Steelmaking converter gas recovery device with high recovery amount

Abstract

The utility model discloses a steelmaking converter gas recovery device with high recovery amount. The steelmaking converter gas recovery device comprises a converter, a dust removal and cooling assembly, an axial flow fan, a gas cooler, a gas cabinet, a CO analyzer, an oxygen analyzer, a diffusion chimney and a PLC control module. A gas outlet of the converter is communicated with the dedusting and cooling assembly through a pipeline; the dedusting and cooling assembly is communicated with the axial flow fan through a pipeline; the axial flow fan is communicated with the gas cooler through a pipeline; a gas outlet of the gas cooler is respectively communicated with the gas holder and a diffusion chimney pipeline; by adopting the method, the coal gas recovery amount of the converter per ton of steel can be increased by 22.8-29.5 m < 3 > / t under the conditions of safety production and avoidance of substandard flue gas emission, and the coal gas recovery amount is remarkably increased. And meanwhile, the recovery benefit of each ton of steel can be increased by 4.56-5.81 yuan / t, and the production cost of an enterprise is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of steelmaking, and in particular to a high recovery rate steelmaking converter gas recovery device. Background Art

[0002] In the steel production process, a large amount of coal gas is required for power generation in power plants, steel rolling, sintering, steel scrap baking, iron ladle, and steel ladle baking. The coal gas produced in the steelmaking converter process is combustible and has a high calorific value. If the coal gas is not recovered and directly discharged, it will be difficult to meet environmental protection requirements and will also cause energy waste.

[0003] The converter of a steel plant needs to ensure that the average CO content of the gas tank is kept at around 50-55% and the O2 content is below 1% to avoid explosion and ensure production safety. The existing methods to increase the gas recovery volume are mainly to extend the recovery time, increase the fan speed, increase the flow rate, and ensure that the temperature and vibration of the motor and fan equipment are normal, so that the converter production dust removal can achieve the desired effect.

[0004] However, if the flow rate is too large, the amount of air drawn into the furnace will increase, and at the same time, the amount of oxygen entering the flue will increase, thereby increasing the CO combustion consumption; and if the fan flow rate is small, the smoke and dust cannot be completely drawn out, causing the furnace to smoke, the dust removal effect is poor, and the environmental protection requirements are not met. The above reasons lead to the low recovery of existing converter gas.

[0005] In order to increase the recovery of converter gas, the method disclosed in CN202310595043.8, after the converter blowing is completed, the oxygen lance is raised and the converter coal recovery valve is closed for 30 seconds, that is, the gas recovery time is extended to increase the gas recovery amount. However, the converter gas recovery amount that can be increased by this method is only 5~6m 3 / t, generating economic benefits of 2.0-2.5 yuan / ton.steel. The amount of converter gas recovery is limited, making it difficult to achieve larger converter gas recovery requirements.

[0006] Existing technologies cannot achieve a high gas recovery rate while meeting production safety requirements. Utility Model Content

[0007] In order to solve the technical problem of low gas recovery in the prior art, the present application provides a high-recovery steelmaking converter gas recovery device, which can increase the gas recovery by 29%, significantly improving the converter gas recovery.

[0008] The present application provides a high recovery rate steelmaking converter gas recovery device, comprising: a converter, a dust removal and cooling component, an axial flow fan, a gas cooler, a gas cabinet, a CO analyzer, an oxygen analyzer, a venting chimney, and a PLC control module;

[0009] The air outlet of the converter is connected to the dust removal and cooling component pipeline; the dust removal and cooling component is connected to the axial flow fan pipeline; the axial flow fan is connected to the gas cooler pipeline; the air outlet of the gas cooler is connected to the gas cabinet and the venting chimney pipeline respectively;

[0010] The CO analyzer and oxygen analyzer are installed at intervals on the pipeline connecting the axial flow fan and the gas cooler;

[0011] The CO analyzer and the oxygen analyzer are electrically connected to the PLC control module respectively; the PLC control module is electrically connected to the display.

[0012] Preferably, it comprises: a venting cup valve; the venting cup valve is arranged on the gas outlet of the gas cooler and the venting chimney connecting pipeline.

[0013] Preferably, it comprises: a recovery cup valve; the recovery cup valve is arranged on the gas outlet of the gas cooler and the connecting pipeline of the gas cabinet.

[0014] Preferably, the PLC control module is electrically connected to the recovery cup valve.

[0015] Preferably, the PLC control module is electrically connected to the relief cup valve.

[0016] Preferably, the PLC control module is electrically connected to the axial flow fan.

[0017] Preferably, the dust removal and cooling component comprises: an evaporative cooler and a dry electrostatic precipitator connected in series.

[0018] The beneficial effects of this application include:

[0019] 1) The high recovery rate steelmaking converter gas recovery device provided in this application can achieve an increase of 22.8~29.5m³ / t of converter gas recovery per ton of steel under the condition of safe production and avoiding substandard flue gas emissions, and the gas recovery rate is significantly improved. At the same time, the economic benefit can be increased by 4.56~5.81 yuan / t per ton of steel recovery, effectively reducing the production cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a high recovery steelmaking converter gas recovery device provided for this application;

[0021] Figure 2 A schematic diagram of a module of a high recovery steelmaking converter gas recovery device provided for this application;

[0022] Legend:

[0023] Converter 1, evaporative cooler 2, dry electrostatic precipitator 3, axial flow fan 4, gas cooler 5, gas cabinet 6, CO analyzer 8, oxygen analyzer 7, vent chimney 11, vent cup valve 9, recovery cup valve 10, display 12. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Technical features that are not used to solve the technical problems of the present application are all set or installed according to the commonly used methods in the prior art and will not be described here.

