Ventilation resistance adjusting method and system for waste heat utilization of circular cooler

Abstract

In order to solve the problem that an existing fixedly-arranged blind plate type partition cannot be adaptively adjusted according to actual working condition changes, the invention discloses a ventilation resistance adjusting method and system for waste heat utilization of a circular cooler. A series air port adjusting mechanism is creatively arranged at a series air port between a high-temperature section medium-temperature waste gas circulating air bellow and a waste heat waste gas circulating air bellow, and the opening degree of the series air port can be adjusted in real time according to changes of current actual circulating working conditions of medium-temperature waste gas and waste heat waste gas. And therefore, the air volume distribution in the air duct and the fan operation effect are ensured to be in the optimal operation condition, and the cooling and waste heat utilization efficiency of the circular cooler is remarkably improved. The method and the system have the advantages of being simple in overall structure, convenient in process control, low in investment cost, easy to operate, high in control precision, good in flexibility and the like, and further have excellent prospects of large-scale popularization and application.

Description

Technical Field

[0001] The present invention relates to a steel smelting cooling process and equipment, and in particular to a method and system for adjusting the series air resistance for utilizing waste heat from a ring cooler, belonging to the technical field of steel smelting cooling. Background Art

[0002] With the introduction of policies such as extreme energy efficiency and ultra-low emissions in the steel industry, the sinter cooling system with the ring cooler as the core is developing towards lower energy consumption, higher waste heat utilization efficiency, and less exhaust gas emissions. A series of new technologies including cascade utilization and cascade air supply have been introduced one after another. The parallel fans in the ring cooler's air blowing system show inconsistent parameters such as air volume, air temperature, and air pressure. The mutual interference between the fans is significantly enhanced, which will have a great impact on the actual air blowing effect of the fans and the energy consumption of the system. At present, in order to reduce the interference between two adjacent parallel fans, especially to reduce the mutual interference between the wind boxes in the medium-temperature cascade fan action area of ​​the high-temperature section of the ring cooler and the wind boxes in the waste heat circulation fan action area after the waste heat of the hot exhaust gas in the high-temperature section, a blind plate partition is often set inside the cascade air duct of the ring cooler. However, in actual operation, although this method can effectively prevent the mutual influence between fans, it is affected by the large fluctuations in the operating conditions of the ring cooler, especially for parallel fans with large differences in operating parameters (especially between medium-temperature cascade fans and waste heat circulation fans). The location of the bellows partition is not easy to control, and once the existing blind plate partition is set, it is difficult to adjust according to actual conditions during operation, which will greatly affect the operating effect of the fan, the air volume and pressure distribution of the ring cooler, thereby affecting the fan energy consumption and the cooling effect of the ring cooler. Summary of the Invention

[0003] In view of the problem in the prior art that a fixed blind plate partition is set between the high-temperature section wind boxes of the medium-temperature cascade fan and the waste heat circulation fan, which cannot be adaptively adjusted, the present invention provides a cascade resistance adjustment method and system for waste heat utilization of a ring cooler. By designing a cascade air port adjustment mechanism with adjustable opening, the existing blind plate structure is replaced, and the opening of the cascade air port can be precisely adjusted according to the changes in the real-time operating status parameters of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan in actual working conditions, thereby ensuring the respective operating effects of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, reducing the energy consumption of the fan while ensuring the stability of the material cooling effect, and further ensuring and improving the waste heat utilization efficiency of the ring cooling and hot exhaust gas.

[0004] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0005] According to a first embodiment of the present invention, a method for adjusting the series air resistance for waste heat utilization of an annular cooler is provided:

[0006] A method for adjusting the string air resistance for utilizing waste heat from a ring cooler, the method comprising the following steps:

[0007] S1: Based on the flow of the material, the ring cooler is divided into a high-temperature section, a medium-temperature section, and a low-temperature section. The hot material passes through the high-temperature section, the medium-temperature section, and the low-temperature section in sequence for heat exchange and cooling to obtain a cold material. During the heat exchange and cooling process: the medium-temperature hot exhaust gas discharged from the medium-temperature section is recycled as cooling air for the high-temperature section, and the high-temperature hot exhaust gas discharged from the high-temperature section, after waste heat is utilized, is recycled as cooling air for the high-temperature and medium-temperature sections. Preferably, ambient temperature gas is used as cooling air for the low-temperature section, and the low-temperature hot exhaust gas discharged from the low-temperature section is recycled as cooling air for the medium-temperature section.

[0008] S2: Based on the real-time operating status parameters of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, an equation is established to calculate the actual total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan. The actual total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is calculated based on the equation. If the difference between the actual total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan and the rated total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is not greater than the allowable difference for the operating conditions, the current operating conditions are maintained unchanged. If the difference between the actual total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan and the rated total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is greater than the allowable difference for the operating conditions (the allowable difference generally does not exceed 10% of the total volume of the rated total air volume), the next step is performed (i.e., step S3).

[0009] S3: A cross-flow air inlet adjustment mechanism is installed at the cross-flow air inlet of the wind box adjacent to the medium-temperature hot exhaust gas action area and the waste heat exhaust gas action area in the high-temperature section. The cross-flow air inlet adjustment mechanism adjusts the opening of the cross-flow air inlet so that the difference between the actual air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan and their rated air volume approaches zero (ideally, zero).

[0010] Preferably, the calculation equation is specifically:

[0011] Q 总实 =K 中 ×A 中 ×V 中 ×n 中 / (P 中出 -P 中入 )+K 循 ×A 循 ×V 循 ×n 循 / (P 循出 -P 循入 ) (1).

[0012] In formula (1), Q 总实 is the actual total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, m 3 / h. K 中 is the operating constant of the medium temperature hot exhaust gas circulation fan, which is 4.4×10 6 ~6.5×10 6 . A 串 is the output current of the medium temperature hot exhaust gas circulation fan, A. V 中 is the output voltage of the medium temperature hot exhaust gas circulation fan, V. 中 P is the fan efficiency of the medium temperature hot exhaust gas circulation fan, which is 0.7~0.9. 中出 is the outlet pressure of the medium temperature hot exhaust gas circulation fan, Pa. P 中入 is the inlet pressure of the medium temperature hot exhaust gas circulation fan, Pa. K 循 is the operating constant of the waste heat exhaust gas circulation fan, which is 4.4×10 6 ~6.5×10 6 . A 循 is the output current of the waste heat exhaust gas circulation fan, A. V 循 is the output voltage of the waste heat exhaust gas circulation fan, V. 循 P is the fan efficiency of the waste heat exhaust gas circulation fan, which is 0.7~0.9. 循出 P is the outlet pressure of the waste heat exhaust gas circulation fan, Pa. 循入 is the inlet pressure of the waste heat exhaust gas circulation fan, Pa.

[0013] Preferably, in step S3, the opening of the cross-flow vent is adjusted by the cross-flow vent adjustment mechanism as follows: first, the material layer resistance in each action area is calculated based on the material surface wind speed in each action area of ​​the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, and the material layer resistance difference △P (Pa) is obtained. Then, the adjustment amount △A (m) of the cross-flow vent opening is calculated based on the obtained material layer resistance difference △P. 2 ). Among them: the material layer resistance difference △P and the adjustment amount of the string air port opening △A are calculated by the following formula (2) and formula (3) respectively:

[0014] △P=kh(v2 1.67 -v1 1.67 )+C (2).

[0015] △A=A-[sqrt(ρv3 2 / △P)] / (2C d 2 ) (3).

[0016] In formulas (2)-(3), k is the working drag coefficient, which ranges from 1000 to 1500. C is the working drag constant, which ranges from 800 to 1200. h is the material layer thickness, m. v1 is the material surface wind speed in the medium-temperature hot exhaust gas circulation fan area, m / s. v2 is the material surface wind speed in the waste heat exhaust gas circulation fan area, m / s. A is the flow cross-sectional area when the series air port is opened to the maximum, m 2 ρ is the fluid density, kg / m 3 . C d is the flow coefficient, ranging from 0.6 to 0.9. v3 is the velocity of the fluid passing through the string air outlet, m / s.

[0017] When the difference between the material layer resistance in the respective action areas of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is △P, the amount of reduction in the opening of the string air port is the calculated value △A of the above formula (3) through the string air port adjustment mechanism.

[0018] Preferably, the air outlet of the air outlet adjustment mechanism is a rectangular air outlet. The opening size of the air outlet is adjusted by adjusting the width and / or height of the rectangular air outlet, wherein:

[0019] △A=L×H-(L-△L)×(H-△H) (4).

[0020] In formula (4), L is the width of the rectangular string air outlet before adjustment, m. ΔL is the adjustment amount of the rectangular string air outlet width, m. H is the height of the rectangular string air outlet before adjustment, m. ΔH is the adjustment amount of the rectangular string air outlet height, m.

[0021] According to a second embodiment of the present invention, a series air resistance adjustment system for utilizing waste heat from an annular cooler is provided:

[0022] A system for regulating cross-flow resistance for waste heat utilization in a ring cooler, or a system for use in the cross-flow resistance regulation method described in the first embodiment, comprises a ring cooler and a waste heat utilization mechanism. The ring cooler comprises a high-temperature section, a medium-temperature section, and a low-temperature section, depending on the flow of material. The bottom bellows of the high-temperature section are divided into a front bellows and a rear bellows, and cross-flow adjustment mechanisms are provided at the cross-flow ports of the front and rear bellows.

