A series air resistance adjusting system for waste heat utilization of a ring cooler

Abstract

To address the problem that existing fixed blind-plate partitions cannot adapt to changes in actual operating conditions, this utility model discloses a cross-flow resistance adjustment system for waste heat utilization in an annular cooler. It creatively proposes an airflow adjustment mechanism at the cross-flow port between the high-temperature section's medium-temperature exhaust gas circulation box and the waste heat exhaust gas circulation box. This mechanism can adjust the opening of the airflow port in real time according to changes in the actual circulation conditions of the medium-temperature exhaust gas and waste heat exhaust gas, thereby ensuring that the airflow distribution and fan operation within the duct are at their optimal operating conditions, significantly improving the cooling and waste heat utilization efficiency of the annular cooler. This system has advantages such as simple overall structure, convenient process control, low investment cost, ease of operation, high control precision, and good flexibility. Furthermore, it has excellent prospects for large-scale promotion and application.

Description

Technical Field

[0001] This utility model relates to cooling processes and equipment for iron and steel smelting, specifically to a series air resistance adjustment system for utilizing waste heat from an annular cooler, belonging to the field of iron and steel smelting cooling technology. Background Technology

[0002] With the introduction of policies promoting extreme energy efficiency and ultra-low emissions in the steel industry, sintered ore cooling systems centered on annular coolers are developing towards lower energy consumption, higher waste heat utilization efficiency, and less exhaust emissions. A series of new technologies, including cascade utilization and stepped air supply, have been introduced. However, the parallel fans in the annular cooler's blower system exhibit inconsistent parameters such as air volume, air temperature, and air pressure, significantly increasing mutual interference between fans. This, in turn, greatly impacts the actual blower performance and system energy consumption. Currently, to reduce the interference between adjacent parallel fans, especially between the air box in the high-temperature section of the annular cooler's medium-temperature cascade fan and the air box in the high-temperature section's waste heat circulation fan, a blind plate partition is often installed inside the annular cooler's air box duct. However, in actual operation, although this method can effectively prevent mutual interference between fans, it is affected by the large fluctuations in the operating conditions of the annular cooler. Especially for parallel fans with large differences in operating parameters (particularly between medium-temperature cascade fans and waste heat circulation fans), the location of the air box partition is not easy to control. Moreover, once the existing blind plate partition is installed, it is difficult to adjust it according to the actual situation during operation, which will greatly affect the operating effect of the fans, the air volume and pressure distribution of the annular cooler, and thus affect the energy consumption of the fans and the cooling effect of the annular cooler. Utility Model Content

[0003] To address the problem in existing technologies where a fixed blind-plate partition exists between the high-temperature section air boxes of the medium-temperature cascade fan and the waste heat circulation fan, making adaptive adjustment impossible, this invention provides a cascade resistance adjustment system for waste heat utilization in an annular cooler. By designing an adjustable cascade outlet mechanism to replace the existing blind-plate structure, the system can precisely adjust the cascade outlet opening based on real-time changes in the operating parameters of the medium-temperature hot waste gas circulation fan and the waste heat waste gas circulation fan. This ensures the operational effectiveness of both fans, reduces fan energy consumption while maintaining stable material cooling effects, and further guarantees and improves the waste heat utilization efficiency of the annular cooler.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] A system for regulating the airflow resistance of a ring cooler for waste heat utilization is disclosed. The system includes a ring cooler and a waste heat utilization mechanism. Based on the material flow direction, the ring cooler comprises a high-temperature section, a medium-temperature section, and a low-temperature section. The bottom air box of the high-temperature section is divided into a front air box and a rear air box, and an airflow regulating mechanism is installed at the airflow inlets of the front and rear air boxes.

[0006] Based on the airflow direction, the top hot exhaust gas outlet of the intermediate temperature section is connected to the front air box of the high temperature section via a first pipe. The top hot exhaust gas outlet of the high temperature section is connected to the air inlet of the waste heat utilization mechanism. The air outlet of the waste heat utilization mechanism is connected to the rear air box of the high temperature section via a second pipe. A first circulating fan (i.e., an intermediate temperature hot exhaust gas circulating fan) is installed on the first pipe, and a second circulating fan (i.e., a waste heat exhaust gas circulating fan) is installed on the second pipe.

[0007] Preferably, the bottom air box of the low-temperature section is connected to a normal-temperature fan. The top hot exhaust gas outlet of the low-temperature section is connected to the bottom air box of the medium-temperature section via a third pipe. A third circulating fan (i.e., a low-temperature hot exhaust gas circulating fan) is installed on the third pipe. Preferably, the top hot exhaust gas outlet of the medium-temperature section is also connected to a discharge pipe.

[0008] Preferably, the air vent adjustment mechanism includes a rectangular shell, a telescopic drive device (preferably a drive device composed of a hydraulic cylinder and a telescopic push rod), a partition, and a folding flexible partition (similar to the structure of a folding screen or a folding paper fan). The partition is horizontally arranged in the upper part of the inner cavity of the rectangular shell, dividing the inner cavity of the rectangular shell into an upper chamber and a lower chamber. The front and rear side walls of the lower chamber ("front" refers to the upstream side of the material running on the annular cooler, and "rear" refers to the downstream side of the material running on the annular cooler) are open, thus forming an air vent. The telescopic drive device is located in the upper chamber. The folding flexible partition is located in the lower chamber and is parallel to the front and rear side walls of the lower chamber. In the width direction (referring to the horizontal direction perpendicular to the material running direction on the annular cooler, i.e., the width direction of the annular cooler), one end of the folding flexible partition is fixedly connected to the side wall of the lower chamber, and the other end is provided with a vertical support rod. A strip-shaped through hole extending in the width direction is opened in the middle of the partition. The top of the vertical support link passes through the strip-shaped through hole and connects 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, adjusting the unfolding degree of the folding flexible partition in the width direction, thereby adjusting the opening degree of the air vent.

[0009] Preferably, a telescopic drive device is provided on each side of the upper chamber in the width direction, and a pair of folding flexible partitions are symmetrically arranged on each side of the lower chamber in the width direction. The two telescopic drive devices control the two folding flexible partitions to move closer or further apart, thereby adjusting the opening of the air vents.

[0010] 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 folding flexible partition is movably installed in the lower guide groove, and its upper end is movably installed in the upper guide groove.

[0011] Preferably, telescopic horizontal supports are also provided at the upper and lower ends of the folding flexible partition. Preferably, the telescopic horizontal supports are sleeve-type telescopic rods.

[0012] Preferably, baffle screens are installed at the air vents on both the front and rear sides of the lower chamber.

