Green electricity refrigeration flue gas deep water extraction system
Patent Information
- Application Number
- CN202522618024.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-10
AI Technical Summary
烟气中的含湿量与烟气压力和温度有关，目前的烟气回收水技术主要采用直接冷凝法或间接冷凝法，利用空气将烟气冷却至环境温度以上，烟气温度降低，水分析出被收集从而达到烟气提水的目的，该种方法受环境温度的限制，提水量有限
[0010]与现有技术相比，本实用新型具有以下有益效果：本实用新型利用电网低负荷时的绿电制冷，循环介质与冷库换热后进入烟道中，通过烟气提水装置与脱硫后烟气换热，烟气温度下降，含湿量下降，析出冷凝水，部分污染物随同冷凝水一同排出，同时达到烟气深度净化的目的，降温后的烟气排入烟囱，升温后的循环介质回到冷库，与冷库换热降温后进入下一个循环。从提水装置中排出的冷凝水经pH调节系统后进入冷凝水箱，一部分回到脱硫系统，作为脱硫系统补充水，另一部分进入电厂其他用水点，作为电厂补水。
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Figure CN224904984U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a green electric cooling flue gas deep water lifting system. Background Technology
[0002] Coal-fired power plants use coal as fuel. The flue gas produced after coal combustion, after dust removal, denitrification, and desulfurization, contains a large amount of water and low-grade heat. Recovering water from the desulfurized flue gas is an important water-saving measure. The moisture content in flue gas is related to its pressure and temperature. Current flue gas water recovery technologies mainly employ direct condensation or indirect condensation methods. These methods utilize air to cool the flue gas to above ambient temperature. As the flue gas temperature decreases, water is precipitated and collected, thus achieving the purpose of water extraction from the flue gas. However, this method is limited by ambient temperature, resulting in a limited water recovery rate.
[0003] As the proportion of renewable energy in my country's power grid increases, the problem of mismatch between renewable energy generation and grid user load becomes more prominent. Utility Model Content
[0004] The technical problem to be solved by this utility model is: how to increase the water extraction volume without being limited by the ambient temperature during the flue gas water recovery process, and therefore provides a green electric cooling flue gas deep water extraction system.
[0005] To solve the above problems, this utility model is achieved through the following technical solution: A green electric cooling flue gas deep water extraction system includes a desulfurization tower with a clean flue duct at one end, which is connected to a chimney at the other end. A bypass flue is provided on the clean flue duct, and the other end of the bypass flue is connected to a flue gas water extraction device. A flue gas water extraction post-flue duct is provided on the outlet side of the flue gas water extraction device, which is also connected to the chimney. The liquid outlet of the flue gas water extraction device is connected to a condensate collection pipe, and the other end of the condensate collection pipe is connected to a condensate tank. The flue gas water lifting device is equipped with a circulating water return pipe and a circulating water supply pipe. The cooling water, after being cooled by the cooling equipment, enters the flue gas water lifting device through the circulating water supply pipe. After heat exchange in the flue gas water lifting device, it re-enters the cooling equipment through the circulating water return pipe.
[0006] The cooling equipment is a cold storage facility, which is powered by green electricity.
[0007] A pH adjustment device is installed between the flue gas water extraction device and the condensate tank. The outlet of the condensate collection pipe is connected to the pH adjustment device, and the outlet of the pH adjustment device is connected to the condensate tank through the pH adjustment device outlet pipe.
[0008] The outlet of the condensate tank has one route connected to the desulfurization tower via a condensate return pipe; the other route connects to condensate pipes leading to other water usage points.
[0009] The original flue damper is installed on the clean flue; the flue gas water lifting system damper is installed on the bypass flue.
[0010] Compared with existing technologies, this invention has the following advantages: This invention utilizes green electricity for cooling during periods of low grid load. The circulating medium exchanges heat with the cold storage before entering the flue gas duct. Through a flue gas water lifting device, it exchanges heat with the desulfurized flue gas, causing the flue gas temperature and moisture content to decrease, resulting in condensate. Some pollutants are discharged along with the condensate, achieving deep purification of the flue gas. The cooled flue gas is discharged into the chimney, while the heated circulating medium returns to the cold storage, exchanges heat with it again, and then enters the next cycle. The condensate discharged from the water lifting device passes through a pH adjustment system and enters a condensate tank. Part of it returns to the desulfurization system as makeup water, and the other part enters other water usage points in the power plant as makeup water.
[0011] Therefore, this utility model is not limited by ambient temperature and can achieve deep cooling water extraction from flue gas below ambient temperature. It is suitable for areas with scarce water resources and insufficient water quotas. It is also suitable for deep flue gas purification and units with higher requirements for environmental protection indicators. It can also be used for the treatment of colored plumes and chimney rain to meet the emission requirements of special high humidity flue gas. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation
[0013] 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.
[0014] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0015] like Figure 1As shown, a green electric cooling flue gas deep water extraction system includes a desulfurization tower 1, a clean flue duct 101 on the desulfurization tower 1, and the other end of the clean flue duct 101 connected to a chimney 3; a bypass flue duct 102 is opened on the clean flue duct 101, and the other end of the bypass flue duct 102 is connected to a flue gas water extraction device 5; a flue gas water extraction post-flue duct 103 is provided on the outlet side of the flue gas water extraction device 5, and the flue gas water extraction post-flue duct 103 is also connected to the chimney 3; the liquid outlet of the flue gas water extraction device 5 is connected to a condensate collection pipe 106, and the other end of the condensate collection pipe 106 is connected to a condensate tank 7.
