Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
  • F27B21/06—Endless-strand sintering machines
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D19/00—Arrangements of controlling devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices

Definitions

• the present invention relates to energy saving technologies for sintering systems in the metallurgical field, and more particularly to a method and system for controlling main exhaust fans. Background technique
• a typical sintering system is shown in Fig. 1.
• the system mainly includes a plurality of equipments such as a sintering trolley, a mixer, a main exhaust fan, a ring cooler, and the like, wherein various iron-containing raw materials, fuels, and solvents are mixed in the batching chamber 1. , then enter the mixer 2 to mix and pelletize to form a mixture, and then uniformly distribute the mixture on the sintering trolley 5 through the round roller feeder 3 and the nine-roll distributor 4, and then the ignition fan 6 and the ignition fan 7 is the roasting process of the mixture starting material ignition.
• the sintered ore obtained after the sintering is completed is crushed by a single-roll crusher 8 and then cooled into a ring cooler.
• the inventors have found in the process of carrying out the invention that in order to accommodate various productions in the prior art, the main exhaust fan 10 always needs to provide sufficient or even excessive air volume. In other words, the main exhaust fan 10 needs to always work at all times.
• the actual demand for a higher power state or even the maximum power state which leads to a large amount of wind in practice, which is wasted as an ineffective wind that does not participate in sintering, thereby causing waste of electrical energy consumed by these ineffective winds.
• the main wind is exhausted. The machine makes a simple adjustment scheme, but obviously it does not have the effect of effectively saving energy. Summary of the invention
• an object of embodiments of the present invention is to provide a method and system for controlling a main exhaust fan, which solves the problem of energy waste of the main exhaust fan by precise control of the main exhaust fan.
• an embodiment of the present invention provides a method for controlling a main exhaust fan, the method comprising: 1) acquiring a required air volume of a sintering trolley bellows, and obtaining a required large flue air volume according to the required air volume of the windbox;
• the obtaining the required air volume of the sintering trolley bellows comprises:
• the method further comprises:
• step iii) the method further comprises:
• Iv) separately collect the running speed of the sintering trolley, the material thickness on the sintering trolley and the length of the sintering trolley;
• V obtaining the predetermined vertical sintering speed based on the collected running speed of the sintering trolley, the material thickness on the sintering trolley, and the length of the sintering trolley.
• step 2b specifically, the P tube is used to eliminate the S*Q flue 2 to obtain the negative pressure P tube required to be consumed on the pipeline, wherein the S tube is the corresponding pipeline resistance;
• the P wind n S n Q main pump 2 is used to obtain the negative pressure P ⁇ required to be consumed on the damper, wherein the S wind ⁇ is the damper resistance;
• N W W using the first air remaining in the flue gas is oxidized + N acquired amount of oxygen involved in the reaction involved in anti-disease 0, where 0 represents the amount of oxygen of air preset normal air, N g represents the amount of nitrogen gas preset normal air , 0 «The remaining in the gas indicates the amount of residual oxygen in the flue gas after the reaction, N flue gas ⁇ « ⁇ indicates the amount of nitrogen remaining in the flue gas after the reaction is obtained, and N is oxidized to indicate that the obtained flue gas is oxidized into The amount of nitrogen of NO and N0 2 ;
• the air volume Q box is valid, which is the preset vertical sintering speed, and the Q unit is the preset effective air volume required for sintering the unit material.
• step 4) comprises:
• an embodiment of the present invention further provides a main exhaust fan control system, the system comprising: a large flue total air volume acquiring unit, configured to acquire a required air volume of the sintering trolley bellows, and according to the bellows required Air volume to obtain the required large flue air volume;
• a large flue negative pressure acquiring unit for obtaining a material layer resistance corresponding to a required large flue air volume in a preset first database, and obtaining the required amount according to the material layer resistance and the required large flue air volume Large flue negative pressure;
• a pipeline negative pressure acquiring unit configured to acquire a pipeline resistance corresponding to a required large flue air volume in a preset second database, and obtain a required consumption according to the pipeline resistance and the required large flue air volume Negative pressure on the pipeline;
