CN218202968U - Graded cyclic utilization system for bell-type furnace protective gas - Google Patents
Graded cyclic utilization system for bell-type furnace protective gas Download PDFInfo
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- CN218202968U CN218202968U CN202221696993.7U CN202221696993U CN218202968U CN 218202968 U CN218202968 U CN 218202968U CN 202221696993 U CN202221696993 U CN 202221696993U CN 218202968 U CN218202968 U CN 218202968U
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Abstract
The utility model provides a bell-type furnace protective gas grading recycling system, wherein the input end of a furnace platform is connected with a hydrogen flowmeter, and the output end of the furnace platform is connected with a mechanical pressure stabilizing valve; a nitrogen gas inlet valve is arranged between the hydrogen flowmeter and the nitrogen gas inlet pipeline, a first hydrogen gas inlet valve and a second hydrogen gas inlet valve are arranged between the hydrogen flowmeter and the hydrogen gas inlet pipeline, and a first recovered hydrogen gas inlet valve and a second recovered hydrogen gas inlet valve are arranged between the hydrogen flowmeter and the recovered protective gas inlet pipeline; a nitrogen air discharge valve is arranged between the mechanical pressure maintaining valve and the nitrogen discharge pipeline, a nitrogen hydrogen discharge valve is arranged between the mechanical pressure maintaining valve and the waste protective gas discharge pipeline, and a hydrogen flow regulating valve and a hydrogen discharge valve are arranged between the mechanical pressure maintaining valve and the waste protective gas recovery pipeline; the waste protective gas recovery pipeline is connected with the protective gas recovery inlet pipeline. This application is through retrieving and purifying the protective gas, carries the stove top recycle again with the protective gas, has avoided the waste of protective gas.
Description
Technical Field
The utility model relates to a bell-type furnace protective gas cyclic utilization system specifically relates to bell-type furnace protective gas cyclic utilization system in grades.
Background
Hood annealing generally refers to the annealing of cold rolled strip in a stack in a hood furnace. Annealing is the most important heat treatment process in the production of cold-rolled sheet strip steel, the purpose of annealing after cold rolling is mainly to soften the metal subjected to high cold work hardening again, the most widely applied in the heat treatment of the cold-rolled sheet strip steel is a hood-type annealing furnace, the hood-type furnace annealing belongs to bright annealing of a cold-rolled steel sheet coil, and protective gas needs to be introduced in the annealing process to prevent the steel sheet coil from being oxidized in the annealing process. At present, all-hydrogen cap annealing is mostly adopted.
The actual loss gas of the all-hydrogen hood-type annealing protective gas is very little in the operation process, and the rest protective gas is directly combusted or exhausted to the atmosphere, so that the great resource waste is caused. Therefore, it is desirable to provide a system for recovering, purifying and recycling the shielding gas.
Patent document CN104404239B provides a method for thermal circulation of protective gas of a hood-type annealing furnace, i.e. during the annealing process, according to the temperature rise and fall of each hearth, the furnace with the temperature above 450 ℃ is cooled, the furnace with the temperature below 300 ℃ is heated, the protective gas is sent into the heating furnace from the cooling furnace, i.e. during the heat treatment process of the hood-type annealing furnace, the annealing valves of the furnace of the heating section and the furnace of the cooling section are opened, the closing valve is closed, the thermal protective gas is sent into the furnace of the heating section from the furnace of the cooling section, meanwhile, the air inlet valve of the furnace of the heating section is closed, the air inlet valve of the furnace of the cooling section is opened, and the furnace pressure of the protective gas of two hearths is ensured to meet the process requirements.
Patent document CN103215414A discloses a vacuum-pumping bell-type bright annealing furnace shielding gas recycling system, which includes a plurality of bell-type furnace bodies, the bell-type furnace bodies are provided with gas outlet pipelines, the gas outlet pipelines are provided with gas return valves, the gas outlet pipelines are communicated with a shielding gas recovery device, gas inlets of the shielding gas recovery device are communicated with gas return pipelines of the bell-type furnace groups, the gas return pipelines are communicated with the bell-type furnace bodies, the bell-type furnace bodies are provided with gas exhaust pipelines, the gas exhaust pipelines are communicated with a vacuum pump, and a pump body is communicated with a vent pipeline.
