Energy storage system utilizing waste heat

Abstract

The utility model relates to the technical field of energy storage, and provides an energy storage system utilizing waste heat, which comprises a gas storage, a compressor, an energy storage heat exchanger, a liquid storage tank, an evaporator, an energy release heat exchanger and an expansion machine which are connected in sequence, and further comprises an industrial cement making module, the clinker warehouse is provided with a heat exchange part, the heat exchange part can collect clinker heat, and the heat exchange part is connected with a heat-needing component in the energy storage system to form heat exchange. By collecting waste heat in the clinker stage in industrial cement production and transmitting the heat to a heat-needing component of the energy storage system for use, clinker heat recovery is achieved, the heat utilization rate of the cement process is improved, the environmental heat effect caused by natural cooling of cement clinker in a clinker warehouse is reduced, the energy storage power generation efficiency of the energy storage system is improved, and the energy storage power generation efficiency is improved. And a synergistic effect is generated.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and particularly provides an energy storage system utilizing waste heat. Background Art

[0002] Cement manufacturing is a typical industry with high energy consumption, high carbon emissions and resource intensiveness. There are common problems in cement production such as large energy consumption, low efficiency and low economic benefits, and a large amount of waste heat is generated during the production process. During the cooling and conveying process after the production of cement clinker, the high-temperature clinker produced by the rotary kiln is cooled to 120 - 180 °C by devices such as grate coolers and then enters the storage yard and the clinker warehouse for natural cooling. In this process, a large amount of heat of the clinker is dissipated to the outside, resulting in a large amount of energy waste and environmental pollution. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an energy storage system utilizing waste heat, aiming to solve the problem that a large amount of waste heat in existing cement manufacturing is difficult to be effectively synergistically utilized.

[0004] To achieve the above purpose, the technical solution adopted in the embodiment of the utility model is: to provide an energy storage system utilizing waste heat, including a gas storage tank, a compressor, an energy storage heat exchanger, a liquid storage tank, an evaporator, an energy release heat exchanger and an expander connected in sequence. The energy storage system utilizing waste heat further includes an industrial cement manufacturing module, wherein: the industrial cement manufacturing module includes a clinker warehouse, the clinker warehouse is provided with a heat exchange part, the heat exchange part can collect the heat of the clinker, and the heat exchange part is connected to the heat-requiring components in the energy storage system to form heat exchange.

[0005] The energy storage system utilizing waste heat provided by the embodiment of the utility model has at least the following beneficial effects: by providing a heat exchange part in the clinker warehouse, the heat of the clinker is collected and sent into the energy storage system for heat exchange with the heat-requiring components of the energy storage system. By collecting the waste heat in the clinker stage of industrial cement manufacturing and transferring the heat to the heat-requiring components of the energy storage system for use, not only the recovery of the heat of the clinker is realized, the thermal utilization rate of the cement process is improved, and the environmental heat effect caused by the natural cooling of the cement clinker in the clinker warehouse is reduced, but also a part of the heat that needs to be heated by the energy storage system itself is saved, and the energy storage and power generation efficiency of the energy storage system is improved. The two functions support each other and also produce a synergistic effect.

[0006] In one embodiment, the heat-requiring component of the energy storage system utilizing waste heat includes an evaporator, and the heat exchange part is connected to the evaporator to form heat exchange.

[0007] In one embodiment, the heat-requiring component of the energy storage system utilizing waste heat further includes a preheater, the preheater is connected between the gas storage tank and the compressor, and the preheater is connected to the heat exchange part of the clinker warehouse to form heat exchange.

[0008] In one embodiment, the heat exchange part includes heat exchange tubes which are arranged at the upper part and / or the peripheral part of the clinker storage bin to collect the heat of the clinker, and the heat exchange tubes are connected to the evaporator and / or the heat exchanger to form heat exchange.

[0009] In one embodiment, the waste heat utilization energy storage system further includes a heat storage tank which is connected between the heat exchange part and the evaporator to store heat; and / or; the heat storage tank is connected between the heat exchange part and the preheater to store heat.

[0010] In one embodiment, the industrial cement production module further includes a grinding press, a conveyor and a fluidized bed. The conveyor is connected between the grinding press and the heat exchange bed to play a conveying role. The grinding press can grind and convey the cement in the clinker storage bin to the fluidized bed, and the fluidized bed can collect the heat of the cement and is connected to the evaporator and / or the preheater through a pipeline to form heat exchange.

[0011] In one embodiment, the industrial cement production module further includes a separator which is arranged on the pipeline connecting the fluidized bed and the evaporator / or the preheater to separate cement particles.

[0012] In one embodiment, the grinding press includes a roller press and a powder mill which are connected to each other and can both grind the cement to obtain finished powder cement.

[0013] In one embodiment, the conveyor includes a conveyor belt and a throwing feeder which are connected to each other, and the conveyor belt and the throwing feeder are both connected between the grinding press and the heat exchange bed to play a conveying role.

