Lignite drying device
By designing a system that integrates raw coal production equipment, dryers, condensate recovery devices and waste heat heating components, the waste heat waste and environmental pollution during lignite drying is solved, and efficient recycling and utilization of waste heat is achieved, operating costs are reduced and operational safety and efficiency are improved.
Patent Information
- Application Number
- CN202422414623.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The existing lignite drying equipment has waste heat and environmental pollution problems during the drying process, and the operating costs are high.
A system including raw coal production equipment, dryers, condensate recovery devices, dust collectors and waste heat heating components was designed. By effectively connecting these components, waste heat recovery and automated control are achieved to reduce energy waste and environmental pollution.
It realizes efficient recycling and utilization of waste heat, reduces operating costs, reduces environmental pollution, and improves operational safety and efficiency.
Smart Images
Figure CN223271557U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lignite production, and specifically provides a lignite drying device. Background Art
[0002] The drying medium temperature of the steam tube dryer is between 140℃ and 175℃, and the temperature of the wet flue gas discharged after lignite drying is only about 100℃. Compared with the development and utilization of high- and medium-temperature industrial waste heat, the waste heat of low-grade flue gas is generally not utilized. The direct discharge of this part of waste heat will cause a lot of energy waste on the one hand, and will also cause environmental thermal pollution on the other hand. In order to ensure the normal operation of the drying equipment in winter, the drying plant needs to be heated by an external heat source, which increases operating costs.
[0003] Accordingly, the art requires a new lignite drying device to solve the above technical problems. Utility Model Content
[0004] The utility model aims to solve the above technical problem, that is, to solve the problem of waste heat during the existing lignite drying.
[0005] The utility model provides a lignite drying device, which includes raw coal production equipment, a dryer, a condensate recovery device, a dust collector and a waste heat heating component, wherein:
[0006] The raw coal production equipment is used to crush large coal blocks and transport the crushed coal blocks to the drying assembly;
[0007] The flue gas outlet of the dryer is connected to the dust collector, and the steam outlet of the dryer is connected to the condensate recovery device; the dry coal outlet of the dryer and the pulverized coal outlet of the dust collector are both connected to the material port of the conveyor to transport the dried dry coal and pulverized coal to the outside; the air outlet of the dust collector is connected to the inlet of the induced draft fan;
[0008] The waste heat heating component includes a heat exchange device and a heat dissipation terminal. The heat exchange device is provided with an induced draft fan, and the outlet of the induced draft fan is connected to the inlet of the filter; a filter is provided inside the heat exchange device for filtering out smoke dust in the flue gas; a flue gas heat exchanger is provided inside the heat exchange device, and the flue gas inlet of the flue gas heat exchanger is connected to the outlet of the filter; the flue gas outlet of the flue gas heat exchanger is discharged to the outside, and the water outlet of the flue gas heat exchanger is connected to the inlet of the heat dissipation terminal, and the outlet of the heat dissipation terminal is connected to the water inlet of the heat exchange device through a water pump.
[0009] Based on the above settings, the device directly processes large coal blocks through the raw coal production equipment, which reduces the need for separate crushing equipment, thereby reducing capital investment and operating costs; at the same time, the crushed coal blocks are directly transported to the drying component, which reduces the possibility of material loss and cross-contamination during the processing process and improves the utilization rate of raw materials; through the waste heat heating component, the system can recover the heat energy generated during the drying process and use it for other heating needs or heating, thereby reducing dependence on external heat sources; this not only reduces energy costs, but also reduces environmental emissions; the condensate recovery device can recover the liquid converted from the steam generated during the drying process, reducing the waste of water resources. The setting of the dust collector effectively removes the dust and particulate matter released during the drying process, reduces pollution to the surrounding environment, and meets the high standards of modern industry for environmental protection; due to the effective connection between the main components such as the dryer, condensate recovery device and dust collector, the entire system can achieve a higher level of automated control, reducing the need for manual operation and improving operational safety and efficiency.
