Control system for reducing energy consumption of blast furnace dust removal system

Abstract

The utility model discloses a control system applied to reducing the energy consumption of a blast furnace dust removal system, an induced draft fan comprises a fan shell, one side of the fan shell is fixedly connected with a motor, the other side of the fan shell is provided with a filter assembly, and the bottom of the fan shell is fixedly connected with a mounting plate through bolts. The technical problems that fan blades of an induced draft fan can be damaged when the induced draft fan is used for a long time, meanwhile, the induced draft fan can generate large vibration in the working process, and the overall work can be affected by long-time vibration are solved, large-particle impurities sucked in the working process are blocked through an arranged filtering assembly, and the working efficiency of the induced draft fan is improved. The large-particle impurities are prevented from being sucked in a large amount to damage fan blades in the induced draft fan, vibration generated in the working process can be reduced through cooperation of the damping springs, the working stability of the induced draft fan is improved, meanwhile, the large-particle impurities can be collected through the arranged collecting box, and follow-up centralized treatment is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace dust removal, in particular to a control system used for reducing the energy consumption of a blast furnace dust removal system. Background Art

[0002] The measures taken by the thermal power industry to reduce dust emissions are generally to increase the output of existing dust removal equipment or to add new dust removal equipment. For example, the current ultra-low emission transformation of the thermal power industry is to add wet dust collectors and other equipment to reduce dust emissions.

[0003] According to the patent application number CN201810201228.5, the patented system includes a temperature sensor, a differential pressure sensor, an oxygen concentration sensor and a PLC controller. The temperature sensor is installed inside the inlet air duct and connected to the signal of the PLC controller input end. The differential pressure sensor is installed on the top of the bag collector and connected to the signal of the PLC controller input end. The oxygen concentration sensor is installed inside the steelmaking converter and connected to the signal of the PLC controller input end. The output port of the PLC controller is respectively connected to the offline valve, bypass valve, injection pulse valve, dust removal fan of the bag collector and the dust removal valve installed at the flue gas outlet of the steelmaking converter.

[0004] When some existing energy consumption control systems of dust removal systems control and adjust energy consumption, most of the induced draft fans equipped with dust collectors in front of blast furnaces are operated at industrial frequency. Therefore, when the blast furnace is not producing iron, the induced draft fans still maintain full load operation, which will not only reduce the service life of the induced draft fans, but also increase the overall power consumption of the dust removal system and increase the system operating costs. If the existing industrial frequency induced draft fans are replaced with variable frequency fans, the operation will still be manual. Due to the untimely judgment of the blast furnace's iron production, there will be a lag in the fan frequency increase and decrease operation, which will not only cause energy waste, but also seriously lead to poor on-site environmental performance, thus affecting blast furnace production. If a control system is added to collect the blast furnace's iron production as a signal control, the signal collected by this method is unstable, and the fan frequency increase and decrease cannot be adjusted in time.

[0005] Secondly, when the induced draft fan is in use, the existing residue will be sucked into the fan, and long-term use will cause damage to the fan blades. At the same time, the induced draft fan will produce greater vibrations during operation, and long-term vibrations will affect the overall operation. Utility Model Content

[0006] The purpose of the utility model is to provide a control system for reducing the energy consumption of a blast furnace dust removal system and solve the following technical problems:

[0007] Long-term use will cause damage to the induced draft fan blades. At the same time, the induced draft fan will produce greater vibrations during operation, and long-term vibrations will affect the overall operation.

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art:

[0009] A control system for reducing the energy consumption of a blast furnace dust removal system, comprising a granulating tower flushing water pump, a frequency converter, an induced draft fan, a bag dust collector, a dust hood and a blast furnace tapping port, wherein the induced draft fan comprises a fan housing, one side of the fan housing is fixedly connected to a motor, the other side of the fan housing is provided with a filter assembly, the bottom of the fan housing is fixedly connected to a mounting plate by bolts, and the bottom of the mounting plate is slidably connected to a base.

[0010] As a further solution of the utility model: the filter assembly includes a protective shell, the inner cavity of the protective shell is fixedly connected to a stabilizing ring, one side of the stabilizing ring is fixedly connected to multiple springs, and the same side of the multiple springs is fixedly connected to a filter screen, and the filter screen is slidably connected to the inner cavity of the stabilizing ring, both sides of the bottom of the protective shell are fixedly connected to limiting baffles, the inner bottom of the protective shell is provided with a collecting port, the bottom of the protective shell is movably connected to a collecting box, and both sides of the collecting box are provided with limiting grooves, and the limiting cross bars are inserted inside the limiting grooves.