[0013] Preferably, the air vent adjustment mechanism includes a rectangular shell, a telescopic drive device, a platform, diagonal supports, a central shaft, a folded air duct, and a telescopic elastic baffle. The rectangular shell has a through-cavity. The central shaft is vertically positioned at the center of the rectangular shell's cavity. Eight diagonal supports are respectively positioned at the eight apex corners of the rectangular shell's cavity, and the inner ends of all eight diagonal supports extend inward and connect to the center of the central shaft. The folded air duct is disposed within the rectangular shell's cavity. The opening edge of one end of the folded air duct is movably connected to four diagonal supports located on the front side of the rectangular shell, and the opening edge of the other end is movably connected to four diagonal supports located on the rear side of the rectangular shell (e.g., in a manner similar to the connection between a ring and a sliding rod, or a pulley and a sliding rail, similar to the connection between a curtain and a curtain rod), thus forming a rectangular air duct cavity that runs through the front and rear sides of the rectangular shell. Four telescopic drive devices are installed at the midpoint of the four corners of the rectangular shell cavity via platforms. The push rods of the telescopic drive devices extend toward the center of the rectangular shell cavity and connect to the wall of the folded ventilation duct. The telescopic drive devices drive the two ends of the folded ventilation duct to slide synchronously on the eight diagonal supports through the reciprocating motion of the push rods, thereby controlling the opening of the rectangular ventilation duct cavity of the folded ventilation duct. The telescopic elastic baffle has a U-shaped structure. The outer edge of the telescopic elastic baffle is fixedly connected to the four inner sidewalls of the rectangular shell, and the inner edge of the telescopic elastic baffle is fixedly connected to the four outer sidewalls of the folded ventilation duct. The surface of the telescopic elastic baffle is movably connected to the four diagonal supports on the front and / or rear sides of the rectangular shell (for example, in a manner similar to the connection between a ring and a sliding rod or a pulley and a slide rail between a curtain and a curtain rod), that is, the telescopic elastic baffle contracts or expands as the folded ventilation duct expands or contracts.

[0014] Preferably, a baffle screen is provided at both the front and rear openings of the inner cavity through the rectangular shell.

[0015] Preferably, the telescopic elastic baffle is a U-shaped structure formed by sequentially splicing together two elastic blades folded along the width direction (which can be folded and retracted in the width direction and elastically stretched and retracted in the vertical direction) and two elastic blades folded along the vertical direction (which can be folded and retracted in the vertical direction and elastically stretched and retracted in the width direction).

[0016] 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 top hot waste gas outlet of the high-temperature section. The waste heat boiler is positioned below the annular cooler, with its inlet connected to the economizer's outlet via a gas pipeline, and its inlet also connected to a second pipeline.

[0017] Preferably, a first pressure gauge is installed on the first pipe upstream of the first circulating fan, and a second pressure gauge is installed on the first pipe downstream of the first circulating fan.

[0018] Preferably, a third pressure gauge is installed on the second pipe upstream of the second circulating fan, and a fourth pressure gauge is installed on the second pipe downstream of the second circulating fan.

[0019] Preferably, a normal temperature make-up air pipe is also connected at the air inlet of the third circulating fan or on the third pipe located upstream of the third circulating fan.

[0020] Preferably, material surface velocity meters are independently installed above the material layers in the high-temperature, medium-temperature, and low-temperature sections. Fluid velocity meters are also installed in the air inlet regulating mechanism.

[0021] The production steps using the system of this utility model are as follows:

[0022] S1: Based on the material flow, the annular cooler is divided into a high-temperature section, a medium-temperature section, and a low-temperature section. Hot material passes through these sections sequentially for heat exchange and cooling, resulting in cold material. During the heat exchange and cooling process: the medium-temperature hot exhaust gas discharged from the medium-temperature section is recirculated as cooling air for the high-temperature section; the waste heat exhaust gas discharged from the high-temperature section, after waste heat utilization, is recirculated as cooling air for both 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 recirculated as cooling air for the medium-temperature section.

[0023] S2: Based on the real-time operating parameters of the medium-temperature hot waste gas recirculation fan and the waste heat waste gas recirculation fan, establish a calculation equation for the actual total air volume of the two fans. Calculate the actual total air volume of the two fans based on this equation. If the difference between the actual total air volume and the rated total air volume of the two fans is not greater than the allowable difference under operating conditions, maintain the current operating conditions. If the difference between the actual total air volume and the rated total air volume of the two fans is greater than the allowable difference under operating conditions (the allowable difference generally does not exceed 10% of the total volume of the rated total air volume), proceed to the next step (i.e., proceed to step S3).

[0024] S3: A vent adjustment mechanism is installed at the air vent of the air box adjacent to the medium-temperature hot waste gas action zone and the waste heat waste gas action zone in the high-temperature section. By adjusting the opening of the vent through the vent adjustment mechanism, the difference between the actual blowing volume of the medium-temperature hot waste gas circulation fan and the waste heat waste gas circulation fan and their rated blowing volume approaches zero (the ideal state should be zero).

[0025] Preferably, the calculation equation is as follows:

[0026] 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)

[0027] In equation (1), Q 总实 The actual total air volume (m³) of the medium-temperature hot exhaust gas recirculation fan and the waste heat exhaust gas recirculation fan. 3 / h. K 中 The operating constant for the medium-temperature hot waste gas recirculation fan is taken as 4.4 × 10⁻⁶. 6 ~6.5×10 6 A 串 The output current (A) of the medium-temperature hot waste gas recirculation fan is given by V. 中 The output voltage of the medium-temperature hot waste gas circulation fan is V. 中 The efficiency of the medium-temperature hot waste gas circulation fan is taken as 0.7~0.9. P 中出 P represents the outlet pressure of the medium-temperature hot waste gas recirculation fan, in Pa.中入 The inlet pressure of the medium-temperature hot exhaust gas recirculation fan is expressed in Pa and K. 循 The operating constant of the waste heat and exhaust gas circulation fan is taken as 4.4 × 10⁻⁶. 6 ~6.5×10 6 A 循 The output current of the waste heat and exhaust gas circulation fan is measured in A and V. 循 n is the output voltage, V, of the waste heat and exhaust gas circulation fan. 循 The efficiency of the waste heat and exhaust gas recirculation fan is taken as 0.7~0.9. P 循出 P represents the outlet pressure of the waste heat and exhaust gas circulation fan, in Pa. 循入 The inlet pressure of the waste heat and exhaust gas circulation fan is Pa.

[0028] Preferably, in step S3, adjusting the opening of the air vent through the air vent adjustment mechanism specifically involves: first, calculating the material layer resistance within the respective operating areas of the medium-temperature hot waste gas circulation fan and the waste heat waste gas circulation fan, and obtaining the material layer resistance difference ΔP (Pa). Then, calculating the adjustment amount ΔA (m) of the air vent opening based on the obtained material layer resistance difference ΔP. 2 Among them, the difference in material layer resistance ΔP and the adjustment amount ΔA of the air vent opening are calculated by the following formulas (2) and (3), respectively:

[0029] △P=kh(v2 1.67 -v1 1.67 )+C (2).

[0030] △A=A-[sqrt(ρv3 2 / △P)] / (2C d 2 (3)。

[0031] In equations (2)-(3), k is the working condition drag coefficient, with a value of 1000~1500. C is the working condition drag constant, with a value of 800~1200. h is the material layer thickness, in meters. v1 is the surface velocity of the material in the area where the medium-temperature hot waste gas circulating fan operates, in meters per second. v2 is the surface velocity of the material in the area where the waste heat waste gas circulating fan operates, in meters per second. A is the flow cross-sectional area when the vent opening is at its maximum, in meters. 2 ρ is the fluid density, kg / m³ 3 C d is the flow coefficient, with a value ranging from 0.6 to 0.9. v3 is the fluid velocity at the air inlet, in m / s.

[0032] When the difference between the material layer resistance in the respective working areas of the medium-temperature waste gas circulation fan and the waste heat waste gas circulation fan is △P, the amount of reduction in the opening of the air vent through the air vent adjustment mechanism is the calculated value △A of the above formula (3).

[0033] Preferably, the air vent of the air vent adjustment mechanism is a rectangular air vent. The opening size of the air vent is adjusted by adjusting the width and / or height of the rectangular air vent, wherein:

[0034] △A=L×H-(L-△L)×(H-△H) (4).

