High-temperature molten waste residue waste heat utilization system

Abstract

The invention relates to a high-temperature molten waste residue waste heat utilization system which comprises a fluidized bed provided with a feeding port, an air inlet and an air outlet for feeding waste residues; the heat storage part is connected to the air inlet and the air outlet; the boiler is respectively connected to the air inlet and the air outlet; and the airflow generating device can be used for driving the heat exchange gas to circularly flow between the fluidized bed and the heat storage part and can also be used for driving the heat exchange gas to circularly flow between the fluidized bed and the boiler. In the electricity trough period, the high-temperature gas can flow to the heat storage part for heat exchange, so that the heat is stored; in the peak period of electricity utilization, the high-temperature airflow can flow to the boiler to enable the boiler to work for power generation and the like, or part of the high-temperature airflow can flow to the heat storage part for heat storage, the other part of the high-temperature airflow can flow to the boiler for power generation, and therefore flexible utilization of the waste heat of the high-temperature molten waste residues can be achieved in the peak electricity period and the valley electricity period.

Description

Technical Field

[0001] This disclosure relates to the field of high-temperature waste residue waste heat utilization technology, specifically, to a high-temperature molten waste residue waste heat utilization system. Background Technology

[0002] In the production processes of steel and non-ferrous metal smelting, a large amount of high-temperature waste slag is generated, such as blast furnace slag and converter slag, which are molten waste slags with temperatures of 1400℃-1500℃. In actual production, the treatment of waste slag such as blast furnace slag commonly adopts the water quenching method, which uses a large amount of water to cool the high-temperature molten slag. This involves directly pouring the high-temperature molten slag into a slag pit, cooling it with water spray, and then crushing it. However, the water quenching method wastes a lot of water resources and causes the waste heat of the high-temperature waste slag. Moreover, some water seeps into the ground through the soil, causing serious groundwater pollution. Summary of the Invention

[0003] The purpose of this disclosure is to provide a high-temperature molten waste residue waste heat utilization system to at least partially solve the problems existing in related technologies.

[0004] To achieve the above objectives, this disclosure provides a high-temperature molten waste residue waste heat utilization system, comprising: A fluidized bed has a feed inlet for feeding the waste residue, an air inlet located near the bottom, and an air outlet located near the top. The heat storage unit is connected to the air inlet and the air outlet respectively; The boiler is connected to the air inlet and the air outlet, respectively; and The airflow generating device can be used to drive the heat exchange gas to circulate between the fluidized bed and the heat storage section, and can also be used to drive the heat exchange gas to circulate between the fluidized bed and the boiler.

[0005] Optionally, the airflow generating device can also be used to drive the heat exchange gas to circulate between the heat storage section and the boiler.

[0006] Optionally, any two of the fluidized bed, the heat storage unit, and the boiler may form a circulation path via pipelines to allow heat exchange gas to circulate between the respective two.

[0007] Optionally, the heat storage section is made of carbon-based solid heat storage material.

[0008] Optionally, the heat storage unit includes multiple heat storage devices connected in series.

[0009] Optionally, the airflow generating device can be used to drive the heat exchange gas to circulate between the fluidized bed and each of the heat storage devices, and the airflow generating device can be used to drive the heat exchange gas to circulate between the boiler and each of the heat storage devices.

[0010] Optionally, it also includes: The first pipeline connects the gas outlet of the fluidized bed to the boiler. The second pipeline connects the air inlet of the fluidized bed to the boiler. Multiple third pipelines are respectively connected between the corresponding heat storage device and the side wall of the first pipeline; Multiple fourth pipelines are each connected at one end to the corresponding heat storage device; The fifth pipeline, wherein the ends of the plurality of fourth pipelines furthest from the heat storage device are respectively connected to the sidewall of the second pipeline via the fifth pipeline; and The sixth conduit has one end connected to the side wall of the second conduit, and the other end connected to the plurality of fourth conduits respectively via the fifth conduit; and At least one seventh pipeline is connected between two adjacent thermal storage devices. The airflow generating device is located in the second pipeline between the fifth pipeline and the sixth pipeline.

[0011] Optionally, a first valve is provided on the side of the first pipeline located near the fluidized bed of the plurality of third pipelines; a second valve is provided on the side of the first pipeline located near the boiler of the plurality of third pipelines; each of the plurality of third pipelines is provided with a third valve; each of the plurality of fourth pipelines is provided with a fourth valve; a fifth valve is provided on the side of the fifth pipeline located near the second pipeline of the sixth pipeline; a sixth valve is provided on the sixth pipeline; a seventh valve is provided on the side of the second pipeline located away from the airflow generating device of the sixth pipeline; an eighth valve is provided on the side of the second pipeline located away from the airflow generating device of the fifth pipeline; and a ninth valve is provided on the seventh pipeline.