At present, the prior art can not effectively recycle, purify and recycle the recovered protective gas.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims at providing a cover furnace protective gas grading and recycling system.
According to the utility model provides a bell-type furnace shielding gas classification cyclic utilization system, include: the device comprises a nitrogen inlet pipeline, a nitrogen discharge pipeline, a hydrogen inlet pipeline, a waste protective gas discharge pipeline, a waste protective gas recovery pipeline, a recovered protective gas inlet pipeline and a furnace platform;
the furnace platform is connected with the nitrogen gas inlet pipeline, the nitrogen gas discharge pipeline, the hydrogen gas inlet pipeline, the waste protective gas discharge pipeline, the waste protective gas recovery pipeline and the recovered protective gas inlet pipeline, and the waste protective gas recovery pipeline is connected with the recovered protective gas inlet pipeline.
Preferably, useless protective gas retrieves pipe connection and detects and the cut-off system, detect and cut-off system connection coarse filtration system, coarse filtration system connects the primary cooling water heat exchanger, the primary cooling water heat exchanger connects the primary air-water separator, the buffer tank is connected to the primary air-water separator, fan charge system is connected to the buffer tank, fine filtration system is connected to fan charge system, fine filtration system connects the oxygen-eliminating device, the second grade cooling water heat exchanger is connected to the oxygen-eliminating device, the refrigerated water heat exchanger is connected to the second grade cooling water heat exchanger, the second grade air-water separator is connected to the refrigerated water heat exchanger, the molecular sieve desicator is connected the recovered gas flowmeter, recovered gas flowmeter connects pressure regulation and cut-off system, pressure regulation and cut-off system connection analytic system, analytic system connects the recovered protective gas inlet line.
The detection and cut-off system is internally provided with a pressure transmitter and an automatic cut-off valve, is used for detecting the pressure of recovered protective gas, can quickly cut off the connection between the bell-type furnace and the recycling system, and is suitable for the preparation work before the recycling system is shut down and started up in an emergency state;
the coarse filtration system is used for removing oil stains and impurities in the recovered protective gas;
the one-level cooling water heat exchanger is used for further reducing the temperature of retrieving the protective gas, more does benefit to moisture separation, the moisture in the separation gas is realized through the container structure design to one-level moisture separator, the one-level cooling water heat exchanger one-level moisture separator and the buffer tank realizes jointly that the free water and the system atmospheric pressure buffering in retrieving the protective gas are got rid of tentatively.
The fan supercharging system is used for supercharging the recovered protective gas, and the fine filtering system is used for further filtering and dedusting the recovered protective gas;
the deaerator realizes the chemical reaction of hydrogen and residual oxygen by utilizing the catalytic action of a palladium catalyst, and eliminates the residual oxygen in the recovered protective gas;
the secondary cooling water heat exchanger is used for further reducing the temperature of the recovered shielding gas and is more beneficial to moisture separation, the chilled water heat exchanger is used for further reducing the temperature of the recovered shielding gas and further removing moisture of the recovered shielding gas, the secondary gas-water separator is used for separating moisture in the gas through the structural design of a container, and the secondary cooling water heat exchanger, the chilled water heat exchanger and the secondary gas-water separator are used for jointly reducing the temperature of the recovered shielding gas and further removing the moisture; the secondary cooling water heat exchanger and the chilled water heat exchanger are used for reducing and recovering moisture in the protective gas to the maximum extent through a conventional cooling mode, so that the water absorption load of the molecular sieve dryer is further reduced, and the molecular sieve dryer can be designed more economically.
The chilled water heat exchanger is a heat exchanger with the temperature of the cooling liquid lower than that of the cooling liquid of the secondary cooling water heat exchanger.
The molecular sieve dryer is used for further drying the recovered protective gas, and two sets of molecular sieve dryers are configured to realize simultaneous adsorption and desorption;
the recovered gas flowmeter is used for monitoring the flow of the recovered protective gas;
the pressure adjusting and cutting system is used for adjusting the pressure of the recovered protective gas, quickly cutting off the connection between the bell-type furnace and the recycling system, and is suitable for the preparation work before the recycling system is shut down and started up in an emergency state;
the analysis system is provided with a micro-oxygen analyzer, a hydrogen analyzer and a dew point instrument which are respectively used for measuring residual oxygen content and hydrogen content in the recovered protective gas and the dew point of the recovered protective gas.
