CN115786615A - Hydrogen-carbon-rich circulating blast furnace matched gas heating furnace - Google Patents
Hydrogen-carbon-rich circulating blast furnace matched gas heating furnace Download PDFInfo
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- CN115786615A CN115786615A CN202211654667.4A CN202211654667A CN115786615A CN 115786615 A CN115786615 A CN 115786615A CN 202211654667 A CN202211654667 A CN 202211654667A CN 115786615 A CN115786615 A CN 115786615A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 84
- 238000010438 heat treatment Methods 0.000 title claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 164
- 238000002485 combustion reaction Methods 0.000 claims abstract description 68
- 239000003034 coal gas Substances 0.000 claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003546 flue gas Substances 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 50
- 238000004880 explosion Methods 0.000 claims description 43
- 238000013022 venting Methods 0.000 claims description 29
- 239000011449 brick Substances 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 25
- 238000010926 purge Methods 0.000 claims description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 18
- 239000001257 hydrogen Substances 0.000 claims description 18
- 229910052739 hydrogen Inorganic materials 0.000 claims description 18
- 238000005338 heat storage Methods 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910001018 Cast iron Inorganic materials 0.000 claims description 5
- 238000004177 carbon cycle Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000002912 waste gas Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 26
- 229910002091 carbon monoxide Inorganic materials 0.000 description 10
- 239000003507 refrigerant Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
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- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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Abstract
The invention discloses a hydrogen-carbon-rich circulating blast furnace matched gas heating furnace, which comprises: the furnace body comprises a combustion chamber and a regenerative chamber, the upper part of the furnace body is provided with a burner, and the burner is provided with a furnace gas burning pipe and a combustion-supporting air pipe; the combustion chamber is arranged at the lower part of the combustor and communicated with the combustor, and is provided with a high-pressure hot gas pipe; the regenerator is arranged at the lower part of the combustion chamber and communicated with the combustion chamber, and the lower part of the regenerator is provided with a high-pressure cold gas pipe and a flue gas pipe; and the furnace shell is arranged outside the furnace body. The invention discloses a coal gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which heats high-pressure cold coal gas into high-pressure hot coal gas through a furnace burning process and a coal gas heating process, and sends the high-pressure hot coal gas to the hydrogen-carbon-rich circulating iron-making blast furnace, thereby reducing the carbon consumption of the hydrogen-carbon-rich circulating iron-making blast furnace and meeting the high-pressure hot coal gas requirement of the hydrogen-carbon-rich circulating iron-making blast furnace.
Description
Technical Field
The invention relates to the technical field of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, in particular to a gas heating furnace matched with the 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 hot coal gas to a blast furnace tuyere through a hot coal gas pipeline system. High-pressure cold coal gas enters a coal gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace for heating through a main pipe and a branch pipe, and is provided with a valve, and after the coal gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace is heated, the high-pressure hot coal gas is sent to a tuyere of the iron-making blast furnace.
In order to reduce the carbon consumption of the hydrogen-carbon-rich circulating ironmaking blast furnace, coal gas needs to be heated and blown into the hydrogen-carbon-rich circulating ironmaking blast furnace, most of the existing coal gas heating furnaces matched with the hydrogen-carbon-rich circulating blast furnace are tubular heating furnaces or electric heating furnaces, the heating capacity is limited, and the coal gas temperature required by the hydrogen-carbon-rich circulating ironmaking blast furnace cannot be met.
Therefore, how to develop a gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, which heats high-pressure cold gas into high-pressure hot gas and sends the high-pressure hot gas into the hydrogen-carbon-rich circulating iron-making blast furnace is a technical problem to be solved by technical personnel in the field at present.
Disclosure of Invention
In view of this, the invention aims to provide a coal gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which provides high-pressure hot coal gas for the hydrogen-carbon-rich circulating iron-making blast furnace.
