CN111350854A - Blast furnace coal injection pipeline backfire-proof backstop - Google Patents
Blast furnace coal injection pipeline backfire-proof backstop Download PDFInfo
- Publication number
- CN111350854A CN111350854A CN202010200399.3A CN202010200399A CN111350854A CN 111350854 A CN111350854 A CN 111350854A CN 202010200399 A CN202010200399 A CN 202010200399A CN 111350854 A CN111350854 A CN 111350854A
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- channel
- blast furnace
- passageway
- backfire
- injection pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0245—Construction of housing; Use of materials therefor of lift valves with ball-shaped valve members
Abstract
The invention discloses a blast furnace coal injection pipeline backfire-proof backstop, which comprises: the valve comprises a valve body, a first channel extending along the vertical direction is formed in the middle of the valve body, and an upper sealing interface body and a lower sealing interface body which are connected with the first channel are respectively arranged at the upper end and the lower end of the valve body; be provided with the sealed spheroid that the diameter is the same with first passageway internal diameter in the first passageway, sealed spheroid can be located the first passageway and slide from top to bottom, and the side of valve body is formed with the second passageway that extends towards oblique top direction, and the one end of second passageway is connected with the first passageway, and the other end is provided with the coal gun interface. The blast furnace coal injection pipeline anti-backfire check device overcomes the defects of large resistance, quick abrasion, poor anti-interference capability and short service life of an anti-backflow check body when the anti-backflow check body conveys solid substances, improves the reliability of a hot air anti-backflow device in a blast furnace, and greatly prolongs the service life of a safety valve.
Description
Technical Field
The invention relates to an anti-backfire backstop for a blast furnace coal injection pipeline.
Background
The front injection pressure of the coal gun is greater than the internal pressure of the coal gun at the back by 50kpa under the normal coal injection state of the blast furnace, so that the pulverized coal is conveyed into the furnace. However, when the injection system fails, the pipeline is blocked, the pressure of the injected gas (nitrogen or compressed air) suddenly fluctuates greatly, and the blast furnace is seriously damaged, and slag is filled into the tuyere, the pressure at the front end of the coal injection gun is lower than the pressure in the blast furnace, so that high-temperature hot air (about 1200 ℃) in the blast furnace flows back out of the blast furnace. In order to avoid the damage of normal-temperature and normal-pressure injection pipelines and auxiliary devices outside the furnace and the expansion of accidents under the condition, a safety check valve is required to be additionally arranged in front of a coal gun to protect external injection equipment.
The conventional coal injection check valve has two structures, namely a swing valve and a ball valve, wherein the swing valve backflow prevention check body is positioned in the central position of fluid, so that when solid substances are conveyed, the resistance is large, the abrasion is fast, the service life is short, if the valve port is not timely abraded, the valve port cannot play a role in preventing backfire frequently due to poor sealing when furnace backflow occurs; the sealing surface of the ball valve is irregular, the sealing effect is poor, the non-return bodies of the two valve bodies are in a suspended unstable state during conveying of pulverized coal, and the fluctuation of the coal conveying quantity can be caused by the change of the positions of the non-return bodies during conveying or pressure fluctuation in a furnace.
Disclosure of Invention
The invention aims to provide a blast furnace coal injection pipeline anti-backfire check device which adopts a ball type sliding valve structure, no check body is arranged in a conveying flow channel, the defects of large resistance, quick abrasion, poor anti-interference capability and short service life of the anti-backfire check body during conveying of solid substances are overcome, the reliability of a hot air anti-backfire device in a blast furnace is improved, and the service life of a safety valve is greatly prolonged.
In order to achieve the above object, the present invention provides an anti-backfire arrestor for a blast furnace coal injection pipeline, comprising: the valve comprises a valve body, a first channel extending along the vertical direction is formed in the middle of the valve body, and an upper sealing interface body and a lower sealing interface body which are connected with the first channel are respectively arranged at the upper end and the lower end of the valve body; the sealing ball body is arranged in the first channel, the diameter of the sealing ball body is the same as the inner diameter of the first channel, the sealing ball body can be located in the first channel and can slide up and down, a second channel extending towards the oblique upper direction is formed on the side face of the valve body, one end of the second channel is connected with the first channel, and a coal gun connector is arranged at the other end of the second channel.
Preferably, the inner diameter of the first passage is larger than that of the second passage, and the inner diameter of the second passage is the same as that of the lower sealing interface body.
Preferably, the inner diameter of the upper sealing interface body is smaller than the inner diameter of the second channel.
Preferably, the upper sealing interface body and the lower sealing interface body are provided with spherical surfaces attached to the sealing ball body at ends facing the first channel.
Preferably, the angle between the second channel and the first channel is 25-35 °.
Preferably, the valve body, the sealing ball body, the coal gun interface, the upper sealing interface body and the lower sealing interface body all have high temperature resistance and wear resistance.