[0027] See also Figure 1~2 The high-recovery steelmaking converter gas recovery device provided in this application includes: a converter 1, an evaporative cooler 2, a dry electrostatic precipitator 3, an axial flow fan 4, a gas cooler 5, a gas cabinet 6, a CO analyzer 8, an oxygen analyzer 7, a vent chimney 11, a vent cup valve 9, a recovery cup valve 10, and a display 12.

[0028] The exhaust port of the converter 1 is connected to the air inlet pipeline of the evaporative cooler 2; the exhaust port of the evaporative cooler 2 is connected to the pipeline of the dry electrostatic precipitator 3; the air outlet of the dry electrostatic precipitator 3 is connected to the air inlet pipeline of the axial flow fan 4; the air outlet of the axial flow fan 4 is connected to the pipeline of the gas cooler 5; the air outlet of the gas cooler 5 is connected to the gas tank 6 and the venting chimney 11 pipeline respectively. A recovery cup valve 10 is set on the pipeline connecting the air outlet of the gas cooler 5 to the gas tank 6; a venting cup valve 9 is set on the pipeline connecting the air outlet of the gas cooler 5 to the venting chimney 11. The converter flue gas that does not meet the gas recovery requirements is discharged through the venting chimney 11; the flue gas that meets the recovery requirements enters the gas tank 6 through the pipeline for storage and standby. The CO analyzer 8 and the oxygen analyzer 7 are arranged at intervals on the pipeline connecting the axial flow fan 4 and the gas cooler 5.

[0029] The CO analyzer 8 and the oxygen analyzer 7 are electrically connected to the PLC control module 11 respectively, so as to transmit control signals to the PLC control module 11 in real time; meanwhile, the PLC control module 11 is electrically connected to the axial flow fan 4, the dispersing cup valve 9, and the recovery cup valve 10 respectively, so as to control the recovery or discharge of the flue gas according to the content of CO and O2 in the obtained flue gas, thereby realizing the effective recovery of the flue gas.

[0030] The smoke exhaust port of the converter 1 is connected with the evaporative cooler 2 by pipeline. The smoke passing through the evaporative cooler 2 can reduce the smoke temperature and remove large particles in the smoke. The dust in the smoke is further removed by the dry electrostatic precipitator 3. The smoke after dust removal is extracted by the axial flow fan 4 to accelerate the flow. The CO and O2 contents are detected before entering the coal gas cooler 5, which can realize accurate control of coal gas recovery and improve the effect of coal gas recovery.

[0031] In a specific embodiment, when the CO content in the converter flue gas measured by the CO analyzer 8 is less than or equal to 10% and the oxygen content in the flue gas measured by the oxygen analyzer 7 is less than 1%, it means that the oxygen O2 content gradually decreases and the CO content gradually increases during the converter blowing process. At this time, the PLC control module 11 controls the venting cup valve 9 to close and the collecting cup valve 10 to open according to the analysis results obtained from the CO analyzer 8 and the oxygen analyzer 7, so as to realize the delivery of the gas contained in the cooled flue gas to the gas cabinet 6, and realize the recovery of 35Nm of gas per second. 3 , each furnace increases the recovery volume by 1400Nm 3 .

[0032] When the CO analyzer 8 measures that the CO content in the converter flue gas is less than or equal to 10% and the oxygen analyzer 7 measures that the oxygen content in the flue gas is less than 1%, the PLC control module 11 controls the fan speed of the axial flow fan 4 to increase by 4.5~6.4%, and the gas recovery flow rate is further increased by 18%.

[0033] The amount of gas recovered by this equipment increases by 22.8~29.5m³ / t.

[0034] Economic effect:

[0035] 1) After the device was used in the recovery of converter gas in a workshop, the steel output increased by 22.8m³ / t, and the benefit of steel recovery increased by 4.56 yuan per ton at 0.2 yuan / m³. The total output from February to August was 1,106,370 tons, generating benefits of 5,045,047 yuan.

[0036] 2) After the device was used in the recovery of converter gas in the second workshop, the output per ton of steel increased by 29.5m³ / t, and the increase in output per ton of steel was 0.2 yuan / m³; the benefit of recycling per ton of steel increased by: 29.5*0.2=5.81 yuan. The total output in June, July and August was 532,101.5 tons, generating benefits of 3,091,509 yuan.

[0037] By comparison, it can be seen that the use of the device provided in this application can effectively increase the amount of recovered gas and reduce the loss and ignition gas volume.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high recovery rate steelmaking converter gas recovery device, characterized in that: include: Converter, dust removal and cooling components, axial flow fan, gas cooler, gas cabinet, CO analyzer, oxygen analyzer, venting chimney, PLC control module; The air outlet of the converter is connected to the dust removal and cooling component pipeline; the dust removal and cooling component is connected to the axial flow fan pipeline; the axial flow fan is connected to the gas cooler pipeline; the air outlet of the gas cooler is connected to the gas cabinet and the venting chimney pipeline respectively; The CO analyzer and oxygen analyzer are installed at intervals on the pipeline connecting the axial flow fan and the gas cooler; The CO analyzer and the oxygen analyzer are electrically connected to the PLC control module respectively; the PLC control module is electrically connected to the display; It includes: a discharge cup valve; the discharge cup valve is arranged on the gas outlet of the gas cooler and the discharge chimney connecting pipeline; It includes: a recovery cup valve; the recovery cup valve is arranged on the gas outlet of the gas cooler and the connecting pipeline of the gas cabinet; The PLC control module is electrically connected to the recovery cup valve; The PLC control module is electrically connected to the discharge cup valve; The PLC control module is electrically connected to the axial flow fan; The dust removal and cooling components include: an evaporative cooler and a dry electrostatic precipitator connected in series.

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