CN115962420A - Gas leakage prevention system of gas heating furnace matched with hydrogen-rich carbon circulating blast furnace - Google Patents
Gas leakage prevention system of gas heating furnace matched with hydrogen-rich carbon circulating blast furnace Download PDFInfo
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- CN115962420A CN115962420A CN202211654653.2A CN202211654653A CN115962420A CN 115962420 A CN115962420 A CN 115962420A CN 202211654653 A CN202211654653 A CN 202211654653A CN 115962420 A CN115962420 A CN 115962420A
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Abstract
The invention discloses a gas leakage prevention system of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which is used for the gas heating furnace matched with the hydrogen-carbon-rich circulating iron-making blast furnace, wherein the gas heating furnace is connected with a cold gas pipe, a hot gas pipe, a furnace gas pipe, a combustion-supporting air pipe and a flue gas pipe, and comprises the following components: the valve purging nitrogen main pipe is used for purging nitrogen to the valve rod cavity and the valve plate cavity so as to seal the positions of a valve rod and a valve plate of the valve; the first pipeline purging nitrogen pipe is connected to the cold gas pipe and the hot gas pipe and used for purging nitrogen for the cold gas pipe and the hot gas pipe; and the second pipeline purging nitrogen pipe is connected to the flue gas pipe and used for purging nitrogen gas to the flue gas pipe. The system for preventing gas leakage of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace disclosed by the invention effectively avoids leakage of a valve and a pipeline and ensures safety.
Description
Technical Field
The invention relates to the technical field of a coal gas leakage prevention process of a coal gas heating furnace matched with a hydrogen-carbon-rich circulating iron-making blast furnace, in particular to a coal gas leakage prevention system of a coal gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace.
Background
The coal gas heating furnace matched with the hydrogen-carbon-rich circulating iron-making blast furnace is used for heating coal gas and sending the hot coal gas to a blast furnace tuyere through a hot coal gas pipeline system. Cold coal gas enters the coal gas heating furnace for heating through the main pipe and the branch pipe, a valve is arranged, and hot coal gas is delivered to an air port of the iron-making blast furnace after the coal gas heating furnace is heated.
The heating medium of the gas heating furnace is high explosive gas, the normal working pressure is 0.4 MPa-0.5 MPa, and the danger is large. The heating medium is an explosive gas, one of the important conditions for the explosion to occur is that the explosive meets air (oxygen) under uncontrolled conditions, so that an important measure to prevent the explosion is to prevent the explosive from coming into non-tissue contact with air (oxygen).
Therefore, how to prevent the explosion of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace is a technical problem which needs to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of this, the invention aims to provide a system for preventing gas leakage of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, so as to prevent the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace from exploding.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a supporting coal gas heating furnace of hydrogen-rich carbon circulation blast furnace prevents gas leakage system for the supporting coal gas heating furnace of hydrogen-rich carbon circulation ironmaking blast furnace, the coal gas heating furnace is connected with cold gas pipe, hot gas pipe, burns stove gas pipe, combustion air pipe and flue gas pipe, its characterized in that includes:
the valves on the cold gas pipe, the furnace gas burning pipe, the combustion air pipe and the flue gas pipe are all provided with a valve rod cavity and a valve plate cavity, and the valve purging nitrogen main pipe is used for purging nitrogen to the valve rod cavity and the valve plate cavity so as to seal the positions of a valve rod and a valve plate of the valve;
the first pipeline purging nitrogen pipe is communicated with the cold gas pipe and the hot gas pipe and is used for purging nitrogen for the cold gas pipe and the hot gas pipe;
and the second pipeline purging nitrogen pipe is communicated with the flue gas pipe and is used for purging nitrogen to the flue gas pipe.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, four valve purging nitrogen branch pipes connected in parallel are arranged on the valve purging nitrogen main pipe, and are respectively a first valve purging nitrogen branch pipe, a second valve purging nitrogen branch pipe, a third valve purging nitrogen branch pipe and a fourth valve purging nitrogen branch pipe;
the valve on the cold gas pipe is a first hydraulic chemical double-gate valve, and the first valve purging nitrogen branch pipe is communicated with a valve rod cavity and a valve plate cavity of the first hydraulic chemical double-gate valve;
the valve on the flue gas pipe is a second hydraulic chemical engineering double-gate valve, and the second valve purging nitrogen branch pipe is communicated with a valve rod cavity and a valve plate cavity of the second hydraulic chemical engineering double-gate valve;
