Industrial waste heat energy storage and utilization system

Abstract

The invention provides an industrial waste heat energy storage and utilization system, and relates to the flue gas waste heat recycling technology, the industrial waste heat energy storage and utilization system comprises a heat source, a heat storage assembly, a first control valve, a second control valve, a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline communicates with the heat storage assembly, the other end of the first pipeline communicates with the heat source, and one end of the second pipeline communicates with the heat storage assembly; the other end of the second pipeline communicates with a heat source, and one end of the third pipeline communicates with the heat storage assembly. According to the industrial waste heat energy storage and utilization system provided by the invention, the heat source, the first pipeline, the heat storage assembly and the third pipeline form the discharge passage. Before the heat source is heated, the driving device drives the fluid to circularly flow in the first loop, the fluid absorbs heat at the heat storage assembly and releases heat at the heat source, and preheating of the heat source is achieved. Through the combination of the first loop and the discharge passage, the utilization rate of high-temperature flue gas in the intermittent industrial production process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas waste heat recovery and utilization, and in particular to an industrial waste heat energy storage and utilization system. Background Art

[0002] Under the background of the "3060" dual carbon goals, the new industrial system with energy conservation and emission reduction as the main body has put forward higher requirements for energy conservation and energy storage. With the gradual implementation of the "carbon peak and carbon neutrality" policy, my country's industrial structure continues to adjust accordingly, and the green development strategy of coordinated environment and economy is continuously implemented.

[0003] However, the existing intermittent industrial production process often lacks a complete waste heat recovery system, and usually directly uses flue gas for heating, which can only be relatively effectively utilized when the heating demand is large. When the heating demand is disclosed, the waste heat in the high-temperature flue gas generated in most production processes is not fully utilized, resulting in energy waste. Summary of the invention

[0004] The present invention provides an industrial waste heat energy storage and utilization system to solve the defect of insufficient utilization of high-temperature flue gas in existing intermittent industrial production processes.

[0005] The industrial waste heat energy storage and utilization system provided by the present invention includes a heat source, a heat storage component, a first control valve, a second control valve, a first pipeline, a second pipeline and a third pipeline, wherein one end of the first pipeline is connected to the heat storage component, the other end of the first pipeline is connected to the heat source, one end of the second pipeline is connected to the heat storage component, the other end of the second pipeline is connected to the heat source, and one end of the third pipeline is connected to the heat storage component; The heat source, the first pipeline, the heat storage component and the second pipeline constitute a first loop; The heat source, the first pipeline, the heat storage component and the third pipeline constitute a discharge passage; The first control valve is connected to the first circuit and is used to control the opening or closing of the first circuit; The second control valve is connected to the exhaust passage and is used to control the opening or closing of the exhaust passage; It also includes a driving device for driving the fluid to flow in the first circuit and the discharge passage. A heat storage medium is arranged in the heat storage assembly. The first circuit and the discharge passage respectively pass through the heat storage medium and exchange heat with the heat storage medium.

[0006] The industrial waste heat energy storage and utilization system provided by the present invention further includes a controller, and the first control valve, the second control valve and the drive device are respectively connected to the controller for communication.

[0007] According to the industrial waste heat energy storage and utilization system provided by the present invention, the heat storage component includes a connecting pipeline and a plurality of heat storage units, the heat storage medium is arranged in the heat storage unit, the connecting pipeline passes through the heat storage units in sequence, one end of the connecting pipeline is connected to the first pipeline, and the other end is connected to the second pipeline and the third pipeline.

[0008] According to the industrial waste heat energy storage and utilization system provided by the present invention, each connecting pipeline includes a plurality of connecting pipe groups connected in series, and the connecting pipe groups correspond to the heat storage units one by one. Each connecting pipe group includes a heat exchange pipe and a branch pipe arranged in parallel. The heat exchange pipe passes through the heat storage unit corresponding thereto, and the branch pipe is located outside the heat storage unit. The heat exchange pipe is connected to a third control valve, and the branch pipe is connected to a fourth control valve.

[0009] According to the industrial waste heat energy storage utilization system provided by the present invention, the third control valve and the fourth control valve are respectively connected to the controller for communication.

[0010] According to the industrial waste heat energy storage and utilization system provided by the present invention, two connecting pipelines are provided, namely a first connecting pipeline and a second connecting pipeline, one end of the first connecting pipeline is connected to the first pipeline, and the other end of the first connecting pipeline is connected to the second pipeline, one end of the second connecting pipeline is connected to the first pipeline, and the other end of the second connecting pipeline is connected to the third pipeline.

[0011] According to the industrial waste heat energy storage and utilization system provided by the present invention, two first pipelines are provided, one first pipeline is connected to the first connecting pipeline, and the other first pipeline is connected to the second connecting pipeline.