[0016] The flue gas water extraction device 5 is equipped with a circulating water return pipe 104 and a circulating water supply pipe 105. Cooling water, after being cooled by the cooling equipment 8, enters the flue gas water extraction device 5 through the circulating water supply pipe 105. After heat exchange within the flue gas water extraction device 5, it re-enters the cooling equipment 8 through the circulating water return pipe 104. This cooling equipment can be equipment such as a cold storage facility, which is powered by green electricity.
[0017] Even better, a pH adjustment device 6 is installed between the flue gas water extraction device 5 and the condensate tank 7. Specifically, the outlet of the condensate collection pipe 106 is connected to the pH adjustment device 6, and the outlet of the pH adjustment device 6 is connected to the condensate tank 7 via the pH adjustment device outlet pipe 107. Even better, the outlet of the condensate tank 7 is connected to the desulfurization tower 1 via a return condensate pipe 108 to the desulfurization tower; and to a condensate pipe 109 leading to other water usage points.
[0018] It should be noted that the original flue damper 2 is installed on the clean flue 101; and the flue gas water lifting system damper 4 is installed on the bypass flue 102.
[0019] The working principle of this utility model is as follows: The moisture content in flue gas is related to its pressure and temperature. Lowering the flue gas temperature reduces its moisture content, causing water to be released and thus achieving the purpose of flue gas water extraction. Since some pollutants are discharged along with the water, the process of flue gas water extraction also achieves the goal of deep flue gas purification. After the induced draft fan, the flue gas enters the desulfurization tower 1 and is discharged into the chimney 3 along the clean flue duct 101. At this time, the original flue duct damper 2 is open, the flue gas water extraction system damper 4 is closed, and the flue gas water extraction device 5 is not working.
[0020] When the cooling equipment 8 has green electricity input and cooling capacity, the original flue damper 2 is closed and the flue gas lifting system damper 4 is opened. The flue gas enters the flue gas lifting device 5 along the bypass flue 102 to cool down, and then is discharged into the chimney 3 along the flue gas lifting and water lifting flue 103.
[0021] The flue gas water extraction device 5 is a surface heat exchanger. The circulating medium (such as circulating water) enters the flue gas water extraction device 5 through the circulating water supply pipe 105 after heat exchange and cooling from the cooling equipment 8. The flue gas exchanges heat with the circulating water, causing a large amount of water to precipitate and be collected at the bottom of the flue gas water extraction device 5. The circulating water, after heat exchange, returns to the cooling equipment 8 through the circulating water return pipe 104 for the next cycle of heat absorption and release. The saturated flue gas, now cooled and precipitated with water, is then discharged into the chimney 3 through the flue gas water extraction duct 103. This invention includes green electricity ice making and other green electricity refrigeration methods; the circulating medium can be water or other heat exchange media.
[0022] Since the temperature of the flue gas after heat exchange is not limited by the ambient temperature but only affected by the temperature of the circulating medium, the flue gas can achieve deep water extraction at a temperature lower than the ambient temperature.
[0023] After being discharged from the flue gas water extraction device 5, the condensate enters the pH adjustment device 6 along the condensate collection pipe 106. After purification and pH adjustment, it enters the condensate tank 7 through the pH adjustment device outlet pipe 107 for storage. Part of the condensate is returned to the desulfurization system through the desulfurization tower condensate pipe 108 as makeup water for the desulfurization system, which can achieve zero makeup water for the desulfurization system. The other part can be sent to other water points through the condensate pipe 109 to other water points, which helps to achieve zero water consumption of the power plant according to the changes in green electricity load.
[0024] This invention is not limited by ambient temperature and can achieve deep cooling and water extraction from flue gas at temperatures below ambient temperature. It is suitable for areas with scarce water resources and insufficient water quotas. It is also suitable for deep flue gas purification and units with higher requirements for environmental protection indicators. It can also be used for the treatment of colored plumes and chimney rain, and meet the emission requirements of special high humidity flue gas.
[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.
Claims
1. A green electricity-cooled flue gas deep water extraction system, characterized in that: The system includes a desulfurization tower (1), on which a clean flue (101) is opened, and the other end of the clean flue (101) is connected to the chimney (3); a bypass flue (102) is opened on the clean flue (101), and the other end of the bypass flue (102) is connected to the flue gas water lifting device (5); a flue gas water lifting post-flue (103) is provided on the gas outlet side of the flue gas water lifting device (5), and the flue gas water lifting post-flue (103) is also connected to the chimney (3); the liquid outlet of the flue gas water lifting device (5) is connected to a condensate collection pipe (106), and the other end of the condensate collection pipe (106) is connected to a condensate tank (7); The flue gas water lifting device (5) is equipped with a circulating water return pipe (104) and a circulating water supply pipe (105). The cooling water after being cooled by the cooling equipment (8) enters the flue gas water lifting device (5) through the circulating water supply pipe (105). After heat exchange in the flue gas water lifting device (5), it re-enters the cooling equipment (8) through the circulating water return pipe (104).
2. The green electric cooling flue gas deep water lifting system according to claim 1, characterized in that: The cooling equipment is a cold storage facility, which is powered by green electricity.
3. The green electric cooling flue gas deep water lifting system according to claim 1, characterized in that: A pH adjustment device (6) is provided between the flue gas water lifting device (5) and the condensate tank (7). The outlet of the condensate collection pipe (106) is connected to the pH adjustment device (6), and the outlet of the pH adjustment device (6) is connected to the condensate tank (7) through the pH adjustment device outlet pipe (107).
4. The green electric cooling flue gas deep water lifting system according to claim 1, characterized in that: The outlet of the condensate tank (7) is connected to the desulfurization tower (1) via a condensate return pipe (108); and another pipe is connected to the condensate pipe (109) to other water points.
5. The green electric cooling flue gas deep water lifting system according to claim 1, characterized in that: An original flue damper (2) is installed on the clean flue (101); a flue gas water lifting system damper (4) is installed on the bypass flue (102).