[0012] Optionally, it also includes a particle separator disposed at the air outlet of the fluidized bed, and a return inclined pipe is disposed between the bottom end of the particle separator and the fluidized bed.

[0013] Optionally, the heat exchange gas is an inert gas.

[0014] The above technical solution allows high-temperature molten waste residue to be fed into a fluidized bed through the feed inlet. The airflow generator can drive low-temperature heat exchange gas to enter the fluidized bed from the air inlet at the bottom of the fluidized bed to exchange heat with the high-temperature molten waste residue. The heated high-temperature heat exchange gas can then flow out through the air outlet. During periods of low electricity demand or when there is a significant influx of new energy sources, the high-temperature gas can be directed to the heat storage section for heat exchange and storage. The low-temperature gas obtained after heat exchange can then flow back into the fluidized bed through the bottom inlet to exchange heat with the high-temperature waste residue, creating a continuous cycle. During peak electricity demand, the high-temperature gas can be directed to the boiler to generate electricity. The low-temperature gas obtained from heat exchange in the boiler can then flow back into the fluidized bed through the bottom inlet to exchange heat with the high-temperature molten waste residue, creating a continuous cycle. Alternatively, during peak electricity demand, part of the high-temperature gas can be directed to boiler 3 for power generation, while the other part can flow to the heat storage section 2 for heat storage. The low-temperature gas obtained after passing through boiler 3 and heat storage section 2 flows back to the fluidized bed 1 for heat extraction, creating a continuous cycle. This waste heat utilization system offers high flexibility and multiple options. Furthermore, this disclosure utilizes a fluidized bed heat exchanger. Molten waste slag at 1400℃-1500℃ enters the fluidized bed through the feed inlet, and low-temperature heat exchange gas is blown in through the bottom of the fluidized bed. The heat exchange gas and the molten waste slag are fully fluidized and mixed in the fluidized bed. Due to the intense and thorough heat exchange during the fluidization and mixing process, the temperature of the heat exchange gas after exchanging heat with the molten waste slag can be raised to 1000℃-1100℃. During the fluidization process, the molten waste slag is cooled and separated into particles by the fluidizing gas, and can be discharged through the slag discharge port at the bottom of the fluidized bed for easy recycling.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a high-temperature molten waste residue waste heat utilization system exemplarily shown in this disclosure.

[0017] Explanation of reference numerals in the attached figures 1-Fluidized bed; 2-Heat storage section; 21-Heat storage device; 3-Boiler; 4-Airflow generator; 51-First pipeline; 52-Second pipeline; 53-Third pipeline; 54-Fourth pipeline; 55-Fifth pipeline; 56-Sixth pipeline; 57-Seventh pipeline; 61-First valve; 62-Second valve; 63-Third valve; 64-Fourth valve; 65-Fifth valve; 66-Sixth valve; 67-Seventh valve; 68-Eighth valve; 69-Ninth valve; 7-Particle separator; 71-Return inclined pipe. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, unless otherwise stated, the terms "top" and "bottom" are defined based on the actual orientation of the relevant components, such as a fluidized bed having a feed inlet for feeding waste residue, an air inlet located near the "bottom" and an air outlet located near the "top". Here, "top" and "bottom" are defined based on the orientation of the fluidized bed during use, with "top" referring to the position away from the ground and "bottom" referring to the position near the ground.

[0020] In addition, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0021] To facilitate understanding of the technical effects of this disclosure, a brief introduction to the fluidized bed 1 is provided here. The fluidized bed 1 is a device used in industrial processes, particularly in chemical reactions, material handling, and energy conversion. The fluidized bed 1 is a device that mixes solid particles with gas and "fluidizes" the solid particles under the action of an airflow. The fluidized bed 1 typically includes: a reactor containing the solid particles and gas, and a gas distribution plate located at the bottom of the reactor to uniformly distribute the gas flow rate and achieve stable fluidization. During operation, gas enters the bottom of the reactor through the gas distribution plate. When the gas flow rate reaches a certain value, it pushes the solid particles up, suspending them in the airflow, forming a fluidized bed. In this process, the solid particles flow like a liquid within the reactor. The solid particles in the fluidized bed 1 can react with the gas or exchange heat. The reacted gas can be discharged through the top of the reactor, while the solid particles return to the bottom of the fluidized bed 1 and are discharged. In the reactor, solid particles and gas can be mixed uniformly, reducing temperature gradients and the formation of local hot spots, thus improving overall heat exchange efficiency. The large surface area of ​​the solid particles allows heat to be rapidly transferred to the gas, and the gas flow rate can be controlled within a certain range, stabilizing the fluidization state and ensuring optimal heat exchange conditions. Since the structure and working principle of fluidized bed 1 are well known to those skilled in the art, they will not be described in detail here.