[0012] According to the industrial waste heat energy storage and utilization system provided by the present invention, each heat storage unit is respectively connected to a first temperature transmitter, and the heat source is connected to a second temperature transmitter. The first temperature transmitter is used to collect the temperature signal in the heat storage unit, and the second temperature transmitter is used to collect the temperature signal of the heat source. The first temperature transmitter and the second temperature transmitter are respectively connected to the controller for communication.

[0013] The industrial waste heat energy storage and utilization system provided by the present invention also includes a heat exchanger and a heat exchange pipe. A fifth control valve is connected to the air inlet or outlet of the heat source. The heat exchange pipe is connected in parallel with the heat source and the fifth control valve. The heat exchanger is connected to the heat exchange pipe, and a sixth control valve is connected to the heat exchange pipe.

[0014] According to the industrial waste heat energy storage and utilization system provided by the present invention, the heat storage temperature of the heat storage unit gradually decreases along the extension direction of the connecting pipeline.

[0015] The industrial waste heat energy storage and utilization system provided by the present invention constructs an emission passage through a heat source, a first pipeline, a heat storage component and a third pipeline. The high-temperature flue gas generated at the heat source is discharged through the emission passage after passing through the heat storage component. The heat storage medium in the heat storage component absorbs and stores the heat of the high-temperature fluid to achieve heat recovery. A first loop is constructed by the heat source, the first pipeline, the heat storage component and the second pipeline. Before heating the heat source, the fluid is driven to circulate in the first loop through a driving device, and the fluid absorbs heat at the heat storage component and releases heat at the heat source, thereby achieving preheating of the heat source. Through the combination of the first loop and the emission passage, the utilization rate of high-temperature flue gas in intermittent industrial production processes is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the industrial waste heat energy storage and utilization system provided by the present invention.

[0018] Figure 2 It is a structural schematic diagram of the first connecting pipeline and the second connecting pipeline of the industrial waste heat energy storage and utilization system provided by the present invention.

[0019] Figure 3 It is a schematic diagram of the connection relationship of the heat exchanger of the industrial waste heat energy storage and utilization system provided by the present invention.

[0020] Reference numerals: 1. heat source; 11. second temperature transmitter; 12. fifth control valve; 13. smoke exhaust pipe; 131. smoke exhaust damper; 2. first pipe; 3. second pipe; 31. first control valve; 4. third pipe; 41. second control valve; 5. drive device; 6. heat storage unit; 61. heat exchange pipe; 611. third control valve; 62. branch pipe; 621. fourth control valve; 63. first connecting pipeline; 64. second connecting pipeline; 65. first temperature transmitter; 7. heat exchanger; 71. heat exchange pipeline; 72. sixth control valve; 73. third temperature transmitter; 8. first flow meter; 81. second flow meter. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The features of the terms "first" and "second" in the specification and claims of the present invention may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects before and after are in an "or" relationship.

[0023] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] Combine the following Figure 1-Figure 2 The industrial waste heat energy storage and utilization system of the present invention is described.

[0025] The industrial waste heat energy storage and utilization system provided by the present invention includes a heat source 1, a heat storage component, a first control valve 31, a second control valve 41, a first pipeline 2, a second pipeline 3 and a third pipeline 4. One end of the first pipeline 2 is connected to the heat storage component, and the other end of the first pipeline 2 is connected to the heat source 1. One end of the second pipeline 3 is connected to the heat storage component, and the other end of the second pipeline 3 is connected to the heat source 1. One end of the third pipeline 4 is connected to the heat storage component, and the other end is connected to the outside air. The heat source 1, the first pipeline 2, the heat storage component and the second pipeline 3 constitute a first loop. The heat source 1, the first pipeline 2, the heat storage component and the third pipeline 4 constitute a discharge passage. The first control valve 31 is connected to the first loop for controlling the opening or closing of the first loop. The second control valve 41 is connected to the discharge passage for controlling the opening or closing of the discharge passage. It also includes a driving device 5 for driving the fluid to flow in the first loop and the discharge passage. A heat storage medium is provided in the heat storage component, and the first loop and the discharge passage respectively pass through the heat storage medium and exchange heat with the heat storage medium.

[0026] Specifically, Figure 1 As shown, the heat source 1 is connected to the heat storage component through the first pipeline, and a discharge passage is constructed, and the opening and closing of the discharge passage is controlled by the second control valve 41. The high-temperature gas discharged from the heat source 1 passes through the heat storage medium in the heat storage component through the discharge passage, and the driving device 5 drives the high-temperature gas to flow in the discharge passage. The heat storage medium absorbs the heat of the high-temperature gas generated by the heat source 1 and stores it in the heat storage component, completing the recovery of the heat of the high-temperature gas generated by the heat source 1. The high-temperature gas after the heat exchange is discharged through the third pipeline 4. Secondly, the heat source 1 is connected to the heat storage component through the first pipeline 2 and the second pipeline 3, and a first loop is constructed, and the opening and closing of the first loop is controlled by the first control valve 31. The driving device 5 drives the gas to circulate in the first loop and drives the gas to flow from the heat source 1 to the third pipeline 4 in the discharge passage. The driving device 5 is set as a fan. The air flowing in the first loop absorbs heat at the heat storage component and releases heat at the heat source 1, thereby preheating the heat source 1.