• a damper negative pressure acquiring unit configured to: obtain a wind leakage resistance corresponding to a required large flue air volume in a preset third database; according to the air leakage resistance, a required large flue negative pressure, and a required consumption in the pipeline The negative pressure on the upper part is obtained, and the required air leakage volume of the pipeline is obtained; according to the required large flue air volume and the required air leakage air volume of the pipeline, the total air volume of the main exhaust fan is obtained; and the required large flue is obtained in the preset fourth database.
• the damper resistance corresponding to the air volume is obtained according to the damper resistance and the total air volume of the main exhaust fan required, and the negative pressure required to be consumed on the damper is obtained;
• the total negative pressure obtaining unit is configured to obtain the total negative pressure of the required main exhaust fan according to the required large flue negative pressure, the required negative pressure on the pipeline, and the negative pressure required to be consumed on the damper;
• Main exhaust fan adjustment unit for adjusting the main exhaust fan according to the total negative pressure of the main exhaust fan required.
• the embodiment of the present invention can More precise and practical adjustment of the main exhaust fan to avoid waste of air volume.
• the embodiment of the present invention comprehensively analyzes various types of negative pressure, various air volumes, various types of resistance, and vertical speed of sintering, and firstly obtains a large flue air volume required for normal sintering. Then, by using a plurality of databases prepared during the test phase, the required main exhaust fan total negative is obtained by obtaining the required large flue negative pressure, the required negative pressure on the pipeline, and the negative pressure required to be consumed on the damper.
• Figure 1 is a schematic view of a typical sintering system
• FIG. 2 is a flow chart of a method according to an embodiment of the present invention.
• Figure 3 is a schematic view showing the installation position of the smoke component analyzer
• FIG. 5 is a schematic diagram of a third embodiment of the present invention. detailed description
• Embodiment 1 is a diagrammatic representation of Embodiment 1:
• the sintering speed of the sintering trolley is often adjusted during sintering at a certain yield, but the inventors found that this practice will directly cause the material flow of the sintering trolley to fluctuate, and the fluctuation of the material flow will be the process of each step. Control causes adverse effects, such as making the sintering itself or subsequent processes more complicated and difficult to control. Therefore, it is preferred that the present invention is based on the premise that the sintering trolley runs at a constant speed, that is, the material flow rate is stable.
• the material flow stability in the present invention does not conflict with the change in the output, because the material flow stability refers to the stable flow of the material at a certain fixed output, when the output is adjusted to another value, The thickness of the material layer will be different from that of the previous production, but the sintering speed of the sintering trolley can be maintained again and the material flow rate is stable.
• FIG. 2 it is a flowchart of a method according to an embodiment of the present invention.
• This embodiment provides a method for controlling a main air blower, and the method includes:
• S202b Obtain a pipeline resistance corresponding to a required large flue air volume in a preset second database, and obtain a negative pressure required to be consumed in the pipeline according to the pipeline resistance and the required large flue air volume; as well as,
• the total negative pressure of the main exhaust fan is taken as the target parameter, or it can be said that the total negative pressure generated by the main exhaust fan is controlled to satisfy the sintering station.
• the total negative pressure is required as the control standard.
• the main air blower passes through the material on the sintering trolley from top to bottom and then passes through the bellows under the trolley and finally gathers into the large flue and is eliminated by the main exhaust fan.
• Resistance one is the resistance of the sintering trolley, mainly the material on the trolley, the second is the resistance of each pipeline passing through the airflow, and the third is the resistance of the damper. Therefore, the total negative pressure of the main exhaust fan is also composed of three parts.
• Executions S202a to S202c can respectively acquire one of the three partial negative pressures, and the three of them add up to obtain the total negative pressure of the main exhaust fan.
• S202a is similar to S202b in that it first uses the database to obtain the layer/pipe resistance corresponding to the required large flue air volume, which in turn can obtain the required large flue negative pressure/necessary pressure on the pipeline. In addition, S202a has no correlation with S202b, so the order can also be reversed.