[0022] Reference Figure 1This disclosure exemplarily illustrates a high-temperature molten waste residue waste heat utilization system, including a fluidized bed 1 with a feed inlet for feeding waste residue, an air inlet located near the bottom, and an air outlet located near the top; a heat storage unit 2 connected to the air inlet and the air outlet respectively; a boiler 3 connected to the air inlet and the air outlet respectively; and a gas flow generating device 4. The gas flow generating device 4 can be used to drive the heat exchange gas to circulate between the fluidized bed 1 and the heat storage unit 2, and can also be used to drive the heat exchange gas to circulate between the fluidized bed 1 and the boiler 3. It should be explained that "circulation" here means that after the heat exchange gas has exchanged heat with the high-temperature molten waste residue in the fluidized bed 1, it flows to the heat storage unit 2 or the boiler 3 to release heat, and after releasing heat, it flows back to the fluidized bed 1 to exchange heat with the high-temperature molten waste residue for a new round of heat exchange. The heat storage unit 2 and the boiler 3 are also provided with air inlets and air outlets, so that the heat exchange gas can flow in through the air inlet for heat exchange and flow out through the air outlet.

[0023] This disclosure does not limit the specific temperature of "high-temperature molten waste residue". It refers to all waste residues that are at a high temperature and in a molten state, such as blast furnace slag, converter slag, etc., which are molten at a temperature of 1400℃-1500℃.

[0024] It should be clarified that the term "heat exchange gas" as used in this disclosure refers to a gaseous medium capable of heat exchange. There is no absolute correlation between the "heat exchange gas" mentioned earlier or later; that is, the "heat exchange gas" mentioned in this disclosure does not specifically refer to a particular part of gas in a pipeline or system. It only indicates that the system can have the function of allowing the "heat exchange gas" to circulate along a certain path. The source of the "heat exchange gas" and whether the "heat exchange gas" used in different operating states is the same part of gas that is reused (i.e., the gas participates in the circulation under different operating conditions) are not limited. In some embodiments, when the airflow generating device 4 simultaneously drives the heat exchange gas to circulate between the fluidized bed 1 and the boiler 3, and between the fluidized bed 1 and the heat storage section 2, the "heat exchange gas" in the two circulation paths can be shared. That is, after the heat exchange gas extracts heat from the fluidized bed 1, it can be divided into two branches flowing to the heat storage section 2 and the boiler 3 respectively, and the heat exchange gas flowing out of the heat storage section 2 and the boiler 3 can return to the fluidized bed 1 through a main path. Furthermore, in some other embodiments, the "heat exchange gas" in the two circulation paths can also be independent of each other. The heat exchange gas used by the airflow generating device 4 when driving the heat exchange gas to circulate between the fluidized bed 1 and the heat storage section 2, and when driving the heat exchange gas to circulate between the fluidized bed 1 and the boiler 3, can be the same part of the heat exchange gas reused, or it can be the heat exchange gas corresponding to each (not the same part of the gas reused in two working states).

[0025] The heat storage unit 2 and the boiler 3 can be connected to the air outlet and air inlet of the fluidized bed 1 respectively via pipelines. When the fluidized bed 1 has one air inlet and one air outlet, one of the heat storage unit 2 and the boiler 3 can be directly connected to the air inlet and air outlet via pipelines, while the other can be connected to the pipeline to indirectly connect to the air inlet and air outlet. Alternatively, the fluidized bed 1 can also have main pipelines at the air inlet and air outlet respectively, and then be connected to the heat storage unit 2 and the boiler 3 respectively via branch pipelines. This disclosure does not limit the specific connection path between the heat storage unit 2, the boiler 3, and the fluidized bed 1, as long as the heat exchange gas can be selectively circulated between the fluidized bed 1 and the heat storage unit 2, or between the fluidized bed 1 and the boiler 3, or simultaneously circulated between the fluidized bed 1 and the heat storage unit 2 and the boiler 3, as appropriate. The specific connection path will be described below.

[0026] In the embodiments of this disclosure, boiler 3 can be a waste heat boiler.

