A desulfurized gypsum resource utilization system

Abstract

The application belongs to the field of solid waste treatment, and specifically discloses a desulfurization gypsum resource utilization system, which comprises a microbial reaction device, a separation device, an evaporation crystallizer, a first storage and a second storage, wherein: one end of the microbial reaction device is used for being connected with a coal-fired power plant and is provided with a microbial feeding port, and is used for adding first microorganisms to convert calcium sulfate in the desulfurization gypsum into calcium carbonate and an ammonium sulfate solution; the other end of the microbial reaction device is connected with the separation device; a solid outlet of the separation device is connected with the first storage; and a liquid outlet is connected with the evaporation crystallizer to obtain ammonium sulfate crystals and send them into the second storage for storage. Through the microbial reaction device, the desulfurization gypsum can be converted into calcium carbonate and the ammonium sulfate solution by using microorganisms, and the subsequent separation device and the evaporation crystallizer are used to realize the recycling of the calcium carbonate and the ammonium sulfate, and the application has the beneficial effects of low cost and low energy consumption.

Description

Technical Field

[0001] This application belongs to the field of solid waste treatment, and more specifically, relates to a desulfurized gypsum resource utilization system. Background Technology

[0002] Desulfurized gypsum is an industrial byproduct obtained by desulfurizing and purifying flue gas produced from the combustion of sulfur-containing fuels. It contains abundant mineral nutrients such as sulfur, calcium, and silicon. Although the application of desulfurized gypsum in some fields is quite mature, its utilization rate is still low. Large quantities of desulfurized gypsum and fly ash can only be disposed of through stockpiling, which not only causes serious environmental pollution but also results in a significant waste of land resources and the unique resources contained in coal-based solid waste. In existing technologies, the chemical conversion of desulfurized gypsum is costly and energy-intensive, and it is difficult to achieve a synergistic effect between resource utilization and ecological restoration. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a desulfurized gypsum resource utilization system, which aims to solve the problems of environmental pollution and inability to achieve resource recycling in existing desulfurized gypsum disposal methods.

[0004] This application provides a desulfurized gypsum resource utilization system, specifically comprising a microbial reactor, a separation device, an evaporator / crystallizer, a first storage tank, and a second storage tank. One end of the microbial reactor is connected to a coal-fired power plant to feed desulfurized gypsum. The reactor also has a microbial inlet for adding first microorganisms to convert calcium sulfate in the desulfurized gypsum into calcium carbonate and ammonium sulfate solutions, thus forming a microbial treatment liquid. The other end of the reactor is connected to the separation device for solid-liquid separation to obtain calcium sulfate solid and filtrate. The solid outlet of the separation device is connected to the first storage tank for storing calcium sulfate solid, and the liquid outlet is connected to the evaporator / crystallizer for crystallization to obtain ammonium sulfate crystals. The outlet of the evaporator / crystallizer is connected to the second storage tank for storing ammonium sulfate crystals.

[0005] Compared with the prior art, the above-described technical solution conceived in this application, by setting up a microbial reaction device, can utilize microorganisms to convert calcium sulfate in desulfurized gypsum into calcium carbonate and ammonium sulfate solutions, and, in conjunction with subsequent separation devices and evaporation crystallizers, realize the recovery and reuse of calcium carbonate and ammonium sulfate, thereby achieving the resource utilization of desulfurized gypsum while having the advantages of low cost and low energy consumption.

[0006] As a further preferred embodiment, the desulfurized gypsum resource utilization system also includes a cooling crystallizer, which is located between the separation device and the evaporation crystallizer, and is used to cool and crystallize the filtrate to remove impurities before sending it into the evaporation crystallizer.

[0007] As a further preferred embodiment, the heating tube inlet of the evaporator crystallizer is used to connect to a coal-fired power plant to utilize the waste heat from the flue gas of the coal-fired power plant for evaporation crystallization.