[0035] In equation (4), L is the width of the rectangular air vent before adjustment, in meters. △L is the adjustment amount of the width of the rectangular air vent, in meters. H is the height of the rectangular air vent before adjustment, in meters. △H is the adjustment amount of the height of the rectangular air vent, in meters.

[0036] In the existing technology, the sinter at the tail end 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 air box, the air box is connected to the blower, and the upper part of the trolley is connected to the ring cooler shroud. During the forward movement of the trolley, the cooling air blown out by the blower passes through the air box and is directly sent into the material layer from the bottom of the trolley to cool the sinter. After cooling, the hot exhaust gas enters the ring cooler shroud from the upper part of the material layer for waste heat recovery and utilization. After cooling, the sinter is conveyed to the next process by a belt conveyor from the discharge point. Along the direction of the trolley's movement, the temperature of the sintered ore and hot exhaust gas in the annular cooler gradually decreases, correspondingly dividing 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 Celsius. It enters the economizer (high-parameter economizer and low-parameter economizer, etc.) and the waste heat boiler under the machine through the annular cooler hood, where the temperature drops to about 130-140 degrees Celsius. It then returns to the high and medium-temperature sections as cooling air through the waste heat circulation fan (i.e., the second circulation fan of this utility model). The average temperature of the hot exhaust gas in the medium-temperature section is about 200-300 degrees Celsius. It enters the cascade pipe through the annular cooler 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 this utility model). The average temperature of the hot exhaust gas in the low-temperature section is about 100-150 degrees Celsius. It enters the cascade pipe through the annular cooler hood and enters the medium-temperature section of the annular cooler as cooling air under the action of the low-temperature exhaust gas cascade fan (i.e., the third circulation fan of this utility model). To ensure the cooling effect of the annular cooler (reducing the average temperature of the sinter to below 120 degrees Celsius), a normal-temperature fan is installed in the low-temperature section of the annular cooler to blow in normal-temperature air to cool the sinter. However, since the medium-temperature exhaust gas cascade fan, waste heat circulation fan, low-temperature exhaust gas cascade fan, and normal-temperature fan are all arranged in parallel, and there are significant differences in their operating temperatures and pressures, the design head of the waste heat circulation fan will be greater than that of the medium-temperature exhaust gas cascade fan during actual operation. If no partition is installed, the air volume blown in by the waste heat circulation fan will enter the area where the medium-temperature exhaust gas cascade fan operates, thereby increasing the resistance that the medium-temperature exhaust gas cascade fan needs to overcome during operation and reducing the actual air volume blown in at the same speed. On the other hand, if a blind plate partition (traditional process) is directly installed, although it can directly suppress the cross-flow phenomenon, it cannot be flexibly adjusted according to changes in actual operating conditions, which will significantly affect the operating effect of the fan, the air volume and pressure distribution of the annular cooler, and make it difficult to guarantee the air volume distribution and fan operating effect within the duct. To address this deficiency, this 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 annular 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 annular cooler.

[0037] In this invention, based on the adjustable air vent opening size of the air vent adjustment mechanism, and taking the rated air volume that the medium-temperature hot exhaust gas circulation fan and the waste heat exhaust gas circulation fan can achieve at rated speed as the target value, the resistance inside the air duct is adjusted through the adjustable air vent adjustment mechanism. The specific process is as follows:

[0038] (a) Obtain the inlet pressure P of the medium-temperature hot exhaust gas circulating fan 中入 Export pressure P 中出 Fan operating frequency H 中 Output current A 中 Output voltage V 中 Valve opening degree F 中 Fan efficiency n 中 Calculate the actual inflow rate Q of the fan. 中 The calculation process is as follows:

[0039] Shaft power W 中 =Motor output power * Motor efficiency * Transmission efficiency = Inverter output power * Motor efficiency * Transmission efficiency

[0040] =1.732 * output current (A) 中 *Output voltage V 中 *Power factor*Inverter efficiency*Motor efficiency*Transmission efficiency (I).

[0041] In formula (I), the motor efficiency ranges from 0.90 to 0.99 (e.g., 0.96); the transmission efficiency ranges from 0.95 to 1 (e.g., 0.99); the power factor ranges from 0.85 to 0.95 (e.g., 0.893); and the inverter efficiency ranges from 0.96 to 1 (e.g., 0.994). Where: 1.732 is the conversion factor between three-phase and single-phase current. 3600 refers to 1 hour having 3600 seconds. 1000 is the conversion ratio between kW and W.

[0042] Actual blower flow rate Q 中 =3600*W 中 *1000*n 中 / (compressibility correction factor*(P) 中出 -P 中入 (II).

[0043] In equation (II), the fan efficiency n 中 Adjustments are made according to the valve opening, and the value is generally taken in the range of 0.7 to 0.9 depending on the operation of the annular cooler; the compressibility correction factor is taken in the range of 0.90 to 0.98 (for example, 0.94).

[0044] Combining equations (I) and (II), we get:

[0045] 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).

[0046] In equation (III), K 中 The operating constant for the medium-temperature hot waste gas circulation fan ranges from 4,438,953 to 6,515,784 (i.e., 4.4 × 10⁻⁶). 6 ~6.5×10 6 The determination will be made based on the actual working conditions.

[0047] (ii) Obtain the inlet pressure P of the waste heat exhaust gas circulation fan 循入 Export pressure P 循出 Fan operating frequency H 循 Output current A 循 Valve opening degree F 循 Fan efficiency n 循 Calculate the actual inflow rate Q of the fan. 循 The calculation process is the same as described in (I):

[0048] 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).

[0049] In equation (IV), K 循 The operating constant of the waste heat and exhaust gas circulation fan ranges from 4,438,953 to 6,515,784 (i.e., 4.4 × 10⁻⁶). 6 ~6.5×10 6 The determination will be made based on the actual working conditions.

[0050] (iii) Obtain the sum of the actual air volume Q of the medium-temperature hot waste gas circulation fan and the waste heat waste gas circulation fan. 总实 and the rated value Q of both the wind turbine and the wind turbine at that frequency. 总额 Compare the actual blown air volume with the rated value to determine the difference △Q=Q. 总额 -Q 总实 If Q 总实 Significantly smaller than Q 总额 Therefore, it is necessary to reduce the area of ​​the airflow cross-section of the adjustable air vent regulating mechanism; combining equations (III) and (IV), we get:

[0051] 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)。

[0052] (iv) First, calculate the rated flow rate of the high-temperature section circulating fan (i.e., the medium-temperature hot exhaust gas circulating fan) and the medium-temperature section circulating fan (i.e., the waste heat exhaust gas circulating fan) at the corresponding speed (current actual speed), and then calculate the material surface wind speed in the area of ​​their respective working area (it should be noted that the material surface wind speed in the working area of ​​the medium-temperature hot exhaust gas circulating fan and the waste heat exhaust gas circulating fan can also be obtained directly by instruments):

[0053] The surface velocity of the material in the working area of ​​the medium-temperature hot waste gas circulating fan is: v1 = (Q 总1 n 实1 ) / (3600n 总1 E1) (2-1).

[0054] The surface wind speed in the area affected by the waste heat and exhaust gas circulation fan is: v2 = (Q 总2 n 实2 ) / (3600n 总2 E2) (2-2).

