CN211659610U

CN211659610U - Exhaust gas purification device on ventilation cabinet for air exhaust and supply

Info

Publication number: CN211659610U
Application number: CN201922342550.2U
Authority: CN
Inventors: 彭建昌
Original assignee: Beijing Hanchang Luyuan Environmental Protection Technology Co ltd
Current assignee: Beijing Hanchang Luyuan Environmental Protection Technology Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-10-13
Anticipated expiration: 2029-12-23

Abstract

The utility model belongs to the technical field of the exhaust purification technique and specifically relates to a waste gas purification device on fume chamber of airing exhaust is related to, a harmful gas for producing the fume chamber carries out purification treatment, the cavity has been seted up to one side of fume chamber, the fume chamber is last to be provided with the exhaust pipe with the inside intercommunication of cavity, purifier and exhaust pipe keep away from the one end intercommunication of fume chamber, the fume chamber is last to be provided with the air supply subassembly that is used for to the inside air supply of fume chamber, the air supply subassembly includes the blast pipe, the one end and the outdoor intercommunication of blast pipe, the other end extends to the direction that is close to the fume chamber, the fume chamber is seted up the side top of cavity and is provided with the supply-air cover, the one end that the blast pipe is close to the fume chamber is at the upper surface of supply-air cover and the inside intercommunication of supply-air cover, it purifies to the inside acidic, The effect of enabling the experimenter to work normally.

Description

Exhaust gas purification device on ventilation cabinet for air exhaust and supply

Technical Field

The utility model belongs to the technical field of the exhaust-gas purification technique and specifically relates to a waste gas purification device on ventilation cabinet airs exhaust.

Background

When trace elements are analyzed at present, a mixture of hydrochloric acid, nitric acid, hydrofluoric acid and perchloric acid is needed to be used for digesting a sample in a ventilation cabinet, namely, the mixture of four acidic solutions is needed to be heated to boiling and evaporated to dryness, a large amount of acidic waste gas containing perchloric acid smoke can be generated in the process, and if the acidic waste gas containing perchloric acid smoke cannot be timely treated, serious harm can be caused to the environment.

The current acidic waste gas that contains perchloric acid cigarette produces when using the fume chamber to test in the laboratory mostly, people often carry the outside of laboratory with the acidic waste gas that contains perchloric acid cigarette that produces, then purify to perchloric acid cigarette, but if the outdoor temperature is lower, when using the fume chamber when indoor temperature is suitable, if people discharge the acidic waste gas that contains perchloric acid cigarette that the fume chamber produced outdoor, the inside atmospheric pressure of fume chamber can reduce, the inside higher air of temperature in laboratory will be supplemented to fume chamber inside this moment, and can be carried outdoors along with the acidic waste gas that contains perchloric acid cigarette, will make the inside temperature in laboratory lower like this, cause the waste of resource, influence laboratory staff's normal work.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a waste gas purification device on ventilation cabinet airs exhaust has reached and has purified the inside acidic gas who contains perchloric acid cigarette that produces of ventilation cabinet, maintains the inside temperature in laboratory, reduces the wasting of resources, makes the effect that the experimenter can normally work.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a waste gas purification device on fume chamber of airing exhaust, a harmful gas for the fume chamber to the laboratory inside produces carries out purification treatment, the cavity has been seted up to one side of fume chamber, the fume chamber is last to be provided with the exhaust pipe with the inside intercommunication of cavity, purifier and exhaust pipe keep away from the one end intercommunication of fume chamber, the fume chamber is last to be provided with the air supply subassembly that is used for to the inside air supply of fume chamber, the air supply subassembly includes the blast pipe, the one end and the outdoor intercommunication of blast pipe, the other end extends to the direction that is close to the fume chamber, the side top that the cavity was seted up to the fume chamber is provided with the supply-air cover, the one end that the blast pipe is close to the fume chamber.

