Device and method for preventing spontaneous combustion of coking coal through microwave preheating
The microwave preheating coking coal device, with its dual-cavity structure and gas detection control, solves the problem of spontaneous combustion of coal, enables the smooth discharge of water vapor and the control of oxygen content, and ensures coking safety.
Patent Information
- Application Number
- CN202511820575.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-01-30
AI Technical Summary
When microwave preheating coking coal, the upper layer of coal forms an isolation layer that hinders the diffusion of moisture, causing the temperature of the middle layer of coal to rise and making it prone to spontaneous combustion, which poses a safety hazard.
The coal storage silo adopts a dual-cavity structure. The inner cavity stores the coal, while the outer cavity serves as a water vapor channel. The oxygen content is monitored by a gas detector to control the delivery of non-combustible gases and prevent spontaneous combustion of the coal.
It effectively removes water vapor, prevents spontaneous combustion of coal, ensures low oxygen content, and improves the stability and safety of coal preheating temperature.
Smart Images
Figure CN121427554A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of coking technology, and in particular relates to a microwave preheating device and method for preventing spontaneous combustion of coking coal. Background Technology
[0002] When microwave preheating coking coal, especially when heating the middle and bottom layers, an insulating layer forms in the upper layer, hindering the diffusion of moisture from the lower layer. This creates a "smoldering" effect, causing the temperature of the middle layer to rise while moisture cannot effectively escape, resulting in unstable and continuous operation of the dried coal. Simultaneously, microwave preheating of coking coal makes it more susceptible to reaction with oxygen, especially in high-temperature or poorly ventilated feeding systems, greatly increasing the risk of localized spontaneous combustion or even fires. This can easily lead to safety accidents in production. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a microwave preheating device and method for preventing spontaneous combustion of coking coal, so as to ensure that the oxygen content in the coal storage silo is low, thereby avoiding the phenomenon of spontaneous combustion of coal.
[0004] To achieve the above objectives, the present invention employs the following technical solution: A microwave preheating device for preventing spontaneous combustion of coking coal, comprising: The coal storage silo has an internal layer that divides the silo into an inner cavity and an outer cavity. The inner cavity is used to store coal, while the outer cavity serves as a water vapor passage. Multiple breather valves are provided on the top and outer periphery of the outer cavity of the storage tank; Microwave heating equipment is installed on the bottom outer perimeter of the coal storage silo to heat and dry the coal inside the silo. Nitrogen cylinders are used to store nitrogen and transport it to the outer cavity of the coal storage silo via pipelines. Gas cylinder valve, located on the pipeline from the gas cylinder to the coal storage silo; The gas detector, located at the top of the outer cavity of the storage silo, detects the oxygen content of the gas inside the coal storage silo. The control module is used to receive signals from the oxygen content of the gas in the coal storage silo and the working signals of the microwave heating equipment, and to control the opening and closing of the gas tank valves.
[0005] A method for operating a microwave preheating device for preventing spontaneous combustion of coking coal includes: When the microwave heating equipment is working, if the oxygen content of the gas in the coal storage bin detected by the gas detector is ≤1%, the control module closes the gas tank valve. When the oxygen content of the gas in the coal storage bin detected by the gas detector is greater than 1%, the control module opens the gas cylinder valve and the gas cylinder delivers gas into the coal storage bin until the oxygen content of the gas detected by the gas detector is less than or equal to 1%, then the gas cylinder valve is closed. When the microwave heating equipment is not working, the control module keeps the gas tank valve closed.
[0006] Compared with existing technologies, the beneficial effects of this invention are: This invention utilizes a dual-cavity coal storage silo. The inner cavity serves as a coal passage, while the outer cavity acts as a moisture passage. This allows moisture generated during the heating and drying process of the coal located at the bottom of the silo to be effectively discharged. The introduction of non-combustible gases into the silo prevents spontaneous combustion of the coal, thereby enabling the coking coal to be preheated to higher temperatures. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the structure of the present invention.
[0008] Figure 2 This is a schematic diagram of the coal storage silo.
[0009] In the diagram: 1. Coal storage bin, 1.1. Inner cavity of storage bin, 1.2. Outer cavity of storage bin, 2. Breathing valve, 3. Microwave heating equipment, 4. Gas tank, 5. Conveying pipeline, 6. Gas tank valve, 7. Gas detector, 8. Control module. Detailed Implementation
[0010] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.