[0023] Based on the airflow pattern, the hot exhaust gas outlet at the top of the medium-temperature section is connected to the front wind box of the high-temperature section via a first duct. The hot exhaust gas outlet at the top of the high-temperature section is connected to the air inlet of the waste heat recovery mechanism. The air outlet of the waste heat recovery mechanism is connected to the rear wind box of the high-temperature section via a second duct. A first circulation fan (i.e., the medium-temperature hot exhaust gas circulation fan) is installed in the first duct, and a second circulation fan (i.e., the waste heat exhaust gas circulation fan) is installed in the second duct.

[0024] Preferably, the bottom wind box of the low-temperature section is connected to a normal-temperature blower. The hot exhaust gas outlet at the top of the low-temperature section is connected to the bottom wind box of the medium-temperature section via a third pipe. A third circulation blower (i.e., a low-temperature hot exhaust gas circulation blower) is provided on the third pipe. Preferably, the hot exhaust gas outlet at the top of the medium-temperature section is also connected to an exhaust pipe.

[0025] Preferably, the cross-flow vent adjustment mechanism comprises a rectangular housing, a telescopic drive device (preferably a combination of a hydraulic cylinder and a telescopic push rod), a partition, and a foldable flexible partition (similar to a folding screen or folding paper fan). The partition is horizontally positioned above the interior of the rectangular housing, dividing the interior of the rectangular housing into an upper chamber and a lower chamber. The front and rear sidewalls of the lower chamber ("front" refers to the upstream side of the material flow on the annular cooler, and "rear" refers to the downstream side of the material flow on the annular cooler) are open, thereby forming the cross-flow vent. The telescopic drive device is positioned within the upper chamber. The foldable flexible partition is positioned within the lower chamber, parallel to the front and rear sidewalls. In the width direction (the horizontal direction perpendicular to the material flow direction on the annular cooler, i.e., the width of the annular cooler), one end of the foldable flexible partition is fixedly connected to the sidewall of the lower chamber, and the other end is provided with a vertical support rod. A strip-shaped through-hole extending along the width of the partition is defined in the middle portion. The top of the vertical support link passes through the strip-shaped through-hole and is connected to the push rod of the telescopic drive device. The telescopic drive device controls the movement distance of the vertical support link in the strip-shaped through-hole to adjust the width expansion of the foldable flexible partition, thereby adjusting the opening of the series air vent.

[0026] Preferably, a telescopic drive device is provided on each side of the width of the upper chamber, and a pair of foldable flexible partitions are symmetrically provided on each side of the width of the lower chamber. The two telescopic drive devices are used to control the two foldable flexible partitions to move closer or further away from each other, thereby adjusting the opening of the cross-flow air outlet.

[0027] Preferably, a lower guide groove extending in the width direction is provided at the bottom of the lower chamber, and an upper guide groove extending in the width direction is provided on the bottom side of the partition. The lower end of the foldable flexible partition is movably mounted in the lower guide groove, and the upper end thereof is movably mounted in the upper guide groove.

[0028] Preferably, telescopic horizontal supports are provided at the upper and lower ends of the foldable flexible partition. Preferably, the telescopic horizontal supports are sleeve-type telescopic rods.

[0029] Preferably, a material blocking screen is provided at the air outlet on the front side wall of the lower chamber and at the air outlet on the rear side wall of the lower chamber.

[0030] Preferably, the air outlet adjustment mechanism includes a rectangular shell, a telescopic drive device, a platform, an oblique support, a central axis, a foldable air outlet duct and a telescopic elastic baffle. The rectangular shell has an inner cavity that passes through from front to back. The central axis is vertically arranged at the center of the inner cavity of the rectangular shell. Eight oblique supports are respectively arranged at the eight top corners of the inner cavity of the rectangular shell, and the inner ends of the eight oblique supports are extended inward and connected to the middle of the central axis. The foldable air outlet duct is arranged in the inner cavity of the rectangular shell, and the opening edge of one end of the foldable air outlet duct is movably connected to the four oblique supports located on the front side of the rectangular shell, and the opening edge of the other end is movably connected to the four oblique supports located on the back side of the rectangular shell (for example, in a manner similar to the connection between the ring and the slide rod between the curtain and the curtain rod or the connection between the pulley and the slide rail), thereby forming a rectangular air outlet cavity that passes through the front and back sides of the rectangular shell. Four telescopic drive devices are provided at the middle of the four corners of the inner cavity of the rectangular shell through a platform. The push rods of the telescopic drive devices extend toward the center of the inner cavity of the rectangular shell and are connected to the wall of the folding air duct. The telescopic drive device drives the two ends of the folding air duct to slide synchronously on the eight oblique supports through the reciprocating motion of the push rod, thereby controlling the opening of the rectangular air duct cavity of the folding air duct. The telescopic elastic baffle is a U-shaped structure. The outer edge of the telescopic elastic baffle is fixedly connected to the four inner walls of the rectangular shell, and the inner edge of the telescopic elastic baffle is fixedly connected to the four outer walls of the folding air duct. The plate surface of the telescopic elastic baffle is movably connected to the four oblique supports on the front and / or rear side of the rectangular shell (for example, in a manner similar to the connection between the ring and the slide rod between the curtain and the curtain rod, or the connection between the pulley and the slide rail), that is, the telescopic elastic baffle contracts or expands as the folding air duct expands or contracts.

[0031] Preferably, a material blocking screen is provided at both the front opening and the rear opening of the inner cavity penetrating the rectangular shell.

[0032] Preferably, the telescopic elastic baffle is a U-shaped structure formed by splicing two elastic blades folded along the width direction (that is, they can be folded, retracted and unfolded in the width direction, and elastically stretched and retracted in the vertical direction) and two elastic blades folded along the vertical direction (that is, they can be folded, retracted and unfolded in the vertical direction, and elastically stretched and retracted in the width direction) in sequence.

[0033] Preferably, the waste heat utilization mechanism includes an economizer and a waste heat boiler. The economizer is positioned above the high-temperature section and connected to the hot exhaust gas outlet at the top of the high-temperature section. The waste heat boiler is positioned below the ring cooler, with the waste heat boiler's air inlet connected to the economizer's air outlet via a gas pipeline, and the waste heat boiler's air inlet is in communication with a second pipeline.

[0034] Preferably, a first pressure detector is provided on the first pipeline upstream of the first circulation fan, and a second pressure detector is provided on the first pipeline downstream of the first circulation fan.

[0035] Preferably, a third pressure detector is provided on the second pipeline upstream of the second circulation fan, and a fourth pressure detector is provided on the second pipeline downstream of the second circulation fan.

[0036] Preferably, a normal temperature air supply duct is connected to the air inlet of the third circulation fan or to the third duct located upstream of the third circulation fan.

[0037] Preferably, a material surface wind speed detector is independently provided above the material layer in the high temperature section, the medium temperature section and the low temperature section. A fluid wind speed detector is also provided in the air flow regulating mechanism.

[0038] In the existing technology, the sintered ore at the tail of the sintering machine is crushed by a single roller and then arranged on the ring cooler trolley through a feeding chute. The lower part of the trolley is connected to the bellows, the bellows is connected to the fan, and the upper part of the trolley is connected to the ring cooling air hood. In the process of the trolley moving forward, the cooling air blown by the fan passes through the bellows and is directly sent into the material layer from the bottom of the trolley to cool the sintered ore. After cooling, the hot exhaust gas enters the ring cooling air hood from the top of the material layer to recover the waste heat. After cooling, the sintered ore is transported from the unloading point to the next process via a belt. Along the traveling direction of the trolley, the temperature of the sintered ore and hot exhaust gas of the ring cooler gradually decreases, and is correspondingly divided into a high-temperature section, a medium-temperature section and a low-temperature section. The average temperature of the hot exhaust gas in the high-temperature section is about 300~400 degrees. It enters the economizer (high-parameter economizer and low-parameter economizer, etc.) and the waste heat boiler under the machine through the ring cooling air hood, and the temperature is reduced to about 130~140 degrees. It returns to the high and medium temperature sections through the waste heat circulation fan (i.e., the second circulation fan of the present invention) to be used as cooling air; the average temperature of the hot exhaust gas in the medium temperature section is about 200~300 degrees. It enters the cascade pipe through the ring cooling air hood and is used as cooling air in the high-temperature section under the action of the medium-temperature exhaust gas cascade fan (i.e., the first circulation fan of the present invention); the average temperature of the hot exhaust gas in the low-temperature section is about 100~150 degrees. It enters the cascade pipe through the ring cooling air hood and enters the medium temperature section of the ring cooler under the action of the low-temperature exhaust gas cascade fan (i.e., the third circulation fan of the present invention) to be used as cooling air. To ensure the cooling effect of the ring cooler (reducing the average temperature of the sintered ore to below 120°C), a normal-temperature fan is installed in the low-temperature section of the ring cooler to blow normal-temperature air to cool the sintered ore. However, because the medium-temperature exhaust gas cascade fan, the waste heat circulation fan, the low-temperature exhaust gas cascade fan, and the normal-temperature fan are all arranged in parallel and have significant differences in operating temperature and pressure, the design pressure head of the waste heat circulation fan is greater than that of the medium-temperature exhaust gas cascade fan in actual operation. Without a partition, the air volume blown by the waste heat circulation fan enters the area where the medium-temperature exhaust gas cascade fan operates, increasing the resistance the medium-temperature exhaust gas cascade fan must overcome during operation and reducing the actual air volume blown by the fan at the same speed. While directly installing a blind plate partition (traditional technology) can directly suppress this cross-draft phenomenon, it lacks the flexibility to adjust according to actual operating conditions, significantly affecting the fan's operating performance, the air volume, and pressure distribution of the ring cooler, making it difficult to guarantee the air volume distribution within the air duct and the fan's operating performance. To address this shortcoming, the present invention specifically designs a series air outlet adjustment mechanism that can automatically adjust the air duct resistance distribution and a series air resistance adjustment method based on the waste heat utilization of the ring cooler corresponding to the series air outlet adjustment mechanism. This method can adjust the air duct resistance in real time by adjusting the series air outlet adjustment mechanism according to the actual operating effect and operating condition fluctuations, thereby adjusting the fan operating parameters and optimizing the air volume distribution and cooling effect of the ring cooler.