[0008] As a further preferred embodiment, the microbial reaction device is a pressure reactor.

[0009] As a further preferred embodiment, the microbial reactor is also provided with a pressure relief port for releasing pressure when the pressure of the microbial reactor exceeds a threshold.

[0010] As a further preferred embodiment, the microbial reaction device is internally equipped with a heating component to provide heating reaction conditions.

[0011] As a further preferred embodiment, the first storage container is provided with a drying component for drying the calcium sulfate solid.

[0012] As a further preferred embodiment, the second storage unit is provided with a dehumidification component for controlling the humidity of the second storage unit.

[0013] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages: 1. This application, by setting up a microbial reaction device, can utilize microorganisms to convert calcium sulfate in desulfurized gypsum into calcium carbonate and ammonium sulfate solutions, and, in conjunction with subsequent separation devices and evaporation crystallizers, realize the recovery and reuse of calcium carbonate and ammonium sulfate, and has the beneficial effects of low cost and low energy consumption. 2. At the same time, by setting a cooling crystallizer between the separation device and the evaporation crystallizer, this application can cool and crystallize the filtrate to remove impurities such as magnesium sulfate from the filtrate, and then send it into the evaporation crystallizer, thereby effectively improving the purity of the ammonium sulfate crystals obtained. 3. In addition, this application connects the heating tube inlet of the evaporator crystallizer to a coal-fired power plant to utilize the waste heat of the flue gas from the coal-fired power plant for evaporation and crystallization, thereby further reducing the cost and energy consumption of the desulfurized gypsum resource utilization system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the desulfurized gypsum resource utilization system provided in the embodiments of this application; Figure 2 This is a process flow diagram of the desulfurized gypsum resource utilization system provided in this application embodiment for mine restoration.

[0015] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-Coal-fired power plant, 2-Microbial reaction device, 3-First microorganism, 4-Separation device, 5-Cooling crystallizer, 6-First storage container, 7-Evaporation crystallizer, 8-Second storage container, 9-Mining base, 10-Plant, 11-Second microorganism. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0017] like Figure 1 As shown, this application provides a desulfurized gypsum resource utilization system, specifically including a microbial reactor 2, a separation device 4, an evaporator crystallizer 7, a first storage tank 6, and a second storage tank 8. One end of the microbial reactor 2 is connected to a coal-fired power plant 1 to feed desulfurized gypsum. Simultaneously, the microbial reactor 2 has a microbial inlet for adding a first microorganism 3 to convert calcium sulfate in the desulfurized gypsum into calcium carbonate and ammonium sulfate solutions, thereby forming a microbial treatment liquid. The other end of the microbial reactor 2 is connected to the separation device 4 to send the microbial treatment liquid into the separation device 4 for solid-liquid separation to obtain calcium sulfate solid and filtrate. The main component of the filtrate is ammonium sulfate, and it may contain some impurities such as magnesium sulfate. The solid outlet of the separation device 4 is connected to the first storage tank 6 for storing calcium sulfate solid, which can be sold; the liquid outlet of the separation device 4 is connected to the evaporator crystallizer 7 for sending the filtrate into the evaporator crystallizer 7 for crystallization to obtain ammonium sulfate crystals. The outlet of the evaporator crystallizer 7 is connected to the second storage tank 8 for storing ammonium sulfate crystals, which can also be sold, thereby realizing the resource utilization of desulfurized gypsum. At the same time, the system does not require a high-temperature reaction environment and has the advantages of low cost and low energy consumption.

