CN211261816U - Tail gas recovery processing and recycling device of galvanizing continuous annealing furnace - Google Patents
Tail gas recovery processing and recycling device of galvanizing continuous annealing furnace Download PDFInfo
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- CN211261816U CN211261816U CN201921672040.5U CN201921672040U CN211261816U CN 211261816 U CN211261816 U CN 211261816U CN 201921672040 U CN201921672040 U CN 201921672040U CN 211261816 U CN211261816 U CN 211261816U
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Abstract
The utility model relates to a zinc-plating continuous annealing stove tail gas recovery processing cyclic utilization device, tail gas recovery pipeline including connecting gradually, one-level turbocharging system, tail gas pretreatment systems, second grade turbocharging system, the oxygen-eliminating device, dewatering system in advance, adsorption drying system, the PLC controller of pressure regulating device one and power signal connection, dewatering system includes first cooler in advance, condenser and gas-water separator, tail gas recovery pipeline and tail gas blow-down pipe are parallelly connected on annealing stove tail gas outlet header pipe, adsorption drying system inserts annealing stove protection gas inlet header pipe through connecting pressure regulating device one afterwards, supply zinc-plated line annealing stove recycling. And finally, the tail gas is connected to an annealing furnace protective gas inlet main pipe through an adsorption drying system and a pressure adjusting device, and the treated tail gas is recycled by the annealing furnace of the galvanizing line. The device can reduce the protective gas consumption of the annealing furnace by more than 80 percent, reduce energy consumption, save cost for users, reduce the emission of industrial tail gas, realize cyclic utilization, save energy and protect environment.
Description
Technical Field
The utility model relates to a metallurgical industry annealing furnace production facility field, concretely relates to zinc-plating continuous annealing furnace tail gas recovery processing cyclic utilization device.
Background
At present, the protective gas for the continuous annealing furnace of the galvanizing line is mainly nitrogen-hydrogen mixed gas, and the tail gas is basically directly combusted or exhausted to the atmosphere, so that the energy is wasted and the method is unsafe. The continuous annealing furnace of the galvanizing line generally introduces the protective gas of nitrogen-hydrogen mixture. The hydrogen content of the protective gas is 5-30% different, the actual loss gas of the part of protective gas only has about 1% of hydrogen content loss in the actual operation process, and the rest of protective gas is directly burned or exhausted to the atmosphere. In view of this, the present invention provides a solution to the above-mentioned drawbacks of the prior art.
Therefore, it is of great significance to design and develop a device and a process capable of recycling most of the wasted shielding gas.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the tail gas recycling device for the galvanizing continuous annealing furnace is provided, the consumption of protective gas of the annealing furnace can be reduced by more than 80%, the energy consumption is reduced, the cost is saved for users, and the emission of industrial tail gas is reduced.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a tail gas recycling device of a galvanizing continuous annealing furnace comprises a tail gas recycling pipeline, a primary pressurizing system, a tail gas pretreatment system, a secondary pressurizing system, a deaerator, a pre-dewatering system, an adsorption drying system, a pressure regulating device I and a PLC (programmable logic controller), wherein the pre-dewatering system comprises a first cooler, a condenser and a gas-water separator, the middle of the first cooler is connected with a pipeline, the tail gas recycling pipeline and a tail gas blow-down pipe are connected on a tail gas outlet header pipe of the annealing furnace in parallel, the outlet of the tail gas recycling pipeline is connected with the front end of the primary pressurizing system, the rear end of the primary pressurizing system is connected with the front end of the tail gas pretreatment system, the rear end of the tail gas pretreatment system is connected with the front end of the secondary pressurizing system, the deaerator is connected with the gas outlet of the secondary pressurizing system, and the deaerator is connected with the first, the first cooler is connected with the condenser, the condenser is connected with the gas-water separator, the gas-water separator is connected with the adsorption drying system, and the adsorption drying system is connected with the annealing furnace protective gas inlet main pipe after being connected with the pressure regulating device I and is used for recycling of the annealing furnace of the galvanizing line; the PLC controller is respectively connected with an electric signal of the primary pressurizing system, the tail gas pretreatment system, the secondary pressurizing system, the deaerator, the pre-dewatering system, the adsorption drying system and the pressure adjusting device.