the valve on the combustion-supporting air pipe is a hydraulic combustion-supporting air combustion valve, and the third valve purging nitrogen branch pipe is communicated with a valve rod cavity and a valve plate cavity of the hydraulic combustion-supporting air combustion valve;
the valve on the burning furnace gas pipe is a hydraulic burning furnace gas combustion valve, and the fourth valve purging nitrogen branch pipe is communicated with a valve rod cavity and a valve plate cavity of the hydraulic burning furnace gas combustion valve.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, the hot gas pipe is provided with a first hot gas mixing valve and a second hot gas mixing valve, and the second hot gas mixing valve is located at the upstream of the first hot gas mixing valve.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with a hydrogen-rich carbon circulating blast furnace, the first pipeline purging nitrogen pipe comprises a first pipeline purging nitrogen branch pipe and a second pipeline purging nitrogen branch pipe which are connected in parallel;
the cold gas pipe is provided with a hydraulic cut-off butterfly valve and a cold gas purging and diffusing gas pipe, the hydraulic cut-off butterfly valve is arranged at the downstream of the first hydraulic chemical double-gate valve, and the first pipeline purging nitrogen branch pipe is connected to the cold gas pipe and is positioned between the first hydraulic chemical double-gate valve and the hydraulic cut-off butterfly valve; one end of the cold gas purging and diffusing gas pipe is connected to the cold gas pipe and located between the first hydraulic chemical double-gate valve and the first pipeline purging nitrogen branch pipe, and the other end of the cold gas purging and diffusing gas pipe is used for discharging cold gas; a diffusion manual ball valve and a diffusion pneumatic ball valve are sequentially arranged on the cold gas purging diffusion gas pipe along the flowing direction of the gas flow;
the second pipeline purging nitrogen branch pipe is connected to the hot gas pipe and located between the first hot gas mixing valve and the second hot gas mixing valve, the hot gas pipe is connected with a hot gas valve diffusing pipe, and the hot gas valve diffusing pipe is connected between the first hot gas mixing valve and the second pipeline purging nitrogen branch pipe.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-carbon-rich circulation blast furnace, the first hot gas mixing valve is in a single-side sealing form, and the other side of the first hot gas mixing valve is in a compression sealing form with a wedge block;
the second hot gas mixing valve adopts a double-sided sealing mode.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, a first manual ball valve, a first check valve, a first pneumatic valve and a second manual ball valve are sequentially arranged on the valve nitrogen purging branch pipe along the flow direction of the gas flow;
a third manual ball valve, a second check valve, a second pneumatic valve and a fourth manual ball valve are sequentially arranged on the first pipeline purging nitrogen branch pipe along the airflow flowing direction;
and a fifth manual ball valve, a third check valve, a third pneumatic valve and a sixth manual ball valve are sequentially arranged on the second pipeline purging nitrogen branch pipe along the airflow flowing direction.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, the second pipeline purging nitrogen pipe includes a third pipeline purging nitrogen branch pipe and a fourth pipeline purging nitrogen branch pipe which are connected in parallel;
a third pipeline purging nitrogen branch pipe is connected to the flue gas pipe and located at the upstream of the second hydraulic chemical engineering double-gate valve, and a seventh manual ball valve, a fourth check valve, a fourth pneumatic valve and an eighth manual ball valve are sequentially arranged on the third pipeline purging nitrogen branch pipe along the nitrogen flow direction;
flue gas pipe intercommunication sweeps in the flue gas and diffuses the trachea, flue gas sweep diffuse trachea one end connect in just be located on the flue gas pipe the second pipeline sweeps the upper reaches of nitrogen gas pipe, and the other end is used for the exhaust waste gas, the fourth pipeline sweep nitrogen gas branch connect in on the flue gas sweeps diffuse trachea, and be provided with ninth manual ball valve.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, the flue gas purging and diffusing pipe is sequentially provided with a hydraulic waste gas ball valve and a pneumatic waste gas regulating valve along the flow direction of the gas flow, and the fourth pipeline purging nitrogen branch pipe is located at the downstream of the pneumatic waste gas regulating valve.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, a carbon monoxide concentration detection device is arranged on the gas pipe of the furnace.
Optionally, in the above system for preventing gas leakage of a gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, an oxygen concentration detection device is arranged on the combustion air pipe.
