CN216972576U - Blast furnace air supply device and blast furnace production device - Google Patents

Abstract

The utility model discloses a blast furnace air supply device and a blast furnace production device, which are used for solving the technical problems of blockage of opening of a valve and blast furnace air quantity fluctuation caused by cold air backflow at the beginning of equipment operation. The blast furnace air supply device comprises an air blower and a conveying pipeline for connecting the air blower and a blast furnace, wherein the conveying pipeline comprises a main pipe, a branch pipe and more than three pressure equalizing pipes; the main pipe is provided with air supply valves, the number of the branch pipes is the same as that of the blast furnace, the branch pipes are provided with air distribution valves, each pressure equalizing pipe is provided with a pressure equalizing valve, and the pressure equalizing valves are respectively communicated with the air supply valves and the air distribution valves in parallel one by one through the pressure equalizing pipes; the aperture d3 of each pressure equalizing valve is smaller than the aperture d1 of the corresponding blast valve or the aperture d2 of the corresponding air distribution valve. Before opening blast valve, air distribution valve, make through the less equalizing valve of bore and will be long again rough cold air duct slowly be full of cold wind, and then make blast valve, air distribution valve fore-and-aft pressure unanimous, reduce the undulant technical problem of blast furnace amount of wind that jam trouble and cold wind refluence lead to.

Description

Blast furnace air supply device and blast furnace production device

Technical Field

The utility model relates to the technical field of smelting equipment, in particular to a blast furnace air supply device and a blast furnace production device.

Background

The blast furnace blower is a power mechanical equipment which can collect part of the atmosphere, increase the air pressure by pressurization to form blast furnace blower with certain pressure and flow, and then adjust the air pressure and air volume according to the requirements of the blast furnace condition and then convey the blast furnace blower to the blast furnace. The blast furnace blower is used for supplying air to the blast furnace so as to ensure oxygen required by coke combusted in the blast furnace and injected fuel. In addition, a certain wind pressure is required to overcome the resistance loss of an air supply system and a material column, and the blast furnace is kept at a certain furnace top pressure.

The blast furnace air-blower passes through pipeline and blast furnace intercommunication, and is provided with multiple valve on the pipeline to control amount of wind and wind pressure, but among the prior art, when adopting the great valve of bore, the easy problem that appears the card astringent of opening of valve, inconvenient operation regulation and control can have the undulant technical problem of blast furnace amount of wind that the cold wind refluence violently leads to in the beginning of opening valve, equipment work simultaneously.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a blast furnace air supply device and a blast furnace production device, which solve the problems of valve opening jam and blast furnace air quantity fluctuation.

The technical scheme for realizing the aim of the utility model is that the blast furnace air supply device comprises an air blower and a conveying pipeline for connecting the air blower and the blast furnace, wherein the conveying pipeline comprises a main pipe, more than two branch pipes communicated with the main pipe and more than three pressure equalizing pipes; the main pipe is provided with an air supply valve, each branch pipe is provided with an air distribution valve, and each pressure equalizing pipe is connected to the air supply valve and the inlet side and the outlet side of each air distribution valve in parallel; and each pressure equalizing pipe is provided with a pressure equalizing valve, and the caliber d3 of each pressure equalizing valve is smaller than the caliber d1 of the corresponding air supply valve or the caliber d2 of the corresponding air distribution valve.

Further, still be provided with the check valve on being responsible for, the input of check valve with the delivery outlet intercommunication of air-blower.

Further, the distance between the check valve and the air supply valve is less than 5000 mm.

Furthermore, the caliber of the check valve is d4, and d4 is more than or equal to 1000 mm.

Furthermore, the main pipe is also communicated with a pressure relief branch pipe, the communication position of the pressure relief branch pipe and the main pipe is positioned between the blower and the air supply valve, and the output end of the pressure relief branch pipe is communicated with the atmosphere; and the pressure relief branch pipe is provided with a pressure relief valve.

Further, the caliber of the pressure relief branch pipe is smaller than the caliber of the part of the main pipe communicated with the pressure relief branch pipe; the caliber of the pressure relief valve is d5, and d5 is more than or equal to 80mm and less than or equal to 120 mm.

Furthermore, a superposition section is arranged between the pressure equalizing pipe connected with the air supply valve in parallel and the pressure relief branch pipe, and the pressure relief valve is arranged behind the superposition section.

Further, d1 is more than or equal to 1000 mm; d2 is more than or equal to 1000 mm; d3 < 200 mm.

Furthermore, d3 is more than or equal to 80mm and less than or equal to 120 mm.