[0011] A microwave preheating device for preventing spontaneous combustion of coking coal, comprising: The coal storage silo 1 has an internal layer that divides the coal storage silo into an inner cavity 1.1 and an outer cavity 1.2. The inner cavity 1.1 is used to store coal; the outer cavity 1.2 serves as a water vapor passage. Multiple breather valves 2 are provided on the top and outer periphery of the outer cavity 1.2 of the storage chamber; Microwave heating device 3 is installed on the bottom outer periphery of coal storage silo 1 and is used to heat and dry the coal in coal storage silo 1. Gas tank 4 is used to store nitrogen or waste gas with an oxygen content of ≤1%, and is transported to the outer cavity 1.2 of the coal storage silo through the conveying pipeline 5; non-combustible gas is introduced to prevent spontaneous combustion of coal.
[0012] Gas cylinder valve 6 is located on the conveying pipeline 5 from gas cylinder 4 to coal storage silo 1; Gas detector 7, located at the top of the outer cavity 1.2 of the storage silo, detects the oxygen content of the gas inside the coal storage silo 1; The control module 8 is used to receive the oxygen content of the gas in the coal storage silo 1 and the working signal of the microwave heating equipment 3, and to control the opening and closing of the gas tank valve 6.
[0013] A method for operating a microwave preheating device for preventing spontaneous combustion of coking coal includes: When the microwave heating equipment 3 is working, if the oxygen content of the gas in the coal storage bin 1 detected by the gas detector 7 is ≤1%, the control module 8 closes the gas tank valve 6. When the oxygen content of the gas in the coal storage silo 1 detected by the gas detector 7 is greater than 1%, the control module 8 opens the gas cylinder valve 6, and the gas cylinder 4 delivers gas into the coal storage silo 1 until the oxygen content of the gas detected by the gas detector 7 is less than or equal to 1%, and then closes the gas cylinder valve 6. When the microwave heating device 3 is not working, the control module 8 controls the gas tank valve 6 to remain closed.
[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0015] Example: A microwave preheating device for preventing spontaneous combustion of coking coal, comprising: Coal storage bin 1 is located on the coke oven coal charging car, and the volume of a single coal storage bin is 20m³. 3 The coal storage silo 1 has an inner layer that divides the coal storage silo into an inner cavity 1.1 and an outer cavity 1.2. The inner cavity 1.1 is used to store coal; the outer cavity 1.2 is used as a water vapor passage; the volume ratio of the inner cavity to the outer cavity is 19:1. Six breathing valves 2 are installed at the top of the outer cavity 1.2 of the storage chamber, and ten breathing valves 2 are installed on the outer periphery; Gas tank 4 is used to store nitrogen or waste gas with an oxygen content of ≤1%, and is transported to the outer cavity of coal storage silo 1 through conveying pipeline 5; non-combustible gas is introduced to prevent spontaneous combustion of coal. Gas cylinder valve 6 is located on the conveying pipeline 5 from gas cylinder 4 to coal storage silo 1; Gas detector 7, located at the top of the outer cavity 1.2 of the storage silo, detects the oxygen content of the gas inside the coal storage silo 1; The control module 8 is used to receive the oxygen content of the gas in the coal storage silo 1 and the working signal of the microwave heating equipment 3, and to control the opening and closing of the gas tank valve 6.
[0016] The microwave heating device 3 is installed on the bottom outer periphery of the coal storage silo 1 and is used to heat and dry the coal in the coal storage silo 1; the microwave frequency is 2450±25MHz and the heating power is 50kW.
[0017] A method for operating a microwave preheating coking coal anti-spontaneous combustion device: When the coking coal charging car starts charging coal into the coking oven, the microwave heating equipment 3 starts working. The gas detector 7 detects that the oxygen content in the coal storage silo 1 is 20%. The control module 8 opens the gas cylinder valve 6 to introduce nitrogen into the coal storage silo 1 until the oxygen content in the gas detected by the gas detector 7 is ≤1%, and then closes the gas cylinder valve 6. When the coke oven coal charging operation stops, the microwave heating equipment 3 is stopped, and the control module 8 controls the gas tank valve 6 to remain closed.
[0018] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A device for preventing spontaneous combustion of coking coal preheated by microwaves, characterized in that, The utility model relates to a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying.
2. The working method of the anti-static device for preheating coking coal by microwave according to claim 1, characterized in that, The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin and a microwave heating device for drying coal, and belongs to the field of coal drying. The utility model discloses a coal storage bin