By adopting the technical scheme, when the purification device works, acid gas containing perchloric acid smoke generated by the ventilation cabinet enters the purification device through the exhaust pipe, and the purification device can purify harmful gas; meanwhile, in the process of treating harmful gases, the air pressure inside the ventilation cabinet can be reduced, the outside atmospheric pressure can push outdoor non-toxic air into the ventilation cabinet through the air supply pipe, so that the air pressure inside the ventilation cabinet can be maintained within a certain range, if the ventilation cabinet is used inside a laboratory in winter, the air supply assembly can reduce the heat dissipation inside the laboratory, and the effect of reducing energy waste is achieved.

The utility model discloses can further configure to in a preferred example, purifier includes the one-level filter of keeping away from the one end intercommunication of fume chamber with the exhaust pipe, one-level filter includes the casing with the exhaust pipe intercommunication, the inside shower that is provided with of casing, the one end intercommunication that the casing was kept away from to the shower has the water tank, be provided with the water pump between shower and the water tank, one side intercommunication that the exhaust pipe was kept away from to the casing has the secondary clarifier that is arranged in detaching the high chlorine sour cigarette of harmful gas, the low reaches of secondary clarifier is provided with the centrifugal fan with the inside intercommunication of secondary clarifier.

Through adopting above-mentioned technical scheme, at the inside in-process of carrying out the experiment of the fume chamber in laboratory, the inside alkaline solution that adds of water tank, for example: the method comprises the following steps of (1) starting a centrifugal fan and a water pump by using a NaOH solution, and allowing acidic harmful gas containing perchloric acid smoke generated in the ventilation cabinet to enter the shell through an exhaust pipe under the action of the centrifugal fan; the water pump can convey the alkaline solution in the water tank to the interior of the shell through the spray pipe, the acidic gas in the harmful gas except perchloric acid smoke can be removed by the alkaline solution sprayed to the interior of the water tank, the particle diameter of the perchloric acid smoke generated in the ventilation hood is larger at 0.3-1 micron, the surface tension is larger, and the perchloric acid smoke is insoluble in NaOH solution, so that the harmful gas cannot be removed after passing through the primary filter, but the particle diameter of the perchloric acid smoke is increased under the action of the spray liquid and becomes damp, and the situation that the dry perchloric acid smoke is attached to the side wall of the pipeline and is exploded when exposed to fire can be avoided; the main component is perchloric acid cigarette harmful gas can be adsorbed in the second clarifier is inside, has just so accomplished the process of detaching harmful ingredient among the harmful gas, and gas after the final purification can discharge the atmosphere through centrifugal fan, has reached and has purified the acid waste gas that contains perchloric acid cigarette, reduces environmental pollution's effect.

The utility model discloses can further configure to in a preferred example, the inside first silk screen that is provided with the polypropylene material of port that the fume chamber was kept away from to the blast pipe.

Through adopting above-mentioned technical scheme, inside first silk screen of blast pipe port can reduce inside entering into the blast pipe such as external large granule impurity or birds.

The present invention may be further configured in a preferred embodiment such that a heat exchanger is disposed between the air supply duct and the exhaust duct, the heat exchanger being located upstream of the housing.

Through adopting above-mentioned technical scheme, can accomplish the heat exchange with the inside gas of blast pipe in heat exchanger before the inside harmful gas of exhaust pipe gets into the casing, make the inside gas of blast pipe rise through the temperature behind the heat exchanger, like this when using the fume chamber in winter, the heat loss of fume chamber position department just can further reduce.

The present invention can be further configured in a preferred example, wherein the inside of the housing is provided with a plurality of layers of second silk screens made of polypropylene materials perpendicular to the flowing direction of the internal air flow.

Through adopting above-mentioned technical scheme, the alkaline solution that the shower sprayed can make the silk screen soaked, and the silk screen is perpendicular with the inside air current direction of casing, can make can inside harmful gas fully contact with alkaline solution, to harmful gas in addition perchloric acid cigarette absorptive more thoroughly.