[0027] Specifically, Figure 1 As shown, the heat source 1 can be set as an intermittent industrial kiln or other intermittent heating furnace. The heat storage medium can be set as a phase change medium or a non-phase change medium. When the intermittent industrial kiln works continuously, it needs to frequently perform intermittent work of heating and cooling, so it cannot maintain continuous high temperature, resulting in a large amount of heat waste. When using the industrial waste heat energy storage utilization system, one end of the first pipe 2 is connected to the exhaust port of the intermittent industrial kiln. The high-temperature flue gas enters the heat storage component from the first pipe 2. When the high-temperature flue gas passes through the heat storage unit 6, the heat storage medium in the heat storage component is heated, and the temperature of the flue gas gradually decreases, and then it is discharged from the third pipe 4. When the cooled kiln needs to be heated again, before the kiln is heated, the intermittent industrial kiln is connected to the heat storage component through the first pipe 2 and the second pipe 3 to form a first loop. The air in the first loop is driven to circulate by the driving device 5, and the air absorbs the heat of the heat storage medium when passing through the heat storage component. When air passes through the intermittent industrial kiln, it releases heat to preheat the kiln, thereby improving the utilization rate of thermal energy and reducing energy loss. Considering the influence of high temperature, the first pipeline 2 is made of heat-resistant steel or silicon carbon tube material.

[0028] The present invention provides an industrial waste heat energy storage and utilization system, which constructs an emission passage through a heat source 1, a first pipeline 2, a heat storage component and a third pipeline 4. The high-temperature flue gas generated at the heat source 1 is discharged through the emission passage after passing through the heat storage component. The heat storage medium in the heat storage component absorbs and stores the heat of the high-temperature fluid to achieve heat recovery. A first loop is constructed by the heat source 1, the first pipeline 2, the heat storage component and the second pipeline 3. Before heating the heat source 1, the fluid is driven to circulate in the first loop through the driving device 5, and the fluid absorbs heat at the heat storage component and releases heat at the heat source 1, thereby achieving preheating of the heat source 1. Through the combination of the first loop and the emission passage, the utilization rate of high-temperature flue gas in intermittent industrial production processes is improved.

[0029] Furthermore, a controller is included, and the first control valve 31, the second control valve 41 and the drive device 5 are respectively connected to the controller for communication. The controller uniformly controls the drive device 5, the first control valve 31 and the second control valve 41, thereby coordinating the working state of the exhaust passage and the first circuit.

[0030] Specifically, the driving device 5 is configured as a reversible variable frequency fan, which is respectively connected to the first circuit and the third pipeline 4. The controller adjusts the operating power of the reversible variable frequency fan by sending a control instruction to the reversible variable frequency fan, thereby adjusting the flow speed of the gas in the discharge passage and the first circuit, and realizing the adjustment of the heat exchange rate between the heat storage medium and the gas in the discharge passage and the first circuit.

[0031] In an optional embodiment, a first flow meter 8 is connected to the discharge channel, and a second flow meter 81 is connected to the first loop. The first flow meter 8 and the second flow meter 81 are respectively connected to the controller in communication. Specifically, the first flow meter 8 is connected to the third pipe 4, and the second flow meter 81 can be connected to the first pipe 2 or the second pipe 3. The first flow meter 8 is used to measure the flow rate of the flue gas passing through the discharge channel, and the second flow meter 81 is used to measure the flow rate of the gas circulating in the first loop. The signals measured by the first flow meter 8 and the second flow meter 81 are transmitted to the controller.

[0032] Furthermore, the heat storage component includes a connecting pipeline and multiple heat storage units 6, the heat storage medium is arranged in the heat storage unit 6, the connecting pipeline passes through the heat storage unit 6 in sequence, one end of the connecting pipeline is connected to the first pipeline 2, and the other end is connected to the second pipeline 3 and the third pipeline 4.

[0033] Specifically, Figure 1As shown, the first pipeline 2, the second pipeline 3 and the third pipeline 4 are respectively connected through the connecting pipeline, so as to construct the first loop and the discharge loop. The heat storage unit 6 is configured as a heat storage tank, and the heat storage medium is arranged in the heat storage tank. The top of the heat storage tank is provided with an openable top cover, which is convenient for maintenance and experimental replacement of the heat storage medium. The connecting pipeline passes through the heat storage unit 6 and is immersed in the heat storage medium in the heat storage unit 6. The fluid passes through the connecting pipeline to realize the heat exchange between the heat storage medium and the fluid. By providing a plurality of heat storage units 6, the connecting pipelines that pass through the heat storage units 6 in sequence perform stepwise heat exchange at the heat storage units 6, thereby improving the heat storage and heat exchange capacity.

