CN216919312U - Novel blast furnace top material tank pressure equalizing and discharging system - Google Patents

Abstract

The utility model discloses a novel blast furnace top charging bucket pressure equalizing and discharging system, which comprises a nitrogen storage tank, a nitrogen equalizing pipe, a dust removal blow-off pipe and a communicating pipe, wherein a nitrogen equalizing pipe is communicated between the outlet of the nitrogen storage tank and the equalizing ports of the two charging buckets; the pressure equalizing ports of the two charging tanks are respectively communicated with the inlet of the dust removal diffusing pipe through a branch pipe; the outlet of the dust removal diffusing pipe is communicated with the inlet of the diffusing dust remover; a communicating pipe is communicated between the two charging tanks. The advantages are that: by additionally arranging the communicating pipe between the two charging tanks, the diffused gas can be used for replacing part of nitrogen, so that the utilization rate of the pressurized gas can be improved, the consumption of the nitrogen can be reduced, and the production cost can be reduced; the exhaust amount of the branch pipes corresponding to the charging buckets on the two sides is small, the amount of dust brought out is reduced, the pressure fluctuation in the exhaust dust remover is small, and the service life of the equipment is prolonged.

Description

Novel blast furnace top material tank pressure equalizing and discharging system

The technical field is as follows:

the utility model relates to the technical field of blast furnace iron making, in particular to a novel blast furnace top charging bucket pressure equalizing and discharging system.

The background art comprises the following steps:

the blast furnace is key equipment for iron making, and in order to improve production efficiency, at least two charging buckets are arranged at the top of the blast furnace, and are used for charging one by one and are used alternately. The process of charging the blast furnace top charging bucket into the blast furnace is as follows: the charging bucket and the hopper are in a normal pressure state, materials enter the charging bucket, then the upper sealing valve is closed, and the pressure equalizing system is used for equalizing the pressure of the charging bucket. Currently, most of large blast furnaces are pressure balanced by using a 2-time pressure equalizing method: the first pressure equalization uses clean gas, the gas is connected to the top of the furnace from a dry cloth bag and enters the charging bucket through a primary pressure equalizing valve, and when the pressure of the charging bucket is the same as the pressure of the clean gas, the primary pressure equalizing valve is closed; and then opening a secondary pressure equalizing valve, carrying out secondary pressure equalizing by using nitrogen, and finishing pressure equalizing when the pressure of the charging bucket is the same as the pressure in the furnace.

After pressure equalization, the pressure in the charging bucket is equalized with the pressure in the blast furnace, valves such as a lower sealing valve and the like are opened, materials in the charging bucket are placed in the blast furnace for distribution, and after distribution is finished, the charging bucket is filled with high-pressure coal gas and nitrogen gas with the same pressure as the pressure of the top of the furnace. Before the charging bucket is recharged, high-pressure gas in the charging bucket needs to be exhausted into the atmosphere after passing through a relief valve of a pressure equalizing and discharging system. However, since the high-pressure gas is diffused into the atmosphere at normal pressure, the particles such as dust and the like are discharged into the atmosphere by the airflow flowing at high speed, and the environment is polluted. When the pressure equalizing gas of the furnace top charging bucket is diffused, the diffused gas amount is large, and the gas in the charging bucket is exhausted to the environment close to the atmospheric pressure at extremely high speed and pressure difference, so that the gas has high dust content and large pressure fluctuation. Therefore, the prior pressure-equalizing gas dust recovery technology has the problems of large investment, short service life and difficult maintenance. In the use process, the pulse gas can often cause the problems of pressure fluctuation, dust content exceeding the standard and the like of a clean gas pipe network, so the use effect is not ideal.

The utility model has the following contents:

the utility model aims to provide a novel blast furnace top charging bucket pressure equalizing and discharging system capable of realizing utilization of pressure gas and reducing consumption of nitrogen.

The utility model is implemented by the following technical scheme: a novel blast furnace top charging bucket pressure equalizing and discharging system comprises a nitrogen storage tank, a nitrogen pressure equalizing pipe, a dust removal diffusing pipe and a communicating pipe, wherein one nitrogen pressure equalizing pipe is respectively communicated between an outlet of the nitrogen storage tank and pressure equalizing ports of two charging buckets, and a pressure regulating valve, a pressure equalizing valve and a check valve are sequentially arranged on the nitrogen pressure equalizing pipe along a conveying direction; the pressure equalizing ports of the two charging tanks are respectively communicated with the inlet of the dust removal blow-off pipe through a branch pipe, and the branch pipe is provided with a dust removal blow-off valve; the outlet of the dust removal diffusing pipe is communicated with the inlet of the diffusing dust remover; and a communicating pipe is communicated between the two charging buckets, and a communicating valve is arranged on the communicating pipe.

Furthermore, an emergency relief pipe is respectively communicated with the pressure equalizing port of each charging bucket, and an emergency relief valve is arranged on each emergency relief pipe; the outlet of the emergency diffusing pipe is communicated with the inlet of the cyclone dust collector, and the outlet of the cyclone dust collector is communicated with the inlet of the silencer.