The utility model discloses can further configure to in a preferred example, secondary clarifier includes the box, the both ends face of box respectively with casing and centrifugal fan intercommunication, the inside filter cloth that is provided with of box.

Through adopting above-mentioned technical scheme, inside gas through primary filter entered into the box, the inside filter cloth of box can filter the perchloric acid smoke particle that the diameter becomes big.

The utility model discloses can further configure to in a preferred example, be provided with the back flow between casing and the water tank, be provided with first control valve on the back flow.

By adopting the technical scheme, when the silk screen is required to be completely soaked, people can close the first control valve on the return pipe, so that the alkaline solution in the shell is continuously increased; after the wire mesh is completely wetted, the first control valve is opened to allow excess alkaline solution inside the housing to flow back to the inside of the tank.

The utility model discloses can further configure to in a preferred example, be provided with the blow off pipe on the water tank, be provided with the second control valve on the blow off pipe.

Through adopting above-mentioned technical scheme, harmful gas to the fume chamber production carries out the in-process that purifies, the water pump needs continuous to the inside alkaline solution of carrying of casing, inside alkaline solution of casing is inside the water tank that constantly flows back after reacting the inside acidic material except perchloric acid cigarette of harmful gas, alkaline solution can produce the salt material to the inside acidic material except perchloric acid cigarette reaction of harmful gas, along with carry out the time length that purifies to harmful gas, the salt material can become more gradually, equally, alkaline solution's basicity can reduce gradually, just need people to open the second control valve on the blow off pipe at this moment and discharge and handle the inside mixed solution of water tank.

The utility model discloses can further configure to in a preferred example, the shower is provided with the atomizer on being close to the end of casing.

Through adopting above-mentioned technical scheme, the atomizer on the shower can make the inside alkaline solution of shower spray with vaporific form spray inside the casing, can make the inside silk screen of casing soaked fast like this, reduces alkaline solution's waste.

To sum up, the utility model discloses following technological effect has:

1. the fume hood is provided with the air supply assembly and the purification device, the purification device on the fume hood can purify acidic waste gas containing perchloric acid smoke, and the air supply assembly can convey clean and nontoxic air outside the laboratory into the fume hood when the air pressure in the fume hood is reduced, so that the acidic gas containing perchloric acid smoke generated in the fume hood is purified, the temperature in the laboratory is maintained, the resource waste is reduced, and the effect of enabling experimental personnel to work normally is achieved;

2. through the arrangement of the first silk screen, external impurities can be reduced from entering the interior of the ventilation cabinet through the air supply pipe, and the effect of keeping the air in the laboratory fresh is achieved;

3. through having set up atomizer, the inside alkaline solution of shower nozzle can enter into the casing with vaporific form after atomizer, so not only can guarantee that the second silk screen is soaked, can reduce alkaline solution's use amount moreover, has reached the effect that reduces the wasting of resources.

Drawings

FIG. 1 is an overall structure of the present invention;

fig. 2 is an overall structural view of another aspect of the present invention.

In the figure, 1, a fume hood; 2. an exhaust duct; 3. a purification device; 31. a first stage filter; 311. a housing; 312. a second screen; 313. a shower pipe; 315. a water tank; 316. a water pump; 32. a secondary purifier; 321. a box body; 322. filtering cloth; 33. a centrifugal fan; 34. a return pipe; 35. a first control valve; 36. a blow-off pipe; 37. a second control valve; 4. an air supply assembly; 41. an air supply pipe; 42. an air supply cover; 43. a first screen; 44. a heat exchanger; 45. a primary filter.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the utility model provides a waste gas purification device on fume chamber of airing exhaust, fume chamber 1 sets up inside the laboratory, offers on fume chamber 1's a side and is used for carrying on experimental cavity, is provided with exhaust pipe 2 on the fume chamber 1, and the one end and the inside intercommunication of fume chamber 1 of exhaust pipe 2, the other end communicate inside purifier 3, still are provided with the air supply subassembly 4 to the inside air supply of fume chamber 1 on the fume chamber 1.