[0010] In the preferred technical solution of the above-mentioned detection structure, the waste heat heating component also includes a first flow regulating valve and a second flow regulating valve. The first flow regulating valve is arranged at the connection between the induced draft fan and the filter. The first flow regulating valve is provided with an exhaust port for directly exhausting a small amount of flue gas; the second flow regulating valve is arranged at the connection between the filter and the heat exchange equipment.
[0011] Based on the above settings, by setting two flow regulating valves (the first and second flow regulating valves), the flow of flue gas can be controlled more finely, allowing part of the flue gas to be directly discharged through the first flow regulating valve, thereby reducing the burden on the heat exchange equipment and improving the utilization rate of thermal energy, thereby ensuring the flexibility and responsiveness of the system.
[0012] In the preferred technical solution of the above detection structure, the first flow regulating valve and the second flow regulating valve are both pneumatic flow regulating valves.
[0013] Based on the above setup, these valves are particularly suitable for industrial applications requiring fine regulation due to their fast and precise control characteristics; in this system, they ensure stable and efficient management of flue gases and heat in complex industrial environments.
[0014] In a preferred technical solution of the above detection structure, a thermal resistance thermometer is installed on the heat dissipation end.
[0015] Based on the above setup, installing a resistance thermometer can monitor the system's operating temperature in real time, which is crucial to preventing overheating and ensuring the system operates at the optimal temperature, thereby improving the system's safety and energy efficiency.
[0016] In a preferred technical solution of the above detection structure, a steam trap is provided on the flue gas outlet of the heat exchange equipment.
[0017] Based on the above settings, installing a steam trap at the flue gas outlet of the heat exchange equipment helps to effectively remove moisture from the flue gas, reduce corrosion and scale accumulation inside the system, extend the life of the equipment, and maintain heat exchange efficiency.
[0018] In the preferred technical solution of the above detection structure, the dryer is a steam tube dryer, the steam pressure of the steam tube dryer is 0.4-0.6MPaG, the temperature is 140-175°C, and the flue gas temperature at the outlet is 90-110°C.
[0019] Based on the above settings, the dryer is designed to operate within a steam pressure range of 0.4 to 0.6 MPaG and a temperature range of 140 to 175°C. These parameters provide an ideal thermal environment for efficient drying of the coal. At the same time, the outlet flue gas temperature is controlled at 90 to 110°C to ensure maximum energy recovery.
[0020] In the preferred technical solution of the above detection structure, the water pump is a variable frequency circulating water pump, and the temperature of the inlet high-temperature circulating water at the heat dissipation end is 45°C to 55°C.
[0021] Based on the above settings, by using variable frequency technology to adjust the speed of the circulating water pump, the water flow rate and temperature can be adjusted according to actual needs. This flexibility helps save energy and adapt to different operating conditions.
[0022] In the preferred technical solution of the above detection structure, the filter is a high-temperature resistant backwash filter.
[0023] Based on the above settings, the filter is designed to effectively remove particulate matter from flue gas under high temperature conditions. The backwashing function ensures the long-term stability and low maintenance of the filter, making it an ideal choice for handling suspended particles in hot flue gas.
[0024] In a preferred technical solution of the above detection structure, the dryer and the conveyor are connected via a screw feeding device, and the lignite is pushed from the dryer to the conveyor via the screw feeding device.
[0025] Based on the above settings, the spiral feeding device provides a continuous and gentle material conveying method, reducing the breakage and separation of materials during the transmission process, and improving the uniformity and efficiency of the entire drying process.
[0026] In the preferred technical solution of the above detection structure, the conveyor is a buried scraper conveyor.
[0027] Based on the above settings, this conveyor is designed to handle material handling under heavy loads and high wear conditions. It is particularly suitable for conveying dry coal and coal powder after drying, providing a stable and reliable material transportation solution with reduced operating costs and maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
[0029] Figure 1 Shown is the overall structural flow chart of the utility model.