In order to achieve the purpose, the invention provides the following technical scheme:
the furnace body comprises a combustion chamber and a regenerator, the upper part of the furnace body is provided with a burner, the burner is provided with a furnace gas burning pipe and a combustion-supporting air pipe, the furnace gas burning pipe is used for conveying furnace gas, and the combustion-supporting air pipe is used for conveying combustion-supporting air; the combustion chamber is arranged at the lower part of the combustor and communicated with the combustor, and is provided with a high-pressure hot gas pipe which is used for conveying high-pressure hot gas to the hydrogen-carbon-rich circulating iron-making blast furnace; the regenerative chamber is arranged at the lower part of the combustion chamber and is communicated with the combustion chamber, the lower part of the regenerative chamber is provided with a high-pressure cold gas pipe and a flue gas pipe, the high-pressure cold gas pipe is used for conveying high-pressure cold gas, and the flue gas pipe is used for discharging waste gas;
and the furnace shell is arranged outside the furnace body.
Optionally, in the above-mentioned hydrogen-rich carbon circulating blast furnace matching gas heating furnace, the combustion air pipe is arranged on the upper portion of the furnace gas pipe.
Optionally, in the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, a furnace gas burning loop is arranged on the burner, and the furnace gas burning pipe is communicated with the furnace gas burning loop;
and a combustion-supporting air loop is arranged on the combustor, and the combustion-supporting air pipe is communicated with the combustion-supporting air loop.
Optionally, in the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, a furnace gas pipe opening explosion venting device is arranged on the furnace gas pipe;
a combustion-supporting air pipe orifice explosion venting device is arranged on the combustion-supporting air pipe;
and a flue gas pipe orifice explosion venting device is arranged on the flue gas pipe.
Optionally, the hydrogen-carbon-rich circulating blast furnace is matched with a gas heating furnace, and the furnace further comprises a nitrogen purging device;
the furnace gas loop is connected with the nitrogen purging device;
the combustion air loop is connected with the nitrogen purging device;
and the vault of the burner is connected with the nitrogen purging device and is used for purging nitrogen in the furnace body.
Optionally, in the above-mentioned hydrogen-rich carbon cycle blast furnace supporting gas heating furnace, the regenerator includes:
the first regenerative chamber is arranged at the lower part of the combustion chamber and communicated with the combustion chamber;
and the second heat storage chamber is arranged at the lower part of the first heat storage chamber and is communicated with the first heat storage chamber.
Optionally, in the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace, the checker bricks adopted by the first regenerator are low-iron checker bricks with 37 holes and 20mm diameter;
and the checker bricks adopted by the second regenerative chamber are heat-resistant cast iron checker bricks.
Optionally, in the above coal gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, a steam pipe is connected to the lower part of the second regenerator, and a steam nozzle is arranged on the steam pipe and is arranged at an inlet of the high-pressure cold coal gas conveyed by the high-pressure cold coal gas pipe.
Optionally, in the above hydrogen-carbon-rich circulation blast furnace matching gas heating furnace, the steam pipe comprises a main steam pipe and a steam loop pipe;
one end of the steam main pipe is connected with a steam source, and the other end of the steam main pipe extends into the furnace body;
the steam ring pipe is connected with the main steam pipe, the steam ring pipe is arranged inside the furnace body, and the steam nozzle is arranged on the steam ring pipe.
Optionally, in the above-mentioned hydrogen-carbon-rich circulating blast furnace matching gas heating furnace, the burner is a ceramic burner.
The invention provides a hydrogen-carbon-rich circulating blast furnace coal gas mixing heating furnace, which comprises a furnace body and a furnace shell. The furnace body comprises a combustion chamber and a heat accumulation chamber, the upper part of the furnace body is provided with a burner, the combustion chamber is arranged at the lower part of the burner, the heat accumulation chamber is arranged at the lower part of the combustion chamber, the burner is communicated with the combustion chamber, and the combustion chamber is communicated with the heat accumulation chamber. The combustor is provided with a furnace burning gas pipe and a combustion-supporting air pipe, the furnace burning gas enters the combustor through the furnace burning gas pipe, the combustion-supporting air enters the combustor through the combustion-supporting air pipe, the furnace burning gas and the combustion-supporting air are mixed in the combustor and then enter the combustion chamber, the combustion is carried out in the combustion chamber, high-temperature flue gas generated by combustion flows through the regenerator from top to bottom to heat a heat accumulator in the regenerator, and then the flue gas after cooling flows out from a flue gas pipe arranged at the lower part of the regenerator, so that the process is called as a furnace burning process.