The invention discloses a gas leakage prevention system of a gas heating furnace matched with a hydrogen-rich carbon circulating blast furnace, which comprises a valve purging nitrogen main pipe, a first pipeline purging nitrogen pipe and a second pipeline purging nitrogen pipe, and is used for the gas heating furnace matched with the hydrogen-rich carbon circulating iron-making blast furnace, wherein the gas heating furnace is connected with a cold gas pipe, a hot gas pipe, a furnace gas pipe, a combustion-supporting air pipe and a flue gas pipe. The valves arranged on the cold gas pipe, the furnace gas pipe, the combustion air pipe and the flue gas pipe are provided with a valve rod cavity and a valve plate cavity, and when the valves are closed, the valve purging nitrogen main pipe purges nitrogen to the valve rod cavity and the valve plate cavity so as to seal the positions of the valve rod and the valve plate of the valve. The first pipeline purging nitrogen pipe purges nitrogen for the cold gas pipe and the hot gas pipe, so that gas in the pipeline is prevented from leaking; the second pipeline purging nitrogen pipe purges nitrogen for the flue gas pipe, so that the residual gas in the flue gas pipe is prevented from entering the gas heating furnace to cause explosion during the conversion of different working processes of the gas heating furnace. The system for preventing gas leakage of the hydrogen-rich carbon circulating blast furnace matched with the gas heating furnace effectively prevents gas leakage of the valve and the pipeline and ensures the safety of the gas heating furnace in the working process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a gas leakage prevention system of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace disclosed by the embodiment of the invention.
The various reference numerals in fig. 1 have the following meanings:
100 is a gas heating furnace, 110 is a cold gas pipe, 111 is a first hydraulic chemical double gate valve, 112 is a hydraulic cutting butterfly valve, 120 is a hot gas pipe, 121 is a first hot gas mixing valve, 122 is a second hot gas mixing valve, 130 is a furnace burning gas pipe, 131 is a hydraulic furnace burning gas combustion valve, 132 is a carbon monoxide concentration detection device, 140 is a combustion air pipe, 141 is a hydraulic combustion air combustion valve, 142 is an oxygen concentration detection device, 150 is a flue gas pipe, and 151 is a second hydraulic chemical double gate valve;
200 is a main valve purging nitrogen pipe, 210 is a first valve purging nitrogen branch pipe, 220 is a second valve purging nitrogen branch pipe, 221 is a first manual ball valve, 222 is a first check valve, 223 is a first pneumatic valve, 224 is a second manual ball valve, 230 is a third valve purging nitrogen branch pipe, and 240 is a fourth valve purging nitrogen branch pipe;
300 is a first pipeline purging nitrogen pipe, 310 is a first pipeline purging nitrogen branch pipe, 311 is a third manual ball valve, 312 is a second check valve, 313 is a second pneumatic valve, 314 is a fourth manual ball valve, 320 is a second pipeline purging nitrogen branch pipe, 321 is a fifth manual ball valve, 322 is a third check valve, 323 is a third pneumatic valve, and 324 is a six-manual ball valve;
400 is a second pipeline purging nitrogen pipe, 410 is a third pipeline purging nitrogen branch pipe, 411 is a seventh manual ball valve, 412 is a fourth check valve, 413 is a fourth pneumatic valve, 414 is an eighth manual ball valve, 420 is a fourth pipeline purging nitrogen branch pipe, and 421 is a ninth manual ball valve;
510 is a cold gas purging and diffusing pipe, 511 is a diffusing manual ball valve, 512 is a diffusing pneumatic ball valve, 520 is a hot gas valve diffusing pipe, 521 is a fourth manual ball valve, 522 is a hydraulic ball valve, 530 is a flue gas purging and diffusing pipe, 531 is a hydraulic waste gas ball valve, and 532 is a pneumatic waste gas regulating valve.
Detailed Description
The core of the invention is to provide a gas leakage prevention system of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which prevents the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace from exploding.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment of the invention discloses a gas leakage prevention system for a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which is used in the gas heating furnace 100 matched with the hydrogen-carbon-rich circulating iron-making blast furnace and comprises a valve purging nitrogen main pipe 200, a first pipeline purging nitrogen pipe 300 and a second pipeline purging nitrogen pipe 400.
The gas heating furnace 100 is connected to a cold gas pipe 110, a hot gas pipe 120, a furnace gas pipe 130, a combustion air pipe 140, and a flue gas pipe 150. The gas heating furnace 100 has three working processes, including a furnace burning process, a furnace closing process and a gas heating process, wherein the furnace burning process means that combustion-supporting air conveyed by a combustion-supporting air pipe 140 and furnace burning gas conveyed by a furnace burning gas pipe 130 respectively enter the gas heating furnace 100, the combustion-supporting air and the furnace burning gas are mixed in the gas heating furnace 100 and then are combusted, generated high-temperature flue gas heats lattice bricks in the gas heating furnace 100, and simultaneously generated waste gas is discharged into a chimney through a flue gas pipe 150; the furnace-closing process refers to a transition stop state between the furnace burning process and the gas heating process; the gas heating process means that cold gas conveyed by the cold gas pipe 110 enters the gas heating furnace 100, the checker bricks heat the cold gas, the cold gas is changed into hot gas after being heated, the hot gas is sent into the hydrogen-rich carbon circulating blast furnace through the hot gas pipe 120, and the three working processes are alternately and repeatedly carried out in a reciprocating manner. In actual operation, the number of the gas heating furnaces 100 is usually set to be plural, and plural gas heating furnaces 100 are alternately operated, and for convenience of explanation, an example in which a single gas heating furnace 100 is provided will be described below.