[0039] In the present invention, on the basis of the adjustable opening size of the string air outlet adjustment mechanism, the rated air volume that can be achieved by the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan at the rated speed is combined as the target value to adjust the resistance in the air duct through the adjustable string air outlet adjustment mechanism. The specific process is as follows:

[0040] (1) Obtaining the inlet pressure P of the medium-temperature hot exhaust gas circulation fan 中入 , outlet pressure P 中出 , fan operating frequency H 中 , output current A 中 , output voltage V 中 , valve opening F 中 , fan efficiency n 中 , calculate the actual blow-in flow Q of the fan 中 , the calculation process is as follows:

[0041] Shaft power W 中 = Motor output power * Motor efficiency * Transmission efficiency = Inverter output power * Motor efficiency * Transmission efficiency

[0042] =1.732*output current A 中 * Output voltage V 中 *Power factor*Inverter efficiency*Motor efficiency*Transmission efficiency (I).

[0043] In formula (I), motor efficiency ranges from 0.90 to 0.99 (for example, 0.96); transmission efficiency ranges from 0.95 to 1 (for example, 0.99); power factor ranges from 0.85 to 0.95 (for example, 0.893); and inverter efficiency ranges from 0.96 to 1 (for example, 0.994). 1.732 is the conversion factor between three-phase current and single-phase current. 3600 means there are 3600 seconds in 1 hour. 1000 is the conversion ratio between kW and W.

[0044] Actual blow-in flow rate Q of the fan 中 =3600*W 中 *1000*n 中 / (Compressibility Correction Factor*(P 中出 -P 中入 )) (II).

[0045] In formula (II), the fan efficiency n 中 Adjust according to the valve opening. According to the operating conditions of the annular cooler, the general value range is 0.7~0.9; the compressibility correction coefficient range is 0.90~0.98 (for example, 0.94).

[0046] Combining formula (I) and formula (II), we get:

[0047] Q 中 =3600*1.732*output current A 中 * Output voltage V 中 *Power factor*Inverter efficiency*Motor efficiency*Transmission efficiency*1000*Fan efficiency / (Compressibility correction factor*(P 中出 -P 中入 ))=K 中 *A 中 *V 中 * n 中 / (P 中出 -P 中入 ) (III).

[0048] In formula (III), K 中 is the operating constant of the medium temperature hot exhaust gas circulation fan, and its value range is 4438953~6515784 (i.e. 4.4×10 6 ~6.5×10 6 ). Determine according to actual working conditions.

[0049] (2) Obtaining the inlet pressure P of the waste heat exhaust gas circulation fan 循入 , outlet pressure P 循出 , fan operating frequency H 循 , output current A 循 , valve opening F 循 , fan efficiency n 循 , calculate the actual blow-in flow Q of the fan 循 The calculation process is the same as described in (1):

[0050] Q 循 =3600*1.732*output current A 循 * Output voltage V 循 *Power factor*Inverter efficiency*Motor efficiency*Transmission efficiency*1000*Fan efficiency / (Compressibility correction factor*(P 循出 -P 循入 ))=K 循 *A 循 *V 循 *n 循 / (P 循出 -P 循入 ) (IV).

[0051] In formula (IV), K 循 is the operating constant of the waste heat exhaust gas circulation fan, and its value range is 4438953~6515784 (i.e. 4.4×10 6 ~6.5×10 6 ). Determine according to actual working conditions.

[0052] (3) Obtain the sum of the actual blown air volume Q of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan 总实 and the rated value Q of the fan at this frequency 总额 Compare and judge the difference between the actual air volume and the rated value △Q=Q 总额 -Q 总实 , if Q 总实 Significantly smaller than Q 总额 , it is necessary to reduce the area of ​​the cross-section of the air flow of the adjustable cross-flow outlet adjustment mechanism; Combining formula (III) and formula (IV), we can get:

[0053] Q 总实 =Q 中 +Q 循 =K 中 ×A 中 ×V 中 ×n 中 / (P 中出 -P 中入 )+K 循 ×A 循 ×V 循 ×n 循 / (P 循出 -P 循入 ) (1).

[0054] (IV) First, calculate the rated flow rates of the high-temperature section circulation fan (i.e., medium-temperature hot exhaust gas circulation fan) and the medium-temperature section circulation fan (i.e., waste heat exhaust gas circulation fan) at the corresponding speed (current actual speed), and then calculate the material surface wind speed in the area based on the area of ​​their respective action areas (it should be noted that the material surface wind speed in the respective action areas of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan can also be directly measured by instruments):

[0055] The wind speed of the material surface in the medium temperature hot exhaust gas circulation fan action area: v1= (Q 总1 n 实1 ) / (3600n 总1 E1) (2-1).

[0056] The wind speed of the material surface in the area where the waste heat exhaust gas circulation fan works: v2= (Q 总2 n 实2 ) / (3600n 总2 E2) (2-2).

[0057] In formulas (2-1) to (2-2): v1 is the surface wind speed in the medium-temperature hot exhaust gas circulation fan action area, m / s; Q 总1 is the rated flow of the medium temperature hot exhaust gas circulation fan under full frequency operation, m 3 / h;n 实1is the actual operating frequency of the medium temperature hot exhaust gas circulation fan, Hz; n 总1 is the full frequency of the medium-temperature hot exhaust gas circulation fan, 50Hz; E1 is the area of ​​the ring cooler corresponding to the medium-temperature hot exhaust gas circulation fan, m 2 ; For waste heat exhaust gas circulation fans, the definitions of various parameters are similar to those of medium temperature waste heat exhaust gas circulation fans.

[0058] (5) Calculate the material layer resistance based on the wind speed on the material surface, and calculate P1 and P2 based on the circulation system resistance to obtain △P:

[0059] Resistance of the material layer in the action area of ​​the medium temperature hot exhaust gas circulation fan: P 料1 =1275hv1 1.67 .

[0060] Material layer resistance in the waste heat exhaust gas circulation fan action area: P 料2 =1275hv2 1.67 .

[0061] Other resistances (pipeline resistance) that the medium temperature hot exhaust gas circulation fan needs to overcome: P 其他1 =1000Pa.

[0062] Other resistances that the waste heat exhaust gas circulation fan needs to overcome (pipeline resistance + waste heat boiler resistance): P 其他2 =2000Pa.

[0063] Pressure difference △P:

[0064] △P= P2- P1=(1275hv2 1.67 +2000)-(1275hv1 1.67 +1000)=1275h(v2 1.67 - v1 1.67 )+1000 (2).

[0065] In formula (2), h is the height of the material layer, which is a measured value and is generally 1~2m. 料1 and P 料2 is the material layer resistance, Pa, and the calculation formula is the formula obtained based on experimental fitting. 其他1 and P 其他2 It is the other resistance that the fan needs to overcome during operation, Pa. Its value is generally taken based on the experience of the on-site operation process.

[0066] (6) Based on the resistance value △P that needs to be increased by the adjustment mechanism, calculate the series air outlet opening adjustment amount △A:

[0067] ΔP=(ρv3 2 ) / (2C d 2 (A-ΔA) 2) (3-1).

[0068] The above formula is transformed to: △A=A-[sqrt(ρv3 2 / △P)] / (2C d 2 ) (3).

[0069] In formula (3), ρ is the fluid density, kg / m 3 v3 is the velocity of the fluid passing through the open cross section of the regulating mechanism, m / s; C d is the flow coefficient, which varies according to different structures and is generally 0.6~0.9. A is the flow cross-sectional area corresponding to 100% opening of the regulating mechanism, m 2 .

[0070] Combining equations (2) and (3) we get:

[0071] (ρv 2 ) / (2C d 2 (A-ΔA) 2 )=1275h(v2 1.67 - v1 1.67 )+1000.

[0072] When the difference between the material layer resistance in the respective action areas of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is △P, the amount of reduction in the opening of the string air port is the calculated value △A of the above formula (3) through the string air port adjustment mechanism.

[0073] (VII) Obtain the current length L (m), height H (m), and flow area A1 (m) of the cross-section of the cross-section of the cross-section of the current cross-section of the cross-section 2 );Adjust the opening of the string air outlet through the string air outlet adjustment mechanism so that the air flow cross-sectional area is A2(m 2 ), that is, the opening of the series air outlet of the series air outlet adjustment mechanism should be adjusted to △A (A1-A2).

