Flue gas deacidification system capable of efficiently absorbing and recycling

Abstract

The utility model belongs to the technical field of flue gas deacidification, and particularly relates to a flue gas deacidification system capable of efficiently absorbing and recycling, which comprises a deacidification tower body, a lower-layer circulating pump, a lower-layer heat exchanger, an upper-layer circulating tank, an upper-layer circulating pump, an upper-layer heat exchanger, a liquid supplementing tank, a liquid supplementing pump and an upper-layer spraying system arranged at the upper end in the deacidification tower body, the upper layer spraying system is arranged at the upper end of the interior of the deacidification tower body, the lower layer spraying system is arranged at the lower end of the interior of the deacidification tower body, a gas outlet is formed in the top of the deacidification tower body, and a gas inlet is formed in the left side wall of the deacidification tower body. According to the scheme, hydrogen chloride gas in the flue gas is selectively absorbed by utilizing the wet deacidification tower, and when the hydrogen chloride is absorbed to be saturated, the hydrogen chloride is discharged, purified and recycled, so that the medicament cost for treating the acidic flue gas can be saved, the resource recycling can be realized, and the effects of reducing the cost and improving the efficiency are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas deacidification technology, specifically relating to a flue gas deacidification system that efficiently absorbs and recycles flue gas. Background Technology

[0002] The flue gas from waste incineration plants has a complex and diverse composition. In addition to the usual oxygen, carbon dioxide, and nitrogen, it also contains the following harmful pollutants: particulate matter, sulfur dioxide, nitrogen oxides, acidic gases containing chlorine and fluorine, carbon monoxide, dioxins, and heavy metals.

[0003] To reduce the environmental impact of flue gas emissions, advanced flue gas purification technologies are typically employed, such as dry, semi-dry, or wet flue gas treatment systems, as well as devices like activated carbon adsorption and baghouse dust collectors, to remove harmful substances from the flue gas. These technologies effectively reduce the concentration of harmful pollutants in the flue gas, ensuring that it meets emission standards before being released.

[0004] Sulfur oxides and acidic gases (such as hydrogen chloride and sulfur dioxide) in the flue gas are removed through desulfurization and deacidification processes. These typically include various methods such as semi-dry, dry, and wet processes.

[0005] The semi-dry method utilizes a spray drying absorption tower, where alkaline solutions such as lime slurry are sprayed to react with acidic gases.

[0006] The dry method involves spraying alkaline powder into a reaction absorber to react with acidic gas;

[0007] The wet method involves using an alkaline solution in a scrubbing tower to clean the flue gas.

[0008] These processes all employ chemical methods, utilizing alkaline substances to neutralize acidic gases, thereby reducing the acidic components in the flue gas. The byproducts generated after the reaction require further advanced treatment. This leads to resource waste and increased operating costs. Utility Model Content

[0009] To address the problems mentioned in the background art, this utility model provides a highly efficient flue gas desulfurization system for absorption and recycling, comprising a desulfurization tower body, a lower circulating pump, a lower heat exchanger, an upper circulating tank, an upper circulating pump, an upper heat exchanger, a makeup liquid tank, and a makeup liquid pump. It also includes an upper spray system located at the upper part of the desulfurization tower body and a lower spray system located at the lower part of the desulfurization tower body.

[0010] As a highly efficient flue gas desulfurization system for absorption and recycling according to this utility model, preferably, the top of the desulfurization tower body is provided with an air outlet, and the left side wall of the desulfurization tower body is provided with an air inlet.

[0011] As a highly efficient flue gas desulfurization system for absorption and recycling according to this utility model, preferably, the upper spray system, the upper circulation tank and the upper circulation pump are assembled together, and the upper heat exchanger and the upper circulation pump are assembled together.

[0012] As a highly efficient flue gas desulfurization system for absorption and recycling, preferably, the lower spray system, the lower circulation pump and the lower heat exchanger are assembled together, the rotating shaft is provided with a drive gear in the middle, and the bottom of the drive gear is provided with a spiral reflux mechanism.