[0055] In equations (2-1) to (2-2): v1 is the surface wind velocity of the material in the working area of ​​the medium-temperature hot waste gas circulating fan, m / s; Q 总1 The rated flow rate (m) of the medium-temperature hot waste gas recirculation fan under full-frequency operation. 3 / h;n 实1The actual operating frequency of the medium-temperature hot exhaust gas recirculation fan is in Hz; n 总1 E1 represents the full-frequency operation of the medium-temperature hot exhaust gas recirculation fan, at 50Hz; E1 is the area of ​​the annular cooler's working region corresponding to the medium-temperature hot exhaust gas recirculation fan, in m². 2 For waste heat exhaust gas recirculation fans, the parameter definitions are similar to those for medium-temperature waste heat exhaust gas recirculation fans.

[0056] (v) Calculate the material layer resistance based on the surface wind speed, and combine it with the circulation system resistance to calculate P1 and P2, thus obtaining ΔP:

[0057] Resistance of the material layer in the working area of ​​the medium-temperature hot waste gas circulating fan: P 料1 =1275hv1 1.67 .

[0058] Resistance of the material layer in the working area of ​​the waste heat and exhaust gas circulation fan: P 料2 =1275hv2 1.67 .

[0059] Other resistances (pipeline resistance) that medium-temperature hot waste gas recirculation fans need to overcome: P 其他1 =1000Pa.

[0060] Other resistances that the waste heat and exhaust gas circulation fan needs to overcome (pipeline resistance + waste heat boiler resistance): P 其他2 =2000Pa.

[0061] Pressure difference ΔP:

[0062] △P = P2 - P1 = (1275hv2) 1.67 +2000)-(1275hv1 1.67 +1000)=1275h(v2 1.67 - v1 1.67 )+1000 (2).

[0063] In equation (2), h is the material layer height, a measured value, generally 1~2m. P 料1 and P 料2 Let P be the resistance of the material bed, expressed in Pa. The calculation formula is based on experimental fitting. 其他1 and P 其他2 Other resistances that the wind turbine needs to overcome during operation, Pa, are generally taken from empirical values ​​obtained during on-site operation.

[0064] (vi) Based on the resistance value △P that needs to be increased through the adjustment mechanism, calculate the adjustment amount △A of the air outlet opening:

[0065] ΔP=(ρv3 2 ) / (2C d 2 (A-ΔA) 2(3-1).

[0066] The above equation, after transformation, yields: △A = A - [sqrt(ρv3)] 2 / △P)] / (2C d 2 (3)。

[0067] In equation (3), ρ is the fluid density, kg / m³. 3 v3 represents the velocity of the fluid passing through the open section of the regulating mechanism, in m / s; C d is the flow coefficient, which varies depending on the structure, generally ranging from 0.6 to 0.9. A is the flow cross-sectional area corresponding to the regulating mechanism opening at 100%, in meters. 2 .

[0068] Combining equations (2) and (3), we get:

[0069] (ρv 2 ) / (2C d 2 (A-ΔA) 2 )=1275h(v2 1.67 - v1 1.67 )+1000.

[0070] When the difference between the material layer resistance in the respective working areas of the medium-temperature waste gas circulation fan and the waste heat waste gas circulation fan is △P, the amount of reduction in the opening of the air vent through the air vent adjustment mechanism is the calculated value △A of the above formula (3).

[0071] (vii) Obtain the existing length L (m), height H (m), and flow area A1 (m²) of the current airflow cross-section of the airflow regulating mechanism. 2 The opening of the air vent is adjusted by the air vent regulating mechanism to make the airflow cross-sectional area reach A2 (m²). 2 That is, the opening of the air vent of the air vent adjustment mechanism should be adjusted by △A (A1-A2).

[0072] Generally, the air vent adjustment mechanism uses a rectangular air vent. Adjusting the resistance of the cooling air through the air vent is achieved by adjusting the width and / or height of the rectangular air vent, thus adjusting the air vent opening.

[0073] △A=L×H-(L-△L)×(H-△H) (4).

[0074] In equation (4), L is the width of the rectangular air vent before adjustment, in meters. △L is the adjustment amount of the width of the rectangular air vent, in meters. H is the height of the rectangular air vent before adjustment, in meters. △H is the adjustment amount of the height of the rectangular air vent, in meters.

[0075] (viii) 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 If Q 总实 Still significantly smaller than Q 总额 If so, the opening of the air vent needs to be further reduced.

[0076] It should be noted that all formulas in this utility model are obtained by the inventor based on experiments and engineering applications, and all calculations are obtained by converting values ​​according to the specified units and substituting the converted values ​​into the formulas (after converting the units, only the values ​​are substituted into the formulas for calculation, not the units; the units are only used to adjust the size of the values).

[0077] In this invention, the regulating system mainly includes an annular cooler, a waste heat utilization mechanism, and a vent regulating mechanism. The vent regulating mechanism is mainly located at the junction of the front and rear air boxes in the high-temperature section of the annular cooler. It is used to adjust the airflow resistance between the front air box area (using medium-temperature hot waste gas as cooling air) and the rear air box area (using waste heat waste gas as cooling air). Specifically, the vent regulating mechanism adaptively adjusts the opening of the vents, thereby ensuring that the medium-temperature hot waste gas circulating fan (i.e., the first circulating fan) and the waste heat waste gas circulating fan (i.e., the second circulating fan) do not experience inefficiencies due to changes in operating conditions.

[0078] In this invention, the air inlet of the air outlet adjustment mechanism is a rectangular air inlet. Its size is adjusted primarily by regulating the width (the width direction of the annular cooler, i.e., another horizontal direction perpendicular to the trolley's horizontal running direction) and / or height (the vertical direction of the annular cooler), thereby adjusting the area (i.e., opening) of the rectangular air inlet. In a preferred embodiment, the air inlet of the air outlet adjustment mechanism is designed as a rectangular air inlet with adjustable width but constant height. That is, the air inlet adjustment mechanism includes a rectangular shell, a telescopic drive device, a partition, and a foldable flexible partition, etc. The rectangular shell is installed at the junction of the front and rear air boxes in the high-temperature section. The front and rear side walls of the rectangular shell (the front is the side where the trolley comes from, and the rear is the side where the trolley goes) are designed as a through-hole (i.e., air vent). A 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 house the telescopic drive device, and the lower chamber is mainly used to house the folding flexible partition. The partition has strip-shaped through holes to facilitate the connection between the telescopic drive device and the folding flexible partition. The folding flexible partition is designed like a folding fan or folding screen. It is vertically installed in the lower chamber and can be extended or folded along the width of the lower chamber (driven by the telescopic drive device). In other words, the opening size of the air vent can be flexibly adjusted by extending and folding the folding flexible partition in the width direction.

[0079] In this invention, the telescopic drive device includes a drive source (motor or hydraulic cylinder) and a telescopic push rod. The drive source is set on the partition and close to the side wall in the width direction of the rectangular shell. The telescopic push rod is set horizontally and extends in the width direction. One end of the telescopic push rod is connected to the drive 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 drive source drives the telescopic push rod to reciprocate in the width direction, thereby driving the vertical support link to reciprocate along the strip-shaped through hole opened on the partition in the width direction, and finally realizes the extension or folding operation of the folding flexible partition in the width direction. Preferably, to facilitate better movement of the folding 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 folding flexible partition are respectively movably installed in the upper and lower guide grooves. That is, under the guidance of the upper and lower guide grooves, the folding flexible partition moves better in the width direction, and also helps to prevent air leakage from the folding flexible partition panel. It should be noted that in the inner cavity of the rectangular shell, the folding flexible partition can be a single-panel design with only one panel, and more preferably a double-panel design with a symmetrical design in the width direction, where the two folding flexible partitions move synchronously (approaching or moving away from each other). In addition, telescopic horizontal supports are provided at the upper and lower ends of the folding flexible partition, which extend or fold synchronously with the folding flexible partition along the width direction. Multiple vertical support rods are also provided on the panel surface of the folding flexible partition along the width direction (it should be noted that when there are multiple vertical support rods, only the vertical support rods at the moving end of the folding flexible partition are connected to the telescopic drive device). The telescopic horizontal supports and vertical support rods provide support and stability for the folding flexible partition.