[0074] Generally, the air outlet of the air outlet adjustment mechanism is a rectangular air outlet, which corresponds to adjusting the resistance of the cooling air passing through the air outlet, that is, adjusting the width and / or height of the rectangular air outlet to achieve the adjustment of the opening size of the air outlet, wherein:

[0075] △A=L×H-(L-△L)×(H-△H) (4).

[0076] In formula (4), L is the width of the rectangular string air outlet before adjustment, m. ΔL is the adjustment amount of the rectangular string air outlet width, m. H is the height of the rectangular string air outlet before adjustment, m. ΔH is the adjustment amount of the rectangular string air outlet height, m.

[0077] (8) Obtain the relevant operating parameters of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan after the partition adjustment, and calculate the actual total air volume Q according to formula (1) 总实 , if Q 总实 Close to Q 总额 , then the adjustment is completed, if Q 总实 Still significantly smaller than Q 总额 , it is necessary to further reduce the opening of the string air outlet.

[0078] It should be noted that all formulas in the present invention are obtained by fitting by the inventors based on experiments and engineering applications, and all calculations are numerical values ​​converted according to prescribed units, and are obtained by substituting the converted numerical values ​​into the formulas (after converting the units, only the numerical values ​​are substituted into the formulas for calculation, without substituting the units; the units are only used to adjust the size of the numerical values).

[0079] The present invention also provides a system compatible with the above-mentioned method, which mainly includes an annular cooler, a waste heat utilization mechanism, and a cross-flow air outlet adjustment mechanism. The cross-flow air outlet adjustment mechanism is mainly arranged at the junction of the front and rear wind boxes of the high-temperature section of the annular cooler, and is used to adjust the cross-flow resistance between the front wind box area using medium-temperature hot exhaust gas as cooling air and the rear wind box area using waste heat exhaust gas as cooling air. Specifically, the cross-flow air outlet adjustment mechanism adaptively adjusts the opening of the cross-flow air outlet, thereby preventing the medium-temperature hot exhaust gas circulation fan (i.e., the first circulation fan) and the waste heat exhaust gas circulation fan (i.e., the second circulation fan) from experiencing fan efficiency incompatibility due to changes in operating conditions.

[0080] In the present invention, the vent of the vent adjustment mechanism is a rectangular vent. Its size is adjusted primarily by adjusting its width (in the width direction of the cooler, i.e., a horizontal direction perpendicular to the horizontal running direction of the trolley) and / or height (in the vertical direction of the cooler), thereby adjusting the area (i.e., the opening) of the rectangular vent. In a preferred embodiment, the vent of the vent adjustment mechanism is a rectangular vent with adjustable width and a fixed height. Specifically, the vent adjustment mechanism includes a rectangular housing, a telescopic drive device, a partition, and a foldable flexible partition. The rectangular shell is installed as a whole at the junction of the front and rear bellows of the high-temperature section. The front side wall to the rear side wall of the rectangular shell (the front is the side where the trolley comes, and the rear is the side where the trolley goes) is a through-type design (i.e., a string air outlet), and the horizontally arranged partition divides the inner cavity of the rectangular shell into an upper chamber and a lower chamber. The upper chamber is mainly used to accommodate the telescopic drive device, and the lower chamber is mainly used to accommodate a folding flexible partition. Strip-shaped through holes are opened on the partition to facilitate the connection of the telescopic drive device with the folding flexible partition. The folding flexible partition is designed to be similar to a folding fan or a folding screen structure. It is vertically arranged in the lower chamber and can be extended or folded along the width direction of the lower chamber (driven to extend or fold by the telescopic drive device), that is, the flexible adjustment of the opening size of the string air outlet is achieved by extending and folding the folding flexible partition in the width direction.

[0081] In the present invention, the telescopic drive device includes a driving source (motor or hydraulic cylinder) and a telescopic push rod. The driving source is arranged on the partition and close to the side wall of the rectangular shell in the width direction. The telescopic push rod is arranged horizontally and extends along the width direction. One end of the telescopic push rod is connected to the driving source, and the other end is connected to the top of the vertical support link located at the moving end of the folding flexible partition. That is, the driving source drives the telescopic push rod to perform reciprocating motion in the width direction, and then drives the vertical support link to perform reciprocating motion along the strip through hole opened on the partition in the width direction, thereby realizing the extension or folding operation of the folding flexible partition in the width direction. Preferably, in order to facilitate the movement of the foldable flexible partition in the width direction, a lower guide groove extending in the width direction is provided at the bottom of the lower chamber, and an upper guide groove extending in the width direction is provided on the bottom side of the partition. The upper and lower ends of the foldable flexible partition are movably mounted in the upper and lower guide grooves, respectively. That is, under the guidance of the upper and lower guide grooves, the foldable flexible partition is facilitated to move in the width direction, while also assisting in preventing air leakage from the foldable flexible partition panel. It should be noted that, in the inner cavity of the rectangular shell, the foldable flexible partition can be a single-flap design with only one leaf, and more preferably a double-flap design with a symmetrical design in the width direction, wherein the two leaves of the foldable flexible partition move relatively synchronously (approaching or moving away from each other). In addition, telescopic horizontal supports are provided at the upper and lower ends of the foldable flexible partition, which extend or fold synchronously with the foldable flexible partition along the width direction, and multiple vertical support links are provided on the panel surface of the foldable flexible partition along the width direction (it should be noted that when there are multiple vertical support links, only the vertical support link at the moving end of the foldable flexible partition is connected to the telescopic drive device). The foldable flexible partition is supported and stabilized by the telescopic horizontal supports and vertical support links.

[0082] In another preferred embodiment of the present invention, the air vent of the air vent adjustment mechanism is a rectangular air vent design with adjustable width and height, that is, the air vent adjustment mechanism includes a rectangular shell, a telescopic drive device, a platform, an oblique support, a central axis, a foldable air duct, and a telescopic elastic baffle. The structures of the rectangular shell and the telescopic drive device are consistent with the above, except that a platform is provided in the middle of the inner cavity of the rectangular shell for installing a telescopic drive device at each of the four corners of the inner cavity of the rectangular shell (the intersection corner between two adjacent side walls), and the telescopic ends of the telescopic push rods of the four telescopic drive devices all point to the geometric center point of the inner cavity of the rectangular shell. The central axis is vertically arranged and respectively connected to the center of the top wall and the center of the bottom wall of the inner cavity of the rectangular shell. In the middle of the central axis, eight oblique supports (rods) are respectively connected to the eight top corners of the inner cavity of the rectangular shell (the internal top corners formed by three adjacent side walls). For ease of description, the eight oblique supports are divided into two groups, of which the four oblique supports near the inlet of the string air port are called front oblique supports, and the four oblique supports near the outlet of the string air port are called rear oblique supports. The foldable string air duct is a flexible duct that is folded along its axial direction, that is, the axial length of the foldable string air duct is adjustable, and since it is a flexible structure, the adjustment of its tube diameter can also be achieved by pulling (or the foldable string air duct is a flexible duct that is folded along its circumference, that is, the tube diameter of the foldable string air duct is adjustable, and since it is a flexible structure, the adjustment of its axial length can also be achieved by pulling). Preferably, the foldable string air duct is a rectangular duct, comprising two rectangular elastic tube walls folded along the width direction and two elastic tube walls folded along the vertical direction, four The foldable air duct is formed by alternately splicing together one-way pipe walls at one end, and the open edge at one end is movably connected to the front oblique support, and the open edge at the other end is movably connected to the rear oblique support (for example, in a manner similar to the connection between a ring and a slide rod between a curtain and a curtain rod, or the connection between a pulley and a slide rail), that is, the inlet and outlet of the foldable air duct are respectively rectangular inlet and rectangular outlet under the support of the front oblique support and the rear oblique support, and the foldable air duct is pulled by the joint action of the front oblique support and the rear oblique support to form a penetrating rectangular air duct cavity. The two telescopic drive devices on the same side as the front oblique support are connected to the pipe wall on the inlet side of the folding air duct, and the opening size of the folding air duct inlet is adjusted by the reciprocating extension and contraction of the telescopic push rod. Similarly, the two telescopic drive devices on the same side as the rear oblique support are connected to the pipe wall on the outlet side of the folding air duct, and the opening size of the folding air duct outlet is adjusted by the reciprocating extension and contraction of the telescopic push rod. The four telescopic drive devices operate synchronously to ensure that the opening size of the folding air duct inlet and outlet is consistent.Furthermore, to ensure that the airflow uniformly flows through the folding air duct, telescopic elastic baffles are provided between the exterior of the folding air duct wall and the rectangular housing. These telescopic elastic baffles are also supported by the front or rear diagonal supports and can adjust on the front or rear diagonal supports as the diameter of the folding air duct changes. For example, the telescopic elastic baffles include two longitudinal elastic baffles folded in the width direction and two vertical elastic baffles folded in the vertical direction. The two longitudinal elastic baffles and the two vertical elastic baffles are sequentially spliced ​​circumferentially around the exterior of the folding air duct wall to form a U-shaped structure. Both the longitudinal and vertical elastic baffles are freely adjustable in width and height. Among them, two longitudinal elastic baffles are arranged on both sides of the folding air duct in the width direction, and the upper and lower ends of the longitudinal elastic baffles are respectively movably connected to the upper oblique support and the lower oblique support on the same side. The longitudinal outer end of the longitudinal elastic baffle (i.e., the end away from the folding air duct) is connected to the inner wall of the rectangular shell, and the longitudinal inner end of the longitudinal elastic baffle (i.e., the end close to the folding air duct) is connected to the outer wall of the folding air duct, that is, the extension and retraction of the longitudinal elastic baffle are synchronized with the expansion and contraction of the folding air duct. Two vertical elastic baffles are arranged on both sides of the folding air duct in the vertical direction, and the longitudinal ends of the vertical elastic baffles are respectively movably connected to the two oblique supports on the same side. The top end of the vertical elastic baffle is connected to the inner wall of the rectangular shell, and the bottom end of the vertical elastic baffle is connected to the outer wall of the folding air duct, that is, the extension and retraction of the vertical elastic baffle are also synchronized with the expansion and contraction of the folding air duct. The telescopic drive device drives the extension or retraction of the telescopic rod push rod, thereby driving the contraction and expansion of the foldable air duct lumen, and also driving the retraction and expansion of the telescopic elastic baffle. Preferably, the telescopic elastic baffle is provided on the front oblique support or the rear oblique support.

