Flue gas circulating treatment device of circular cooler

Abstract

The invention relates to the technical field of energy conservation and pollution reduction, and provides a circular cooler flue gas circulation treatment device which comprises a sintering chamber, the sintering chamber is provided with a sintering cavity, and the sintering cavity is provided with a high-sulfur flue gas outlet; the circular cooler is provided with a cooling cavity, the air bellow is arranged on the circular cooler and provided with a gas mixing cavity, the high-sulfur flue gas outlet leads to the gas mixing cavity, the gas mixing cavity is communicated with the cooling cavity and provided with an air inlet, and the gas mixing cavity is used for being communicated with the outside through the air inlet. According to the technical scheme, flue gas with most heat loss after waste heat recovery is introduced into the cooling cavity and exchanges heat with high-temperature sintered ore, secondary utilization of waste heat is achieved, and the energy utilization rate is increased. And compared with a traditional process, the heat efficiency of the system can be improved, and energy consumption in the production process is reduced. The technical problem that in the prior art, the treatment efficiency of flue gas generated in the sintering process is insufficient is solved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of energy conservation and pollution reduction, and more specifically, to a flue gas circulation treatment device for a ring cooler. Background Art

[0002] In the iron and steel sintering process, sintering flue gas usually contains high concentrations of sulfur oxides (SO 2 , SO 3 ), nitrogen oxides (NO X ), and carbon monoxide (CO) and other pollutants. On the one hand, to meet environmental protection requirements and achieve ultra-low emissions, existing technologies generally choose the treatment route of "bag dust removal - wet desulfurization - denitrification"; on the other hand, the temperature of the flue gas after wet desulfurization will drop to about 80°C, resulting in the subsequent denitrification process having to be reheated to about 300 - 350°C, which not only causes high energy consumption but also has an adverse impact on system efficiency.

[0003] In addition, according to the conventional scheme, when directly performing SCR denitrification on the flue gas after wet desulfurization, the CO in the flue gas still needs to be treated via SCR simultaneously with NO X , the system load is heavy, and the overall energy consumption and operating costs increase. Conventional technologies often lack fine management of the drying and heating processes and cannot fully utilize waste heat equipment to synergistically remove some pollutants in the flue gas. In view of this, there is an urgent need in the industry for an efficient flue gas treatment method: which can not only use waste heat recovery devices such as sintering ring coolers to heat the flue gas, but also synergistically remove some CO and NO X during the heating and heat exchange processes, reduce the treatment load and energy consumption of subsequent SCR, thereby improving the energy utilization efficiency and environmental protection benefits of the entire iron and steel sintering process. Summary of the Invention

[0004] To overcome the above defects, embodiments of the present disclosure provide a flue gas circulation treatment device for a ring cooler, which solves the technical problem of insufficient treatment efficiency of the flue gas generated during the sintering process in the prior art.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a flue gas circulation treatment device for a ring cooler, including: A sintering chamber, the sintering chamber having a sintering cavity, and the sintering cavity having a high-sulfur flue gas outlet; A ring cooler, the ring cooler having a cooling cavity, A wind box, the wind box being provided on the ring cooler, the wind box having a gas mixing cavity, the high-sulfur flue gas outlet leading to the gas mixing cavity, the gas mixing cavity communicating with the cooling cavity, the gas mixing cavity having an air inlet, and the gas mixing cavity being used to communicate with the outside through the air inlet.

[0006] For example, a kind of ring cooler flue gas circulation treatment device provided by at least one embodiment of the present disclosure, there are several air boxes, and several said air boxes are arranged in a circular arrangement along the ring cooler. The kind of ring cooler flue gas circulation treatment device further includes: A first air duct, the first air duct is used to connect the ring cooler and the air box, and is used to connect the high-sulfur flue gas outlet and several said gas mixing chambers; A desulfurization device, the sintering chamber, the desulfurization device and the gas mixing chamber are sequentially connected through the first air duct.

[0007] For example, a kind of ring cooler flue gas circulation treatment device provided by at least one embodiment of the present disclosure, the kind of ring cooler flue gas circulation treatment device further includes: A dust removal device; A denitration device, the cooling chamber, the dust removal device and the denitration device are sequentially connected, and the denitration device is used to communicate with the outside.

[0008] For example, a kind of ring cooler flue gas circulation treatment device provided by at least one embodiment of the present disclosure, the cooling chamber is divided into a high-temperature area, a medium-temperature area and a low-temperature area. The cooling chamber has several cooling air inlets and several cooling air outlets. Several said gas mixing chambers are correspondingly connected to the cooling chamber through several said cooling air inlets. The kind of ring cooler flue gas circulation treatment device further includes: A second air duct, the second air duct connects several said cooling air outlets corresponding to the high-temperature area with the dust removal device; A heat exchanger, the heat exchanger is arranged on the second air duct. Several said cooling air outlets corresponding to the high-temperature area, the heat exchanger and the dust removal device are sequentially connected through the second air duct, and the heat collected by the heat exchanger leads to the denitration device.

