A limestone-gypsum method desulfurization device
Patent Information
- Application Number
- CN202522223558.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-10-21
AI Technical Summary
这种高温烟气直接排放不仅浪费了大量热能，还在排放过程中容易形成“白烟”现象，影响视觉环境
本实用新型提供了一种石灰石-石膏法脱硫装置，含硫烟气从烟气进口进入后，第一石灰石浆液喷淋层喷淋的石灰石浆液经溢流板延长石灰石浆液喷淋液的流动路径，使上升的烟气与石灰石浆液喷淋液形成充分的逆向接触，实现第一阶段脱硫；烟气继续上升后穿过旋流板，形成高速旋转的上升气流，与第二石灰石浆液喷淋层的喷淋在导流叶上形成的石灰石浆液液膜接触，实现对烟气的再次脱硫，并初步实现气液分离。再次脱硫后的烟气上升经气-液换热器冷凝，经除雾器捕获分离液滴，从而经烟气出口排出洁净烟气。完成脱硫的浆液落入塔体底部，经出料口进入浆液池，在浆液池内将亚硫酸钙氧化为石膏，经排渣口排出。
Smart Images
Figure CN224893790U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of desulfurization technology, specifically to a limestone-gypsum desulfurization device. Background Technology
[0002] In current industrial production, especially in large-scale industrial sectors such as coal-fired power plants, flue gas desulfurization is a key link in reducing environmental pollution and achieving sustainable development. The limestone-gypsum method is widely used due to its mature technology and high desulfurization efficiency. However, existing limestone-gypsum desulfurization devices still face some problems that urgently need to be addressed in practical applications.
[0003] On the one hand, in the process of contacting flue gas with limestone slurry, conventional desulfurization devices suffer from insufficient mass transfer efficiency between the gas and liquid phases, resulting in some sulfur dioxide failing to fully react with the limestone slurry. Consequently, the residual sulfur dioxide content in the desulfurized flue gas remains high, especially under conditions of high-sulfur coal combustion and large fluctuations in flue gas flow rate, where the problem of low desulfurization efficiency is even more prominent.
[0004] On the other hand, the flue gas is discharged at a relatively high temperature after desulfurization, usually around 50-60℃. Direct emission of this high-temperature flue gas not only wastes a lot of heat energy, but also easily forms "white smoke" during the emission process, affecting the visual environment.
[0005] Therefore, there is an urgent need to provide a method that can effectively recover waste heat energy from clean flue gas while ensuring improved desulfurization efficiency, thereby achieving energy saving and efficient desulfurization, and better meeting the needs of flue gas desulfurization in industrial production. Utility Model Content
[0006] In view of the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a limestone-gypsum desulfurization device that improves desulfurization efficiency while reducing energy waste.
[0007] To achieve the above objectives, this utility model provides the following solution: A limestone-gypsum desulfurization device includes a tower body with a flue gas inlet at the bottom and a flue gas outlet at the top. A first limestone slurry spray layer and a second limestone slurry spray layer are arranged from bottom to top within the tower body. Both the first and second limestone slurry spray layers are connected to a slurry tank located on the outside of the tower body. Overflow plates are staggered along the height between the first limestone slurry spray layer and the flue gas inlet. A swirl plate is installed between the second limestone slurry spray layer and the flue gas outlet; a demister is fixedly installed between the second limestone slurry spray layer and the flue gas outlet; an oxidation air pipeline is installed at the bottom of the slurry tank; a liquid-liquid heat exchanger is installed above the oxidation air pipeline in the slurry tank; a gas-liquid heat exchanger is installed between the second limestone slurry spray layer and the demister; the inlet end of the gas-liquid heat exchanger is a refrigerant liquid inlet; the outlet end of the gas-liquid heat exchanger is connected to the inlet end of the liquid-liquid heat exchanger through a circulation pipe.
[0008] In one feasible implementation, the overflow plates arranged in an alternating manner inside the tower can guide the limestone slurry spray liquid to form a more uniform distribution inside the tower, and can also extend the flow path of the limestone slurry spray liquid, ensuring that the rising flue gas and the limestone slurry spray liquid form sufficient reverse contact, thereby improving the desulfurization efficiency.