The valves on the cold gas pipe 110, the burner gas pipe 130, the combustion air pipe 140 and the flue gas pipe 150 all have a valve rod cavity and a valve plate cavity, and when the valves are in a closed state, the valve purging nitrogen main pipe 200 is used for purging nitrogen to the valve rod cavity and the valve plate cavity of the valves so as to seal the positions of the valve rods and the valve plates of the valves and prevent gas leakage. When the valve is in the open state, the valve purge nitrogen main 200 is closed.
The first pipeline purging nitrogen pipe 300 is connected to the cold gas pipe 110 and the hot gas pipe 120 and used for purging nitrogen gas from the cold gas pipe 110 and the hot gas pipe 120, and before the gas heating furnace 100 enters a gas heating process, the first pipeline purging nitrogen pipe 300 purges the cold gas pipe 110 and the hot gas pipe 120 to prevent residual oxygen in the pipes from contacting with gas to cause explosion; the second pipeline purging nitrogen pipe 400 is connected to the flue gas pipe 150, and before the gas heating furnace 100 enters the furnace burning process and the gas heating process, the second pipeline purging nitrogen pipe 400 purges nitrogen gas to the flue gas pipe 150, so that the nitrogen gas environment is maintained in the flue gas pipe 150, and gas explosion is prevented.
It will be understood by those skilled in the art that the valve purging nitrogen main 200, the first pipeline purging nitrogen pipe 300 and the second pipeline purging nitrogen pipe 400 may be from the same nitrogen main, which is connected to a nitrogen source, which may be a nitrogen tank.
The embodiment of the invention discloses a gas leakage prevention system of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which comprises a valve purging nitrogen main pipe 200, a first pipeline purging nitrogen pipe 300 and a second pipeline purging nitrogen pipe 400, and is used for the gas heating furnace matched with the hydrogen-carbon-rich circulating iron-making blast furnace, wherein the gas heating furnace 100 is connected with a cold gas pipe 110, a hot gas pipe 120, a furnace gas pipe 130, a combustion air pipe 140 and a flue gas pipe 150. The valves arranged on the cold gas pipe 110, the burner gas pipe 130, the combustion air pipe 140 and the flue gas pipe 150 are all provided with a valve rod cavity and a valve plate cavity, and when the valves are closed, the valve purging nitrogen main pipe 200 purges nitrogen for the valve rod cavity and the valve plate cavity so as to seal the positions of the valve rod and the valve plate of the valves and prevent gas leakage; the first pipeline purging nitrogen pipe 300 purges nitrogen for the cold gas pipe 110 and the hot gas pipe 120, so that gas leakage is prevented; the second pipeline purging nitrogen pipe 400 purges nitrogen gas to the flue gas pipe 150, and prevents residual gas in the flue gas pipe 150 from entering the gas heating furnace 100 to cause explosion during the conversion of different working processes of the gas heating furnace 100. The gas leakage prevention system for the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace disclosed by the embodiment of the invention effectively prevents gas leakage of a valve and a pipeline and ensures the safety of the gas heating furnace 100 in the working process.
In an embodiment of the present invention, four parallel valve purging nitrogen branch pipes, namely a first valve purging nitrogen branch pipe 210, a second valve purging nitrogen branch pipe 220, a third valve purging nitrogen branch pipe 230, and a fourth valve purging nitrogen branch pipe 240, are disposed on the valve purging nitrogen main pipe 200. The valve on the cold gas pipe 110 is a first hydraulic chemical double-gate valve 111, and the first valve purging nitrogen branch pipe 210 is communicated with the first hydraulic chemical double-gate valve 111; a valve on the flue gas pipe 150 is a second hydraulic chemical engineering double-gate valve 151, and the second valve purging nitrogen branch pipe 220 is communicated with the second hydraulic chemical engineering double-gate valve 151; the valve on the combustion-supporting air pipe 140 is a hydraulic combustion-supporting air combustion valve 141, and the third valve purging nitrogen branch pipe 230 is communicated with the hydraulic combustion-supporting air combustion valve 141; the valve on the burning furnace gas pipe 130 is a hydraulic burning furnace gas combustion valve 131, and the fourth valve purging nitrogen branch pipe 240 is communicated with the hydraulic burning furnace gas combustion valve 131. The four valve purging nitrogen branch pipes are connected in parallel and are opened when the valve is closed, and nitrogen purging is performed on a valve rod cavity and a valve plate cavity of the valve, so that the positions of a valve rod and a valve plate of the valve are sealed, and gas in a pipeline is prevented from leaking through the valve.