[0034] In an optional embodiment, a connecting pipeline is provided, one end of which is connected to the first pipeline 2, and the other end of which is connected to the second pipeline 3 and the third pipeline 4 at the same time. The first control valve 31 is connected to the second pipeline 3, and the second control valve 41 is connected to the third pipeline 4. The heat storage and heat release processes of the heat storage medium are both carried out in the same connecting pipeline. When the heat storage medium stores heat, the first control valve 31 is closed, the second control valve 41 is opened, and the high-temperature flue gas at the heat source 1 enters the connecting pipeline from the first pipeline 2. The heat storage medium absorbs the heat of the connecting pipeline to achieve heat storage. When the heat storage medium releases heat. The first control valve 31 is opened, the second control valve 41 is closed, and the driving device 5 drives the air to circulate in the first circuit. When the air passes through the connecting pipeline, the heat storage medium heats the air, and the air passes through the heat source 1 to preheat the heat source 1.

[0035] Further, in another optional embodiment, as Figure 1 As shown, two connecting pipelines are provided. The two connecting pipelines are respectively provided with a first connecting pipeline 63 and a second connecting pipeline 64. One end of the first connecting pipeline 63 is connected to the first pipeline 2, and the other end of the first connecting pipeline 63 is connected to the second pipeline 3. One end of the second connecting pipeline 64 is connected to the first pipeline 2, and the other end of the second connecting pipeline 64 is connected to the third pipeline 4.

[0036] When the heat storage medium is storing heat, the high-temperature flue gas generated by the kiln passes through the connecting pipe. The high-temperature flue gas of the kiln will carry a lot of dust, and the dust will remain attached in the connecting pipe. When a single connecting pipe is used, as the air circulates in the first circuit, the residual dust will enter the kiln, affecting the quality of the blanks in the kiln. By setting two connecting pipes, the first connecting pipe 63 is connected to the second pipe 3, so that the heat release process of the heat storage medium is carried out in the first connecting pipe 63. The second connecting pipe 64 is connected to the third pipe 4, so that the heat storage process of the heat storage medium is carried out in the second connecting pipe 64, and the flue gas during the combustion of the kiln is concentrated in the second connecting pipe 64. Therefore, the heat absorption process and the heat release process of the connecting pipe are separated, reducing the pollution of dust to the preheating of the kiln. The smoke outlet of the kiln is connected to a smoke exhaust pipe, and the smoke exhaust pipe is connected to a smoke exhaust damper. When the discharge passage is blocked and heat cannot be stored, the smoke exhaust damper is opened by the controller to discharge the high-temperature smoke. The pipeline of the second connecting pipeline 64 is connected by heat-resistant steel or silicon carbon pipe considering the influence of high temperature.

[0037] Furthermore, two first pipelines 2 are provided, one first pipeline 2 is connected to the first connecting pipeline 63 , and the other first pipeline 2 is connected to the second connecting pipeline 64 .

[0038] Specifically, Figure 1 As shown, two first pipes 2 are also provided, and the two first pipes 2 are respectively connected with a driving device 5. One first pipe 2 is connected with the first connecting pipe 63, and the other first pipe 2 is connected with the second connecting pipe 64. One first pipe 2 is connected with the first connecting pipe 63, the second pipe 3 and the kiln as the heat source 1 to form a first loop, and the other first pipe 2 and the kiln as the heat source 1, the second connecting pipe 64 and the third pipe 4 are used as an exhaust passage. The first loop and the exhaust passage are completely independent, which further reduces the pollution of dust to the kiln preheating.

[0039] Further, each connecting pipeline includes a plurality of connecting pipe groups connected in series, and the connecting pipe groups correspond to the heat storage units 6 one by one. Each connecting pipe group includes a heat exchange pipe 61 and a branch pipe 62 arranged in parallel, the heat exchange pipe 61 is arranged in the corresponding heat storage unit 6, and the branch pipe 62 is located outside the heat storage unit 6. The heat exchange pipe 61 is connected to a third control valve 611, and the branch pipe 62 is connected to a fourth control valve 621.

