CN221028510U

CN221028510U - Blast furnace group damping down gas full recovery system

Info

Publication number: CN221028510U
Application number: CN202322748979.8U
Authority: CN
Inventors: 洪军; 祁四清; 郭豪; 冯燕波; 李永军; 王得刚; 付忠旺; 蒋雨锟
Original assignee: MCC Capital Engineering and Research Incorporation Ltd
Current assignee: MCC Capital Engineering and Research Incorporation Ltd
Priority date: 2023-10-13
Filing date: 2023-10-13
Publication date: 2024-05-28
Anticipated expiration: 2033-10-13

Abstract

The utility model discloses a blast furnace group damping-down gas full recovery system, which belongs to the technical field of blast furnace ironmaking and aims to solve the problem that investment for recovering damping-down gas of a plurality of blast furnaces is large, wherein the blast furnace group damping-down gas full recovery system comprises a damping-down device (8) and a plurality of blast furnace damping-down gas full recovery branch lines, and blast furnace ascending pipes, blast furnace descending pipes, blast furnace coarse dust collectors, blast furnace fine dust collectors, pressure regulating valves and silencers are sequentially arranged on the blast furnace damping-down gas full recovery branch lines, the blast furnace damping-down gas full recovery branch lines share the damping-down device (8), and the damping-down device (8) can enable clean gas discharged by the blast furnace fine dust collectors to enter the outlet ends of the blast furnace damping-down gas full recovery branch lines. The blast furnace group damping-down gas full recovery system adopts a set of induced draft devices shared by a plurality of blast furnaces, thereby having the advantages of compact arrangement, small occupied area, low investment cost and the like.

Description

Blast furnace group damping down gas full recovery system

Technical Field

The utility model relates to the technical field of blast furnace ironmaking, in particular to a blast furnace group damping down gas full recovery system.

Background

Blast furnace damping down is a common operation state of iron-making production, and blast furnaces are subjected to damping down operation for a plurality of times according to production conditions every year. In general, the gas in the blast furnace is directly discharged into the atmosphere through a top gas discharge valve, and part of the gas contains a large amount of dust, CO and CO ₂.

In recent years, a plurality of blast furnaces are built in a certain area synchronously, and particularly in coastal areas, a 'blast furnace group' of 2 or more blast furnaces is formed, so that a clean factory with good environment, reasonable layout, low investment and small occupied area is built. Under the traditional condition, each blast furnace damping-down gas recovery system in the blast furnace group is independently arranged, namely, each blast furnace is provided with a respective damping-down gas recovery system, which has the defects of more buildings, scattered arrangement, large occupied area, large investment and the like.

Disclosure of utility model

In order to solve the problem that the investment for recovering the damping down gas by utilizing the respective recovery devices of the multiple blast furnaces is large, the utility model provides a blast furnace group damping down gas full recovery system, and the blast furnace group damping down gas full recovery system adopts the multiple blast furnaces to share one set of ventilation device, so that the blast furnace group damping down gas full recovery system has the advantages of compact arrangement, small occupied area, low investment cost and the like.

The technical scheme adopted by the embodiment of the utility model for solving the technical problems is as follows:

The utility model provides a blast furnace group damping down gas full recovery system, includes induced draft device and many blast furnace damping down gas full recovery branch lines, follows the entry end of blast furnace damping down gas full recovery branch line is to the direction of the exit end of blast furnace damping down gas full recovery branch line, blast furnace riser, blast furnace down pipe, blast furnace coarse dust remover, blast furnace fine dust remover, air-vent valve and muffler have been set gradually on the blast furnace damping down gas full recovery branch line, many blast furnace damping down gas full recovery branch line sharing induced draft device, induced draft device can make blast furnace fine dust remover exhaust clean gas get into the exit end of blast furnace damping down gas full recovery branch line.

The inlet ends of the blast furnace damping-down gas full recovery branch lines are connected with the furnace mouths of the blast furnaces in a one-to-one correspondence manner, and the outlet ends of the blast furnace damping-down gas full recovery branch lines are connected with a clean gas pipe network.

The induced air device is an ejector, the ejector comprises an ejected inlet, an ejected inlet and a mixed outlet, the outlet of each blast furnace fine dust remover is connected with the ejected inlet of the ejector through a corresponding ejected branch line, and the mixed outlet of the ejector is communicated with a clean gas pipe network through a mixed output pipeline.

The blast furnace group damping-down gas full-recovery system comprises a first blast furnace damping-down gas full-recovery branch line and a second blast furnace damping-down gas full-recovery branch line, wherein a first blast furnace ascending pipe, a first blast furnace descending pipe, a first blast furnace coarse dust remover, a first blast furnace fine dust remover, a first pressure regulating valve and a first silencer are sequentially arranged on the first blast furnace damping-down gas full-recovery branch line, and a second blast furnace ascending pipe, a second blast furnace descending pipe, a second blast furnace coarse dust remover, a second blast furnace fine dust remover, a second pressure regulating valve and a second silencer are sequentially arranged on the second blast furnace damping-down gas full-recovery branch line.

