A system and method for processing heavy caustic soda by coupling wind power with flexible load power supply
By using a wind power coupled with a flexible load power supply system, and by converting wind power into stable steam using an electric thermal storage device, combined with stripping decomposition and multi-effect evaporation processes, the problems of high energy consumption and large carbon emissions in natural alkali processing plants have been solved, achieving low-carbon and stable production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAOHE GASOLINEEUM EXPLORATION BUREAU CO LTD
- Filing Date
- 2024-11-28
- Publication Date
- 2026-05-29
AI Technical Summary
Existing natural alkali processing plants are energy-intensive and have high carbon emissions, making it difficult to directly utilize unstable wind power.
A wind power coupled flexible load power supply system is adopted, which converts wind power into stable steam supply to the natural alkali processing plant through an electric thermal storage device. Combined with stripping decomposition and multi-effect evaporation processes, stable production is achieved.
The natural alkali processing plant has achieved low carbon emissions, and the wind power supply method has achieved zero carbon dioxide emissions, ensuring a stable power supply to meet processing needs.
Smart Images
Figure CN122106824A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of natural soda ash production technology, and in particular to a system and method for processing heavy soda ash using wind power coupled with flexible loads. Background Technology
[0002] Natural soda ash processing employs the evaporation method, with the evaporator as the core technology. Steam-powered heat is used to evaporate and concentrate the natural soda ash brine. When the brine concentration is greater than or equal to the sodium carbonate solubility, sodium carbonate crystals precipitate. After calcination, drying, and cooling, it becomes industrial soda ash, which is then packaged and sold. Currently, the Anpeng natural soda ash processing plant in China uses four-effect and five-effect evaporators, while the Tamusu natural soda ash processing plant uses multi-effect evaporators and MVR (Multi-Release Vaporizer). Natural soda ash processing plants are energy-intensive enterprises, primarily due to the steam demand of the soda ash processing technology, with a smaller portion of energy consumption coming from the electricity demand of the processing equipment. Statistics show that the comprehensive energy consumption per ton of soda ash is 335 kgce / ton. Currently, large-scale natural soda ash processing plants both domestically and internationally utilize coal-fired combined heat and power (CHP) technology to provide steam and electricity, such as the Kazan natural soda ash processing project in Turkey and the Tamusu natural soda ash processing project in China.
[0003] The natural alkali processing project uses a coal-fired combined heat and power (CHP) system. Its carbon emissions per unit of soda ash production are approximately 0.91 tons of CO2-eq / ton of alkali. Using a coal-fired CHP system is insufficient to address carbon emission reduction. Wind power generation works by using wind energy to drive generators, converting mechanical energy into electrical energy. Its advantage is that wind power is green electricity with zero carbon emissions. However, due to the instability of wind energy, the generated wind power is unreliable. For a natural alkali processing plant to operate stably, a stable energy supply is required, making it difficult to directly use wind power to power the plant.
[0004] Therefore, there is a need in the existing technology to improve the method of processing heavy soda ash by using wind power coupled with flexible loads. Summary of the Invention
[0005] In view of this, the purpose of this invention is to propose a system and method for processing heavy soda ash using wind power coupled with flexible loads. In response to the problems of high energy consumption and carbon emissions in existing large-scale natural soda ash processing projects, this invention achieves carbon emission reduction in natural soda ash processing plants by developing a new low-carbon wind power and steam coupling energy supply method and integrating it with the matching natural soda ash processing technology.
[0006] To achieve the above objectives, embodiments of the present invention provide a system for processing heavy soda ash using wind power coupled with flexible loads, comprising: Wind power generation equipment is used to capture wind power and convert it into electrical energy. An electric thermal storage device, comprising a water storage module and a thermal storage module, is used to obtain electrical energy to convert water in the water storage module into water vapor and store it in the thermal storage module. The heavy soda ash production system obtains steam from the electric thermal storage device to power the equipment within the system.
[0007] In some implementations, the heavy soda ash production system obtains electrical energy from a wind power generation unit to power the electrical equipment within the system.