When the gas heating furnace 100 is in a furnace burning process, the first hydraulic chemical double-gate valve 111 is in a closed state, the first valve purging nitrogen branch pipe 210 is opened, and nitrogen is purged to the first hydraulic chemical double-gate valve 111; when the gas heating furnace 100 is in a gas heating process, the second hydraulic chemical engineering double-gate valve 151, the hydraulic combustion-supporting air combustion valve 141 and the hydraulic furnace gas combustion valve 131 are in a closed state, the second valve purging nitrogen branch pipe 220, the third valve purging nitrogen branch pipe 230 and the fourth valve purging nitrogen branch pipe 240 are opened, and nitrogen is purged to the valves, so that the valve rod cavity and the valve plate cavity are sealed, and gas leakage is prevented.
It should be noted that the first hydraulic chemical double-gate valve 111, the second hydraulic chemical double-gate valve 151, the hydraulic combustion-supporting air combustion valve 141 and the hydraulic furnace gas combustion valve 131 are double-gate chemical valves, the sealing form of the gate and the valve body is more reliable due to the arrangement of the double gates, the valve rod cavity and the valve plate cavity of the valve are sealed by nitrogen, and the high sealing performance of the valve is ensured by double leakage prevention measures, so that gas leakage is prevented.
In order to prevent the hot gas in the hot gas pipe 120 from leaking, in an embodiment of the present invention, the hot gas pipe 120 is provided with a first hot gas mixing valve 121 and a second hot gas mixing valve 122, wherein the second hot gas mixing valve 122 is located upstream of the first hot gas mixing valve 121, i.e., along a flow direction of the hot gas, the hot gas first flows through the second hot gas mixing valve 122 and then flows through the first hot gas mixing valve 121. The first hot gas mixing valve 121 and the second hot gas mixing valve 122 both have a turn-off function, the sealing effect of the valves is enhanced due to the arrangement of the two valves, a double-layer safety function is achieved, and gas leakage is effectively prevented.
In an embodiment of the present invention, the first pipeline purge nitrogen gas pipe 300 includes two pipeline purge nitrogen gas branch pipes connected in parallel, which are a first pipeline purge nitrogen gas branch pipe 310 and a second pipeline purge nitrogen gas branch pipe 320, respectively. Be provided with hydraulic pressure on the cold gas pipe 110 and cut off butterfly valve 112, hydraulic pressure cuts off butterfly valve 112 and sets up in the low reaches of first hydraulic chemical industry double gate valve 111, and first pipeline sweeps nitrogen gas branch pipe 310 and connects on cold gas pipe 110 and be located between first hydraulic chemical industry double gate valve 111 and the hydraulic pressure and cut off butterfly valve 112.
One end of the cold gas purging and diffusing pipe 510 is communicated with the cold gas pipe 110, the connection point is located between the first hydraulic chemical double gate valve 111 and the first pipeline purging nitrogen branch pipe 310, and the other end is used for discharging cold gas. When the hydraulic cutoff butterfly valve 112 and the first hydraulic chemical double-gate valve 111 are in a closed state and need to be opened, for example, when the gas heating furnace 100 is switched from a furnace burning process to a gas heating process, the first pipeline is opened to purge the nitrogen branch pipe 310, nitrogen purging is performed on the cold gas pipe 110 between the hydraulic cutoff butterfly valve 112 and the first hydraulic chemical double-gate valve 111, and waste gas is discharged through the cold gas purging and discharging pipe 510. In order to control the opening and closing of the cold gas purging and dissipating gas pipe 510, a manual dissipating ball valve 511 and a pneumatic dissipating ball valve 512 are sequentially arranged on the cold gas purging and dissipating gas pipe 510 along the flowing direction of the gas flow.
The second pipeline purging nitrogen branch pipe 320 is communicated with the hot gas pipe 120 and is positioned between the first hot gas mixing valve 121 and the second hot gas mixing valve 122, a hot gas valve diffusing pipe 520 is arranged on the hot gas pipe 120, and the hot gas valve diffusing pipe 520 is connected between the first hot gas mixing valve 121 and the second pipeline purging nitrogen branch pipe 320. When the first hot gas mixing valve 121 and the second hot gas mixing valve 122 are in a closed state and need to be opened, for example, when the gas heating furnace 100 is switched from a furnace burning process to a gas heating process, the second pipeline purging nitrogen branch pipe 320 is opened, nitrogen purging is performed on the hot gas pipe 120 between the first hot gas mixing valve 121 and the second hot gas mixing valve 122, and waste gas is discharged through the hot gas valve discharging pipe 520.