Preferably, a pressure transmitter and a hydrogen analyzer are arranged on the tail gas outlet main pipe of the annealing furnace, regulating valves are respectively arranged on the tail gas emptying pipeline and the tail gas recycling pipeline, and the pressure transmitter and the hydrogen analyzer on the tail gas outlet main pipe of the annealing furnace are connected with the regulating valves through a PLC (programmable logic controller).
Preferably, the primary pressurizing system comprises a second cooler, a tail gas collecting tank, 2 primary variable frequency superchargers which are connected in parallel and mutually stand-by, a pressurized buffer tank and an overpressure evacuation pipeline, and the inlet and the outlet of the primary pressurizing system are provided with stop valves and are provided with a nitrogen purging port and an evacuation port; a return pipeline is arranged at the inlet and the outlet of the first-stage frequency conversion supercharger, a pressure/flow regulating valve and a third cooler are arranged on the return pipeline, a pressure transmitter is respectively arranged at the inlet and the outlet of the first-stage frequency conversion supercharger, and a temperature transmitter is arranged at the outlet of the first-stage frequency conversion supercharger; and the pressure transmitter and the temperature transmitter are in electric signal connection with the first-stage variable frequency supercharger and the automatic control valve through the PLC.
Preferably, an emptying control valve is arranged on the overpressure emptying pipeline, and pressure transmitters at the inlet and the outlet of the first-stage variable frequency supercharger are connected with the emptying control valve through a PLC (programmable logic controller) in an electric signal mode.
Preferably, the tail gas pretreatment system comprises an adsorption oil removal device and a filtration dust removal oil removal device, the adsorption oil removal device comprises 2 groups of oil absorbers, a heater and corresponding valves, wherein a differential pressure gauge is arranged on each oil absorber, a thermal resistor is arranged on a regeneration outlet pipeline of each oil absorber, and the filtration dust removal oil removal device comprises 2 groups of dust removal oil removal filters and corresponding valves, wherein the dust removal oil removal filters are mutually spare and are provided with the differential pressure gauge.
Preferably, the secondary supercharging system consists of a pre-supercharging buffer tank, 2 secondary frequency conversion superchargers, a supercharged oil absorber and corresponding valves, wherein the 2 secondary frequency conversion superchargers are connected in parallel and are mutually standby, the inlet and the outlet of the secondary frequency conversion superchargers are provided with return pipelines, the return pipelines are provided with pressure/flow regulating valves and fourth coolers, the inlet and the outlet of the secondary frequency conversion superchargers are respectively provided with pressure transmitters, and the outlet of the secondary frequency conversion superchargers is provided with temperature transmitters; and the tail end of the secondary supercharging system is provided with an automatic control valve, and the pressure transmitter and the temperature transmitter are connected with the secondary variable frequency supercharger and the automatic control valve through a PLC (programmable logic controller). The buffer tank of the primary supercharging system is also connected with a sewage discharge pipeline, a sewage collection tank is arranged on the sewage discharge pipeline, control valves are respectively arranged at an inlet and an outlet of the sewage collection tank, a safe emptying device and a pressure transmitter are arranged at an outlet of the adsorption drying system, an automatic control valve and a pressure balance valve are arranged on the emptying device, and an outlet of the safe emptying pipe is connected with an emptying header pipe.
