CN105665714A - Safe, environment-friendly and efficient catalytic degreasing furnace and process thereof - Google Patents
Safe, environment-friendly and efficient catalytic degreasing furnace and process thereof Download PDFInfo
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- CN105665714A CN105665714A CN201610069789.5A CN201610069789A CN105665714A CN 105665714 A CN105665714 A CN 105665714A CN 201610069789 A CN201610069789 A CN 201610069789A CN 105665714 A CN105665714 A CN 105665714A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
Abstract
The invention relates to the technical field of catalytic degreasing, in particular to a safe, environment-friendly and efficient catalytic degreasing furnace and process thereof, and discloses a process using the catalytic degreasing furnace. The catalytic degreasing furnace comprises a frame and a catalytic furnace; a weighing frame is suspended in the frame, and is connected with the frame through a weighing module; the catalytic furnace is fixedly mounted on the weighing frame; a tail gas recovery device is arranged on the frame; and the catalytic furnace is provided with a tail gas pipe connected with the tail gas recovery device. The catalytic degreasing furnace is reasonable in structure setting, is safe and reliable, has no open flame in the degreasing tail gas treatment process to prevent the flammable and explosive risk of formaldehyde, discharges no carbon dioxide and nitrogen dioxide in the treated tail gas, reduces the emission of greenhouse gas, can monitor the degreasing process in real time, shortens the production period and the auxiliary consumption, effectively improves the production efficiency and the degreasing quality, and reduces the production cost.
Description
Technical field
The present invention relates to catalytic degreasing technical field, specifically refer to a kind of safety and environmental protection efficient catalytic debinding furnace, also disclose the technique using this catalytic degreasing stove.
Background technology
Powder injection-molded (PowderInjectionMolding, it is abbreviated as PIM) by metal powder injection molding (MetalInjectionMolding, it is abbreviated as MIM) and ceramic powder injection molding (CeramicsInjectionMolding, it is abbreviated as CIM) two portions composition, it is the Novel powder metallurgy near-net-shape technology that modern plastics injection molding technology is incorporated into field of powder metallurgy and formed. The typical process flow of PIM is: choose the metal or ceramic powder and binding agent that meet PIM processing requirement, then at a certain temperature powder and binding agent are mixed into uniform feeding, after granulating, under heating plasticizing state, (～150 DEG C) inject shaping in mold cavity with injection moulding machine and obtain into parison (GreenPart), recycling chemistry or thermolysis process take off the binding agent removing in parison, and last sintering densification becomes final finished (WhitePart).
The key of PIM technology is binding agent removing process (also known as degreasing process), in industrial production, the degreasing process of main application has: thermal debinding, solvent degreasing, catalytic degreasing, the Metamold catalytic degreasing method that wherein early 1990s BASF company develops is the PIM degreasing method that to be applied in industrial production at present most advanced, and its main technical principle adopts polyoxymethylene as main binder and fast catalytic pyrolysis becomes formaldehyde gas and reach the de-effect except binding agent fast in the acid atmosphere of nitric acid or oxalic acid.
Existing catalytic degreasing stove runs step:
1. by the rotation of multiblade formula centrifugal wind wheel and burner hearth heats to 110 DEG C～150 DEG C to dynamic motor, lead to into pressurized air and liquefied petroleum gas (LPG) or natural gas fired burning, discharge in air after exhaust pipeline expellant gas is burnt, lead to nitrogen the air in burner hearth is all blown by exhaust pipeline to drive out of outside burner hearth simultaneously, nitrogen flow manual valve or electrical servo valve regulated, gas meter detection flow.
2. burner hearth constant temperature, nitrogen continues to lead in burner hearth, until the air in burner hearth all blow catch up with clean after (time that this process needs be at present calculated by equipment de-sign and go bail for and keep value and determine), start to lead to into nitric acid or oxalic acid, nitric acid or oxalic acid flow are by acid pump speed adjustment, nitric acid or oxalic acid are vaporized into gas and flow to and treat degreasing piece surface, catalyzed reaction is carried out with the polyoxymethylene binding agent treated in degreasing part, polyoxymethylene is cracked into formaldehyde gas with the air current flow in burner hearth to exhaust pipeline, discharges in air after burning.