[0014] In one embodiment, the waste heat utilization energy storage system further includes a heat storage tank which is connected between the fluidized bed and the evaporator to store heat; and / or; the heat storage tank is connected between the fluidized bed and the preheater to store heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 FIG. is a schematic flow chart of an energy storage system for utilizing waste heat according to an embodiment provided by the present invention;

[0017] Figure 2 Flow schematic diagram of another energy storage system using waste heat provided by the present utility model;

[0018] Figure 3 Flow schematic diagram of yet another energy storage system using waste heat provided by the present utility model;

[0019] Figure 4 Flow schematic diagram of still another energy storage system using waste heat provided by the present utility model;

[0020] Figure 5 Flow schematic diagram of yet another energy storage system using waste heat provided by the present utility model;

[0021] Figure 6 Flow schematic diagram of another energy storage system using waste heat provided by the present utility model;

[0022] Figure 7 Flow schematic diagram of yet another energy storage system using waste heat provided by the present utility model.

[0023] Among them, each reference numeral in the figure:

[0024] 100, energy storage system using waste heat; 110, gas storage tank; 111, compressor; 112, energy storage heat exchanger; 113, liquid storage tank; 114, evaporator; 115, energy release heat exchanger; 116, expander; 117, preheater; 118, heat storage tank;

[0025] 200, industrial cement production module; 210, clinker storage; 2101, heat exchange part; 21011, heat exchange tube; 211, grinding mill; 212, conveyor; 213, fluidized bed; 214, separator; 215, cement preheater; 216, rotary kiln; 217, cooler; 218, cement storage. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "plural" is two or more unless otherwise specifically defined.

[0029] In the present utility model, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] The inventor found that in cement production, there are generally situations such as high energy consumption, low efficiency, and low economic benefits, and a large amount of waste heat is generated during the production process. Existing energy storage systems have a large number of heat-using components that can use the waste heat in the cement production process. This not only synergistically uses the heat dissipated during cement plant manufacturing but also reduces the heat use in the traditional energy storage system, improves the efficiency, and achieves a more superior technical effect.

[0031] Please refer to Figure 1 , the present utility model provides an energy storage system 100 using waste heat, including a gas storage tank 110, a compressor 111, an energy storage heat exchanger 112, a liquid storage tank 113, an evaporator 114, an energy release heat exchanger 115, and an expander 116 connected in sequence. The energy storage system 100 using waste heat further includes an industrial cement production module 200, where: the industrial cement production module 200 includes a clinker storage tank 210, and the clinker storage tank 210 is provided with a heat exchange part 2101. The heat exchange part 2101 can collect the clinker heat, and the heat exchange part 2101 is connected to the heat-requiring components in the energy storage system to form heat exchange. The energy storage medium of this energy storage system includes but is not limited to carbon dioxide, air, etc. In the embodiment of the present utility model, carbon dioxide is taken as an example of the energy storage medium for illustration.

[0032] Among them: The energy storage system based on the carbon dioxide gas-liquid two-phase cycle includes a gas storage tank 110, a compressor 111, an energy storage heat exchanger 112, a liquid storage tank 113, an evaporator 114, an energy release heat exchanger 115, and an expander 116 connected in sequence. The liquid storage tank 113 is used to store high-pressure liquid carbon dioxide, the gas storage tank 110 is used to store carbon dioxide at normal temperature and pressure, the compressor 111 is used to compress carbon dioxide, the energy storage heat exchanger 112 is used to cool carbon dioxide, the evaporator 114 and the energy release heat exchanger 115 are used to heat carbon dioxide, and the turbine is used to expand and do work with high-temperature and high-pressure carbon dioxide. Among them, the gas storage tank 110, the compressor 111, the energy storage heat exchanger 112, the liquid storage tank 113, the evaporator 114, the energy release heat exchanger 115, and the expander 116 can all refer to the existing patent CN112985145A, and their sequential connection can achieve the effect of traditional energy storage using energy.

[0033] The heat-required components in the energy storage system are equipment components that need heat to vaporize liquid carbon dioxide or heat gaseous carbon dioxide among all the components constituting the energy storage system, including but not limited to the evaporator 114 and the preheater 117. The heat exchange part 2101 can collect the heat of clinker, and the heat exchange part 2101 is connected to the heat-required components in the energy storage system to form a heat exchange to transfer the heat of the clinker to the heat-required components of the energy storage system.

[0034] Taking the energy storage technology based on the carbon dioxide gas-liquid two-phase cycle as an example for the specific implementation method, during the low electricity consumption period, the gaseous carbon dioxide at normal temperature and pressure in the gas storage tank 110 is compressed and condensed into liquid carbon dioxide by the compressor 111 and stored in the storage tank. Its compression heat is stored by the energy storage heat exchanger 112. During the high electricity consumption period, the evaporator 114 and the energy release heat exchanger 115 are used to absorb the stored thermal energy to heat the liquid carbon dioxide to a gaseous state. The gaseous carbon dioxide drives the turbine to drive the generator to generate electricity, and the gaseous carbon dioxide after doing work returns to the gas storage bin for recycling.