[0027] Based on the characteristics of the aforementioned fluidized bed 1, this disclosure overcomes prejudice by placing high-temperature molten waste residue in the fluidized bed 1 and continuously moving it through the action of airflow (heat exchange gas), thereby increasing the contact area between the waste residue and the heat exchange gas and improving the heat transfer efficiency. As the waste residue gradually cools and turns into solid particles, the aforementioned fluidization phenomenon can continue to be achieved, so that the heat exchange gas can fully extract heat in the fluidized bed 1 to obtain high-temperature (1000℃-1100℃) heat exchange gas.

[0028] By using the above technical solution, high-temperature molten waste residue is fed into fluidized bed 1 through the feed inlet. The airflow generator 4 can drive low-temperature heat exchange gas to enter fluidized bed 1 from the air inlet at the bottom of fluidized bed 1 to exchange heat with the high-temperature molten waste residue. The heated high-temperature heat exchange gas can flow out through the air outlet. During periods of low electricity demand or when there is a significant influx of renewable energy, the high-temperature gas can be directed to the heat storage section 2 for heat exchange and storage. The low-temperature gas obtained after heat exchange can then flow back into the fluidized bed 1 through the bottom inlet to exchange heat with the high-temperature molten waste residue, creating a continuous cycle. During peak electricity demand, the high-temperature gas can be directed to the boiler 3 to generate electricity. The low-temperature gas obtained in the boiler 3 can then flow back into the fluidized bed 1 through the bottom inlet to exchange heat with the high-temperature molten waste residue, creating a continuous cycle. Alternatively, during peak electricity demand, part of the high-temperature gas can be directed to the boiler 3 for power generation, while the other part flows to the heat storage section 2 for heat storage. The low-temperature gas obtained after passing through the boiler 3 and the heat storage section 2 flows back to the fluidized bed 1 for heat extraction, creating a continuous cycle. This waste heat utilization system offers high flexibility and multiple options. In addition to the heat storage section, this disclosure uses a fluidized bed 1 for heat exchange. Molten waste slag at 1400℃-1500℃ enters the fluidized bed 1 through the feed inlet. Low-temperature heat exchange gas is blown in through the bottom of the fluidized bed 1. The heat exchange gas and the molten waste slag are fully fluidized and mixed in the fluidized bed 1. Due to the intense and thorough heat exchange during the fluidization and mixing process, the temperature of the heat exchange gas after exchanging heat with the molten waste slag can be raised to 1000℃-1100℃. The molten waste slag is cooled and separated into particles by the fluidizing gas during the fluidization process and can be discharged through the slag discharge port at the bottom of the fluidized bed 1 for easy recycling.

[0029] Reference Figure 1In the embodiments of this disclosure, the airflow generating device 4 can also be used to drive the heat exchange gas to circulate between the heat storage section 2 and the boiler 3. As described above, during peak electricity consumption periods, the airflow generating device 4 can drive the heat exchange gas to circulate between the fluidized bed 1 and the boiler 3 to transfer the residual heat of the high-temperature molten waste residue in the fluidized bed 1 to the boiler 3 for boiler 3 operation. With this design, when the high-temperature waste residue needs to be discharged after being cooled to a lower temperature and new high-temperature molten waste residue needs to be added back to the fluidized bed 1, the airflow generating device 4 can drive the heat exchange gas to circulate between the heat storage section 2 and the boiler 3. That is, the low-temperature heat exchange gas can flow through the heat storage section 2 and absorb heat to obtain high-temperature heat exchange gas. The high-temperature heat exchange gas flows through the boiler 3 and releases heat to heat the boiler 3. After releasing heat, the heat exchange gas flows back to the heat storage section 2 to absorb heat again. This process is repeated to ensure that during the intervals when replacing the high-temperature molten waste residue, the boiler 3 can still maintain its operating state for peak shaving using the heat in the heat storage section 2. Furthermore, during peak electricity consumption periods, when the heat exchange gas circulates between the fluidized bed 1 and the boiler 3 to generate electricity, a portion of the low-temperature heat exchange gas after heat exchange in the boiler 3 can also enter the heat storage section 2 for heat extraction. The obtained high-temperature heat exchange gas flows back to the boiler 3, while the other portion circulates back to the fluidized bed 1 for heat extraction. Through the cooperation of the heat storage section 2 and the fluidized bed 1, the output of the boiler 3 is maximized. This allows for the utilization of the waste heat from the high-temperature molten waste residue during both peak and off-peak electricity periods, while maximizing the adjustment of the peak and off-peak electricity usage ratio. It should also be noted that when the airflow generating device 4 simultaneously drives the heat exchange gas to circulate between the fluidized bed 1 and the boiler 3, and between the boiler 3 and the heat storage section 2, the "heat exchange gas" in the two circulation paths can be shared. That is, after heat exchange in the boiler 3, the heat exchange gas can be divided into two branches flowing to the heat storage section 2 and the fluidized bed 1 respectively. Moreover, the heat exchange gas that has extracted heat in the fluidized bed 1 and the heat storage section 2 can be mixed and flow back to the boiler 3 through a main path. Furthermore, in some other embodiments, the "heat exchange gas" in the two circulation paths may also be independent of each other, which is not a limitation of this disclosure.