[0030] Reference numerals:
[0031] 1. Crusher; 2. Raw coal silo; 3. Coal feeder; 4. Dryer; 5. Screw conveyor; 6. Buried scraper conveyor; 7. Dust collector; 8. Induced draft fan; 9. Condensate recovery device; 10. Filter; 11. Flue gas heat exchanger; 12. Heat dissipation terminal; 13. Circulating water pump; 14. First flow control valve; 15. Thermal resistance thermometer; 16. Second flow control valve; 17. Steam trap. DETAILED DESCRIPTION
[0032] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.
[0033] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the structure described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as limiting the utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance.
[0034] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connection" should be understood in a broad sense. For example, they can refer to fixed connections or detachable connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0035] See first Figure 1 ,like Figure 1As shown, the present invention provides a lignite drying device, which includes a raw coal production device, a dryer 4, a condensate recovery device 9, a dust collector, and a waste heat heating component, wherein: the raw coal production device is used to crush large coal blocks and transport the crushed coal blocks to the drying component; it should be noted that the present invention does not impose any restrictions on the specific structure of the raw coal production device, and those skilled in the art can set it according to their needs, as long as the normal production of lignite is guaranteed. In this preferred embodiment, the raw coal production equipment includes a crusher 1, a raw coal bin 2, and a coal feeder 3. The outlet of the crusher 1 is connected to the raw coal bin 2 and the coal feeder 3 in sequence, and finally transported to the dryer 4 through the coal feeder 3;
[0036] The flue gas outlet of the dryer 4 is connected to the dust collector 7, and the steam outlet of the dryer 4 is connected to the condensate recovery device 9; the dry coal outlet of the dryer 4 and the coal powder outlet of the dust collector 7 are both connected to the material port of the conveyor to transport the dried dry coal and coal powder to the outside; it should be noted that the present invention does not impose any restrictions on the specific type of the dryer 4, and those skilled in the art can set it according to their needs. For example, the dryer 4 can be a normal pressure dryer 4, and for another example, the dryer 4 can also be a vacuum dryer 4, as long as it is ensured that the dryer 4 can well complete the task of drying the lignite. In this preferred embodiment, the dryer 4 is a steam tube dryer 4 having a steam pressure of 0.4-0.6 MPaG, a temperature of 140-175°C, and an outlet flue gas temperature of 90-110°C. The dryer 4 is designed to operate within a steam pressure range of 0.4-0.6 MPaG and a temperature range of 140-175°C. These parameters provide an ideal thermal environment for efficient drying of coal. The outlet flue gas temperature is controlled at 90-110°C, ensuring maximum energy recovery. The air outlet of the dust collector 7 is connected to the inlet of the induced draft fan 8.
[0037] The waste heat heating assembly includes a heat exchanger and a heat sink 12. The heat exchanger is equipped with an induced draft fan 8, the outlet of which is connected to the inlet of a filter 10. A filter 10 is installed within the heat exchanger to filter out soot from the flue gas. The flue gas outlet of the heat exchanger is exhausted to the outside, and the water outlet of the heat exchanger is connected to the inlet of the heat sink 12. The outlet of the heat sink 12 is connected to the water inlet of the heat exchanger via a water pump. It should be noted that the present invention does not impose any limitations on the specific structure of the filter 10. Those skilled in the art may customize the structure based on their needs. For example, the filter 10 may be an electrostatic filter 10, or a mechanical filter 10, as long as the filter 10 can completely remove the lignite from the flue gas. In this preferred embodiment, the filter 10 is a high-temperature resistant backwash filter 10. This filter 10 is designed to effectively remove particulate matter from flue gas under high temperature conditions. The backwash function ensures the long-term stability and low maintenance of the filter 10, making it an ideal choice for treating suspended particulates in hot flue gas.