[0013] As a highly efficient flue gas deacidification system for absorption and recycling according to this utility model, preferably, the replenishment tank is assembled with the upper spray system and the lower spray system respectively through a replenishment pump.

[0014] As a highly efficient flue gas desulfurization system for absorption and recycling according to this utility model, preferably, the upper spray system and the lower spray system are both set to independent circulation and independent storage.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This system is designed for the efficient absorption and recovery of hydrogen chloride gas in flue gas. The proposed solution utilizes a wet scrubber to selectively absorb hydrogen chloride from the flue gas. When the absorption reaches saturation, the hydrogen chloride is discharged for purification and resource utilization. This approach not only saves on the cost of reagents used to treat acidic flue gas but also enables resource recovery, resulting in cost reduction and efficiency improvement. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a flowchart illustrating the present invention.

[0019] In the picture:

[0020] 1. Air outlet; 2. Upper spray system; 3. Lower spray system; 4. Air inlet; 5. Lower circulation pump; 6. Lower heat exchanger; 7. Upper circulation tank; 8. Upper circulation pump; 9. Upper heat exchanger; 10. Make-up tank; 11. Make-up pump. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0022] like Figure 1 As shown;

[0023] A highly efficient flue gas desulfurization system for absorption and recycling includes a desulfurization tower body, a lower circulation pump 5, a lower heat exchanger 6, an upper circulation tank 7, an upper circulation pump 8, an upper heat exchanger 9, a makeup liquid tank 10, and a makeup liquid pump 11.

[0024] In this implementation plan: In order to solve the technical problems existing in the prior art, such as the "semi-dry method using a spray drying absorption tower to spray alkaline solutions such as lime slurry to react with acidic gases" disclosed in the background art above;

[0025] The dry method involves spraying alkaline powder into a reaction absorber to react with acidic gas;

[0026] The wet method involves using an alkaline solution in a scrubbing tower to clean the flue gas.

[0027] These processes all employ chemical methods, utilizing alkaline substances to neutralize acidic gases, thereby reducing the acidic components in flue gas. However, the byproducts generated after the reaction require further advanced treatment. This leads to resource waste and increased operating costs. In practical terms, this problem is clearly real and difficult to solve. Therefore, to address this technical issue, a highly efficient flue gas deacidification system for absorption and recycling is provided.

[0028] like Figure 1 As shown in the figure;

[0029] In conjunction with the above, it also includes an upper spray system 2 located at the upper part of the deacidification tower body, and a lower spray system 3 located at the lower part of the deacidification tower body.

[0030] In an optional embodiment, the top of the deacidification tower body is provided with an air outlet 1, and the left side wall of the deacidification tower body is provided with an air inlet 4.

[0031] In an optional embodiment, the upper spray system 2, the upper circulation tank 7 and the upper circulation pump 8 are assembled together, and the upper heat exchanger 9 is assembled together with the upper circulation pump 8.

[0032] In an optional embodiment, the lower spray system 3, the lower circulation pump 5, and the lower heat exchanger 6 are assembled together, and a drive gear is provided in the middle of the rotating shaft, and a spiral reflux mechanism is provided at the bottom of the drive gear.

[0033] In an optional embodiment, the replenishment tank 10 is assembled with the upper spray system 2 and the lower spray system 3 respectively via a replenishment pump 11.

[0034] In an optional embodiment, both the upper spray system 2 and the lower spray system 3 are configured to have independent circulation and independent storage.

[0035] The working principle of this utility model:

[0036] The tower is equipped with two independent spray systems. The two spray systems are independent of each other and do not affect each other. After cooling, the flue gas enters the deacidification tower and is treated by the lower spray absorption deacidification process before entering the upper spray system to further remove residual acidic gases in the flue gas. The deacidified flue gas enters the subsequent flue gas treatment system. The upper and lower spray liquids are independently circulated and stored.

[0037] The spray liquid is pumped into the spray system through a circulating pump. After being atomized by the nozzles, it comes into counter-phase contact with the flue gas entering the tower to absorb the acidic gases in the flue gas. During this process, a heat exchanger is used for water-to-water heat exchange to control the water temperature, thereby controlling the volume of the absorbent liquid and ensuring water balance.