[0040] Specifically, Figure 1As shown, when two connecting pipelines are provided, the connecting pipelines are provided with the same structure. Each connecting pipeline includes a plurality of connecting pipe groups arranged in series, and the connecting pipe group includes a heat exchange pipe 61 arranged in the heat storage unit 6 and a branch pipe 62 arranged outside the heat storage unit 6, and the branch pipe 62 is connected in parallel with the heat exchange pipe 61. The connection and closing of the heat exchange pipe 61 are controlled by the third control valve 611, and the connection and closing of the branch pipe 62 are controlled by the fourth control valve 621. When the third control valve 611 is connected and the fourth control valve 621 is closed, the fluid in the connecting pipeline passes through the heat storage unit 6 corresponding to the heat exchange pipe 61 through the heat exchange pipe 61, and exchanges heat with the heat storage medium in the heat storage unit 6. When the third control valve 611 is closed and the fourth control valve 621 is connected, the fluid in the connecting pipeline passes through the branch pipe 62 without entering the heat storage unit 6 corresponding to the connecting pipe group, so that the fluid does not enter the heat storage unit 6 and directly enters the next connecting pipe group. Therefore, any one or more heat storage units 6 can be used to participate in the heat exchange of the fluid in the connecting pipeline according to the actual heat storage or preheating requirements.

[0041] Furthermore, the heat storage temperature of the heat storage unit 6 gradually decreases along the extending direction of the connecting pipeline.

[0042] Specifically, when the heat storage unit 6 is storing heat, after the intermittent high-temperature flue gas flows out through the intermittent kiln exhaust port, the high-temperature flue gas is discharged from the kiln through the first pipe 2, the connecting pipe and the third pipe 4. The heat storage temperature of the heat storage unit 6 gradually decreases along the flow direction of the high-temperature flue gas in the connecting pipe, so that the maximum absorbable heat of the heat storage medium in the heat storage unit 6 gradually decreases along the flow direction of the high-level flue gas. The connecting pipe passes through the heat storage unit 6 to recover the flue gas heat and store it in the heat storage unit 6 with a gradually decreasing working temperature.

[0043] Specifically, the heat storage medium near the flue gas inlet end of the connecting pipeline uses a high-temperature heat storage medium, such as a high-temperature molten salt. The high-temperature flue gas exchanges heat with the heat storage medium through the connecting pipeline. The heat storage medium continuously absorbs heat during the heat exchange process with the flue gas, and the temperature gradually increases. This process mainly involves sensible heat storage. After reaching the melting point, the heat storage medium begins to melt and stores heat through phase change heat storage. As the heat exchange process proceeds, the molten salt continues to store the waste heat of the high-temperature flue gas through sensible heat storage after melting. The flue gas temperature of each level of flue gas waste heat recovery unit is between the melting point and the upper limit temperature of the phase change heat storage medium described in the corresponding level. The heat storage medium far away from the flue gas inlet end of the connecting pipeline uses a low-temperature heat storage medium, such as water or heat transfer oil, for heat storage. It is realized that heat storage is realized step by step according to the flue gas temperature during heat storage. When the heat of the heat storage medium is utilized, heat storage units 6 of different energy levels can be selected for utilization as needed, thereby improving the energy utilization effect.

[0044] Furthermore, the third control valve 611 and the fourth control valve 621 are respectively connected to the controller for communication.

[0045] Specifically, the controller controls the connection and closing of the third control valve 611 and the fourth control valve 621 , thereby achieving unified selection and control of the working heat storage unit 6 .

[0046] Furthermore, each heat storage unit 6 is respectively connected to a first temperature transmitter 65, and the heat source 1 is respectively connected to a second temperature transmitter 11. The first temperature transmitter 65 is used to collect the temperature signal in the heat storage unit 6, and the second temperature transmitter 11 is used to collect the temperature signal of the heat source 1. The first temperature transmitter 65 and the second temperature transmitter 11 are respectively connected to the controller for communication.

[0047] Specifically, Figure 1 As shown, each heat storage unit 6 is connected to a first temperature transmitter 65, which extends into the heat storage unit 6. The first temperature transmitter 65 collects the real-time temperature data of the heat storage medium in the heat storage unit 6. The heat source 1 is connected to a second temperature transmitter 11, which extends into the kiln as the heat source 1, so as to collect the real-time temperature data in the kiln. When the controller and the first temperature transmitter 65 and the second temperature transmitter 11 are performing heat storage, the controller selects the corresponding heat storage unit 6 for heat storage according to the temperature in the kiln, and the high-temperature flue gas preferentially flows into the matching highest working temperature level heat storage unit 6, and then flows through the next level heat storage unit 6 in sequence. The temperature of the high-temperature flue gas drops after each heat exchange process until the last level heat storage unit 6, where the low-working temperature heat storage medium absorbs the remaining low-grade heat energy of the flue gas and then discharges it to the outdoor environment, thereby realizing the step-by-step storage and transmission of the flue gas waste heat according to the energy quality, thereby improving the heat storage effect.