The induced draft device comprises two ejectors, wherein the two ejectors are a first ejector and a second ejector respectively; the outlet of the first blast furnace fine dust remover is connected with the ejected inlet of the first ejector through a first ejected branch line, and the outlet of the second blast furnace fine dust remover is connected with the ejected inlet of the first ejector through a second ejected branch line; the outlet of the first blast furnace fine dust remover is connected with the injection inlet of the first injector through a first injection branch line, and the outlet of the second blast furnace fine dust remover is connected with the injection inlet of the first injector through a second injection branch line; the mixed outlet of the first ejector is communicated with the injection inlet of the second ejector, and the mixed outlet of the second ejector is communicated with a clean gas pipe network through a mixed output pipeline; the first branch line that is penetrated is provided with first by penetrating the entry valves, the second is penetrated and is penetrated by penetrating the entry valves by the second on the branch line, the first branch line that penetrates is provided with first penetrating the entry valves, the second penetrates and is penetrated and be provided with the second on the branch line, be provided with the exit valve group on the mixed output line.

The induced draft device comprises two ejectors, wherein the two ejectors are a first ejector and a second ejector respectively; the outlet of the first blast furnace fine dust remover is communicated with the ejected inlet of the first ejector and the ejected inlet of the second ejector through a first ejected branch line, and the outlet of the second blast furnace fine dust remover is communicated with the ejected inlet of the first ejector and the ejected inlet of the second ejector through a second ejected branch line; the outlet of the first blast furnace fine dust remover is connected with the injection inlet of the first injector through a first injection branch line, and the outlet of the second blast furnace fine dust remover is connected with the injection inlet of the second injector through a second injection branch line; the mixed outlet of the first ejector is communicated with the mixed outlet of the second ejector, and the mixed outlet of the second ejector is communicated with a clean gas pipe network through a mixed output pipeline; the first branch line that is penetrated is provided with first by penetrating the entry valves, the second is penetrated and is penetrated by penetrating the entry valves by the second on the branch line, the first branch line that penetrates is provided with first penetrating the entry valves, the second penetrates and is penetrated and be provided with the second on the branch line, be provided with the exit valve group on the mixed output line.

The blast furnace group damping-down gas full-recovery system further comprises a third blast furnace damping-down gas full-recovery branch line, and a third blast furnace ascending pipe, a third blast furnace descending pipe, a third blast furnace coarse dust remover, a third blast furnace fine dust remover, a third pressure regulating valve and a third silencer are sequentially arranged on the third blast furnace damping-down gas full-recovery branch line.

The air inducing device comprises three ejectors, wherein the three ejectors are a first ejector, a second ejector and a third ejector respectively; the outlet of the first blast furnace fine dust remover is connected with the ejected inlet of the first ejector through a first ejected branch line, the outlet of the second blast furnace fine dust remover is connected with the ejected inlet of the first ejector through a second ejected branch line, and the outlet of the third blast furnace fine dust remover is connected with the ejected inlet of the first ejector through a third ejected branch line; the outlet of the first blast furnace fine dust remover is connected with the injection inlet of the first injector through a first injection branch line, the outlet of the second blast furnace fine dust remover is connected with the injection inlet of the first injector through a second injection branch line, and the outlet of the third blast furnace fine dust remover is connected with the injection inlet of the third injector through a third injection branch line; the mixed outlet of the first ejector is communicated with the injected inlet of the second ejector, the injected inlet of the second ejector is communicated with the injected inlet of the third ejector, the mixed outlet of the second ejector is communicated with the injected inlet of the third ejector, and the mixed outlet of the third ejector is communicated with a clean gas pipe network through a mixed output pipeline; the first branch line that is penetrated by penetrating is provided with first by penetrating the entry valves, the second is penetrated by penetrating and be provided with the second on the branch line, the third is penetrated by penetrating and be provided with the third on the branch line, the first branch line that penetrates is provided with first penetrating the entry valves, the second is penetrated and penetrate the entry valves, the third is penetrated and be provided with the third on the branch line, be provided with the exit valve group on the mixed output line.