Preferably, the adsorption drying system at least comprises two adsorption dryers, and the adsorption dryers are internally provided with an oil removal adsorbent, an impurity removal adsorbent and a water removal adsorbent; the adsorption drying system is provided with two interfaces of nitrogen regeneration and self gas regeneration; a fifth cooler is arranged on the regeneration gas outlet pipeline, and then the fifth cooler is respectively connected to the front end of the dust and oil collecting device and the safety vent, and an automatic switching valve is arranged; a micro-oxygen analyzer and a dew point analyzer are arranged on an outlet pipeline of the adsorption drying system; the gas outlet pipeline is respectively connected to the self-circulation pipeline and the first pressure regulating device; a second pressure regulating device is arranged on the self-circulation pipeline; the first pressure regulating device comprises a buffer, a pressure regulating valve group, an air supplementing pipeline and a pressure transmitter; an automatic air supply valve is arranged on the air supply pipeline, and the pressure transmitter is connected with the automatic air supply valve through a PLC (programmable logic controller).
Through the technical scheme, the utility model utilizes the tail gas recycling device for the galvanizing continuous annealing furnace to remove most of oil stains in the tail gas after the tail gas generated by the galvanizing line continuous annealing furnace system passes through the cooler; then enters a tail gas pretreatment system through a primary pressurization system to further remove oil stains and dust in the tail gas and remove impurities such as residual ammonia, hydrocarbon and the like in the tail gas; secondly, the gas enters a secondary pressurization system for secondary pressurization, the pressurized gas firstly enters a deaerator to remove oxygen, then enters a pre-dewatering system, is cooled by a cooler, is condensed by a condenser, and is separated from water by a gas-water separator; and finally, the purified gas is subjected to pressure regulation by a pressure regulating device and then is sent into a galvanizing line continuous annealing furnace system to realize cyclic utilization. So just can reduce the protective gas quantity of annealing stove more than 80%, reduce energy resource consumption, for the user practices thrift the cost, reduces the emission of industry tail gas again, can bring certain economic benefits for this trade, accords with the energy-concerving and environment-protective political policy of national advocated again. Thereby the purposes of novel design, reasonable structure and good application effect are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a structural layout diagram of a recycling device for recycling tail gas of a galvanizing continuous annealing furnace, which is disclosed by the embodiment of the utility model.
The corresponding part names indicated by the numbers and letters in the drawings:
1. the system comprises a tail gas recovery pipeline 101, a pressure transmitter 2, a primary pressurization system 21, a second cooler 22, a tail gas collecting tank 23, a primary variable frequency supercharger 24, a pressurized rear buffer tank 25, an overpressure emptying pipeline 26, a third cooler 27, a sewage collecting tank 28, a primary fan 3, a tail gas pretreatment system 31, an adsorption deoiling device 32, a filtration dedusting deoiling device 311, an oil extractor 312, a heater 321, a dedusting deoiling filter 4, a secondary pressurization system 41, a pressurization front buffer tank 42, a secondary variable frequency supercharger 43, a pressurized rear oil extractor 44, a fourth cooler 45, a secondary fan 5, an deaerator 6, a pre-dewatering system 61, a first cooler 62, a condenser 63, a gas-water separator 7, an adsorption drying system 71, an emptying device 72, an adsorption dryer 73, a fifth cooler 74, a micro-oxygen analyzer 75, a dew point analyzer 8 and a pressure regulating device 8 The first 80, the second pressure adjusting device 81, the buffer 82, the pressure adjusting valve group 83, the nitrogen gas supplementing pipe 84, the hydrogen gas supplementing pipe 9, the PLC 10, the hydrogen analyzer 11, the tail gas emptying pipe 12, the tail gas outlet header pipe 13, the gas distributing device 14, the pressure adjusting valve station 15, the galvanizing continuous annealing furnace
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The present invention will be described in further detail with reference to examples and embodiments.
Examples are given.