3. burner hearth continues constant temperature, after the whole cracking of polyoxymethylene binding agent in degreasing part is complete (time that this chemical reaction process needs undertaken estimating by the thickness of the material of knowhow, part, part, the part gross weight that loads at present determine), stop leading to into nitric acid or oxalic acid, now nitrogen continues to lead in burner hearth, and the nitric acid in burner hearth or oxalic acid steam, the formaldehyde gas that reflects are blown and arrive in exhaust pipeline burning.
4. the nitric acid in burner hearth or oxalic acid steam, formaldehyde gas are discharged after all burning after outside burner hearth (time that this process needs is calculated by equipment de-sign and go bail for and keep value and determine at present).
There is following shortcoming in this kind of catalytic degreasing stove and technique thereof:
1, potential safety hazard is big. Formaldehyde gas is gas inflammable and explosive, hypertoxic, and its steam and air form explosive mixture, and chance naked light, high heat energy cause combustion explosion, and at 110 DEG C～150 DEG C temperature, limits of explosion is 5.4%～40.2%. The formaldehyde gas of naked light combustion system process discharge taked by current catalytic degreasing stove, and up to the present the air content in burner hearth does not have other technologies to detect, equipment and liquefied petroleum gas (LPG) or natural gas storage tank, the use of transport pipe, operation, management is careless slightly easily causes an explosion accident.
2, environmental hazard is big, not environmentally. Burner hearth expellant gas has formaldehyde, nitric acid or oxalic acid steam, nitrogen, and after formaldehyde, oxalic acid, liquefied petroleum gas (LPG) or combustion of natural gas, become carbonic acid gas CO2 and water H2O, nitric acid becomes nitrogen peroxide NO2 and water H2O after burning, nitrogen peroxide NO2 can not be reduced to nitrogen N 2 and oxygen O2 by combustion system, wherein carbonic acid gas CO2 and nitrogen peroxide NO2 causes Greenhouse effect predominant gas, and not open close enter liquefied petroleum gas (LPG) or combustion of natural gas can increase carbon quantity discharged.
3, production cost height, efficiency are low. Owing to the air content in burner hearth can not be monitored, in order to guarantee that air can be got rid of completely, burner hearth often leads to for a long time into a large amount of nitrogen, greatly increases operation hours and nitrogen consumption; Meanwhile, the de-degree of removing of the binding agent in part cannot be monitored again, empirically adopts process the most conservative working time, add the various gas consumption such as nitric acid or oxalic acid, nitrogen, combustion gas, extend the production cycle, reduce production efficiency in production.
4, degreasing difficult quality guarantee, production process difficulty control. As above-mentioned, owing to degreasing degree, the degreasing speed of part can not detect, this can add production process parameters (such as nitric acid or oxalic acid transfer rate, nitrogen flow, multiblade formula centrifugal wind wheel rotating speed, degreasing time etc.) control difficulty, and then have impact on degreasing quality.
Therefore, prior art needs to improve.
Summary of the invention
It is an object of the invention to the defect for prior art and deficiency, it is provided that a kind of efficient catalytic degreasing stove of safety and environmental protection rational in infrastructure, easy to operate, that steady quality, production efficiency are high and technique thereof.
In order to realize above-mentioned purpose, the present invention by the following technical solutions:
A kind of efficient catalytic degreasing stove of safety and environmental protection of the present invention, comprises frame and catalyst furnace, unsettled in described frame is provided with frame of weighing, and frame of weighing is connected with frame by Weighing module, and catalyst furnace is fixedly mounted on and weighs on frame; Described frame is provided with device for recovering tail gas, and catalyst furnace is provided with the offgas duct being connected with device for recovering tail gas.