[0009] In one feasible implementation, the refrigerant liquid absorbs heat from the flue gas through a gas-liquid heat exchanger, lowering the flue gas temperature. Excess water vapor in the flue gas is condensed into larger droplets, which are captured and separated by a demister, resulting in the discharge of clean flue gas. Simultaneously, the temperature of the refrigerant liquid rises, flowing out from the outlet of the gas-liquid heat exchanger and entering the inlet of the liquid-liquid heat exchanger. There, it continues to exchange heat with the limestone slurry in the slurry pool, thus preheating the limestone slurry. The preheated limestone slurry can improve the solubility of the limestone absorbent in the slurry and, after spraying, enhance its absorption capacity for sulfur dioxide in the flue gas, thereby improving absorption efficiency.
[0010] In one feasible implementation, the first limestone slurry spray layer and the second limestone slurry spray layer are equipped with pumps on the connecting pipelines to the slurry tank.
[0011] In one feasible implementation, the flue gas inlet is located below the first limestone slurry spray layer.
[0012] In one feasible implementation, an overflow port is provided on the side of the overflow plate away from the inner wall of the tower.
[0013] In one feasible implementation, an overflow weir is fixedly connected to the edge of the overflow outlet.
[0014] In one feasible implementation, an overflow weir is set up to maintain a certain liquid level of limestone slurry spray liquid on the overflow plate, guiding the limestone slurry spray liquid to be evenly distributed on the overflow plate, ensuring that the flue gas and limestone slurry spray liquid are in full contact, and flowing into the next overflow plate when the liquid level is higher than the overflow weir.
[0015] In one feasible implementation, several through holes are evenly distributed on the overflow plate.
[0016] In one feasible implementation, a water curtain can be formed by creating through holes, thereby increasing the contact surface area between the limestone slurry spray liquid and the flue gas.
[0017] In one feasible implementation, the swirl plate is mounted on the inner wall of the tower body via a support flange.
[0018] In one feasible implementation, the swirl plate includes a central support and an outer flange ring.
[0019] In one feasible implementation, several evenly distributed guide vanes are welded between the central support and the outer peripheral flange ring.
[0020] In one feasible implementation, the guide vanes are tilted.
[0021] In one feasible implementation, the flue gas passes upward through the guide vanes. Because the guide vanes are tilted at a fixed angle, the flue gas becomes a high-speed rotating upward airflow. The limestone slurry of the second limestone slurry spray layer is sprayed onto the guide vanes to form a liquid film. The upward airflow and the liquid film form a huge gas-liquid contact area, which further desulfurizes the flue gas again, further improving the desulfurization efficiency. Under the action of swirling centrifugal force, gas-liquid separation is initially achieved.
[0022] In one feasible implementation, a slag discharge port is provided at the bottom of the slurry tank.
[0023] In one feasible implementation, a slag discharge valve is provided at the slag discharge port.
[0024] In one feasible implementation, a replenishment port is provided above the slurry tank.
[0025] In one feasible implementation, the air oxidation pipeline at the bottom of the slurry tank is connected to the oxidation blower.
[0026] In one feasible implementation, oxygen is introduced into the slurry tank via an oxidation blower to further promote the formation of stable gypsum from calcium sulfite.
[0027] In one feasible implementation, the tower body is mounted on a skirt base.
[0028] In one feasible implementation, a discharge port is provided at the bottom of the tower body.
[0029] In one feasible implementation, the top of the slurry tank is connected to the discharge port via a discharge pipe.
[0030] In one feasible implementation, both the gas-liquid heat exchanger and the liquid-liquid heat exchanger are coated with a corrosion-resistant coating.
[0031] Compared with the prior art, the beneficial effects of this utility model are: This invention provides a limestone-gypsum desulfurization device. After sulfur-containing flue gas enters through the flue gas inlet, the limestone slurry sprayed by the first limestone slurry spray layer extends its flow path via an overflow plate, ensuring sufficient counter-current contact between the rising flue gas and the limestone slurry, achieving the first stage of desulfurization. The flue gas continues to rise and passes through a swirl plate, forming a high-speed rotating upward airflow that contacts the limestone slurry film formed on the guide vanes by the second limestone slurry spray layer, achieving secondary desulfurization and preliminary gas-liquid separation. The desulfurized flue gas rises and is condensed in a gas-liquid heat exchanger, then the liquid droplets are captured and separated by a demister, resulting in clean flue gas being discharged through the flue gas outlet. The desulfurized slurry falls to the bottom of the tower and enters a slurry pool through the discharge port, where calcium sulfite is oxidized to gypsum and discharged through the slag discharge port.
