Flue gas desulfurization device with waste heat recovery structure

Abstract

The utility model provides a kind of flue gas desulfurization device with waste heat recovery structure, belong to flue gas desulfurization technical field, including waste heat recovery structure and desulfurization unit for processing flue gas, waste heat recovery structure includes heat preservation tank, the inner chamber of this heat preservation tank is equipped with shunt cover, the gas outlet pipe and air inlet pipe of shunt cover are all through the tank wall of heat preservation tank and extend to outside, the gas outlet pipe of shunt cover is communicated with the air inlet end of desulfurization unit, shunt cover wall body is all equipped with air jet head, air jet head is all communicated with shunt cover, heat exchange tank is equipped in shunt cover, shunt cover is also equipped with scraper component.The utility model is scraped by automation machinery, continuously removes heat exchange surface impurity, ensure that heat exchange efficiency is not attenuated due to soot, avoid the decline of heat exchange efficiency due to blockage, reduce equipment maintenance frequency simultaneously, realize long-term stable operation of waste heat recovery system.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas desulfurization technology, specifically relating to a flue gas desulfurization device with a waste heat recovery structure. Background Technology

[0002] The emission of sulfur dioxide (SO2) not only leads to acid rain, but also has a negative impact on human health and ecosystems. Currently, the temperature of flue gas after desulfurization is relatively high. Therefore, it is necessary to use flue gas desulfurization devices with waste heat recovery structures to collect waste heat.

[0003] Existing flue gas desulfurization devices with waste heat recovery structures typically use heat exchange to recover and utilize waste heat from flue gas. While this method achieves the goal of waste heat utilization, it still presents some challenges in actual operation. Because the flue gas contains impurities or carbonaceous substances, these components are easily adsorbed onto the inner wall surface of the waste heat recovery structure, which significantly reduces the heat exchange efficiency and affects the long-term stable operation of the equipment. Utility Model Content

[0004] In view of this, the present invention provides a flue gas desulfurization device with a waste heat recovery structure, which can continuously remove impurities from the heat exchange surface through automated mechanical scraping, ensuring that the heat exchange efficiency does not decrease due to ash accumulation, avoiding the decrease in heat exchange efficiency caused by blockage, while reducing the frequency of equipment maintenance and realizing the long-term stable operation of the waste heat recovery system.

[0005] To solve the above-mentioned technical problems, this utility model provides a flue gas desulfurization device with a waste heat recovery structure, including a waste heat recovery structure for treating flue gas and a desulfurization unit. The waste heat recovery structure includes an insulated tank, the inner cavity of which is equipped with a diversion sleeve. The outlet pipe and inlet pipe of the diversion sleeve both penetrate the tank wall of the insulated tank and extend to the outside. The outlet pipe of the diversion sleeve is connected to the inlet end of the desulfurization unit. Jet nozzles are provided on the wall of the diversion sleeve and are connected to the diversion sleeve. A heat exchange tank is provided inside the diversion sleeve, and a scraping component is also provided inside the diversion sleeve. That is, through automated mechanical scraping, impurities on the heat exchange surface are continuously removed to ensure that the heat exchange efficiency does not decrease due to ash accumulation, avoid the decrease in heat exchange efficiency due to blockage, reduce the frequency of equipment maintenance, and achieve long-term stable operation of the waste heat recovery system.

[0006] The scraping assembly includes an annular groove located at the lower end of the inner arc surface of the distribution sleeve. A scraper is rotatably connected in the annular groove. The scraper contacts the outer arc surface of the heat exchange tank and the inner arc surface of the distribution sleeve, thus cleaning the attached impurities.

[0007] The scraping assembly also includes a cover plate threaded to the bottom of the insulated tank, allowing staff to quickly open it for cleaning.