According to above scheme, described device for recovering tail gas comprises water tank, water power pump and relaying device, water tank is connected with for water valve and wash water valve, described relaying device is connected on the top board of water tank, and water power pump output terminal and offgas duct are connected with relaying device respectively, water power pump input terminus is connected on water tank.
According to above scheme, described relaying device comprises vacuum pump, and vacuum pump is fixedly connected on the top board of water tank, and the two ends of vacuum pump are connected with water power pump output terminal and water tank respectively; Being connected with vacuum breaker on described vacuum pump, vacuum breaker is connected with offgas duct.
According to above scheme, being provided with snubber in described water tank, the horn-like setting that snubber is big up and small down, and the lower port of snubber is located at below the working level of water tank, the upper port of snubber is connected with vacuum pump.
According to above scheme, a sidewall of described water tank being connected with overflow threeway, the level height of snubber lower port, lower than overflow threeway, the other two-port of overflow threeway is respectively equipped with waste pipe and upflow tube.
According to above scheme, the top board of described water tank is provided with circulating gas pipe, and circulating gas pipe two ends are joining water box and offgas duct respectively.
According to above scheme, a kind of efficient catalytic degreasing furnaceman's skill of safety and environmental protection, processing step is as follows:
A, first calculate and treat that the binding agent polyoxymethylene gross weight contained by degreasing part is J in catalyst furnace, show that the nitric acid dosage needed for degreasing reaction is X, the usage quantity of calcium hydroxide powder is C, drops into calcium hydroxide powder with the ratio of molar concentration rate J+X:C=1:1 in water tank; Open again and to water filling in water tank, liquid level and adverse current mouth are maintained an equal level for water valve, the pipe path started between water power pump, vacuum pump, water tank makes the water in water tank and calcium hydroxide powder fully stir 10-15 minute, and the PH value obtaining saturated aqua calcis and this solution is between 11-14;
B, start catalytic degreasing stove and make rise in temperature to 110 DEG C～150 DEG C in its burner hearth, give in catalyst furnace simultaneously and lead to nitrogen the air in burner hearth is discharged from offgas duct; Circulation path work between water power pump, vacuum pump, water tank makes offgas duct produce vacuum effect, thus the air discharged in catalyst furnace and nitrogen mixture body enter water tank from vacuum pump and make aqua calcis be heated to 50 DEG C-60 DEG C, this part mixed gas is discharged by overflow threeway and overflow threeway connects waste gas Sewage treatment systems respectively by waste pipe and upflow tube and carries out aftertreatment; Described catalyst furnace runs exists tolerance difference between the free air delivery of generation and the vacuum pump inspiratory capacity of water power pump driving, and this tolerance difference connects water tank by circulating gas pipe and waste pipe is balanced;
The burner hearth constant temperature of c, maintenance catalyst furnace, and add nitric acid or oxalic acid carries out degreasing reaction, the nitrogen that produces in skimming processes, nitric acid or oxalic acid steam, formaldehyde mix waste gas enter in water tank through vacuum pump and react, snubber outlet 400-500mm below aqua calcis liquid level in water tank of the lower end of vacuum pump, thus make mix waste gas and aqua calcis be able to abundant reaction;
D, said process being treated, the binding agent of the carrying out along with degreasing reaction of degreasing part on it constantly reduces, treat that the gross weight of degreasing part connects PLC control system monitoring by Weighing module, PLC control system regulates the transfer rate of nitric acid or oxalic acid, nitrogen flow, catalyst furnace inner blower rotating speed according to weight-loss curve change, to improve degreasing reaction effect; Cut off the supply of nitric acid or oxalic acid when weight-loss curve stops change by PLC control system time delay after 60 minutes, wait 90-120 minute with nitrogen by emptying to the nitric acid in catalyst furnace or oxalic acid steam, formaldehyde mix waste gas;
E, cooling of closing down catalyst furnace and make its normal temperature, cutting off nitrogen conveying, device for recovering tail gas continues to run 60-120 minute, finally by wash water valve, the solution in water tank is connected to waste gas Sewage treatment systems and carries out processing and discharge.