[0032] This invention provides a limestone-gypsum desulfurization device, which is simple and reduces energy waste while improving desulfurization efficiency, thus having significant economic value. Attached Figure Description
[0033] Figure 1 This is a schematic diagram of the structure of a limestone-gypsum desulfurization device according to this utility model; Figure 2 This is a schematic diagram of the overflow plate of a limestone-gypsum desulfurization device according to this utility model; Figure 3 This is a schematic diagram of the swirl plate of a limestone-gypsum desulfurization device according to this utility model.
[0034] Explanation of reference numerals in the attached figures: 1-Tower body; 2-Slurry tank; 11-Flue gas inlet; 12-Flue gas outlet; 13-First limestone slurry spray layer; 14-Second limestone slurry spray layer; 15-Overflow plate; 16-Swirl plate; 17-Demister; 18-Gas-liquid heat exchanger; 19-Discharge port; 21-Oxidation air piping; 22-Liquid-liquid heat exchanger; 23-Slag discharge port; 24-Liquid replenishment port; 151 - Overflow weir; 152 - Through hole; 161-Support component; 162-Flange ring; 163-Guide vane. Detailed Implementation
[0035] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example 1
[0036] See Figures 1 to 3In one embodiment of this application, a limestone-gypsum desulfurization device is provided, wherein a tower body 1 is fixedly mounted on a skirt support, and a discharge port 19 is provided at the bottom of the tower body 1. A first limestone slurry spray layer 13 and a second limestone slurry spray layer 14 are arranged from bottom to top inside the tower body 1. Both the first limestone slurry spray layer 13 and the second limestone slurry spray layer 14 are connected to a slurry tank 2, which is located on the outside of the tower body 1, and the top of the slurry tank 2 is connected to the discharge port 19 through a discharge pipe. A flue gas inlet 11 is provided at the lower part of the tower body 1, located below the first limestone slurry spray layer 13. An overflow plate 15 is staggered along the height direction between the first limestone slurry spray layer 13 and the flue gas inlet 11. Several through holes 152 are evenly provided on the overflow plate 15, and an overflow port is provided on the side of the overflow plate 15 away from the inner wall of the tower body 1. An overflow weir 151 is fixedly connected to the edge of the overflow port. The staggered overflow plates 15 within the tower body 1 guide the limestone slurry spray liquid to form a more uniform distribution within the tower body 1, and extend the flow path of the limestone slurry spray liquid, ensuring sufficient counter-current contact between the rising flue gas and the limestone slurry spray liquid, thereby improving desulfurization efficiency. Through-holes 152 create a water curtain, increasing the contact surface area between the limestone slurry spray liquid and the flue gas. An overflow weir 151 maintains a certain liquid level on the overflow plates 15, guiding the limestone slurry spray liquid to be evenly distributed on the overflow plates 15, ensuring sufficient contact between the flue gas and the limestone slurry spray liquid. When the liquid level is higher than the overflow weir 151, it flows into the next overflow plate 15. A swirl plate 16, mounted on the inner wall of the tower body 1 via a support flange, is installed between the first limestone slurry spray layer 13 and the second limestone slurry spray layer 14. The swirl plate 16 includes a central support member 161, an outer peripheral flange ring 162, and several evenly distributed guide vanes 163 welded between the central support member 161 and the outer peripheral flange ring 162. The guide vanes 163 are inclined. Flue gas passes upward through the guide vanes 163. Due to the fixed inclination angle of the guide vanes 163, the flue gas becomes a high-speed rotating upward airflow. The limestone slurry from the second limestone slurry spray layer 14 forms a liquid film on the guide vanes 163. The upward airflow and the liquid film form a large gas-liquid contact area, further desulfurizing the flue gas and improving the desulfurization efficiency. Under the action of centrifugal force, gas-liquid separation is initially achieved. A flue gas outlet 12 is provided on the upper part of the tower body 1, and a demister 17 is fixedly installed between the second limestone slurry spray layer 14 and the flue gas outlet 12.
[0037] An oxidation air pipeline 21 is installed at the bottom of the slurry tank 2, and the air oxidation pipeline at the bottom of the slurry tank 2 is connected to an oxidation blower. Oxygen is introduced into the slurry tank 2 through the oxidation blower to further promote the formation of stable gypsum from calcium sulfite. A slag discharge port 23 is installed at the bottom of the slurry tank 2, and a slag discharge valve is installed at the slag discharge port 23 to facilitate the cleaning and discharge of gypsum. A liquid replenishment port 24 is installed above the slurry tank 2 to replenish the consumed limestone slurry. A liquid-liquid heat exchanger 22 is installed above the oxidation air pipeline 21 in the slurry tank 2. A gas-liquid heat exchanger 18 is installed between the second limestone slurry spray layer 14 and the demister 17. The inlet end of the gas-liquid heat exchanger 18 is a refrigerant liquid inlet, and the outlet end of the gas-liquid heat exchanger 18 is connected to the inlet end of the liquid-liquid heat exchanger 22 through a circulation pipe.