In order to further ensure the sealing performance of the first hot gas mixing valve 121 and the second hot gas mixing valve 122, in a specific embodiment of the present invention, the first hot gas mixing valve 121 is in a form of single-sided sealing, and the other side is in a form of compression sealing with a wedge block, wherein the wedge block can be abutted against a valve plate of the first hot gas mixing valve 121 to perform a better sealing function; the second hot gas mixing valve 122 is in a double-sided sealing mode, and as long as a differential pressure exists between gases on two sides of the second hot gas mixing valve 122, the second hot gas mixing valve 122 can play a sealing role.
In an embodiment of the present invention, the valve purging nitrogen branch pipe is sequentially provided with a first manual ball valve 221, a first check valve 222, a first pneumatic valve 223, and a second manual ball valve 224 along the flow direction of the gas flow. Wherein, manual ball valve plays the turn-off action, can manual control valve sweep the opening and close of nitrogen gas branch pipe, and first check valve 222 prevents that the gas in the pipeline from flowing backwards into valve and sweeps nitrogen gas branch pipe, and first pneumatic valve 223 plays the effect of adjusting nitrogen gas flow. It should be noted that the four valves purge the same type of valves arranged in the flow direction of the gas flow in the nitrogen branch pipe.
A third manual ball valve 311, a second check valve 312, a second pneumatic valve 313 and a fourth manual ball valve 314 are sequentially arranged on the first pipeline nitrogen purging branch pipe 310 along the flow direction of the air flow; the second pipeline nitrogen purging branch pipe 320 is provided with a fifth manual ball valve 321, a third check valve 322, a third pneumatic valve 323 and a sixth manual ball valve 324 in sequence along the flow direction of the gas flow.
In an embodiment of the present invention, the second pipeline nitrogen purge pipe 400 includes a third pipeline nitrogen purge branch pipe 410 and a fourth pipeline nitrogen purge branch pipe 420 connected in parallel. The third pipeline purging nitrogen branch pipe 410 is communicated with the flue gas pipe 150 and is located at the upstream of the second hydraulic chemical engineering double-gate valve 151, and a seventh manual ball valve 411, a fourth check valve 412, a fourth pneumatic valve 413 and an eighth manual ball valve 414 are sequentially arranged on the third pipeline purging nitrogen branch pipe 410 along the nitrogen flow direction.
The flue gas pipe 150 is communicated with the flue gas purging and diffusing gas pipe 530, one end of the fourth pipeline purging nitrogen branch pipe 420 is communicated with the flue gas pipe 150, the connecting point of the fourth pipeline purging nitrogen branch pipe is located at the upstream of the second pipeline purging nitrogen pipe 400, the other end of the fourth pipeline purging nitrogen branch pipe is used for discharging waste gas, the fourth pipeline purging nitrogen branch pipe 420 is communicated with the flue gas purging and diffusing gas pipe 530, and the fourth pipeline purging nitrogen branch pipe 420 is provided with a ninth manual ball valve 421 used for controlling the opening and closing of the fourth pipeline purging nitrogen branch pipe 420. Before the second hydraulic chemical double-gate valve 151 needs to be opened, for example, before the gas heating furnace 100 enters the furnace burning process and before the gas heating process, the fourth pipeline is opened to purge the nitrogen branch pipe 420, nitrogen purging is performed on the flue gas pipe 150, and the waste gas is diffused and discharged through the flue gas purging and diffusing pipe 530. Before the flue gas pipe 150 is purged, a valve on the flue gas purging and diffusing pipe 530 is closed, a ninth manual ball valve 421 on the fourth pipeline purging and nitrogen branch pipe 420 is opened, nitrogen purging is performed on the flue gas purging and diffusing pipe 530, and waste gas is diffused and discharged, so that the waste gas in the flue gas pipe 150 and the waste gas in the flue gas purging and diffusing pipe 530 are prevented from contacting and exploding.
As shown in fig. 1, in addition to the above embodiment, a hydraulic waste gas ball valve 531 and a pneumatic waste gas regulating valve 532 are sequentially arranged on the flue gas purging and diffusing pipe 530 along the flow direction of the gas flow, the fourth pipeline purging nitrogen branch pipe 420 is located downstream of the pneumatic waste gas regulating valve 532, and when the flue gas purging and diffusing pipe 530 is purged with nitrogen gas, the hydraulic waste gas ball valve 531 and the pneumatic waste gas regulating valve 532 are closed.