[0035] The specific production module process of industrial cement production is as follows: Cement production raw materials such as limestone, clay, and iron ore are crushed, pre-homogenized, proportioned by the batching station, and ground into raw meal. The cement raw meal is preheated and decomposed by the preheater in cement production and then enters the rotary kiln 216 for the firing of clinker. In the rotary kiln 216, the carbonate further decomposes rapidly and a series of solid-phase reactions occur to generate minerals in the cement clinker. After the clinker is fired, the temperature begins to decrease; subsequently, the high-temperature hot material discharged from the rotary kiln 216 is cooled by the cement clinker cooler 217 to the temperature that can be tolerated by the downstream conveying, storage bin, and cement machinery; the cooled cement clinker is put into the yard to cool naturally and then enters the clinker bin 210 for storage, and finally, a powder with appropriate fineness is prepared by a grinding machine.

[0036] The clinker storage silo 210 is a place for storing and managing the ore clinker (i.e., clinker) obtained by firing raw materials through in-furnace reactions during the cement production process. Clinker refers to the product after a series of high-temperature calcination reactions, where the ore composition changes to form the main components required for cement production, such as tricalcium aluminate (C3A), tetracalcium aluminoferrite (C4AF), dicalcium silicate (C2S), and tricalcium silicate (C3S), etc. The clinker storage silo can be located within the production workshop of a cement factory to store a large amount of ore clinker to meet the needs of cement production.

[0037] Among them, a heat exchange part 2101 is provided inside the clinker storage silo 210. The heat exchange part 2101 is a heat reserve that absorbs the heat of the clinker cement to achieve heat exchange. For example, it can be a conveying pipeline, a heat exchange device, a hood structure, a box structure, a shell structure, a heat conduction device, etc. It can also include a pipeline and a fan, or can be heat exchangers such as tube heat exchange, shell heat exchange, and barrel heat exchange. The heat exchange medium includes but is not limited to media such as water, heat-conducting oil, liquid metal, and air. This embodiment does not make any limitations in this regard.

[0038] By providing the heat exchange part 2101 in the clinker storage silo 210, the heat of the clinker is collected and sent to the energy storage system for heat exchange with the heat-requiring components of the energy storage system. By collecting the waste heat in the clinker stage of industrial cement production and transmitting the heat to the heat-requiring components of the energy storage system for use, not only is the heat recovery of the clinker realized, the thermal utilization rate of the cement process is improved, the environmental heat effect caused by the natural cooling of the cement clinker in the clinker storage silo 210 is reduced, a part of the heat that the energy storage system itself needs to heat is saved, but also the energy storage and power generation efficiency of the energy storage system is improved, generating a synergistic effect.

[0039] Please refer to Figure 1 , in one embodiment, the energy storage system 100 using waste heat provided by the present utility model further includes an evaporator 114. The heat exchange part 2101 is connected to the evaporator 114 to form heat exchange. The evaporator 114 is a device in the energy storage system used to evaporate the liquid carbon dioxide medium to achieve a phase change into carbon dioxide gas. The evaporator 114 follows the principle of evaporation absorbing heat. Its heat input is the large amount of heat of the clinker cement in industrial cement production. After the heat of the clinker cement in the clinker storage silo 210 is collected by the heat exchange part 2101, the heat is transmitted to the evaporator 114. Through the above technical means, the heat required by the evaporator 114 is replaced by the heat of the cement in the clinker storage silo 210, not only effectively utilizing the waste heat of the clinker cement in industrial cement production, but also improving the efficiency of the carbon dioxide energy storage system.

[0040] Please refer to Figure 1, in one embodiment, the energy storage system 100 utilizing waste heat provided by the present utility model further includes a preheater 117, which is connected between the gas storage tank 110 and the compressor 111, and the preheater 117 is connected to the heat exchange part 2101 of the clinker silo 210 to form a heat exchange.

[0041] The preheater 117 is a device for preheating gaseous carbon dioxide before it is compressed and does work by the compressor 111 in the energy storage system. Its heat comes from the heat of the cement clinker collected by the heat exchange part 2101 of the clinker silo 210 in industrial cement production. By setting the preheater 117 and connecting it to the heat exchange part 2101 of the clinker silo 210, the efficiency of the energy storage system is further improved, and the waste heat generated by the clinker in industrial cement production is effectively utilized.

[0042] Please refer to Figures 1 to 3 , in one embodiment, the heat exchange part 2101 of the energy storage system 100 utilizing waste heat provided by the present utility model includes heat exchange tubes 21011. The heat exchange tubes 21011 are elements for heat exchange between two media, having high thermal conductivity and good isothermal property, capable of quickly transferring heat energy from one point to another without heat loss. Besides being tubular, the heat exchange tubes 21011 can also adopt various enhanced heat transfer tubes, such as finned tubes, threaded tubes, spiral groove tubes, etc. This embodiment does not make any limitation. The heat exchange media include but are not limited to media such as water, heat transfer oil, liquid metal, air, etc., and this embodiment does not make any limitation to this.

[0043] The heat exchange tubes 21011 can be arranged in various forms in the clinker silo 210. Preferably, the heat exchange tubes 21011 are arranged in the upper part and the circumferential part of the clinker silo 210 to collect the heat of the clinker. In addition, the heat exchange tubes 21011 can be arranged only in the upper part or the circumferential part of the clinker silo 210 to collect the heat of the clinker, and this embodiment does not make any limitation.

[0044] Preferably, the heat exchange tubes 21011 are connected to the evaporator 114 and the heat exchanger to form a heat exchange. In addition, the heat exchange tubes 21011 can be connected only to the evaporator 114 or the heat exchanger to form a heat exchange, and this embodiment does not make any limitation.