[0008] In some implementations, the heavy soda ash production system includes a pretreatment module, a decomposition module, a crystallization module, and a post-treatment module. The pretreatment module is used for brine sedimentation, filtration, and impurity adsorption; The decomposition module is used to decompose sodium bicarbonate in the brine into sodium carbonate and concentrate the brine. The crystallization module is used to further evaporate and concentrate the concentrated brine to obtain brine. The post-processing module is used to centrifuge, dry, and calcine the brine to obtain heavy soda ash products; The pretreatment and posttreatment modules use electrical energy from the wind power generation device, while the decomposition, crystallization, and posttreatment modules use water vapor from the electric thermal storage device.
[0009] In some embodiments, the pretreatment module includes a brine settling machine, a multi-media filter, and a multi-stage activated carbon adsorption device to remove impurities and refine the brine. The brine settling machine and the multi-media filter are connected by an auxiliary pump, which is powered by electricity generated by a wind power generator.
[0010] In some embodiments, the decomposition module includes a primary stripping decomposition tower and a secondary stripping decomposition tower, both of which are connected to an electric thermal storage device to receive steam from the electric thermal storage device to decompose and concentrate the brine.
[0011] In some embodiments, the crystallization module includes multiple multi-effect evaporators connected in series, such that the next-stage multi-effect evaporator obtains secondary steam from the previous-stage multi-effect evaporator for evaporation and crystallization, and each multi-effect evaporator is connected to an electric thermal storage device to receive water vapor from the electric thermal storage device for evaporation and crystallization of the brine.
[0012] In some embodiments, the post-processing module includes a centrifugal dryer and a fluidized bed calcination device. The centrifugal dryer is connected to an electric thermal storage device to receive steam from the electric thermal storage device to dry the brine at high temperature. The fluidized bed calcination device is powered by electricity from a wind power generation device to calcine the brine.
[0013] In some implementations, the heat storage module is a heat container with an insulation material layer, and the heat container stores high-temperature water vapor for 0 to 24 hours.
[0014] In some embodiments, the thermal insulation layer includes an alumina ceramic layer or a silicon carbide ceramic layer.
[0015] In some implementations, the maximum heat storage temperature of the heat container is 400~650°C.
[0016] In some implementations, the wind power generation device is also connected to an uplink circuit to upload excess electrical energy to the power grid.
[0017] In another aspect, the present invention provides a method for processing heavy soda ash using wind power coupled with flexible loads, comprising the following steps: S1 continuously acquires wind power and converts it into electricity; S2 uses electricity to heat water and convert it into steam. Some of the steam is directly transported to the heavy soda ash production system for brine processing, while the excess steam is stored for later use.
[0018] In some implementations, it also includes: The electricity is directly supplied to the electrical equipment in the heavy soda ash production system.
[0019] In some implementations, a portion of the steam is directly supplied to the heavy soda ash production system to process the brine, including: Some of the steam is directly supplied to the decomposition module within the heavy soda ash production system to decompose and concentrate the brine. Some of the steam is directly supplied to the crystallization module within the heavy soda ash production system to evaporate and crystallize the brine. Some of the steam is directly supplied to the post-processing module in the heavy soda ash production system to dry the brine at high temperature.
[0020] In some implementations, a portion of the steam is directly supplied to the decomposition module within the heavy soda ash production system to decompose and concentrate the brine, including: Some of the steam is directly supplied to the primary and secondary stripping decomposition towers of the decomposition module to decompose and concentrate the brine.
[0021] In some implementations, a portion of the steam is directly supplied to the crystallization module within the heavy soda ash production system to evaporate and crystallize the brine, including: Some of the water vapor is directly supplied to multiple multi-effect evaporators connected in series in the crystallization module to evaporate and crystallize the brine.
[0022] In some implementations, a portion of the steam is directly supplied to the post-processing module within the heavy soda ash production system for high-temperature drying of the brine, including: Some of the steam is directly supplied to the centrifugal dryer of the post-processing module to dry the brine at high temperature.
[0023] In some implementations, electrical energy is directly supplied to the electrical equipment within the heavy soda ash production system, including: The electricity is directly supplied to the booster pump of the pretreatment module in the heavy soda ash production system.
[0024] In some implementations, directly supplying electrical energy to the electrical equipment within the heavy soda ash production system includes: The electrical energy is directly supplied to the fluidized bed calcination unit of the post-processing module within the heavy soda ash production system.
[0025] In some implementations, the method also includes uploading excess electrical energy to the power grid.