In the system for preventing gas leakage of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace disclosed by the embodiment of the invention, the gas pipe 130 of the furnace is provided with a carbon monoxide concentration detection device 132 for monitoring the concentration of carbon monoxide.
In the system for preventing gas leakage of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace disclosed by the embodiment of the invention, the combustion air pipe 140 is provided with the oxygen concentration detection device 142 for monitoring the concentration of oxygen.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements. An element defined by the phrase "comprising a … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a supporting coal gas heating furnace of hydrogen-rich carbon circulation blast furnace prevents gas leakage system for supporting coal gas heating furnace (100) of hydrogen-rich carbon circulation ironmaking blast furnace, coal gas heating furnace (100) are connected with cold gas pipe (110), hot gas pipe (120), burn stove gas pipe (130), combustion air pipe (140) and flue gas pipe (150), its characterized in that includes:
the valves on the cold gas pipe (110), the furnace gas pipe (130), the combustion air pipe (140) and the flue gas pipe (150) are provided with a valve rod cavity and a valve plate cavity, and the valve purging nitrogen main pipe (200) is used for purging nitrogen to the valve rod cavity and the valve plate cavity so as to seal the positions of a valve rod and a valve plate of the valve;
the first pipeline purging nitrogen pipe (300) is communicated with the cold gas pipe (110) and the hot gas pipe (120) and is used for purging nitrogen gas from the cold gas pipe (110) and the hot gas pipe (120);
and the second pipeline purging nitrogen pipe (400) is communicated with the flue gas pipe (150) and is used for purging nitrogen gas in the flue gas pipe (150).
2. The system for preventing gas leakage of the hydrogen-rich carbon circulation blast furnace supporting gas heating furnace according to claim 1, wherein four valve purging nitrogen branch pipes connected in parallel are arranged on the valve purging nitrogen main pipe (200), and are respectively a first valve purging nitrogen branch pipe (210), a second valve purging nitrogen branch pipe (220), a third valve purging nitrogen branch pipe (230) and a fourth valve purging nitrogen branch pipe (240);
the valve on the cold gas pipe (110) is a first hydraulic chemical double-gate valve (111), and the first valve purging nitrogen branch pipe (210) is communicated with a valve rod cavity and a valve plate cavity of the first hydraulic chemical double-gate valve (111);
a valve on the flue gas pipe (150) is a second hydraulic chemical engineering double-gate valve (151), and the second valve purging nitrogen branch pipe (220) is communicated with a valve rod cavity and a valve plate cavity of the second hydraulic chemical engineering double-gate valve (151);
the valve on the combustion-supporting air pipe (140) is a hydraulic combustion-supporting air combustion valve (141), and the third valve purging nitrogen branch pipe (230) is communicated with a valve rod cavity and a valve plate cavity of the hydraulic combustion-supporting air combustion valve (141);
the valve on the furnace burning gas pipe (130) is a hydraulic furnace burning gas combustion valve (131), and the fourth valve purging nitrogen branch pipe (240) is communicated with a valve rod cavity and a valve plate cavity of the hydraulic furnace burning gas combustion valve (131).
3. The gas leakage prevention system for the hydrogen-rich carbon circulation blast furnace supporting gas heating furnace according to claim 2, wherein a first hot gas mixing valve (121) and a second hot gas mixing valve (122) are provided on the hot gas pipe (120), and the second hot gas mixing valve (122) is located upstream of the first hot gas mixing valve (121).
4. The gas leakage prevention system for a hydrogen-carbon rich circulation blast furnace supporting gas heating furnace according to claim 3, wherein said first pipeline purge nitrogen line (300) comprises a first pipeline purge nitrogen branch line (310) and a second pipeline purge nitrogen branch line (320) connected in parallel;
a hydraulic cut-off butterfly valve (112) and a cold gas purging and diffusing gas pipe (510) are arranged on the cold gas pipe (110), the hydraulic cut-off butterfly valve (112) is arranged at the downstream of the first hydraulic chemical double-gate valve (111), and the first pipeline purging nitrogen branch pipe (310) is communicated with the cold gas pipe (110) and is positioned between the first hydraulic chemical double-gate valve (111) and the hydraulic cut-off butterfly valve (112); one end of the cold gas purging and diffusing pipe (510) is connected to the cold gas pipe (110) and is located between the first hydraulic chemical double-gate valve (111) and the first pipeline purging nitrogen branch pipe (310), and the other end of the cold gas purging and diffusing pipe is used for discharging cold gas; a diffusion manual ball valve (511) and a diffusion pneumatic ball valve (512) are sequentially arranged on the cold gas purging diffusion gas pipe (510) along the gas flow direction;
the second pipeline purging nitrogen branch pipe (320) is communicated with the hot gas pipe (120) and is located between the first hot gas mixing valve (121) and the second hot gas mixing valve (122), a hot gas valve discharging pipe (520) is connected to the hot gas pipe (120), and the hot gas valve discharging pipe (520) is connected between the first hot gas mixing valve (121) and the second pipeline purging nitrogen branch pipe (320).