[0080] In another preferred embodiment of this utility model, the air vent adjustment mechanism features a rectangular air vent design with adjustable width and height. Specifically, the air vent adjustment mechanism includes a rectangular shell, a telescopic drive device, a platform, diagonal supports, a central shaft, a folded air duct, and telescopic elastic baffles. The structures of the rectangular shell and the telescopic drive device are consistent with those described above, except that a platform is provided in the middle of the rectangular shell's inner cavity for mounting a telescopic drive device at each of the four corners (intersection corners between two adjacent side walls) of the rectangular shell's inner cavity. The retracted ends of the telescopic push rods of the four telescopic drive devices all point to the geometric center of the rectangular shell's inner cavity. The central shaft is vertically positioned and connected to the center of the top and bottom walls of the rectangular shell's inner cavity. Eight diagonal supports (rods) are distributed along the central shaft and connected to the eight apex corners (internal apex corners formed by three adjacent side walls) of the rectangular shell's inner cavity. For ease of description, the eight diagonal supports are divided into two groups. The four diagonal supports near the air inlet are called the front diagonal supports, and the four diagonal supports near the air outlet are called the rear diagonal supports. The folded air duct is a flexible duct folded along its axial direction, meaning its axial length is adjustable. Due to its flexible structure, its diameter can also be adjusted by pulling (or the folded air duct is a flexible duct folded circumferentially, meaning its diameter is adjustable, and its axial length can also be adjusted by pulling). Preferably, the folded air duct is a rectangular duct, comprising two rectangular elastic pipe walls folded along the width direction and two elastic pipe walls folded along the vertical direction. (The folded ventilation duct is formed by alternating splicing of one-way pipe walls). The opening edge of one end of the folded ventilation duct is movably connected to the front diagonal support, and the opening edge of the other end is movably connected to the rear diagonal support (for example, in a way similar to the connection between a ring and a sliding rod or a pulley and a sliding rail between a curtain and a curtain rod). That is, the inlet and outlet of the folded ventilation duct are rectangular inlet and rectangular outlet under the support of the front diagonal support and the rear diagonal support, respectively. Through the combined action of the front diagonal support and the rear diagonal support, the folded ventilation duct is pulled to form a through rectangular ventilation cavity. Two telescopic drive devices on the same side as the front diagonal support are connected to the pipe wall on the inlet side of the folded ventilation duct, and adjust the opening of the folded ventilation duct inlet by reciprocating extension and retraction of the telescopic push rod. Similarly, two telescopic drive devices on the same side as the rear diagonal support are connected to the pipe wall on the outlet side of the folded ventilation duct, and adjust the opening of the folded ventilation duct outlet by reciprocating extension and retraction of the telescopic push rod. The four telescopic drive devices operate synchronously to ensure that the opening of the folded ventilation duct inlet and outlet is consistent.In addition, to ensure that all airflow passes through the folded ventilation duct, telescopic elastic baffles are installed between the outer wall of the folded ventilation duct and the rectangular shell. These telescopic elastic baffles are supported by either a front or rear diagonal support and can adjust according to the diameter of the folded ventilation duct. For example, the telescopic elastic baffles consist of two longitudinal elastic baffles folded along the width direction and two vertical elastic baffles folded along the vertical direction. The two longitudinal and two vertical elastic baffles are sequentially spliced ​​circumferentially around the outer wall of the folded ventilation duct to form a U-shaped structure. Both the longitudinal and vertical elastic baffles can be freely adjusted in width and height. Two longitudinal elastic baffles are installed on both sides of the folded air duct in the width direction. The upper and lower ends of each longitudinal elastic baffle are movably connected to the upper and lower diagonal supports on the same side, respectively. The outer longitudinal end of the longitudinal elastic baffle (the end furthest from the folded air duct) is connected to the inner wall of the rectangular shell, and the inner longitudinal end of the longitudinal elastic baffle (the end closest to the folded air duct) is connected to the outer wall of the folded air duct. In other words, the extension and retraction of the longitudinal elastic baffles are synchronized with the expansion and contraction of the folded air duct. Two vertical elastic baffles are installed on both sides of the folded air duct in the vertical direction. The two longitudinal ends of each vertical elastic baffle are movably connected to two diagonal supports on the same side, respectively. The top of each vertical elastic baffle is connected to the inner wall of the rectangular shell, and the bottom of each vertical elastic baffle is connected to the outer wall of the folded air duct. In other words, the extension and retraction of the vertical elastic baffles are also synchronized with the expansion and contraction of the folded air duct. The telescopic drive device extends or retracts the telescopic rod pusher, thereby causing the folded ventilation duct cavity to shrink and expand, and simultaneously causing the telescopic elastic baffle to retract and unfold. Preferably, telescopic elastic baffles are provided on both the front and rear inclined supports.

[0081] In this invention, an inlet baffle screen and an outlet baffle screen are respectively provided on the two windward sides of the rectangular shell (i.e., the two sides along the direction of the trolley's movement). The baffle screen has a porous screen structure, which can be used to block coarser sintered ore particles, but can ensure the smooth flow of air, thereby reducing the wear on the air outlet adjustment mechanism.

[0082] In this invention, the length of the extension or retraction of the telescopic push rod is controlled by controlling the start-up time of the telescopic drive device, thereby indirectly controlling the width or height of the rectangular air vent of the air vent adjustment mechanism, and finally achieving precise adjustment of the opening size of the rectangular air vent.

[0083] In this invention, the width of the annular cooler is 0.5~20m, preferably 1~15m, and more preferably 3~10m. The number of air vent adjustment mechanisms is 1~30, preferably 2~20, and more preferably 2~10. The height of the air vent adjustment mechanism is 0.1~5m, preferably 0.2~3m, and more preferably 0.3~2m.

[0084] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0085] 1. This utility model creatively proposes to set up a series air outlet adjustment mechanism at the air outlet between the medium-temperature exhaust gas circulation air box and the waste heat exhaust gas circulation air box in the high-temperature section. This allows for real-time adjustment of the air outlet opening based on changes in the actual circulation conditions of the medium-temperature exhaust gas and waste heat exhaust gas without altering the original air box structure or the fabric distribution mechanism. This ensures that the air volume distribution and fan operation in the duct are at their optimal operating conditions, thereby significantly improving the cooling and waste heat utilization efficiency of the air cooler.

[0086] 2: The air resistance regulation system for waste heat utilization of the annular cooler provided by this utility model has the advantages of simple overall structure, convenient control, low investment cost, easy operation, high control accuracy and good flexibility. In addition, it has excellent prospects for large-scale promotion and application. Attached Figure Description

[0087] Figure 1 This is a simplified diagram of the forward structure of the system described in this utility model.