[0038] As a preferred embodiment, the water pump is a variable frequency circulating water pump 13, and the temperature of the high-temperature circulating water inlet of the heat dissipation terminal 12 is 45°C to 55°C. By using variable frequency technology to adjust the speed of the circulating water pump 13, the flow rate and temperature of the water can be adjusted according to actual needs. This flexibility helps save energy and adapt to different operating conditions. It should be noted that the present invention does not impose any restrictions on the specific type of water pump. Those skilled in the art can set it according to their needs, as long as the water pump can meet the water needs of the heat exchange equipment and the heat dissipation terminal 12.
[0039] In addition, it should be noted that the present invention does not impose any restrictions on the connection method between the various devices. Those skilled in the art can set it according to their needs, as long as the transportation method of flue gas and lignite is stable.
[0040] The device processes large coal lumps directly through the raw coal production equipment, which reduces the need for separate crushing equipment, thereby reducing capital investment and operating costs. At the same time, the crushed coal lumps are directly transported to the drying component, reducing the possibility of material loss and cross-contamination during the processing process, and improving raw material utilization. Through the waste heat heating component, the system can recover the heat energy generated during the drying process and use it for other heating needs or heating, thereby reducing dependence on external heat sources. This not only reduces energy costs but also reduces environmental emissions. The condensate recovery device 9 can recover the liquid converted from the steam generated during the drying process, reducing the waste of water resources. The dust collector is set up to effectively remove dust and particulate matter released during the drying process, reducing pollution to the surrounding environment and meeting the high standards of modern industry for environmental protection. Due to the effective connection between the main components such as the dryer 4, the condensate recovery device 9 and the dust collector, the entire system can achieve a high level of automated control, reducing the need for manual operation and improving operational safety and efficiency.
[0041] Furthermore, the waste heat heating component also includes a first flow regulating valve 14 and a second flow regulating valve 16. The first flow regulating valve 14 is arranged at the connection between the induced draft fan 8 and the filter 10. The first flow regulating valve 14 is provided with an exhaust port for directly exhausting a small amount of flue gas. The second flow regulating valve 16 is arranged at the connection between the filter 10 and the heat exchange device. It should be noted that the present invention does not impose any restrictions on the specific types of the first flow regulating valve 14 and the second flow regulating valve 16. Those skilled in the art can set them as needed. For example, the first flow regulating valve 14 and the second flow regulating valve 16 can be butterfly valves. For another example, the first flow regulating valve 14 and the second flow regulating valve 16 can also be ball valves. As long as the first flow regulating valve 14 and the second flow regulating valve 16 can timely and accurately regulate the flow of gas in the pipeline, it will be sufficient. By providing two flow control valves (first and second flow control valves 16), the flow of flue gas can be more precisely controlled, allowing some flue gas to be directly discharged through the first flow control valve 14. This reduces the burden on the heat exchange equipment, improves thermal energy utilization, and ensures system flexibility and responsiveness. In this preferred embodiment, both the first flow control valve 14 and the second flow control valve 16 are pneumatic flow control valves. Due to their fast and precise control characteristics, these valves are particularly suitable for industrial applications requiring fine adjustment. In this system, they ensure stable and effective management of flue gas and thermal energy in complex industrial environments.
[0042] Furthermore, a resistance thermometer 15 is mounted on the heat dissipation terminal 12. Installing the resistance thermometer 15 allows for real-time monitoring of the system's operating temperature, which is crucial for preventing overheating and ensuring the system operates at the optimal temperature, thereby improving system safety and energy efficiency. It should be noted that the present invention does not impose any restrictions on the specific structure of the resistance thermometer 15. Those skilled in the art may customize the structure as needed, as long as the resistance thermometer 15 can accurately measure temperature.