As shown in figure 1, the tail gas recycling device for the galvanizing continuous annealing furnace comprises a tail gas recycling pipeline 1, a primary pressurizing system 2, a tail gas pretreatment system 3, a secondary pressurizing system 4, a deaerator 5, a pre-dewatering system 6, an adsorption drying system 7, a pressure regulating device I8 and a PLC (programmable logic controller) 9, wherein the pre-dewatering system 6 comprises a first cooler 61, a condenser 62 and a gas-water separator 63 which are connected with pipelines in the middle, the tail gas recycling pipeline 1 and a tail gas vent pipe 11 are connected on a tail gas outlet header pipe 12 of the annealing furnace in parallel, the outlet of the tail gas recycling pipeline 1 is connected with the front end of the primary pressurizing system 2, the rear end of the primary pressurizing system 2 is connected with the front end of the tail gas pretreatment system 3, the rear end of the tail gas pretreatment system 3 is connected with the front end of the secondary pressurizing system 4, the gas outlet of the secondary pressurizing system 4 is connected with the deaerator, the deaerator 5 is connected with a first cooler 61 of the pre-dewatering system 6, the first cooler 61 is connected with a condenser 62, the condenser 62 is connected with a gas-water separator 63, the gas-water separator 63 is connected with the adsorption drying system 7, and the adsorption drying system 7 is connected with a first pressure regulating device 8 and then is connected to an annealing furnace protective gas inlet main pipe 13 for recycling of a galvanizing line annealing furnace; the PLC 9 is respectively connected with the first-stage supercharging system 2, the tail gas pretreatment system 3, the second-stage supercharging system 4, the deaerator 5, the pre-dewatering system 6, the adsorption drying system 7 and the pressure adjusting device I8 through electric signals.
Wherein, be provided with pressure transmitter 101 and hydrogen on annealing stove tail gas export main line 12 and divide appearance 10 to all be equipped with the governing valve on tail gas blow-down pipeline 11 and tail gas recovery pipeline 1, pressure transmitter 101 and hydrogen on annealing stove tail gas export main line 12 divide appearance 10 to link to each other with the governing valve through PLC controller 9. The primary supercharging system 2 comprises a second cooler 21, a tail gas collecting tank 22, 2 primary variable frequency superchargers 23, a supercharged buffer tank 24 and an overpressure evacuation pipeline 25 which are connected in parallel and mutually stand-by, and the inlet and outlet of the primary supercharging system 2 are provided with stop valves and nitrogen purging ports and evacuation ports; a return pipeline is arranged at the inlet and the outlet of the first-stage frequency conversion supercharger 23, a pressure/flow regulating valve and a third cooler 26 are arranged on the return pipeline, a pressure transmitter is respectively arranged at the inlet and the outlet of the first-stage frequency conversion supercharger 23, and a temperature transmitter is arranged at the outlet of the first-stage frequency conversion supercharger 23; and the pressure transmitter and the temperature transmitter are in electric signal connection with the first-stage variable frequency supercharger 23 and the automatic control valve through the PLC 9. An emptying control valve is arranged on the overpressure emptying pipeline 25, and pressure transmitters at the inlet and the outlet of the first-stage variable frequency supercharger 23 are connected with the emptying control valve through a PLC (programmable logic controller) 9 through electric signals. The tail gas pretreatment system 3 comprises an adsorption oil removal device 31 and a filtering dust removal oil removal device 32, the adsorption oil removal device 31 comprises 2 groups of oil absorbers 311, a heater 312 and corresponding valves, wherein a differential pressure gauge is arranged on the oil absorber 311, a thermal resistor is arranged on a regeneration outlet pipeline of the oil absorber 311, the filtering dust removal oil removal device 32 comprises 2 groups of dust removal oil removal filters 321 and corresponding valves, the dust removal oil removal filters 321 are mutually spare, and the pressure difference gauge is arranged. The two-stage supercharging system 4 consists of a supercharging front buffer tank 41, 2 two-stage frequency conversion superchargers 42, a supercharging rear oil absorber 43 and corresponding valves, wherein the 2 two-stage frequency conversion superchargers 42 are connected in parallel and are mutually standby, a return pipeline is arranged at an inlet and an outlet of the two-stage frequency conversion superchargers 4, a pressure/flow regulating