[0026] The present invention has at least the following beneficial technical effects: This invention aims to propose a system and method for processing heavy soda ash using wind power coupled with flexible loads. The energy consumption of the heavy soda ash production system is provided by wind power, which heats water to produce steam. Conventional electric heating is a rigid load and is difficult to use with unstable wind power. Therefore, this invention proposes to use an electric thermal storage device to generate steam. The electric thermal storage device can convert unstable wind power into thermal energy for storage, which is a flexible load. Wind power coupled with electric thermal storage can use unstable wind power to generate stable steam for stable production in natural soda ash processing plants. Compared with conventional coal-fired cogeneration, wind power can achieve zero carbon dioxide emissions. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of an embodiment of the system for processing heavy soda ash using wind power coupled with flexible loads provided by the present invention; Figure 2 This is a schematic diagram of an embodiment of the heavy soda ash processing flow provided by the present invention.
[0029] Explanation of reference numerals in the attached figures: 100. Wind power generation equipment; 200. Electric thermal storage equipment; 300. Heavy soda ash production system; 310. Preprocessing module; 320. Decomposition module; 330. Crystallization module; 340. Postprocessing module; 311. Brine settling machine; 312. Booster pump; 313. Multi-media filter; 314. Primary activated carbon adsorption tank; 315. Secondary activated carbon adsorption tank; 321. Primary stripping decomposition tower; 322. Secondary stripping decomposition tower; 331. Primary multi-effect evaporator; 332. Secondary multi-effect evaporator; 341. Centrifugal dryer; 342. Fluidized bed calcination device. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.
[0031] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.
[0032] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.
[0033] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0034] Existing large-scale natural alkali processing projects are energy-intensive, mainly relying on coal-fired combined heat and power (CHP) processes, resulting in significant carbon emissions. The purpose of this invention is to develop new low-carbon energy supply methods and integrate them with matching natural alkali processing technologies to achieve carbon emission reduction in natural alkali processing plants. Figure 1 The diagram shown is a schematic representation of an embodiment of the system for processing heavy soda ash using wind power coupled with flexible loads provided by the present invention, including: Wind power generation device 100, which is used to obtain wind power and convert it into electrical energy; The electric thermal energy storage device 200 includes a water storage module and a thermal energy storage module. The electric thermal energy storage device 200 is used to obtain electrical energy to convert the water in the water storage module into water vapor and store it in the thermal energy storage module. The heavy soda ash production system 300 selectively obtains electrical energy from a wind power generation unit to power the pumps within the system, and selectively obtains water vapor from an electric thermal storage unit to power the equipment within the system.
[0035] Furthermore, the heavy soda ash production system 300 includes a pretreatment module 310, a decomposition module 320, a crystallization module 330, and a post-treatment module 340. Pretreatment module 310 is used for brine sedimentation, filtration, and impurity adsorption; The decomposition module 320 is used to decompose sodium bicarbonate in the brine into sodium carbonate and concentrate the brine. Crystallization module 330 is used to further evaporate and concentrate the concentrated brine to obtain brine; Post-processing module 340 is used to centrifuge, dry and calcine the brine to obtain heavy soda ash product; The pretreatment module 310 and the posttreatment module 340 use electrical energy from the wind power generation device, while the decomposition module 320, the crystallization module 330, and the posttreatment module 340 use water vapor from the electric thermal storage device 200.
[0036] Furthermore, combined Figure 2 The schematic diagram shown illustrates an embodiment of the heavy soda ash processing flow. The pretreatment module 310 includes a brine settling tank 311, a multi-media filter 313, and multi-stage activated carbon adsorption to remove impurities and refine the brine. A booster pump provides auxiliary transport between the brine settling tank 311 and the multi-media filter 313. The power required by the booster pump 312 is directly supplied by a wind power generator. After settling, the brine is drawn from the bottom or a lower position of the settling tank by the booster pump and transported to the next process stage. The selection of the booster pump must be determined based on factors such as the brine's flow rate, head, and corrosiveness to ensure stable and efficient brine transport.
[0037] In some embodiments, multi-stage activated carbon adsorption includes a primary activated carbon adsorption tank 314 and a secondary activated carbon adsorption tank 315. Multi-stage adsorption can further improve the purification level of the brine. Through two-stage adsorption, almost all organic matter and most pigments and odor substances in the brine can be removed. This makes the brine of higher quality and more suitable for subsequent processing, such as stripping decomposition, providing a purer raw material for the production of high-quality natural alkali products.
