A recycling system for generating power by recovering waste heat from calcined coke

Abstract

The utility model discloses a kind of calcined coke waste heat recovery power generation's recycling system, belong to industrial waste heat recovery technical field.The system includes closed loop circulation module, heat exchange module and power generation module.Heat exchange module adopts water jacket heat exchanger with spiral guide vane, and the waste heat of high-temperature calcined coke is recycled efficiently, and circulating softened water is heated.Power generation module adopts magnetic suspension ORE generator set, and high-temperature softened water is used to generate electricity.After power generation, softened water is cooled and returned, and forms closed loop circulation.The utility model realizes the efficient recovery of waste heat in calcined coke production process and electric energy conversion, has the advantages of high energy utilization, zero wastewater discharge, stable operation, good economic benefit etc., solves the problem of serious energy waste of traditional cooling mode.

Description

Technical Field

[0001] This utility model belongs to the field of industrial waste heat recovery and energy utilization technology, specifically relating to a recycling system for power generation from waste heat recovered from calcined coke. Background Technology

[0002] Calcined coke is the product of petroleum coke after high-temperature calcination and is an important raw material for industries such as electrolytic aluminum and graphite electrodes. After calcination, the temperature of the calcined coke is usually above 200℃, and it must be cooled before it can be stored, crushed, or processed.

[0003] Currently, the industry primarily uses natural air-drying or simple water-spraying cooling to cool calcined coke. These traditional methods have significant drawbacks: First, a large amount of medium- and high-quality waste heat is directly lost into the atmosphere during the cooling process, resulting in serious energy waste; second, waste heat emissions lead to increased ambient temperatures in the production area, increasing the pressure on environmental governance; finally, water cooling consumes a large amount of water resources and may generate wastewater, while forced air cooling and other methods require additional electricity. All of these factors increase production and operating costs, contradicting the national industrial development policy of "energy conservation, carbon reduction, and resource recycling."

[0004] Magnetic levitation ORE (Organic Rankine Cycle) power generation technology, as a highly efficient medium- and low-temperature waste heat power generation technology, has advantages such as low mechanical loss, high power generation efficiency, and stable operation, making it very suitable for generating electricity using waste heat carried by media such as hot water. However, there is currently no mature technical solution to organically combine the magnetic levitation ORE power generation system with the continuous cooling process of calcined coke to construct an efficient, closed-loop waste heat recovery power generation cycle. Therefore, there is an urgent need to develop a waste heat recycling system specifically adapted to the calcined coke production scenario to solve the problems of energy waste, high cost, and environmental thermal pollution in existing technologies. Utility Model Content

[0005] To address the problems existing in current technologies, this utility model aims to overcome the shortcomings of existing post-calcined coke cooling technologies, such as severe waste of waste heat, low energy utilization, and high operating costs, and provides a recycling system for post-calcined coke waste heat recovery and power generation. This system constructs a closed-loop chain of "post-calcined coke heat exchange - waste heat power generation - hot water circulation" to achieve full recovery of waste heat resources and cascade utilization of energy, thereby achieving energy conservation, reduced consumption, lower production costs, and reduced carbon emissions.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A recycling system for power generation from waste heat recovery of calcined coke includes: A closed-loop circulation module, in which softened water circulates internally, and is used to maintain the closed-loop circulation of the softened water. A heat exchange module, connected to the closed-loop circulation module, is used to absorb the residual heat of the calcined coke through indirect heat exchange and to heat the softened water. The power generation module, connected to the closed-loop circulation module, is used to generate electricity using the heat energy contained in the heated softened water, and to return the softened water to the closed-loop circulation module after cooling down. The closed-loop circulation module, heat exchange module, and power generation module are connected in sequence to form a closed-loop circuit that circulates softened water and recovers the waste heat from calcined coke to generate electricity.

[0007] Based on the above scheme, the closed-loop circulation module includes a circulation pump, an insulated pipe and a flow regulating valve. The circulation pump is used to provide power for the circulation of softened water, and the flow regulating valve is used to regulate the flow rate of the circulating water.

[0008] Based on the above scheme, the closed-loop circulation module also includes a temperature sensor installed on the insulated pipe for monitoring the water temperature at key nodes.

[0009] Based on the above scheme, the heat exchange module is a water-jacketed heat exchanger, which includes: The inner chamber is equipped with a flow guiding structure to guide the flow of calcined coke, forming a flow channel for calcined coke. The outer chamber is fitted outside the inner chamber, and its two ends are respectively provided with hot water inlet and hot water outlet, forming a circulating hot water channel connected to the closed-loop circulation module.

[0010] Based on the above scheme, the flow guiding structure in the inner cavity is a spiral flow guide plate.