[0038] The scrubbing liquid consists of inorganic salts, which absorb acidic gases from the flue gas during the circulation process. Once the scrubbing liquid becomes saturated, it is transferred and stored, and then fresh scrubbing liquid is added for further absorption. The deacidified flue gas then enters the downstream flue gas treatment system for further processing.

[0039] The deacidification tower is designed as a multi-stage treatment system, which absorbs acidic gases from the flue gas multiple times to reduce the concentration of acidic gases in the flue gas.

[0040] The technical solution of this application has the following advantages compared with the prior art:

[0041] Achieving operational goals, reducing costs, and increasing efficiency

[0042] From an operational perspective, reducing the use of calcium-based deacidifying agents can directly achieve the goal of cost reduction and efficiency improvement. Currently, the mainstream flue gas deacidification processes are mainly dry, semi-dry, and traditional wet methods. These processes inevitably consume large amounts of inorganic alkali, with the cost of flue gas deacidification alone accounting for more than 20% of daily operating costs. This system is expected to significantly reduce the consumption of traditional calcium-based deacidifying agents, achieving the goal of cost reduction and efficiency improvement.

[0043] Reduce fly ash emissions and strictly control pollution.

[0044] From the perspective of total fly ash production, current policies regarding fly ash disposal in the waste incineration sector are being introduced one after another, and the trend towards zero-waste cities and zero landfill is becoming increasingly stringent. Considering the high costs and potential for secondary pollution from fly ash disposal, achieving fly ash reduction at the source is of great significance. More than 50% of fly ash generation is typically caused by the large-scale use of calcium-based deacidifying agents. This system is expected to significantly reduce the consumption of deacidifying agents, thereby achieving fly ash reduction at the source and providing multiple economic, environmental, and social benefits.

[0045] Zero-waste cities reduce pollution and carbon emissions

[0046] From the perspective of exploring resource utilization in zero-waste cities, the chlorine in flue gas is released during the incineration of chlorinated waste, and the vast majority exists in the form of hydrogen chloride molecules, which are essentially an inorganic acid resource. This process can selectively enrich hydrogen chloride in flue gas in molecular form, thus providing a prerequisite for subsequent hydrogen chloride resource utilization.

[0047] Technology reserves, research and development exploration

[0048] From the perspective of environmental protection standards and low carbon emissions, environmental emission standards have been continuously raised in recent years. Enterprises are facing the dual challenges of environmental compliance and production efficiency. The development and reserve of new technologies can help them develop in the future.

[0049] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency flue gas deacidification system capable of absorbing and recycling, comprising a deacidification tower body, a lower circulating pump (5), a lower heat exchanger (6), an upper circulating tank (7), an upper circulating pump (8), an upper heat exchanger (9), a liquid supplement tank (10) and a liquid supplement pump (11), characterized in that: It also includes the upper layer spraying system (2) arranged at the upper end inside the deacidification tower body, and the lower layer spraying system (3) arranged at the lower end inside the deacidification tower body.

2. The flue gas deacidification system with high efficiency of absorption and recycling according to claim 1, characterized in that: The deacidification tower body is provided with a gas outlet (1) at the top, and is provided with a gas inlet (4) at the left side wall.

3. The flue gas deacidification system with high efficiency of absorption and recycling according to claim 1, characterized in that: The upper layer spraying system (2), the upper layer circulating tank (7) and the upper layer circulating pump (8) are assembled.

4. The flue gas deacidification system with high efficiency of absorption and recycling according to claim 1, characterized in that: The lower layer spraying system (3), the lower layer circulating pump (5) and the lower layer heat exchanger (6) are assembled.

5. The system for flue gas deacidification according to claim 1, wherein: The liquid supplementing tank (10) is assembled with the upper layer spraying system (2) and the lower layer spraying system (3) through the liquid supplementing pump (11) respectively.

6. The system for flue gas deacidification according to claim 1, wherein: The upper layer spraying system (2) and the lower layer spraying system (3) are both arranged as independent circulation and independent storage.

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