[0045] Through the above technical solutions, the maximization of the heat exchange effect is achieved, and the waste heat of the cement clinker silo 210 is effectively absorbed.

[0046] Please refer to Figure 2, in one embodiment, the energy storage system 100 utilizing waste heat provided by the present utility model further includes a heat storage tank 118. The heat storage tank 118 is connected between the heat exchange section 2101 and the evaporator 114 to store the waste heat of the cement in the clinker storage bin 210; or; the heat storage tank 118 can also be arranged between the heat exchange section 2101 and the preheater 117 to store the waste heat. The heat storage tank 118 is a device for heat storage, which can have various forms. It is well-known to those skilled in the art to apply various forms of heat storage tanks 118. It can include a set of heat storage tanks 118 or multiple groups of heat storage tanks 118. The heat storage medium includes but is not limited to media such as water, heat-conducting oil, liquid metal, air, etc. This embodiment does not make any limitation thereto.

[0047] Through the above technical solution, the storage of waste heat is made more flexible, enabling adaptation to cement production, that is, the waste heat of the cement in the clinker storage bin 210 can be stored irregularly, greatly improving the utilization efficiency of the waste heat.

[0048] Please refer to Figure 3 , in one embodiment, the energy storage system 100 utilizing waste heat provided by the present utility model further includes an industrial cement production module 200. The industrial cement production module 200 further includes a grinding mill 211, a conveyor 212, and a fluidized bed 213. The conveyor 212 is connected between the grinding mill 211 and the heat exchange bed to serve as a conveyor. The grinding mill 211 can grind and convey the cement in the clinker storage bin 210 to the fluidized bed 213. The fluidized bed 213 can collect the heat of the cement and be connected to the evaporator 114 and / or the preheater 117 through pipes to form a heat exchange.

[0049] The grinding mill 211 is a device for grinding cement clinker and other materials. It grinds and mixes the materials by applying pressure and friction. For example, the grinding mill 211 can consist of a rotating grinding disk and a fixed grinding roller. The material is placed between the two, and through the pressure of the grinding roller and the rotational friction of the grinding disk, the material is ground into a fine powder.

[0050] The conveyor 212 is a device for transporting cement and other materials from one location to another. Taking this embodiment as an example, the conveyor 212 transports the ground powdered cement to the fluidized bed 213. The conveyor 212 is composed of a belt conveyor and a driving device, for example. The conveyor belt can be arranged horizontally or inclined, and can be adjusted as needed. The conveyor 212 can select different types of conveyor belts, such as rubber belts, polyester belts, etc., according to the requirements of the work site.

[0051] The fluidized bed 213 is a heat energy recovery device that places cement clinker in the fluidized bed 213 and utilizes the heat transfer between high-temperature flue gas and solid particles to recover heat energy and convert it into useful heat. The particulate material in the fluidized bed 213 presents a fluidized state under the action of the airflow, enabling the effective transfer of heat energy to the material.

[0052] After the cement in the clinker silo 210 is ground into lumps or powders by the grinding mill 211, the conveyor 212 is used to convey the lumpy or powdered cement into the fluidized bed 213. The fluidized bed 213 is provided with a heat exchange tube 21011 channel. The heat exchange tube 21011 channel collects heat and transfers it to the evaporator 114 or the preheater 117 of the energy storage system to utilize this part of the waste heat. Of course, if enough heat is collected, it can also be transferred into the evaporator 114 and the preheater 117 of the energy storage system to evaporate and preheat the energy storage medium.

[0053] Through the above technical solutions, not only the characteristics of high efficiency, energy conservation, and environmental protection in cement production are realized, but also the energy consumption and emissions in the cement production process can be effectively reduced, the energy utilization efficiency in the cement production process is improved, the production efficiency is greatly increased, the labor cost is reduced, and the work safety is improved.

[0054] Please refer to Figure 3 In one embodiment, the energy storage system 100 using waste heat provided by the present utility model further includes an industrial cement production module 200. The industrial cement production module 200 further includes a separator 214. The separator 214 is disposed on the pipeline connecting the fluidized bed 213 and the evaporator 114 and / or the preheater 117 to separate cement particles.

[0055] The separator 214 is a device for separating and classifying particulate materials in cement clinker according to particle size. For example, it can be a classifier or a sorter, both of which can play a separation role. The separator 214 usually consists of a rotating separation cylinder and an air flow system. When the cement clinker passes through the separator 214, according to the particle size and gravity, the larger particles will be separated to the outside of the cylinder wall, and the smaller particles will be carried to the outlet of the separator 214. At the same time, by adjusting the parameters of the air flow system, such as wind speed and air volume, the separation effect of the particles can be controlled. The separator 214 is disposed on the pipeline connecting the fluidized bed 213 and the evaporator 114 / or the preheater 117 in the cement production line to separate and collect the fine powder generated by the mill, and the separated fine powder can also be reused.

[0056] Through the above technical solutions, it prevents cement powder from entering the heat exchange tube 21011 channel to cause pollution, can reuse the cement fine powder, improves the grinding efficiency in the cement production process, and reduces energy consumption and environmental pollution at the same time.