valve and a fourth cooler 44 are arranged on the return pipeline, pressure transmitters are respectively arranged at the inlet and the outlet of the two-stage frequency conversion superchargers 42, and a temperature transmitter is arranged at the outlet of the two-stage frequency conversion superchargers; an automatic control valve is arranged at the tail end of the two-stage supercharging system 4, and the pressure transmitter and the temperature transmitter are connected with the two-stage frequency conversion supercharger 42 and the automatic control valve through the PLC 9. The buffer tank 24 of the primary supercharging system 2 is also connected with a sewage discharge pipeline, the sewage discharge pipeline is provided with a sewage collection tank 27, the inlet and the outlet of the sewage collection tank 27 are respectively provided with a control valve, the outlet of the adsorption drying system 7 is provided with a safe emptying device 71 and a pressure transmitter, the emptying device 71 is provided with an automatic control valve and a pressure balance valve, and the outlet of the safe emptying pipe is connected with an emptying header pipe at the position. The adsorption drying system 7 at least comprises two adsorption dryers 72, and the adsorption dryers 72 are internally provided with an oil removal adsorbent, an impurity removal adsorbent and a water removal adsorbent; the adsorption drying system 7 is provided with two interfaces of nitrogen regeneration and self gas regeneration; a fifth cooler 73 is arranged on the regeneration gas outlet pipeline and is respectively connected to the front end of the dust and oil collecting device 32 and the safety vent, and an automatic switching valve is arranged; a micro-oxygen analyzer 74 and a dew point analyzer 75 are arranged on an outlet pipeline of the adsorption drying system 7; the gas outlet pipeline is respectively connected to the self-circulation pipeline and the first pressure regulating device 8; a second pressure regulating device 80 is arranged on the self-circulation pipeline; the first pressure regulating device 8 comprises a buffer 81, a pressure regulating valve group 82, a gas supplementing pipeline and a pressure transmitter; the gas supplementing pipeline comprises a nitrogen gas supplementing pipe 83 and a hydrogen gas supplementing pipe 84, an automatic gas supplementing valve is arranged on the gas supplementing pipe, nitrogen gas and hydrogen gas respectively pass through the nitrogen gas supplementing pipe 83 and the hydrogen gas supplementing pipe 84 and then enter the gas distribution device 13 through pressure regulation, finally enter the galvanizing continuous annealing furnace 15 through the pressure regulating valve station 14 and are reused, and a pressure transmitter is also connected with the automatic gas supplementing valve through the PLC 9.
The working principle of the technical scheme is as follows: a pressure transmitter and a hydrogen analyzer 10 are arranged on a tail gas outlet main pipe 12 of a galvanizing continuous annealing furnace 15. Control valves are arranged on the tail gas emptying pipe 11 and the tail gas recovery pipeline 1, when the galvanizing continuous annealing furnace is in emptying operation, the tail gas emptying control valve is opened, the tail gas recovery control valve is closed, and the opening degree of the tail gas emptying control valve can be automatically adjusted according to the pressure value. When the annealing furnace is in recovery operation, the tail gas recovery control valve is opened, the tail gas emptying control valve is closed, and the opening of the tail gas recovery control valve can be automatically adjusted according to the pressure value. When the pressure of the system is limited, the tail gas emptying control valve is opened, and the gas is emptied through the tail gas emptying control valve. The system can automatically select whether to recover or vent according to the hydrogen content in the tail gas.
The primary pressurizing system 2 can reduce the temperature of the tail gas to be below 12 ℃ through the second cooler 21, and remove most of oil stains in the tail gas; the tail gas collecting tank 22 plays a role in stabilizing pressure, and the primary variable frequency supercharger 23 can automatically adjust the pressure in front of and behind the fan; the device is also provided with an over-temperature alarm control, and an automatic stop valve is arranged at the outlet and can be used as safety protection when the primary fan 28 is started and stopped; the primary fan 28 bypasses the return valve and returns air from the outlet of the primary fan 28 to the inlet of the primary fan 28 when the pressure at the inlet of the primary fan 28 is below a set value. And the stable operation of the system is ensured.