[0088] Figure 2 This is a simplified side view of the system described in this utility model.

[0089] Figure 3 This is a simplified diagram of the rectangular shell with two chambers according to the present invention.

[0090] Figure 4 This is a front view of the rectangular shell with dual chambers of this utility model.

[0091] Figure 5 This is a side view of the rectangular shell with a double cavity structure of this utility model.

[0092] Figure 6 This is a simplified diagram of the rectangular shell with a single chamber according to the present invention.

[0093] Figure 7 This is a top view of the rectangular shell with a single chamber according to the present invention.

[0094] Figure 8 This is a side view of the rectangular shell with a single chamber according to the present invention.

[0095] Figure reference numerals: 1: Circulating cooler; 101: High-temperature section; 102: Medium-temperature section; 103: Low-temperature section; 104: First circulating fan; 105: Second circulating fan; 106: Normal-temperature fan; 107: Third circulating fan; 108: Exhaust pipe; 2: Waste heat utilization mechanism; 201: Economizer; 202: Waste heat boiler; 203: Gas transmission pipe; 3: Air outlet adjustment mechanism; 301: Rectangular shell; 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 blocking screen; 310: Platform; 311: Diagonal support; 312: Central shaft; 313: Folded ventilation duct; 314: Telescopic elastic baffle; L1: First duct; L2: Second duct; L3: Third duct; L4: Normal temperature air supply duct; Y1: First pressure gauge; Y2: Second pressure gauge; Y3: Third pressure gauge; Y4: Fourth pressure gauge. Detailed Implementation

[0096] The technical solution of this utility model is illustrated below. The scope of protection of this utility model includes, but is not limited to, the following embodiments.

[0097] A flow resistance regulation system for waste heat utilization in an annular cooler includes an annular cooler 1 and a waste heat utilization mechanism 2. Based on the material flow direction, the annular cooler 1 includes a high-temperature section 101, a medium-temperature section 102, and a low-temperature section 103. The bottom air box of the high-temperature section 101 is divided into a front air box and a rear air box, and a flow outlet regulation mechanism 3 is provided at the air outlet between the front and rear air boxes.

[0098] According to the airflow direction, the top hot exhaust gas outlet of the intermediate temperature section 102 is connected to the front air box of the high temperature section 101 through the first pipe L1. The top hot exhaust gas outlet 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 air box of the high temperature section 101 through the second pipe L2. A first circulating fan 104 is installed on the first pipe L1, and a second circulating fan 105 is installed on the second pipe L2.

[0099] Preferably, the bottom air 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 air box of the medium-temperature section 102 via a third pipe L3. A third circulating fan 107 is installed on the third pipe L3. Preferably, the top hot exhaust gas outlet of the medium-temperature section 102 is also connected to a vent pipe 109.

[0100] Preferably, the air vent adjustment mechanism 3 includes a rectangular housing 301, a telescopic drive device 302, a partition 303, and a foldable flexible partition 304. The partition 303 is horizontally positioned at the upper part of the inner cavity of the rectangular housing 301, dividing the inner cavity into an upper chamber and a lower chamber. The front and rear sidewalls of the lower chamber are open, forming air vents. The telescopic drive device 302 is located in the upper chamber. The foldable flexible partition 304 is located in the lower chamber and is parallel to the front and rear sidewalls of the lower chamber. In the width direction, one end of the foldable flexible partition 304 is fixedly connected to the sidewall of the lower chamber, and the other end is provided with a vertical support 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 rod 305 passes through the strip-shaped through hole and connects to the push rod of the telescopic drive device 302. The extension degree of the folding flexible partition 304 in the width direction is adjusted by controlling the movement distance of the vertical support rod 305 in the strip-shaped through hole through the telescopic drive device 302, thereby adjusting the opening degree of the air vent.

[0101] Preferably, a telescopic drive device 302 is provided on each side of the upper chamber in the width direction, and a pair of folding flexible partitions 304 are symmetrically arranged on both sides of the lower chamber in the width direction. The two telescopic drive devices 302 control the two folding flexible partitions 304 to move closer or further apart, thereby adjusting the opening of the air vent.

[0102] 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 folding flexible partition 304 is movably installed in the lower guide groove 306, and its upper end is movably installed in the upper guide groove 307.

[0103] Preferably, telescopic horizontal supports 308 are also provided at the upper and lower ends of the foldable flexible partition 304. Preferably, the telescopic horizontal supports 308 are sleeve-type telescopic rods.

[0104] Preferably, baffle screens 309 are provided at the air vents on the front and rear sides of the lower chamber.

[0105] Preferably, the air vent adjustment mechanism 3 includes a rectangular housing 301, a telescopic drive device 302, a platform 310, inclined supports 311, a central shaft 312, a folded air duct 313, and a telescopic elastic baffle 314. The rectangular housing 301 has a through-cavity. The central shaft 312 is vertically positioned at the center of the inner cavity of the rectangular housing 301. Eight inclined supports 311 are respectively provided at the eight apex corners of the inner cavity of the rectangular housing 301, and the inner ends of the eight inclined supports 311 extend inward and connect to the middle of the central shaft 312. The folded ventilation duct 313 is disposed within the inner cavity of the rectangular housing 301. One end of the folded ventilation duct 313 has an opening edge movably connected to four diagonal supports 311 located on the front side of the rectangular housing 301, and the other end has an opening edge movably connected to four diagonal supports 311 located on the rear side of the rectangular housing 301, thus forming a rectangular ventilation cavity extending along the front and rear sides of the rectangular housing 301. Four telescopic drive devices 302 are disposed at the midpoint of the four corners of the inner cavity of the rectangular housing 301 via a platform 310. The push rods of the telescopic drive devices 302 extend towards the center of the inner cavity of the rectangular housing 301 and connect to the wall of the folded ventilation duct 313. The reciprocating motion of the push rods of the telescopic drive devices 302 drives both ends of the folded ventilation duct 313 to slide synchronously on the eight diagonal supports 311, thereby controlling the opening degree of the rectangular ventilation cavity of the folded ventilation duct 313. The telescopic elastic baffle 314 has a U-shaped structure. The outer edge of the telescopic elastic baffle 314 is fixedly connected to the four inner side walls of the rectangular shell 301, and the inner edge of the telescopic elastic baffle 314 is fixedly connected to the four outer side walls of the folded ventilation duct 313. The surface of the telescopic elastic baffle 314 is movably connected to the four diagonal 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 folded ventilation duct 313 expands or contracts.

[0106] Preferably, a baffle screen 309 is provided at both the front and rear openings of the inner cavity through which the rectangular shell 301 passes.

[0107] Preferably, the telescopic elastic baffle 314 is a U-shaped structure formed by sequentially splicing together two elastic blades folded along the width direction and two elastic blades folded along the vertical direction.

[0108] 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 top hot waste gas outlet of the high-temperature section 101. The waste heat boiler 202 is located below the annular cooler, and its inlet is connected to the outlet of the economizer 201 via a gas transmission pipe 203. The inlet of the waste heat boiler 202 is also connected to a second pipe L2.

[0109] Preferably, a first pressure gauge Y1 is installed on the first pipe L1 located upstream of the first circulating fan 104, and a second pressure gauge Y2 is installed on the first pipe L1 located downstream of the first circulating fan 104.

[0110] Preferably, a third pressure gauge Y3 is installed on the second pipe L2 located upstream of the second circulating fan 105, and a fourth pressure gauge Y4 is installed on the second pipe L2 located downstream of the second circulating fan 105.

