Coke dewatering device with waste heat utilization

Abstract

The utility model discloses a coke dewatering device of waste heat utilization relates to coke processing field. The coke dewatering device of waste heat utilization includes drying box, hot blast furnace, induced draft fan, temperature monitoring unit, sieve, conveying belt and control system, and the inside of drying box is equipped with at least two layers of chain transmission mechanism, and the air inlet of drying box is connected with hot blast furnace through pipeline, and induced draft fan is located on the pipeline between hot blast furnace and drying box. The coke dewatering device of waste heat utilization recycles the waste gas waste heat of coke oven gas combustion through hot blast furnace, and the coke moisture is reduced through closed loop temperature control system and multilayer countercurrent drying box, which solves the adverse effect of high coke moisture on blast furnace production on one hand, and creates economic benefits for enterprises on the other hand, and the selling price of the coke after drying and dewatering is higher than that of the coke by conventional wet quenching.

Description

Technical Field

[0001] This utility model relates to the field of coke treatment technology, specifically to a coke dehydration device that utilizes waste heat. Background Technology

[0002] In industries such as petroleum refining and coal chemical processing, delayed coking is a key process for processing heavy oil. Its core is to convert residue oil into light oil products through high-temperature cracking, while generating solid coke.

[0003] Existing coking plants generally use wet quenching or simple air drying methods to process coke, resulting in a coke moisture content that is often between 10% and 15%. This not only reduces the calorific value and mechanical strength of the coke but also increases the energy consumption of blast furnace smelting. Simultaneously, a large amount of sensible heat is directly emitted with the coke oven exhaust gas, wasting energy and exacerbating environmental pollution. Traditional dehydration equipment lacks online temperature control and particle size classification functions, making it prone to spontaneous combustion of coke due to excessively high temperatures. Furthermore, it cannot differentiate between coke particles of different sizes, resulting in low overall operating efficiency and high safety risks. To address the shortcomings of existing technologies, this invention provides a coke dehydration device that utilizes waste heat to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a coke dehydration device that utilizes waste heat. It recovers the waste heat generated from the combustion of coke oven gas in a hot blast stove, and reduces the moisture content of the coke through a closed-loop temperature control system and a multi-layer counter-current drying box. On the one hand, it solves the adverse effects of high coke moisture on blast furnace production; on the other hand, it creates economic benefits for enterprises, as the price of dried and dehydrated coke is higher than that of coke produced by conventional wet quenching.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a coke dehydration device utilizing waste heat, comprising:

[0006] The drying oven has at least two layers of chain drive mechanisms inside, which are used to transport coke;

[0007] A hot air furnace is connected to the air inlet of the drying box via a pipe. The hot air furnace is used to supply hot exhaust gas to the drying box.

[0008] An induced draft fan is installed on the pipe between the hot air furnace and the drying box. The induced draft fan is used to draw hot waste gas into the drying box.

[0009] The temperature monitoring unit includes a first temperature sensor group located at the outlet pipe of the hot air furnace and a second temperature sensor group located at the exhaust gas outlet of the drying box.

[0010] A sluice screen is installed at the feed end of the drying box and is used to screen coke particle size.

[0011] The conveyor belt connects to the discharge port of the drying chamber;

[0012] The control system is connected to the temperature monitoring unit, the hot air furnace, and the induced draft fan, respectively, and is used to regulate the temperature of the hot exhaust gas.

[0013] Preferably, the chain drive mechanism consists of five parallel chain layers, with each layer of chains connected sequentially via a transmission device, and the coke is conveyed layer by layer from the top chain to the bottom chain for output.

[0014] Preferably, the conveying speed of each layer of the chain drive mechanism is independently adjustable, and the transmission device is a sprocket set driven by a geared motor.

[0015] Preferably, the control system is configured to automatically reduce the fuel supply to the hot blast stove when either the first temperature sensor group or the second temperature sensor group detects a temperature ≥250°C.

[0016] Preferably, the sieve is equipped with a 25mm aperture screen, the upper channel of the screen is connected to the feed inlet of the drying box, and the lower part of the screen is equipped with a coke powder collection funnel.

[0017] Preferably, the hot blast stove uses coke oven gas as fuel, and the combustion chamber of the hot blast stove is connected to the drying box through a high-temperature resistant pipe.