[0038] Furthermore, the decomposition module 320 includes a primary stripping decomposition tower 321 and a secondary stripping decomposition tower 322. The top of the primary stripping decomposition tower 321 is connected to the pretreatment module 310 to receive pretreated brine from the pretreatment module 310. The bottom of the primary stripping decomposition tower 321 is connected to the electric heat storage device 200 to receive steam from the electric heat storage device 200. The brine at the top and the steam at the bottom come into countercurrent contact to complete the primary decomposition and concentration of the brine. The top of the secondary stripping decomposition tower 322 is connected to the primary stripping decomposition tower 321 to receive the primary decomposition and concentration of brine from the primary stripping decomposition tower 321. The bottom of the secondary stripping decomposition tower 322 is connected to the electric heat storage device 200 to receive steam from the electric heat storage device 200. The brine at the top and the steam at the bottom come into countercurrent contact to complete the secondary decomposition and concentration of the brine. This module can achieve efficient decomposition of natural alkali components in the brine, separating the target natural alkali components from the brine and converting them into a form that is easy for subsequent processing through stripping. Meanwhile, multi-stage stripping decomposition can make the decomposition process more thorough and improve the extraction rate of natural alkali.
[0039] Furthermore, the crystallization module 330 includes multiple multi-effect evaporators connected in series, allowing each subsequent multi-effect evaporator to obtain secondary steam from the preceding multi-effect evaporator for evaporation and crystallization. Each multi-effect evaporator is connected in parallel with the electric heat storage device 200 to controllably obtain fresh water vapor. This parallel connection allows for controllable acquisition of fresh water vapor based on actual needs. In some embodiments, such as... Figure 2 The crystallization module 330 includes a series-connected primary multi-effect evaporator 331 and a secondary multi-effect evaporator 332. This series connection effectively concentrates the natural alkali solution, reducing its volume, and utilizes secondary steam, significantly saving energy. Through multi-effect evaporation, the natural alkali solution reaches the concentration required for subsequent processes such as centrifugal drying, improving the overall economic efficiency of the processing. Furthermore, the post-processing module 340 includes a centrifugal dryer 341 and a fluidized bed calcination device 342. The centrifugal dryer 341 is connected to the electric heat storage device 200 to transfer water vapor into the dryer 341 to dry the brine at high temperature. The fluidized bed calcination device 342 is connected to the wind power generation device 100 to further calcine the brine.
[0040] Furthermore, the energy storage time of the heat storage module (not shown) in the electric heat storage device 200 is 0~24h.
[0041] This invention aims to propose an evaporation and concentration process primarily utilizing stripping decomposition and multi-effect evaporation. Energy consumption consists of the fresh steam required for wet decomposition and multi-effect evaporation, and the electricity required for pump operation. All heat required for natural alkali processing is provided by steam. Steam is produced by heating water with wind power from an electric boiler. However, conventional electric boilers are rigid loads and cannot effectively utilize unstable wind power. Therefore, this invention proposes using an electric thermal storage boiler to generate steam. This boiler can convert unstable wind power into stored thermal energy, making it a flexible load. The wind power coupled with the electric thermal storage boiler can generate stable steam from unstable wind power for stable production in natural alkali processing plants. The electric thermal storage boiler is designed for 8 hours of electric heating and 24 hours of steam production. Compared to conventional coal-fired cogeneration, wind power supply can achieve zero carbon dioxide emissions.
[0042] Furthermore, the wind power generation device 100 is also connected to an uplink circuit to upload excess electrical energy to the power grid.
[0043] Furthermore, the electric heat storage device 200 has a maximum heat storage temperature of 400~650℃.
[0044] On the other hand, the present invention also provides a method for processing heavy soda ash using wind power coupled with flexible loads, comprising the following steps: S1 continuously acquires wind power and converts it into electricity; S2 uses electricity to heat water and convert it into steam. Some of the steam is directly transported to the heavy soda ash production system for brine processing, while the excess steam is stored for later use.
[0045] Furthermore, the method also includes: The electricity is directly supplied to the electrical equipment in the heavy soda ash production system.
[0046] Furthermore, a portion of the steam is directly supplied to the heavy soda ash production system for processing the brine, including: Some of the steam is directly supplied to the decomposition module within the heavy soda ash production system to decompose and concentrate the brine. Some of the steam is directly supplied to the crystallization module within the heavy soda ash production system to evaporate and crystallize the brine. Some of the steam is directly supplied to the post-processing module in the heavy soda ash production system to dry the brine at high temperature.