After the burning process is finished, after various indexes in the furnace body reach set values, high-pressure cold coal gas is introduced, the high-pressure cold coal gas enters the furnace body from a high-pressure cold coal gas pipe arranged at the lower part of the heat storage chamber, flows from bottom to top and passes through the heat storage chamber, the heat storage body in the heat storage chamber heats the high-pressure cold coal gas, so that the high-pressure cold coal gas is heated to become high-pressure hot coal gas, the high-pressure hot coal gas is sent into the hydrogen-carbon-rich circulating iron-making blast furnace through the high-pressure hot coal gas pipe arranged on the combustion chamber, and the process is called as a coal gas heating process.
According to the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, high-pressure cold gas is heated into high-pressure hot gas through the furnace burning process and the gas heating process, and the high-pressure hot gas is sent to the hydrogen-carbon-rich circulating iron-making blast furnace, so that the carbon consumption of the hydrogen-carbon-rich circulating iron-making blast furnace is reduced, and the high-pressure hot gas requirement of the hydrogen-carbon-rich circulating iron-making blast furnace is met.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a gas heating furnace matched with a hydrogen-rich carbon circulating blast furnace disclosed in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a furnace-burning gas loop of a gas heating furnace matched with a hydrogen-rich carbon circulating blast furnace disclosed in the embodiment of the invention;
FIG. 3 is a schematic structural diagram of a combustion air loop of a gas heating furnace matched with a hydrogen-rich carbon circulating blast furnace, disclosed by the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a steam pipe of a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace disclosed in the embodiment of the invention;
FIG. 5 is a schematic view of a self-locking structure of a refractory brick of a burner disclosed in an embodiment of the invention.
The meaning of the various reference numerals in figures 1 to 5 is as follows:
100 is a furnace body, 110 is a burner, 111 is a furnace burning gas loop, 112 is a combustion-supporting air loop, 113 is a burner refractory brick, 120 is a combustion chamber, 130 is a regenerator, 131 is a first regenerator, and 132 is a second regenerator;
200 is a furnace shell;
310 is a furnace gas burning pipe, 320 is a combustion air pipe, 330 is a high-pressure hot gas pipe, 340 is a high-pressure cold gas pipe, 350 is a flue gas pipe, 360 is a steam pipe, 361 is a steam main pipe, 362 is a steam ring pipe, and 363 is a steam nozzle;
410 is a furnace gas pipe orifice explosion venting device, 420 is a combustion air pipe orifice explosion venting device, and 430 is a flue gas pipe orifice explosion venting device.
Detailed Description
The core of the invention is to provide a coal gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace, which provides high-pressure hot coal gas for the hydrogen-carbon-rich circulating iron-making blast furnace.
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 heating furnace matched with a hydrogen-carbon-rich circulating blast furnace, which is used for providing high-pressure hot gas for the hydrogen-carbon-rich circulating iron-making blast furnace and comprises a furnace body 100 and a furnace shell 200.
The furnace body 100 includes a combustion chamber 120 and a regenerator 130. The burner 110 is disposed on the upper portion of the furnace body 100, and a furnace gas pipe 310 and a combustion air pipe 320 are disposed on the burner 110, wherein the furnace gas pipe 310 is used for conveying furnace gas, the combustion air pipe 320 is used for conveying combustion air, and the furnace gas and the combustion air enter the burner 110 and are mixed in the burner 110. The combustion chamber 120 is arranged at the lower part of the burner 110 and communicated with the burner 110, and the furnace gas and the combustion-supporting air are mixed in the burner 110 and then enter the combustion chamber 120 for combustion; the regenerator 130 is disposed at the lower part of the combustion chamber 120 and is communicated with the combustion chamber 120, and high-temperature flue gas generated by combustion flows from top to bottom, enters the regenerator 130, heats the regenerator disposed in the regenerator 130, and is then discharged from a flue gas pipe 350 disposed at the lower part of the regenerator 130, which is called a furnace burning process. Specifically, the heat accumulator in the heat accumulation chamber 130 is a checker brick.