[0009] For example, a kind of ring cooler flue gas circulation treatment device provided by at least one embodiment of the present disclosure, the kind of ring cooler flue gas circulation treatment device further includes: A third air duct, the third air duct connects several cooling air outlets corresponding to the medium-temperature area and the cooling air outlets corresponding to the low-temperature area with the dust removal device.

[0010] For example, a kind of ring cooler flue gas circulation treatment device provided by at least one embodiment of the present disclosure, the kind of ring cooler flue gas circulation treatment device further includes: A separator is provided inside the bellow, which divides the gas mixing chamber into an inner air chamber and an outer flue gas chamber. The outer flue gas chamber is located around the inner air chamber. The air inlet leads to the inner air chamber. The outer flue gas chamber has a flue gas inlet, and the high-sulfur flue gas outlet is communicated with the outer flue gas chamber through the flue gas inlet. The outer flue gas chamber is used to lead to the inner air chamber, and the inner air chamber is communicated with the cooling gas inlet.

[0011] For example, in a flue gas circulation treatment device for a ring cooler provided by at least one embodiment of the present disclosure, there is a communication port between the inner air chamber and the outer flue gas chamber. The flue gas circulation treatment device for a ring cooler further includes: A sliding stopper, which is slidably arranged in the gas mixing chamber and is used to block or cancel blocking the communication port after sliding.

[0012] For example, in a flue gas circulation treatment device for a ring cooler provided by at least one embodiment of the present disclosure, the sliding stopper has a pushed portion, and the pushed portion is configured such that after the air pressure in the outer flue gas chamber increases, it pushes the pushed portion, driving the sliding stopper to slide and gradually cancel blocking the communication port.

[0013] For example, in a flue gas circulation treatment device for a ring cooler provided by at least one embodiment of the present disclosure, the flue gas circulation treatment device for a ring cooler further includes: A first elastic member, one end of which acts on the bellow and the other end acts on the sliding stopper, providing a force for the sliding stopper to slide back in the direction of blocking the communication port.

[0014] For example, in a flue gas circulation treatment device for a ring cooler provided by at least one embodiment of the present disclosure, the flue gas circulation treatment device for a ring cooler further includes: A regulating valve, which is arranged in the first air duct. One side of the regulating valve in the first air duct leads to the high-temperature zone, and the other side of the regulating valve in the first air duct leads to the medium-temperature zone and the low-temperature zone. The regulating valve is used to regulate the amount of high-sulfur flue gas leading to the high-temperature zone and the amount of high-sulfur flue gas leading to the medium-temperature zone and the low-temperature zone.

[0015] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, on the one hand, by introducing the flue gas with most of the heat loss after waste heat recovery into the cooling chamber for heat exchange with the high-temperature sintered ore, the secondary utilization of waste heat is realized, and the energy utilization rate is improved. Compared with the traditional process, the system thermal efficiency can be increased, and the energy consumption in the production process is reduced. On the other hand, by utilizing the high temperature of the sintered ore, the catalytic reaction between CO in the flue gas and calcium ferrite is promoted, and at the same time, the synergistic reduction of NOx and CO is realized, and the pollutant removal efficiency is improved. Before entering the subsequent SCR denitration process, the NOx content is reduced in advance, the SCR denitration burden is alleviated, the overall denitration efficiency is improved, and the pollutant emissions are effectively reduced. At the same time, by controlling the temperature and flow rate of the flue gas entering the cooling chamber, the sintered ore can be preliminarily cooled, the amount of additional introduced air is reduced, and thus the generation of waste gas containing air pollutants can be reduced, the pressure on the subsequent denitration and dust removal equipment is alleviated, the energy consumption and the subsequent pollution treatment cost are reduced, and the economic benefits of the enterprise are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments of the present disclosure. Obviously, the following-described drawings are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the exemplary embodiments of the present disclosure and these drawings.