[0008] It also includes a drive assembly, which includes a toothed ring located at the lower end of the outer arc surface of the scraper. The toothed ring is located in an annular groove, and a gear is rotatably connected in the annular groove. The outer arc surface of the diverter sleeve has a through opening that matches the gear. The gear meshes with the toothed ring, thus achieving rapid transmission.

[0009] The drive assembly also includes a motor installed at the bottom of the insulated tank. The output shaft of the motor is fixedly connected to one end of the gear, thus providing a drive source for the gear.

[0010] The lower end of the inner arc surface of the diverter sleeve is inclined downward from the outside to the inside, which allows the fallen impurities to flow obliquely to the bottom.

[0011] The desulfurization unit includes a desulfurization tower, the inlet of which is connected to the outlet pipe of the diversion sleeve. A spray layer is provided in the inner cavity of the desulfurization tower above the inlet, and a demister is provided at the top of the inner cavity of the desulfurization tower, thus realizing rapid desulfurization of flue gas.

[0012] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0013] 1. After desulfurization treatment by the flue gas desulfurization structure, the high-temperature flue gas enters the inner cavity of the distribution sleeve through the exhaust pipe. Then, it is evenly dispersed by uniformly distributed jet nozzles, thereby exchanging heat with the heat exchange tank to achieve waste heat recovery. During this process, particulate impurities or carbonaceous materials carried in the flue gas may adhere to the surface of the heat exchange tank and the distribution sleeve. At this time, the drive scraper rotates along the annular groove, so that its scraping blade continuously removes the impurities accumulated on the surface of the heat exchange tank and the distribution sleeve. Through automated mechanical scraping, impurities on the heat exchange surface are continuously removed, ensuring that the heat exchange efficiency does not decrease due to ash accumulation, avoiding the decrease in heat exchange efficiency due to blockage, reducing the frequency of equipment maintenance, and achieving long-term stable operation of the waste heat recovery system.

[0014] 2. The flue gas is introduced into the desulfurization tower. After being pressurized by an external booster fan, the raw flue gas enters the absorption tower for desulfurization through the inlet flue. The purified flue gas passes through a demister and wet electrostatic precipitator to remove droplets, and then enters the chimney for discharge through the outlet flue. The spray layer sprays limestone slurry downwards, which fully contacts the flue gas flowing upwards to absorb SO2. The demister, located at the top of the absorption tower, removes slurry droplets carried by the flue gas. The slurry at the bottom of the tower is transported to the spray layer by a circulating pump, sprayed out by the spray layer, and falls into the tower bottom, thus circulating. The limestone slurry is made by mixing limestone powder and water, stored in an external slurry tank, and then transported by a transfer pump for recycling. At the bottom, the gypsum slurry is initially concentrated by a hydrocyclone, and then dehydrated by a vacuum belt filter to produce gypsum byproduct with a water content of <10%. At the same time, air is blown into the bottom of the absorption tower by an oxidation fan to ensure that calcium sulfite is fully oxidized into gypsum.

[0015] 3. When the motor starts, its output shaft rotates, driving the gear to rotate. When the gear rotates, it drives the scraper to rotate along the annular groove through the toothed ring that meshes with it, so that the scraper blade continuously removes the impurities accumulated on the surface of the heat exchange tank and the distribution jacket.

[0016] 4. The inclined surface design at the lower end of the inner wall of the diversion sleeve allows the fallen impurities to flow obliquely to the bottom and be discharged through the detachable cover plate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of a flue gas desulfurization device with a waste heat recovery structure according to the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0020] Figure 4 This is an enlarged structural diagram of point B in this utility model;