According to the technical scheme, the blast furnace coal injection pipeline anti-backfire check device adopts a ball type sliding valve structure, and no check body is arranged in the conveying flow channel, so that the defects of large resistance, quick abrasion, poor anti-interference capability and short service life of the anti-backfire check body when the anti-backfire check body conveys solid substances are overcome, the reliability of a hot air anti-backfire device in the blast furnace is improved, and the service life of a safety valve is greatly prolonged. The device overcomes the defects of non-wear resistance and short service life of the original equipment, and the sealing ball body and the sealing surface have small wear in working, high reliability, low failure rate, convenient maintenance and cleaning, convenient operation, simple structure, convenient manufacture and low cost.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of a preferred embodiment of a blast furnace coal injection line flashback arrestor.
Description of the reference numerals
1. A lower sealing interface body; 2. a valve body; 3, sealing the ball body; 4. an upper sealing interface body; 5. a coal gun interface.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, directional words included in terms such as "upper, lower, left, right, front, rear, inner, and outer" and the like merely represent the directions of the terms in a normal use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.
Referring to fig. 1, the blast furnace coal injection pipeline anti-backfire backstop comprises: the valve comprises a valve body 2, wherein a first channel extending along the vertical direction is formed in the middle of the valve body 2, and an upper sealing interface body 4 and a lower sealing interface body 1 which are connected with the first channel are respectively arranged at the upper end and the lower end of the valve body 2; the coal gun valve is characterized in that a sealing ball body 3 with the same diameter as the inner diameter of the first channel is arranged in the first channel, the sealing ball body 3 can be located in the first channel and slide up and down, a second channel extending towards the oblique upper direction is formed on the side face of the valve body 2, one end of the second channel is connected with the first channel, and a coal gun connector 5 is arranged at the other end of the second channel.
Through the implementation of the technical scheme, the blast furnace coal injection pipeline anti-backfire check device adopts a ball type sliding valve structure, no check body is arranged in the conveying flow channel, the defects of large resistance, quick abrasion, poor anti-interference capability and short service life of the anti-backflow check body when the anti-backflow check body conveys solid substances are overcome, the reliability of the hot air anti-backflow device in the blast furnace is improved, and the service life of the safety valve is greatly prolonged. The defects of non-wear resistance and short service life of the original equipment are overcome, the sealing ball body 3 and the sealing surface are small in wear during working, high in reliability, low in failure rate, convenient to maintain and clean, convenient to operate, simple in structure, convenient to manufacture and low in cost.
When the coal injection device is used, the upper sealing connector body 4 is connected with a pressure detection device in the furnace, the lower sealing connector body 1 is connected with a coal injection pipeline of a coal distribution screen in the front of the furnace, and the coal gun connector 5 is connected with a tuyere branch pipe coal gun. When in normal coal injection, the injection pressure is higher than the pressure in the furnace at the outlet of the coal gun, the sealing ball 3 is positioned above the lower opening of the second channel under the action of pressure difference, and coal is supplied through a channel formed by the lower sealing interface body 1, the first channel and the coal gun interface 5 in sequence; under abnormal conditions, when the injection pressure at the side of the lower sealing interface body 1 is smaller than the pressure in the furnace at the side of the coal gun interface 5, media in the channel flow in the directions of the coal gun interface 5, the first channel and the lower sealing interface body 1, when the sealing ball body 3 is at the lower opening position of the second channel, the sealing ball body 3 moves downwards under the combined action of the gravity and the pressure difference of the ball body, and after the sealing ball body 3 descends to the lower opening position, the sealing ball body is pushed by a flow guide medium to quickly descend to the bottom of the first channel, the lower sealing interface body 1 is sealed, the backflow stopping channel is closed, and the functions of protecting the normal-temperature and normal-pressure injection pipeline outside the furnace and the auxiliary device are.
In this embodiment, in order to obtain better delivery and non-return effects, it is preferable that the inner diameter of the first passage is larger than the inner diameter of the second passage, which is the same as the inner diameter of the lower sealing interface body 1.
In this embodiment, in order to obtain better delivery and non-return effects, it is preferable that the inner diameter of the upper sealing interface body 4 is smaller than the inner diameter of the second passage.
In this embodiment, in order to obtain better sealing effect, preferably, the ends of the upper sealing interface body 4 and the lower sealing interface body 1 facing the first channel are both provided as spherical surfaces fitting with the sealing sphere 3.
In this embodiment, in order to obtain better coal supply effect, the included angle between the second channel and the first channel is preferably 25-35 °.