[0083] In the present invention, an inlet material blocking screen and an outlet material blocking screen are respectively provided on the two windward surfaces of the rectangular shell (i.e., the two side surfaces along the running direction of the trolley). The material blocking screen is a porous screen-type structure, which can be used to block coarser sintered ore particles, but can ensure the smooth flow of the air path, thereby reducing the wear on the string air outlet adjustment mechanism.

[0084] In the present invention, the length of extension or retraction of the telescopic push rod is controlled by controlling the starting time of the telescopic drive device, thereby indirectly controlling the width or height of the rectangular string air vent of the string air vent adjustment mechanism, and finally achieving precise adjustment of the opening size of the rectangular string air vent.

[0085] In the present invention, the width of the ring cooler is 0.5 to 20 m, preferably 1 to 15 m, and more preferably 3 to 10 m. The number of string air outlet adjustment mechanisms is 1 to 30, preferably 2 to 20, and more preferably 2 to 10. The height of the string air outlet adjustment mechanisms is 0.1 to 5 m, preferably 0.2 to 3 m, and more preferably 0.3 to 2 m.

[0086] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0087] 1: The present invention creatively proposes to set a series air outlet adjustment mechanism at the series air outlet between the medium-temperature exhaust gas circulation wind box in the high-temperature section and the waste heat exhaust gas circulation wind box, so that the opening of the series air outlet can be adjusted in real time according to the changes in the actual circulation conditions of the current medium-temperature exhaust gas and waste heat exhaust gas without changing the original structure of the wind box and changing the distribution mechanism, thereby ensuring that the air volume distribution in the air duct and the fan operation effect are in the best operating conditions, thereby significantly improving the cooling and waste heat utilization efficiency of the ring cooler.

[0088] 2: The method and system for adjusting the series air resistance for utilizing the waste heat of the ring cooler provided by the present invention have the advantages of simple overall structure, convenient process control, low investment cost, easy operation, high control accuracy, and good flexibility. In addition, it also has excellent prospects for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] Figure 1 This is a simplified diagram of the process and control logic of the method described in the present invention.

[0090] Figure 2 This is a simplified diagram of the forward structure of the system of the present invention.

[0091] Figure 3 This is a simplified diagram of the lateral structure of the system of the present invention.

[0092] Figure 4 This is a simplified diagram of a rectangular housing with two chambers according to the present invention.

[0093] Figure 5 It is a front view of the rectangular shell with double chambers of the present invention.

[0094] Figure 6 It is a side view of the structure of a rectangular housing with double chambers of the present invention.

[0095] Figure 7 This is a simplified diagram of a rectangular housing with a single chamber according to the present invention.

[0096] Figure 8 It is a top view of the rectangular housing with a single chamber according to the present invention.

[0097] Figure 9It is a side view of the rectangular housing with a single chamber of the present invention.

[0098] Reference numerals: 1: Annular cooler; 101: High temperature section; 102: Medium temperature section; 103: Low temperature section; 104: First circulation fan; 105: Second circulation fan; 106: Normal temperature fan; 107: Third circulation fan; 108: Exhaust pipe; 2: Waste heat utilization mechanism; 201: Economizer; 202: Waste heat boiler; 203: Gas transmission pipeline; 3: Casing air outlet adjustment mechanism; 301: Rectangular housing; 302: Telescopic drive device; 303: Partition; 304: Folding flexible partition; 30 5: Vertical support link; 306: Lower guide groove; 307: Upper guide groove; 308: Telescopic horizontal support; 309: Material retaining screen; 310: Platform; 311: Oblique support; 312: Central axis; 313: Folding air duct; 314: Telescopic elastic baffle; L1: First duct; L2: Second duct; L3: Third duct; L4: Normal temperature supply air duct; Y1: First pressure detector; Y2: Second pressure detector; Y3: Third pressure detector; Y4: Fourth pressure detector. DETAILED DESCRIPTION

[0099] The technical solutions of the present invention are illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0100] A system for regulating the flow resistance of waste heat from a ring cooler is described. The system includes a ring cooler 1 and a waste heat utilization mechanism 2. Based on the flow of material, the ring cooler 1 comprises a high-temperature section 101, a medium-temperature section 102, and a low-temperature section 103. The bottom bellows of the high-temperature section 101 are divided into a front bellows and a rear bellows. A flow control mechanism 3 is provided at the flow ports between the front and rear bellows.

[0101] Based on the direction of airflow, the hot exhaust gas outlet at the top of the medium-temperature section 102 is connected to the front wind box of the high-temperature section 101 via a first pipe L1. The hot exhaust gas outlet at the top of the high-temperature section 101 is connected to the air inlet of the waste heat utilization mechanism 2. The air outlet of the waste heat utilization mechanism 2 is connected to the rear wind box of the high-temperature section 101 via a second pipe L2. A first circulation fan 104 is installed in the first pipe L1, and a second circulation fan 105 is installed in the second pipe L2.

[0102] Preferably, the bottom wind box of the low-temperature section 103 is connected to a normal-temperature blower 106. The hot exhaust gas outlet at the top of the low-temperature section 103 is connected to the bottom wind box of the medium-temperature section 102 via a third pipe L3. A third circulation blower 107 is provided on the third pipe L3. Preferably, the hot exhaust gas outlet at the top of the medium-temperature section 102 is also connected to a dissipation pipe 109.

[0103] Preferably, the cross-flow air outlet adjustment mechanism 3 includes a rectangular shell 301, a telescopic drive device 302, a partition 303 and a foldable flexible partition 304. The partition 303 is horizontally arranged at the upper part of the inner cavity of the rectangular shell 301 to divide the inner cavity of the rectangular shell 301 into an upper chamber and a lower chamber, and the front and rear side walls of the lower chamber are both open-type designs to form a cross-flow air outlet. The telescopic drive device 302 is arranged in the upper chamber. The foldable flexible partition 304 is arranged in the lower chamber and is parallel to the front and rear side walls of the lower chamber. In the width direction, one end of the foldable flexible partition 304 is fixedly connected to the side wall of the lower chamber, and the other end is provided with a vertical support link 305. A strip through hole extending in the width direction is provided in the middle of the partition 303. The top of the vertical support link 305 passes through the strip through hole and is connected to the push rod of the telescopic drive device 302. The telescopic driving device 302 controls the moving distance of the vertical supporting link 305 in the strip-shaped through hole to adjust the expansion degree of the foldable flexible partition 304 in the width direction, thereby adjusting the opening degree of the string air outlet.

[0104] Preferably, a telescopic drive device 302 is provided on each side of the width of the upper chamber, and a pair of foldable flexible partitions 304 are symmetrically provided on each side of the width of the lower chamber. The two telescopic drive devices 302 control the two foldable flexible partitions 304 to move closer or further away from each other, thereby adjusting the opening of the cross-flow air vents.

[0105] Preferably, a lower guide groove 306 extending in the width direction is defined at the bottom of the lower chamber, and an upper guide groove 307 extending in the width direction is defined on the bottom side of the partition 303. The lower end of the foldable flexible partition 304 is movably mounted in the lower guide groove 306, and the upper end thereof is movably mounted in the upper guide groove 307.

[0106] Preferably, telescopic horizontal supports 308 are further provided at the upper and lower ends of the foldable flexible partition 304. Preferably, the telescopic horizontal supports 308 are sleeve-type telescopic rods.

[0107] Preferably, a material blocking screen 309 is provided at the air outlet on the front side wall of the lower chamber and at the air outlet on the rear side wall of the lower chamber.

