CN112143876A - Energy-saving type protective gas circulation system of galvanizing continuous annealing furnace and process thereof - Google Patents

Energy-saving type protective gas circulation system of galvanizing continuous annealing furnace and process thereof Download PDF

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Publication number
CN112143876A
CN112143876A CN202011211752.4A CN202011211752A CN112143876A CN 112143876 A CN112143876 A CN 112143876A CN 202011211752 A CN202011211752 A CN 202011211752A CN 112143876 A CN112143876 A CN 112143876A
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gas
continuous annealing
nitrogen
tail gas
annealing furnace
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CN202011211752.4A
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程长圣
陈正
程长亮
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Henan Kerong Gas Equipment Co ltd
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Henan Kerong Gas Equipment Co ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/56Continuous furnaces for strip or wire
    • C21D9/561Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/56Continuous furnaces for strip or wire
    • C21D9/562Details

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention belongs to the technical field of annealing furnace equipment, and discloses an energy-saving protective gas circulation system of a galvanizing continuous annealing furnace and a process thereof, wherein the energy-saving protective gas circulation system of the galvanizing continuous annealing furnace comprises a continuous annealing furnace, an ammonia decomposition hydrogen production device, a PSA nitrogen production device and a nitrogen-hydrogen proportioning device; according to the invention, the tail gas recovery device is adopted to recycle the tail gas of the continuous annealing furnace, so that the consumption of the protective gas can be reduced by more than 80%, thus reducing resource waste and reducing tail gas emission.

Description

Energy-saving type protective gas circulation system of galvanizing continuous annealing furnace and process thereof
Technical Field
The invention belongs to the technical field of annealing furnace equipment, and particularly relates to an energy-saving protective gas circulation system of a galvanizing continuous annealing furnace and a process thereof.
Background
At present, protective gas generally introduced into a domestic galvanizing line continuous annealing furnace is nitrogen-hydrogen mixed gas, nitrogen is prepared by a PSA (Pressure Swing Adsorption) nitrogen making machine, the PSA nitrogen making machine is a Pressure Swing Adsorption (PSA) nitrogen making machine, the principle is that a gas mixture is separated by utilizing the difference of Adsorption performance of a molecular sieve on different gas molecules, air is used as a raw material, and the nitrogen and oxygen in the air are separated by utilizing the selective Adsorption performance of a high-efficiency and high-selectivity solid adsorbent on the nitrogen and the oxygen; the hydrogen is produced by decomposing ammonia, the two gases are prepared into required proportion by a nitrogen-hydrogen proportioning device, the hydrogen content is 5-30 percent generally, and then the two gases are introduced into a galvanizing line continuous annealing furnace for use.
However, only about 1% of hydrogen content of the part of the protective gas is lost in the operation process, and the rest of the protective gas is directly combusted or exhausted to the atmosphere, so that not only is energy wasted, but also the part of the protective gas is very unsafe.
Disclosure of Invention
The invention aims to provide an energy-saving protective gas circulation system of a galvanizing continuous annealing furnace and a process thereof for solving the problems in the prior art; the technical scheme adopted for achieving the purpose is as follows:
an energy-saving type protective gas circulation system of a galvanizing continuous annealing furnace comprises the continuous annealing furnace, and also comprises an ammonia decomposition hydrogen production device, a PSA nitrogen production device and a nitrogen-hydrogen proportioning device, wherein a hydrogen purification device is arranged on an air outlet pipe of the ammonia decomposition hydrogen production device, a nitrogen purification device is arranged on an air outlet pipe of the PSA nitrogen production device, the air outlet pipes of the nitrogen purification device and the hydrogen purification device are correspondingly connected to two proportioning air inlets of the nitrogen-hydrogen proportioning device, an air outlet of the nitrogen-hydrogen proportioning device is connected to the continuous annealing furnace through a protective air pipe, and a tail gas recovery device is connected to a tail gas discharge pipe of the continuous annealing; the tail gas recovery device comprises a gas collecting tank, the tail gas discharge pipe is connected to the air inlet of the gas collecting tank, a recovery control valve group is installed on the tail gas discharge pipe, the gas collecting tank is sequentially connected with a first cooler, a condenser, an oil-gas separator, a fan supercharging device, an oil removing adsorber, an oil removing filter, a deaerator, a second cooler, an adsorption dryer and a pressure regulating device through a vent pipe, and the outlet pipe of the pressure regulating device is connected to a protection air pipe.