Preferably, the furnace platform is connected with a hydrogen flowmeter and a mechanical pressure maintaining valve, and the mechanical pressure maintaining valve is used for ensuring that a pressure maintaining value meeting the requirement exists in the bell-type furnace when the protective gas of the bell-type furnace is discharged.
Preferably, the hydrogen flowmeter is connected with a second recovered hydrogen inlet valve, the second recovered hydrogen inlet valve is connected with a first recovered hydrogen inlet valve, and the first recovered hydrogen inlet valve is connected with the recovered protective gas inlet pipeline.
Preferably, the hydrogen flowmeter is connected with a second hydrogen inlet valve, the second hydrogen inlet valve is connected with a first hydrogen inlet valve, the first hydrogen inlet valve is connected with the hydrogen inlet pipeline, the first hydrogen inlet valve and the second hydrogen inlet valve are used for realizing the on-off of hydrogen inlet of the hydrogen inlet pipeline, and the purpose of setting the two valves of the first hydrogen inlet valve and the second hydrogen inlet valve is further to ensure safety and no leakage.
Preferably, the hydrogen flowmeter is connected with a nitrogen gas inlet valve, the nitrogen gas inlet valve is connected with the nitrogen gas inlet pipeline, and the nitrogen gas inlet valve allows the nitrogen gas inlet pipeline to convey newly input hydrogen into the furnace platform.
Preferably, the mechanical pressure maintaining valve is connected with a nitrogen air discharge valve, the nitrogen air discharge valve is connected with the nitrogen discharge pipeline, and the nitrogen air discharge valve allows the nitrogen discharge pipeline to discharge furnace air replaced by nitrogen before production and gas for purging and replacing hydrogen in the furnace by using nitrogen.
Preferably, the mechanical pressure maintaining valve is connected with a nitrogen and hydrogen discharge valve, the nitrogen and hydrogen discharge valve is connected with the waste protective gas discharge pipeline, and the waste protective gas discharge pipeline is used for discharging nitrogen to replace hydrogen before the furnace burden of the bell-type furnace is discharged.
Preferably, the mechanical pressure stabilizing valve is connected with a hydrogen flow regulating valve, the hydrogen flow regulating valve is connected with a hydrogen discharge valve, the hydrogen discharge valve is connected with the waste protective gas recovery pipeline, the hydrogen flow regulating valve is used for regulating the flow of the purging hydrogen, the hydrogen discharge valve is used for cutting off the purging hydrogen, and the waste protective gas recovery pipeline is used for recovering the hydrogen protective gas discharged in the annealing process.
Preferably, the furnace platform, the hydrogen flow meter, the mechanical pressure maintaining valve, the nitrogen gas inlet valve, the first hydrogen gas inlet valve, the second hydrogen gas inlet valve, the first recovered hydrogen gas inlet valve, the second recovered hydrogen gas inlet valve, the nitrogen gas air exhaust valve, the nitrogen gas hydrogen exhaust valve, the hydrogen flow regulating valve and the hydrogen gas exhaust valve are provided with one or more groups.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. according to the method, the protective gas is recovered and purified, and then the protective gas is conveyed to the furnace platform again for recycling, so that the waste of the protective gas is avoided;
2. the method realizes the integrated production of gas supply, use, recovery and operation of the cover furnace protective gas, and reduces the labor and operation cost;
3. by adopting the structure of independent gas supply of fresh hydrogen and recovered shielding gas, the function of graded utilization of the shielding gas is realized, and the hydrogen recovery and utilization efficiency is essentially improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a protective gas grading recycling system;
shown in the figure:
Detailed Description
The present invention will be described in detail with reference to specific embodiments. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one of ordinary skill in the art without departing from the spirit of the invention. All of which belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment includes: the device comprises a nitrogen inlet pipeline 1, a nitrogen discharge pipeline 2, a hydrogen inlet pipeline 3, a waste protective gas discharge pipeline 4, a waste protective gas recovery pipeline 5, a recovered protective gas inlet pipeline 6 and a furnace platform 7; the furnace platforms 7 are provided with one or more furnace platforms 7, the plurality of furnace platforms 7 are connected with a nitrogen gas inlet pipeline 1, a nitrogen gas discharge pipeline 2, a hydrogen gas inlet pipeline 3, an exhaust protective gas discharge pipeline 4, an exhaust protective gas recovery pipeline 5 and a recovery protective gas inlet pipeline 6 in parallel, and the exhaust protective gas recovery pipeline 5 is connected with the recovery protective gas inlet pipeline 6; each furnace platform 7 in the furnace group can independently select to adopt fresh hydrogen for annealing, and can also select to adopt recycled protective gas for annealing.