[0011] As a further solution of the utility model: the mounting plate includes a plate body, both sides of the bottom of the plate body are fixedly connected to limit sliders, and the plate body is fixedly connected to the fan casing by bolts.

[0012] As a further solution of the utility model: the base includes a base shell, the inner cavity of the base shell is provided with a plurality of shock-absorbing springs, the top of the base shell is movably connected with a movable plate, limiting slide grooves are provided on both sides of the top of the movable plate, and the limiting slider is slidably connected to the limiting slide groove, and the sizes of the limiting slider and the limiting slide groove match each other.

[0013] Beneficial effects of the utility model:

[0014] The filter assembly is set up to block the large particles of impurities sucked in during the working process, avoiding the damage to the fan blades inside the induced draft fan caused by the large amount of large particles of impurities sucked in. Secondly, the base is set up and the use of shock-absorbing springs can reduce the vibration generated during the working process and improve the stability of the induced draft fan. At the same time, the collection box is set up to collect large particles of impurities, which is convenient for subsequent centralized processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the control system of the utility model

[0017] Figure 2This is a schematic diagram of the structure of the utility model induced draft fan;

[0018] Figure 3 It is a schematic diagram of the structure of the utility model filter assembly;

[0019] Figure 4 This is a schematic diagram of the tilt angle structure of the utility model filter assembly;

[0020] Figure 5 This is a schematic diagram of the disassembly structure of the utility model base;

[0021] Figure 6 This is the schematic diagram of the control system.

[0022] In the figure: 1. Fan casing; 2. Motor; 3. Filter assembly; 31. Protective casing; 32. Stabilizing ring; 33. Spring 1; 34. Filter screen; 35. Limit baffle; 36. Collecting box; 37. Limiting cross bar; 38. Collecting port; 5. Mounting plate; 51. Plate body; 52. Limiting slider; 6. Base; 61. Base casing; 62. Movable plate; 63. Limiting slide; 64. Shock-absorbing spring; A. Control system; B. Granulating tower flushing water pump; C. Signal processing system; D. Frequency converter; E. Draft fan; F. Bag dust collector; G. Dust hood; H. Blast furnace tapping port. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] For example, see Figure 1 and Figure 2 As shown, the utility model is a control system for reducing the energy consumption of a blast furnace dust removal system, comprising a granulating tower flushing water pump B, a frequency converter D, an induced draft fan E, a bag dust collector F, a dust hood G and a blast furnace tapping port H, wherein the induced draft fan comprises a fan casing 1, a motor 2 is fixedly connected to one side of the fan casing 1, and the output end of the motor 2 is used to drive the rotation of the fan blades inside the fan casing 1, thereby performing dust collection and discharge work.

[0025] Example 2, please participate Figure 3 and Figure 4, and this embodiment includes all the structures in embodiment one, a filter assembly 3 is provided on the other side of the fan housing 1, the filter assembly 3 includes a protective housing 31, the inner cavity of the protective housing 31 is fixedly connected with a stabilizing ring 32, and the stabilizing ring 32 is located inside the protective housing 31 in an annular shape, one side of the stabilizing ring 32 is fixedly connected with a plurality of springs 1 33, and the same side of the plurality of springs 1 33 is fixedly connected with a filter screen 34, and the filter screen 34 is slidably connected to the inside of the protective housing 31, and secondly, when working, the fan housing 1 will inhale dust, so that the inhaled wind will drive the movement of the filter screen 34, but under the action of the spring 1 33, a reverse force will be applied to the filter screen 34, so that the filter screen 34 will reciprocate inside the protective housing 31, and further, the impurities attached to the surface of the filter screen 34 will be shaken off and then dropped into the collection box 36 for collection.