Furthermore, a CO concentration detector is installed on the branch pipe at the inlet side of the dust removal blow-off valve and is electrically connected with the input end of the controller, and the output end of the controller is electrically connected with the dust removal blow-off valve and the emergency blow-off valve respectively.

Furthermore, a coal gas quick cut-off valve is arranged on the dust removal diffusing pipe.

Further, the quick coal gas cut-off valve inlet side install CO concentration detection appearance on the pipe of diffusing that removes dust, CO concentration detection appearance is connected with the input electricity of controller, the output of controller respectively with quick coal gas cut-off valve emergency diffusion valve electricity is connected.

The utility model has the advantages that: by additionally arranging the communicating pipe between the two charging tanks, the diffused gas can be used for replacing part of nitrogen, so that the utilization rate of the pressurized gas can be improved, the consumption of the nitrogen can be reduced, and the production cost can be reduced; the exhaust amount of the branch pipes corresponding to the charging buckets on the two sides is small, the amount of dust brought out is reduced, the pressure fluctuation in the exhaust dust remover is small, and the service life of the equipment is prolonged.

Description of the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

The device comprises a nitrogen storage tank 1, a nitrogen pressure equalizing pipe 2, a dedusting diffusing pipe 3, a communicating pipe 4, a charging bucket 5, a pressure regulating valve 6, a pressure equalizing valve 7, a check valve 8, a branch pipe 9, a dedusting diffusing valve 10, a diffusing deduster 11, a communicating valve 12, an emergency diffusing pipe 13, an emergency diffusing valve 14, a cyclone deduster 15, a silencer 16, a CO concentration detector 17, a controller 18 and a coal gas quick cut-off valve 19.

The specific implementation mode is as follows:

in the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, a novel blast furnace top charging bucket pressure equalizing and discharging system comprises a nitrogen storage tank 1, a nitrogen pressure equalizing pipe 2, a dust removal blow-off pipe 3 and a communicating pipe 4, wherein the nitrogen pressure equalizing pipe 2 is respectively communicated between an outlet of the nitrogen storage tank 1 and pressure equalizing ports of two charging buckets 5, and the nitrogen pressure equalizing pipe 2 is sequentially provided with a pressure regulating valve 6, a pressure equalizing valve 7 and a check valve 8 along a conveying direction; the pressure equalizing ports of the two charging pots 5 are respectively communicated with the inlet of the dust removing and diffusing pipe 3 through a branch pipe 9, and a dust removing and diffusing valve 10 is arranged on the branch pipe 9; the outlet of the dust removal diffusing pipe 3 is communicated with the inlet of a diffusing dust remover 11, and the diffusing dust remover 11 is a dust remover of a casting house; a communication pipe 4 is connected between the two buckets 5, and a communication valve 12 is attached to the communication pipe 4.

In order to prevent the CO concentration from suddenly increasing in the diffusing process and prevent accidents caused by the CO entering a dust removal system, an emergency diffusing pipe 13 is respectively communicated with a pressure equalizing port of each charging bucket 5, and an emergency diffusing valve 14 is arranged on each emergency diffusing pipe 13; the outlet of the emergency diffusing pipe 13 is communicated with the inlet of the cyclone dust collector 15, and the outlet of the cyclone dust collector 15 is communicated with the inlet of the silencer 16. When the CO concentration is in normal production, the emergency relief valve 14 is kept closed; when the CO concentration in the diffusing pipeline is too high, the dust removal diffusing valve 10 is closed, the emergency diffusing valve 14 is opened, and diffused gas is discharged from the emergency diffusing pipe 13, then is dedusted and silenced by the cyclone deduster 15 and the silencer 16 in sequence and then is discharged.

A CO concentration detector 17 is arranged on the branch pipe 9 at the inlet side of the dust removal diffusion valve 10, the CO concentration detector 17 is electrically connected with the input end of a controller 18, and the output end of the controller 18 is electrically connected with the dust removal diffusion valve 10 and the emergency diffusion valve 14. The CO concentration detector 17 is used for monitoring the CO concentration of the branch pipe 9 in real time, transmitting the monitored concentration information to the controller 18, closing the dust removal blow-off valve 10 and opening the emergency blow-off valve 14 when the CO concentration exceeds a set value, and the pressure equalizing gas must be blown off through the emergency blow-off pipe 13 and cannot enter the dust removal system.

The dust removal diffusion pipe 3 is provided with a gas quick cut-off valve 19, the dust removal diffusion pipe 3 at the inlet side of the gas quick cut-off valve 19 is provided with a CO concentration detector 17, the CO concentration detector 17 is electrically connected with the input end of a controller 18, and the output end of the controller 18 is electrically connected with the gas quick cut-off valve 19. The CO concentration detector 17 at the inlet side of the coal gas quick cut-off valve 19 is used for detecting the CO concentration in the dust removal diffusing pipe 3 and transmitting the CO concentration to the controller 18; when the CO concentration in the dust removal diffusion pipe 3 is less than that in the branch pipe 9, the leakage of the dust removal diffusion valve 10 is indicated; when the CO concentration of the dust removal diffusing pipe 3 exceeds a set value, the dust removal diffusing valve 10 and the coal gas quick cut-off valve 19 are closed, the emergency diffusing valve 14 is opened, and the pressure-equalizing gas must be diffused through the emergency diffusing pipe 13 and cannot enter a dust removal system.