After the burning process is finished, the furnace is ready forAfter various indexes in the furnace body 100 reach set values, high-pressure cold coal gas is introduced, and the high-pressure cold coal gas enters the furnace body 100 from a high-pressure cold coal gas pipe 340 arranged at the lower part of the regenerator 130. It should be noted that the temperature of the high-pressure refrigerant gas is usually about 20 ℃, the high-pressure refrigerant gas flows from bottom to top, and sequentially passes through the grate and the heat storage chamber 130 arranged at the lower part of the furnace body 100, the heat storage body in the heat storage chamber 130 heats the high-pressure refrigerant gas, the high-pressure refrigerant gas is heated to about 1250 ℃ through two modes of convection and radiation heat transfer, the high-pressure refrigerant gas becomes high-pressure hot gas, and the high-pressure hot gas is sent into the hydrogen-carbon-rich circulation iron making blast furnace through the high-pressure hot gas pipe 330 arranged on the combustion chamber 120, and the process is called a gas heating process. It should be noted that the furnace gas is supplied to the burner 110 after being washed once and twice from the top gas of the carbon-cycle blast furnace, and is characterized by containing sulfur (S) and water vapor (H) 2 O) and dust content are both large, and the calorific value is low.
As shown in fig. 5, aiming at the characteristic of low calorific value of the gas for burning the furnace, the burner 110 disclosed by the embodiment of the invention is a high-power burner, which can realize rapid burning of the furnace; aiming at the characteristics that the burning gas contains S and is easy to cause the corrosion of refractory materials in the furnace body 100, the channel of the burner 110 disclosed by the embodiment of the invention adopts an arc-shaped airflow channel; aiming at the coal gas containing H of the burning furnace 2 O and dust content is large, and in order to prevent the burner refractory brick 113 from slagging at high temperature, the burner refractory brick 113 adopted in the embodiment of the invention is of a self-locking refractory brick structure, namely, the upper refractory brick of the burner refractory brick 113 is provided with a groove, the lower refractory brick is provided with a bulge, and the groove and the bulge are matched, so that after the building is completed, a whole is formed, and the structure is more stable. Specifically, the burner 110 may be a ceramic burner, which has the characteristics of high power, multiple fire holes and slag resistance, and can prolong the service life of the burner 110.
The furnace shell 200 is disposed outside the furnace body 100 and protects the furnace body 100. In order to improve the anti-explosion capability of the furnace shell 200, in a specific embodiment of the invention, the furnace shell 200 is anti-explosion and reinforced, the anti-explosion capability of the furnace shell 200 is more than or equal to 1.1MPa, and the general explosion of 0.45MPa in the furnace can be absorbed, so that the condition that a gas heating furnace matched with a hydrogen-carbon-rich circulating blast furnace is damaged when meeting the general explosion is avoided, and the stable operation of the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace is ensured. Specifically, in order to ensure the explosion-proof performance of the furnace shell 200, the furnace shell 200 is made of 355R type steel, the pressure margin coefficient of the design calculation of the furnace shell 200 is obtained according to a high value, the furnace shell 200 is appropriately thickened during design, and the specific thickening value is specifically set by a person skilled in the art according to actual conditions. It will be understood by those skilled in the art that the type of the steel material used for the furnace shell 200 can be selected according to the actual situation, as long as the stability and firmness of the furnace shell 200 can be ensured.
According to the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace disclosed by the embodiment of the invention, high-pressure cold gas is heated into high-pressure hot gas through the furnace burning process and the gas heating process, and the high-pressure hot gas is sent to the hydrogen-carbon-rich circulating iron-making blast furnace, so that the carbon consumption of the hydrogen-carbon-rich circulating iron-making blast furnace is reduced, and the high-pressure hot gas requirement of the hydrogen-carbon-rich circulating iron-making blast furnace is met.