[0057] Please refer to Figure 3, in one embodiment, the energy storage system 100 utilizing waste heat provided by the present utility model further includes a grinding machine 211. The grinding machine 211 includes, but is not limited to, a roller press and a powder mill. The roller press and the powder mill are connected to each other and can grind cement to obtain finished powdered cement.

[0058] Through the above technical solution, the cement grinding efficiency can be greatly improved, and the heat of the cement waste heat can be dissipated faster.

[0059] Please refer to Figure 3 , in one embodiment, the energy storage system 100 utilizing waste heat provided by the present utility model further includes a conveyor 212. The conveyor 212 may include, for example, a conveyor belt and a throwing feeder. The conveyor belt and the throwing feeder are connected to each other. Both the conveyor belt and the throwing feeder are well-known devices to those of ordinary skill in the art. The conveyor belt and the throwing feeder are both connected between the grinding machine 211 and the heat exchange bed to play a conveying role.

[0060] Through the above technical solution, the conveying efficiency is greatly improved, so that the heat of the cement clinker will not be dissipated too fast.

[0061] Please refer to Figure 4 , in one embodiment, the energy storage system 100 utilizing waste heat provided by the present utility model further includes a heat storage tank 118. The heat storage tank 118 is connected between the fluidized bed 213 and the evaporator 114 to store heat; or; the heat storage tank 118 is connected between the fluidized bed 213 and the preheater 117 to store heat; or; the heat storage tank 118 is connected between the fluidized bed 213 and the evaporator 114 and between the fluidized bed 213 and the preheater 117.

[0062] The heat storage tank 118 is a device for heat storage. It can have various forms. It is well-known to those skilled in the art to apply various forms of heat storage tanks 118. It can include a set of heat storage tanks 118 or multiple groups of heat storage tanks 118. The heat storage medium includes, but is not limited to, media such as water, heat-conducting oil, liquid metal, air, etc. This embodiment does not make any limitation on this.

[0063] Through the above technical solution, the storage of waste heat is more flexible, making it adaptable to cement production, that is, the waste heat of the cement clinker storage 210 can be stored at an indefinite time, greatly improving the utilization efficiency of the waste heat.

[0064] Please refer to Figure 5 , one of the embodiment solutions provided by the present utility model is: a solution for providing the heat required for preheating and evaporation for the compressed carbon dioxide energy storage system by using the waste heat recovery system of the cement clinker storage 210.

[0065] (1) The working process of the waste heat recovery system of the cement clinker storage 210 is as follows:

[0066] Step 1, Preparation and homogenization of cement raw meal: After mining and crushing cement raw materials such as limestone raw materials, argillaceous raw materials, and a small amount of corrective raw materials, they are ground and mixed in a certain proportion through the raw material batching station to form raw meal with appropriate composition and uniform quality, which is stored in the raw meal homogenization silo;

[0067] Step 2, Preheating and decomposition: The cement raw meal enters the cement preheater 215, and after being fully mixed with the waste gas discharged from the rotary kiln 216 and the decomposition furnace, the raw meal is preheated and partially decomposed by heating the raw meal with waste heat;

[0068] Step 3, Clinker calcination and cooling: The clinker after preheating and pre-decomposition is further heated in the rotary kiln 216. During the heating process of the raw meal in the rotary kiln 216, physical and chemical reactions such as drying, dehydration, carbonate decomposition, solid-phase reaction, and clinker sintering occur in sequence. After the material temperature rises, the carbonate rapidly decomposes and a series of solid-phase reactions occur to generate cement clinker;

[0069] Step 4, Clinker cooling: The cement clinker is cooled by the action of the clinker cooler 217. The high-temperature clinker contacts the cold air, and after transferring the heat to the air, its own temperature drops to 120 - 180 °C;

[0070] Step 5: The cement clinker at 120 - 180 °C enters from the upper part of the clinker silo 210 and exchanges heat with the heat exchange medium in the clinker silo 210 and then cools down. The heat exchange medium (such as water, heat-conducting oil, liquid metal, etc.) is heated and then enters the heat storage tank 118 for storage, and is put into use when the energy storage system operates for heat supply;

[0071] Step 6, Clinker roll pressing and grinding: The cement clinker in the cooled clinker silo 210 is processed by a roller press and a grinding mill to achieve crushing, grinding, powder selection, and uniformity of the cement raw materials, and after grinding and classification, it is stored in the cement silo 218.

[0072] (2) The working process of the compressed carbon dioxide energy storage system using the waste heat of the cement clinker silo 210 is as follows:

[0073] During energy storage, the heat transfer medium in the heat storage tank 118 is used as the heat source for the cement preheater 215 during the energy storage stage, providing the heat required for preheating the normal-temperature carbon dioxide gas in the gas storage reservoir 110. The normal-temperature carbon dioxide gas in the gas storage reservoir 110 enters the cement preheater 215 through the cold fluid inlet of the cement preheater 215, exchanges heat with the heat transfer medium (such as water, heat-conducting oil, liquid metal, etc.) from the heat storage tank 118 to complete the preheating of the carbon dioxide gas. After heat exchange, the heat transfer medium returns to the cement clinker storage 210 for heat storage again; Subsequently, the preheated carbon dioxide gas is compressed into high-temperature and high-pressure carbon dioxide by the compressor 111 driven by electricity, converting electrical energy into the pressure energy and internal energy of carbon dioxide; Further, the high-temperature and high-pressure carbon dioxide gas at the outlet of the compressor 111 is cooled and transformed into high-pressure liquid carbon dioxide through the energy storage heat exchanger 112 and stored in the liquid storage tank 113.