[0030] In summary, the waste heat utilization system provided in this disclosure can flexibly control the circulation of heat exchange gas between the fluidized bed 1, the heat storage section 2, and the boiler 3 according to actual electricity demand, thereby reasonably adjusting to meet different demands during off-peak and peak electricity periods. It is highly flexible and offers a wide range of options.

[0031] In order to achieve “circulation flow” between any two of the aforementioned fluidized bed 1, heat storage section 2 and boiler 3, in the embodiments of this disclosure, any two of the fluidized bed 1, heat storage section 2 and boiler 3 can form a circulation path through pipelines to allow heat exchange gas to circulate between the respective two.

[0032] This disclosure does not limit the specific composition of the heat storage section 2. For example, in the embodiments of this disclosure, the heat storage section 2 can be made of carbon-based solid heat storage material. Carbon-based solid heat storage material has the characteristics of high thermal conductivity, high temperature resistance, and a wide operating temperature range. Its heat storage medium temperature can reach 900-1000℃. By using this material in conjunction with the aforementioned fluidized bed 1 for heat exchange, the waste heat of the high-temperature molten waste residue can be stored and utilized to the maximum extent, thereby improving the quality of heat storage. Furthermore, the high-temperature molten waste residue waste heat utilization system can be periodically adjusted through the valves and pipelines mentioned below, enabling continuous operation of the system.

[0033] Reference Figure 1 In the embodiments of this disclosure, the heat storage unit 2 may include multiple heat storage devices 21 connected in series, specifically two, three, etc., and each heat storage device 21 may be made of carbon-based solid heat storage material. With this design, when the heat storage unit 2 is storing heat, the operator can control the high-temperature heat exchange gas to sequentially enter multiple heat storage devices 21, so that heat is released step-by-step in each heat storage device 21, effectively ensuring the efficient utilization of the recovered high-temperature waste heat. Similarly, during heat release, heat release can also be performed in series according to the temperature inside the heat storage devices 21, that is, controlling the low-temperature heat exchange gas to sequentially pass through each heat storage device 21. Specifically, since the temperature of the heat storage device 21 decreases during the heat release process, when the temperature is lower than the requirements of the waste heat boiler, there is still some usable heat inside. This series heat release can be used to gradually increase the temperature of the low-temperature heat exchange gas to meet the requirements of the boiler 3. In summary, through this design, the heat storage and heat release capacity of the heat storage unit 2 can be improved, thereby improving the waste heat utilization efficiency of the waste heat utilization system.

[0034] Reference Figure 1In the embodiments of this disclosure, the airflow generator 4 can be used to drive the heat exchange gas to circulate between the fluidized bed 1 and each heat storage device 21, and the airflow generator 4 can also be used to drive the heat exchange gas to circulate between the boiler 3 and each heat storage device 21. With this design, in addition to the aforementioned staged heat release and heat storage, the operator can also control the high-temperature airflow to be diverted and enter its respective corresponding heat storage device 21, so that multiple heat storage devices 21 can simultaneously perform heat storage (with similar heat storage temperatures). Furthermore, the operator can also control only some of the multiple heat storage devices 21 to perform heat storage work according to the actual situation. Specifically, this can be adjusted according to the temperature of the heat storage material in each heat storage device 21. When the temperature of the heat storage material reaches a set value, the heat storage device 21 in which it is located has completed heat storage, and its relevant valves can be closed to prevent it from participating in heat storage work. Similarly, the heat storage devices 21 can also be controlled to release heat in parallel (i.e., release heat individually). Alternatively, some of the heat storage devices 21 can be controlled to release and store heat independently, while the other heat storage devices 21 release and store heat in stages. This disclosure does not limit the specific working mode, and it can be adjusted in real time according to the needs of the site. This design increases the utilization space of the heat storage device 21 and the flexibility of control, and improves the selectivity of the waste heat system so as to meet more usage needs.