Based on the same inventive concept, the utility model also provides a blast furnace production device which comprises at least two blast furnaces and the blast furnace air supply device, wherein the blast furnaces are communicated with the branch pipes in a one-to-one correspondence manner.

According to the technical scheme, the blast furnace air supply device provided by the utility model comprises the blower and the conveying pipeline for connecting the blower and the blast furnace, wherein the conveying pipeline conveys gas with certain pressure and flow formed by the blower to the blast furnace. The conveying pipeline comprises a main pipe, more than two branch pipes communicated with the main pipe and more than three pressure equalizing pipes; the blast furnace is characterized in that the main pipe is provided with air supply valves, the branch pipes are the same as the blast furnace in number and are used for being communicated with the blast furnace in a one-to-one correspondence mode for air distribution, each branch pipe is provided with an air distribution valve, and air pressure and air volume adjustment is carried out through the air supply valves and the air distribution valves according to the requirements of the furnace conditions of the blast furnace. Each pressure equalizing pipe is respectively connected in parallel with the inlet side and the outlet side of the air supply valve and the air distribution valve, and is provided with a pressure equalizing valve, namely, the pressure equalizing valves are respectively communicated with the air supply valve and the air distribution valve in a one-to-one parallel mode through the pressure equalizing pipes, and a plurality of parallel passages are formed on a conveying pipeline. The air supply valve and the air distribution valve are large in opening diameter and are easy to block when opened, and then the air distribution valve is far away from the air blower and the air supply valve, and a blast pipeline is thick, so that cold air flows back from the side of the blast furnace to the other side of the air distribution valve when the air distribution valve is opened, and the problem of blast furnace air quantity fluctuation is caused. In the utility model, the aperture d3 of the equalizing valve is smaller than the aperture d1 of the corresponding blast valve or the aperture d2 of the corresponding air distribution valve, the equalizing valve is slowly stamped through the equalizing valve with a smaller aperture, before the blast valve and the air distribution valve are opened, the equalizing valve is firstly opened to enable the air distribution valve/the blast valve to be communicated front and back, and because the aperture of the equalizing valve is smaller, air behind the valve is slowly stamped towards the front of the valve to enable a long and rough cold air pipeline to be slowly filled with cold air, so that the front and back pressures of the blast valve and the air distribution valve are consistent, then the blast valve and the air distribution valve are opened, the technical problems of jam failure when the large-aperture valve is opened and fluctuation of blast furnace air volume caused by severe cold air backflow when the air distribution valve is opened are reduced, and the risk of blast furnace production is reduced.

The utility model provides a blast furnace production device which comprises at least two blast furnaces and the blast furnace air supply device, wherein the blast furnaces are communicated with the branch pipes in a one-to-one correspondence mode. The blast furnace production device has all the beneficial effects naturally, and effectively solves the technical problems that the air supply valve and the air distribution valve are large in diameter and easy to block, and the blast furnace air quantity is fluctuated due to backflow of cold air when the air distribution valve is opened.

Drawings

Fig. 1 is a schematic view of a blast furnace blower apparatus according to embodiment 1 of the present invention.

Reference numerals: 1-a blower; 2-conveying pipeline, 21-main pipe, 22-branch pipe and 23-pressure equalizing pipe; 3-air supply valve; 4-air distribution valve; 5-a pressure equalizing valve; 6-a check valve; 7-pressure relief branch pipe; 8-a pressure relief valve; 9-blast furnace.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

Blast furnace air supply system among the prior art is equipped with check valve, blast valve, air distribution valve etc. generally, nevertheless because the valve bore is great, appears the bite easily when opening, secondly the air distribution valve is far away from between the fan blast valve, and the blast pipe is thick, can cause the phenomenon that cold wind violently flows backwards from blast furnace side to air distribution valve opposite side when the air distribution valve is opened, leads to the undulant problem of blast furnace amount.

In order to solve the technical problems that in the prior art, the valve is blocked and inconvenient to open and the blast furnace air quantity fluctuates due to cold air backflow, the utility model provides a blast furnace air supply device and a blast furnace production device, so that the problem of blocking faults when the large-diameter valve is opened is reduced, the risk of influencing the production of the blast furnace is reduced, the problem of cold air backflow when the valve is opened is solved, and the normal operation of the blast furnace is ensured.