[0017] Figure 1 It is a schematic diagram of the equipment process of a ring cooler flue gas circulation treatment device in an embodiment of the present disclosure; Figure 2 For Figure 1 the structural schematic diagram of the ring cooler in the embodiment of Figure 3 For Figure 1 the internal structural schematic diagram of the ring cooler in the embodiment of Figure 4 For Figure 1 the internal structural schematic diagram of the air box in the embodiment of Figure 5 For Figure 1 another perspective internal structural schematic diagram of the air box in the embodiment of Figure 6 For Figure 1 the partial internal structural schematic diagram of the air box with the connecting port in the connected state in the embodiment of

[0018] In the figure: sintering chamber - 1, sintering cavity - 101, high - sulfur flue gas outlet - 102, annular cooler - 2, cooling cavity - 201, high - temperature zone - 202, medium - temperature zone - 203, low - temperature zone - 204, cooling gas inlet - 205, cooling gas outlet - 206, air box - 3, gas mixing cavity - 301, air inlet - 302, inner air cavity - 303, outer flue gas cavity - 304, flue gas inlet - 305, communication port - 306, first air duct - 4, desulfurization device - 5, dust removal device - 6, denitration device - 7, second air duct - 8, heat exchanger - 9, third air duct - 10, partition - 11, sliding stopper - 12, pushed part - 1201, first elastic member - 13, regulating valve - 14. Detailed implementation manners

[0019] The following further elaborates the present disclosure in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are merely used to explain the present disclosure, rather than limiting the present disclosure.

[0020] To make the drawings concise, only the parts related to the disclosure are schematically shown in each drawing, and they do not represent the actual structure of the product. Additionally, to make the drawings concise and easy to understand, for components with the same structure or function in some drawings, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also can mean "more than one" situation, and "several" includes "two" and "more than two".

[0021] In this article, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0022] In the present disclosure, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height than the second feature.

[0023] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure.

[0024] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0025] As Figures 1 to 6 shown, it shows a ring cooler flue gas circulation treatment device in an embodiment of the present disclosure. Iron ore is one of the main raw materials for sintering. Some iron ores contain sulfides such as pyrite FeS 2 , pyrrhotite Fe 1 -xS, etc. In addition, some sulfur-containing non-ferrous metal ores, such as sphalerite ZnS, galena PbS, etc., will also introduce sulfur elements when mixed with iron ore for sintering. In the high-temperature environment of sintering, when the temperature reaches about 300 °C, the sulfides in the raw materials begin to oxidize with the oxygen in the air. Taking pyrite as an example, the following reaction will occur: 4FeS 2 +11O 2 =2Fe 2 O 3 +8SO 2 . The generated sulfur dioxide SO 2 is one of the main components of sulfur-containing flue gas. As the temperature further rises, other sulfides will also successively undergo oxidation reactions, releasing more SO 2 . During the sintering process, the sulfur-containing gases generated by these reactions are mixed with other combustion products, waste gases, etc. to form sulfur-containing flue gas. As the sintering process progresses, these sulfur-containing flue gases will pass through the suction system of the sintering machine, pass through equipment such as flues and dust collectors, and finally be discharged into the atmosphere.

[0026] The sintering cavity 101 inside the sintering chamber 1 provides space for the sintering reaction. A high-sulfur flue gas outlet 102 is provided at the top of the sintering cavity 101 to discharge the high-sulfur flue gas generated during the sintering process. The cooling cavity 201 of the ring cooler 2 is annular and can withstand the thermal shock of high-temperature sintered ore. The cooling cavity 201 has good heat preservation performance to reduce heat loss. The air box 3 is welded and fixed on the ring cooler 2, and the inside of its gas mixing cavity 301 is smooth to reduce the gas flow resistance. The air inlet 302 is equipped with a flow regulating valve to accurately control the inflow of outside air. The high-sulfur flue gas outlet 102 is connected to the gas mixing cavity 301 through a special pipeline to ensure smooth flue gas transportation. Inside the sintering chamber 1, the sintering raw materials are sintered at a high temperature of about 1350 °C, generating a large amount of SO 2High-temperature flue gas containing pollutants such as NOx and CO. These flue gases first pass through a waste heat treatment device. After recovering part of the sensible heat, the temperature drops to about 350°C and is discharged from the high-sulfur flue gas outlet 102 at the top of the sintering chamber 101. The discharged flue gas enters the gas mixing chamber 301 of the air box 3. At the same time, outside air flows into the gas mixing chamber 301 from the air inlet 302 under the control of a flow regulating valve. In the gas mixing chamber 301, the flue gas and air are fully mixed and then enter the cooling chamber 201 of the annular cooler 2. The temperature of the sintered ore just entering the cooling chamber 201 is about 1050°C. The high-temperature sintered ore exchanges heat with the relatively low-temperature flue gas at about 350°C. The flue gas absorbs heat and the temperature is raised to about 550°C again, achieving effective preheating. At the same time, the sintered ore is cooled and the temperature drops to about 180°C when the sintered ore leaves the cooling chamber 201, meeting the requirements of subsequent processes. During the preheating process, CO in the flue gas undergoes a catalytic reaction with calcium ferrite in the sintered ore, and at the same time, NOx and CO also react, enabling the synergistic reduction of NOx and CO.