[0074] During energy release, the heat transfer medium in the heat storage tank 118 is used as the heat source for the evaporator 114 during the energy release stage, providing the heat required for evaporation of the high-pressure liquid carbon dioxide in the liquid storage tank 113. The high-pressure liquid carbon dioxide in the liquid storage tank 113 enters through the cold fluid inlet of the evaporator 114 and exchanges heat with the heat transfer medium (such as water, heat-conducting oil, liquid metal, etc.) from the heat storage tank 118 in the evaporator 114 to be gasified into high-pressure gaseous carbon dioxide. The heat transfer medium after heat exchange at the outlet of the evaporator 114 returns to the cement clinker storage 210 for heat storage again; Subsequently, the high-pressure gaseous carbon dioxide is heated to high temperature and high pressure by the heat storage working medium in the system or the available heat source outside the system through the energy release heat exchanger 115, drives the expander 116 to do work and generate electricity, and finally returns to the gas storage reservoir 110 for storage, waiting to be used in the next system operation.

[0075] Please refer to Figure 6 , Another embodiment provided by the present utility model is: After the cement clinker is ground and cooled by the fluidized bed 213, the hot air obtained provides the heat required for preheating and evaporation for the compressed carbon dioxide energy storage system. (This solution uses hot air to directly heat carbon dioxide)

[0076] (1) The working process of the fluidized heat recovery system after the cement clinker in the cement clinker storage 210 is ground is as follows:

[0077] The first step, cement raw material preparation and homogenization: Cement raw materials such as limestone raw materials, clay raw materials and a small amount of corrective raw materials are mined, crushed, and then ground and mixed in appropriate proportions by the raw material batching station to form raw materials with appropriate composition and uniform quality, which are stored in the raw material homogenization storage;

[0078] The second step, preheating and decomposition: The cement raw materials enter the cement preheater 215, are fully mixed with the waste gas discharged from the rotary kiln 216 and the decomposition furnace, and the raw materials are preheated and partially carbonate decomposed by heating the raw materials with waste heat;

[0079] Step 3: Clinker calcination and cooling: Part of the clinker after budgeting and pre-calcination is heated in the rotary kiln 216. During the heating process of the raw meal in the rotary kiln 216, physical and chemical reactions such as drying, dehydration, carbonate decomposition, solid-phase reaction, and clinker sintering occur in sequence. After the material temperature rises, the carbonate decomposes rapidly, and a series of solid-phase reactions occur to produce cement clinker.

[0080] Step 4: Clinker cooling: The cement clinker is affected by the clinker cooler 217. The high-temperature clinker contacts with cold air, transfers heat to the air, and its own temperature drops to 120 - 180 °C.

[0081] Step 5: The cement clinker at 120 - 180 °C enters the clinker storage silo 210 for storage.

[0082] Step 6: The clinker is roll-pressed and ground, and then enters the fluidized bed 213 for cooling: The cement clinker in the clinker storage silo 210 is processed by a roller press and a grinding mill to achieve crushing and grinding of the cement raw materials. Then, the cement powder at 120 - 180 °C is transported to the throwing feeder by a conveyor, and then evenly thrown into the fluidized bed 213. The previously filtered air enters from the bottom of the fluidized bed 213, is evenly distributed through the sieve plate, and fully contacts with the cement powder to be heated. The cooled cement material leaves through the reserved port. The clinker-containing air after heat exchange enters the separator 214 from the top. After multiple gas-solid two-phase separations, the cement powder entrained in the upward airflow is separated and discharged. After classification, it is stored in the cement storage silo 218. Moreover, the clinker-containing air after heat exchange provides the heat required for preheating and evaporation for the compressed carbon dioxide energy storage system.

[0083] (2) The working process of the compressed carbon dioxide energy storage system using the waste heat of the cement clinker storage silo 210 is as follows:

[0084] During energy storage, the hot air at the outlet of the fluidized bed 213 is used as the heat source of the cement preheater 215 during the energy storage stage to provide the heat required for preheating the normal-temperature carbon dioxide gas in the gas storage tank 110. The normal-temperature carbon dioxide gas in the gas storage tank 110 enters the cement preheater 215 through the cold fluid inlet of the cement preheater 215, exchanges heat with the hot air from the outlet of the fluidized bed 213 to complete the preheating of the carbon dioxide gas, and the exchanged air is directly discharged; Subsequently, the preheated carbon dioxide gas is compressed into high-temperature and high-pressure carbon dioxide by the compressor 111 driven by electricity, converting electrical energy into the pressure energy and internal energy of carbon dioxide; Further, the high-temperature and high-pressure carbon dioxide gas at the outlet of the compressor 111 is cooled and transformed into high-pressure liquid carbon dioxide through the energy storage heat exchanger 112 and stored in the liquid storage tank 113.