As shown in fig. 1, in an embodiment of the present invention, a combustion air pipe 320 is provided at an upper portion of the furnace gas pipe 310.
As shown in fig. 1-3, in order to ensure that the burner gas and the combustion air can be fully mixed, in an embodiment of the present invention, a burner gas loop 111 is disposed on the burner 110, a burner gas pipe 310 is connected to the burner gas loop 111, the burner gas enters the burner gas loop 111 through the burner gas pipe 310, a burner gas nozzle is disposed on the burner gas loop 111, and the burner gas is ejected from the burner gas nozzle; the burner 110 is provided with a combustion-supporting air loop 112, a combustion-supporting air pipe 320 is communicated with the combustion-supporting air loop 112, the combustion-supporting air enters the combustion-supporting air loop 112 through the combustion-supporting air pipe 320, a combustion-supporting air nozzle is arranged on the combustion-supporting air loop 112, and the combustion-supporting air is sprayed out from the combustion-supporting air nozzle and mixed with the furnace coal gas. The arrangement of the burner gas loop 111 and the combustion air loop 112 allows the burner gas and the combustion air to be fully mixed.
As shown in fig. 1, in order to prevent the upper part of the gas heating furnace matched with the hydrogen-rich carbon circulation blast furnace from being damaged in the case of extreme explosion, in an embodiment of the present invention, a furnace gas pipe port explosion venting device 410 is disposed on the furnace gas pipe 310, and a combustion air pipe port explosion venting device 420 is disposed on the combustion air pipe 320. Specifically, the furnace gas port explosion venting device 410 is disposed on the furnace gas pipe 310 at a position closer to the furnace shell 200, and the specific distance is not limited herein, as long as it is ensured that the furnace gas port explosion venting device 410 can rapidly vent the pressure when the explosion occurs inside the furnace body 100. Specifically, the furnace gas orifice explosion venting device 410 and the combustion air orifice explosion venting device 420 have a self-return function, that is, when the interior of the furnace body 100 explodes, the furnace gas orifice explosion venting device 410 and the combustion air orifice explosion venting device 420 automatically open, and automatically close after the pressure in the furnace body 100 is vented. The arrangement of the furnace gas orifice explosion venting device 410 and the combustion air orifice explosion venting device 420 effectively protects the upper part of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace from being damaged when explosion occurs in the furnace body 100.
In a specific embodiment of the present invention, the burner gas orifice explosion venting device 410 is disposed on the burner gas pipe 310 at a position about 800mm away from the furnace shell 200, and the position is closer to the furnace body 100, so as to most rapidly relieve the explosion pressure in the furnace body 100, and meanwhile, because 800mm belongs to a reducer section and a bricklaying layer is disposed inside, the 800mm pipe section does not have a space for disposing the burner gas orifice explosion venting device 410, and the specific disposition can be set by those skilled in the art according to actual conditions. The specific position of the combustion air nozzle explosion venting device 420 arranged on the combustion air pipe 320 can be determined according to the actual situation.
In order to avoid the damage to the lower part of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace under the condition of extreme explosion, in a specific embodiment of the invention, a flue gas pipe opening explosion venting device 430 is arranged on the flue gas pipe 350. Specifically, the smoke pipe opening explosion venting device 430 is arranged on the smoke pipe 350 at a position close to the furnace shell 200, and the specific distance is not limited herein, as long as the smoke pipe opening explosion venting device 430 can rapidly release pressure when explosion occurs in the furnace body 100. Specifically, the flue gas pipe opening explosion venting device 430 has a self-return function, that is, when the interior of the furnace body 100 explodes, the flue gas pipe opening explosion venting device 430 is automatically opened, and after the pressure in the furnace body 100 is vented, the flue gas pipe opening explosion venting device is automatically closed. The arrangement of the flue gas pipe opening explosion venting device 430 effectively protects the lower part of the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace from being damaged when the inside of the furnace body 100 is exploded.