The waste protective gas recovery pipeline 5 is connected with a detection and cutting system 501, the detection and cutting system 501 is used for detecting the pressure of recovered protective gas and can quickly cut off the connection between the bell-type furnace and the recycling system, and the device is suitable for the preparation work before the recycling system is shut down and started up in an emergency state; the detection and cutting system 501 is connected with a coarse filtration system 502, and the coarse filtration system 502 is used for removing oil stains and impurities in the recovered shielding gas; the coarse filtration system 502 is connected with a primary cooling water heat exchanger 503, the primary cooling water heat exchanger 503 is connected with a primary gas-water separator 504, the primary gas-water separator 504 is connected with a buffer tank 505, and the primary cooling water heat exchanger 503, the primary gas-water separator 504 and the buffer tank 505 are used for preliminarily removing free water in the recovered protective gas and buffering the system air pressure; the buffer tank 505 is connected with a fan supercharging system 506, the fan supercharging system 506 is connected with a fine filtering system 507, the fan supercharging system 506 is used for supercharging the recovered shielding gas, and the fine filtering system 507 is used for further filtering and dedusting the recovered shielding gas; the fine filtering system 507 is connected with a deaerator 508, and the deaerator 508 realizes the chemical reaction of the hydrogen and the residual oxygen by using the catalytic action of a palladium catalyst, and eliminates the residual oxygen in the recovered protective gas; the deaerator 508 is connected with a secondary cooling water heat exchanger 509, the secondary cooling water heat exchanger 509 is connected with a chilled water heat exchanger 510, the chilled water heat exchanger 510 is connected with a secondary gas-water separator 511, and the secondary cooling water heat exchanger 509, the chilled water heat exchanger 510 and the secondary gas-water separator 511 are used for further cooling the recovered shielding gas to further remove moisture; the secondary gas-water separator 511 is connected with the molecular sieve dryer 512, the molecular sieve dryer 512 further dries the recovered protective gas, and two sets of molecular sieve dryers 512 are configured to realize that adsorption and desorption can be carried out simultaneously; the molecular sieve dryer 512 is connected with a recycled gas flowmeter 513, and the recycled gas flowmeter 513 is used for monitoring the flow of the recycled shielding gas; the reclaimed gas flowmeter 513 is connected with a pressure adjusting and cutting system 514, the pressure adjusting and cutting system 514 is used for adjusting the pressure of reclaimed protective gas, quickly cutting off the connection between the furnace platform 7 and the recycling system, and is suitable for the preparation work before the shutdown and the startup of the recycling system in an emergency state; the pressure regulating and cut-off system 514 is connected with an analysis system 515, and the analysis system 515 is connected with the recovered protective gas inlet pipeline 6.
The furnace platform 7 is connected with a hydrogen flow meter 701 and a mechanical pressure stabilizing valve 702, the hydrogen flow meter 701 is connected with a second recovered hydrogen gas inlet valve 602, the second recovered hydrogen gas inlet valve 602 is connected with a first recovered hydrogen gas inlet valve 601, and the first recovered hydrogen gas inlet valve 601 is connected with a recovered protective gas inlet pipeline 6. The hydrogen flowmeter 701 is connected with the second hydrogen inlet valve 302, the second hydrogen inlet valve 302 is connected with the first hydrogen inlet valve 301, and the first hydrogen inlet valve 301 is connected with the hydrogen inlet pipeline 3. The hydrogen flowmeter 701 is connected to the nitrogen gas inlet valve 101, and the nitrogen gas inlet valve 101 is connected to the nitrogen gas inlet line 1. The mechanical pressure maintaining valve 702 is connected with the nitrogen air discharge valve 201, and the nitrogen air discharge valve 201 is connected with the nitrogen discharge pipeline 2. The mechanical pressure stabilizing valve 702 is connected with the nitrogen and hydrogen discharge valve 401, and the nitrogen and hydrogen discharge valve 401 is connected with the waste protective gas discharge pipeline 4. The mechanical pressure stabilizing valve 702 is connected with a hydrogen flow regulating valve 516, the hydrogen flow regulating valve 516 is connected with a hydrogen discharge valve 517, and the hydrogen discharge valve 517 is connected with the waste protective gas recovery pipeline 5.