Example 1

The blast furnace air supply device provided by the embodiment comprises a blower 1 and a conveying pipeline 2 for connecting the blower 1 and a blast furnace 9, wherein the conveying pipeline 2 conveys gas with certain pressure and flow rate formed by the blower 1 to the blast furnace 9. The conveying pipeline comprises a main pipe 21, more than two branch pipes 22 communicated with the main pipe 21 and more than three pressure equalizing pipes 23; the main pipe 21 is provided with an air supply valve 3, the branch pipes 22 are the same as the blast furnace 9 in number and are used for being communicated with the blast furnace 9 in a one-to-one correspondence mode for air distribution, each branch pipe 22 is provided with an air distribution valve 4, and air pressure and air volume adjustment is carried out according to the requirements of the furnace conditions of the blast furnace 9 through the air supply valve 3 and the air distribution valve 4. The pressure equalizing pipes 23 are respectively connected in parallel to the inlet sides and the outlet sides of the air supply valves 3 and the air distribution valves 4, and pressure equalizing valves 5 are arranged on the pressure equalizing pipes 23, namely the pressure equalizing valves 5 are respectively communicated with the air supply valves 3 and the air distribution valves 4 in a one-to-one parallel mode through the pressure equalizing pipes 23, and a plurality of parallel passages are formed in the conveying pipeline 2. Because blast valve 3, distribution valve 4 bore are great, appear jamming easily when opening, secondly distribution valve 4 is far away from between air-blower 1, the blast valve 3 distance, and the blast pipe is thick, can cause cold wind to follow 9 side direction of blast furnace and distribute 4 opposite side refluences phenomena of air valve 4 when distributing valve 4 to open, leads to the undulant problem of blast furnace amount of wind. In the utility model, the aperture d3 of the equalizing valve 5 is smaller than the aperture d1 of the corresponding blast valve 3 or the aperture d2 of the air distribution valve 4, namely, is smaller than the aperture d1 of the corresponding blast valve 3 or the aperture d2 of the air distribution valve 4 which are communicated in parallel, so as to slowly punch through the equalizing valve 5 with smaller aperture, before opening the blast valve 3 and the air distribution valve 4, the pressure equalizing valve 5 is firstly opened to enable the air distribution valve 4/the blast valve 3 to be communicated front and back, and because the aperture of the pressure equalizing valve 5 is smaller, air behind the valve slowly punches towards the front of the valve, so that the long and rough cold air pipeline is slowly filled with cold air, and the front pressure and the rear pressure of the air supply valve 3 and the air distribution valve 4 are consistent, then the blast valve 3 and the air distribution valve 4 are opened, so that the technical problems of jamming failure when the large-diameter valve is opened and blast furnace air quantity fluctuation caused by cold air backflow when the air distribution valve 4 is opened are solved, and the production risk of the blast furnace 9 is reduced.

In the prior art, the diameter of an air supply pipe of the blower 1 is large, the pipeline is long, the air supply pipe is equivalent to a large initial container, when the blower 1 is stopped emergently and the pressure boosting capacity is lost, compressed air in an air pipe can quickly flow back from the discharge side to the suction side of the blower 1, so that secondary disaster accidents of the blower 1 are caused, and in order to protect the safety of the blower 1, in the embodiment, in order to ensure the stability of the system, the main pipe 21 is further provided with the check valve 6, and the input port of the check valve 6 is communicated with the output end of the blower 1.

In order to ensure the safety and reliability as much as possible, the check valve 6 should be installed behind the joint of the air release pipe and should be as close to the outlet of the blower 1 as possible, and generally, the distance between the check valve and the blower along the pipeline is about nine meters.

When the blast valve is closed, because the blast furnace side has cold wind of certain pressure intensity, so the pressure difference is big before and after the blast valve, if check valve and blast valve are farther away, need a large amount of cold wind to carry out evenly, can aggravate the fluctuation of cold wind refluence on the contrary. In order to effectively prevent the undulant technical problem of blast furnace amount of wind that cold wind refluence leads to, reduce the pressure-equalizing time simultaneously, in this embodiment, the interval between check valve 6 and the blast valve is less than 5000mm, preferably, the interval is less than 3000mm, can reduce blast valve both sides pressure-equalizing time, and can slow down the velocity of flow of cold wind refluence, guarantees the stability of blast furnace amount of wind.

In the embodiment, the air supply valve 3, the air distribution valve 4 and the check valve 6 are in large-caliber models, the caliber d1 of the air supply valve 3 is more than or equal to 1000mm, the caliber d2 of the air distribution valve 4 is more than or equal to 1000mm, and the caliber d4 of the check valve 6 is more than or equal to 1000 mm. The specific caliber value is not limited in this embodiment, and the design can be performed according to actual requirements, and generally, the calibers of the air supply valve 3, the air distribution valve 4 and the check valve 6 are all more than 1500 mm.