[0108] Preferably, the air vent adjustment mechanism 3 includes a rectangular housing 301, a telescopic drive device 302, a platform 310, diagonal supports 311, a central axis 312, a foldable air duct 313, and a telescopic elastic baffle 314. The rectangular housing 301 has an inner cavity that runs through from front to back. The central axis 312 is vertically arranged at the center of the inner cavity of the rectangular housing 301. Eight diagonal supports 311 are respectively arranged at the eight corners of the inner cavity of the rectangular housing 301, and the inner ends of the eight diagonal supports 311 extend inward and connect to the middle of the central axis 312. The foldable air duct 313 is disposed within the inner cavity of the rectangular shell 301. The open edge of one end of the foldable air duct 313 is movably connected to four diagonal supports 311 located on the front side of the rectangular shell 301, and the open edge of the other end is movably connected to four diagonal supports 311 located on the rear side of the rectangular shell 301, thereby forming a rectangular air duct cavity that runs through the front and rear sides of the rectangular shell 301. Four telescopic drive devices 302 are disposed through the platform 310 at the center of the four corners of the inner cavity of the rectangular shell 301. The push rods of the telescopic drive devices 302 extend toward the center of the inner cavity of the rectangular shell 301 and are connected to the wall of the foldable air duct 313. The reciprocating motion of the push rods of the telescopic drive devices 302 drives the two ends of the foldable air duct 313 to slide synchronously on the eight diagonal supports 311, thereby controlling the opening of the rectangular air duct cavity of the foldable air duct 313. The telescopic elastic baffle 314 is a U-shaped structure, and the outer edges of the telescopic elastic baffle 314 are fixedly connected to the four inner walls of the rectangular shell 301, and the inner edges of the telescopic elastic baffle 314 are fixedly connected to the four outer walls of the folding air duct 313. The plate surface of the telescopic elastic baffle 314 is movably connected to the four oblique supports 311 on the front and / or rear sides of the rectangular shell 301, that is, the telescopic elastic baffle 314 contracts or expands as the folding air duct 313 expands or contracts.

[0109] Preferably, a material blocking screen 309 is provided at both the front opening and the rear opening of the inner cavity of the rectangular shell 301 .

[0110] Preferably, the telescopic elastic baffle 314 is a U-shaped structure formed by sequentially splicing two elastic blades folded along the width direction and two elastic blades folded along the vertical direction.

[0111] Preferably, the waste heat utilization mechanism 2 includes an economizer 201 and a waste heat boiler 202. The economizer 201 is located above the high-temperature section 101 and connected to the hot exhaust gas outlet at the top of the high-temperature section 101. The waste heat boiler 202 is located below the annular cooler. The air inlet of the waste heat boiler 202 is connected to the air outlet of the economizer 201 via a gas pipeline 203. The air inlet of the waste heat boiler 202 is connected to the second pipeline L2.

[0112] Preferably, a first pressure detector Y1 is provided on the first pipeline L1 located upstream of the first circulation fan 104 , and a second pressure detector Y2 is provided on the first pipeline L1 located downstream of the first circulation fan 104 .

[0113] Preferably, a third pressure detector Y3 is provided on the second pipeline L2 located upstream of the second circulation fan 105 , and a fourth pressure detector Y4 is provided on the second pipeline L2 located downstream of the second circulation fan 105 .

[0114] Preferably, a normal temperature air supply duct L4 is further connected to the air inlet of the third circulation fan 107 or to the third duct L3 located upstream of the third circulation fan 107.

[0115] Preferably, a material surface wind speed detector is independently provided above the material layer in the high temperature section 101, the medium temperature section 102 and the low temperature section 103. A fluid wind speed detector is also provided in the air flow regulating mechanism 3.

[0116] Example 1

[0117] like Figure 2-9 Figure 1 shows a system for regulating the flow resistance of waste heat from a ring cooler. The system includes a ring cooler 1 and a waste heat utilization mechanism 2. Based on the flow of the material, the ring cooler 1 comprises a high-temperature section 101, a medium-temperature section 102, and a low-temperature section 103. The bottom bellows of the high-temperature section 101 are divided into front and rear bellows, and a flow control mechanism 3 is installed at the flow ports between the front and rear bellows.

[0118] Based on the direction of airflow, the hot exhaust gas outlet at the top of the medium-temperature section 102 is connected to the front wind box of the high-temperature section 101 via a first pipe L1. The hot exhaust gas outlet at the top of the high-temperature section 101 is connected to the air inlet of the waste heat utilization mechanism 2. The air outlet of the waste heat utilization mechanism 2 is connected to the rear wind box of the high-temperature section 101 via a second pipe L2. A first circulation fan 104 is installed in the first pipe L1, and a second circulation fan 105 is installed in the second pipe L2.

[0119] Example 2

[0120] Example 1 was repeated, except that the bottom wind box of the low-temperature section 103 was connected to a normal-temperature blower 106. The hot exhaust gas outlet at the top of the low-temperature section 103 was connected to the bottom wind box of the medium-temperature section 102 via a third pipe L3. A third circulation blower 107 was installed on the third pipe L3.

[0121] Example 3

[0122] Example 2 is repeated, except that the hot exhaust gas outlet at the top of the medium temperature section 102 is further connected to a discharging pipe 108 .

[0123] Example 4

[0124] Repeat Example 3, as Figure 4-6 As shown, the cross-air vent adjustment mechanism 3 includes a rectangular shell 301, a telescopic drive device 302, a partition 303 and a foldable flexible partition 304. The partition 303 is horizontally arranged at the upper part of the inner cavity of the rectangular shell 301 to divide the inner cavity of the rectangular shell 301 into an upper chamber and a lower chamber, and the front and rear side walls of the lower chamber are both open-type designs to form a cross-air vent. The telescopic drive device 302 is arranged in the upper chamber. The foldable flexible partition 304 is arranged in the lower chamber and is parallel to the front and rear side walls of the lower chamber. In the width direction, one end of the foldable flexible partition 304 is fixedly connected to the side wall of the lower chamber, and the other end is provided with a vertical support link 305. A strip through hole extending in the width direction is provided in the middle of the partition 303. The top of the vertical support link 305 passes through the strip through hole and is connected to the push rod of the telescopic drive device 302. The telescopic driving device 302 controls the moving distance of the vertical supporting link 305 in the strip-shaped through hole to adjust the expansion degree of the foldable flexible partition 304 in the width direction, thereby adjusting the opening degree of the string air outlet.

[0125] Example 5

[0126] Example 4 is repeated, except that a telescopic drive device 302 is provided on each side of the upper chamber in the width direction, and a pair of foldable flexible partitions 304 are symmetrically provided on each side of the lower chamber in the width direction. The two telescopic drive devices 302 control the two foldable flexible partitions 304 to move closer or further away from each other, thereby adjusting the opening of the cross-flow air vent.

[0127] Example 6

[0128] Example 5 is repeated, except that a lower guide groove 306 extending along the width of the bottom of the lower chamber is defined, and an upper guide groove 307 extending along the width of the bottom side of the partition 303 is defined. The lower end of the foldable flexible partition 304 is movably mounted in the lower guide groove 306, and the upper end is movably mounted in the upper guide groove 307.

[0129] Example 7

[0130] Example 6 is repeated, except that telescopic horizontal supports 308 are further provided at the upper and lower ends of the foldable flexible partition 304 .

[0131] Example 8

[0132] Repeat Example 7, except that the telescopic horizontal support 308 is a sleeve-type telescopic rod.

[0133] Example 9

[0134] Example 8 is repeated, except that a material blocking screen 309 is provided at the air vents on the front side wall of the lower chamber and at the air vents on the rear side wall of the lower chamber.

[0135] Example 10

[0136] Repeat Example 1, as Figure 7-9 As shown, the cross-flow air outlet adjustment mechanism 3 includes a rectangular housing 301, a telescopic drive device 302, a platform 310, diagonal supports 311, a central axis 312, a foldable cross-flow air duct 313, and a telescopic elastic baffle 314. The rectangular housing 301 has an inner cavity that runs through from front to back. The central axis 312 is vertically arranged at the center of the inner cavity of the rectangular housing 301. Eight diagonal supports 311 are respectively arranged at the eight corners of the inner cavity of the rectangular housing 301, and the inner ends of the eight diagonal supports 311 extend inward and connect to the middle of the central axis 312. The foldable air duct 313 is disposed within the inner cavity of the rectangular shell 301. The open edge of one end of the foldable air duct 313 is movably connected to four diagonal supports 311 located on the front side of the rectangular shell 301, and the open edge of the other end is movably connected to four diagonal supports 311 located on the rear side of the rectangular shell 301, thereby forming a rectangular air duct cavity that runs through the front and rear sides of the rectangular shell 301. Four telescopic drive devices 302 are disposed through the platform 310 at the center of the four corners of the inner cavity of the rectangular shell 301. The push rods of the telescopic drive devices 302 extend toward the center of the inner cavity of the rectangular shell 301 and are connected to the wall of the foldable air duct 313. The reciprocating motion of the push rods of the telescopic drive devices 302 drives the two ends of the foldable air duct 313 to slide synchronously on the eight diagonal supports 311, thereby controlling the opening of the rectangular air duct cavity of the foldable air duct 313. The telescopic elastic baffle 314 is a U-shaped structure, and the outer edges of the telescopic elastic baffle 314 are fixedly connected to the four inner walls of the rectangular shell 301, and the inner edges of the telescopic elastic baffle 314 are fixedly connected to the four outer walls of the folding air duct 313. The plate surface of the telescopic elastic baffle 314 is movably connected to the four oblique supports 311 on the front and rear sides of the rectangular shell 301, that is, the telescopic elastic baffle 314 contracts or expands as the folding air duct 313 expands or contracts.

[0137] Example 11

[0138] Example 10 is repeated, except that a material blocking screen 309 is provided at both the front opening and the rear opening of the inner cavity of the rectangular shell 301 .