[0018] In this application, the first microorganism is any existing microorganism capable of converting calcium sulfate into calcium carbonate and ammonium sulfate through metabolism, and can be selected according to actual needs. The desulfurized gypsum resource utilization system provided in this application, by setting up a microbial reaction device, can utilize microorganisms to convert calcium sulfate in desulfurized gypsum into calcium carbonate and ammonium sulfate solutions. Combined with subsequent separation devices and evaporation crystallizers, it achieves the recovery and reuse of calcium carbonate and ammonium sulfate. Calcium carbonate has high industrial value and can be sold as a building material additive or soil conditioner, while ammonium sulfate has high agricultural value and can be used directly as nitrogen fertilizer for mine vegetation restoration or for sale. This achieves solid waste resource utilization, not only eliminating solid waste pollution from desulfurized gypsum but also generating economic benefits, contributing to ecological restoration, and realizing efficient resource utilization.

[0019] Furthermore, considering that the solubility of impurities in the filtrate, such as magnesium sulfate, changes more rapidly with temperature compared to ammonium sulfate, the filtrate can be cooled first to remove impurities such as magnesium sulfate before evaporation and crystallization to improve the purity of ammonium sulfate crystals. Therefore, the desulfurized gypsum resource utilization system also includes a cooling crystallizer 5, which is set between the separation device 4 and the evaporation crystallizer 7. It is used to cool and crystallize the filtrate to remove impurities such as magnesium sulfate before sending it to the evaporation crystallizer 7.

[0020] Furthermore, the heating tube inlet of the evaporator crystallizer 7 is connected to the coal-fired power plant 1 to utilize the waste heat from the flue gas of the coal-fired power plant for evaporation and crystallization. This forms a sustainable circular economy model of "solid waste treatment - product sales - ecological value-added". By reusing the waste heat from the flue gas of the coal-fired power plant and selling calcium carbonate and ammonium sulfate, the dependence on external funds can be reduced, allowing ecological restoration to shift from passive investment to active recycling and improving the feasibility of technology promotion.

[0021] Furthermore, the microbial reactor 2 employs a pressure reactor, thereby creating suitable pressure conditions for microbial participation in the reaction, promoting specific microbial metabolic processes, and facilitating the conversion of desulfurized gypsum. Simultaneously, the microbial reactor 2 is also equipped with a pressure relief port to release pressure when the pressure in the microbial reactor 2 exceeds a threshold, ensuring production safety.

[0022] Furthermore, the microbial reactor 2 is equipped with a heating component to provide heating reaction conditions, thereby promoting the conversion of calcium sulfate in desulfurized gypsum into calcium carbonate and ammonium sulfate solution by microorganisms and accelerating the reaction process.

[0023] Furthermore, the first storage container 6 is equipped with a drying component for drying the surface of the calcium sulfate solid obtained after solid-liquid separation, so that it can be directly used for commercial sale.

[0024] Furthermore, the second storage container 8 is equipped with a dehumidification component to control the humidity of the second storage container 8 and prevent ammonium sulfate crystals from absorbing moisture, clumping, or decomposing in a humid environment.

[0025] The ammonium sulfate crystals obtained in this application can be transported to the mining base 9 and sprayed onto the soil as fertilizer to supplement nitrogen nutrients and regulate soil pH. Simultaneously, a second microorganism 11 can be applied to the mining base 9. This second microorganism 11 primarily functions to solidify loose soil, improve soil structure, and increase soil fertility. In conjunction with the ammonium sulfate crystals, short-life-cycle plants 10, such as rapeseed, are planted in the improved soil, further improving the soil environment and rapidly forming vegetation cover to curb soil erosion. This application, based on the use of ammonium sulfate derived from desulfurized gypsum to provide nitrogen fertilizer, combined with the second microorganism 11 to solidify the soil and the plants 10 to improve the microenvironment, forms a synergistic remediation system of "nitrogen fertilizer-microorganism-plant," enhancing the stability of soil remediation, enabling the remediated ecosystem to have self-sustaining capabilities, preventing further degradation, and improving ecological effects.