[0048] Alternatively, in order to prevent each heat storage unit 6 from exceeding the operating temperature range during the heat storage process, resulting in overheating of the heat storage medium and causing an accident, the controller automatically monitors the real-time temperature Ti of the heat storage medium in each heat storage unit 6 through the first temperature transmitter 65. When Ti exceeds the upper limit operating temperature Timax of the heat storage medium, the controller can control the third control valve 611 corresponding to the heat storage unit 6 to be connected and the fourth control valve 621 to be closed, so that the high-temperature flue gas bypasses the heat storage unit 6 from the branch pipe 62 and directly enters the next-level heat storage unit 6 for heat storage, thereby protecting the heat storage unit 6.

[0049] Furthermore, it also includes a heat exchanger 7 and a heat exchange pipe 71. The air inlet or outlet of the heat source 1 is connected to a fifth control valve 12. The heat exchange pipe 71 is connected in parallel with the heat source 1 and the fifth control valve 12. The heat exchanger 7 is connected to the heat exchange pipe 71. The heat exchange pipe 71 is connected to a sixth control valve 72.

[0050] Specifically, Figure 1As shown, the heat exchanger 7 is connected in parallel to the heat source 1 through the heat exchange pipe 71, the heat pipe inlet of the heat exchanger 7 is connected to the air outlet of the heat source 1 through the heat exchange pipe 71, and the heat pipe outlet of the heat exchanger 7 is connected to the air outlet of the heat source 1 through the heat exchange pipe 71. The fifth control valve 12 and the sixth control valve 72 are respectively used to control the hot fluid to pass through the heat source 1 or the heat exchanger 7, and the fifth control valve 12 is set at the air inlet of the heat source 1. When the stored heat energy in the heat storage unit 6 is used, the fifth control valve 12 can be opened to allow the hot air to pass through the heat source 1 to preheat the heat source 1. When the heat energy is sufficient, the sixth control valve 72 can also be opened to allow the hot air to pass through the heat pipe of the heat exchanger 7 to provide a heat source for the heat exchanger 7. The heat exchange medium can be passed into the cold pipe of the heat exchanger 7, and the heat exchange medium is heated when the hot air passes through the heat pipe. The heated heat exchange medium can be used to provide heat to the user end, further improving the utilization rate of heat energy. Specifically, the fifth control valve 12 and the sixth control valve 72 can be respectively connected to the controller for communication. The controller controls the fifth control valve 12 and the sixth control valve 72 according to the heat stored in the heat storage unit 6 and the heat required for preheating of the heat source 1, so that the excess heat stored in the heat storage unit 6 is applied to heating at the heat exchanger 7.

[0051] Specifically, Figure 3 As shown, a third temperature transmitter 73 located at the air outlet of the heat exchanger 7 can be connected to the heat exchange pipe 71, and the third temperature transmitter 73 is in communication with the controller. The air is heated after passing through the heat storage unit 6, and then the hot air enters the heat exchanger 7 through the heat exchange pipe 71. The controller senses the temperature of the hot air entering and exiting the heat exchanger 7 through the third temperature transmitter 73, thereby monitoring the heat exchange effect at the heat exchanger 7.

[0052] The present invention also provides a method for using the industrial waste heat energy storage utilization system, comprising the following steps: S1. Obtain the temperature of high-temperature flue gas generated by the waste heat source of industrial high-temperature flue gas, and determine the functional relationship between the exhaust temperature and the exhaust volume to ensure the normal production of the industrial kiln, and automatically adjust the frequency of the reversible variable frequency fan according to the exhaust temperature to control the high-temperature flue gas flow; S2. Determine the operating temperature range of each level of heat storage unit 6 according to the physical properties of the heat storage medium, obtain the actual temperature of the heat storage medium in the heat storage unit 6, and determine the high-temperature flue gas gradient heat storage scheme according to the exhaust temperature and the actual temperature of the heat storage medium; S3, obtaining the heating demand of each user end, including the heating temperature range and the heating amount, and determining the utilization plan of the heat storage unit 6 according to the heating demand of the user end and the actual temperature of the heat storage medium in the heat storage unit 6; S4. Determine the functional relationship between the temperature and flow rate of the heat exchange medium in each level of heat storage unit 6 and the actual temperature of the heat storage medium in the heat storage unit 6. According to the obtained temperature of the heat exchange medium and the user source heating demand, control the temperature of the heat exchange medium by controlling the fan frequency of the corresponding heat storage utilization circuit.

[0053] Generally speaking, the flue gas temperature T1 of industrial kilns is positively correlated with the flue gas volume. To ensure the normal production of industrial kilns, the flue gas generated by industrial kilns needs to be discharged in time and cannot be accumulated. The temperature of the high-temperature flue gas of the industrial kiln is obtained through the temperature transmitter. The controller automatically adjusts the high-temperature flue gas flow rate according to the functional relationship between the exhaust temperature T1 and the exhaust volume to ensure the normal production of the industrial kiln.