The tail gas pretreatment system 3 can deeply remove oil and most CO through the adsorption oil removal device 312And long chain hydrocarbon, etc., the oil extractor 311 has 2 groups, one group works normally, one group regenerates, can switch over automatically, use continuously, the regeneration of the oil extractor 311 is usually regenerated by nitrogen, can discharge oil and impurity gas in the system to the outside of the system effectively; the inlet and outlet of the oil extractor 311 are provided with a differential pressure gauge, when the differential pressure is large, the oil extractor 311 can be reminded to maintain; and the stable operation of the adsorption oil removal device 31 is ensured.
The inlet and outlet of the filtering, dedusting and oil removing device 32 are provided with a cut-off valve and are provided with a nitrogen purging port and an evacuation port. And the maintenance is convenient. A two-stage filtering dust and oil removing device 32 is arranged, and the dust and the oil stains in the tail gas are removed by adopting the filtering principle.
The filtering, dust-removing and oil-removing device 32 is provided with two sets which are connected in parallel and are mutually standby. The normal operation of the tail gas recovery, purification and circulation device of the galvanizing continuous annealing furnace system is prevented from being influenced when one set of the annealing furnace system is broken or maintained.
The secondary supercharging system 4 is provided with a secondary frequency conversion supercharger 42, and the pressure of the secondary frequency conversion supercharger 42 can be automatically adjusted through a secondary fan 45; the device is also provided with an over-temperature alarm control, and an automatic stop valve is arranged at the outlet and can be used for safety protection when the secondary fan 45 is started and stopped; the second-stage fan 45 bypasses the return valve, and when the pressure at the inlet of the second-stage fan 45 is lower than a set value, air returns from the outlet of the second-stage fan 45 to the inlet of the second-stage fan 45. And the stable operation of the system is ensured.
The sewage discharge pipeline is provided with a sewage collection tank 27, the inlet and outlet of the sewage collection tank 27 are respectively provided with a control valve, the outlet of the adsorption drying system 7 is provided with a safe emptying device 71 and a pressure transmitter, the emptying device 71 is provided with an automatic control valve and a pressure balance valve, and the outlet of the safe emptying pipe is connected with an emptying header pipe.
The adsorption drying system 7 at least comprises two adsorption dryers 72, and the adsorption dryers 72 are filled with an oil removal adsorbent, an impurity removal adsorbent and a water removal adsorbent; the adsorption drying system 7 is provided with two interfaces of nitrogen regeneration and self gas regeneration; a fifth cooler 73 is arranged on the regeneration gas outlet pipeline, and then the fifth cooler is respectively connected to the front part of the secondary supercharging system 4 and the safety vent, and an automatic switching valve is arranged; a micro-oxygen analyzer 74 and a dew point analyzer 75 are arranged on an outlet pipeline of the adsorption drying system 7; the gas outlet pipeline is respectively connected to the self-circulation pipeline and the first pressure regulating device 8; a second pressure regulating device 80 is arranged on the self-circulation pipeline; the first pressure regulating device 8 comprises a buffer 81, a pressure regulating valve group 82, a gas supplementing pipeline, a pressure transmitter and a hydrogen analyzer 10; an automatic air supply valve is arranged on the air supply pipeline, and the pressure transmitter and the hydrogen analyzer 10 are connected with the automatic air supply valve through a PLC 9. The adsorption drying system 7 can deeply adsorb water and CO contained in the gas2And short chain hydrocarbons, and the like, and can discharge impurities out of the system, and when the micro-oxygen analyzer 74 and the dew point analyzer 75 detect that the gas is unqualified, the gas is passed to the front stage through the second pressure regulating device 80 to be purified again. The first pressure regulating device 8 is provided with a buffer 81 which can reduce the pressure fluctuation of the system, and an air supply pipeline is arranged, so that air can be automatically supplied when the system pressure is low, and the air supply pressure is ensured; with self-forceThe pressure regulating valve can regulate the air inlet pressure of the continuous galvanizing annealing furnace.