[0139] Example 12

[0140] Example 11 is repeated, except that the telescopic elastic baffle 314 is a U-shaped structure formed by sequentially splicing two elastic blades folded along the width direction and two elastic blades folded along the vertical direction.

[0141] Example 13

[0142] Repeat Example 9, as Figure 1 The waste heat utilization mechanism 2 shown here only includes an economizer 201 and a waste heat boiler 202. The economizer 201 is located above the high-temperature section 101 and has a hot exhaust gas outlet at the top of the high-temperature section 101. The waste heat boiler 202 is located below the annular cooler. The air inlet of the waste heat boiler 202 is connected to the air outlet of the economizer 201 via a gas pipeline 203. The air inlet of the waste heat boiler 202 is also connected to the second pipeline L2.

[0143] Example 14

[0144] Repeat Example 13, except that a first pressure detector Y1 is provided on the first pipeline L1 located upstream of the first circulation fan 104 , and a second pressure detector Y2 is provided on the first pipeline L1 located downstream of the first circulation fan 104 .

[0145] Example 15

[0146] Example 14 is repeated, except that a third pressure detector Y3 is provided on the second pipeline L2 located upstream of the second circulation fan 105, and a fourth pressure detector Y4 is provided on the second pipeline L2 located downstream of the second circulation fan 105.

[0147] Example 16

[0148] Repeat Example 15, except that a normal temperature air supply duct L4 is further connected to the air inlet of the third circulation fan 107.

[0149] Example 17

[0150] Example 16 was repeated, except that a material surface wind speed detector (not shown) was independently installed above the material layer in the high temperature section 101, the medium temperature section 102, and the low temperature section 103. A fluid wind speed detector (not shown) was also installed in the air flow regulating mechanism 3.

[0151] Method Example 1

[0152] The system described in Example 17 is used to cool the sintered hot ore and utilize the waste heat:

[0153] Hot sintered ore is loaded into the trolley of the ring cooler 1 and sequentially passes through the high-temperature section 101, the medium-temperature section 102, and the low-temperature section 103 for heat exchange cooling to obtain cold material. During the heat exchange cooling process, ambient temperature gas is used as cooling air for the low-temperature section 103. The low-temperature hot exhaust gas discharged from the low-temperature section 103 is circulated through the third circulation fan 108 as cooling air for the medium-temperature section 102. The medium-temperature hot exhaust gas discharged from the medium-temperature section 102 is circulated through the first circulation fan 104 as cooling air for the high-temperature section 103. The high-temperature hot exhaust gas discharged from the high-temperature section 103 is sequentially passed through the economizer 201 and the waste heat boiler 202 for waste heat utilization to obtain waste heat exhaust gas, which is then circulated through the second circulation fan 105 as cooling air for the high-temperature section 101 and the medium-temperature section 102.

[0154] During the system operation, it is detected that: the output current A of the first circulation fan 104 中 is 33.92A; the output voltage V of the first circulation fan 104 中 The fan efficiency of the first circulation fan 104 is n 中 The inlet pressure P of the first circulation fan 104 is 0.72; 中入 The outlet pressure of the first circulation fan 104 is P 中出 is 4030Pa; the operating constant K of the first circulation fan 104 中 The rated air volume Q of the first circulation fan 104 is 5498510.32; 中额 490,000m 3 / h.

[0155] The output current A of the second circulation fan 105 循 is 109.52A; the output voltage V of the second circulation fan 105 循 The fan efficiency of the second circulation fan 105 is n 循 The inlet pressure P of the second circulation fan 105 is 0.76; 循入 The outlet pressure of the second circulation fan 105 is -87Pa; 循出 The operating constant K of the second circulation fan 105 is 4630Pa; 循 The rated air volume Q of the second circulation fan 105 is 5623333.15; 循额 1080000m 3 / h. Then we have:

[0156] Q 总实 =K 中 ×A 中 ×V 中 ×n 中 / (P 中出 -P 中入 )+K循 ×A 循 ×V 循 ×n 循 / (P 循出 -P 循入 )≈1313120m 3 / h.

[0157] Because Q 总实 Less than Q 总额 (Q 中额 +Q 循额 ), and △Q=Q 总额 -Q 总实 =256880m 3 / h.

[0158] Under the current working conditions, the working drag coefficient k is 1275; the working drag constant C is 1000; and the material layer thickness h is 1.5m. The material surface wind speed v1 in the area where the medium-temperature hot exhaust gas circulation fan is active is approximately 1.36m / s. The material surface wind speed v2 in the area where the waste heat exhaust gas circulation fan is active is approximately 1.31m / s. The flow cross-sectional area A when the series air port is opened to the maximum is 2.5m 2 The fluid density ρ is 0.867 kg / m 3 Flow coefficient C d is 0.69. The fluid velocity v3 at the string air outlet is about 36.58 m / s. Then, according to formula (2) and formula (3), we can calculate:

[0159] △P=1275h(v2 1.67 -v1 1.67 )+1000≈809Pa.

[0160] △A=A-[sqrt(ρv3 2 / △P)] / (2C d 2 )≈1.24m 2 .

[0161] That is to say, under the current working conditions, when the difference between the material layer resistance in the respective action areas of the medium-temperature exhaust gas circulation fan and the waste heat exhaust gas circulation fan is about 809Pa, the string air port opening is reduced by 1.24m through the string air port adjustment mechanism. 2 .

Claims

1. A method for adjusting the blower resistance for utilizing waste heat from a ring cooler, characterized by: The string wind resistance adjustment method comprises the following steps: S1: Based on the flow of the material, the ring cooler is divided into a high-temperature section, a medium-temperature section, and a low-temperature section. The hot material passes through the high-temperature section, the medium-temperature section, and the low-temperature section in sequence for heat exchange cooling to obtain a cold material. During the heat exchange cooling process, the medium-temperature hot exhaust gas discharged from the medium-temperature section is recycled as cooling air for the high-temperature section, and the high-temperature hot exhaust gas discharged from the high-temperature section after waste heat utilization is recycled as cooling air for the high-temperature section and the medium-temperature section. Preferably, room-temperature gas is used as cooling air for the low-temperature section, and the low-temperature hot exhaust gas discharged from the low-temperature section is recycled as cooling air for the medium-temperature section. S2: Based on the real-time operating status parameters of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, establish a calculation equation for the actual total blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, and calculate the actual total blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan based on the calculation equation; if the difference between the actual total blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan and the rated total blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is not greater than the allowable difference of the operating condition, maintain the current operating condition unchanged; if the difference between the actual total blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan and the rated total blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan is greater than the allowable difference of the operating condition, proceed to the next step; S3: A cross-flow air outlet adjustment mechanism is provided at the cross-flow air outlet of the bellows adjacent to the medium-temperature hot exhaust gas action area and the waste heat exhaust gas action area in the high-temperature section; the opening of the cross-flow air outlet is adjusted by the cross-flow air outlet adjustment mechanism so that the difference between the actual blowing volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan and their rated blowing volume approaches zero.

2. The method for adjusting the wind resistance according to claim 1, characterized in that: The calculation equation is specifically: Q 总实 =K 中 ×A 中 ×V 中 ×n 中 / (P 中出 -P 中入 )+K 循 ×A 循 ×V 循 ×n 循 / (P 循出 -P 循入 ) (1); In formula (1), Q 总实 is the actual total air volume of the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, m 3 / h;K 中 is the operating constant of the medium temperature hot exhaust gas circulation fan, which is 4.4×10 6 ~6.5×10 6 ; A 串 is the output current of the medium temperature hot exhaust gas circulation fan, A; V 中 is the output voltage of the medium temperature hot exhaust gas circulation fan, V; n 中 P is the fan efficiency of the medium temperature hot exhaust gas circulation fan, which is 0.7~0.9; 中出 is the outlet pressure of the medium temperature hot exhaust gas circulation fan, Pa; P 中入 is the inlet pressure of the medium temperature hot exhaust gas circulation fan, Pa; K 循 is the operating constant of the waste heat exhaust gas circulation fan, which is 4.4×10 6 ~6.5×10 6 ; A 循 is the output current of the waste heat exhaust gas circulation fan, A; V 循 is the output voltage of the waste heat exhaust gas circulation fan, V; n 循 P is the fan efficiency of the waste heat exhaust gas circulation fan, which is 0.7~0.9; 循出 is the outlet pressure of the waste heat exhaust gas circulation fan, Pa; P 循入 is the inlet pressure of the waste heat exhaust gas circulation fan, Pa.