[0035] As stated above, this disclosure does not limit how the aforementioned various "circulating flows" are implemented or how the switching of the aforementioned various "circulating flows" is implemented. The piping system can be adaptively arranged according to actual conditions, for example, in... Figure 1In the illustrated embodiment, the high-temperature molten waste heat utilization system may further include: a first pipeline 51 connected between the outlet of the fluidized bed 1 and the boiler 3; a second pipeline 52 connected between the inlet of the fluidized bed 1 and the boiler 3; a plurality of third pipelines 53 respectively connected between the corresponding heat storage device 21 and the side wall of the first pipeline 51; a plurality of fourth pipelines 54 each connected at one end to the corresponding heat storage device 21; a fifth pipeline 55, the ends of the plurality of fourth pipelines 54 away from the heat storage device 21 respectively connected to the side wall of the second pipeline 52 through the fifth pipeline 55; a sixth pipeline 56, one end connected to the side wall of the second pipeline 52, and the other end connected to the plurality of fourth pipelines 54 respectively through the fifth pipeline 55; and at least one seventh pipeline 57 respectively connected between two adjacent heat storage devices 21. The airflow generating device 4 is disposed on the second pipeline 52 at a position between the fifth pipeline 55 and the sixth pipeline 56. Here, it needs to be explained that "the position between the fifth pipe 55 and the sixth pipe 56" refers to the two connection points between the second pipe 52 and the fifth pipe 55 and the sixth pipe 56. With this design, by controlling the on / off state of each pipe (e.g., through valves mentioned below), various circulation flows of the aforementioned heat exchange gas can be achieved, thereby enabling flexible utilization of the waste heat.

[0036] In addition to the above embodiments, in some other embodiments, the side wall of the second pipeline 52 can be connected to one of the heat storage devices 21 through a main pipeline, and the other heat storage devices 21 can be connected to the side wall of the main pipeline through branch pipelines. This disclosure does not limit the specific arrangement of the pipeline, as long as it can perform the above functions.

[0037] In the embodiments of this disclosure, the airflow generating device 4 can be a circulating fan. Furthermore, in some other embodiments, the airflow generating device 4 can also be an air pump.

[0038] Furthermore, in order to control the on / off state of each pipeline to meet the system's switching needs between various operating conditions, refer to Figure 1In the embodiments disclosed herein, a first valve 61 may be provided at the position of the first pipeline 51 located on the side of the plurality of third pipelines 53 near the fluidized bed 1. Here, "the position of the first pipeline 51 located on the side of the third pipeline 53 near the fluidized bed 1" refers to the side of the connection position of the first pipeline 51 and the third pipeline 53 near the fluidized bed 1, and the same applies below. A second valve 62 can be installed on the first pipeline 51 at the side of the multiple third pipelines 53 near the boiler 3. Each of the multiple third pipelines 53 can be equipped with a third valve 63. Each of the multiple fourth pipelines 54 can be equipped with a fourth valve 64. A fifth valve 65 can be installed on the fifth pipeline 55 at the side of the sixth pipeline 56 near the second pipeline 52. A sixth valve 66 can be installed on the sixth pipeline 56. A seventh valve 67 can be installed on the side of the second pipeline 52 away from the airflow generating device 4. An eighth valve 68 can be installed on the side of the second pipeline 52 away from the airflow generating device 4. A ninth valve 69 can be installed on the seventh pipeline 57.

[0039] This disclosure does not limit the type of valves mentioned above; they can be manual valves, solenoid valves, etc. Furthermore, the power generation efficiency of boiler 3 can be adjusted by regulating the valve opening. In addition, in some other embodiments, the third valve 63 can be omitted, and a fourth valve and a fifth valve can be respectively installed on the fourth pipeline 54 and the fifth pipeline 55. This disclosure does not limit the arrangement of the valves.