[0047] Furthermore, a portion of the steam is directly supplied to the decomposition module within the heavy soda ash production system to decompose and concentrate the brine, including: Some of the steam is directly supplied to the primary and secondary stripping decomposition towers of the decomposition module to decompose and concentrate the brine.
[0048] Furthermore, a portion of the steam is directly supplied to the crystallization module within the heavy soda ash production system to evaporate and crystallize the brine, including: Some of the water vapor is directly supplied to multiple multi-effect evaporators connected in series in the crystallization module to evaporate and crystallize the brine.
[0049] Furthermore, a portion of the steam is directly supplied to the post-processing module within the heavy soda ash production system for high-temperature drying of the brine, including: Some of the steam is directly supplied to the centrifugal dryer of the post-processing module to dry the brine at high temperature.
[0050] Furthermore, the electrical energy will be directly supplied to the electrical equipment within the heavy soda ash production system, including: The electricity is directly supplied to the booster pump of the pretreatment module in the heavy soda ash production system.
[0051] Furthermore, directly supplying electrical energy to the equipment within the heavy soda ash production system includes: The electrical energy is directly supplied to the fluidized bed calcination unit of the post-processing module within the heavy soda ash production system.
[0052] Furthermore, the method also includes uploading excess electrical energy to the power grid.
[0053] In addition, combined Figure 2 As shown, the specific process flow for alkali processing using the system of the present invention includes: S1 Pretreatment: Multi-stage impurity removal of natural alkaline brine to obtain refined brine; S2 decomposition and concentration: A stripping decomposition tower is used to complete the decomposition and concentration by countercurrent contact between steam and refined brine. S3 Multi-Effect Evaporation Crystallization: Using multiple multi-effect evaporators connected in series, water vapor is used to perform multi-stage evaporation and crystallization of concentrated refined brine to obtain brine. S4 post-processing: The brine is dried and calcined to obtain heavy soda ash product.
[0054] Specifically, in S1, the multi-stage impurity removal includes: Phase 1: Sedimentation removes silt and undissolved large particles. The brine first enters the sedimentation tank. In the sedimentation tank, the brine will remain still for a period of time under the influence of gravity. During this process, larger particles of impurities in the brine, such as silt and undissolved minerals, will gradually settle to the bottom of the sedimentation tank. To accelerate the sedimentation process, flocculants can be added. Flocculants can cause fine suspended particles to aggregate into larger particles, making them easier to settle.
[0055] The second stage involves removing suspended solids, colloids, and small organic particles from the brine using a multi-media filtration method. The brine enters a multi-media filter filled with various filter media of different particle sizes and materials, such as quartz sand, anthracite, and garnet. The brine flows from top to bottom through these filter media, during which smaller suspended particles and colloids are intercepted. The different particle sizes of the filter media create layers of filtration, from coarse to fine, improving the filtration efficiency.
[0056] The third stage: Removing organic matter, pigments, and odor substances from the brine through activated carbon adsorption. The filtered brine enters the activated carbon adsorption device. Activated carbon has a huge specific surface area and abundant microporous structure. As the brine passes through the activated carbon bed, organic matter, pigments, and odor substances in the brine are adsorbed onto the surface of the activated carbon. The adsorption process is mainly physical adsorption; these impurity molecules adhere to the micropores and surface of the activated carbon.
[0057] Further, in S2, the refined brine enters a two-stage stripping decomposition tower, where NaHCO3 in the brine is decomposed into Na2CO3. Simultaneously, NaOH solution is added, and the NaOH reacts with the concentrated NaHCO3 in the decomposed brine to generate Na2CO3. The deeply purified brine then enters a multi-stage stripping decomposition tower. In this tower, steam enters from the bottom, and brine enters from the top. The steam and brine come into countercurrent contact within the tower. Through the heat of the steam and the stripping effect, the natural alkaline components in the brine undergo a decomposition reaction, and the volatile components produced are stripped from the brine. In the multi-stage stripping decomposition tower, the brine sequentially passes through multiple trays or packed zones, undergoing multiple stripping decompositions to improve decomposition efficiency.