[0011] Based on the above scheme, the water jacket heat exchanger is made of high-temperature resistant stainless steel.

[0012] Based on the above scheme, the power generation module is a magnetic levitation ORE generator set, which is equipped with a high-temperature water inlet and a low-temperature water outlet, used to receive softened water heated from the heat exchange module and to discharge softened water cooled after power generation.

[0013] Based on the above scheme, the configuration parameters of the system meet the following requirements: the heat exchange module can cool the calcined coke at a temperature of about 235°C to about 120°C for output, while simultaneously raising the temperature of the circulating softened water from about 85°C to about 100°C before it enters the power generation module.

[0014] Based on the above scheme, an auxiliary control module is also included. The auxiliary control module is electrically connected to the temperature sensor and flow regulating valve in the closed-loop circulation module and is used to dynamically adjust the circulating water flow based on water temperature information.

[0015] Based on the above scheme, the softened water is industrial softened water used to prevent scale buildup in pipes.

[0016] The beneficial effects of this utility model are: 1. This utility model precisely matches the cooling conditions of calcined coke (e.g., from 235℃ to 120℃), and recovers the originally lost waste heat into the circulating softened water through a high-efficiency heat exchange module, and drives a high-efficiency magnetic levitation ORE generator set to generate electricity, realizing "waste heat to electricity" and significantly reducing the dependence on externally purchased electricity in the production plant.

[0017] 2. The system uses softened water as the circulating working fluid, achieving a closed-loop cycle of "heating-power generation-cooling" in the circuit, with no wastewater discharge and high water resource utilization. At the same time, it fundamentally eliminates the direct emission of waste heat into the environment, reducing thermal pollution and carbon dioxide emissions, resulting in significant environmental benefits.

[0018] 3. The core power generation component of the system adopts a magnetic levitation ORE generator set, eliminating mechanical contact friction, ensuring reliable operation, low noise, and low maintenance costs. The water-jacketed heat exchanger has a robust structure, making it particularly suitable for continuous feeding conditions of high-temperature calcined coke, with stable heat exchange efficiency. The entire system is easy to integrate into existing calcined coke production lines, with low modification difficulty and a short investment payback period.

[0019] 4. Based on an hourly output of 11,520 kg of calcined coke, a single system can generate thousands of kWh of electricity per day, saving hundreds of thousands of yuan in electricity costs annually. At the same time, it saves energy and resources from the original cooling process, significantly improving the company's overall production efficiency. Attached Figure Description

[0020] The present invention includes the following figures: Figure 1 This is a system configuration block diagram of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in the embodiments of this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figure 1 As shown, the recycling system for power generation from waste heat of calcined coke described in this utility model mainly consists of a closed-loop circulation module, a heat exchange module, and a power generation module.

[0024] The closed-loop circulation module includes a circulation pump, a flow regulating valve, and a temperature sensor, all connected sequentially via insulated pipes. The module is filled with industrial softened water as the circulating medium. Softened water is used to prevent scaling on the pipes during long-term high-temperature circulation, which could affect heat exchange efficiency and system safety. The circulation pump provides power for the circulation of the softened water, while the flow regulating valve and temperature sensor monitor and regulate the circulation status to ensure stable system operation.

[0025] The heat exchange module employs a water-jacketed heat exchanger with a double-cavity structure. The inner layer is a flow chamber for calcined coke, equipped with spiral guide plates. After entering through the inlet, the high-temperature calcined coke spirals forward under the guidance of the guide plates, thus extending its residence time within the heat exchanger and increasing the contact area with the heat exchange wall, significantly improving heat exchange efficiency. The outer layer is a circulating hot water chamber where softened water flows. Heat is transferred from the high-temperature calcined coke in the inner layer to the circulating softened water in the outer layer through the high-temperature resistant stainless steel walls.

[0026] The power generation module employs a magnetic levitation ORE generator set. This unit utilizes advanced magnetic levitation bearing technology to eliminate mechanical friction, resulting in rapid start-up, high efficiency, and long service life. The unit's high-temperature water inlet is connected to the hot water outlet of the heat exchange module, while the low-temperature water outlet is connected to the circulation pump inlet via a pipeline.

[0027] The system's workflow is as follows: System Start-up and Circulation: Before starting the system, check the pipeline sealing and fill the closed-loop circuit with industrial softened water. Start the circulation pump to circulate the softened water in the circuit, and stabilize the initial water temperature at approximately 85°C using the auxiliary control module.