[0018] Preferably, the control system is a PLC controller that integrates a temperature display module, an induced draft fan frequency converter module, and a hot air furnace gas regulating valve control module.

[0019] Preferably, the drying box has a heat insulation layer on its side wall, and the hot exhaust gas inside the drying box flows in a counter-current manner to the coke conveying direction.

[0020] Its beneficial effects are as follows:

[0021] This waste heat utilization coke dehydration device recovers the waste heat generated by the combustion of coke oven gas through a hot blast stove. The moisture content of the coke is reduced through a closed-loop temperature control system and a multi-layer counter-current drying box. On the one hand, it solves the adverse effects of high coke moisture on blast furnace production; on the other hand, it creates economic benefits for enterprises, as the price of dried and dehydrated coke is higher than that of coke produced by conventional wet quenching. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] In the diagram: 1. Drying oven; 11. Chain drive mechanism; 2. Hot air furnace; 3. Exhaust fan; 4. Temperature monitoring unit; 41. First temperature sensor group; 42. Second temperature sensor group; 5. Screen; 6. Conveyor belt; 7. Control system. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0027] This utility model discloses a coke dehydration device that utilizes waste heat, according to the attached... Figure 1 As shown, it includes a drying box 1, a hot air furnace 2, an induced draft fan 3, a temperature monitoring unit 4, a sieve 5, a conveyor belt 6, and a control system 7;

[0028] According to the appendix Figure 1 As shown, the drying chamber 1 further includes five parallel chain drive mechanisms 11 inside. Each chain layer is sequentially connected by a sprocket set driven by a reduction motor. Coke is conveyed layer by layer from the top chain to the bottom chain for output. The conveying speed of each chain drive mechanism 11 can be independently adjusted to meet the dehydration requirements of coke with different particle sizes. The side walls of the drying chamber 1 are equipped with a heat insulation layer, and the flow direction of the hot exhaust gas inside the chamber is arranged counter-currently to the coke conveying direction, thereby enhancing heat exchange efficiency.

[0029] According to the appendix Figure 1 As shown, the hot blast stove 2 uses coke oven gas as fuel, and its combustion chamber is connected to the air inlet of the drying box 1 through a high-temperature resistant pipe. The hot exhaust gas generated by combustion is transported to the drying box 1 through the pipe.

[0030] According to the appendix Figure 1 As shown, furthermore, the induced draft fan 3 is installed on the pipe between the hot air furnace 2 and the drying box 1, and the hot exhaust gas is forcibly introduced into the drying box 1 through the suction action to ensure that the hot exhaust gas is evenly distributed.

[0031] According to the appendix Figure 1As shown, the temperature monitoring unit 4 further includes a first temperature sensor group 41 located at the outlet pipe of the hot air furnace 2 and a second temperature sensor group 42 located at the exhaust outlet of the drying box 1. Both the first temperature sensor group 41 and the second temperature sensor group 42 consist of two sets of sensors. Both sets of sensors adopt a dual-point redundancy design to improve reliability. The detection data is transmitted to the control room display instrument in real time.

[0032] According to the appendix Figure 1 As shown, further, the sieve 5 is installed at the feed end of the drying box 1, and is equipped with a 25mm aperture screen. The channel above the screen is connected to the feed port of the drying box 1, and a coke powder collection funnel is provided below the screen to separate coke with a particle size ≥25mm into the drying box 1, while coke powder with a particle size <25mm is discharged through the funnel.

[0033] According to the appendix Figure 1 As shown, the conveyor belt 6 is further connected to the discharge port of the drying box 1, which transports the dehydrated coke to the coke yard for loading and sale.

[0034] According to the appendix Figure 1 As shown, the control system 7 further employs a PLC controller, integrating a temperature display module, an induced draft fan frequency converter module, and a hot air furnace gas regulating valve control module, which are respectively connected to the temperature monitoring unit 4, the hot air furnace 2, and the induced draft fan 3. When any of the temperature detected by the first temperature sensor group 41 or the second temperature sensor group 42 is ≥250℃, the PLC controller automatically reduces the fuel supply to the hot air furnace 2 and adjusts the airflow through the induced draft fan frequency converter module to ensure that the temperature of the hot exhaust gas is always within a safe range.