[0085] During energy release, the hot air at the outlet of the fluidized bed 213 is used as the heat source for the evaporator 114 in the energy release stage, providing the heat required for the evaporation of the high-pressure liquid carbon dioxide in the liquid storage tank 113. The high-pressure liquid carbon dioxide in the liquid storage tank 113 enters through the cold fluid inlet of the evaporator 114, exchanges heat with the hot air from the outlet of the fluidized bed 213 in the evaporator 114, and is vaporized into high-pressure gaseous carbon dioxide. The air after heat exchange at the outlet of the evaporator 114 is directly discharged; subsequently, the high-pressure gaseous carbon dioxide is heated to high temperature and high pressure by the heat storage working medium in the system or the available heat source outside the system through the energy release heat exchanger 115, drives the expander 116 to do work and generate electricity, and finally returns to the gas storage reservoir 110 for storage, waiting to be used in the next system operation.

[0086] Please refer to Figure 7 , another embodiment provided by the present utility model is: after the cement clinker is ground and cooled by the fluidized bed 213, the obtained hot air provides the heat required for preheating and evaporation for the compressed carbon dioxide energy storage system. (In this method, after the hot air exchanges heat indirectly with the heat exchange medium, water, the heat exchange medium is used to supply heat to the energy storage system)

[0087] (1) The working process of the fluidized bed heat recovery system after the cement clinker in the cement clinker silo 210 is ground is as follows:

[0088] The first step, cement raw material preparation and homogenization: After the cement raw materials such as limestone raw materials, clay raw materials and a small amount of corrective raw materials are mined and crushed, they are ground and mixed in a certain proportion through the raw material batching station to form raw materials with appropriate composition and uniform quality, and are stored in the raw material homogenization silo;

[0089] The second step, preheating and decomposition: The cement raw materials enter the cement preheater 215, and after being fully mixed with the waste gas discharged from the rotary kiln 216 and the decomposition furnace, the raw materials are preheated and partially carbonate decomposed by the method of heating the raw materials with waste heat;

[0090] The third step, clinker calcination and cooling: The clinker after pre-budget and pre-decomposition is further heated in the rotary kiln 216. During the heating process of the raw materials in the rotary kiln 216, physical and chemical reactions such as drying, dehydration, carbonate decomposition, solid-phase reaction and clinker sintering occur in sequence. After the material temperature rises, the carbonate decomposes rapidly and a series of solid-phase reactions occur, generating cement clinker;

[0091] The fourth step, clinker cooling: The cement clinker is affected by the clinker cooler 217. The high-temperature clinker contacts the cold air, transfers the heat to the air, and its own temperature drops to 120 - 180 °C;

[0092] The fifth step: The cement clinker at 120 - 180 °C enters the clinker silo 210 for storage;

[0093] Step 6: After the clinker is roll-pressed and ground, it enters the fluidized bed 213 for cooling: The cement clinker in the clinker silo 210 is processed by a roll press and a grinding mill to achieve crushing and grinding of the cement raw materials. Then, the cement powder at 120 - 180 °C is transported to the throwing feeder by a conveyor and then evenly thrown into the fluidized bed 213. The filtered air enters from the bottom of the fluidized bed 213, is evenly distributed through the sieve plate, and fully contacts the cement powder and is heated. The cooled cement material leaves through the reserved port. The clinker-containing air after heat exchange enters the separator 214 from the top. After multiple gas-solid two-phase separations, the cement powder entrained in the clinker-containing air is separated and discharged. After classification, it is stored in the cement silo 218. Moreover, after the clinker-containing air after heat exchange exchanges heat with a heat exchange medium (such as water, heat-conducting oil, liquid metal, etc.), it is heated to a high-temperature working medium and stored in the heat storage tank 118. The heat exchange medium in the heat storage tank 118 provides the heat required for preheating and evaporation for the compressed carbon dioxide energy storage system.

[0094] (2) The working process of the compressed carbon dioxide energy storage system using the waste heat of the cement clinker silo 210 is as follows:

[0095] During energy storage, the heat exchange medium in the heat storage tank 118 is used as the heat source of the cement preheater 215 during the energy storage stage to provide the heat required for preheating the normal-temperature carbon dioxide gas in the gas storage tank 110. The normal-temperature carbon dioxide gas in the gas storage tank 110 enters the cement preheater 215 through the cold fluid inlet of the cement preheater 215, exchanges heat with the heat exchange medium (such as water, heat-conducting oil, liquid metal, etc.) from the heat storage tank 118 to complete the preheating of the carbon dioxide gas, and the heat exchange medium after heat exchange returns to the cement clinker silo 210 for heat storage again; Subsequently, an electric-driven compressor 111 is used to compress the preheated carbon dioxide gas into high-temperature and high-pressure carbon dioxide, converting electrical energy into the pressure energy and internal energy of carbon dioxide; Further, the high-temperature and high-pressure carbon dioxide gas at the outlet of the compressor 111 is cooled and transformed into high-pressure liquid carbon dioxide through the energy storage heat exchanger 112 and stored in the liquid storage tank 113.