[0058] Furthermore, in S3, the solution containing natural alkali from the stripping decomposition tower enters the multi-effect evaporation system. In this system, the secondary steam generated in the previous evaporator serves as the heating steam for the next evaporator. The solution is heated and evaporated in each evaporator, gradually removing moisture and increasing the concentration of the natural alkali solution. Specifically, concentrated brine with Na2CO3 as its main component is heated using a multi-effect evaporation process with steam to further evaporate and concentrate the Na2CO3, causing it to crystallize out as alkali monohydrate (Na2CO3•H2O).
[0059] Furthermore, in S4, the monohydrate alkali crystals and mother liquor are transferred together to a two-phase centrifuge for centrifugal drying, and then transferred to a fluidized bed calcination device to remove the water of crystallization, thereby obtaining heavy soda ash (Na2CO3).
[0060] The energy consumption of this invention mainly includes the fresh steam used in the stripping decomposition tower and the multi-effect evaporator, as well as the electricity used by the pumps. The main characteristic of this process is that it reduces the electricity consumption of the natural alkali processing plant while increasing the steam consumption. The energy supply process uses a wind-powered electric thermal storage boiler, which primarily provides the fresh steam needed for the stripping decomposition tower and the multi-effect evaporator. The electricity required for the pumps is provided by green electricity from the wind farm. Multi-effect evaporation mainly utilizes steam to evaporate, concentrate, and crystallize brine. By replacing the MVR evaporation and concentration process with multi-effect evaporation (four-effect evaporator, five-effect evaporator) technology, the steam consumption is increased and the electricity consumption is reduced. This increases the steam production of the electric thermal storage boiler and increases the storage of unstable wind power conversion heat energy, enabling the stable utilization of unstable wind power for stable production in natural alkali processing plants.
[0061] The present invention will be further explained below with reference to specific embodiments.
[0062] Taking a 5 million tons / year natural alkali processing project as an example: the two-stage stripping decomposition tower and multi-effect evaporator require 757 t / h of fresh steam, equivalent to a heat load of 530 MW and an electricity load of 260 MW. A new wind power plant with an installed capacity of 2130 MW will generate 6.818 billion kWh annually, of which 4.895 billion kWh (71.8%) will be self-consumed and 1.923 billion kWh (28.2%) will be fed into the grid annually. Grid power will supplement the electricity demand, with 1.965 billion kWh supplied to the grid annually. Twenty-four new 90 MW electric thermal storage steam boilers will be built to provide heating for the process. Normal operation will rely on wind power; when wind power is insufficient, off-peak electricity will be used. The electric thermal storage furnace uses solid-state thermal storage to produce 757 t / h of steam for alkali processing. The parameters for a single electric thermal storage furnace are: rated electric thermal storage power 90MW / 66KV, maximum output power 30MW, maximum thermal storage capacity 487,500 kWh, maximum thermal storage temperature 650℃, 10MW×3 heat exchangers, and 2 fans. A 5 million ton / year natural alkali processing plant that relies entirely on coal-fired cogeneration generates an average of 4.55 million tons of carbon emissions annually. By using wind power coupled with an electric thermal storage boiler to power natural alkali processing, zero carbon dioxide emissions can be achieved directly from the power supply system.
[0063] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.
[0064] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.
[0065] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0066] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.
Claims
1. A system for processing heavy soda ash using wind power coupled with flexible loads, characterized in that, include: A wind power generation device, wherein the wind power generation device is used to obtain wind power and convert it into electrical energy; An electric thermal storage device, comprising a water storage module and a thermal storage module, wherein the electric thermal storage device is used to acquire electrical energy to convert water in the water storage module into water vapor and store it in the thermal storage module; A heavy soda ash production system, wherein the heavy soda ash production system obtains water vapor from the electric thermal storage device for use by equipment within the system.
2. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 1, characterized in that, The heavy soda ash production system obtains electrical energy from the wind power generation device to supply power to the electrical equipment within the system.
3. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 2, characterized in that, The heavy soda ash production system includes a pretreatment module, a decomposition module, a crystallization module, and a post-treatment module. The pretreatment module is used for brine sedimentation, filtration, and impurity adsorption. The decomposition module is used to decompose sodium bicarbonate in the brine into sodium carbonate and concentrate the brine. The crystallization module is used to further evaporate and concentrate the concentrated brine to obtain brine. The post-processing module is used to centrifuge, dry, and calcine the brine to obtain heavy soda ash product. The pretreatment module and the posttreatment module use the electrical energy of the wind power generation device, while the decomposition module, the crystallization module, and the posttreatment module use the water vapor of the electric thermal storage device.
4. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 3, characterized in that, The pretreatment module includes a brine sedimentation machine, a multi-media filter, and a multi-stage activated carbon adsorption device to remove impurities and refine the brine. The brine sedimentation machine and the multi-media filter are connected by an auxiliary pump, which is powered by the electricity generated by the wind power generation device.
5. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 3, characterized in that, The decomposition module includes a primary stripping decomposition tower and a secondary stripping decomposition tower, both of which are connected to the electric heat storage device to receive steam from the electric heat storage device to decompose and concentrate the brine.
6. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 3, characterized in that, The crystallization module includes multiple multi-effect evaporators connected in series, so that the next-level multi-effect evaporator can obtain secondary steam from the previous-level multi-effect evaporator for evaporation and crystallization. Each multi-effect evaporator is connected to the electric heat storage device to receive water vapor from the electric heat storage device for evaporation and crystallization of the brine.
7. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 3, characterized in that, The post-processing module includes a centrifugal dryer and a fluidized bed calcination device. The centrifugal dryer is connected to the electric heat storage device to receive water vapor from the electric heat storage device to dry the brine at high temperature. The fluidized bed calcination device uses the electrical energy of the wind power generation device to power the calcination of the brine.
8. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 1, characterized in that, The heat storage module is a heat container, which is provided with a heat insulation material layer. The heat container can store high-temperature water vapor for 0~24 hours.
9. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 8, characterized in that, The thermal insulation material layer includes an alumina ceramic layer and a silicon carbide ceramic layer.
10. The system for processing heavy soda ash using wind power coupled with flexible loads as described in claim 8, characterized in that, The maximum heat storage temperature of the heat container is 400~650℃.
11. The system for processing heavy soda ash using wind power coupled with flexible loads according to claim 1, characterized in that, The wind power generation device is also connected to an uplink circuit to upload excess electrical energy to the power grid.
12. A method for processing heavy soda ash using wind power coupled with flexible loads, characterized in that, include: S1 continuously acquires wind power and converts it into electrical energy; S2 uses the electrical energy to heat water and convert it into steam. Some of the steam is directly transported to the heavy soda ash production system for brine processing, and the excess steam is stored for later use.
13. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 12, characterized in that, Also includes: The electrical energy is directly supplied to the electrical equipment in the heavy soda ash production system.
14. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 12, characterized in that, A portion of the steam is directly supplied to the heavy soda ash production system for brine processing, including: Some of the steam is directly supplied to the decomposition module within the heavy soda ash production system to decompose and concentrate the brine. Some of the steam is directly supplied to the crystallization module within the heavy soda ash production system to evaporate and crystallize the brine. Some of the steam is directly supplied to the post-processing module in the heavy soda ash production system to dry the brine at high temperature.
15. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 14, characterized in that, A portion of the steam is directly supplied to the decomposition module within the heavy soda ash production system to decompose and concentrate the brine, including: Some of the steam is directly supplied to the primary and secondary stripping decomposition towers of the decomposition module to decompose and concentrate the brine.
16. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 14, characterized in that, A portion of the steam is directly supplied to the crystallization module within the heavy soda ash production system to evaporate and crystallize the brine, including: Some of the water vapor is directly supplied to multiple multi-effect evaporators connected in series in the crystallization module to evaporate and crystallize the brine.
17. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 14, characterized in that, A portion of the steam is directly supplied to the post-processing module within the heavy soda ash production system for high-temperature drying of the brine, including: Some of the water vapor is directly supplied to the centrifugal dryer of the post-processing module to dry the brine at high temperature.
18. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 13, characterized in that, The electrical energy is directly supplied to the electrical equipment within the heavy soda ash production system, including: The electrical energy is directly supplied to the booster pump of the pretreatment module in the heavy soda ash production system.
19. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 13, characterized in that, Directly supplying the electrical energy to the electrical equipment within the heavy soda ash production system includes: The electrical energy is directly supplied to the fluidized bed calcination unit of the post-processing module within the heavy soda ash production system.
20. The method for processing heavy soda ash using wind power coupled with flexible loads according to claim 12, characterized in that, Also includes: Excess electrical energy is uploaded to the power grid.