The working principle is as follows:
the process of using the cover furnace protective gas is as follows: s1, safe purging: before the annealing heating is started, nitrogen protective gas is adopted to blow the air in the inner cover, so that the residual oxygen concentration of the atmosphere in the inner cover is reduced; s2, after the safe purging is finished, buckling a heating cover, heating according to a set annealing process, purging with hydrogen in the heating process, and completely removing nitrogen in the furnace to achieve the purpose of full hydrogen annealing; and S3, when the temperature of the furnace platform 7 is cooled to the tapping temperature, purging and replacing the hydrogen in the furnace by adopting nitrogen.
The gas discharged by nitrogen purging in the step S1 and the step S3 can be discharged by the nitrogen discharge line 2, the gas discharged by hydrogen replacing nitrogen in the step S2 can be discharged by the waste shielding gas discharge line 4, and the hydrogen discharged in the full hydrogen annealing process in the step S2 is recovered by the waste shielding gas recovery line 5 and then is conveyed to the furnace platform 7 through the recovery shielding gas inlet line 6.
Among them, the present embodiment has the following features: in the step S3, the nitrogen purges the earlier stage of hydrogen in the furnace platform 7, for example, 10 minutes, the hydrogen flow control valve 516 and the hydrogen discharge valve 517 pipelines can be conveniently used for introducing the hydrogen in the full hydrogen atmosphere in the whole equipment of the furnace platform 7 into the waste protective gas recovery pipeline 5, the high-content hydrogen in the earlier stage of the nitrogen purging hydrogen is recovered, the purging with flow control is performed at this moment, the large-flow gas impact on the protective gas recovery device does not exist, the protective gas with high hydrogen content in the step S3 is further recovered, after 10 minutes, the hydrogen content is reduced, the nitrogen hydrogen discharge valve 401 is opened, the hydrogen flow control valve 516 and the hydrogen discharge valve 517 are closed to realize the function of replacing the hydrogen with the nitrogen, and the nitrogen purging flow and the nitrogen purging time are controlled to ensure that the step S3 is safe and effective purging.
Example 2
Example 2 is a preferred example of example 1.
As shown in FIG. 1, this embodiment is provided with a nitrogen gas inlet valve 101 and a nitrogen gas air discharge valve 201 for replacing the air in the furnace with nitrogen gas before the start of production in the bell type furnace (front purge) and for purging the replaced gas with nitrogen gas. The furnace platform 7 is connected with a mechanical pressure stabilizing valve 702, so that a certain pressure maintaining value is ensured in the furnace platform 7 when the protective gas is discharged, and the blowing effect of the protective gas can be ensured. The first hydrogen inlet valve 301 and the second hydrogen inlet valve 302 are used for on-off control of hydrogen inlet, and two valves are provided for further ensuring safety and no leakage. The waste protective gas discharge pipeline 4 is provided with a nitrogen and hydrogen discharge valve 401 for discharging nitrogen gas to replace hydrogen gas (back purge) before the furnace charge is discharged. The hydrogen flow rate regulating valve 516 and the hydrogen discharge valve 517 realize the regulation and shutoff functions of the recovery guard gas flow rate.
Each stove platform 7 is provided with a recovery protective gas inlet pipeline 6, the recovery protective gas inlet pipeline 6 is connected with a first recovery hydrogen inlet valve 601 and a second recovery hydrogen inlet valve 602, and the on-off control of the recovery hydrogen inlet is realized.