As shown in fig. 1, in order to prevent the gas heating furnace matched with the hydrogen-rich carbon circulating blast furnace from exploding when the furnace burning process and the gas heating process are switched, a nitrogen purging device is further included on the basis of the above embodiment. After the furnace burning process is finished, the residual oxygen in the furnace body 100 is remained, so that the high-pressure refrigerant gas entering the furnace and the residual oxygen are prevented from exploding, nitrogen replacement purging is required to be performed in the furnace, and after the oxygen content in the furnace is in a safe range, the gas heating process is converted.
After the coal gas heating process is finished, when the furnace burning process is switched, a large amount of carbon monoxide is remained in the furnace, a large amount of air enters the furnace during the furnace burning process, the explosion easily occurs, and nitrogen replacement purging is needed to be performed for avoiding the explosion. In order to facilitate nitrogen purging, the furnace gas loop 111 is connected to the nitrogen purging device, the combustion air loop 112 is connected to the nitrogen purging device, and the dome of the burner 110 is connected to the nitrogen purging device for nitrogen purging of the interior of the furnace body 100.
After the furnace burning process is finished, the nitrogen purging device is started to purge nitrogen in the furnace burning gas loop 111, the combustion air loop 112 and the furnace body 100, the nitrogen flows through the burner 110, the combustion chamber 120 and the regenerator 130 from top to bottom, and is finally discharged out of the furnace through the flue gas pipe 350 at the lower part of the regenerator 130. This process is an oxygen displacement process. And stopping nitrogen purging and replacement when the detected value of the oxygen concentration in the furnace body 100 is less than or equal to 1%, feeding high-pressure cold coal gas, and converting into a coal gas heating process. After the gas heating process is finished, the nitrogen purging device is started to perform nitrogen purging on the furnace gas loop 111, the combustion air loop 112 and the furnace body 100, wherein nitrogen flows through the burner 110, the combustion chamber 120 and the regenerator 130 from top to bottom, and is finally discharged out of the furnace through the flue gas pipe 350 at the lower part of the regenerator 130. And stopping N2 purging and replacement when the detected value of the concentration of the carbon dioxide in the furnace body 100 is less than or equal to 3 percent, wherein the process is called a carbon monoxide replacement process. It should be noted that the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace disclosed by the embodiment of the invention comprises a furnace burning process, an oxygen replacement process, a gas heating process and a carbon monoxide replacement process, and the four processes form a complete cycle of the gas heating furnace matched with the hydrogen-carbon-rich circulating blast furnace.
In a specific embodiment of the present invention, the regenerator 130 includes a first regenerator 131 and a second regenerator 132. The first regenerator 131 is disposed at the lower portion of the combustion chamber 120 and is in communication with the combustion chamber 120, and the second regenerator 132 is disposed at the lower portion of the first regenerator 131 and is in communication with the first regenerator 131. At high temperatures, the lining in the furnace body 100 is made of refractory material, and iron oxide (FeO) in the refractory material contacts carbon monoxide (CO) in the gas at high temperatures for a long period of time to generate (Fe) and carbon dioxide (CO) 2 ) The components of the refractory material are changed, and the stability of the refractory material can be damaged, so that the stability of the gas heating furnace matched with the whole hydrogen-rich carbon circulating blast furnace is damaged. In order to avoid the phenomenon, the main parts of the gas heating furnace matched with the whole hydrogen-carbon-rich circulating blast furnace adopt low-iron refractory material technology. The checker bricks adopted by the first regenerator 131 are low-iron checker bricks with 37 holes and 20mm diameter, the stability of the checker bricks is ensured by the low iron, the holes with 37 holes and 20mm diameter have 68.7m heat storage area 2 /m 3 The heat storage area is large, the heat exchange capacity is strong, and the high-pressure cold coal gas can be heated to the temperature of the high-pressure hot coal gas required by the blast furnace, generally speaking, the temperature of the hot coal gas is about 1250 ℃.