[0040] To facilitate understanding of this solution, the following is combined with... Figure 1 The embodiments describe its working process in detail. Of course, Figure 1 This is merely one exemplary embodiment, and the disclosure is not limited thereto. Specifically: During off-peak electricity periods, valves 62, 65, and 67 are closed, while other valves are opened. The airflow generator 4 is activated, blowing low-temperature heat exchange gas into the fluidized bed 1 from the bottom through a portion of the second pipeline 52. The high-temperature heat exchange gas, after heat exchange, flows through the outlet of the fluidized bed 1 and a portion of the first pipeline 51 and the third pipeline 53 to the heat storage section 2 for heat release and storage. Then, after flowing out of the heat storage section 2, it returns to the fluidized bed 1 via the fourth pipeline 54, a portion of the fifth pipeline 55, the sixth pipeline 56, and a portion of the second pipeline 52. During peak electricity periods, valves 63, 65, and 66 are closed, while other valves are opened. The airflow generator 4 is activated. The heat exchange gas in the fluidized bed 1 and the boiler 3 can circulate between the first pipe 51 and the second pipe 52 to utilize the waste heat from the high-temperature waste residue for boiler 3 operation. When waste residue needs to be replaced during peak power periods, the first valve 61, the eighth valve 68, and the sixth valve 66 are closed, while other valves are opened, and the airflow generator 4 is activated. The airflow generator 4 then drives the low-temperature heat exchange gas through the fifth pipe 55 and the fourth pipe 54 into the heat storage section 2 for heat absorption. After heat absorption, the high-temperature heat exchange gas can flow through the third pipe 53 and part of the first pipe 51 to the boiler 3 for heat release, supplying the boiler 3 for operation. The heat exchange gas released in the boiler 3 can then flow through part of the second pipe 52 and the fifth pipe... 55 and the fourth pipe 54 return to the heat storage section 2, and so on in a continuous cycle. Furthermore, during peak electricity demand, if the power generation requirement is high, in addition to the aforementioned circulation of the heat exchange gas between the fluidized bed 1 and the boiler 3, the sixth valve 66 can be closed and other valves opened. The airflow generator 4 can drive a portion of the heat exchange gas after it has released heat from the boiler 3 through a portion of the second pipe 52, the fifth pipe 55, and the fourth pipe 54 into the heat storage section 2 for heat extraction (the other portion of the heat exchange gas returns to the fluidized bed 1 for heat extraction), and then flow through the third pipe 53 and a portion of the first pipe 51 to the boiler 3 for heat release. This achieves the coordination between the fluidized bed 1 and the heat storage section 2 to maximize the output of the boiler 3, thus enabling power generation during peak and off-peak electricity periods. This system achieves the utilization of waste heat from high-temperature molten waste slag while maximizing the adjustment of peak and off-peak electricity usage ratios. Furthermore, under peak electricity conditions, if power generation demand is low, in addition to the aforementioned circulation of the heat exchange gas between fluidized bed 1 and boiler 3, the fifth valve 65 can be closed and other valves opened. The airflow generator 4 can also drive at least a portion of the high-temperature heat exchange gas after heat exchange in fluidized bed 1 through the third pipeline 53 into the heat storage section 2 for heat release and storage (the remaining portion of the high-temperature heat exchange gas flows to boiler 3). The heat exchange gas released in the heat storage section 2 then flows back to fluidized bed 1 via the fourth pipeline 54, part of the fifth pipeline 55, and the sixth pipeline 56, achieving the effect of simultaneous power generation and heat storage. Besides the switching of the aforementioned operating conditions, in... Figure 1In the illustrated embodiment, operators can also achieve a series connection (gradual heat release or storage) or a parallel connection (individual heat release or storage) between multiple heat storage devices 21 by controlling the switching combinations of multiple third valves 63, multiple ninth valves 69, and multiple fourth valves 64. For example, the aforementioned parallel connection effect can be achieved by opening all third valves 63 and all fourth valves 64 and closing all ninth valves 69; the aforementioned series connection effect can be achieved by opening the leftmost third valve 63 and closing the remaining third valves 63, opening all ninth valves 69, and opening the rightmost fourth valve 64 and closing the remaining fourth valves 64. To avoid redundancy, this disclosure does not describe other specific combinations.

[0041] Reference Figure 1 In the embodiments of this disclosure, the high-temperature molten waste heat utilization system may further include a particle separator 7 disposed at the outlet of the fluidized bed 1, and a return inclined pipe 71 may be disposed between the bottom end of the particle separator 7 and the fluidized bed 1. With this design, during the fluidized heat exchange process, the fine particles carried by the waste itself and generated during the airflow separation process can be separated by the particle separator 7 and returned to the fluidized bed 1 through the return inclined pipe 71, and then discharged together with the cooled waste through the slag discharge port at the bottom of the fluidized bed 1.

[0042] This disclosure does not limit the particle separator 7. For example, in the embodiments of this disclosure, it can be a cyclone separator, specifically a high-temperature cyclone separator. This design can directly utilize the flow of heat exchange gas to achieve separation, simplifying the separator structure.