[0111] Preferably, a normal temperature make-up air duct L4 is also connected at the air inlet of the third circulating fan 107 or on the third duct L3 located upstream of the third circulating fan 107.

[0112] Preferably, material surface velocity meters are independently installed above the material layers in the high-temperature section 101, the medium-temperature section 102, and the low-temperature section 103. A fluid velocity meter is also installed in the air outlet regulating mechanism 3.

[0113] Example 1

[0114] like Figure 1-8 As shown, a flow resistance regulation system for utilizing waste heat from an annular cooler is disclosed. This system includes an annular cooler 1 and a waste heat utilization mechanism 2. Based on the material flow direction, the annular cooler 1 includes a high-temperature section 101, a medium-temperature section 102, and a low-temperature section 103. The bottom air box of the high-temperature section 101 is divided into a front air box and a rear air box, and a flow outlet regulation mechanism 3 is provided at the flow outlets between the front and rear air boxes.

[0115] According to the airflow direction, the top hot exhaust gas outlet of the intermediate temperature section 102 is connected to the front air box of the high temperature section 101 through the first pipe L1. The top hot exhaust gas outlet 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 air box of the high temperature section 101 through the second pipe L2. A first circulating fan 104 is installed on the first pipe L1, and a second circulating fan 105 is installed on the second pipe L2.

[0116] Example 2

[0117] The same method is used as in Example 1, except that a normal temperature fan 106 is connected to the bottom air box of the low temperature section 103. The top hot exhaust gas outlet of the low temperature section 103 is connected to the bottom air box of the medium temperature section 102 through a third pipe L3. A third circulating fan 107 is installed on the third pipe L3.

[0118] Example 3

[0119] Example 2 is repeated, except that the top hot exhaust gas outlet of the intermediate temperature section 102 is also connected to a vent pipe 108.

[0120] Example 4

[0121] Repeat Example 3, as follows Figure 4-6 As shown, the air vent adjustment mechanism 3 includes a rectangular housing 301, a telescopic drive device 302, a partition 303, and a foldable flexible partition 304. The partition 303 is horizontally positioned at the upper part of the inner cavity of the rectangular housing 301, dividing the inner cavity into an upper chamber and a lower chamber. The front and rear side walls of the lower chamber are open, forming air vents. The telescopic drive device 302 is located in the upper chamber. The foldable flexible partition 304 is located 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 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 rod 305 passes through the strip-shaped through hole and connects to the push rod of the telescopic drive device 302. The extension degree of the folding flexible partition 304 in the width direction is adjusted by controlling the movement distance of the vertical support rod 305 in the strip-shaped through hole through the telescopic drive device 302, thereby adjusting the opening degree of the air vent.

[0122] Example 5

[0123] The embodiment 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 folding flexible partitions 304 are symmetrically arranged on both sides of the lower chamber in the width direction. The two telescopic drive devices 302 control the two folding flexible partitions 304 to move closer or further apart, thereby adjusting the opening of the air vent.

[0124] Example 6

[0125] The embodiment 5 is repeated, except that 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 installed in the lower guide groove 306, and its upper end is movably installed in the upper guide groove 307.

[0126] Example 7

[0127] The embodiment 6 is repeated, except that telescopic horizontal supports 308 are also provided at the upper and lower ends of the foldable flexible partition 304.

[0128] Example 8

[0129] Repeat Example 7, except that the telescopic horizontal support 308 is a telescopic rod with a connecting sleeve.

[0130] Example 9

[0131] The embodiment 8 is repeated, except that a baffle screen 309 is provided at both the air vent on the front side wall of the lower chamber and the air vent on the rear side wall of the lower chamber.

[0132] Example 10

[0133] Repeat Example 1, as follows Figure 7-8 As shown, the air vent adjustment mechanism 3 includes a rectangular housing 301, a telescopic drive device 302, a platform 310, inclined supports 311, a central shaft 312, a folded air duct 313, and a telescopic elastic baffle 314. The rectangular housing 301 has a through-cavity. The central shaft 312 is vertically positioned at the center of the inner cavity of the rectangular housing 301. Eight inclined supports 311 are respectively provided at the eight apex corners of the inner cavity of the rectangular housing 301, and the inner ends of the eight inclined supports 311 extend inward and connect to the middle of the central shaft 312. The folded ventilation duct 313 is disposed within the inner cavity of the rectangular housing 301. One end of the folded ventilation duct 313 has an opening edge movably connected to four diagonal supports 311 located on the front side of the rectangular housing 301, and the other end has an opening edge movably connected to four diagonal supports 311 located on the rear side of the rectangular housing 301, thus forming a rectangular ventilation cavity extending along the front and rear sides of the rectangular housing 301. Four telescopic drive devices 302 are disposed at the midpoint of the four corners of the inner cavity of the rectangular housing 301 via a platform 310. The push rods of the telescopic drive devices 302 extend towards the center of the inner cavity of the rectangular housing 301 and connect to the wall of the folded ventilation duct 313. The reciprocating motion of the push rods of the telescopic drive devices 302 drives both ends of the folded ventilation duct 313 to slide synchronously on the eight diagonal supports 311, thereby controlling the opening degree of the rectangular ventilation cavity of the folded ventilation duct 313. The telescopic elastic baffle 314 has a U-shaped structure. The outer edge of the telescopic elastic baffle 314 is fixedly connected to the four inner side walls of the rectangular shell 301, and the inner edge of the telescopic elastic baffle 314 is fixedly connected to the four outer side walls of the folded ventilation duct 313. The surface of the telescopic elastic baffle 314 is movably connected to the four diagonal supports 311 on the front and rear sides of the rectangular shell 301. That is, the telescopic elastic baffle 314 shrinks or expands as the folded ventilation duct 313 expands or shrinks.

[0134] Example 11

[0135] The embodiment 10 is repeated, except that a baffle screen 309 is provided at both the front and rear openings of the inner cavity through which the rectangular shell 301 passes.

[0136] Example 12

[0137] The embodiment 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.

[0138] Example 13

[0139] Repeat Example 9, as follows Figure 1 The diagram shows the waste heat utilization mechanism 2, which 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 top hot waste gas outlet 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 an air supply pipe 203, and the air inlet of the waste heat boiler 202 is connected to the second pipe L2.

[0140] Example 14

[0141] Example 13 is repeated, except that a first pressure gauge Y1 is installed on the first pipe L1 located upstream of the first circulating fan 104, and a second pressure gauge Y2 is installed on the first pipe L1 located downstream of the first circulating fan 104.

[0142] Example 15

[0143] Example 14 is repeated, except that a third pressure gauge Y3 is installed on the second pipe L2 located upstream of the second circulating fan 105, and a fourth pressure gauge Y4 is installed on the second pipe L2 located downstream of the second circulating fan 105.

[0144] Example 16

[0145] Repeat Example 15, except that a normal temperature make-up air pipe L4 is also connected to the air inlet of the third circulating fan 107.

[0146] Example 17

[0147] Example 16 is repeated, except that a material surface wind speed detector (not shown in the figure) is 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 in the figure) is also installed in the air outlet regulating mechanism 3.