Just because check valve 6, blast valve 3, 4 bores of air distribution valve are great, generally more than 1.5 meters, appear the bite easily when opening, secondly air distribution valve 4 is far away from between fan blast valve 3, and the blast pipe is thick, can cause cold wind to follow blast furnace 9 side direction air distribution valve 4 opposite side refluence phenomenon when air distribution valve 4 opens, and blast furnace amount of wind undulant problem is more outstanding. In order to realize the technical effect of pressure equalization and backflow prevention through the pressure equalizing valve 5, in this embodiment, the aperture of the pressure equalizing valve 5 needs to be controlled to satisfy d3 < 200mm, preferably, d3 is greater than or equal to 80mm and less than or equal to 120mm so that the whole conveying pipeline 2 can be slowly filled with cold air, and the backflow speed of the cold air is controlled.

In order to relieve the pressure of the blast furnace air supply device and further ensure the normal operation, in the embodiment, the main pipe 21 is also communicated with a pressure relief branch pipe 7, the communication position of the pressure relief branch pipe 7 and the main pipe 21 is positioned between the blower 1 and the air supply valve 3, the input end of the pressure relief branch pipe 7 is communicated with the input end of the air supply valve 3, and the output end of the pressure relief branch pipe 7 is communicated with the atmosphere; the pressure relief branch pipe 7 is provided with a pressure relief valve 8 for controlling the conduction or the closing of the pressure relief branch pipe 7 so as to discharge gas into the atmosphere and ensure that the internal pressure of the blast furnace air supply device in the shutdown state is in a set range.

In order to ensure the stability of the pressure relief process and avoid influencing the air quantity fluctuation of the blast furnace 9, in this embodiment, the caliber of the pressure relief branch pipe 7 is smaller than the caliber of the part of the communicated main pipe 21, so as to slow down the discharge flow of the pressure relief and stabilize the slow-order pressure relief. This embodiment does not do the restriction to pipeline 2's structure, and pipeline 2's each pipeline section can the diameter invariable, can be the reducing pipeline section, can design according to actual demand.

In order to ensure the stability of pressure relief, in this embodiment, the aperture of the door of the pressure relief valve 8 is d5, and d5 is greater than or equal to 80mm and less than or equal to 120 mm.

In order to shorten the stroke of the gas flow, in the present embodiment, an overlap section is provided between the pressure equalizing pipe 23 connected in parallel with the blower valve 3 and the pressure relief branch pipe 7, and the relief valve 8 is provided after the overlap section, as shown in fig. 1.

In order to adapt to the production requirements of various blast furnaces 9 and simultaneously supply air to a plurality of blast furnaces 9 through one blower 1, in the blast furnace air supply device provided by the utility model, a conveying pipeline 2 comprises a main pipe 21 and branch pipes 22, the number of the branch pipes is the same as that of the blast furnaces 9, an air supply valve 3 is arranged on the main pipe 21, each branch pipe 22 is provided with an air distribution valve 4, each branch pipe 22 is slowly pressurized and filled with cold air through a pressure equalizing valve 5 which is connected with the air distribution valve 4 in parallel, and the main pipe 21 is slowly pressurized through the pressure equalizing valve 5 which is connected with the air supply valve 3 in parallel. In this embodiment, pipeline 2 includes two branch pipes 22 with 3 intercommunications of same blast valve, realizes that an air-blower 1 supplies air to two blast furnaces 9 simultaneously, and effectively solves the problem of the great easy bite of blast valve 3, distribution valve 4 bore and the undulant technical problem of blast furnace amount of wind that the cold wind refluence leads to when distribution valve 4 opened.

The using method and the principle of the blast furnace air supply device provided by the embodiment are as follows:

before opening blast valve 3, air distribution valve 4, at first open equalizing valve 5, make air distribution valve 4 front and back intercommunication, the air slowly punches to the valve front through small-bore equalizing valve 5 behind the valve, make again long and coarse cooling wind pipeline slowly be full of cold wind, make blast valve 3, air distribution valve 4 front and back pressure unanimous, then open blast valve 3, air distribution valve 4 again, the bite trouble when having reduced this kind of heavy-calibre valve and opening, reduce the risk that influences blast furnace 9 production, simultaneously with the very good cold wind refluence of solving, the undulant problem of blast furnace amount of wind, blast furnace 9 normal operating has been guaranteed.