[0027] Based on the embodiments in the present application, on the one hand, by introducing the flue gas with most of the heat loss after waste heat recovery into the cooling chamber 201 to exchange heat with the high-temperature sintered ore, the secondary utilization of waste heat is realized and the energy utilization rate is improved. Compared with the traditional process, the system thermal efficiency can be increased by 15% - 20%, reducing the energy consumption in the production process. On the other hand, using the high temperature of the sintered ore to promote the catalytic reaction of CO in the flue gas with calcium ferrite, and at the same time achieving the synergistic reduction of NOx and CO, improving the pollutant removal efficiency. Before entering the subsequent SCR denitration process, the NOx content is reduced in advance, reducing the burden on SCR denitration, increasing the overall denitration efficiency by 10% - 15%, and effectively reducing pollutant emissions. At the same time, by controlling the temperature and flow rate of the flue gas entering the cooling chamber 201, the sintered ore can be preliminarily cooled, reducing the amount of additional air introduced, and thus reducing the generation of waste gas containing air pollutants, reducing the pressure on subsequent denitration and dust removal equipment, reducing energy consumption and subsequent pollution treatment costs. It is expected that the treatment cost per ton of ore can be reduced by 10 - 15 yuan, improving the economic benefits of the enterprise.

[0028] In some examples, multiple bellows 3 are evenly arranged in a circumferential direction around the circular cooler 2, and adjacent bellows 3 are connected by a sealing connector to ensure that gas does not leak. The structure of the gas mixing chamber 301 of each bellows 3 is the same as that of a single bellows, and the size is optimized according to the size of different positions of the circular cooler 2. One end of the first air duct 4 is connected to the high-sulfur flue gas outlet 102 of the sintering chamber 1, and the other end is respectively connected to the gas mixing chambers 301 of each bellows 3 through a branch pipe. The main body of the desulfurization device 5 is a large reaction tower, which is internally provided with multiple spray layers, and each spray layer is equipped with multiple atomizing nozzles, which can evenly spray the limestone slurry into the rising flue gas. A slurry pool is provided at the bottom of the reaction tower, and the limestone slurry in the slurry pool is transported to the spray layer through a circulation pump. In the reaction tower, the flue gas is in full contact with the limestone slurry, and a chemical reaction occurs to remove sulfur oxides.

[0029] In this solution, a desulfurization device 5 is provided, and the sintering chamber 101, the desulfurization device 5 and the gas mixing chamber 301 are sequentially connected through the first air duct 4. Before utilizing the waste heat of the sintered ore, sulfur oxides in the flue gas are effectively removed, avoiding the influence of sulfur elements on the quality of the sintered ore and ensuring the stable operation of the blast furnace. The desulfurization efficiency can reach more than 92%, significantly reducing sulfur oxide emissions. The arrangement of multiple bellows 3 around and the setting of the first air duct 4 enable the desulfurized flue gas to enter the cooling chamber 201 of the circular cooler 2 more evenly, strengthening the heat exchange process with the high-temperature sintered ore.

[0030] In some examples, the dust removal device 6 is selected as a pulse bag filter, and the denitration device 7 adopts the SCR denitration process, which is internally provided with multiple catalyst modules. The catalyst module is composed of a ceramic carrier and a vanadium-titanium-based active component. The carrier is resistant to high temperature and wear, and the active component can efficiently catalyze the reaction of ammonia and NOx at an appropriate temperature. The flue gas discharged from the cooling chamber 201 enters the dust removal device 6. In the pulse bag filter, when the flue gas passes through the filter bag, the dust particles are intercepted on the surface of the filter bag, and the dust content of the purified flue gas is greatly reduced, meeting the inlet requirements of the subsequent denitration device 7.

[0031] The flue gas after dust removal enters the denitration device 7. In the SCR denitration device, ammonia is evenly sprayed into the flue gas through an injection system, and reacts with NOx in the flue gas under the action of the catalyst to generate nitrogen and water, realizing denitration. The denitrated qualified flue gas is discharged into the external environment. With a reasonable device layout and connection sequence, each treatment link closely cooperates. Desulfurization first avoids the influence of sulfur elements on the quality of the sintered ore. The reaction during the cooling process reduces the NOx content, reducing the denitration burden. Dust removal provides clean flue gas for denitration, improving the denitration efficiency and the service life of the catalyst. Under the overall synergistic effect, the comprehensive pollutant removal effect is improved, and the operation load and cost of each device are reduced.

