and compressed air drying technology. The coal is slowed down as it enters the raw coal bunker by a spiral wall track. The coal powder is dried by centrifugal force and compressed air to avoid caking.
It effectively avoids coal caking, reduces pulverizing system failures, improves production safety and economic efficiency, and saves manpower and resources.
Smart Images
Figure CN224246617U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a device for drying pulverized coal fed into a furnace. Background Technology
[0002] The raw coal in the coal bunker is often sticky and lumpy, and tapping and rapping are routine operations in thermal power plants. The coal fed into the furnace is the lifeblood of a thermal power plant, directly affecting its safe operation and economic benefits. Currently, the coal blending in coal-fired power plants is complex, deviating significantly from design values. The coal inevitably has high moisture content and viscosity, making it prone to caking and sticking under gravity. This can cause problems such as pulverizing system malfunctions, coal shortages, and large load tracking deviations. To address this, power plants generally use manual tapping and rapping to clear the coal. However, manual processing is time-consuming and inefficient. Improper rapping can easily cause injuries, and in severe cases, coal bunker collapses. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a device for drying pulverized coal fed into the furnace.
[0004] The above objectives are achieved through the following technical solutions:
[0005] A device for drying pulverized coal fed into a furnace comprises: a drum, a platform frame, and a compressed air tank. The drum and the platform frame are connected by bearings. The compressed air tank is connected to a compressed air pipe, which is connected to two η-pipes. The η-pipes are inserted into the drum, and multiple compression nozzles are fixed on the pipes.
[0006] The aforementioned drying device for pulverized coal fed into the furnace includes a toothed ring fixed to the outside of the drum, a power motor fixed on the platform frame, the output shaft end of the power motor being fixed to a drive gear, and the drive gear meshing with the toothed ring.
[0007] The aforementioned drying device for pulverized coal fed into the furnace has a spiral wall-mounted track on the inner wall of the drum. Beneficial effects
[0008] 1. This utility model uses a spiral wall-mounted track to slow down the amount of coal entering the raw coal bunker. It utilizes the combined action of centrifugal force of the drum and compressed air to dry the coal powder, preventing coal from caking and sticking, which could cause the pulverizing system to malfunction and shut down, resulting in production safety and economic losses. This can save the unit manpower, material resources and economic costs. Attached Figure Description
[0009] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0010] In the diagram: 1. Drum; 2. Power motor; 3. Spiral wall-mounted track; 4. Compressed air tank; 5. Compressed air nozzle; 6. Compressed air regulating valve; 7. Coal plow; 8. Compressed air pipe; 9. Belt conveyor; 10. Raw coal bunker; 11. Gear ring; 12. η-air pipe; 13. Drive gear; 14. Platform frame. Detailed Implementation
[0011] Reference Figure 1 A device for drying pulverized coal fed into a furnace comprises: a drum 1, a platform frame 14, and a compressed air tank 4. The drum and the platform frame are connected by bearings. The compressed air tank is connected to a compressed air pipe 8. A compressed air regulating valve 6 is installed on the compressed air pipe. The compressed air pipe is connected to two η-pipes 12. Both the η-pipes and the compressed air pipe are made of hard stainless steel. The η-pipes are inserted into the drum and have a gap between them and the spiral wall-mounted track on the inner wall of the drum so as not to affect the rotation of the drum. The η-pipes are inserted into the drum, and multiple compression nozzles 5 are fixed on the pipes.
[0012] The aforementioned drying device for pulverized coal fed into the furnace includes a toothed ring 11 fixed to the outside of the drum, a power motor 2 fixed on the platform frame, the output shaft end of the power motor being fixed to a drive gear 13, and the drive gear meshing with the toothed ring.
[0013] The aforementioned drying device for pulverized coal fed into the furnace has a spiral wall-mounted track 3 on the inner wall of the drum.
[0014] Working principle: Due to its high moisture content and viscosity, the coal entering the furnace clumps and sticks together under gravity, affecting the normal operation of the pulverizing system. The coal is conveyed by a belt and falls into the drum 1 after being plowed by the coal plower 7. The power motor starts and drives the gear to rotate. The drive gear meshes with the gear ring, thereby driving the drum to rotate and generating centrifugal force, which throws the coal into the furnace. The inner wall of the drum has a spiral wall-adhering track, which slows down the amount of coal and allows it to directly enter the raw coal bunker 10. After entering the drum, the power motor drives the drum to rotate, generating centrifugal force, which throws the coal into the furnace. At the same time, the pressure is adjusted by the compressed air pressure regulating valve 6, and the compressed air enters the η air pipe and is sprayed out through the compression nozzle. Under the action of compressed air and centrifugal force, the coal powder is dried.
Claims
1. A device for drying pulverized coal fed into a furnace, characterized in that: Its components include: a roller, a platform frame, and a compressed air tank. The roller and the platform frame are connected by bearings. The compressed air tank is connected to a compressed air pipe, which is connected to two η-pipes. The η-pipes are inserted into the roller, and multiple compression nozzles are fixed on the pipes.
2. The device for drying pulverized coal fed into the furnace according to claim 1, characterized in that: A toothed ring is fixed to the outside of the roller, and a power motor is fixed on the platform frame. The output shaft end of the power motor is fixed to a drive gear, and the drive gear meshes with the toothed ring.
3. The device for drying pulverized coal fed into the furnace according to claim 2, characterized in that: The inner wall of the roller has a spiral wall-attaching track.