Preferably, the outlet of the PSA nitrogen production device is provided with a flow meter and a purity analyzer, and the PLC programming control system acquires signals of the flow meter and the purity analyzer to control the working period of the PSA nitrogen production device.
Preferably, the continuous annealing furnace is a gas furnace, a gas inlet pipe for combustion is arranged on the gas furnace, and an air inlet pipe for feeding air is arranged on the gas inlet pipe; the nitrogen purification device comprises a nitrogen purification device, wherein an oxygen-enriched tail gas recovery device is connected between a tail gas outlet pipe and an air inlet pipe of the nitrogen purification device, the oxygen-enriched tail gas recovery device comprises a main pipeline, a recovery/evacuation switching valve set is arranged on the main pipeline, then the main pipeline is divided into a first branch pipeline and a second branch pipeline, the first branch pipeline is connected with a pressurization front tank, the second branch pipeline is connected with a pressurization rear tank, a pressure transmitter is arranged on the pressurization front tank, a Roots blower is connected to the rear of the pressurization front tank, the Roots blower pressurizes the oxygen-enriched tail gas in the pressurization front tank and then sends the oxygen-enriched tail gas into the pressurization rear tank, a pressure stabilizing valve set and oxygen content detection are arranged on the outlet pipe.
Preferably, a check valve and a check valve are installed on the outlet line of the pressurized rear tank.
An energy-saving protective gas circulation process of a galvanizing continuous annealing furnace comprises the following circulation sequence: the tail gas of continuous annealing stove at first concentrates and collects and gets into the gas collection tank through retrieving the control valves, then the cooling deoiling through first cooler and condenser, get into oil and gas separator, get into the two-stage degree of depth deoiling that deoils adsorber and deoiling filter after the roots fan pressure boost again, then get into the oxygen-eliminating device deoxidization, second cooler cooling, the condenser condensation dewatering, it goes out water to get into the absorption desicator degree of depth, gas after the purification lets in the gas protection pipe after the pressure regulating device pressure regulating and supplies continuous annealing stove to use, accomplish the recovery cyclic utilization of the tail gas of continuous annealing stove.
Preferably, the tail gas of the PSA nitrogen making device is divided into two paths which respectively enter a first branch pipeline and a second branch pipeline, the first branch pipeline is connected with a pressurization front tank, the second branch pipeline is connected with a pressurization rear tank, a pressure transmitter is arranged on the pressurization front tank, a Roots blower is connected with the rear of the pressurization front tank, the Roots blower pressurizes the oxygen-enriched tail gas in the pressurization front tank and then sends the oxygen-enriched tail gas into the pressurization rear tank, a pressure stabilizing valve group and oxygen content detection are arranged on an outlet pipeline of the pressurization rear tank, and an outlet pipeline of the pressurization rear tank is connected with an air inlet pipe.
The invention has the following beneficial effects: (1) according to the invention, the tail gas recovery device is adopted to recycle the tail gas of the continuous annealing furnace, so that the consumption of the protective gas can be reduced by more than 80%, thus reducing resource waste and tail gas emission; (2) the PSA nitrogen making machine and the nitrogen purification device are improved to be suitable for running under the working condition of small flow, the power consumption of the air compressor is saved by 30-50%, and the PSA nitrogen making machine and the nitrogen purification device are also better suitable for the work of the tail gas recovery device, so that the power consumption is further saved; (3) for a gas heating furnace, an oxygen-enriched tail gas recovery device of a nitrogen making machine is added and connected to a heating furnace combustion system for oxygen-enriched combustion, so that the gas consumption is saved, and the resource waste is reduced, thereby realizing an energy-saving protective gas circulation system of a galvanizing continuous annealing furnace and a process thereof.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, an energy-saving protective gas circulation system of a zinc-plating continuous annealing furnace comprises a continuous annealing furnace 13, and further comprises an ammonia decomposition hydrogen production device 3, a PSA nitrogen production device 2 and a nitrogen-hydrogen proportioning device 6, wherein a hydrogen purification device 4 is arranged on an outlet pipe of the ammonia decomposition hydrogen production device 3, a nitrogen purification device 1 is arranged on an outlet pipe of the PSA nitrogen production device 2, outlet pipes of the nitrogen purification device 1 and the hydrogen purification device 4 are correspondingly connected to two proportioning gas inlets of the nitrogen-hydrogen proportioning device 6, a gas outlet of the nitrogen-hydrogen proportioning device 6 is connected to the continuous annealing furnace 13 through a protective gas pipe 9, and a tail gas recovery device 15 is connected to a tail gas discharge pipe 14 of the continuous annealing furnace 13; tail gas recovery unit 15 includes the gas collecting tank, tail gas discharge connects on the air inlet of gas collecting tank, installs recovery valve unit on the tail gas discharge, the gas collecting tank has connected gradually first cooler, condenser, oil and gas separator, fan supercharging device, deoiling adsorber, deoiling filter, oxygen-eliminating device, second cooler, adsorption drier and pressure regulating device through the breather pipe, and pressure regulating device's outlet duct 16 is connected on protection trachea 9, and installation control flap 8 is gone up on protection trachea 9 simultaneously, and control flap 8 is located the outlet duct 16 and inserts before protection trachea 9 position point.