[0032] In some examples, the cooling chamber 201 naturally forms a high-temperature zone 202, a medium-temperature zone 203, and a low-temperature zone 204 according to the temperature change of the sinter during the cooling process. Near the inlet end of the sinter, the temperature of the sinter is relatively high, which is defined as the high-temperature zone 202, with an initial temperature of about 1000 - 1100 °C; as the sinter moves in the cooling chamber, the temperature gradually decreases, and the area with the intermediate temperature range is the medium-temperature zone 203; near the outlet end of the sinter, the temperature further decreases, and this area is the low-temperature zone 204. When the sinter leaves the cooling chamber 201, its temperature drops to 150 - 200 °C. The cooling chamber 201 is provided with a plurality of cooling gas inlets 205 and cooling gas outlets 206, and a plurality of gas mixing chambers 301 are communicated with the cooling chamber 201 through the cooling gas inlets 205. The heat exchanger 9 selects an efficient shell-and-tube structure, and both its tube material and shell material have excellent heat conduction performance. The high-temperature cooling gas flows in the tube side, while the medium for providing heat for the denitration device 7 flows in the shell side, and efficient heat exchange is achieved through the tube wall. On the second air duct 8, the heat exchanger 9 collects the heat of the high-temperature cooling gas from the high-temperature zone 202. After the cooling gas releases heat in the heat exchanger 9 and its temperature decreases, it then enters the dust removal device 6 to remove the dust carried therein. The heat collected by the heat exchanger 9 is then transported to the denitration device 7 to provide the thermal energy required for the denitration reaction, so that the flue gas reaches a temperature condition more suitable for the denitration reaction. By deeply utilizing the waste heat of the cooling chamber 201, the heat of the cooling gas in the high-temperature zone 202 is recovered for the denitration device 7, reducing the consumption of additional energy during the cooling process, reducing the operating load of related equipment, extending the service life of the equipment, and thus reducing the overall operating cost. It is expected that the energy consumption of the cooling system can be reduced by 10% - 15%. The treated flue gas enters the high-temperature zone 202 to participate in the cooling, making the temperature field distribution in the cooling chamber 201 more reasonable, which helps to improve the uniformity of sinter cooling. Due to more uniform cooling, the quality stability of the sinter is improved, reducing product quality problems caused by uneven cooling, and the defective product rate can be reduced by 5% - 8%. The entire treatment process effectively reduces the pollutant emissions in the flue gas through links such as desulfurization, dust removal, and denitration. At the same time, the efficient utilization of waste heat reduces energy consumption and indirectly reduces the pollutant emissions caused by energy production, with significant environmental benefits.

[0033] In some examples, the diameter of the third air duct 10 is designed according to the total flow rate of the cooling gas discharged from the medium-temperature zone 203 and the low-temperature zone 204, ensuring that it can accommodate and smoothly transport the cooling gas from these two zones. The cooling gas after heat exchange in the medium-temperature zone 203 and the low-temperature zone 204 respectively converges into the third air duct 10 through their respective corresponding cooling gas outlets 206. The cooling gas in the medium-temperature zone 203 and the low-temperature zone 204 directly enters the dust removal device 6 through the third air duct 10 without waste heat recovery, simplifying the device structure and reducing the investment and maintenance costs of the heat exchange equipment. Compared with the complex structure for recovering waste heat from the cooling gas in the medium and low temperature zones, the equipment investment cost can be reduced by 15% - 20%, and the maintenance workload is reduced by about 20% - 30%. This design reduces the complexity of the system, reduces the failure risk caused by excessive heat exchange equipment, and improves the operating stability of the device.

[0034] In some examples, the partition 11 is arranged in the air box 3 and is made of an alloy material with high temperature resistance, corrosion resistance and certain strength. Its shape is an annular plate-like structure adapted to the inner contour of the air box 3, which divides the gas mixing chamber 301 into an inner air chamber 303 and an outer flue gas chamber 304. The outer flue gas chamber 304 surrounds the inner air chamber 303. The air inlet 302 leads to the inner air chamber 303. The outer flue gas chamber 304 is provided with a flue gas inlet 305. The high-sulfur flue gas outlet 102 is communicated with the outer flue gas chamber 304 through the flue gas inlet 305. The inner air chamber 303 is communicated with the cooling gas inlet 205. A virtual passage is provided between the outer flue gas chamber 304 and the inner air chamber 303 to realize the mixing of flue gas and air. When the flue gas in the outer flue gas chamber 304 flows into the inner air chamber 303 through the communication structure, a stratification phenomenon occurs, and the medium-temperature flue gas is concentrated on both sides of the cold air, forming a special gas distribution pattern. The gas after such stratified mixing enters the cooling chamber 201 from the inner air chamber 303 through the cooling gas inlet 205.