In this embodiment, in order to obtain better high temperature and wear resistance and longer service life, it is preferable that the valve body 2, the sealing ball 3, the coal gun port 5, the upper sealing port body 4 and the lower sealing port body 1 have high temperature and wear resistance. The valve body 2, the sealing ball body 3, the coal gun interface 5, the upper sealing interface body 4 and the lower sealing interface body 1 can be made of any one of the metal materials with high temperature resistance and wear resistance in the field, such as: the valve body 2, the coal gun connector 5, the upper sealing connector 4 and the lower sealing connector 1 are made of metallurgical composite bimetallic steel pipes, the base layer is 16Mn, the inner layer is made of composite Cr15-Cr26 high-chromium cast steel, the outer layer of the sealing ball 3 is made of composite Cr15-Cr26 high-chromium cast steel, and the inner layer is 16 Mn.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. The utility model provides a blast furnace coal injection pipeline anti-backfire backstop which characterized in that, blast furnace coal injection pipeline anti-backfire backstop includes: the valve comprises a valve body (2), wherein a first channel extending along the vertical direction is formed in the middle of the valve body (2), and an upper sealing interface body (4) and a lower sealing interface body (1) which are connected with the first channel are respectively arranged at the upper end and the lower end of the valve body (2);
be provided with diameter in the first passageway with the same sealed spheroid (3) of first passageway internal diameter, sealed spheroid (3) can be located slide from top to bottom in the first passageway, the side of valve body (2) is formed with the second passageway that extends towards oblique top direction, the one end of second passageway is the same as the first passageway, and the other end is provided with coal gun interface (5).
2. The blast furnace coal injection pipeline anti-backfire backstop according to claim 1, characterized in that the inner diameter of the first channel is larger than the inner diameter of the second channel, and the inner diameter of the second channel is the same as the inner diameter of the lower sealing interface body (1).
3. The blast furnace coal injection pipeline anti-backfire backstop according to claim 2, characterized in that the inner diameter of the upper sealing interface body (4) is smaller than the inner diameter of the second channel.
4. The blast furnace coal injection pipeline anti-backfire backstop according to claim 3, wherein one ends of the upper sealing interface body (4) and the lower sealing interface body (1) facing the first channel are both provided with spherical surfaces attached to the sealing ball bodies (3).
5. The blast furnace coal injection pipeline anti-backfire backstop as recited in claim 1, wherein an angle between said second channel and said first channel is 25-35 °.
6. The blast furnace coal injection pipeline anti-backfire backstop according to any one of claims 1-5, characterized in that the valve body (2), the sealing ball body (3), the coal gun interface (5), the upper sealing interface body (4) and the lower sealing interface body (1) have high temperature resistance and wear resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200399.3A CN111350854A (en) | 2020-03-20 | 2020-03-20 | Blast furnace coal injection pipeline backfire-proof backstop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200399.3A CN111350854A (en) | 2020-03-20 | 2020-03-20 | Blast furnace coal injection pipeline backfire-proof backstop |
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| CN111350854A true CN111350854A (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010200399.3A Pending CN111350854A (en) | 2020-03-20 | 2020-03-20 | Blast furnace coal injection pipeline backfire-proof backstop |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962742A (en) * | 2022-04-26 | 2022-08-30 | 秦皇岛天沐冶金机械设备制造有限公司 | Coal injection backfire-proof device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0962701A2 (en) * | 1998-06-05 | 1999-12-08 | Willi Skoberne | Back draught safety device for fluegas systems |
| CN201343759Y (en) * | 2008-12-24 | 2009-11-11 | 广东联塑科技实业有限公司 | Self-sealing floor drain |
| CN104835682A (en) * | 2015-04-01 | 2015-08-12 | 段胜 | Electric switch inverted valve |
| CN204985874U (en) * | 2015-08-31 | 2016-01-20 | 缪毅 | Prevent simple and easy check valve that extra income flows backward |
| CN207005367U (en) * | 2017-06-28 | 2018-02-13 | 河南龙宇能源股份有限公司 | Unpowered pipeline check dropping equipment with pressure gauge |
| CN109268543A (en) * | 2018-11-23 | 2019-01-25 | 雷纳德流体智能科技江苏股份有限公司 | A kind of horizontal check valve |
| CN110724779A (en) * | 2019-12-04 | 2020-01-24 | 秦皇岛天沐冶金机械设备制造有限公司 | Blast furnace ironmaking coal powder spray gun check valve and check method |
-
2020
- 2020-03-20 CN CN202010200399.3A patent/CN111350854A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0962701A2 (en) * | 1998-06-05 | 1999-12-08 | Willi Skoberne | Back draught safety device for fluegas systems |
| CN201343759Y (en) * | 2008-12-24 | 2009-11-11 | 广东联塑科技实业有限公司 | Self-sealing floor drain |
| CN104835682A (en) * | 2015-04-01 | 2015-08-12 | 段胜 | Electric switch inverted valve |
| CN204985874U (en) * | 2015-08-31 | 2016-01-20 | 缪毅 | Prevent simple and easy check valve that extra income flows backward |
| CN207005367U (en) * | 2017-06-28 | 2018-02-13 | 河南龙宇能源股份有限公司 | Unpowered pipeline check dropping equipment with pressure gauge |
| CN109268543A (en) * | 2018-11-23 | 2019-01-25 | 雷纳德流体智能科技江苏股份有限公司 | A kind of horizontal check valve |
| CN110724779A (en) * | 2019-12-04 | 2020-01-24 | 秦皇岛天沐冶金机械设备制造有限公司 | Blast furnace ironmaking coal powder spray gun check valve and check method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962742A (en) * | 2022-04-26 | 2022-08-30 | 秦皇岛天沐冶金机械设备制造有限公司 | Coal injection backfire-proof device |
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Application publication date: 20200630 |
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