When the continuous annealing furnace 13 adopts the tail gas recovery device 15, the actual gas output of the PSA nitrogen making device is only 20% -50% of the original gas amount, and under the condition of small flow, the unit nitrogen making cost can be increased by 30% -60%; therefore, in this embodiment, the PSA nitrogen generator employs a KRN type energy saving control system. Thereby reducing the unit nitrogen gas production cost to a normal level; further optimizes the nitrogen making process, and makes the energy consumption lower than the normal level by more than 15%. The pressure equalizing process of pressure swing adsorption is optimized, so that the pressure equalizing process is stable and controllable. The nitrogen-rich gas in the tower can be fully utilized, and the impact of the atmospheric flow on the carbon molecular sieve under high pressure difference during pressure equalization is effectively reduced; and the problem of mutual pressure equalization and unbalance between the two towers is solved. The purging and boosting processes are optimized, the emission of qualified nitrogen is reduced, and the influence of pressure fluctuation on the nitrogen purity is reduced.
The above is applicable to an electric furnace, when the continuous annealing furnace 13 is a gas furnace, a gas inlet pipe 12 for combustion may be provided on the gas furnace, and an air inlet pipe 11 for feeding air is provided on the gas inlet pipe 12; be connected with oxygen boosting tail gas recovery unit 7 between nitrogen gas purification device 1's tail gas outlet pipe and air advance pipe 11, oxygen boosting tail gas recovery unit 7 include with the main line, be equipped with on the main line retrieve/evacuation switching valves then the main line divide into first branch pipeline and second branch pipeline, first branch pipeline has connect the preceding jar of pressure boost, the second branch pipeline has connect the pressure boost rear tank, be equipped with pressure transmitter before the pressure boost on the jar, be connected with the roots blower before the pressure boost at the jar back, the roots blower sends into the pressure boost rear tank after with the pressure boost in the oxygen boosting tail gas pressure boost in the jar before the pressure boost in, install steady voltage valves and oxygen content detection on the outlet pipe way of pressure boost rear tank, and the outlet pipe way 10 of pressure boost rear tank is connected with air advances pipe 11, installs stop valve and check valve on the outlet.
An energy-saving protective gas circulation process of a galvanizing continuous annealing furnace comprises the following circulation sequence: the tail gas of continuous annealing furnace 13 is at first concentrated to be collected and gets into the gas collection tank through retrieving the control valves, then through the cooling deoiling of first cooler and condenser, get into oil and gas separator, get into the two-stage degree of depth deoiling of deoiling adsorber and deoiling filter after the roots's fan pressure boost again, then get into the oxygen-eliminating device deoxidization, second cooler cooling, the condenser condensation dewatering, it goes out water to get into the absorption desicator degree of depth, gas after the purification lets in the gas protection pipe after the pressure regulating device pressure regulating and supplies the continuous annealing furnace to use, accomplish the recovery cyclic utilization of the tail gas of continuous annealing furnace.
When the continuous annealing furnace 13 is a gas furnace, the tail gas of the PSA nitrogen making device is divided into two paths which respectively enter a first branch pipeline and a second branch pipeline, the first branch pipeline is connected with a pressurization front tank, the second branch pipeline is connected with a pressurization rear tank, a pressure transmitter is arranged on the pressurization front tank, a Roots blower is connected with the rear of the pressurization front tank, the Roots blower pressurizes the oxygen-enriched tail gas in the pressurization front tank and then sends the oxygen-enriched tail gas into the pressurization rear tank, a pressure stabilizing valve set and oxygen content detection are arranged on an outlet pipeline of the pressurization rear tank, and an outlet pipeline 10 of the pressurization rear tank is connected with an air inlet pipe 11.