[0035] After entering the cooling chamber 201, the flue gas on both sides "forces" the cold air in the middle to pass through the screen plate at the bottom of the sintering pallet towards the position closer to the center, so as to centrally cool the sinter. Even if a small amount of gas escapes on both sides, due to the reduced temperature difference between the flue gas and the surrounding environment, it will not have a serious impact on the waste heat recovery efficiency like the short-circuit of cold air. Through the stratified flow in the gas mixing chamber 301, more concentrated cooling of the sinter can be achieved, effectively avoiding the problem of uneven local cooling of the sinter. Compared with the situation of cold air short-circuit, since the temperature of the flue gas is closer to the temperature of the sinter in the medium-temperature zone 203, even if a small amount of gas escapes, the impact on the waste heat recovery efficiency is greatly reduced. This design effectively reduces the heat loss caused by excessive temperature difference, significantly improving the waste heat recovery efficiency. In the extreme situation where there are problems with the sealing performance, it is expected that the waste heat recovery efficiency can be increased by 30% - 40% compared with the cold air short-circuit situation, further improving the energy utilization efficiency and reducing the production cost. The inner and outer sandwich structure of the gas mixing chamber 301 and the resulting gas stratified flow optimize the air flow distribution in the cooling chamber 201. This enables the cooling gas to contact the sinter more reasonably, not only improving the cooling effect, but also reducing the equipment loss that may be caused by air flow disorder, extending the service life of the equipment, and reducing the equipment maintenance cost. The equipment maintenance cycle can be extended by 15% - 20%, reducing the maintenance cost.

[0036] In some examples, the sliding block 12 is a plate-like structure, and the sliding rails provided on both sides of the sliding block 12 cooperate with the sliding grooves on the inner wall of the gas mixing chamber 301 to ensure a smooth sliding process. The pushed portion 1201 is a protruding structure on the sliding block 12, and its shape can more effectively receive the thrust generated by the pressure change in the external smoke chamber 304, and the position is reasonably set to ensure that the sliding block 12 can slide stably when subjected to force. In different working stages of the ring cooler 2, the operator can determine the position of the sliding block 12 according to actual working conditions, such as the output and temperature of the sintered ore, and the flow rate, temperature and other parameters of the flue gas and air. For example, when the output of the sintered ore increases and more cooling air is needed, the sliding block 12 is slid to increase the opening of the connecting port 306 or even completely cancel the shielding of the connecting port 306, so that the flue gas in the external smoke chamber 304 can flow more smoothly into the inner air chamber 303 to mix with the air, so as to increase the amount of mixed gas entering the cooling chamber 201. When the sliding stopper 12 is adjusted to the right position, the outside air enters the inner air cavity 303 through the air inlet 302, and the flue gas enters the outer flue gas cavity 304 through the flue gas inlet 305 from the high-sulfur flue gas outlet 102 of the sintering cavity 101. The flue gas flows into the inner air cavity 303 through the connecting port 306 and mixes with the air. The mixed gas enters the cooling cavity 201 through the cooling gas inlet 205 to cool the sintered ore. Under normal working conditions, the sliding stopper 12 partially blocks the connecting port 306 to control the speed and amount of flue gas entering the inner air cavity 303, so that the flue gas and air reach a suitable mixing ratio, and stable cooling of the sintered ore is achieved. At the same time, the sliding stopper 12 and the connecting port 306 are both connected by a smooth arc surface, and the airflow will flow through the arc surface. Although the flow rate will be somewhat reduced relative to the air in the center position, this design allows the gas to enter the cooling cavity 201 stably by reducing the generation of gas turbulence.

[0037] In some examples, during the operation of the annular cooler 2, the operator will, according to the temperature and composition requirements of the cooling gas in different temperature zones of the cooling chamber 201, operate the flow control valves on the flue gas inlet 305 pipeline and the air inlet 302 pipeline. For example, in the high-temperature zone 202, in order to make full use of the waste heat of the flue gas and ensure the cooling effect on the sintered ore, the opening of the flue gas flow control valve will be appropriately increased, and at the same time, the air flow control valve will be adjusted accordingly, so that more high-temperature flue gas and an appropriate amount of air are mixed and then enter the cooling chamber 201. In the medium and low-temperature zone 204, according to the actual cooling situation, the opening of the flue gas flow control valve will be reduced and the air flow will be increased to achieve targeted cooling. When the air pressure in the outer flue gas chamber 304 increases due to the change in the flue gas volume, the air pressure will act on the pushed part 1201 of the sliding stopper 12. Due to the special shape and position design of the pushed part 1201, it can efficiently convert the air pressure into the power to make the sliding stopper 12 slide, drive the sliding stopper 12 to slide, and the communication port 306 is gradually opened to assist in adjusting the amount of flue gas entering the inner air chamber 303. These two adjustment methods cooperate with each other. For example, when the flue gas volume suddenly increases significantly during the sintering process, on the one hand, the flow control valve will automatically reduce the opening when it senses it to control the amount of flue gas entering; on the other hand, the increased air pressure in the outer flue gas chamber 304 pushes the sliding stopper 12 to open the communication port 306, allowing some excess flue gas to enter the inner air chamber 303, ensuring that the mixing ratio of flue gas and air is within an appropriate range and avoiding affecting the quality of the sintered ore due to excessive flue gas. By setting flow control valves on the flue gas and air inlet pipelines and combining the response of the pushed part 1201 of the sliding stopper 12 to the air pressure, the input ratio of the two can be directly and quickly adjusted to make an immediate response to the requirements of different temperature zones. Compared with the traditional adjustment method, accurate adjustment can be achieved without complex operations, greatly improving the adjustment efficiency. Ensure that the best cooling effect can be achieved in each temperature zone, avoid affecting the quality of the sintered ore due to uneven cooling or improper mixing ratio of flue gas and air, improve the stability of the quality of the sintered ore, reduce the defective rate, and it is expected that the defective rate can be reduced by 5% - 10%.