In this embodiment, the utility model utilizes the tail gas recycling device for the galvanizing continuous annealing furnace to remove most of the oil stains in the tail gas generated by the galvanizing line continuous annealing furnace system after passing through the cooler; then enters a tail gas pretreatment system through a primary pressurization system to further remove oil stains and dust in the tail gas and remove impurities such as residual ammonia, hydrocarbon and the like in the tail gas; secondly, the gas enters a secondary pressurization system for secondary pressurization, the pressurized gas firstly enters a deaerator to remove oxygen, then enters a pre-dewatering system, is cooled by a cooler, is condensed by a condenser, and is separated from water by a gas-water separator; and finally, the purified gas is subjected to pressure regulation by a pressure regulating device and then is sent into a galvanizing line continuous annealing furnace system to realize cyclic utilization. So just can reduce the protective gas quantity of annealing stove more than 80%, reduce energy resource consumption, for the user practices thrift the cost, reduces the emission of industry tail gas again, can bring certain economic benefits for this trade, accords with the energy-concerving and environment-protective political policy of national advocated again. Thereby the purposes of novel design, reasonable structure and good application effect are achieved.
What has just been said above is the preferred embodiment of the utility model discloses a zinc-plated continuous annealing stove tail gas recovery processing cyclic utilization device, should point out, to the ordinary skilled person in this field, under the prerequisite that does not deviate from the utility model discloses the inventive concept can also make a plurality of deformations and improvements, and these all belong to the utility model discloses a protection scope.
Claims (7)
1. The utility model provides a zinc-plating continuous annealing stove tail gas recovery processing cyclic utilization device which characterized in that: comprises a tail gas recovery pipeline, a primary pressurizing system, a tail gas pretreatment system, a secondary pressurizing system, a deaerator, a pre-dewatering system, an adsorption drying system, a pressure regulating device I and a PLC controller, wherein the pre-dewatering system comprises a first cooler, a condenser and a gas-water separator which are connected with pipelines in the middle, the tail gas recovery pipeline and a tail gas blow-down pipe are connected on a tail gas outlet header pipe of an annealing furnace in parallel, the outlet of the tail gas recovery pipeline is connected with the front end of the primary pressurizing system, the rear end of the primary pressurizing system is connected with the front end of the tail gas pretreatment system, the rear end of the tail gas pretreatment system is connected with the front end of the secondary pressurizing system, a gas outlet of the secondary pressurizing system is connected with the deaerator, the deaerator is connected with the first cooler of the pre-dewatering system, the first cooler is connected with the condenser, and the condenser is connected, the gas-water separator is connected with the adsorption drying system, and the adsorption drying system is connected with the annealing furnace protective gas inlet main pipe after being connected with the pressure regulating device I and is used for recycling of the annealing furnace of the galvanizing line; the PLC controller is respectively connected with an electric signal of the primary pressurizing system, the tail gas pretreatment system, the secondary pressurizing system, the deaerator, the pre-dewatering system, the adsorption drying system and the pressure adjusting device.
2. The tail gas recycling device for the galvanizing continuous annealing furnace according to claim 1, wherein a pressure transmitter and a hydrogen analyzer are arranged on the tail gas outlet main pipe of the annealing furnace, regulating valves are respectively arranged on the tail gas emptying pipeline and the tail gas recovery pipeline, and the pressure transmitter and the hydrogen analyzer on the tail gas outlet main pipe of the annealing furnace are connected with the regulating valves through a PLC (programmable logic controller).
3. The tail gas recycling device for the galvanizing continuous annealing furnace according to claim 2, wherein the primary pressurizing system comprises a second cooler, a tail gas collecting tank, 2 primary variable-frequency superchargers which are connected in parallel and mutually stand-by, a pressurized buffer tank and an overpressure evacuation pipeline, and the inlet and the outlet of the primary pressurizing system are provided with stop valves and are provided with a nitrogen purging port and an evacuation port; a return pipeline is arranged at the inlet and the outlet of the first-stage frequency conversion supercharger, a pressure/flow regulating valve and a third cooler are arranged on the return pipeline, a pressure transmitter is respectively arranged at the inlet and the outlet of the first-stage frequency conversion supercharger, and a temperature transmitter is arranged at the outlet of the first-stage frequency conversion supercharger; and the pressure transmitter and the temperature transmitter are in electric signal connection with the first-stage variable frequency supercharger and the automatic control valve through the PLC.