Wherein, PSA nitrogen plant's pressure swing adsorption nitrogen generation principle does: generally, two adsorption towers are adopted for alternate adsorption and regeneration, so that continuous qualified nitrogen can be obtained and used after pressure fluctuation is stabilized by a nitrogen buffer tank. The pressure swing adsorption process comprises four steps:
adsorption: the adsorption tower filled with carbon molecular sieve has tower A and tower B, and when clean compressed air enters tower A and flows through carbon molecular sieve to outlet end, O is introduced into tower A2、CO2And H2O is adsorbed, and product nitrogen flows out from an outlet of the adsorption tower.
Pressure equalizing: after a period of time (about 1 minute or so), the carbon molecular sieve in column a is saturated. At the moment, the tower A automatically stops adsorption, and a short pressure equalizing process is carried out on the tower B, so that the pressure of the tower B is rapidly increased, and the aim of improving the nitrogen production efficiency is fulfilled. The pressure equalization means that two towers are communicated, so that the gas of the tower (i.e. the tower to be desorbed) which finishes the adsorption process flows to the other tower (i.e. the tower to be adsorbed), and finally, the gas pressure of the two towers is basically equalized.
Desorbing: after the pressure equalization is finished, the residual gas in the tower A is discharged through a desorption gas discharge port, and the pressure in the adsorption tower is rapidly reduced to the normal pressure, so that the adsorbed O is removed2、CO2、H2And O, realizing desorption and regeneration of the molecular sieve.
Purging and boosting pressure: in order to completely regenerate the molecular sieve, the column A is subjected to countercurrent purging by using qualified nitrogen in the nitrogen buffer tank, meanwhile, the pressure in the column to be adsorbed is further increased, and the compressed air at the other end of the adsorption column enters to establish necessary pressure for the next adsorption nitrogen production process.
The KRN type energy-saving control system who adopts is equipped with flowmeter and purity analyzer at PSA nitrogen plant export, and when outlet flow became little, nitrogen gas purity can rise, and when outlet flow became big, nitrogen gas purity can reduce. The KRN energy-saving control system is characterized in that a PLC (programmable logic controller) programming control system acquires signals of a flowmeter and a purity analyzer; 1. when the actual flow V is less than or equal to 0.8 times the rated flow Ve and the actual purity of the nitrogen is greater than the rated purity, the PLC can automatically prolong the working period of the nitrogen preparation device on the PSA through calculation to stabilize the actual purity of the nitrogen on the rated purity; thereby reducing the exhaust frequency of the nitrogen making machine and reducing the air consumption.
The PLC programming control system can also select a proper regulating speed according to the deviation coefficient of the actual flow and the rated flow, so that the nitrogen making machine can reach the most economic running state as soon as possible.
The PLC programming control system can also control the start and stop of the air compressor, the cold drying machine and the nitrogen making machine through the PLC according to the pressure of the nitrogen tank, and energy-saving control of discontinuous gas utilization occasions is achieved.
In addition, the control mode of the nitrogen purification device 1 also adopts time sequence control, and when the flow is reduced, the dryer starts to switch to work when the working load is not reached in a rated working period; the system also collects signals of the flowmeter through the PLC, and when the accumulated flow of the flowmeter reaches a rated value, switching is started, so that the regenerative heating power consumption and the loss of the regenerated gas can be effectively reduced.