[0026] The filter screen plate 34 is slidably connected to the inner cavity of the stabilizing ring 32, and the two sides of the bottom of the protective shell 31 are fixedly connected to the limiting baffles 35, wherein the middle part of the limiting baffle 35 is hollow, and the inside of the limiting baffle 35 is also slidably connected to the limiting cross piece 37, and the function of the limiting cross piece 37 is to connect and limit the collection box 36 with the protective shell 31. Limiting grooves are provided on both sides of the collection box 36, and the grooves are used to connect with the limiting cross piece 37 to achieve the purpose of installation. A collection port 38 is provided at the bottom inner side of the protective shell 31, and the collection box 36 is movably connected to the bottom of the protective shell 31. The limiting cross piece 37 inserted inside the limiting groove blocks large particles during the dust collection process by using the filter assembly 3, thereby preventing large particles from entering the inside of the fan shell 1 and causing damage to the fan blades inside the fan shell 1.

[0027] Example 3, please participate Figure 4 and Figure 5 This embodiment includes all the structures of the second embodiment.

[0028] Secondly, the bottom of the fan casing 1 is fixedly connected with a mounting plate 5 by bolts, and the mounting plate 5 includes a plate body 51, and both sides of the bottom of the plate body 51 are fixedly connected with limit sliders 52, and the limit sliders 52 are connected to the limit slide grooves 63 by sliding and matching with each other. When the mounting plate 5 is installed as a whole, the limit slide grooves 63 and the limit sliders 52 are used to cooperate with each other to slide to achieve the connection and installation of the two, and the plate body 51 is fixedly connected to the fan casing 1 by bolts.

[0029] The bottom of the mounting plate 5 is slidably connected to a base 6, which includes a base shell 61. The inner cavity of the base shell 61 is provided with a plurality of shock-absorbing springs 64. The top of the base shell 61 is movably connected to a movable plate 62. Limiting grooves 63 are provided on both sides of the top of the movable plate 62. The function of the shock-absorbing springs 64 is to reduce the vibration generated during the working process, thereby ensuring the overall stability.

[0030] The present application provides a control system for reducing the energy consumption of a blast furnace dust removal system, comprising: a general control system end, a start signal processing end, a stop signal processing end, an adjustment monitoring and analysis end and an information output end. Specifically, when the blast furnace starts to tap iron, the granulation tower flushing water pump starts to start, and at the same time, the start signal is transmitted to the start signal processing end. The start signal processing end receives the start signal and controls the frequency converter to increase the frequency converter frequency, and the frequency converter controls the induced draft fan to increase the speed of the induced draft fan. When the blast furnace stops tapping iron, the granulation tower flushing water pump stops running, and at the same time, the stop signal is transmitted to the start and stop processing end. The stop signal processing end receives the stop signal and controls the frequency converter to reduce the frequency converter frequency, and the frequency converter controls the induced draft fan to reduce the speed of the induced draft fan.

[0031] The overall control system end, wherein the overall control system mainly includes the granulating tower flushing water pump, the signal processing system, the frequency converter, and the induced draft fan. Meanwhile, the signal processing system includes: a start signal processing end and a stop signal processing end. The overall control system end transmits the generated start signal to the start signal processing end, and transmits the generated stop signal to the stop signal processing end.

[0032] The start signal processing end obtains the transmitted start signal and adjusts the induced draft fan appropriately by analyzing the frequency of the induced draft fan. The frequency analysis method is as follows:

[0033] The relationship between the speed of the induced draft fan and the suction force of the induced draft fan is analyzed by combining big data, and the suction force of the induced draft fan is determined by calculating the volume of the remaining dust. For example, when the induced draft fan is not started, the corresponding dust volume is Y, and when the induced draft fan is operated at a speed of V, the remaining dust volume is 0.2Y-0.23Y of the total volume. Therefore, the suction force of the induced draft fan corresponding to the speed of the induced draft fan V is in the interval of 0.2Y-0.23Y. The suction force of the induced draft fan corresponding to different speeds V is obtained by analogy.

[0034] Then, the induced draft fan speed and the induced draft fan suction are labeled, and the induced draft fan speed is denoted as Di, and i=1, 2, ..., j, wherein i represents the gear corresponding to the induced draft fan speed, and the specific value of i is determined according to the actual gear of the induced draft fan. For example, if the induced draft fan has five gears, the corresponding value of i is 5. The induced draft fan suction is denoted as Xn, and n=A, B, C, D. Specifically, A, B, C and D are all range values, which are expressed as the range value of the suction.