The useful effect of the present invention is: present configuration arranges rationally, safe and reliable, the inflammable and explosive risk of formaldehyde is avoided in the degreasing vent gas treatment process flames of anger, treated tail gas is without carbonic acid gas and emission of nitrogen oxide, reduce the discharge of greenhouse gases, can monitor in real time skimming processes, reduction production cycle and auxiliary agent consumption, effectively improve production efficiency and degreasing quality, reduce production cost.
Accompanying drawing explanation
The entirety that Fig. 1 is the present invention faces structural representation;
Fig. 2 is the perspective view structural representation of the present invention;
Fig. 3 is the device for recovering tail gas part-structure schematic diagram of the present invention;
Fig. 4 is the device for recovering tail gas internal structure schematic diagram of the present invention.
In figure:
1, frame; 2, catalyst furnace; 3, water tank; 11, weigh frame; 12, Weighing module; 21, offgas duct; 22, circulating gas pipe; 31, water power pump; 32, for water valve; 33, wash water valve; 34, vacuum pump; 35, vacuum breaker; 36; 37, overflow threeway; 38, waste pipe; 39, upflow tube.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the technical scheme of the present invention is described.
As Figure 1-4, a kind of efficient catalytic degreasing stove of safety and environmental protection, comprises frame 1 and catalyst furnace 2, unsettled in described frame 1 is provided with frame 11 of weighing, and frame 11 of weighing is connected with frame 1 by Weighing module 12, and catalyst furnace 2 is fixedly mounted on and weighs on frame 11; Described catalyst furnace 2 and its assembly are all fixedly mounted on frame 11 of weighing with it in one, weigh frame 11 by 4 Weighing modules 12 respectively with frame 11 assembly and connection, weight sensor on Weighing module 12 is connected with outside PLC control system, thus obtain and treat the real-time weight change data of degreasing part in catalyst furnace 2, learn in catalytic degreasing process according to presetting measuring and calculating further, binding agent contained on part consumes situation, reduction production cycle and auxiliary agent consumption, improve degreasing efficiency and quality, reduce production cost.
Described frame 1 is provided with device for recovering tail gas, and catalyst furnace 2 is provided with the offgas duct 21 being connected with device for recovering tail gas; Described device for recovering tail gas comprises water tank 3, water power pump 31 and relaying device, water tank 3 is connected with for water valve 32 and wash water valve 33, described relaying device is connected on the top board of water tank 3, and water power pump 31 output terminal and offgas duct 21 are connected with relaying device respectively, water power pump 31 input terminus is connected on water tank 3; Described relaying device comprises vacuum pump 34, and vacuum pump 34 is fixedly connected on the top board of water tank 3, and the two ends of vacuum pump 34 are connected with water power pump 31 output terminal and water tank 3 respectively; Being connected with vacuum breaker 35 on described vacuum pump 34, vacuum breaker 35 is connected with offgas duct 21.
Above-mentioned parts are agent structure of the present invention, add calcium hydroxide powder in above-mentioned water tank 3 and fully mix in saturated solution, the mixed tail gas containing formaldehyde, nitrogen, air, nitric acid or oxalic acid steam produced in catalyst furnace 2, vacuum pump 34 is driven to form circulation with water tank 3 by water power pump 31, the offgas duct 21 of catalyst furnace 2 is formed negative pressure of vacuum by vacuum pump 34, and mixed tail gas enters in water tank 3 via vacuum pump 34; Air in mixed tail gas be replaced gas, nitrogen as rare gas element through aqua calcis filter after directly enter in air; Described nitric acid and oxalic acid and aqua calcis can occur acid-base neutralisation to react at normal temperatures and pressures, and its chemical formula is as follows: nitric acid 2HNO3+Ca(OH)2=Ca (NO3)2+2H2O, oxalic acid H2C2O4+Ca(OH)2=CaC2O4↓ (white)+2H2O;The nitrogen peroxide that tackiness agent degreasing generates and aqua calcis reaction, its chemical formula is as follows: 3NO2+Ca(OH)2=Ca (NO3)2+ H2O+NO ↑, the nitrogen protoxide of generation continues and nitrogen peroxide, calcium hydroxide generation secondary reaction, and its chemical formula is as follows: Ca (OH) 2+NO+NO2=Ca (NO2) 2+H2O, and this reaction process also can realize at normal temperatures and pressures; Then there is Formose Reaction in the formaldehyde that tackiness agent degreasing generates, its chemical equation is as follows: nCH under the katalysis of calcium hydroxide2O→(CH2O), the primary product of Formose Reaction is simple glucose, is the best food of microorganism. Temperature is when 40 DEG C-80 DEG C, and Formose Reaction speed is the highest.