5. The gas leakage prevention system for the hydrogen-rich carbon circulation blast furnace supporting gas heating furnace according to claim 4, wherein the first hot gas mixing valve (121) is in a single-face sealing form, and the other face is in a compression sealing form with a wedge block;
the second hot gas mixing valve (122) is in a double-sided sealing form.
6. The gas leakage prevention system for the matched gas heating furnace of the hydrogen-rich carbon circulation blast furnace as set forth in claim 4, wherein the valve purging nitrogen branch pipe is provided with a first manual ball valve (221), a first check valve (222), a first pneumatic valve (223) and a second manual ball valve (224) in sequence along the flow direction of the gas flow;
a third manual ball valve (311), a second check valve (312), a second pneumatic valve (313) and a fourth manual ball valve (314) are sequentially arranged on the first pipeline purging nitrogen branch pipe (310) along the airflow flowing direction;
and a fifth manual ball valve (321), a third check valve (322), a third pneumatic valve (323) and a sixth manual ball valve (324) are sequentially arranged on the second pipeline purging nitrogen branch pipe (320) along the airflow flowing direction.
7. The gas leakage prevention system for a hydrogen-carbon rich circulation blast furnace supporting gas heating furnace as claimed in claim 2, wherein said second line purging nitrogen gas pipe (400) comprises a third line purging nitrogen gas branch pipe (410) and a fourth line purging nitrogen gas branch pipe (420) connected in parallel;
a third pipeline purging nitrogen branch pipe (410) is communicated with the flue gas pipe (150) and is positioned at the upstream of the second hydraulic chemical double-gate valve (151), and a seventh manual ball valve (411), a fourth check valve (412), a fourth pneumatic valve (413) and an eighth manual ball valve (414) are sequentially arranged on the third pipeline purging nitrogen branch pipe (410) along the nitrogen flow direction;
flue gas pipe (150) communicate in flue gas purging gas pipe (530) that diffuses, flue gas purging gas pipe (530) one end connect in on flue gas pipe (150) and be located the second pipeline purges the upper reaches of nitrogen gas pipe (400), and the other end is used for discharging waste gas, the fourth pipeline purge nitrogen gas branch pipe (420) communicate in on flue gas purging gas pipe (530) that diffuses, and be provided with ninth manual ball valve (421).
8. The system for preventing gas leakage of a gas heating furnace matched with a hydrogen-rich carbon circulation blast furnace according to claim 7, wherein a hydraulic waste gas ball valve (531) and a pneumatic waste gas regulating valve (532) are sequentially arranged on the flue gas purging and diffusing gas pipe (530) along the flow direction of the gas flow, and the fourth pipeline purging nitrogen branch pipe (420) is positioned at the downstream of the pneumatic waste gas regulating valve (532).
9. The gas leakage prevention system for a hydrogen-rich carbon cycle blast furnace supporting gas heating furnace as claimed in any one of claims 1 to 8, wherein a carbon monoxide concentration detection device (132) is provided on said furnace gas pipe (130).
10. The system for preventing gas leakage of a gas heating furnace associated with a hydrogen-rich carbon recycling blast furnace according to any one of claims 1 to 8, wherein an oxygen concentration detecting device (142) is provided on the combustion air pipe (140).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211654653.2A CN115962420A (en) | 2022-12-22 | 2022-12-22 | Gas leakage prevention system of gas heating furnace matched with hydrogen-rich carbon circulating blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211654653.2A CN115962420A (en) | 2022-12-22 | 2022-12-22 | Gas leakage prevention system of gas heating furnace matched with hydrogen-rich carbon circulating blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115962420A true CN115962420A (en) | 2023-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211654653.2A Pending CN115962420A (en) | 2022-12-22 | 2022-12-22 | Gas leakage prevention system of gas heating furnace matched with hydrogen-rich carbon circulating blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115962420A (en) |
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2022
- 2022-12-22 CN CN202211654653.2A patent/CN115962420A/en active Pending
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