Example 2

Based on the same inventive concept, the embodiment also provides a blast furnace production device which comprises at least two blast furnaces 9 and the blast furnace air supply device provided by the embodiment 1, wherein the blast furnaces 9 are communicated with the branch pipes 22 in a one-to-one correspondence manner, air is supplied to a plurality of blast furnaces 9 through one air blower 1, the production requirements of various blast furnaces 9 can be adapted, each branch pipe 22 is slowly pressurized and filled with cold air through a pressure equalizing valve 5 which is connected with an air distribution valve 4 in parallel, and the main pipe 21 is slowly pressurized through a pressure equalizing valve 5 which is connected with an air supply valve 3 in parallel. The blast furnace production device has all the beneficial effects naturally, and effectively solves the technical problems of large calibers of the air supply valve 3 and the air distribution valve 4 and easy jamming and blast furnace air quantity fluctuation caused by severe cold air backflow when the air distribution valve 4 is opened.

In this embodiment, the quantity of blast furnace 9 is two, and pipeline 2 includes two branch pipes 22 with 3 intercommunications of same blast valve, realizes that an air-blower 1 supplies air to two blast furnaces 9 simultaneously, and effectively solves the problem of the great easy bite of blast valve 3, the 4 bores of air distribution valve and the undulant technical problem of blast furnace amount of wind that the cold wind refluence leads to when air distribution valve 4 opens, guarantees the stability and the continuation of blast furnace amount of wind.

Through the embodiment, the utility model has the following beneficial effects or advantages:

1) according to the blast furnace air supply device provided by the utility model, the pressure equalizing valves are respectively arranged on the air supply valve and the air distribution valve in parallel, before the air supply valve and the air distribution valve are opened, the pressure equalizing valves are firstly opened to enable the front pressure and the rear pressure of the air supply valve and the air distribution valve to be consistent, and then the air supply valve and the air distribution valve are opened, so that the technical problem of the clamping fault when the large-caliber air supply valve and the large-caliber air distribution valve are opened is solved, and the risk of influencing the production of the blast furnace is reduced.

The blast furnace air supply device provided by the utility model can well solve the problem that cold air flows backwards when the blast furnace runs normally and the air distribution valve is opened. Firstly, opening the pressure equalizing valve before opening the air distribution valve to enable the air distribution valve to be communicated from front to back, punching air behind the valve to the front of the valve to enable the long and thick cold air pipeline to be filled with cold air, and opening the air distribution valve after the front pressure and the back pressure are consistent, so that the problems of cold air backflow and blast furnace air quantity fluctuation are perfectly solved.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A blast furnace air supply device is characterized by comprising an air blower and a conveying pipeline for connecting the air blower and a blast furnace, wherein the conveying pipeline comprises a main pipe, more than two branch pipes communicated with the main pipe and more than three pressure equalizing pipes; the main pipe is provided with an air supply valve, each branch pipe is provided with an air distribution valve, and each pressure equalizing pipe is connected to the air supply valve and the inlet side and the outlet side of each air distribution valve in parallel; and each pressure equalizing pipe is provided with a pressure equalizing valve, and the caliber d3 of each pressure equalizing valve is smaller than the caliber d1 of the corresponding air supply valve or the caliber d2 of the corresponding air distribution valve.

2. The blast furnace blower arrangement of claim 1, further comprising a check valve disposed in said main duct, an input of said check valve being in communication with an output of said blower.

3. The blast furnace blower of claim 2, wherein the gap between said check valve and said blower valve is less than 5000 mm.

4. The blast furnace blower according to claim 3, wherein the check valve has a diameter d4, d4 mm or more.

5. The blast furnace blower according to claim 1, wherein a pressure relief branch pipe is further provided in the main pipe in communication therewith, a communication point of the pressure relief branch pipe with the main pipe is located between the blower and the blast valve, and an output end of the pressure relief branch pipe is in communication with the atmosphere; and the pressure relief branch pipe is provided with a pressure relief valve.

6. The blast furnace blower according to claim 5, wherein the diameter of the pressure relief branch pipe is smaller than the diameter of the portion of the main pipe that communicates therewith; the caliber of the pressure relief valve is d5, and d5 is more than or equal to 80mm and less than or equal to 120 mm.

7. The blast furnace blowing device according to claim 6, wherein a coincidence section is provided between the pressure equalizing pipe connected in parallel with the blowing valve and the pressure relief branch pipe, and the pressure relief valve is provided after the coincidence section.

8. The blast furnace blower according to any of claims 1 to 7, wherein d1 is 1000mm or more; d2 is more than or equal to 1000 mm; d3 < 200 mm.

9. The blast furnace blower unit of claim 8, wherein d3 is 80mm or more and 120mm or less.

10. A blast furnace production device, which is characterized by comprising at least two blast furnaces and the blast furnace air supply device of any one of claims 1 to 9, wherein the blast furnaces are communicated with the branch pipes in a one-to-one correspondence manner.

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