The air inducing device comprises three ejectors, wherein the three ejectors are a first ejector, a second ejector and a third ejector respectively; the outlet of the first blast furnace fine dust remover is communicated with the ejected inlet of the first ejector, the ejected inlet of the second ejector and the ejected inlet of the third ejector through a first ejected branch line, the outlet of the second blast furnace fine dust remover is communicated with the ejected inlet of the first ejector, the ejected inlet of the second ejector and the ejected inlet of the third ejector through a second ejected branch line, and the outlet of the third blast furnace fine dust remover is communicated with the ejected inlet of the first ejector, the ejected inlet of the second ejector and the ejected inlet of the third ejector through a third ejected branch line; the outlet of the first blast furnace fine dust remover is connected with the injection inlet of the first injector through a first injection branch line, the outlet of the second blast furnace fine dust remover is connected with the injection inlet of the second injector through a second injection branch line, and the outlet of the third blast furnace fine dust remover is connected with the injection inlet of the third injector through a third injection branch line; the device comprises a first ejector, a second ejector, a third ejector, a mixing outlet of the first ejector, a mixing outlet of the second ejector, a mixing outlet of the third ejector, a mixing output pipeline of the second ejector and a clean gas pipe network, wherein the first ejector is communicated with the second ejector; the first branch line that is penetrated by penetrating is provided with first by penetrating the entry valves, the second is penetrated by penetrating and be provided with the second on the branch line, the third is penetrated by penetrating and be provided with the third on the branch line, the first branch line that penetrates is provided with first penetrating the entry valves, the second is penetrated and penetrate the entry valves, the third is penetrated and be provided with the third on the branch line, be provided with the exit valve group on the mixed output line.

And the pressure regulating valve and the silencer of each blast furnace damping down gas full recovery branch are connected with a blast furnace TRT or a blast furnace BPRT in parallel.

The embodiment of the utility model has the beneficial effects that:

1. The utility model adopts a set of induced draft device shared by a plurality of blast furnaces, thereby greatly saving funds and saving equipment occupation area.

2. The utility model can realize 100% total recovery of the damping-down gas, avoid environmental pollution, and save energy and reduce emission.

3. The utility model can adopt various high-pressure injection mediums, and steam, nitrogen or blast furnace gas can be selected according to local conditions, so that the applicability is strong.

4. The utility model has the advantages of short process flow, simple equipment, high degree of automation, safe and reliable system, and certain economic benefit and good environmental protection benefit.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a schematic diagram of a blast furnace group damping-down gas full recovery system according to the present utility model.

Fig. 2 is a schematic view of an ejector.

FIG. 3 is a schematic diagram of two blast furnaces sharing an ejector and a first blast furnace damping down a second blast furnace during normal production.

Fig. 4 is a schematic view of three blast furnaces sharing one injector.

Fig. 5 is a schematic diagram of two ejectors in series in an induced draft device.

FIG. 6 is a schematic diagram of two ejectors in parallel in an induced draft device.

FIG. 7 is a schematic diagram of three ejectors in series in an induced draft device.

FIG. 8 is a schematic diagram of three ejectors in parallel in an induced draft device.

The reference numerals are explained as follows:

101. A first blast furnace; 201. a first blast furnace riser; 301. a first blast furnace top bleed valve; 401. a first blast furnace downcomer; 501. a first blast furnace coarse dust remover; 601. a first blast furnace fine dust collector; 701. a first ejected inlet valve block; 801. a first ejector; 1001. a first blast furnace TRT or BPRT; 1101. a first pressure regulating valve; 1201. a first muffler; 1401. a first injection inlet valve block;

102. A second blast furnace; 202. a second blast furnace riser; 302. a second blast furnace top bleed valve; 402. a second blast furnace downcomer; 502. a second blast furnace coarse dust remover; 602. a second blast furnace fine dust collector; 702. a second ejected inlet valve block; 802. a second ejector; 1002. a second blast furnace TRT or BPRT; 1102. a second pressure regulating valve; 1202. a second muffler; 1402. a second injection inlet valve block;

703. A third ejected inlet valve block; 803. a third ejector; 1403. a third injection inlet valve block;

8. An induced draft device; 9. an outlet valve block; 13. and (5) purifying the gas pipe network.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in FIG. 1, the blast furnace group damping-down gas full recovery system of the embodiment of the utility model comprises a damping-down device 8 and a plurality of blast furnace damping-down gas full recovery branch lines, wherein a blast furnace ascending pipe, a blast furnace descending pipe, a blast furnace coarse dust remover, a blast furnace fine dust remover, a pressure regulating valve and a silencer are sequentially arranged on each blast furnace damping-down gas full recovery branch line along the direction from the inlet end of the blast furnace damping-down gas full recovery branch line to the outlet end of the blast furnace damping-down gas full recovery branch line, the plurality of blast furnace damping-down gas full recovery branch lines share the damping-down device 8, and the damping-down device 8 can enable clean gas discharged by the blast furnace fine dust remover to enter the outlet end of the blast furnace damping-down gas full recovery branch line.

The blast furnace group damping down gas full recovery system also comprises a clean gas pipe network 13 and a plurality of blast furnaces. The inlet ends of the blast furnace damping-down gas full recovery branch lines are connected with the furnace mouths of the blast furnaces in a one-to-one correspondence manner, and the outlet ends of the blast furnace damping-down gas full recovery branch lines are connected with a clean gas pipe network 13. The blast furnace group damping-down gas full recovery system adopts a set of induced draft devices 8 shared by a plurality of blast furnaces, and the induced draft devices 8 can enable the clean gas discharged by the blast furnace fine dust remover to enter a clean gas pipe network 13, so that the blast furnace group damping-down gas full recovery system has the advantages of compact arrangement, small occupied area, low investment cost and the like.