[0038] The refrigerant liquid absorbs heat from the flue gas through the gas-liquid heat exchanger 18, lowering the flue gas temperature. Excess water vapor in the flue gas is condensed into larger droplets, which are captured and separated by the demister 17, resulting in the discharge of clean flue gas. Simultaneously, the temperature of the refrigerant liquid rises, flowing out from the outlet of the gas-liquid heat exchanger 18 and into the inlet of the liquid-liquid heat exchanger 22, where it continues to exchange heat with the limestone slurry in the slurry pool 2. This preheating of the limestone slurry increases the solubility of the limestone absorbent in the slurry and, after spraying, enhances its absorption capacity for sulfur dioxide in the flue gas, thereby improving absorption efficiency.
[0039] Specific implementation of this utility model: After the sulfur-containing flue gas enters through the flue gas inlet 11, the limestone slurry sprayed by the first limestone slurry spray layer 13 extends the flow path of the limestone slurry spray through the overflow plate 15, so that the rising flue gas and the limestone slurry spray form sufficient counter-current contact, realizing the first stage of desulfurization. After the flue gas continues to rise, it passes through the swirl plate 16, forming a high-speed rotating upward airflow, which contacts the limestone slurry liquid film formed on the guide vanes 163 by the spray of the second limestone slurry spray layer 14, realizing the second desulfurization of the flue gas and the initial gas-liquid separation. The flue gas after the second desulfurization rises and is condensed by the gas-liquid heat exchanger 18, and the liquid droplets are captured and separated by the demister 17, and then the clean flue gas is discharged through the flue gas outlet 12. The slurry that has completed desulfurization falls into the bottom of the tower body 1 and enters the slurry pool 2 through the discharge port 19. In the slurry pool 2, calcium sulfite is oxidized into gypsum and discharged through the slag discharge port 23.
[0040] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. A limestone-gypsum desulfurization device, comprising a tower body, characterized in that, The tower body has a flue gas inlet at the bottom and a flue gas outlet at the top. A first limestone slurry spray layer and a second limestone slurry spray layer are arranged from bottom to top within the tower body. Both the first and second limestone slurry spray layers are connected to a slurry pool. The slurry pool is located on the outside of the tower body. Overflow plates are staggered along the height direction between the first limestone slurry spray layer and the flue gas inlet. A swirl plate is arranged between the first and second limestone slurry spray layers. A demister is fixedly installed between the second limestone slurry spray layer and the flue gas outlet. An oxidation air pipeline is installed at the bottom of the slurry pool. A liquid-liquid heat exchanger is installed above the oxidation air pipeline in the slurry pool. A gas-liquid heat exchanger is installed between the second limestone slurry spray layer and the demister. The inlet end of the gas-liquid heat exchanger is a refrigerant liquid inlet. The outlet end of the gas-liquid heat exchanger is connected to the inlet end of the liquid-liquid heat exchanger via a circulation pipe.
2. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The flue gas inlet is located below the first limestone slurry spray layer.
3. The limestone-gypsum desulfurization device according to claim 1, characterized in that, An overflow port is provided on the side of the overflow plate away from the inner wall of the tower; an overflow weir is fixedly connected to the edge of the overflow port.
4. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The overflow plate has several through holes evenly distributed.
5. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The swirl plate is mounted on the inner wall of the tower body via a support flange.
6. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The swirl plate includes a central support and an outer flange ring, and several evenly distributed guide vanes are welded between the central support and the outer flange ring.
7. The limestone-gypsum desulfurization device according to claim 6, characterized in that, The guide vanes are set at an angle.
8. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The slurry tank is provided with a slag discharge port at the bottom and a liquid replenishment port at the top; the air oxidation pipeline at the bottom of the slurry tank is connected to an oxidation blower.
9. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The tower body is mounted on a skirt base.
10. The limestone-gypsum desulfurization device according to claim 1, characterized in that, The bottom of the tower body is provided with a discharge port; the top of the slurry tank is connected to the discharge port through a discharge pipe.