[0021] Figure 5 This is a schematic diagram of the flue gas desulfurization unit structure of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 100, Insulation tank; 200, Desulfurization tower kettle; 201, Spray layer; 202, Demister; 300, Diverter sleeve; 301, Jet nozzle; 302, Heat exchange tank; 303, Annular groove; 304, Scraper; 305, Cover plate; 400, Toothed ring; 401, Gear; 402, Motor. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the appendices of the embodiments of this utility model. Figure 1-5 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0024] This embodiment provides a flue gas desulfurization device equipped with a waste heat recovery structure, such as... Figure 1-4The diagram shows a waste heat recovery structure and a desulfurization unit for treating flue gas. The waste heat recovery structure includes an insulated tank 100, the inner cavity of which is provided with a diversion sleeve 300. The outlet pipe and inlet pipe of the diversion sleeve both penetrate the tank wall of the insulated tank and extend to the outside. The outlet pipe of the diversion sleeve is connected to the inlet end of the desulfurization unit. The diversion sleeve wall is provided with jet nozzles 301, which are all connected to the diversion sleeve. A heat exchange tank 302 is provided inside the diversion sleeve. A scraping assembly is also provided inside the diversion sleeve. The scraping assembly includes an annular groove 303 located at the lower end of the inner arc surface of the diversion sleeve. A scraper 304 is rotatably connected in the annular groove. The scraper contacts the outer arc surface of the heat exchange tank and the inner arc surface of the diversion sleeve. The scraping assembly also includes a cover plate 305 threadedly connected to the bottom of the insulated tank 100. The lower end of the inner arc surface of the diversion sleeve is inclined downward from the outside to the inside.

[0025] After desulfurization, the high-temperature flue gas enters the inner cavity of the diversion sleeve 300 through the exhaust pipe, and is then evenly dispersed by the uniformly distributed jet nozzles 301, thereby exchanging heat with the heat exchange tank 302 to achieve waste heat recovery. During this process, particulate impurities or carbonaceous materials carried in the flue gas may adhere to the surface of the heat exchange tank 302 and the diversion sleeve 300. At this time, the drive scraper 304 rotates along the annular groove 303, so that its scraping blade continuously removes the impurities accumulated on the surface of the heat exchange tank 302 and the diversion sleeve 300, and discharges them through the detachable cover plate 305. Through automated mechanical scraping, impurities on the heat exchange surface are continuously removed, ensuring that the heat exchange efficiency does not decrease due to ash accumulation, avoiding the decrease in heat exchange efficiency due to blockage, reducing the frequency of equipment maintenance, and achieving long-term stable operation of the waste heat recovery system.

[0026] like Figure 2-4 As shown, it also includes a drive assembly, which includes a toothed ring 400 disposed at the lower end of the outer arc surface of the scraper 304. The toothed ring is located in an annular groove, and a gear 401 is rotatably connected in the annular groove. The outer arc surface of the diverter sleeve is provided with a through opening adapted to the gear. The gear meshes with the toothed ring. The drive assembly also includes a motor 402 installed at the lower end of the heat preservation tank 100. The output shaft of the motor is fixedly connected to one end of the gear.

[0027] When the motor 402 starts, its output shaft rotates to drive the gear 401 to rotate. When the gear 401 rotates, it drives the scraper 304 to rotate along the annular groove 303 through the toothed ring 400 that meshes with it, thereby achieving the effect of rapid driving.

[0028] like Figure 2-4 As shown, the lower end of the inner arc surface of the diversion sleeve 300 is inclined downward from the outside to the inside. The inclined surface design of the lower end of the inner wall of the diversion sleeve 300 allows the fallen impurities to flow obliquely to the bottom.

[0029] like Figure 5As shown, the desulfurization unit includes a desulfurization tower 200. The inlet end of the desulfurization tower is connected to the outlet pipe of the diversion sleeve. A spray layer 201 is provided in the inner cavity of the desulfurization tower 200 above the inlet end. A demister 202 is provided at the top of the inner cavity of the desulfurization tower 200.

[0030] Flue gas waste heat recovery and flue gas desulfurization include the following steps:

[0031] S1: Flue gas is introduced into the diversion sleeve 300 and injected into the space between the diversion sleeve 300 and the heat exchange tank 302 through multiple jet nozzles 301 for heat exchange.