[0035] Then obtain the current speed of the induced draft fan and record it as Rs, and select the speed gear corresponding to the current speed higher than the induced draft fan Rs and record it as the gear to be adjusted Da, where a represents the number of corresponding gears after screening. For example, the current speed gear of the induced draft fan is 3 gears, and the induced draft fan has 6 gears as a whole. Therefore, the selected gears are 4, 5 and 6, and a=4, 5 or 6 is recorded as the gear to be adjusted.

[0036] Secondly, the power consumption corresponding to the gear position Da to be adjusted is obtained and recorded as Ga, and the power consumption corresponding to the gear position to be adjusted is expressed as the relationship between the total power consumption output per unit time and the actual power consumption, and the specific calculation method is as follows:

[0037] Obtain the speed Ra and torque Ta corresponding to the induced draft fan. The torque can be directly obtained through the parameters on the nameplate of the induced draft fan. The speed can also be directly obtained, and the obtained parameters are substituted into the formula The power Pa corresponding to the induced draft fan is calculated, and the voltage Ua and current Ia corresponding to the induced draft fan are obtained at the same time. The rated power P1 is calculated according to the power calculation formula. Then Pa and P1 are substituted into the formula Pc=|P1-Pa| to calculate the power consumption Pc corresponding to the gear position Da to be adjusted of the induced draft fan;

[0038] Then, the power consumption Pc corresponding to the gear positions to be adjusted of the induced draft fan are sorted from small to large, and the gear position to be adjusted of the induced draft fan corresponding to the minimum power consumption Pc is selected, and the speed increase adjustment information is generated and transmitted to the information output terminal.

[0039] The information output terminal is used to obtain the transmitted speed increase adjustment information and control the frequency converter according to the speed increase adjustment information, thereby controlling the induced draft fan through the frequency converter to perform corresponding speed increase adjustment.

[0040] The overall control system end transmits the generated stop signal to the stop signal processing end, and analyzes it through the stop signal processing end.

[0041] The stop signal processing end is used to obtain the transmitted stop signal, analyze the frequency of the induced draft fan, and make appropriate adjustments based on the suction force of the induced draft fan. The specific analysis and adjustment methods are as follows:

[0042] The speed gear D1 corresponding to the induced draft fan is obtained, and the dust emission per unit time when the granulating tower flushing water pump stops working is obtained. The specific dust emission indicates that when the blast furnace stops tapping iron, some broken slag will be generated, and these broken slag will fall from the outlet. At the same time, due to the stoppage of the granulating tower flushing water pump, there is not as much miscellaneous material as when the granulating tower flushing water pump and the blast furnace work at the same time, but some miscellaneous materials will still be generated. Therefore, the induced draft fan is still needed to absorb the generated miscellaneous materials. Then, the speed gear D1 of the induced draft fan is reduced and adjusted to obtain the suction force corresponding to the current speed gear D1. At the same time, the minimum residual amount is obtained, and the gear of the induced draft fan is selected based on the minimum residual amount. Then, the selected gear is recorded as the preferred gear Db; specifically, the preferred gear selected here is all gears between the current induced draft fan speed gear D1 and the gear corresponding to the minimum residual amount interval. For example, the current induced draft fan speed gear is gear 3, and the gear corresponding to the minimum residual amount interval is gear 1, so the preferred gear has two gears, 1 and 2.

[0043] Similarly, the power consumption corresponding to the preferred gear position Db is calculated, and the gear position corresponding to the minimum power consumption is selected as the reduced gear position, and the reduction adjustment information is generated and transmitted to the information output terminal.

[0044] The information output terminal is used to obtain the transmitted speed reduction adjustment information and to control the frequency converter to perform corresponding speed reduction adjustment on the induced draft fan.

[0045] The start signal processing end and the stop signal processing end will generate the speed-up adjustment information and the speed-down adjustment information and transmit them to the adjustment monitoring and analysis end, which will perform real-time monitoring and analysis on the two. The specific method of real-time monitoring of the speed-up adjustment information is as follows:

[0046] The corresponding supercharger speed gear after the speed increase adjustment is obtained and recorded as the real-time speed gear. At the same time, the remaining amount corresponding to the real-time speed gear is obtained and the remaining amount is judged. If the remaining amount meets the working requirements, it means that the real-time speed gear does not need to be adjusted. If the remaining amount does not meet the working requirements, it means that the real-time speed gear needs to be adjusted, and the working requirements are expressed as the minimum remaining amount under the premise of ensuring environmental performance;

[0047] When the real-time speed gear needs to be adjusted, the real-time speed gear is adjusted up by one gear, and real-time monitoring information is generated and transmitted to the information output terminal.