[0043] This disclosure does not limit the type of heat exchange gas. For example, in the embodiments of this disclosure, the heat exchange gas can be an inert gas, such as nitrogen. An inert gas can avoid further oxidation reactions, thereby ensuring that the temperature of the heat exchange gas obtained after heat exchange with the waste residue is extremely high while safely cooling the high-temperature waste residue and without changing the utilization properties of the waste residue, thus improving the utilization rate of the waste heat.

[0044] As described above, in the embodiments of this disclosure, the fluidized bed 1 may be provided with a discharge port for slag removal. The discharge port design allows for the rapid discharge of cooled waste slag, facilitating the introduction of new high-temperature slag, making operation convenient and quick.

[0045] As described above, in the embodiments of this disclosure, the fluidized bed 1 may include a reactor for containing waste residue and a gas distribution plate disposed at the bottom of the reactor. The gas distribution plate is used to uniformly blow heat exchange gas into the reactor to generate fluidized heat exchange.

[0046] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0047] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0048] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A high-temperature molten waste residue waste heat utilization system, characterized in that, include: A fluidized bed has a feed inlet for feeding the waste residue, an air inlet located near the bottom, and an air outlet located near the top. The heat storage unit is connected to the air inlet and the air outlet respectively; The boiler is connected to the air inlet and the air outlet, respectively. as well as The airflow generating device can be used to drive the heat exchange gas to circulate between the fluidized bed and the heat storage section, and can also be used to drive the heat exchange gas to circulate between the fluidized bed and the boiler.

2. The high-temperature molten waste residue waste heat utilization system according to claim 1, characterized in that, The airflow generating device can also be used to drive the heat exchange gas to circulate between the heat storage section and the boiler.

3. The high-temperature molten waste residue waste heat utilization system according to claim 2, characterized in that, Any two of the fluidized bed, the heat storage unit, and the boiler are connected by a pipeline to form a circulation path, allowing the heat exchange gas to circulate between the respective two.

4. The high-temperature molten waste residue waste heat utilization system according to any one of claims 1-3, characterized in that, The heat storage section is made of carbon-based solid heat storage material.

5. The high-temperature molten waste residue waste heat utilization system according to claim 4, characterized in that, The heat storage section includes multiple heat storage devices connected in series.

6. The high-temperature molten waste residue waste heat utilization system according to claim 5, characterized in that, The airflow generating device can be used to drive the heat exchange gas to circulate between the fluidized bed and each of the heat storage devices, and the airflow generating device can be used to drive the heat exchange gas to circulate between the boiler and each of the heat storage devices.

7. The high-temperature molten waste residue waste heat utilization system according to claim 6, characterized in that, Also includes: The first pipeline connects the gas outlet of the fluidized bed to the boiler. The second pipeline connects the air inlet of the fluidized bed to the boiler. Multiple third pipelines are respectively connected between the corresponding heat storage device and the side wall of the first pipeline; Multiple fourth pipelines are each connected at one end to the corresponding heat storage device; The fifth pipeline, wherein the ends of the plurality of fourth pipelines furthest from the heat storage device are respectively connected to the side wall of the second pipeline through the fifth pipeline; as well as The sixth pipeline has one end connected to the side wall of the second pipeline, and the other end connected to the plurality of fourth pipelines respectively through the fifth pipeline; as well as At least one seventh pipeline is connected between two adjacent thermal storage devices. The airflow generating device is located in the second pipeline between the fifth pipeline and the sixth pipeline.

8. The high-temperature molten waste residue waste heat utilization system according to claim 7, characterized in that, A first valve is installed on the first pipeline at a position near the fluidized bed on the side of the plurality of third pipelines. A second valve is installed on the first pipeline at a position near the boiler on the side of the plurality of third pipelines. Each of the plurality of third pipelines is equipped with a third valve. Each of the plurality of fourth pipelines is equipped with a fourth valve. A fifth valve is installed on the fifth pipeline at a position near the second pipeline on the side of the sixth pipeline. A sixth valve is installed on the sixth pipeline. A seventh valve is installed on the second pipeline at a position far from the airflow generating device on the side of the sixth pipeline. An eighth valve is installed on the second pipeline at a position far from the airflow generating device on the side of the fifth pipeline. A ninth valve is installed on the seventh pipeline.

9. The high-temperature molten waste residue waste heat utilization system according to any one of claims 1-3, characterized in that, It also includes a particle separator located at the air outlet of the fluidized bed, and a return inclined pipe is provided between the bottom end of the particle separator and the fluidized bed.

10. The high-temperature molten waste residue waste heat utilization system according to any one of claims 1-3, characterized in that, The heat exchange gas is an inert gas.

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