3. The method for adjusting the wind resistance according to claim 1 or 2, characterized in that: In step S3, the opening of the vent is adjusted by the vent adjustment mechanism as follows: first, the material layer resistance in each action area is calculated based on the material surface wind speed in each action area of ​​the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan, and the material layer resistance difference ΔP is obtained; Then, the adjustment amount △A of the string air port opening is calculated based on the obtained material layer resistance difference △P; wherein: the material layer resistance difference △P and the adjustment amount △A of the string air port opening are calculated by the following formula (2) and formula (3) respectively: <h2 style=";text-align:left;direction:ltr">△P=kh(v2<h2 style=";text-align:left;direction:ltr"> 1.67 <h2 style=";text-align:left;direction:ltr"> -v1<h2 style=";text-align:left;direction:ltr"> 1.67 <h2 style=";text-align:left;direction:ltr"> )+C (2) △A=A-[sqrt(ρv3 2 / △P)] / (2C d 2 ) (3); In formulas (2) to (3), k is the working condition drag coefficient, which ranges from 1000 to 1500; h is the material layer thickness, m; v1 is the material surface wind speed in the medium-temperature hot exhaust gas circulation fan action area, m / s; v2 is the material surface wind speed in the waste heat exhaust gas circulation fan action area, m / s; C is the working condition wind resistance constant, which ranges from 800 to 1200; A is the flow cross-sectional area when the series air port is opened to the maximum, m 2 ; ρ is the fluid density, kg / m 3 ; C d is the flow coefficient, which ranges from 0.6 to 0.9; v3 is the wind speed of the fluid passing through the string air port, m / s; when the difference between the material layer resistance in the respective action areas of the medium-temperature exhaust gas circulation fan and the waste heat exhaust gas circulation fan is △P, the string air port adjustment mechanism is used to reduce the string air port opening by the calculated value △A of the above formula (3).

4. The method for adjusting the wind resistance according to claim 3, characterized in that: The air outlet of the air outlet adjustment mechanism is a rectangular air outlet; the opening size of the air outlet is adjusted by adjusting the width and / or height of the rectangular air outlet, wherein: △A=L×H-(L-△L)×(H-△H) (4); In formula (4), L is the width of the rectangular string air outlet before adjustment, m; △L is the adjustment amount of the width of the rectangular string air outlet, m; H is the height of the rectangular string air outlet before adjustment, m; △H is the adjustment amount of the height of the rectangular string air outlet, m.

5. A system for regulating the blower resistance for utilizing waste heat from an annular cooler, or a system for regulating the blower resistance according to any one of claims 1 to 4, characterized in that: The cross-wind resistance adjustment system includes a ring cooler (1) and a waste heat utilization mechanism (2); according to the direction of the material, the ring cooler (1) includes a high-temperature section (101), a medium-temperature section (102), and a low-temperature section (103); the bottom wind box of the high-temperature section (101) is divided into a front wind box and a rear wind box, and a cross-wind outlet adjustment mechanism (3) is provided at the cross-wind outlet of the front wind box and the rear wind box; According to the direction of the air flow, the hot exhaust gas outlet at the top of the medium-temperature section (102) is connected to the front wind box of the high-temperature section (101) through the first pipe (L1); the hot exhaust gas outlet at the top of the high-temperature section (101) is connected to the air inlet of the waste heat utilization mechanism (2); the air outlet of the waste heat utilization mechanism (2) is connected to the rear wind box of the high-temperature section (101) through the second pipe (L2); a first circulation fan (104) is provided on the first pipe (L1), and a second circulation fan (105) is provided on the second pipe (L2); Preferably, the bottom wind box of the low-temperature section (103) is connected to a normal-temperature fan (106); the top hot exhaust gas outlet of the low-temperature section (103) is connected to the bottom wind box of the medium-temperature section (102) through a third pipe (L3); a third circulation fan (107) is provided on the third pipe (L3); preferably, the top hot exhaust gas outlet of the medium-temperature section (102) is also connected to a discharging pipe (108).

6. The wind resistance adjustment system according to claim 5, characterized in that: The string air outlet adjustment mechanism (3) comprises a rectangular shell (301), a telescopic drive device (302), a partition (303) and a foldable flexible partition (304); the partition (303) is horizontally arranged at the upper part of the inner cavity of the rectangular shell (301) to separate the inner cavity of the rectangular shell (301) into an upper chamber and a lower chamber, and the front and rear side walls of the lower chamber are both open-type designs to form the string air outlet; the telescopic drive device (302) is arranged in the upper chamber; the foldable flexible partition (304) is arranged in the lower chamber and is parallel to the front and rear side walls of the lower chamber; In the width direction, one end of the foldable flexible partition (304) is fixedly connected to the side wall of the lower chamber, and the other end thereof is provided with a vertical support connecting rod (305); a strip-shaped through hole extending in the width direction is opened in the middle of the partition (303); the top of the vertical support connecting rod (305) passes through the strip-shaped through hole and is connected to the push rod of the telescopic driving device (302); the telescopic driving device (302) controls the moving distance of the vertical support connecting rod (305) in the strip-shaped through hole to adjust the expansion degree of the foldable flexible partition (304) in the width direction, thereby adjusting the opening degree of the string air outlet; Preferably, a telescopic drive device (302) is provided on both sides of the width direction of the upper chamber, and a pair of foldable flexible partitions (304) are symmetrically provided on both sides of the width direction of the lower chamber; the two telescopic drive devices (302) are used to control the two foldable flexible partitions (304) to move closer to or farther from each other, thereby adjusting the opening of the string air outlet; Preferably, a lower guide groove (306) extending in the width direction is provided at the bottom of the lower chamber, and an upper guide groove (307) extending in the width direction is provided on the bottom side of the partition (303); the lower end of the foldable flexible partition (304) is movably mounted in the lower guide groove (306), and the upper end thereof is movably mounted in the upper guide groove (307); Preferably, a telescopic horizontal support (308) is further provided at the upper and lower ends of the foldable flexible partition (304); preferably, the telescopic horizontal support (308) is a sleeve-type telescopic rod; Preferably, a material blocking screen (309) is provided at the air vent on the front side wall of the lower chamber and at the air vent on the rear side wall of the lower chamber.

7. The wind resistance adjustment system according to claim 5, characterized in that: The air flow outlet adjustment mechanism (3) comprises a rectangular shell (301), a telescopic drive device (302), a platform (310), an oblique support (311), a central axis (312), a folded air flow duct (313) and a telescopic elastic baffle (314); the rectangular shell (301) has an inner cavity that passes through the front and back; the central axis (312) is vertically arranged at the center of the inner cavity of the rectangular shell (301); eight oblique supports (311) are respectively arranged at the eight top corners of the inner cavity of the rectangular shell (301), and the eight oblique supports (311) are respectively arranged at the eight top corners of the inner cavity of the rectangular shell (301). The inner ends of the supports (311) are extended inwardly and connected to the middle of the central axis (312); the folded air duct (313) is arranged in the inner cavity of the rectangular shell (301); the opening edge of one end of the folded air duct (313) is movably connected to the four oblique supports (311) located on the front side of the rectangular shell (301); the opening edge of the other end of the folded air duct (313) is movably connected to the four oblique supports (311) located on the rear side of the rectangular shell (301), thereby forming a rectangular air duct cavity running through the front and rear sides of the rectangular shell (301); in the rectangular shell Four telescopic drive devices (302) are provided in the middle of the four corners of the inner cavity of the body (301) through the platform (310), and the push rods of the telescopic drive devices (302) extend toward the inner cavity center of the rectangular shell (301) and are connected to the tube wall of the folding air duct (313); the telescopic drive devices (302) drive the two ends of the folding air duct (313) to slide synchronously on the eight oblique supports (311) through the reciprocating motion of the push rods, thereby controlling the opening of the rectangular air duct cavity of the folding air duct (313); the telescopic elastic baffle (314) is a U-shaped structure, the outer edges of the telescopic elastic baffle (314) are fixedly connected to the four inner side walls of the rectangular shell (301), the inner edges of the telescopic elastic baffle (314) are fixedly connected to the four outer side walls of the folding air duct (313), and the plate surface of the telescopic elastic baffle (314) is movably connected to the four oblique supports (311) on the front and / or rear sides of the rectangular shell (301), that is, the telescopic elastic baffle (314) contracts or expands as the folding air duct (313) expands or contracts; Preferably, a material blocking screen (309) is provided at both the front opening and the rear opening of the inner cavity of the rectangular shell (301); Preferably, the telescopic elastic baffle (314) is a U-shaped structure formed by sequentially splicing two elastic blades folded in the width direction and two elastic blades folded in the vertical direction.

8. The wind resistance adjustment system according to any one of claims 5 to 7, characterized in that: The waste heat utilization mechanism (2) comprises an economizer (201) and a waste heat boiler (202); the economizer (201) is arranged above the high temperature section (101) and connected to the hot exhaust gas outlet at the top of the high temperature section (101); the waste heat boiler (202) is arranged below the ring cooler, the air inlet of the waste heat boiler (202) is connected to the air outlet of the economizer (201) via a gas transmission pipeline (203), and the air inlet of the waste heat boiler (202) is connected to the second pipeline (L2).

9. The wind resistance adjustment system according to any one of claims 5 to 8, characterized in that: A first pressure detector (Y1) is provided on the first pipeline (L1) located upstream of the first circulation fan (104), and a second pressure detector (Y2) is provided on the first pipeline (L1) located downstream of the first circulation fan (104); and / or A third pressure detector (Y3) is provided on the second pipeline (L2) located upstream of the second circulation fan (105), and a fourth pressure detector (Y4) is provided on the second pipeline (L2) located downstream of the second circulation fan (105).

10. The air flow resistance adjustment system according to any one of claims 5 to 9, characterized in that: A normal temperature air supply duct (L4) is also connected to the air inlet of the third circulation fan (107) or to the third duct (L3) located upstream of the third circulation fan (107); Preferably, material surface wind speed detectors are independently provided above the material layers in the high temperature section (101), the medium temperature section (102) and the low temperature section (103); and a fluid wind speed detector is also provided in the air flow regulating mechanism (3).

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