When the blast furnace starts the damping down operation, the gas pressure in the blast furnace is generally higher than 200kPa-250kPa and is far higher than the pressure in the clean gas pipe network 13, the pressure of the clean gas pipe network is generally about 10kPa-15kPa, the damping down gas can be recovered by utilizing the pressure difference between the blast furnace and the clean gas pipe network, and the high-pressure damping down gas is changed into clean gas after passing through a blast furnace ascending pipe, a blast furnace descending pipe, a blast furnace coarse dust remover and a blast furnace fine dust remover in sequence, enters TRT or BPRT to generate electricity and finally enters the clean gas pipe network 13. Along with the recovery of the damping down gas, the pressure difference between the blast furnace and the net gas pipe network is gradually reduced, so that the gas recovery rate is reduced, the recovery time is prolonged, and when the pressure of the top gas of the blast furnace is reduced to about 30kPa-40kPa, the blast furnace is switched to the damping down and diffusing gas recovery treatment by the damping down device 8.

As shown in fig. 2 to 4, the induced air device 8 is an ejector, the ejector comprises an ejected inlet a, an ejected inlet B and a mixed outlet C, the outlet of each blast furnace fine dust remover is communicated with the ejected inlet a of the ejector through corresponding ejected branch lines, the outlet of each blast furnace fine dust remover is also connected with the ejected inlet B of the ejector through corresponding ejected branch lines, and the mixed outlet C of the ejector is communicated with the clean gas pipe network 13 through a mixed output pipeline.

In this embodiment, the blast furnace group damping down gas full recovery system may include two or three blast furnace damping down gas full recovery branches, each blast furnace damping down gas full recovery branch includes one, the air inducing device 8 may also include two or three ejectors, the two or three ejectors may adopt a serial or parallel connection manner, and the following detailed description describes the manner in which the method may be implemented:

As shown in fig. 1, the blast furnace group damping-down gas full recovery system includes a first blast furnace damping-down gas full recovery branch line and a second blast furnace damping-down gas full recovery branch line, at this time, 2 blast furnaces are respectively a first blast furnace 101 and a second blast furnace 102, a first blast furnace riser 201, a first blast furnace down pipe 401, a first blast furnace coarse dust remover 501, a first blast furnace fine dust remover 601, a first pressure regulating valve 1101 and a first silencer 1201 are sequentially arranged on the first blast furnace damping-down gas full recovery branch line, and a second blast furnace riser 202, a second blast furnace down pipe 402, a second blast furnace coarse dust remover 502, a second blast furnace fine dust remover 602, a second pressure regulating valve 1102 and a second silencer 1202 are sequentially arranged on the second blast furnace damping-down gas full recovery branch line.

As shown in fig. 5, when the air induction device 8 includes two ejectors connected in series, the two ejectors are a first ejector 801 and a second ejector 802 respectively; the outlet of the first blast furnace fine dust remover 601 is communicated with the ejected inlet A of the first ejector 801 through a first ejected branch line, and the outlet of the second blast furnace fine dust remover 602 is communicated with the ejected inlet A of the first ejector 801 through a second ejected branch line; the outlet of the first blast furnace fine dust remover 601 is connected with an injection inlet B of the first injector 801 through a first injection branch line, and the outlet of the second blast furnace fine dust remover 602 is connected with an injection inlet B of the first injector 801 through a second injection branch line; the injected inlet A of the first injector 801 is communicated with the injected inlet A of the second injector 802, the mixed outlet C of the first injector 801 is communicated with the injected inlet B of the second injector 802, and the mixed outlet C of the second injector 802 is communicated with the clean gas pipe network 13 through a mixed output pipeline; the first branch line that is penetrated is provided with first by penetrating into the valve group 701, the second is penetrated and is penetrated by penetrating into the valve group 702 by the second on the branch line, the first branch line that penetrates is provided with first penetrating into the valve group 1401, the second is penetrated and penetrate into the valve group 1402 by the second on the branch line, the mixing output line is provided with outlet valve group 9.

