Environment-friendly dust removal system for backflow damping down of hot blast stove

Abstract

The utility model relates to the technical field of energy conservation and environmental protection, in particular to an environment-friendly dust removal system for backflow damping down of a hot blast stove, which comprises a gas pipeline, a diffusing pipeline, a flow slowing device, a cooler, a flow collecting device and a dust remover. The outlet end of the cooler is communicated with the flow collecting device which is communicated with the dust remover through a pipeline, and the dust remover is connected with the diffusing pipeline through a pipeline. High-temperature raw gas generated in the backflow damping-down process of the hot-blast stove enters the cooler through the flow slowing device, the contact area of the raw gas and a cooling pipe in the cooler is increased, the flow speed is reduced, and the raw gas rapidly enters the dust remover through the flow collecting device after being cooled, is filtered by a cloth bag and rapidly enters the diffusion pipeline under the driving action of the dust removal fan; and the backflow damping-down high-temperature raw gas of the hot blast stove can be quickly discharged after being filtered and purified, and the adverse effect on the environment caused by direct discharge of the raw gas is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy conservation and environmental protection, in particular to an environmentally friendly dust removal system for backflow and wind stop of a hot blast furnace. Background Art

[0002] my country is a major steelmaking nation. With the rapid development of its heavy industry, the market demand for metallurgy continues to expand, leading to varying degrees of environmental pollution. During the blast furnace production process, blast furnaces are often shut down for maintenance due to process or equipment issues. During shutdown, the fuel in the bosh slowly burns, producing gas that is slowly discharged through the large relief valve without blasting air. Therefore, a better method for discharging this gas is needed.

[0003] Backflow ventilation is a method of installing a gas backflow chimney on the hot blast main pipe, through which the undusted raw gas in the furnace belly is discharged. This type of backflow ventilation has a simple structure and low investment cost, and is currently the preferred method in the process design of blast furnace hot blast stoves.

[0004] The raw coal gas produced during the backflow ventilation process is directly discharged into the air. The coal gas contains a large amount of particulate pollutants, and the backflow ventilation pipes are generally low in height, causing relatively large pollution to the surrounding environment, which violates the current national environmental protection policy requirements. Utility Model Content

[0005] The purpose of the utility model is to provide an environmentally friendly dust removal system for backflow and rest air of a hot blast furnace, which slows down the gas flow rate, increases the heat exchange area, uses tubular water cooling to quickly reduce the temperature of the backflow and rest air gas, and uses bag dust removal to filter out particulate pollutants in the raw gas and then discharge the clean gas into the atmosphere.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an environmentally friendly dust removal system for backflow and wind-off of a hot blast furnace, comprising: a gas pipeline, a discharge pipeline, a slow-flow device, a cooler, a flow collecting device, and a dust collector. The gas pipeline is connected to the slow-flow device through a pipeline, the slow-flow device is connected to the inlet end of the cooler, the outlet end of the cooler is connected to the flow collecting device, the flow collecting device is connected to the dust collector through a pipeline, and the dust collector is connected to the discharge pipeline through a pipeline.

[0007] Preferably, it further comprises a gas valve, which is arranged on a pipeline connecting the gas pipeline and the slow flow device.

[0008] Preferably, the cooler includes a cooling water inlet pipe, a tubular heat exchange device, and a cooling water outlet pipe. The cooling water inlet pipe and the cooling water outlet pipe are respectively connected to the tubular heat exchange device, and cooling water flows into the inside.

[0009] Preferably, the dust collector includes a dust removal fan and a dust removal box, and the dust removal fan is arranged on the dust removal box.

[0010] Preferably, it also includes a dust removal and dispersing valve, which is arranged on the pipeline connecting the dust collector and the dispersing pipe.

[0011] Preferably, it further comprises an emergency relief valve, which is arranged on the relief pipeline.

[0012] Preferably, the dust removal box adopts a bag dust collector.

[0013] Preferably, a control system is further included, the current collecting device is provided with a temperature sensor, and the temperature sensor, gas valve and emergency relief valve are all electrically connected to the control system.

[0014] Preferably, the dust removal box and the tubular heat exchange device are both provided with pressure sensors, and the pressure sensors are electrically connected to the control system.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The high-temperature raw gas generated during the backflow shutdown process of the hot blast furnace enters the cooler through the slow flow device, increasing the contact area between the raw gas and the cooling pipe in the cooler and reducing the flow rate. After cooling, it passes through the rear-end collecting device and quickly enters the dust collector. After being filtered by the bag, it quickly enters the discharge pipe under the drive of the dust removal fan to complete the discharge of the backflow shutdown gas, realizing the rapid discharge of the high-temperature raw gas from the backflow shutdown of the hot blast furnace after completion of filtration and purification, reducing the adverse effects of direct discharge of raw gas on the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] In the figure: gas pipeline 1, slow flow device 2, cooler 3, flow collecting device 4, dust collector 5, discharge pipe 6, gas valve 7, dust discharge valve 8, emergency discharge valve 9, cooling water inlet pipe 31, tubular heat exchanger 32, cooling water outlet pipe 33, dust removal fan 51, dust removal box 52. DETAILED DESCRIPTION

[0019] In order to clearly and completely describe the purpose and technical solution of the present invention and make its advantages more clearly understood, the following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1 The utility model provides a technical solution: an environmentally friendly dust removal system for backflow and wind-off of a hot blast furnace, comprising: a gas pipeline 1, a slow-flow device 2, a cooler 3, a flow collecting device 4, a dust collector 5, and a discharge pipeline 6. The gas pipeline 1 is connected to the slow-flow device 2 through a pipeline, the slow-flow device 2 is connected to the inlet end of the cooler 3, the outlet end of the cooler 3 is connected to the flow collecting device 4, the flow collecting device 4 is connected to the dust collector 3 through a pipeline, and the dust collector 3 is connected to the discharge pipeline 6 through a pipeline.