When the system normally operates, the emergency relief valves 14 are kept closed, and the gas quick cut-off valve 19 is kept open; the pressure-equalizing process of the left side charging bucket discharging and the right side charging bucket discharging is as follows:

firstly, after the pressure equalization of the left charging bucket 5 is finished, closing a pressure equalizing valve 7 corresponding to the left charging bucket 5, keeping a dust removal blow-off valve 10 in a closed state, opening a communicating valve 12, enabling part of blow-off gas in the left charging bucket to enter the right charging bucket 5 through a communicating pipe 4, improving the pressure of the right charging bucket 5 by utilizing the blow-off gas of the left charging bucket 5, improving the utilization rate of the pressurized gas and reducing the consumption of nitrogen;

when the pressures in the two charging buckets 5 are equal, the communication valve 12 is closed, and the communication process is finished. And opening the corresponding dedusting and diffusing valve 10 of the left charging bucket 5, and discharging the residual diffused gas of the left charging bucket 5 into a diffusing deduster 11 through a dedusting and diffusing pipe 3. And closing the dust removal blow-off valve 10 corresponding to the left charging bucket 5 after the blow-off is finished. Meanwhile, the corresponding pressure equalizing valve 7 is opened to charge nitrogen into the right charging bucket 5 for pressure equalizing, the right charging bucket 5 and the furnace body are discharged after pressure equalizing, when the discharge of the right charging bucket 5 is finished and the discharge is required to be released, the pressure equalizing valve 7 corresponding to the right charging bucket is closed, the dedusting release valve 10 is kept in a closed state, the communicating valve 12 is opened, and the left charging bucket and the right charging bucket are communicated. After the communication is finished, the communication valve 12 is closed, and then the right charging bucket 5 is diffused.

The gas released by the two charging pots 5 is sent into the dust removal releasing pipe 3 through a branch pipe. The gas is monitored both before and during the gas diffusion process. When the numerical value of any monitoring point exceeds the standard, the pressure equalizing and discharging system and the dust removing system are isolated and cut off through valve linkage, and the safety of the dust removing system is ensured.

In the process of gas diffusion, the CO concentration is detected by each CO concentration detector 17, when any CO concentration detector 17 detects that the CO concentration exceeds a set concentration value, the dust removal diffusion valve 10 and the coal gas quick cut-off valve 19 are closed in time, the corresponding emergency diffusion valve 14 is opened, and the diffused gas is discharged through the emergency diffusion pipe 13.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A novel blast furnace top charging bucket pressure equalizing and discharging system comprises a nitrogen storage tank and nitrogen pressure equalizing pipes, and is characterized by further comprising a dust removal diffusing pipe and a communicating pipe, wherein one nitrogen pressure equalizing pipe is respectively communicated between an outlet of the nitrogen storage tank and pressure equalizing ports of two charging buckets, and a pressure regulating valve, a pressure equalizing valve and a check valve are sequentially arranged on the nitrogen pressure equalizing pipe along a conveying direction; the pressure equalizing ports of the two charging tanks are respectively communicated with the inlet of the dust removal blow-off pipe through a branch pipe, and the branch pipe is provided with a dust removal blow-off valve; the outlet of the dust removal diffusing pipe is communicated with the inlet of the diffusing dust remover; and a communicating pipe is communicated between the two charging buckets, and a communicating valve is arranged on the communicating pipe.

2. The novel blast furnace top charging bucket pressure equalizing and discharging system according to claim 1, wherein an emergency relief pipe is communicated with a pressure equalizing port of each charging bucket, and an emergency relief valve is mounted on each emergency relief pipe; the outlet of the emergency diffusing pipe is communicated with the inlet of the cyclone dust collector, and the outlet of the cyclone dust collector is communicated with the inlet of the silencer.

3. The system of claim 2, wherein a CO concentration detector is installed on the branch pipe at the inlet side of the dust removal bleeding valve, the CO concentration detector is electrically connected with the input end of a controller, and the output end of the controller is electrically connected with the dust removal bleeding valve and the emergency bleeding valve respectively.

4. The novel blast furnace top charging bucket pressure equalizing and discharging system according to claim 2 or 3, wherein a gas quick cut-off valve is installed on the dust removal diffusing pipe.

5. The novel blast furnace top charging bucket pressure equalizing and discharging system according to claim 4, characterized in that a CO concentration detector is installed on the dust removal bleeding pipe at the inlet side of the gas quick cut-off valve, the CO concentration detector is electrically connected with the input end of a controller, and the output end of the controller is electrically connected with the gas quick cut-off valve and the emergency bleeding valve respectively.

Images