The working principle of the nitrogen purification device 1 is as follows: generally, 2 dryers are adopted, one dryer normally works, the other dryer regenerates, and the dryers are controlled in a time sequence and switched to use, molecular sieves are arranged in the dryers, and the properties of the molecular sieves, such as large water absorption capacity at low temperature and small water absorption capacity at high temperature, are utilized. The regeneration gas is needed to carry out the water discharged by the molecular sieve during regeneration.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. An energy-saving type protective gas circulation system of a galvanizing continuous annealing furnace comprises the continuous annealing furnace and is characterized by further comprising an ammonia decomposition hydrogen production device, a PSA nitrogen production device and a nitrogen-hydrogen proportioning device, wherein a hydrogen purification device is arranged on an air outlet pipe of the ammonia decomposition hydrogen production device, a nitrogen purification device is arranged on an air outlet pipe of the PSA nitrogen production device, air outlet pipes of the nitrogen purification device and the hydrogen purification device are correspondingly connected to two proportioning gas inlets of the nitrogen-hydrogen proportioning device, a gas outlet of the nitrogen-hydrogen proportioning device is connected to the continuous annealing furnace through a protective gas pipe, and a tail gas recovery device is connected to a tail gas discharge pipe of the continuous annealing furnace; the tail gas recovery device comprises a gas collecting tank, the tail gas discharge pipe is connected to the air inlet of the gas collecting tank, a recovery control valve group is installed on the tail gas discharge pipe, the gas collecting tank is sequentially connected with a first cooler, a condenser, an oil-gas separator, a fan supercharging device, an oil removing adsorber, an oil removing filter, a deaerator, a second cooler, an adsorption dryer and a pressure regulating device through a vent pipe, and the outlet pipe of the pressure regulating device is connected to a protection air pipe.
2. The energy-saving protective gas circulation system of the galvanizing continuous annealing furnace according to claim 1, wherein the outlet of the PSA nitrogen making device is provided with a flow meter and a purity analyzer, and the PLC programming control system acquires signals of the flow meter and the purity analyzer to control the work cycle of the PSA nitrogen making device.
3. The energy-saving protective gas circulation system of the galvanizing continuous annealing furnace according to claim 1 or 2, characterized in that the continuous annealing furnace is a gas furnace, a gas inlet pipe for combustion is arranged on the gas furnace, and an air inlet pipe for feeding air is arranged on the gas inlet pipe; the nitrogen purification device comprises a nitrogen purification device, wherein an oxygen-enriched tail gas recovery device is connected between a tail gas outlet pipe and an air inlet pipe of the nitrogen purification device, the oxygen-enriched tail gas recovery device comprises a main pipeline, a recovery/evacuation switching valve set is arranged on the main pipeline, then the main pipeline is divided into a first branch pipeline and a second branch pipeline, the first branch pipeline is connected with a pressurization front tank, the second branch pipeline is connected with a pressurization rear tank, a pressure transmitter is arranged on the pressurization front tank, a Roots blower is connected to the rear of the pressurization front tank, the Roots blower pressurizes the oxygen-enriched tail gas in the pressurization front tank and then sends the oxygen-enriched tail gas into the pressurization rear tank, a pressure stabilizing valve set and oxygen content detection are arranged on the outlet pipe.
4. The energy-saving protective gas circulation system of the galvanizing continuous annealing furnace according to claim 3, wherein a stop valve and a check valve are installed on the outlet pipe of the pressurized post tank.
5. An energy-saving protective gas circulation process of a galvanizing continuous annealing furnace is characterized by comprising the following circulation sequence: the tail gas of continuous annealing stove at first concentrates and collects and gets into the gas collection tank through retrieving the control valves, then the cooling deoiling through first cooler and condenser, get into oil and gas separator, get into the two-stage degree of depth deoiling that deoils adsorber and deoiling filter after the roots fan pressure boost again, then get into the oxygen-eliminating device deoxidization, second cooler cooling, the condenser condensation dewatering, it goes out water to get into the absorption desicator degree of depth, gas after the purification lets in the gas protection pipe after the pressure regulating device pressure regulating and supplies continuous annealing stove to use, accomplish the recovery cyclic utilization of the tail gas of continuous annealing stove.
6. The energy-saving shielding gas circulation process of the continuous galvanizing annealing furnace as claimed in claim 5, wherein the tail gas of the PSA nitrogen making device is divided into two paths and enters a first branch pipeline and a second branch pipeline respectively, the first branch pipeline is connected with a pressurizing front tank, the second branch pipeline is connected with a pressurizing rear tank, a pressure transmitter is arranged on the pressurizing front tank, a Roots blower is connected behind the pressurizing front tank, the Roots blower pressurizes the oxygen-enriched tail gas in the pressurizing front tank and then sends the oxygen-enriched tail gas into the pressurizing rear tank, a pressure stabilizing valve group and an oxygen content detector are arranged on an outlet pipeline of the pressurizing rear tank, and the outlet pipeline of the pressurizing rear tank is connected with an air inlet pipe.
CN202011211752.4A 2020-11-03 2020-11-03 Energy-saving type protective gas circulation system of galvanizing continuous annealing furnace and process thereof Pending CN112143876A (en)

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