[0032] S2: Motor 402 starts and drives scraper 304 to rotate along annular groove 303 through gear 401 and toothed ring 400, continuously removing impurities accumulated on the surface of heat exchange tank 302 and distribution sleeve 300, ensuring that heat exchange efficiency does not decrease due to ash accumulation, and avoiding heat exchange efficiency reduction due to blockage.

[0033] S3: After heat exchange, the sulfur-containing flue gas is pressurized by a booster fan and then transported to the desulfurization tower bottom 200 through the inlet flue. S4: Inside the desulfurization tower bottom 200, a circulating pump transports the limestone slurry from the bottom slurry zone to the spray layer 201 and sprays it downwards. The sulfur-containing flue gas, after heat exchange, flows counter-currently upwards through the spray area, fully contacting and reacting with the limestone slurry to remove SO2 from the flue gas.

[0034] S3: The clean flue gas after desulfurization rises to the top of the desulfurization tower bottom 200 and passes through the demister 202 in sequence to remove the slurry droplets carried in the flue gas;

[0035] S4: Purified flue gas emission: The purified flue gas after demisting is discharged from the desulfurization tower kettle 200 through the outlet flue;

[0036] S5: Inject oxidizing air into the slurry zone 200 of the desulfurization tower to force the calcium sulfite generated by the desulfurization reaction to oxidize into gypsum;

[0037] S6: Limestone powder and water are mixed in a slurry tank to prepare limestone slurry, and the limestone slurry is then supplied to the bottom slurry zone of the absorption tower via a delivery pump;

[0038] S7: Discharge the gypsum-rich slurry generated in the bottom slurry zone of the absorption tower and transport it to the gypsum dewatering system;

[0039] S8: Pass the discharged gypsum slurry into a hydrocyclone for preliminary concentration and separation;

[0040] S9: The gypsum slurry concentrated by the hydrocyclone is transported to the vacuum belt filter for dewatering treatment to obtain gypsum filter cake with a moisture content of less than 10%.

[0041] S10: The dehydrated gypsum filter cake is transported to a gypsum storage device for storage;

[0042] S11: Collect wastewater generated during the operation of the desulfurization system, transport it to the wastewater treatment system to remove pollutants such as heavy metals and suspended solids, and discharge or reuse it after treatment to meet the standards.

[0043] The working principle of the flue gas desulfurization device with a waste heat recovery structure provided by this utility model is as follows: Flue gas enters the inner cavity of the diversion sleeve 300, and is then evenly dispersed by the uniformly distributed jet nozzles 301, thereby exchanging heat with the heat exchange tank 302 to achieve waste heat recovery. During this process, particulate impurities or carbonaceous substances carried in the flue gas may adhere to the surface of the heat exchange tank 302 and the diversion sleeve 300. At this time, the motor 402 starts, and its output shaft rotates to drive the gear 401 to rotate. When the gear 401 rotates, it drives the scraper 304 to rotate along the annular groove 303 through the toothed ring 400 that meshes with it, thereby making its scraping blade rotate. The system continuously removes impurities accumulated on the surfaces of heat exchange tank 302 and diversion sleeve 300. Simultaneously, the inclined design at the lower end of the inner wall of diversion sleeve 300 allows fallen impurities to flow obliquely to the bottom and be discharged through a removable cover plate 305. Automated mechanical scraping continuously removes impurities from the heat exchange surface, ensuring that heat exchange efficiency does not decrease due to ash accumulation and preventing a decline in heat exchange performance caused by blockage. This also reduces equipment maintenance frequency and ensures long-term stable operation of the waste heat recovery system. The flue gas after waste heat recovery is pressurized by a booster fan and then transported to the desulfurization tower 200 through the inlet flue. Inside the desulfurization tower 200, a circulating pump is used to remove the slurry from the tower slurry zone. The limestone slurry is conveyed to the spray layer 201 and sprayed downwards. After heat exchange, the sulfur-containing flue gas flows counter-currently upwards through the spray area, fully contacting and reacting with the limestone slurry to remove SO2 from the flue gas. The clean flue gas after desulfurization rises to the top of the desulfurization tower 200 and passes through the demister 202 to remove slurry droplets carried in the flue gas, purifying the flue gas before emission. The clean flue gas after demisting is discharged from the desulfurization tower 200 through the outlet flue. Oxidizing air is blown into the slurry zone of the desulfurization tower 200 to forcibly oxidize the calcium sulfite generated in the desulfurization reaction into gypsum. Limestone powder and water are mixed in the slurry tank to prepare limestone slurry, which is then pumped through a conveying pump. The limestone slurry is added to the slurry zone of the absorber tower. The gypsum-rich slurry generated in the slurry zone of the absorber tower is discharged and transported to the gypsum dewatering system. The discharged gypsum slurry is passed into a hydrocyclone for preliminary concentration and separation. The gypsum slurry concentrated by the hydrocyclone is transported to a vacuum belt filter for dewatering treatment to obtain a gypsum filter cake with a moisture content of less than 10%. The dewatered gypsum filter cake is transported to a gypsum storage device for storage. Wastewater generated during the operation of the desulfurization system is collected and transported to the wastewater treatment system to remove pollutants such as heavy metals and suspended solids. After treatment to meet the standards, it is discharged or reused.