[0038] In some examples, the first elastic member 13 is selected as a high-strength spring. When the air pressure in the outer flue gas chamber 304 increases, the air pressure acts on the pushed part 1201 of the sliding stopper 12, generating a thrust sufficient to overcome the elastic force of the first elastic member 13, causing the sliding stopper 12 to slide in the direction of canceling the blockage of the communication port 306. At this time, the communication area between the outer flue gas chamber 304 and the inner air chamber 303 increases, and more flue gas can flow into the inner air chamber 303 to be mixed with air, and the mixed gas then enters the cooling chamber 201 to cool the sintered ore.

[0039] When the air pressure in the external flue gas chamber 304 decreases and the thrust acting on the pushed part 1201 is less than the elastic force of the first elastic member 13, the first elastic member 13 comes into play and pulls the sliding stop member 12 to slide back in the direction of blocking the communication port 306. This reduces the amount of flue gas flowing into the internal air chamber 303, thereby adjusting the mixing ratio of flue gas and air to meet the requirements of different working conditions, ensuring that suitable cooling gas can be provided for the sintered ore under different circumstances, and avoiding affecting the quality of the sintered ore due to inappropriate flue gas volume. The setting of the first elastic member 13 enables the sliding stop member 12 to automatically adjust the opening degree of the communication port 306 according to the air pressure change in the external flue gas chamber 304, and further adjust the mixing ratio of flue gas and air. This automatic adjustment mechanism can better adapt to different working states of the annular cooler 2 and the requirements of the sintering process, without frequent manual intervention, reducing labor costs and the impact on the quality of the sintered ore caused by improper manual operation. It further ensures the cooling effect and quality stability of the sintered ore, and improves the automation degree and reliability of the production process.

[0040] In some examples, the regulating valve 14 is a flow regulating valve installed in the first air duct 4. The regulating valve 14 has two channel branches. One side of the first air duct 4 leads to the high-temperature zone 202, and the other side of the first air duct 4 leads to the medium-temperature zone 203 and the low-temperature zone 204. It realizes the precise regulation of the flue gas volume leading to different temperature zones. According to the data fed back by the temperature sensors, component sensors, etc. installed in each temperature zone of the cooling chamber 201, after the control system makes a judgment, the regulating valve 14 starts to work. For example, when the temperature of the sintered ore in the high-temperature zone 202 is too high and more high-temperature flue gas is needed to assist in cooling to utilize its waste heat, the control system issues an instruction, and the regulating valve 14 increases the opening degree of the air duct leading to the high-temperature zone 202, and at the same time correspondingly reduces the opening degree of the air ducts leading to the medium-temperature zone 203 and the low-temperature zone 204, so that more desulfurized flue gas (which can no longer be called high-sulfur flue gas at this time) flows to the high-temperature zone 202. On the contrary, if the cooling demand in the medium-temperature zone 203 or the low-temperature zone 204 changes, such as the temperature is too low and the flue gas volume needs to be reduced, or the mixing ratio of flue gas and air needs to be adjusted according to the component detection, etc., the regulating valve 14 makes the opposite adjustment to ensure that each temperature zone can obtain an appropriate amount of flue gas for cooling and reaction, and avoid affecting the quality of the sintered ore due to inappropriate flue gas volume.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not restrictive. Although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and they should all be covered by the scope of the claims of the present disclosure.

Claims

1. A flue gas circulation treatment device for an annular cooler, characterized in that: include: A sintering chamber (1), the sintering chamber (1) having a sintering cavity (101), the sintering cavity (101) having a high-sulfur fume outlet (102); A ring cooler (2), wherein the ring cooler (2) comprises a cooling chamber (201), A wind box (3), the wind box (3) being arranged on the ring cooler (2), the wind box (3) having an air mixing chamber (301), the high-sulfur flue gas outlet (102) leading to the air mixing chamber (301), the air mixing chamber (301) being in communication with the cooling chamber (201), the air mixing chamber (301) having an air inlet (302), the air mixing chamber (301) being used to communicate with the outside through the air inlet (302).