[0148] The general process of using this utility model is as follows: Hot sintered ore is loaded into the trolley of the annular cooler 1 and sequentially cooled through a stepped heat exchange section 101, a medium-temperature section 102, and a low-temperature section 103 to obtain cold material. During the heat exchange and cooling process: ambient temperature gas is used as the cooling air for the low-temperature section 103. The low-temperature hot waste gas discharged from the low-temperature section 103 is circulated by the third circulating fan 108 as the cooling air for the medium-temperature section 102. The medium-temperature hot waste gas discharged from the medium-temperature section 102 is circulated by the first circulating fan 104 as the cooling air for the high-temperature section 103. The high-temperature hot waste 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 waste gas, which is then circulated by the second circulating fan 105 as the cooling air for the high-temperature section 101 and the medium-temperature section 102.

[0149] During system operation, the adjustment process for the air vent opening is as follows: the telescopic drive device 302 controls the movement distance of the vertical support rod 305 in the strip-shaped through hole to adjust the unfolding degree of the folding flexible partition 304 in the width direction, thereby adjusting the air vent opening. Alternatively, the telescopic drive device 302 drives the two ends of the folding air duct 313 to slide synchronously on the eight inclined supports 311 through the reciprocating motion of the push rod, thereby controlling the opening of the rectangular air duct cavity of the folding air duct 313.

Claims

1. A system for adjusting the resistance of the air flow in a circular cooler for waste heat utilization, characterized in that: The air resistance regulation system includes an annular cooler (1) and a waste heat utilization mechanism (2); according to the direction of the material, the annular cooler (1) includes a high temperature section (101), a medium temperature section (102) and a low temperature section (103); the bottom air box of the high temperature section (101) is divided into a front air box and a rear air box, and an air outlet regulation mechanism (3) is provided at the air outlet of the front air box and the rear air box. According to the direction of airflow, the top hot exhaust gas outlet 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 top hot exhaust gas outlet 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 circulating fan (104) is installed on the first pipe (L1), and a second circulating fan (105) is installed on the second pipe (L2).

2. The air resistance regulation system according to claim 1, characterized in that: The bottom air 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 air box of the medium temperature section (102) through a third pipe (L3); a third circulating fan (107) is installed on the third pipe (L3).

3. The airflow resistance adjustment system according to claim 2, characterized in that: The top hot exhaust gas outlet of the medium temperature section (102) is also connected to a vent pipe (108).

4. The airflow resistance regulation system according to claim 1 or 2, characterized in that: The air vent adjustment mechanism (3) includes a rectangular shell (301), a telescopic drive device (302), a partition (303), and a folding flexible partition (304); the partition (303) is horizontally arranged in 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 open to form an air vent; the telescopic drive device (302) is arranged in the upper chamber; the folding 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 folding flexible partition (304) is fixedly connected to the side wall of the lower chamber, and the other end is provided with a vertical support 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 rod (305) passes through the strip-shaped through hole and is connected to the push rod of the telescopic drive device (302); the telescopic drive device (302) controls the movement distance of the vertical support rod (305) in the strip-shaped through hole to adjust the unfolding degree of the folding flexible partition (304) in the width direction, thereby adjusting the opening degree of the air vent.

5. The airflow resistance adjustment system according to claim 4, characterized in that: A telescopic drive device (302) is provided on each side of the upper chamber in the width direction, and a pair of folding flexible partitions (304) are symmetrically provided on both sides of the lower chamber in the width direction. The two telescopic drive devices (302) control the two folding flexible partitions (304) to move closer or further away from each other, thereby adjusting the opening of the air vent.

6. The airflow resistance adjustment system according to claim 4, characterized in that: 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 installed in the lower guide groove (306), and its upper end is movably installed in the upper guide groove (307).

7. The air resistance regulation system according to claim 6, characterized in that: Telescopic horizontal supports (308) are also provided at the upper and lower ends of the folding flexible partition (304).

8. The air resistance regulation system according to claim 7, characterized in that: The telescopic horizontal support (308) is a sleeve-type telescopic rod.

9. The air resistance regulation system according to claim 7, characterized in that: Material-blocking screens (309) are installed at the air vents on the front and rear sides of the lower chamber.

10. The airflow resistance regulation system according to claim 1 or 2, characterized in that: The air vent adjustment mechanism (3) includes a rectangular shell (301), a telescopic drive device (302), a platform (310), diagonal supports (311), a central shaft (312), a folded air duct (313), and a telescopic elastic baffle (314); the rectangular shell (301) has a through-cavity; the central shaft (312) is vertically positioned at the center of the inner cavity of the rectangular shell (301); eight diagonal supports (311) are respectively provided at the eight apex corners of the inner cavity of the rectangular shell (301), and the eight diagonal supports (311) are... The inner ends of the supports (311) extend inward and connect to the middle of the central axis (312); the folded ventilation duct (313) is set in the inner cavity of the rectangular shell (301), and the opening edge of one end of the folded ventilation duct (313) is movably connected to the four oblique supports (311) located on the front side of the rectangular shell (301), and the opening edge of the other end is movably connected to the four oblique supports (311) located on the rear side of the rectangular shell (301), thereby forming a rectangular ventilation duct cavity that runs through the front and rear sides of the rectangular shell (301); in the rectangular shell Four telescopic drive devices (302) are installed at the center of the four corners of the inner cavity of the body (301) via a platform (310). 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 pipe wall of the folded ventilation duct (313). The telescopic drive devices (302) drive the two ends of the folded ventilation duct (313) to slide synchronously on the eight inclined supports (311) through the reciprocating motion of the push rods, thereby controlling the opening of the rectangular ventilation duct cavity of the folded ventilation duct (313). The telescopic elastic baffle (314) is a U-shaped structure. The outer edge of the telescopic elastic baffle (314) is fixedly connected to the four inner walls of the rectangular shell (301). The inner edge of the telescopic elastic baffle (314) is fixedly connected to the four outer walls of the folded ventilation duct (313). The plate surface of the telescopic elastic baffle (314) is movably connected to the four diagonal supports (311) on the front and / or rear sides of the rectangular shell (301). That is, the telescopic elastic baffle (314) shrinks or expands as the folded ventilation duct (313) expands or shrinks.

11. The airflow resistance regulation system according to claim 10, characterized in that: Material-blocking screens (309) are provided at the front and rear openings of the inner cavity through the rectangular shell (301).

12. The airflow resistance regulation system according to claim 10, characterized in 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.

13. The airflow resistance regulating system according to any one of claims 1-3, 5-9, and 11-12, characterized in that: 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 top hot waste gas outlet 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) through the gas transmission pipe (203), and the air inlet of the waste heat boiler (202) is connected to the second pipe (L2).

14. The airflow resistance regulating system according to any one of claims 1-3, 5-9, and 11-12, characterized in that: A first pressure gauge (Y1) is installed on a first pipe (L1) upstream of the first circulating fan (104), and a second pressure gauge (Y2) is installed on a first pipe (L1) downstream of the first circulating fan (104); and / or A third pressure gauge (Y3) is installed on the second pipe (L2) located upstream of the second circulating fan (105), and a fourth pressure gauge (Y4) is installed on the second pipe (L2) located downstream of the second circulating fan (105).

15. The airflow resistance regulating system according to any one of claims 1-3, 5-9, and 11-12, characterized in that: A normal temperature make-up air pipe (L4) is also connected at the air inlet of the third circulating fan (107) or on the third pipe (L3) located upstream of the third circulating fan (107).

16. The airflow resistance regulation system according to claim 15, characterized in that: Material surface wind speed detectors are independently installed above the material layer in the high temperature section (101), medium temperature section (102) and low temperature section (103); fluid wind speed detectors are also installed in the air outlet regulating mechanism (3).

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