As shown in fig. 6, when the air induction device 8 includes two ejectors connected in parallel, the two ejectors are a first ejector 801 and a second ejector 802 respectively; the outlet of the first blast furnace fine dust remover 601 is communicated with an ejected inlet A of the first ejector 801 and an ejected inlet A of the second ejector 802 through a first ejected branch line, and the outlet of the second blast furnace fine dust remover 602 is communicated with an ejected inlet A of the first ejector 801 and an ejected inlet A of the second ejector 802 through a second ejected branch line; the outlet of the first blast furnace fine dust remover 601 is connected with an injection inlet B of the first injector 801 through a first injection branch line, and the outlet of the second blast furnace fine dust remover 602 is connected with an injection inlet B of the second injector 802 through a second injection branch line; the injected inlet A of the first injector 801 is communicated with the injected inlet A of the second injector 802, the mixed outlet C of the first injector 801 is communicated with the mixed outlet C of the second injector 802, and the mixed outlet C of the second injector 802 is communicated with the clean gas pipe network 13 through a mixed output pipeline; the first branch line that is penetrated is provided with first by penetrating into the valve group 701, the second is penetrated and is penetrated by penetrating into the valve group 702 by the second on the branch line, the first branch line that penetrates is provided with first penetrating into the valve group 1401, the second is penetrated and penetrate into the valve group 1402 by the second on the branch line, the mixing output line is provided with outlet valve group 9.

The blast furnace group damping down gas full recovery system can further comprise a third blast furnace damping down gas full recovery branch line, wherein 3 blast furnaces are arranged at the moment, and the 3 blast furnaces are respectively a first blast furnace 101, a second blast furnace 102 and a third blast furnace. The third blast furnace damping down coal gas full recovery branch line is sequentially provided with a third blast furnace ascending pipe, a third blast furnace descending pipe, a third blast furnace coarse dust remover, a third blast furnace fine dust remover, a third pressure regulating valve and a third silencer.

As shown in fig. 7, when the air induction device 8 includes three ejectors in series, the three ejectors are a first ejector 801, a second ejector 802 and a third ejector 803 respectively; the outlet of the first blast furnace fine dust remover 601 is communicated with the ejected inlet A of the first ejector 801 through a first ejected branch line, the outlet of the second blast furnace fine dust remover 602 is communicated with the ejected inlet A of the first ejector 801 through a second ejected branch line, and the outlet of the third blast furnace fine dust remover is communicated with the ejected inlet A of the first ejector 801 through a third ejected branch line; the outlet of the first blast furnace fine dust remover 601 is connected with an injection inlet B of a first injector 801 through a first injection branch line, the outlet of the second blast furnace fine dust remover 602 is connected with an injection inlet B of the first injector 801 through a second injection branch line, and the outlet of the third blast furnace fine dust remover is connected with an injection inlet B of a third injector 803 through a third injection branch line; the injected inlet A of the first injector 801 is communicated with the injected inlet A of the second injector 802, the mixed outlet C of the first injector 801 is communicated with the injected inlet B of the second injector 802, the injected inlet A of the second injector 802 is communicated with the injected inlet A of the third injector 803, the mixed outlet C of the second injector 802 is communicated with the injected inlet B of the third injector 803, and the mixed outlet C of the third injector 803 is communicated with the clean gas pipe network 13 through a mixed output pipeline; the first ejected branch line is provided with a first ejected inlet valve group 701, the second ejected branch line is provided with a second ejected inlet valve group 702, the third ejected branch line is provided with a third ejected inlet valve group 703, the first injection branch line is provided with a first injection inlet valve group 1401, the second injection branch line is provided with a second injection inlet valve group 1402, the third injection branch line is provided with a third injection inlet valve group 1403, and the mixing output line is provided with an outlet valve group 9.

As shown in fig. 8, when the air induction device 8 includes three ejectors connected in parallel, the three ejectors are a first ejector 801, a second ejector 802 and a third ejector 803 respectively; the outlet of the first blast furnace fine dust collector 601 is communicated with an ejected inlet A of the first ejector 801, an ejected inlet A of the second ejector 802 and an ejected inlet A of the third ejector 803 through a first ejected branch line, the outlet of the second blast furnace fine dust collector 602 is communicated with an ejected inlet A of the first ejector 801, an ejected inlet A of the second ejector 802 and an ejected inlet A of the third ejector 803 through a second ejected branch line, and the outlet of the third blast furnace fine dust collector is communicated with an ejected inlet A of the first ejector 801, an ejected inlet A of the second ejector 802 and an ejected inlet A of the third ejector 803 through a third ejected branch line; the outlet of the first blast furnace fine dust remover 601 is connected with an injection inlet B of a first injector 801 through a first injection branch line, the outlet of the second blast furnace fine dust remover 602 is connected with an injection inlet B of a second injector 802 through a second injection branch line, and the outlet of the third blast furnace fine dust remover is connected with an injection inlet B of a third injector 803 through a third injection branch line; the injected inlet A of the first injector 801, the injected inlet A of the second injector 802 and the injected inlet A of the third injector 803 are communicated, the mixed outlet C of the first injector 801, the mixed outlet C of the second injector 802 and the mixed outlet C of the third injector 803 are communicated, and the mixed outlet of the second injector 802 is communicated with the clean gas pipe network 13 through a mixed output pipeline; a first ejected inlet valve group 701 is arranged on the first ejected branch line, a second ejected inlet valve group 702 is arranged on the second ejected branch line, a third ejected inlet valve group is arranged on the third ejected branch line, the first injection branch line is provided with a first injection inlet valve group 1401, the second injection branch line is provided with a second injection inlet valve group 1402, the third injection branch line is provided with a third injection inlet valve group 1403, and the mixing output line is provided with an outlet valve group 9.