[0054] Specifically, Figure 1 As shown, there are five heat storage units 6 divided into five levels, and two connecting pipes are provided, which are respectively set as a first connecting pipe 63 and a second connecting pipe 64, and the connecting pipes pass through each heat storage unit 6 in sequence. Figure 1 The dotted line portion passing through the heat storage unit 6 is the second connecting pipe 64, and the solid line portion passing through the heat storage unit 6 is the first connecting pipe 63. The specific structure of the first connecting pipe 63 and the second connecting pipe 64 includes five connecting pipe groups connected in series, and the connecting pipe groups correspond to the heat storage units 6 one by one. Each connecting pipe group includes a heat exchange pipe 61 and a branch pipe 62 arranged in parallel, the heat exchange pipe 61 passes through the corresponding heat storage unit 6, and the branch pipe 62 is located outside the heat storage unit 6 ( Figure 1 The specific structure of the second connecting pipe 64 is not shown). The connection structure relationship between the connecting pipe groups on the first connecting pipe 63 and the second connecting pipe 64 and the heat storage unit 6 corresponding to the connecting pipe groups is as follows: Figure 2 As shown, the heat exchange pipe 61 is connected to a third control valve 611, and the branch pipe 62 is connected to a fourth control valve 621. The first pipeline 2 is provided with two, and along the flow direction of the high-temperature flue gas in the connecting pipeline, the working temperature of the heat storage medium in the heat storage unit 6 gradually decreases. Specifically, the maximum working temperature of the heat storage unit A1 is set to 600°C, the maximum working temperature of the heat storage unit A2 is set to 450°C, the maximum working temperature of the heat storage unit A3 is set to 300°C, the maximum working temperature of the heat storage unit A4 is set to 150°C, and the maximum working temperature of the heat storage unit A5 is set to 80°C, wherein A 1-3 The heat storage medium of A is set to molten salt, the heat storage medium of A4 is set to heat transfer oil, and the heat storage medium of A5 is set to water.

[0055] When performing heat storage, the third control valve 611 and the fourth control valve 621 on the first connecting pipeline 63 are closed, and the first connecting pipeline 63 is closed. When the temperature of the high-temperature flue gas is greater than the actual temperature of the heat storage medium in the first-stage heat storage unit A1, the controller opens the third control valves 611 on the second connecting pipeline 64 and closes the fourth control valves 621. The high-temperature flue gas flows from the first-stage heat storage unit 6 to the lower-stage heat storage unit 6 step by step, completes heat storage, and is finally discharged into the atmosphere. In this way, the waste heat of the high-temperature flue gas can improve the heat storage quality while expanding the heat storage.

[0056] When the heat stored in the heat storage medium in the heat storage unit 6 is used, the fan on the first circuit is turned on, and all the third control valves 611 and the fourth control valves 621 on the second connecting pipeline 64 are closed, or the second control valve 41 at the end of the second connecting pipeline 64 is closed to close the discharge passage. The fifth control valve 12 located at both ends of the kiln is opened, and the air passes through the heat storage unit 6, and the heat storage unit 6 heats the air and then enters the kiln to preheat the kiln. The sixth control valve 72 is opened, and the hot air passes through the heat pipe of the heat exchanger 7 to provide a heat source for the heat exchanger 7 and heat the heat exchanger 7.

[0057] The actual temperature of the kiln or heat exchanger 7 is T, and the i-th stage heat storage unit A i The actual temperature of the heat storage medium is Ti (i=5, 4, 3, 2). <T i When the i-th heat storage unit 6 is selected as the working unit, the controller opens the first connecting pipe 63 connected to the heat storage unit A. i The corresponding third control valve 611 closes the first connecting pipe 63 connected to the heat storage unit A. i The corresponding fourth control valve 621 closes the other third control valve 611 on the first connecting pipeline 63 and opens the other fourth control valve 621 on the first connecting pipeline 63. The gas in the first circuit will pass through the heat storage unit A. i After that, it directly enters the kiln or heat exchanger, and other heat storage units do not participate in the heating of the circulating air in the first loop.

[0058] When T i >T>T i -ε, ε is the set heat exchange temperature difference. To improve the heat exchange efficiency, the i-th level and the i-1-th level are selected as working units. Specifically, the controller opens the first connecting pipe 63 connected to the heat storage unit A. i and A i-1 The corresponding third control valve 611 closes the first connecting pipe 63 connected to the heat storage unit A. i and thermal storage unit A i-1The corresponding fourth control valve 621 closes the other third control valve 611 on the first connecting pipeline 63 and opens the other fourth control valve 621 on the first connecting pipeline 63. The gas in the first circuit will pass through the heat storage unit A in sequence. i and thermal storage unit A i-1 After that, it directly enters the kiln or heat exchanger, while other heat storage units do not participate in the heating of the circulating air in the first loop. i The residual heat in the heat storage unit A will i-1 The air is preheated to improve the utilization rate of thermal energy. i <T<T i-1 When , the i-1th level heat storage unit is selected as the working unit until T i-1 -εT <T i-1 , the i-1th level and the i-2th level are selected as working units.