2. The flue gas circulation treatment device of an annular cooler according to claim 1, characterized in that: There are a plurality of wind boxes (3), and the plurality of wind boxes (3) are arranged around the ring cooler (2). The ring cooler flue gas circulation treatment device further comprises: A first air duct (4), the first air duct (4) being used to connect the annular cooler (2) and the wind box (3), and being used to connect the high-sulfur flue gas outlet (102) and the plurality of gas mixing chambers (301); The desulfurization device (5), the sintering chamber (101), the desulfurization device (5) and the gas mixing chamber (301) are connected in sequence through the first air duct (4).

3. The flue gas circulation treatment device of an annular cooler according to claim 2 is characterized in that: The annular cooler flue gas circulation treatment device further comprises: Dust removal device (6); A denitration device (7), wherein the cooling chamber (201), the dust removal device (6) and the denitration device (7) are connected in sequence, and the denitration device (7) is used to be connected to the outside.

4. The flue gas circulation treatment device for an annular cooler according to claim 3, characterized in that: The cooling chamber (201) is divided into a high temperature zone (202), a medium temperature zone (203) and a low temperature zone (204); the cooling chamber (201) has a plurality of cooling gas inlets (205) and a plurality of cooling gas outlets (206); a plurality of the gas mixing chambers (301) are connected to the cooling chamber (201) via the plurality of the cooling gas inlets (205) in a one-to-one correspondence; the annular cooler flue gas circulation treatment device further comprises: a second air duct (8), the second air duct (8) connecting a plurality of cooling air outlets (206) corresponding to the high temperature zone (202) with the dust removal device (6); A heat exchanger (9), wherein the heat exchanger (9) is arranged on the second air duct (8), the plurality of cooling air outlets (206) corresponding to the high temperature zone (202), the heat exchanger (9) and the dust removal device (6) are connected in sequence through the second air duct (8), and the heat collected by the heat exchanger (9) is passed to the denitration device (7).

5. The flue gas circulation treatment device of an annular cooler according to claim 4, characterized in that: The annular cooler flue gas circulation treatment device further comprises: A third air duct (10), wherein the third air duct (10) connects a plurality of cooling air outlets (206) corresponding to the medium temperature zone (203), a cooling air outlet (206) corresponding to the low temperature zone (204), and the dust removal device (6).

6. The flue gas circulation treatment device of an annular cooler according to claim 4, characterized in that: The annular cooler flue gas circulation treatment device further comprises: A partition (11), wherein the partition (11) is arranged in the wind box (3) to divide the air mixing chamber (301) into an inner air chamber (303) and an outer smoke chamber (304); the outer smoke chamber (304) is located around the inner air chamber (303); the air inlet (302) leads to the inner air chamber (303); the outer smoke chamber (304) has a smoke inlet (305); the high-sulfur smoke outlet (102) is connected to the outer smoke chamber (304) through the smoke inlet (305); the outer smoke chamber (304) is used to lead to the inner air chamber (303); the inner air chamber (303) is connected to the cooling air inlet (205).

7. The flue gas circulation treatment device of an annular cooler according to claim 6, characterized in that: A communication port (306) is provided between the inner air cavity (303) and the outer smoke cavity (304). The ring cooler smoke circulation treatment device further comprises: A sliding stopper (12), the sliding stopper (12) being slidably disposed in the gas mixing chamber (301), the sliding stopper (12) being used to block or unblock the communication port (306) after sliding.

8. The flue gas circulation treatment device for an annular cooler according to claim 7, characterized in that: The sliding stopper (12) has a pushed portion (1201), and the pushed portion (1201) is configured such that when the air pressure in the external smoke cavity (304) increases, the pushed portion (1201) is pushed, thereby driving the sliding stopper (12) to slide and gradually stop blocking the communication port (306).

9. The flue gas circulation treatment device of an annular cooler according to claim 7, characterized in that: The annular cooler flue gas circulation treatment device further comprises: A first elastic member (13), wherein one end of the first elastic member (13) acts on the bellows (3) and the other end acts on the sliding stopper (12), providing a force for the sliding stopper (12) to slide and return to a position in a direction that blocks the connecting port (306).

10. The flue gas circulation treatment device of an annular cooler according to claim 4, characterized in that: The annular cooler flue gas circulation treatment device further comprises: A regulating valve (14), wherein the regulating valve (14) is arranged in the first air duct (4), and the first air duct (4) on one side of the regulating valve (14) leads to the high temperature zone (202), and the first air duct (4) on the other side of the regulating valve (14) leads to the medium temperature zone (203) and the low temperature zone (204), and the regulating valve (14) is used to adjust the amount of high-sulfur flue gas leading to the high temperature zone (202) and the amount of high-sulfur flue gas leading to the medium temperature zone (203) and the low temperature zone (204).

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