[0048] The specific method of real-time monitoring of the speed reduction adjustment information is similar to the real-time monitoring process of the speed increase adjustment information, and the real-time monitoring information is generated and transmitted to the information output terminal.

[0049] Specifically, when the current remaining amount is judged according to the speed reduction adjustment information, if the remaining amount is higher than the minimum remaining amount, it means that the gear needs to be increased, and if the remaining amount is lower than the minimum remaining amount, it means that the gear does not need to be changed.

[0050] The working principle of the utility model is as follows: first, the collection box 36 is installed at the bottom of the protective shell 31. During the installation, the collection box 36 is limitedly installed by the cooperation of two limit baffles 35 and a limit cross piece 37 fixedly connected to the bottom of the protective shell 31. After the installation is completed, the induced draft fan can be used for dust collection.

[0051] The rotation of the output end of the motor 2 drives the fan blades inside the fan housing 1 to rotate, thereby generating suction to adsorb dust through the through holes on one side of the fan housing 1. At the same time, in the process of adsorbing dust, large particles of dust will be blocked by the filter plate 34, and some of them will remain on the filter plate 34. When the motor 2 continues to work, a continuous suction force will be generated inside the fan housing 1, which will drive the movement of the filter plate 34 under the action of the suction force. Further, under the action of the spring 1 33, the filter plate 34 is moved, thereby vibrating the impurities on the filter plate 34, and the impurities that fall down will fall into the collection box 36 for centralized collection.

[0052] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A control system for reducing the energy consumption of a blast furnace dust removal system, comprising a granulating tower flushing water pump, a frequency converter, an induced draft fan, a bag dust collector, a dust hood and a blast furnace tapping hole, wherein one end of the induced draft fan is fixedly connected to the blast furnace tapping hole, the other end of the induced draft fan is fixedly connected to the bag dust collector, and one end of the blast furnace tapping hole is fixedly connected to the dust hood, characterized in that: The induced draft fan comprises a fan housing (1), one side of the fan housing (1) is fixedly connected to a motor (2), the other side of the fan housing (1) is provided with a filter assembly (3), the bottom of the fan housing (1) is fixedly connected to a mounting plate (5) by means of bolts, and the bottom of the mounting plate (5) is slidably connected to a base (6).

2. A control system for reducing energy consumption of a blast furnace dust removal system according to claim 1, characterized in that: The filter assembly (3) comprises a protective shell (31), the inner cavity of the protective shell (31) is fixedly connected to a stabilizing ring (32), one side of the stabilizing ring (32) is fixedly connected to a plurality of springs (33), and the same side of the plurality of springs (33) is fixedly connected to a filter screen (34), and the filter screen (34) is slidably connected to the inner cavity of the stabilizing ring (32).

3. A control system for reducing energy consumption of a blast furnace dust removal system according to claim 2, characterized in that: Both sides of the bottom of the protective shell (31) are fixedly connected to limit baffles (35), the inner bottom of the protective shell (31) is provided with a collection port (38), the bottom of the protective shell (31) is movably connected to a collection box (36), and both sides of the collection box (36) are provided with limit grooves, and the inside of the limit grooves is plugged with limit cross pieces (37).

4. A control system for reducing energy consumption of a blast furnace dust removal system according to claim 1, characterized in that: The mounting plate (5) comprises a plate body (51), both sides of the bottom of the plate body (51) are fixedly connected to limit sliders (52), and the plate body (51) is fixedly connected to the fan casing (1) by bolts.

5. A control system for reducing energy consumption of a blast furnace dust removal system according to claim 1, characterized in that: The base (6) comprises a base shell (61), the inner cavity of the base shell (61) is provided with a plurality of shock-absorbing springs (64), and the top of the base shell (61) is movably connected to a movable plate (62).

6. A control system for reducing energy consumption of a blast furnace dust removal system according to claim 5, characterized in that: Both sides of the top of the movable plate (62) are provided with limiting sliding grooves (63), and the limiting sliding block (52) is slidably connected to the limiting sliding groove (63), and the sizes of the limiting sliding block (52) and the limiting sliding groove (63) match each other.

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