It is provided with snubber 36 in described water tank 3, the horn-like setting that snubber 36 is big up and small down, and the lower port of snubber 36 is located at below the working level of water tank 3, the upper port of snubber 36 is connected with vacuum pump 34, the tail gas mixing that described sodium hydroxide solution and catalyst furnace 2 produce enters water tank 3 by vacuum pump 34 injection, interval by entering in water tank 3 subsurface 400-500mm after the buffering of snubber 36, make tail gas mix with solution coincidence and react.
Being connected with overflow threeway 37 on one sidewall of described water tank 3, the level height of snubber 36 lower port, lower than overflow threeway 37, the other two-port of overflow threeway 37 is respectively equipped with waste pipe 38 and upflow tube 39; Air, nitrogen that described catalyst furnace 2 is discharged in working process enter waste gas Sewage treatment systems by overflow threeway 37, waste pipe 38 and carry out aftertreatment.
The top board of described water tank 3 is provided with circulating gas pipe 22, and circulating gas pipe 22 two ends are joining water box 3 and offgas duct 21 respectively; Described catalyst furnace 2 runs exists tolerance difference between the free air delivery of generation and vacuum pump 34 inspiratory capacity of water power pump 31 driving, and this tolerance difference connects water tank 3 by circulating gas pipe 22 and waste pipe 38 is balanced.
A kind of efficient catalytic degreasing furnaceman's skill of safety and environmental protection, processing step is as follows:
A, first calculate and treat that the binding agent polyoxymethylene gross weight contained by degreasing part is J in catalyst furnace 2, show that the nitric acid dosage needed for degreasing reaction is X, the usage quantity of calcium hydroxide powder is C, drops into calcium hydroxide powder with the ratio of molar concentration rate J+X:C=1:1 in water tank 3; Open again and to water filling in water tank 3, liquid level and adverse current mouth are maintained an equal level for water valve 32, the pipe path started between water power pump 31, vacuum pump 34, water tank 3 makes the water in water tank 3 and calcium hydroxide powder fully stir 10-15 minute, and the PH value obtaining saturated aqua calcis and this solution is between 11-14;
B, start catalytic degreasing stove and make rise in temperature to 110 DEG C～150 DEG C in its burner hearth, give in catalyst furnace 2 simultaneously and lead to nitrogen the air in burner hearth is discharged from offgas duct 21; Circulation path work between water power pump 31, vacuum pump 34, water tank 3 makes offgas duct 21 produce vacuum effect, thus the air discharged in catalyst furnace 2 and nitrogen mixture body enter water tank 3 from vacuum pump 34 and make aqua calcis be heated to 50 DEG C-60 DEG C, this part mixed gas is discharged by overflow threeway 37 and overflow threeway 37 connects waste gas Sewage treatment systems respectively by waste pipe 38 and upflow tube 39 and carries out aftertreatment; Described catalyst furnace 2 runs exists tolerance difference between the free air delivery of generation and vacuum pump 34 inspiratory capacity of water power pump 31 driving, and this tolerance difference connects water tank 3 by circulating gas pipe 22 and waste pipe 38 is balanced;
The burner hearth constant temperature of c, maintenance catalyst furnace 2, and add nitric acid or oxalic acid carries out degreasing reaction, the nitrogen, nitric acid or oxalic acid steam, the formaldehyde mix waste gas that produce in skimming processes enter in water tank 3 through vacuum pump 34 and react, the snubber 36 of vacuum pump 34 times ends exports in water tank 3 400-500mm below aqua calcis liquid level, thus makes mix waste gas and aqua calcis be able to abundant reaction;