This embodiment is provided with useless protective gas recovery pipeline 5, and useless protective gas recovery pipeline 5 is connected and is detected and hydrogen recovery units such as cutting system 501, coarse filtration system 502, and the recovery protective gas of all stove platforms 7 assembles on useless protective gas recovery pipeline 5, then causes the import of hydrogen recovery unit, realizes that bell-type furnace hydrogen discharges to be connected with hydrogen recovery. The inlet and the outlet of the hydrogen recovery device are provided with the automatic nitrogen purging function beside the stop valves of the detection and cut-off system 501 and the pressure regulation and cut-off system 514, so that the nitrogen replacement of the hydrogen recovery device can be quickly realized, and the intrinsic safety of equipment is ensured.
The hydrogen recovery device of the embodiment comprises: the detection and cutting system 501 comprises a pressure transmitter and an automatic cut-off valve and the like in the detection and cutting system 501, the pressure transmitter is used for detecting the pressure of the gas discharged by the bell-type furnace, and the automatic cut-off valve is used for quickly cutting off the connection between the bell-type furnace and the hydrogen recovery device and is suitable for the preparation work before the hydrogen recovery device is shut down and started in an emergency state. And the coarse filtering system 502 is used for removing oil stains, impurities and the like in the recovered protective gas. A primary cooling water heat exchanger 503, a primary gas-water separator 504 and a buffer tank 505, which are used for primarily removing free water in the recovered protective gas and buffering the air pressure of the system. The blower pressurization system 506 is a roots blower pressurization system for pressurizing the recovered shielding gas. And a fine filtering system 507 for further filtering and dedusting the recovered protective gas. The deaerator 508 utilizes the catalytic action of the palladium catalyst to realize the chemical reaction of the hydrogen and the residual oxygen and eliminate the residual oxygen in the protective gas. The secondary cooling water heat exchanger 509, the chilled water heat exchanger 510 and the secondary gas-water separator 511 are used for further cooling the recovered protective gas to further remove moisture. The molecular sieve dryer 512 selects a standard 13X or 5A molecular sieve to further dry the recovered protective gas, and two sets of molecular sieve dryers 512 are required to be configured to realize simultaneous adsorption and desorption and ensure stable and continuous operation of hydrogen recovery. The recovered gas flow meter 513 is used to monitor the flow of the recovered shielding gas. The pressure regulating and cutting system 514 is used for regulating the pressure of the recovered shielding gas to ensure that the pressure meets the requirement of the inlet pressure of the bell-type furnace group, and the cutting function is used for quickly cutting off the connection between the bell-type furnace and the hydrogen recovery device, and is suitable for the preparation work before the hydrogen recovery device is shut down and started in an emergency state. The analysis system 515 is provided with a micro-oxygen analyzer for measuring residual oxygen amount in the recovered shielding gas, a hydrogen analyzer for measuring hydrogen content in the recovered shielding gas, and a dew point meter for measuring dew point of the recovered shielding gas. In particular, only the recycled protective gas meeting the requirements of the various indexes can be allowed to be conveyed to the furnace platform 7.
The recovered protective gas is hydrogen-nitrogen mixed gas which is filtered and purified by a hydrogen recovery device after being used by a bell-type furnace, and the indexes of the recovered protective gas are that the purity of hydrogen is more than or equal to 95 percent, the rest is nitrogen, the dew point is less than or equal to minus 65 ℃, and the oxygen content is less than or equal to 5ppm. The protective gas can be used in a grading way according to annealing products, the protective gas is selected to be associated with the annealing products, for example, when high-grade food-grade tinplate annealing materials are produced, 99.999% of fresh hydrogen can be selected to be used as the protective gas for annealing, and when common carbon steel annealing furnace materials are produced, for example, 95% of recovered protective gas containing hydrogen can be selected to be used as the protective gas for annealing. The protective gas can be used in a grading mode according to different annealing process stages, and the recovered protective gas can be used for replacement in the stage of replacing nitrogen by hydrogen before annealing production, so that the high hydrogen atmosphere in the furnace can be quickly reached, and then the furnace can be switched to fresh protective gas for hydrogen purging, and annealing and hydrogen purging can be efficiently carried out.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present application.