In this embodiment, the pressure regulating valve and the muffler of each blast furnace damping down gas full recovery branch are connected in parallel with a blast furnace TRT or a BPRT. For example, a first blast furnace TRT or BPRT1001 is connected in parallel with a first pressure regulating valve 1101 and a first muffler 1201 of a first blast furnace damping gas full recovery branch, a second blast furnace TRT or BPRT1002 is connected in parallel with a second pressure regulating valve 1102 and a second muffler 1202 of a second blast furnace damping gas full recovery branch, and a third blast furnace TRT or BPRT is connected in parallel with a third pressure regulating valve and a third muffler of a third blast furnace damping gas full recovery branch.

The inlet end of the first blast furnace damping down gas full recovery branch line is connected with the first blast furnace 101, the inlet end of the second blast furnace damping down gas full recovery branch line is connected with the second blast furnace 102, and the inlet end of the third blast furnace damping down gas full recovery branch line is connected with the third blast furnace. The first blast furnace top diffusion valve 301 is arranged on the first blast furnace ascending pipe 201, the second blast furnace top diffusion valve 302 is arranged on the second blast furnace ascending pipe 202, and the third blast furnace top diffusion valve is arranged on the third blast furnace ascending pipe.

In the following, 2 blast furnaces are used to share a draft device, in order to describe the working process of the blast furnace group damping-down gas full recovery system, it is assumed that the first blast furnace 101 needs damping-down, and the second blast furnace 102 is normally produced, as shown in fig. 3.

When the first blast furnace 101 needs to have a damping down, the second blast furnace 102 uses the high-pressure clean gas of the second blast furnace 102 as a high-pressure injection gas source in normal production, the first injected inlet valve group 701 and the outlet valve group 9 are opened first, the second injected inlet valve group 1402 is opened, and the first injected inlet valve group 1401 and the second injected inlet valve group 702 are closed. The high-speed high-pressure injection medium is utilized to form local negative pressure in the induced draft device 8, the induced draft gas of the first blast furnace 101 is pumped into the induced draft device 8 and is recycled into the clean gas pipe network 13, so that the full recycling of the induced draft gas of the blast furnace is realized, and the first injected inlet valve group 701, the second injected inlet valve group 1402 and the outlet valve group 9 are closed until the induced draft of the first blast furnace 101 is finished, so that the induced draft is completed.

In the following, 3 blast furnaces share an induced draft device, in order to describe the working process of the blast furnace group damping down gas full recovery system, it is assumed that the first blast furnace 101 needs damping down, and the second blast furnace 102 and the third blast furnace are normally produced, as shown in fig. 4.

When the first blast furnace 101 needs to have a damping down, in normal production of the second blast furnace 102 and the third blast furnace, the first blast furnace 101 uses the high-pressure clean gas of the second blast furnace 102 or the third blast furnace as a high-pressure injection gas source, first, the first injected inlet valve group 701 and the outlet valve group 9 are opened, the second injected inlet valve group 1402 is opened or the third injected inlet valve group 1403 is opened, and the first injected inlet valve group 1401, the second injected inlet valve group 702 and the third injected inlet valve group 703 are closed. The high-speed high-pressure injection medium is utilized to form local negative pressure in the induced draft device 8, the induced draft gas of the first blast furnace 101 is pumped into the induced draft device 8 and is recycled into the clean gas pipe network 13, so that the full recycling of the induced draft gas of the blast furnace is realized, and after the induced draft of the first blast furnace 101 is finished, the first injected inlet valve group 701, the second injected inlet valve group 1402 or the third injected inlet valve group 1403 and the outlet valve group 9 are closed, so that the induced draft is completed.

All valve groups in the utility model adopt electric, pneumatic or hydraulic valves, and adopt two modes of remote PLC operation and local control. When the blast furnace normally operates, the inlet valve bank, the outlet valve bank and the injection valve bank of the damping down gas recovery device are in an effective closing state, which is equivalent to separating from a high-pressure clean gas pipe network and a low-pressure clean gas pipe network, and the original dry dust remover, TRT and the pressure regulating valve bank cannot be influenced. Various high-pressure injection mediums can be adopted, and steam, nitrogen or blast furnace gas can be selected according to local conditions; if steam injection is adopted, a buffer dehydrator can be added, and mechanical water entering a clean gas pipe network can be reduced. The induced draft device can adopt an ejector or a pressurized fan for replacement. The positions of the ejected inlet A and the ejected inlet B can be interchanged.