D, said process being treated, the binding agent of the carrying out along with degreasing reaction of degreasing part on it constantly reduces, treat that the gross weight of degreasing part connects PLC control system monitoring by Weighing module 12, PLC control system regulates the transfer rate of nitric acid or oxalic acid, nitrogen flow, catalyst furnace 2 inner blower rotating speed according to weight-loss curve change, to improve degreasing reaction effect; Cut off the supply of nitric acid or oxalic acid when weight-loss curve stops change by PLC control system time delay after 60 minutes, wait 90-120 minute with nitrogen by emptying to the nitric acid in catalyst furnace 2 or oxalic acid steam, formaldehyde mix waste gas;
E, cooling of closing down catalyst furnace 2 and make its normal temperature, cutting off nitrogen conveying, device for recovering tail gas continues to run 60-120 minute, finally by wash water valve 33, the solution in water tank 3 is connected to waste gas Sewage treatment systems and carries out processing and discharge.
The above is only the better embodiment of the present invention, therefore all equivalences done according to the structure described in patent application scope of the present invention, feature and principle change or modify, and are included within the scope of patent application of the present invention.
Claims (7)
1. the efficient catalytic degreasing stove of safety and environmental protection, comprise frame (1) and catalyst furnace (2), it is characterized in that: unsettled in described frame (1) be provided with frame of weighing (11), frame (11) of weighing is connected with frame (1) by Weighing module (12), and catalyst furnace (2) is fixedly mounted on frame of weighing (11); Described frame (1) is provided with device for recovering tail gas, and catalyst furnace (2) is provided with the offgas duct (21) being connected with device for recovering tail gas.
2. the efficient catalytic degreasing stove of safety and environmental protection according to claim 1, it is characterized in that: described device for recovering tail gas comprises water tank (3), water power pump (31) and relaying device, water tank (3) is connected with for water valve (32) and wash water valve (33), described relaying device is connected on the top board of water tank (3), and water power pump (31) output terminal and offgas duct (21) are connected with relaying device respectively, water power pump (31) input terminus is connected on water tank (3).
3. the efficient catalytic degreasing stove of safety and environmental protection according to claim 2, it is characterized in that: described relaying device comprises vacuum pump (34), vacuum pump (34) is fixedly connected on the top board of water tank (3), and the two ends of vacuum pump (34) are connected with water power pump (31) output terminal and water tank (3) respectively; Being connected with vacuum breaker (35) on described vacuum pump (34), vacuum breaker (35) is connected with offgas duct (21).
4. the efficient catalytic degreasing stove of safety and environmental protection according to claim 3, it is characterized in that: in described water tank (3), be provided with snubber (36), the horn-like setting that snubber (36) is big up and small down, and the lower port of snubber (36) is located at below the working level of water tank (3), the upper port of snubber (36) is connected with vacuum pump (34).
5. the efficient catalytic degreasing stove of safety and environmental protection according to claim 4, it is characterized in that: a sidewall of described water tank (3) is connected with overflow threeway (37), the level height of snubber (36) lower port, lower than overflow threeway (37), the other two-port of overflow threeway (37) is respectively equipped with waste pipe (38) and upflow tube (39).
6. the efficient catalytic degreasing stove of safety and environmental protection according to claim 2, it is characterized in that: the top board of described water tank (3) is provided with circulating gas pipe (22), circulating gas pipe (22) two ends are joining water box (3) and offgas duct (21) respectively.