[0028] Post-calcination coke heat exchange: The post-calcination coke, with a temperature of approximately 235℃, is continuously fed into the inner chamber of a water-jacketed heat exchanger via a conveying device. The coke flows slowly under the action of a spiral guide plate, and its heat is transferred to the outer layer of circulating softened water through the heat exchanger wall. After heat exchange, the temperature of the post-calcination coke drops to approximately 120℃, and it is discharged from the outlet to proceed to subsequent processes.

[0029] Waste heat power generation: Circulating softened water that has absorbed waste heat has its temperature raised from approximately 85°C to approximately 100°C. It is then transported to the magnetic levitation ORE generator set through insulated pipes. The high-temperature hot water drives the working fluid inside the generator set to do work, converting thermal energy into electrical energy. The generated electricity can be directly connected to the plant's power grid.

[0030] Hot water recirculation and reuse: After releasing heat energy to perform work, the softened water, with its temperature dropping from approximately 100°C to approximately 85°C, flows out from the low-temperature water outlet of the generator set. This cooled softened water, driven by a circulating pump, flows back to the hot water inlet of the water-jacketed heat exchanger to begin the next heat exchange cycle, thus forming a continuous closed-loop operation process with almost zero water loss and no need for external high-temperature heat sources. The system only needs to periodically replenish the water lost due to the minimal amount of evaporation.

[0031] In one specific implementation case, the system has a processing capacity of 11,520 kg / h for calcined coke. Under this operating condition, the system can stably cool the calcined coke from 235℃ to 120℃ while simultaneously driving the generator set to run continuously. Calculations show that the system has high waste heat recovery power generation efficiency, stable operation, and can bring significant economic and environmental benefits to the enterprise.

[0032] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A recycling system for power generation from waste heat recovered from calcined coke, characterized in that, include: A closed-loop circulation module, in which softened water circulates internally, and is used to maintain the closed-loop circulation of the softened water. A heat exchange module, connected to the closed-loop circulation module, is used to absorb the residual heat of the calcined coke through indirect heat exchange and to heat the softened water. The power generation module, connected to the closed-loop circulation module, is used to generate electricity using the heat energy contained in the heated softened water, and to return the softened water to the closed-loop circulation module after cooling down. The closed-loop circulation module, heat exchange module, and power generation module are connected in sequence to form a closed-loop circuit that circulates softened water and recovers the waste heat from calcined coke to generate electricity.

2. The recycling system for power generation from waste heat recovery of calcined coke according to claim 1, characterized in that, The closed-loop circulation module includes a circulation pump, an insulated pipe, and a flow regulating valve. The circulation pump is used to provide power for the circulation of softened water, and the flow regulating valve is used to regulate the flow rate of the circulating water.

3. The recycling system for power generation from waste heat recovery of calcined coke according to claim 2, characterized in that, The closed-loop circulation module also includes a temperature sensor installed on the insulated pipe for monitoring the water temperature at key nodes.

4. The recycling system for power generation from waste heat recovery of calcined coke according to claim 1, characterized in that, The heat exchange module is a water-jacketed heat exchanger, which includes: The inner chamber is equipped with a flow guiding structure to guide the flow of calcined coke, forming a flow channel for calcined coke. The outer chamber is fitted outside the inner chamber, and its two ends are respectively provided with hot water inlet and hot water outlet, forming a circulating hot water channel connected to the closed-loop circulation module.

5. The recycling system for power generation from waste heat recovery of calcined coke according to claim 4, characterized in that, The flow guiding structure within the inner cavity is a spiral flow guide plate.

6. The recycling system for power generation from waste heat recovery of calcined coke according to claim 4 or 5, characterized in that, The water jacket heat exchanger is made of high-temperature resistant stainless steel.

7. The recycling system for power generation from waste heat recovery of calcined coke according to claim 1, characterized in that, The power generation module is a magnetic levitation ORE generator set, which is equipped with a high-temperature water inlet and a low-temperature water outlet, used to receive softened water heated from the heat exchange module and to discharge softened water cooled after power generation.

8. The recycling system for power generation from waste heat recovery of calcined coke according to claim 1, characterized in that, The system's configuration parameters satisfy the following: the heat exchange module cools the calcined coke at 235℃ to 120℃ for output, while simultaneously raising the temperature of the circulating softened water from 85℃ to 100℃ before it enters the power generation module.

9. The recycling system for power generation from waste heat recovery of calcined coke according to claim 1, characterized in that, It also includes an auxiliary control module, which is electrically connected to the temperature sensor and flow regulating valve in the closed-loop circulation module, and is used to dynamically adjust the circulating water flow based on water temperature information.

10. The recycling system for power generation from waste heat recovery of calcined coke according to claim 1, characterized in that, The softened water is industrial softened water used to prevent scale buildup in pipes.

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