Noun interpretation:

TRT (blast furnace gas residual pressure turbine generator): the byproduct of blast furnace smelting, namely the pressure energy and heat energy of blast furnace top gas, is utilized to make the gas work through a turbine expander, so that the gas is converted into mechanical energy, and then the mechanical energy is converted into electric energy. The gas (high pressure gas) generated by the blast furnace enters the TRT device, and is expanded by the turbine to work to drive the generator to generate electricity, and the gas (low pressure gas) coming out of the turbine enters the low pressure pipe network.

BPRT (gas turbine and motor coaxially driven blast furnace blower): is a device which combines blast furnace blast and blast furnace gas residual pressure turbine power generation device into a whole.

The foregoing description of the embodiments of the utility model is not intended to limit the scope of the utility model, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the utility model shall fall within the scope of the patent. In addition, the technical features and technical features, technical features and technical scheme, technical scheme and technical scheme, and embodiments of the utility model can be freely combined for use.

Claims

1. The blast furnace group damping down gas full recovery system is characterized by comprising a damping down device (8) and a plurality of blast furnace damping down gas full recovery branch lines, wherein a blast furnace ascending pipe, a blast furnace descending pipe, a blast furnace coarse dust remover, a blast furnace fine dust remover, a pressure regulating valve and a silencer are sequentially arranged on the blast furnace damping down gas full recovery branch lines along the direction from the inlet end of the blast furnace damping down gas full recovery branch line to the outlet end of the blast furnace damping down gas full recovery branch line, the plurality of blast furnace damping down gas full recovery branch lines share the damping down device (8), and the damping device (8) can enable clean gas discharged by the blast furnace fine dust remover to enter the outlet end of the blast furnace damping down gas full recovery branch line.

2. The blast furnace group damping down gas full recovery system according to claim 1, wherein the inlet ends of the blast furnace damping down gas full recovery branch lines are connected with the furnace mouths of the blast furnaces in a one-to-one correspondence manner, and the outlet ends of the blast furnace damping down gas full recovery branch lines are connected with a clean gas pipe network (13).

3. The blast furnace group damping down coal gas full recovery system according to claim 1, wherein the air inducing device (8) is an ejector, the ejector comprises an ejected inlet, an ejected inlet and a mixed outlet, the outlet of each blast furnace fine dust remover is connected with the ejected inlet of the ejector through a corresponding ejected branch line, the outlet of each blast furnace fine dust remover is also connected with the ejected inlet of the ejector through a corresponding ejected branch line, and the mixed outlet of the ejector is communicated with a clean coal gas pipe network (13) through a mixed output pipeline.

4. The blast furnace group damping down gas full recovery system according to claim 1, wherein the blast furnace group damping down gas full recovery system comprises a first blast furnace damping down gas full recovery branch line and a second blast furnace damping down gas full recovery branch line, a first blast furnace ascending pipe (201), a first blast furnace descending pipe (401), a first blast furnace coarse dust remover (501), a first blast furnace fine dust remover (601), a first pressure regulating valve (1101) and a first silencer (1201) are sequentially arranged on the first blast furnace damping down gas full recovery branch line, and a second blast furnace ascending pipe (202), a second blast furnace descending pipe (402), a second blast furnace coarse dust remover (502), a second blast furnace fine dust remover (602), a second pressure regulating valve (1102) and a second silencer (1202) are sequentially arranged on the second blast furnace damping down gas full recovery branch line.

5. The blast furnace group damping down gas full recovery system according to claim 4, wherein the induced draft device (8) comprises two ejectors, and the two ejectors are a first ejector (801) and a second ejector (802) respectively;

The outlet of the first blast furnace fine dust collector (601) is connected with the ejected inlet of the first ejector (801) through a first ejected branch line, and the outlet of the second blast furnace fine dust collector (602) is connected with the ejected inlet of the first ejector (801) through a second ejected branch line;

The outlet of the first blast furnace fine dust remover (601) is connected with the injection inlet of the first injector (801) through a first injection branch line, and the outlet of the second blast furnace fine dust remover (602) is connected with the injection inlet of the first injector (801) through a second injection branch line;

The injected inlet of the first injector (801) is communicated with the injected inlet of the second injector (802), the mixed outlet of the first injector (801) is communicated with the injected inlet of the second injector (802), and the mixed outlet of the second injector (802) is communicated with a clean gas pipe network (13) through a mixed output pipeline;

The first injection branch line is provided with a first injection inlet valve group (701), the second injection branch line is provided with a second injection inlet valve group (702), the first injection branch line is provided with a first injection inlet valve group (1401), the second injection branch line is provided with a second injection inlet valve group (1402), and the mixing output line is provided with an outlet valve group (9).