When 1 inside in the fume chamber of laboratory is tested, the acidic waste gas that contains perchloric acid cigarette that fume chamber 1 inside produced can enter into purifier 3 inside through exhaust pipe 2, purifier 3 can carry out purification treatment to harmful gas, simultaneously because the inside atmospheric pressure of fume chamber 1 reduces, air supply assembly 4 can be to 1 inside nontoxic air in the additional laboratory of the interior makeup of fume chamber, if in the time of using fume chamber 1 winter like this, can avoid the higher air of the inside temperature in laboratory to enter into fume chamber 1 inside, cause serious wasting of resources.

Referring to fig. 1, the purification apparatus 3 includes a primary filter 31, a secondary purifier 32 and a centrifugal fan 33 which are communicated with each other, and harmful gas generated inside the fume hood 1 passes through the primary filter 31 and the secondary purifier 32 in sequence after passing through the exhaust duct 2, and is discharged to the outside of the laboratory after passing through the centrifugal fan 33; the primary filter 31 can remove other acid gases except perchloric acid smoke in harmful gases, and can make perchloric acid smoke particles become large and moist, so that a large number of perchloric acid smoke particles are prevented from being attached to the inner wall of a pipeline and being exploded when exposed to fire; the secondary purifier 32 is capable of filtering the perchloric acid fumes of increasing diameter.

Referring to fig. 1, the primary filter includes a housing 311, a second mesh 312, a spray pipe 313, an atomizing nozzle, a water tank 315 and a water pump 316, the housing 311 is respectively communicated with the secondary purifier 32 and the exhaust pipe 2, the second mesh 312 is made of polypropylene, the second mesh 312 is vertically disposed inside the housing 311, a plane where the second mesh 312 is located is perpendicular to an air flow direction inside the housing 311, the second mesh 312 is disposed in plural, the water tank 315 is disposed inside the laboratory and located at one side of the fume hood 1, one end of the spray pipe 313 is communicated with the inside of the housing 311, the other end of the spray pipe 313 is communicated with the inside of the water tank 315, the water pump 316 is disposed on the spray pipe 313, and the atomizing nozzle is disposed at an end of the spray pipe 313 close to the housing 311.

The water pump 316 and the water tank 315 are placed in a laboratory, so that the situation that the outside temperature of the laboratory is too low in winter, and the normal use of the water pump 316 and the water tank 315 is influenced can be avoided; when harmful gas containing high-chlorine acid smoke generated by the fume hood 1 is treated, the water pump 316 is started, and an alkaline solution, such as: the sodium hydroxide solution and the water pump 316 can convey the alkaline solution inside the water tank 315 to the inside of the housing 311 through the spray pipe 313 and the atomizer, and can wet the second wire mesh 312 inside the housing 311, so that the harmful gas can be fully contacted with the alkaline solution on the second wire mesh 312 after entering the inside of the housing 311 through the exhaust pipe 2, and other acidic gases except perchloric acid smoke in the harmful gas can be removed.

Referring to fig. 1, a return pipe 34 is also communicated between the housing 311 and the water tank 315, and the return pipe 34 is provided with a first control valve 35. When the silk screen needs to be completely wetted, one can close the first control valve 35 on the return pipe 34, so that the alkaline solution inside the shell 311 is continuously increased; after the wire is completely wetted, the first control valve 35 is opened to return the excess alkaline solution inside the housing 311 to the inside of the water tank 315.

Referring to fig. 1, after the primary filter 31 is operated for a period of time, the alkalinity of the alkaline solution in the water tank 315 becomes weak, and in order to facilitate the discharge treatment of the solution in the water tank 315, a drain pipe 36 is disposed on the water tank 315, and a second control valve 37 is disposed on the drain pipe 36.