4. The recycling device for the tail gas of the galvanizing continuous annealing furnace according to claim 3, wherein an emptying control valve is arranged on the overpressure emptying pipeline, and pressure transmitters at the inlet and the outlet of the primary variable frequency supercharger are connected with the emptying control valve through electrical signals of a PLC (programmable logic controller).
5. The recycling device for recycling exhaust gas of a galvanizing continuous annealing furnace according to claim 4, wherein the exhaust gas pretreatment system comprises an adsorption oil removal device and a filtration dust and oil removal device, the adsorption oil removal device comprises 2 sets of oil extractors, heaters and corresponding valves, a pressure difference meter is arranged on each oil extractor, a thermal resistor is arranged on a regeneration outlet pipeline of each oil extractor, and the filtration dust and oil removal device comprises 2 sets of dust and oil removal filters and corresponding valves, wherein the dust and oil removal filters are mutually spare and are provided with the pressure difference meter.
6. The recycling device for recycling tail gas of the galvanizing continuous annealing furnace according to claim 5, wherein the secondary supercharging system comprises a pre-supercharging buffer tank, 2 secondary frequency conversion superchargers, a post-supercharging oil extractor and corresponding valves, wherein the 2 secondary frequency conversion superchargers are connected in parallel and are mutually standby, return pipelines are arranged at the inlet and the outlet of the secondary frequency conversion superchargers, pressure/flow regulating valves and fourth coolers are arranged on the return pipelines, pressure transmitters are respectively arranged at the inlet and the outlet of the secondary frequency conversion superchargers, and temperature transmitters are arranged at the outlet of the secondary frequency conversion superchargers; an automatic control valve is arranged at the tail end of the secondary supercharging system, and the pressure transmitter and the temperature transmitter are connected with the secondary variable frequency supercharger and the automatic control valve through a PLC (programmable logic controller); the buffer tank of the primary supercharging system is also connected with a sewage discharge pipeline, a sewage collection tank is arranged on the sewage discharge pipeline, control valves are respectively arranged at an inlet and an outlet of the sewage collection tank, a safe emptying device and a pressure transmitter are arranged at an outlet of the adsorption drying system, an automatic control valve and a pressure balance valve are arranged on the emptying device, and an outlet of the safe emptying pipe is connected with an emptying header pipe.
7. The recycling device for recycling the tail gas of the galvanizing continuous annealing furnace according to claim 6, wherein the adsorption drying system at least comprises two adsorption dryers, and the adsorption dryers are filled with an oil removal adsorbent, an impurity removal adsorbent and a water removal adsorbent; the adsorption drying system is provided with two interfaces of nitrogen regeneration and self gas regeneration; a fifth cooler is arranged on the regeneration gas outlet pipeline, and then the fifth cooler is respectively connected to the front end of the dust and oil collecting device and the safety vent, and an automatic switching valve is arranged; a micro-oxygen analyzer and a dew point analyzer are arranged on an outlet pipeline of the adsorption drying system; the gas outlet pipeline is respectively connected to the self-circulation pipeline and the first pressure regulating device; a second pressure regulating device is arranged on the self-circulation pipeline; the first pressure regulating device comprises a buffer, a pressure regulating valve group, an air supplementing pipeline and a pressure transmitter; an automatic air supply valve is arranged on the air supply pipeline, and the pressure transmitter is connected with the automatic air supply valve through a PLC (programmable logic controller).
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| CN110595221A (en) * | 2019-10-08 | 2019-12-20 | 江苏维麦气体科技有限公司 | Tail gas recycling device and process for galvanizing continuous annealing furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595221A (en) * | 2019-10-08 | 2019-12-20 | 江苏维麦气体科技有限公司 | Tail gas recycling device and process for galvanizing continuous annealing furnace |
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