[0043] Furthermore, a steam trap 17 is provided on the flue gas outlet of the heat exchange equipment. Providing a steam trap 17 at the flue gas outlet of the heat exchange equipment helps to effectively remove moisture from the flue gas, reduce corrosion and scale accumulation inside the system, extend the life of the equipment, and maintain heat exchange efficiency. It should be noted that the present invention does not impose any restrictions on the specific type of steam trap 17. Those skilled in the art can set it according to their needs, as long as it is ensured that the steam trap 17 can effectively remove moisture from the flue gas. The dryer 4 and the conveyor are connected by a screw feeding device 5, and the lignite is pushed from the dryer 4 to the conveyor through the screw feeding device 5. The screw feeding device provides a continuous and gentle material conveying method, reduces the breakage and separation of the material during the transmission process, and improves the uniformity and efficiency of the entire drying process. It should be noted that the present invention does not provide a connection between the dryer 4 and the conveyor. In this preferred embodiment, the conveyor is a buried scraper conveyor 6. This conveyor is designed to handle heavy loads and high-abrasion material handling conditions. It is particularly suitable for conveying dry coal and coal powder after drying. It provides a stable and reliable material transportation solution and reduces operating costs and maintenance requirements.
[0044] Thus far, the technical solutions of the present invention have been described in conjunction with the optional embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.
Claims
1. A lignite drying device, characterized in that: The drying device includes raw coal production equipment, a dryer, a condensate recovery device, a dust collector and a waste heat heating component, wherein: The raw coal production equipment is used to crush large coal blocks and transport the crushed coal blocks to the drying assembly; The flue gas outlet of the dryer is connected to the dust collector, and the steam outlet of the dryer is connected to the condensate recovery device; the dry coal outlet of the dryer and the pulverized coal outlet of the dust collector are both connected to the material port of the conveyor to transport the dried dry coal and pulverized coal to the outside; The waste heat heating component includes a heat exchange device and a heat dissipation terminal. The heat exchange device is provided with an induced draft fan, and the air outlet of the dust collector is connected to the inlet of the induced draft fan; a filter is provided inside the heat exchange device for filtering out smoke dust in the flue gas; the outlet of the induced draft fan is connected to the inlet of the filter; a flue gas heat exchanger is provided inside the heat exchange device, and the smoke inlet of the flue gas heat exchanger is connected to the outlet of the filter; the smoke outlet of the flue gas heat exchanger is discharged to the outside, and the water outlet of the flue gas heat exchanger is connected to the inlet of the heat dissipation terminal, and the outlet of the heat dissipation terminal is connected to the water inlet of the heat exchange device through a water pump.
2. The drying device according to claim 1, characterized in that The waste heat heating component also includes a first flow regulating valve and a second flow regulating valve. The first flow regulating valve is arranged at the connection between the induced draft fan and the filter. The first flow regulating valve is provided with an exhaust port for directly exhausting a small amount of flue gas; the second flow regulating valve is arranged at the connection between the filter and the heat exchange equipment.
3. The drying device according to claim 2, characterized in that The first flow regulating valve and the second flow regulating valve are both pneumatic flow regulating valves.
4. The drying device according to claim 1, characterized in that A thermal resistance thermometer is installed on the heat dissipation end.
5. The drying device according to claim 1, characterized in that A steam trap is provided on the flue gas outlet of the heat exchange equipment.
6. The drying device according to claim 1, characterized in that The dryer is a steam tube dryer, the steam pressure of the steam tube dryer is 0.4-0.6 MPaG, the temperature is 140-175°C, and the flue gas temperature at the outlet is 90-110°C.
7. The drying device according to claim 6, characterized in that The water pump is a variable frequency circulating water pump, and the temperature of the inlet high-temperature circulating water at the heat dissipation end is 45°C to 55°C.
8. The drying device according to claim 7, characterized in that The filter is a high temperature resistant backwash filter.
9. The drying device according to claim 1, characterized in that The dryer and the conveyor are connected via a screw feeding device, and the lignite is pushed from the dryer to the conveyor via the screw feeding device.
10. The drying device according to claim 9, characterized in that The conveyor is a buried scraper conveyor.