The foregoing descriptions have been directed to embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a bell-type furnace shield gas classification cyclic utilization system which characterized in that includes: the device comprises a nitrogen inlet pipeline (1), a nitrogen discharge pipeline (2), a hydrogen inlet pipeline (3), an exhaust protective gas discharge pipeline (4), an exhaust protective gas recovery pipeline (5), a recovery protective gas inlet pipeline (6) and a furnace platform (7);
the input end of the furnace platform (7) is connected with a hydrogen flowmeter (701), and the output end of the furnace platform (7) is connected with a mechanical pressure stabilizing valve (702);
a nitrogen gas inlet valve (101) is arranged between the hydrogen flow meter (701) and the nitrogen gas inlet pipeline (1), a first hydrogen gas inlet valve (301) and a second hydrogen gas inlet valve (302) are arranged between the hydrogen flow meter (701) and the hydrogen gas inlet pipeline (3), and a first recovered hydrogen gas inlet valve (601) and a second recovered hydrogen gas inlet valve (602) are arranged between the hydrogen flow meter (701) and the recovered protective gas inlet pipeline (6);
a nitrogen air discharge valve (201) is arranged between the mechanical pressure maintaining valve (702) and the nitrogen discharge pipeline (2), a nitrogen hydrogen discharge valve (401) is arranged between the mechanical pressure maintaining valve (702) and the waste protective gas discharge pipeline (4), and a hydrogen flow regulating valve (516) and a hydrogen discharge valve (517) are arranged between the mechanical pressure maintaining valve (702) and the waste protective gas recovery pipeline (5);
and the waste protective gas recovery pipeline (5) is connected with the recovered protective gas inlet pipeline (6).
2. The cover furnace shielding gas graded recycling system of claim 1, wherein: waste protective gas recovery pipeline (5) are connected and are detected and cut-off system (501), it sets up pressure transmitter and automatic cutout valve to detect and cut-off system (501).
3. The cover furnace shielding gas graded recycling system of claim 2, wherein: the detection and cut-off system (501) is connected with the coarse filtration system (502), the coarse filtration system (502) is connected with the primary cooling water heat exchanger (503), the primary cooling water heat exchanger (503) is connected with the primary gas-water separator (504), and the primary gas-water separator (504) is connected with the buffer tank (505).
4. The bell-type furnace shielding gas graded recycling system of claim 3, wherein: the buffer tank (505) is connected with a blower supercharging system (506), and the blower supercharging system (506) adopts a Roots blower supercharging system.
5. The cover furnace shielding gas graded recycling system of claim 4, wherein: the fan supercharging system (506) is connected with a fine filtering system (507), and the fine filtering system (507) is connected with a deaerator (508).
6. The cover furnace shielding gas graded recycling system of claim 5, wherein: the deaerator (508) is connected with the secondary cooling water heat exchanger (509), the secondary cooling water heat exchanger (509) is connected with the chilled water heat exchanger (510), and the chilled water heat exchanger (510) is connected with the secondary gas-water separator (511).
7. The cover furnace shielding gas graded recycling system of claim 6, characterized in that: the secondary gas-water separator (511) is connected with the molecular sieve dryer (512), the molecular sieve dryer (512) is provided with a plurality of sets, and the plurality of sets of molecular sieve dryers (512) realize simultaneous adsorption and desorption.
8. The cover furnace shielding gas graded recycling system of claim 7, wherein: the molecular sieve dryer (512) is connected with a recycled gas flow meter (513), and the recycled gas flow meter (513) is connected with a pressure regulating and cutting system (514).
9. The cover furnace shielding gas graded recycling system of claim 8, wherein: the pressure regulating and cutting system (514) is connected with an analysis system (515), and the analysis system (515) is connected with the recovered protective gas inlet pipeline (6);
the analysis system (515) is provided with a micro-oxygen analyzer, a hydrogen analyzer and a dew point instrument.
10. The cover furnace shielding gas graded recycling system of claim 1, wherein: the furnace platform (7), the hydrogen flow meter (701), the mechanical pressure maintaining valve (702), the nitrogen gas inlet valve (101), the first hydrogen gas inlet valve (301), the second hydrogen gas inlet valve (302), the first recovered hydrogen gas inlet valve (601), the second recovered hydrogen gas inlet valve (602), the nitrogen gas air discharge valve (201), the nitrogen gas and hydrogen gas discharge valve (401), the hydrogen flow regulating valve (516) and the hydrogen gas discharge valve (517) are provided with one or more groups.
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| CN202221696993.7U CN218202968U (en) | 2022-07-01 | 2022-07-01 | Graded cyclic utilization system for bell-type furnace protective gas |
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