[0021] It also includes a gas valve 7, which is arranged on the pipeline connecting the gas pipeline 1 and the flow-reducing device 2.

[0022] The cooler 3 includes a cooling water inlet pipe 31, a tubular heat exchanger 32, and a cooling water outlet pipe 33. The cooling water inlet pipe 31 and the cooling water outlet pipe 33 are respectively connected to the tubular heat exchanger 32, and cooling water is passed into the interior. The tubular heat exchanger 32 is used in the middle of the cooler 3. The welding points of the heat exchanger tube bends of this heat exchanger are all located outside the shell, which facilitates rapid leak detection and treatment. The internal pipelines are all composed of a single copper tube. At the same time, the copper tubes are equipped with aluminum fins, copper fins, or stainless steel fins to increase the heat exchange area. A nitrogen purge device is also provided to quickly clean the floating dust in the tubular heat exchanger 32, ensuring the heat exchange efficiency of the cooler 3 during the backflow and wind-down process.

[0023] The dust collector 5 includes a dust removal fan 51 and a dust removal box 52 , and the dust removal fan 51 is disposed on the dust removal box 52 .

[0024] It also includes a dust removal and dispersing valve 8, which is arranged on the pipeline connecting the dust collector 5 and the dispersing pipe 6.

[0025] It also includes an emergency relief valve 9 , which is arranged on the relief pipe 6 .

[0026] The dust removal box 52 adopts a bag dust collector.

[0027] This embodiment utilizes a flow-slowing device 2 to slow the flow rate of the raw gas, quickly increasing the contact area between the gas and the internal tubular heat exchanger 32 of the cooler 3, achieving rapid cooling of the raw gas. The rapidly cooled raw gas then passes through a flow collector 4 to connect with the dust collector 5, accelerating the flow rate before entering the next stage. The flow rate is then regulated and controlled via a gas valve 7 during the flow process. After cooling, the hot blast furnace's backflowing waste gas rapidly enters the dust collector 5, where it is filtered for particulate matter by a dust removal box 52. The filtered clean gas is then delivered to a discharge duct 6 via a dust removal blower 51. The dust-cleaned backflowing waste gas passes through an open dust removal discharge valve 8, is then directed through the discharge duct 6 to a high altitude for high-altitude release.

[0028] In this embodiment, a temperature sensor is provided on the side of the flow collecting device 4, and the temperature sensor, the gas valve 7, and the emergency relief valve 9 are all connected to the control system. When the control system detects that the gas temperature exceeds the set temperature, it automatically adjusts the opening of the gas valve 7. By adjusting the flow rate, the gas temperature is kept within the allowable range to prevent the dust bag from burning. When the gas valve 7 cannot meet the gas temperature requirement even after being adjusted to the limit position, the emergency relief valve 9 is opened and the gas valve 7 is closed.

[0029] The gas side of the tubular heat exchanger 32 and the dust removal box 52 are both equipped with pressure sensors, which are also connected to the control system. When the control system detects that the pressure is higher than the set value, it will be linked to the gas valve 7 and the emergency relief valve 9, gradually closing the gas valve 7 and partially opening the emergency relief valve 9 to stabilize the pressure of the tubular heat exchanger 32 and the dust removal box 52.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly dust removal system for backflow and rest of hot blast furnace, comprising: The gas pipeline and the discharge pipeline are characterized in that they also include a slow flow device, a cooler, a flow collecting device, and a dust collector. The gas pipeline is connected to the slow flow device through a pipeline, the slow flow device is connected to the inlet end of the cooler, the outlet end of the cooler is connected to the flow collecting device, the flow collecting device is connected to the dust collector through a pipeline, and the dust collector is connected to the discharge pipeline through a pipeline.

2. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 1 is characterized by: It also includes a gas valve, which is arranged on a pipeline connecting the gas pipeline and the slow flow device.

3. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 2 is characterized by: The cooler includes a cooling water inlet pipe, a tubular heat exchange device, and a cooling water outlet pipe. The cooling water inlet pipe and the cooling water outlet pipe are respectively connected to the tubular heat exchange device, and cooling water is introduced into the inside.

4. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 3 is characterized by: The dust collector comprises a dust removal fan and a dust removal box, and the dust removal fan is arranged on the dust removal box.

5. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 1 is characterized by: It also includes a dust removal and dispersing valve, which is arranged on a pipeline connecting the dust collector and the dispersing pipeline.

6. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 4 is characterized by: It also includes an emergency relief valve, which is arranged on the relief pipeline.

7. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 4 is characterized by: The dust removal box adopts a bag dust collector.

8. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 6 is characterized by: It also includes a control system. The current collecting device is provided with a temperature sensor. The temperature sensor, the gas valve and the emergency relief valve are all electrically connected to the control system.

9. The environmentally friendly dust removal system for backflow and rest of hot blast furnace according to claim 8, characterized in that: The dust removal box and the tubular heat exchange device are both provided with pressure sensors, and the pressure sensors are electrically connected to the control system.

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