[0059] And automatically adjust the power of the reversible variable frequency fan to keep the heat exchange medium in the first circuit heated continuously, that is, when the temperature difference between the heat exchange medium and the heat storage medium is smaller, appropriately reduce the power of the reversible variable frequency fan to reduce the heat exchange medium flow rate to increase the heat exchange medium temperature. At this time, the heat exchange medium continues to absorb the heat of the heat storage medium in the heat storage unit and continuously heats the kiln or heat exchanger. In this cycle, the working unit gradually moves from the 5th level heat storage unit to the 1st level heat storage unit until the available heat storage in the 1st level heat storage unit is exhausted and the entire heat storage utilization process stops.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An industrial waste heat energy storage and utilization system, comprising a heat source, characterized in that: It also includes a heat storage component, a first control valve, a second control valve, a first pipeline, a second pipeline and a third pipeline, wherein one end of the first pipeline is connected to the heat storage component, the other end of the first pipeline is connected to the heat source, one end of the second pipeline is connected to the heat storage component, the other end of the second pipeline is connected to the heat source, and one end of the third pipeline is connected to the heat storage component; The heat source, the first pipeline, the heat storage component and the second pipeline constitute a first loop; The heat source, the first pipeline, the heat storage component and the third pipeline constitute a discharge passage; The first control valve is connected to the first circuit and is used to control the opening or closing of the first circuit; The second control valve is connected to the exhaust passage and is used to control the opening or closing of the exhaust passage; It also includes a driving device for driving the fluid to flow in the first circuit and the discharge passage. A heat storage medium is arranged in the heat storage assembly. The first circuit and the discharge passage respectively pass through the heat storage medium and exchange heat with the heat storage medium.

2. The industrial waste heat energy storage and utilization system according to claim 1 is characterized in that: It also includes a controller, and the first control valve, the second control valve and the driving device are respectively connected to the controller for communication.

3. The industrial waste heat energy storage and utilization system according to claim 2 is characterized in that: The heat storage assembly includes a connecting pipeline and a plurality of heat storage units, the heat storage medium is arranged in the heat storage unit, the connecting pipeline passes through the heat storage units in sequence, one end of the connecting pipeline is connected to the first pipeline, and the other end is connected to the second pipeline and the third pipeline.

4. The industrial waste heat energy storage and utilization system according to claim 3 is characterized in that: Each of the connecting pipelines includes a plurality of connecting pipe groups connected in series, and the connecting pipe groups correspond to the heat storage units one by one. Each of the connecting pipe groups includes a heat exchange pipe and a branch pipe arranged in parallel, and the heat exchange pipe passes through the corresponding heat storage unit, and the branch pipe is located outside the heat storage unit. The heat exchange pipe is connected to a third control valve, and the branch pipe is connected to a fourth control valve.

5. The industrial waste heat energy storage and utilization system according to claim 4 is characterized in that: The third control valve and the fourth control valve are respectively connected to the controller for communication.

6. The industrial waste heat energy storage and utilization system according to claim 3 is characterized in that: The connecting pipelines are provided with two, namely a first connecting pipeline and a second connecting pipeline, one end of the first connecting pipeline is connected to the first pipeline, the other end of the first connecting pipeline is connected to the second pipeline, one end of the second connecting pipeline is connected to the first pipeline, and the other end of the second connecting pipeline is connected to the third pipeline.

7. The industrial waste heat energy storage and utilization system according to claim 6 is characterized in that: The first pipelines are provided with two, one of which is communicated with the first connecting pipeline, and the other of which is communicated with the second connecting pipeline.

8. The industrial waste heat energy storage and utilization system according to claim 4 is characterized in that: Each of the heat storage units is respectively connected to a first temperature transmitter, and the heat source is connected to a second temperature transmitter. The first temperature transmitter is used to collect temperature signals in the heat storage unit, and the second temperature transmitter is used to collect temperature signals from the heat source. The first temperature transmitter and the second temperature transmitter are respectively connected to the controller for communication.

9. The industrial waste heat energy storage and utilization system according to claim 2, characterized in that: It also includes a heat exchanger and a heat exchange pipe. The air inlet or outlet of the heat source is connected to a fifth control valve. The heat exchange pipe is connected in parallel with the heat source and the fifth control valve. The heat exchanger is connected to the heat exchange pipe, and the heat exchange pipe is connected to a sixth control valve.

10. The industrial waste heat energy storage and utilization system according to any one of claims 3 to 8, characterized in that: The heat storage temperature of the heat storage unit gradually decreases along the extending direction of the connecting pipeline.

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