In order to improve the stability of the second regenerator 132 and reduce the carbon deposition amount, the embodiment of the invention discloses a gas heating furnace matched with a hydrogen-rich carbon circulating blast furnace, the checker bricks adopted by the second regenerator 132 are heat-resistant cast iron checker bricks, compared with high-aluminum checker bricks, the heat-resistant cast iron checker bricks have stronger heat storage capacity and heat conduction capacity, and the height of the heat-resistant cast iron checker bricks can be reduced by about 38% compared with the high-aluminum checker bricks when the heat storage capacity is the same, namely the retention time of the heated gas in the grid holes is reduced by about 38% when the temperature is raised to the same degree, which is beneficial to shortening the carbon deposition reaction time of the heated gas, thereby reducing the carbon deposition amount. It will be appreciated by those skilled in the art that the specific zone height of the second regenerator 132 may be determined based on the actual conditions.
As shown in fig. 4, in order to suppress carbon deposition generated during the heating of the high-pressure refrigerant gas, a steam pipe 360 is connected to a lower portion of the second regenerator 132, and a steam nozzle 363 is provided on the steam pipe 360, and the steam nozzle 363 is provided at an inlet of the high-pressure cold gas fed from the high-pressure cold gas pipe 340. The high-pressure cold coal gas contains high carbon monoxide with the concentration of about 65.9 percent, the combustible concentration range of the carbon monoxide in the air (the standard state is 20 ℃,101.325 kPa) is 12.5 to 74 percent, and the minimum ignition point in the air is 630 ℃. Carbon monoxide can generate carbon precipitation reaction when heated under the condition of air isolation, the generated carbon is extremely fine carbon powder, and the carbon powder is in a loose block shape due to accumulation and condensation. The coal powder is a combustible substance, is a B-type fire hazard dangerous material and has the blasting property, the ignition point is between 300 and 500 ℃, and the lower explosion limit concentration is 34g/m 3 ～47g/m 3 (the average particle diameter of the dust is 5 to 10 μm). The steam has an inhibiting effect on carbon deposition in the heating process of the high-pressure refrigerant gas.
Specifically, the steam pipe 360 is disposed below the grate at the lower portion of the second regenerator 132, and the steam nozzle 363 is disposed at an inlet of the high-pressure cold gas supplied from the high-pressure cold gas pipe 340. The steam nozzle 363 is arranged at the inlet of the cold gas conveyed by the high-pressure cold gas pipe 340, so that the steam sprayed out from the steam nozzle 363 can be fully contacted with the carbon deposit generated in the heating process of the high-pressure cold gas entering the furnace body 100, the carbon deposit can be oxidized into carbon monoxide, and the generation of the carbon deposit is reduced. It should be noted that the specific number of the steam nozzles 363 is specifically set according to actual conditions.
On the basis of the above embodiments, in order to make the steam nozzle 363 spray the water vapor into the furnace body 100 to further increase the contact area with the carbon deposit, in an embodiment of the present invention, the steam 360 includes a main steam pipe 361 and an annular steam pipe 362. Wherein, one end of the steam pipe main pipe 361 is connected with a steam source, and the other end thereof extends into the furnace body 100; a steam pipe collar 362 is provided inside the furnace body 100, connected to the steam pipe main 361, and the steam pipe collar 362 is annularly arranged along the center line of the furnace body 100, and steam nozzles 363 are provided on the steam pipe collar 362. The steam pipe collar 362 can be configured to increase the number of steam nozzles 363. The number of the steam nozzles 363 is plural, and in a specific embodiment of the present invention, the number of the steam nozzles 363 may be 6 to 8, and the specific number may be specifically set by a person skilled in the art according to actual situations.