[0096] During energy release, the heat exchange medium in the heat storage tank 118 is used as the heat source of the evaporator 114 during the energy release stage to provide the heat required for evaporation of the high-pressure liquid carbon dioxide in the liquid storage tank 113. The high-pressure liquid carbon dioxide in the liquid storage tank 113 enters through the cold fluid inlet of the evaporator 114 and exchanges heat with the heat exchange medium (such as water, heat-conducting oil, liquid metal, etc.) from the heat storage tank 118 in the evaporator 114 to be gasified into high-pressure gaseous carbon dioxide. The heat exchange medium after heat exchange at the outlet of the evaporator 114 returns to the cement clinker silo 210 for heat storage again; Subsequently, the high-pressure gaseous carbon dioxide is heated to high temperature and high pressure by the heat storage working medium in the system or the available heat source outside the system through the energy release heat exchanger 115, drives the expander 116 to do work and generate electricity, and finally returns to the gas storage tank 110 for storage and awaits the next system operation.

[0097] The beneficial effects brought about by adopting one of the above embodiments are:

[0098] 1. Realize clinker heat recovery, improve the heat utilization rate of cement process, and reduce the environmental thermal effect caused by natural cooling of cement clinker in the clinker silo 210.

[0099] Second, the temperature of the cement clinker in the cement clinker silo 210 is effectively reduced, so as to avoid fatigue damage to the conveying, crushing, rolling and other equipments due to the high temperature of the cement clinker, thereby extending the service life of the equipment and improving the economic efficiency.

[0100] 3. It avoids the phenomenon of cement balls, lining plates and grate plates getting stuck inside the cement mill due to the high temperature of cement clinker during the subsequent cement roller pressing and grinding process, thereby reducing the problem of reduced cement production and equipment operation, repair and maintenance costs caused by this phenomenon.

[0101] Fourth, the separation efficiency is higher when the fluidized bed 213 is used. After the clinker is cooled in the fluidized bed 213, the air flow carries the materials of different sizes and enters one or more separators 214 to achieve cement powder classification.

[0102] 5. The waste heat of cement clinker is effectively utilized to supply the heat-consuming equipment of the energy storage system, so that the two produce a synergistic effect, which not only fully utilizes the waste heat emitted by cement clinker, but also improves the efficiency of the energy storage system.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat storage system utilizing waste heat, characterized in that: It includes a gas storage reservoir, a compressor, an energy storage heat exchanger, a liquid storage tank, an evaporator, an energy release heat exchanger, and an expander connected in sequence. The waste heat utilization energy storage system further includes an industrial cement production module, where: The industrial cement production module includes a clinker storage tank, and the clinker storage tank is provided with a heat exchange part. The heat exchange part can collect the heat of the clinker, and the heat exchange part is connected to the heat demand components in the energy storage system to form a heat exchange.

2. The energy storage system using waste heat according to claim 1, wherein: The heat demand components of the waste heat utilization energy storage system include an evaporator, and the heat exchange part is connected to the evaporator to form a heat exchange.

3. The energy storage system using waste heat according to claim 1, wherein: The heat demand components of the waste heat utilization energy storage system further include a preheater. The preheater is connected between the gas storage reservoir and the compressor, and the preheater is connected to the heat exchange part of the clinker storage tank to form a heat exchange.

4. The energy storage system using waste heat according to any one of claims 1-3, characterized in that: The heat exchange part includes heat exchange tubes. The heat exchange tubes are arranged on the upper part and / or the peripheral part of the clinker storage tank to collect the heat of the clinker, and the heat exchange tubes are connected to the evaporator and / or the preheater to form a heat exchange.

5. The energy storage system using waste heat according to claim 4, wherein: The waste heat utilization energy storage system further includes a heat storage tank. The heat storage tank is connected between the heat exchange part and the evaporator to store heat; or; The heat storage tank is connected between the heat exchange part and the preheater to store heat.

6. The energy storage system using waste heat according to claim 3, characterized in that: The industrial cement production module further includes a grinding mill, a conveyor, and a fluidized bed. The conveyor is connected between the grinding mill and the heat exchange bed to play a conveying role. The grinding mill can grind and convey the cement in the clinker storage tank to the fluidized bed. The fluidized bed can collect the heat of the cement and is connected to the evaporator and / or the preheater through a pipeline to form a heat exchange.

7. The energy storage system using waste heat according to claim 6, wherein: The industrial cement production module further includes a separator. The separator is arranged on the pipeline connecting the fluidized bed and the evaporator / or the preheater to separate cement particles.

8. The energy storage system using waste heat according to claim 6, characterized in that: The grinding mill includes a roller press and a powder mill. The roller press and the powder mill are connected to each other and can grind the cement to obtain finished powder cement.

9. The energy storage system using waste heat according to claim 6, wherein: The conveyor includes a conveyor belt and a throwing feeder. The conveyor belt and the throwing feeder are connected to each other, and both the conveyor belt and the throwing feeder are connected between the grinding mill and the heat exchange bed to play a conveying role.

10. The energy storage system using waste heat according to any one of claims 6-9, characterized in that: The waste heat utilization energy storage system further includes a heat storage tank. The heat storage tank is connected between the fluidized bed and the evaporator to store heat; and / or; The heat storage tank is connected between the fluidized bed and the preheater to store heat.

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