[0026] The process flow diagram of the desulfurized gypsum resource utilization system for mine restoration provided in this application is as follows: Figure 2 As shown, coal-fired power plant 1 provides desulfurized gypsum as raw material. The desulfurized gypsum and the first microorganism 3 are used in a microbial reactor to convert calcium sulfate into calcium carbonate and ammonium sulfate solutions to form a microbial treatment liquid. Separation device 4 separates the microbial treatment liquid, obtaining calcium carbonate solid and filtrate. The calcium sulfate solid is sent to the first storage tank 6 for storage, while the filtrate is sent to an evaporator crystallizer 7. Using the waste heat from the flue gas of coal-fired power plant 1, ammonium sulfate crystals are obtained and sent to the second storage tank 8 for storage. The calcium carbonate solid is sold as a building material additive or soil conditioner, and the sales revenue can be used to cover the costs of purchasing microbial agents and equipment maintenance. The ammonium sulfate crystals are supplied as nitrogen fertilizer to mining base 9 and can also be sold. Mining base 9 uses ammonium sulfate nitrogen fertilizer and the second microorganism to initially solidify and repair the soil, enhancing soil fertility and making the mining area environment suitable for vegetation. Short-life plants such as rapeseed are then planted to further improve the soil environment of the mining area. Ultimately, a sustainable "desulfurized gypsum-microorganism-mine" operation mechanism will be established, a complete ecological restoration system will be built, the goal of mine ecological reshaping will be achieved, and strong support will be provided for the sustainable development of ecological restoration.

[0027] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A desulfurized gypsum resource utilization system, characterized in that, The system includes a microbial reaction device (2), a separation device (4), an evaporator crystallizer (7), a first storage tank (6), and a second storage tank (8). One end of the microbial reaction device (2) is connected to a coal-fired power plant (1) to feed desulfurized gypsum. The microbial reaction device (2) is provided with a microbial inlet for adding a first microorganism (3) to convert calcium sulfate in the desulfurized gypsum into calcium carbonate and ammonium sulfate solution to form a microbial treatment liquid. The other end of the microbial reaction device (2) is connected to the separation device (4) to feed the microbial treatment liquid into the separation device (4) for solid-liquid separation to obtain calcium sulfate solid and filtrate. The solid outlet of the separation device (4) is connected to the first storage tank (6) to store calcium sulfate solid. The liquid outlet of the separation device (4) is connected to the evaporator crystallizer (7) to feed the filtrate into the evaporator crystallizer (7) for crystallization to obtain ammonium sulfate crystals. The outlet of the evaporator crystallizer (7) is connected to the second storage tank (8) to store ammonium sulfate crystals.

2. The desulfurized gypsum resource utilization system as described in claim 1, characterized in that, The desulfurized gypsum resource utilization system also includes a cooling crystallizer (5), which is located between the separation device (4) and the evaporation crystallizer (7) to cool and crystallize the filtrate to remove impurities before sending it into the evaporation crystallizer (7).

3. The desulfurized gypsum resource utilization system according to claim 1, wherein The heating tube inlet of the evaporator crystallizer (7) is used to connect to the coal-fired power plant (1) to utilize the waste heat of the flue gas from the coal-fired power plant (1) for evaporation crystallization.

4. The desulfurized gypsum resource utilization system according to claim 1, wherein The microbial reaction device (2) is a pressure reactor.

5. The desulfurized gypsum resource utilization system according to claim 4, wherein The microbial reactor (2) is also provided with a pressure relief port for releasing pressure when the pressure of the microbial reactor (2) exceeds the threshold.

6. The desulfurized gypsum resource utilization system according to any one of claims 1 to 5, characterized in that, The microbial reaction device (2) is equipped with a heating component inside to provide heating reaction conditions.

7. The desulfurized gypsum resource utilization system according to any one of claims 1 to 5, characterized by, The first storage container (6) is equipped with a drying component for drying calcium sulfate solid.

8. The desulfurized gypsum resource utilization system according to any one of claims 1 to 5, characterized in that, The second storage unit (8) is equipped with a dehumidification component to control the humidity of the second storage unit (8).

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