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", and/or "the" do not denote a singular form, but rather include a plural form, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. The use of the phrase "comprising" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the same elements.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "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. A kind of hydrogen-rich carbon circulates the supporting coal gas heating furnace of blast furnace, is used for providing the hot coal gas of high pressure for the hydrogen-rich carbon circulates the ironmaking blast furnace, characterized by that, including:
the furnace body (100) comprises a combustion chamber (120) and a heat storage chamber (130), a burner (110) is arranged at the upper part of the furnace body (100), the burner (110) is provided with a furnace gas burning pipe (310) and a combustion air pipe (320), the furnace gas burning pipe (310) is used for conveying furnace gas, and the combustion air pipe (320) is used for conveying combustion air; the combustion chamber (120) is arranged at the lower part of the combustor (110) and communicated with the combustor (110), the combustion chamber (120) is provided with a high-pressure hot gas pipe (330), and the high-pressure hot gas pipe (330) is used for conveying high-pressure hot gas to the hydrogen-carbon-rich circulating iron-making blast furnace; the regenerative chamber (130) is arranged at the lower part of the combustion chamber (120) and is communicated with the combustion chamber (120), a high-pressure cold gas pipe (340) and a flue gas pipe (350) are arranged at the lower part of the regenerative chamber (130), the high-pressure cold gas pipe (340) is used for conveying high-pressure cold gas, and the flue gas pipe (350) is used for discharging waste gas;
a furnace shell (200) disposed outside the furnace body (100).
2. The hydrogen-carbon rich circulation blast furnace supporting gas heating furnace as set forth in claim 1, wherein said combustion air pipe (320) is provided at an upper portion of said furnace gas pipe (310).
3. The hydrogen-carbon-rich circulating blast furnace matching gas heating furnace as claimed in claim 2, wherein a furnace burning gas loop (111) is arranged on the burner (110), and the furnace burning gas pipe (310) is communicated with the furnace burning gas loop (111);
the combustor (110) is provided with a combustion-supporting air loop (112), and the combustion-supporting air pipe (320) is communicated with the combustion-supporting air loop (112).
4. The gas heating furnace matched with the hydrogen-rich carbon circulation blast furnace as claimed in claim 3, wherein a gas nozzle explosion venting device (410) of the gas burning pipe (310) is arranged on the gas burning pipe;
a combustion-supporting air pipe orifice explosion venting device (420) is arranged on the combustion-supporting air pipe (320);
and a flue gas pipe orifice explosion venting device (430) is arranged on the flue gas pipe (350).
5. The hydrogen-carbon-rich circulation blast furnace matched gas heating furnace as claimed in claim 3, further comprising a nitrogen purging device;
the furnace gas loop (111) is connected with the nitrogen purging device;
the combustion air loop (112) is connected with the nitrogen purging device;
the vault of the combustor (110) is connected with the nitrogen purging device and is used for purging the interior of the furnace body (100) with nitrogen.
6. The hydrogen-rich carbon cycle blast furnace supporting gas heating furnace of claim 1, wherein said regenerator (130) comprises:
a first regenerator (131) disposed at a lower portion of the combustion chamber (120) and communicating with the combustion chamber (120);
and a second regenerative chamber (132) disposed at a lower portion of the first regenerative chamber (131) and communicating with the first regenerative chamber (131).
7. The hydrogen-rich carbon cycle blast furnace supporting gas heating furnace according to claim 6, wherein said first regenerator (131) uses checker bricks having 37 holes of low iron and a diameter of 20 mm;
the checker bricks adopted by the second heat storage chamber (132) are heat-resistant cast iron checker bricks.
8. The gas-fired furnace as set forth in claim 7, wherein a steam pipe (360) is connected to a lower portion of said second regenerator (132), said steam pipe (360) being provided with a steam nozzle (363), said steam nozzle (363) being provided at an inlet of the high-pressure cold gas supplied from said high-pressure cold gas pipe (340).
9. The hydrogen-carbon rich circulation blast furnace supporting gas heating furnace according to claim 8, wherein said steam pipe (360) comprises a main steam pipe (361) and a bustle steam pipe (362);
one end of the main steam pipe (361) is connected with a steam source, and the other end of the main steam pipe extends into the furnace body (100);
the steam ring pipe (362) is connected with the main steam pipe (361), the steam ring pipe (362) is arranged inside the furnace body (100), and the steam nozzles (363) are arranged on the steam ring pipe (362).
10. The hydrogen-carbon rich circulating blast furnace supporting gas heating furnace as set forth in any one of claims 1 to 9, wherein said burner (110) is a ceramic burner.
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