• S202c is a little more complicated: the ultimate goal of S202c is to obtain the negative pressure required to be consumed on the damper, which is the damper of the main exhaust fan. It is still possible to first use the database to obtain the damper resistance corresponding to the required large flue air volume, but when calculating the negative pressure required to be consumed on the damper, the large flue air volume can no longer be used, but the main exhaust fan should be used. Total air volume. Ideally, the total air volume of the main exhaust fan should be equal to the air volume of the large flue, but in reality, the air leakage will inevitably occur in each pipeline.
• the total air volume of the main exhaust fan the volume of the large flue air + the air leakage of the pipeline, so it is necessary to obtain the air leakage of the pipeline first.
• Air volume The air leakage resistance corresponding to the required large flue air volume can be obtained in the preset third database, and then according to the air leakage resistance, the required large flue negative pressure, and the required negative pressure on the pipeline, It is possible to obtain the required amount of air leakage from the pipeline, which in turn can ultimately achieve the required negative pressure on the damper.
• Q flue is the required large flue air volume, and S material is the corresponding material layer resistance;
• the P wind n S n Q main pump 2 is used to obtain the negative pressure P ⁇ required to be consumed on the damper, wherein the S wind ⁇ is the damper resistance.
• the above steps S202a to S202c also involve multiple times through the preset "some database” acquisition and required
• the process of "some certain resistance" corresponding to the large flue volume in which the data stored in each database (including the relationship between the data) can be some empirical data, or can be obtained in the actual operation process, and in the actual
• the continuation of the production process is also updated in real time, and the embodiment of the present invention is not limited.
• the corresponding data of the large flue air volume and the material layer resistance can be measured, for example, the damper is fully opened, and the resistance of the material layer is rl when the large flue air volume is fl, or the large flue when the material layer resistance is r2.
• the air volume is f2, and even the corresponding data can be fitted into a function, and then the corresponding data and/or the fitting function are stored in the first database, so that in the subsequent production, the step S202a can be passed through the preset A database acquires the resistance of the layer corresponding to the required large flue air volume.
• the main exhaust fan may be adjusted by adjusting the frequency of the main blower variable frequency motor, and/or by adjusting the hydraulic motor of the main exhaust fan, so that the main exhaust fan outputs a negative pressure.
• the required main exhaust fan negative pressure is satisfied.
• the specific implementation manner of adjusting the main exhaust fan according to the total negative pressure of the main exhaust fan may be performed by using the preferred method listed in this paragraph, or by other means in the prior art, and the embodiment of the present invention is not Make restrictions.
• the air volume required for obtaining the sintering trolley bellows may specifically include: including 0 2 , N 2 , NO, and N0 2 .
• a flue gas component analyzer can be arranged in the large flue under the sintering trolley. Referring to FIG. 3, the flue gas in the large flue is analyzed by the flue gas component analyzer to obtain NO in the flue gas. The content of N0 2 and the content of 0 2 and N 2 remaining after the reaction, and the contents of CO and C 2 2 in the flue gas can also be obtained.
• the required air volume of the sintering trolley bellows is obtained according to the effective wind rate and the preset effective wind volume required for the bellows.
• the required air volume of the bellows (that is, the total air volume provided by the bellows) is divided into two parts, one part is involved in sintering, which is called effective wind, and the remaining part is called invalid wind.
• the material to be sintered or being sintered Above the bellows is the material to be sintered or being sintered. The oxygen consumption of the material can be determined. Therefore, the air volume of the effective wind required for the bellows can be determined. If the relationship between the effective wind in the bellows and the required air volume of the bellows can be obtained, it is effective. Wind rate, then the required air volume of the bellows is also available.
• the oxygen in the air volume generated by the main exhaust fan is not completely consumed, but only a part of the oxygen participates in the sintering reaction. Therefore, by analyzing the composition of the flue gas after the reaction, the material consumption in the sintering process can be understood. Oxygen condition.
• the smoke component of the large flue gas is detected, and the main detection is the content of 0 2 , N 2 , NO, and N0 2 per unit volume of the flue gas, and the contents of co and co 2 can also be detected.
• the content of nitrogen and oxygen in the normal air is stable. According to the law of conservation of matter, the amount of nitrogen and oxygen in the flue gas can be calculated from the amount of nitrogen in the flue gas and the amount of nitrogen being oxidized, and according to the measured smoke. The amount of oxygen in the gas, using the formula can accurately calculate the amount of oxygen involved in the reaction. specific:
• the effective wind volume required for the windbox in the step S2012 is a preset value, which can be accurately collected and calculated according to the experience, the test data or the field, and the embodiment of the invention is not limited.
• the following steps may be included, that is, any position before step S2012, and preferably may further include:
• S200 Obtain an effective wind volume required by the preset wind box according to a preset vertical sintering speed and a preset effective air volume required for sintering the unit material.
• the Q-box effective ⁇ X Q ⁇ can be used to obtain the effective wind volume required for the preset bellows Q, which is the preset vertical sintering speed, and Q is the preset effective air volume required for sintering the unit material.
• Q ⁇ may be the air volume value in the standard state (1 atmosphere and 0 °C), then the calculated Q « is also the air volume in the standard state, and then converted to the actual working condition.
• the air volume value can be.
• the vertical sintering speed in the step S200 is a preset value, and can be accurately collected and calculated according to the experience, the test data, or the field.
• the embodiment of the present invention is not limited. In some embodiments of the present invention, when the method is accurately calculated, the following steps may be included, that is, any position before step S200, and preferably may further include:
• S200 ⁇ separately collects the running speed of the sintering trolley, the material thickness on the sintering trolley and the length of the sintering trolley; according to the running speed of the collected sintering trolley, the material thickness on the sintering trolley and the length of the sintering trolley The preset vertical sintering speed.
• the vertical sintering speed is regarded as the average vertical sintering speed at each bellows position, and the required air volume of each bellows is regarded as the average required air volume of each bellows.
• the car is the length of the sintering trolley, that is, the distance from the ignition furnace to the end of the sintering trolley.
• Embodiment 4 is a flow chart of a preferred step of the method according to the second embodiment of the present invention, and the first embodiment is omitted. The same part.
• This embodiment provides a main exhaust fan control system based on the first embodiment.
• the system includes:
• the large flue total air volume obtaining unit 501 is configured to obtain the required air volume of the sintering trolley bellows, and obtain the required large flue air volume according to the required air volume of the wind box;
• the large flue negative pressure obtaining unit 502 is configured to obtain a material layer resistance corresponding to the required large flue air volume in the preset first database, and obtain the location according to the material layer resistance and the required large flue air volume. Need heavy smoke negative pressure;
• a pipeline negative pressure acquiring unit 503 configured to acquire a pipeline resistance corresponding to a required large flue air volume in a preset second database, and obtain a required amount according to the pipeline resistance and the required large flue air volume The negative pressure consumed in the pipeline;
• the damper negative pressure obtaining unit 504 is configured to: acquire, in a preset third database, air leakage resistance corresponding to a required large flue air volume; according to the air leakage resistance, a required large flue negative pressure, and a required consumption Negative pressure on the pipeline to obtain the required air leakage of the pipeline; According to the required large flue air volume and the required air leakage of the pipeline, obtain the total air volume of the main exhaust fan required; Obtain the required large smoke in the preset fourth database The damper resistance corresponding to the amount of wind, according to the damper resistance and the total air volume of the main exhaust fan required, obtain the negative pressure required to be consumed on the damper;
• the total negative pressure obtaining unit 505 is configured to obtain the required total negative pressure of the main exhaust fan according to the required large flue negative pressure, the required negative pressure on the pipeline, and the required negative pressure on the damper;
• the main exhaust fan adjusting unit 506 is configured to adjust the main exhaust fan according to the total negative pressure of the main exhaust fan required.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
• Ventilation (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47966423

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (3)

Citations (4)

Family Cites Families (5)

• 2012
  • 2012-12-27 CN CN201210579049.8A patent/CN103017535B/zh active Active
• 2013
  • 2013-12-26 BR BR112015011374-5A patent/BR112015011374B1/pt active IP Right Grant
  • 2013-12-26 WO PCT/CN2013/090544 patent/WO2014101789A1/zh active Application Filing
  • 2013-12-26 RU RU2015120066A patent/RU2606680C2/ru active

Patent Citations (4)

Also Published As

Similar Documents

Legal Events