[0035] The working principle of this waste heat utilization coke dehydration device is as follows:

[0036] Hot blast stove 2 burns coke oven gas to generate hot waste gas. The induced draft fan 3 draws the hot waste gas into drying box 1. The qualified coke after being screened by sieve 5 enters the top chain of drying box 1. During the multi-layer chain transmission process, it fully contacts the counter-current hot waste gas to achieve dehydration. The dehydrated coke is output from the bottom chain to the conveyor belt 6. The temperature monitoring unit 4 feeds back the temperature data to the control system 7 in real time. The process stability is maintained by dynamically adjusting the fuel supply of hot blast stove 2 and the air volume of induced draft fan 3.

[0037] The operating steps of this waste heat utilization coke dehydration device are as follows:

[0038] Start the hot air furnace 2 to preheat to the set temperature;

[0039] Turn on the induced draft fan 3 to establish hot waste gas circulation;

[0040] The material is continuously fed into the drying box 1 through the sluice screen 5;

[0041] The control system 7 automatically adjusts the process parameters based on the feedback data from the temperature monitoring unit 4;

[0042] After dehydration, the coke is output via conveyor belt 6.

[0043] The beneficial effects of this waste heat utilization coke dehydration device are as follows:

[0044] By utilizing waste heat from hot exhaust gases, the moisture content of coke is reduced from 13% to below 5%, significantly improving the calorific value and mechanical strength of the coke to meet the production requirements of blast furnaces. The counter-current drying and multi-layer chain drive design improve heat exchange efficiency, and the PLC automated control system ensures safe and stable operation of the process. This device increases the selling price of dried coke by approximately 200 yuan / ton, while reducing the burden of wastewater treatment, meeting the requirements of green and low-carbon production, and has significant economic and environmental benefits.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A coke dehydration device utilizing waste heat, characterized in that: include: The drying box (1) is provided with at least two layers of chain drive mechanism (11) inside, which is used to transport coke; A hot air furnace (2) is connected to the air inlet of the drying box (1) via a pipe. The hot air furnace (2) is used to supply hot exhaust gas to the drying box (1). An induced draft fan (3) is installed on the pipe between the hot air furnace (2) and the drying box (1). The induced draft fan (3) is used to draw hot waste gas into the drying box (1). The temperature monitoring unit (4) includes a first temperature sensor group (41) located at the outlet pipe of the hot air furnace (2) and a second temperature sensor group (42) located at the exhaust outlet of the drying box (1); A sieve (5) is installed at the feed end of the drying box (1) and is used to screen the coke particle size. The conveyor belt (6) is connected to the discharge port of the drying box (1); The control system (7) is connected to the temperature monitoring unit (4), the hot air furnace (2) and the induced draft fan (3) respectively. The control system (7) is used to adjust the temperature of the hot exhaust gas.

2. The coke dehydration device for waste heat utilization according to claim 1, characterized in that, The chain drive mechanism (11) consists of five parallel chain layers, with each layer of chain connected sequentially by a transmission device. Coke is transmitted from the top chain to the bottom chain for output.

3. A coke dehydration device for waste heat utilization according to claim 2, characterized in that, The conveying speed of each chain drive mechanism (11) is independently adjustable, and the transmission device is a sprocket set driven by a geared motor.

4. The coke dehydration device for waste heat utilization according to claim 1, characterized in that, The control system (7) is configured to automatically reduce the fuel supply of the hot air furnace (2) when either the first temperature sensor group (41) or the second temperature sensor group (42) detects a temperature ≥250°C.

5. A coke dehydration device for waste heat utilization according to claim 1, characterized in that, The sieve (5) is equipped with a 25mm aperture screen, the upper channel of which is connected to the feed inlet of the drying box (1), and the lower part of the screen is equipped with a coke powder collection funnel.

6. A coke dehydration device for waste heat utilization according to claim 1, characterized in that, The hot blast stove (2) uses coke oven gas as fuel, and the combustion chamber of the hot blast stove (2) is connected to the drying box (1) through a high-temperature resistant pipe.

7. A coke dehydration device for waste heat utilization according to claim 1, characterized in that, The control system (7) is a PLC controller that integrates a temperature display module, an induced draft fan frequency converter module, and a hot air furnace gas regulating valve control module.

8. A coke dehydration device for waste heat utilization according to claim 1, characterized in that, The drying box (1) has a heat insulation layer on its side wall, and the hot exhaust gas inside the drying box (1) flows in a counter-current manner to the coke conveying direction.

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