[0044] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A flue gas desulfurization device equipped with a waste heat recovery structure, characterized in that: The system includes a waste heat recovery structure for treating flue gas and a desulfurization unit. The waste heat recovery structure includes an insulated tank (100), the inner cavity of which is provided with a diversion sleeve (300). The outlet pipe and inlet pipe of the diversion sleeve both penetrate the tank wall of the insulated tank and extend to the outside. The outlet pipe of the diversion sleeve is connected to the inlet end of the desulfurization unit. The wall of the diversion sleeve is provided with jet nozzles (301), which are all connected to the diversion sleeve. A heat exchange tank (302) is provided inside the diversion sleeve. A scraping assembly is also provided inside the diversion sleeve.

2. The flue gas desulfurization device with a waste heat recovery structure as described in claim 1, characterized in that: The scraping assembly includes an annular groove (303) disposed at the lower end of the inner arc surface of the flow divider sleeve, and a scraper (304) is rotatably connected in the annular groove. The scraper contacts the outer arc surface of the heat exchange tank and the inner arc surface of the flow divider sleeve.

3. A flue gas desulfurization device with a waste heat recovery structure as described in claim 1, characterized in that: The scraping assembly also includes a cover plate (305) threaded to the bottom of the insulated tank (100).

4. A flue gas desulfurization device with a waste heat recovery structure as described in claim 2, characterized in that: It also includes a drive assembly, which includes a toothed ring (400) disposed at the lower end of the outer arc surface of the scraper (304). The toothed ring is located in an annular groove, and a gear (401) is rotatably connected in the annular groove. The outer arc surface of the diverter sleeve is provided with a through opening adapted to the gear, and the gear is meshed with the toothed ring.

5. A flue gas desulfurization device with a waste heat recovery structure as described in claim 4, characterized in that: The drive assembly also includes a motor (402) installed at the lower end of the insulated tank (100), the output shaft of which is fixedly connected to one end of a gear.

6. A flue gas desulfurization device with a waste heat recovery structure as described in claim 1, characterized in that: The lower end of the inner arc surface of the diversion sleeve is inclined downward from the outside to the inside.

7. The flue gas desulfurization device with a waste heat recovery structure as described in claim 1, characterized in that: The desulfurization unit includes a desulfurization tower (200), the inlet of which is connected to the outlet pipe of the diversion sleeve. A spray layer (201) is provided in the inner cavity of the desulfurization tower (200) above the inlet. A demister (202) is provided at the top of the inner cavity of the desulfurization tower (200).

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