6. The blast furnace group damping down gas full recovery system according to claim 4, wherein the induced draft device (8) comprises two ejectors, and the two ejectors are a first ejector (801) and a second ejector (802) respectively;

The outlet of the first blast furnace fine dust collector (601) is communicated with the ejected inlet of the first ejector (801) and the ejected inlet of the second ejector (802) through a first ejected branch line, and the outlet of the second blast furnace fine dust collector (602) is communicated with the ejected inlet of the first ejector (801) and the ejected inlet of the second ejector (802) through a second ejected branch line;

the outlet of the first blast furnace fine dust collector (601) is connected with the injection inlet of the first injector (801) through a first injection branch line, and the outlet of the second blast furnace fine dust collector (602) is connected with the injection inlet of the second injector (802) through a second injection branch line;

The injected inlet of the first injector (801) is communicated with the injected inlet of the second injector (802), the mixed outlet of the first injector (801) is communicated with the mixed outlet of the second injector (802), and the mixed outlet of the second injector (802) is communicated with a clean gas pipe network (13) through a mixed output pipeline;

7. The blast furnace group damping down gas full recovery system according to claim 4, further comprising a third blast furnace damping down gas full recovery branch line, wherein a third blast furnace riser, a third blast furnace downcomer, a third blast furnace coarse dust remover, a third blast furnace fine dust remover, a third pressure regulating valve and a third silencer are sequentially arranged on the third blast furnace damping down gas full recovery branch line.

8. The blast furnace group damping down gas full recovery system according to claim 7, wherein the induced draft device (8) comprises three ejectors, and the three ejectors are a first ejector (801), a second ejector (802) and a third ejector (803) respectively;

The outlet of the first blast furnace fine dust collector (601) is connected with the ejected inlet of the first ejector (801) through a first ejected branch line, the outlet of the second blast furnace fine dust collector (602) is connected with the ejected inlet of the first ejector (801) through a second ejected branch line, and the outlet of the third blast furnace fine dust collector is connected with the ejected inlet of the first ejector (801) through a third ejected branch line;

The outlet of the first blast furnace fine dust collector (601) is connected with the injection inlet of the first injector (801) through a first injection branch line, the outlet of the second blast furnace fine dust collector (602) is connected with the injection inlet of the first injector (801) through a second injection branch line, and the outlet of the third blast furnace fine dust collector is connected with the injection inlet of the third injector (803) through a third injection branch line;

The device comprises a first ejector (801), a second ejector (802), a third ejector (803), a mixing outlet of the first ejector (801), a mixing output pipeline and a clean gas pipe network (13), wherein the ejected inlet of the first ejector (801) is communicated with the ejected inlet of the second ejector (802), the mixing outlet of the first ejector (801) is communicated with the ejected inlet of the second ejector (802), the ejected inlet of the second ejector (802) is communicated with the ejected inlet of the third ejector (803), and the mixing outlet of the third ejector (803) is communicated with the clean gas pipe network (13);

The first ejected branch line is provided with a first ejected inlet valve group (701), the second ejected branch line is provided with a second ejected inlet valve group (702), the third ejected branch line is provided with a third ejected inlet valve group (703), the mixing device comprises a mixing output pipeline and is characterized in that a first injection inlet valve bank (1401) is arranged on the first injection branch line, a second injection inlet valve bank (1402) is arranged on the second injection branch line, a third injection inlet valve bank (1403) is arranged on the third injection branch line, and an outlet valve bank (9) is arranged on the mixing output pipeline.

9. The blast furnace group damping down gas full recovery system according to claim 7, wherein the induced draft device (8) comprises three ejectors, and the three ejectors are a first ejector (801), a second ejector (802) and a third ejector (803) respectively;

The outlet of the first blast furnace fine dust collector (601) is communicated with the ejected inlet of the first ejector (801), the ejected inlet of the second ejector (802) and the ejected inlet of the third ejector (803) through a first ejected branch line, the outlet of the second blast furnace fine dust collector (602) is communicated with the ejected inlet of the first ejector (801), the ejected inlet of the second ejector (802) and the ejected inlet of the third ejector (803) through a second ejected branch line, and the outlet of the third blast furnace fine dust collector is communicated with the ejected inlet of the first ejector (801), the ejected inlet of the second ejector (802) and the ejected inlet of the third ejector (803) through a third ejected branch line;

the outlet of the first blast furnace fine dust collector (601) is connected with the injection inlet of the first injector (801) through a first injection branch line, the outlet of the second blast furnace fine dust collector (602) is connected with the injection inlet of the second injector (802) through a second injection branch line, and the outlet of the third blast furnace fine dust collector is connected with the injection inlet of the third injector (803) through a third injection branch line;

The injected inlet of the first injector (801), the injected inlet of the second injector (802) and the injected inlet of the third injector (803) are all communicated, the mixed outlet of the first injector (801), the mixed outlet of the second injector (802) and the mixed outlet of the third injector (803) are all communicated, and the mixed outlet of the second injector (802) is communicated with a clean gas pipe network (13) through a mixed output pipeline;

10. The blast furnace group damping down gas full recovery system according to claim 1, wherein the pressure regulating valve and the silencer of each blast furnace damping down gas full recovery branch line are connected with a blast furnace TRT or a BPRT in parallel.