7. according to the arbitrary described efficient catalytic degreasing furnaceman's skill of a kind of safety and environmental protection of claim 1-6, it is characterised in that, processing step is as follows:
A, first calculate and treat that the binding agent contained by degreasing part (polyoxymethylene) gross weight is J in catalyst furnace (2), show that the nitric acid dosage needed for degreasing reaction is X, the usage quantity of calcium hydroxide powder is C, with molar concentration rate (J+X): the ratio of C=1:1 drops into calcium hydroxide powder in water tank (3);Open again and to water tank (3) interior water filling, liquid level and adverse current mouth are maintained an equal level for water valve (32), the pipe path started between water power pump (31), vacuum pump (34), water tank (3) makes the water in water tank (3) and calcium hydroxide powder fully stir 10-15 minute, and the PH value obtaining saturated aqua calcis and this solution is between 11-14;
B, start catalytic degreasing stove and make rise in temperature to 110 DEG C～150 DEG C in its burner hearth, give in catalyst furnace (2) simultaneously and lead to nitrogen the air in burner hearth is discharged from offgas duct (21); Circulation path work between water power pump (31), vacuum pump (34), water tank (3) makes offgas duct (21) produce vacuum effect, thus the air discharged in catalyst furnace (2) and nitrogen mixture body enter water tank (3) from vacuum pump (34) and make aqua calcis be heated to 50 DEG C-60 DEG C, this part mixed gas connects waste gas Sewage treatment systems by overflow threeway (37) discharge and overflow threeway (37) respectively by waste pipe (38) and upflow tube (39) and carries out aftertreatment; There is tolerance difference between the free air delivery that described catalyst furnace (2) operation produces and vacuum pump (34) inspiratory capacity that water power pump (31) drives, this tolerance difference connects water tank (3) by circulating gas pipe (22) and waste pipe (38) is balanced;
The burner hearth constant temperature of c, maintenance catalyst furnace (2), and add nitric acid or oxalic acid carries out degreasing reaction, the nitrogen, nitric acid or oxalic acid steam, the formaldehyde mix waste gas that produce in skimming processes enter in water tank (3) through vacuum pump (34) and react, snubber (36) outlet 400-500mm below aqua calcis liquid level in water tank (3) of vacuum pump (34) lower end, thus make mix waste gas and aqua calcis be able to abundant reaction;
D, said process being treated, the binding agent of the carrying out along with degreasing reaction of degreasing part on it constantly reduces, treat that the gross weight of degreasing part connects PLC control system monitoring by Weighing module (12), PLC control system regulates the transfer rate of nitric acid or oxalic acid, nitrogen flow, catalyst furnace (2) inner blower rotating speed according to weight-loss curve change, to improve degreasing reaction effect; Cut off the supply of nitric acid or oxalic acid when weight-loss curve stops change by PLC control system time delay after 60 minutes, wait 90-120 minute with nitrogen by emptying to the nitric acid in catalyst furnace (2) or oxalic acid steam, formaldehyde mix waste gas;
E, close down catalyst furnace (2) make its normal temperature cooling, cut off nitrogen conveying, device for recovering tail gas continues to run 60-120 minute, finally by wash water valve (33), the solution in water tank (3) is connected to waste gas Sewage treatment systems and carries out processing and discharge.
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| CN106270524A (en) * | 2016-10-21 | 2017-01-04 | 宁波斯百睿自控设备有限公司 | Catalysis degreasing system and catalysis degreasing method |
| CN107931604A (en) * | 2017-12-22 | 2018-04-20 | 宁波斯百睿自控设备有限公司 | A kind of gas-filtering device and catalysis degreasing stove |
| CN109320255A (en) * | 2018-11-09 | 2019-02-12 | 厦门钜瓷科技有限公司 | The preparation method of chip high heat-conducting ceramic radiator |
| CN109590464A (en) * | 2019-02-03 | 2019-04-09 | 宁波斯百睿自控设备有限公司 | A kind of Catalyzed by Oxalic Acid agent and the universal catalysis degreasing furnace of nitric acid catalyst |
| CN110722156A (en) * | 2019-11-22 | 2020-01-24 | 龙寒杰 | Oxalic acid and general catalytic degreasing stove of nitric acid |
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