Referring to fig. 1, the secondary cleaner 32 includes a case 321 and filter cloths 322, both end surfaces of the case 321 communicate with the centrifugal fan 33 and the inside of the case 311, respectively, the filter cloths 322 are filter media woven from natural fibers or synthetic fibers, and the filter cloths 322 are disposed inside the case 321 and folded into six cylindrical shapes inside the case 321. Harmful gas after passing through the primary filter enters the box 321, and the filter cloth 322 is folded into a cylindrical shape, so that the diameter of filter holes in the filter cloth 322 can be reduced, the filter cloth 322 can be in full contact with harmful gas containing perchloric acid smoke, and the perchloric acid smoke in the harmful gas is purified more thoroughly in the shell 311.

Referring to fig. 2, the air supply unit 4 includes an air supply duct 41, an air supply cover 42, a first mesh 43, and a heat exchanger 44, the air supply cover 42 is disposed above the side surface of the ventilation hood 1 where the cavity is opened, one end of the air supply duct 41 communicates with the inside of the air supply cover 42 on the upper surface of the air supply cover 42, the other end extends to the outside of the laboratory, the first mesh 43 is disposed inside a port of the air supply duct 41 remote from the ventilation hood 1, the heat exchanger 44 is disposed between the air supply duct 41 and the exhaust duct 2, and the heat exchanger 44 is located upstream of the housing 311. In the process that the purification device 3 treats harmful gas generated in the fume hood 1, the air pressure in the fume hood 1 is reduced, and nontoxic air outside a laboratory is pushed into the fume hood 1 through the blast pipe 41 by the atmospheric pressure; the heat exchange between the harmful gas generated inside the fume hood 1 and the nontoxic air outside the laboratory is realized at the position of the heat exchanger 44, so that the heat loss inside the laboratory in winter can be further reduced.

Referring to fig. 2, the air supply duct 41 is provided with a primary filter 45 for further filtering the outside air, and the primary filter 45 is provided upstream of the heat exchanger 44.

To sum up, the utility model discloses a use does: when a test is performed in the fume hood 1 in the laboratory, the centrifugal fan 33 and the water pump 316 are started, the water pump 316 conveys the alkaline solution in the water tank 315 to the interior of the shell 311, and the centrifugal fan 33 can make harmful gas containing perchloric acid smoke generated in the fume hood 1 enter the shell 311 along the exhaust pipe 2; when the harmful gas passes through the shell 311, the alkaline solution in the shell 311 can remove acid gas except perchloric acid smoke in the harmful gas; harmful gas can enter the box body 321, and the cylindrical filter cloth 322 in the box body 321 can remove perchloric acid smoke particles in the harmful gas; finally, the air from which the perchloric acid smoke particles have been removed is discharged to the atmosphere via a centrifugal fan 33.

Purifier 3 carries out purification treatment's in-process to harmful gas, and the atmospheric pressure of fume chamber 1 inside can reduce, and outdoor atmospheric pressure can be with the nontoxic air propelling movement of external world to fume chamber 1 inside, just so can make the inside atmospheric pressure of fume chamber 1 maintain at certain pressure value within range.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a waste gas purification device on ventilation cabinet of airing exhaust for harmful gas to the inside fume chamber (1) production in laboratory carries out purification treatment, and the cavity has been seted up to one side of fume chamber (1), is provided with exhaust pipe (2) with the inside intercommunication of cavity on fume chamber (1), its characterized in that: purifier (3) and exhaust pipe (2) keep away from the one end intercommunication of fume chamber (1), be provided with air supply subassembly (4) that are used for to the inside air supply of fume chamber (1) on fume chamber (1), air supply subassembly (4) include blast pipe (41), the one end and the outdoor intercommunication of blast pipe (41), the other end extends to the direction that is close to fume chamber (1), the side top that the cavity was seted up in fume chamber (1) is provided with air supply cover (42), one end that blast pipe (41) are close to fume chamber (1) is at the upper surface of air supply cover (42) and the inside intercommunication of air supply cover (42).

2. The exhaust purification device of claim 1, further comprising: the purification device (3) comprises a first-stage filter (31) communicated with one end, far away from the fume hood (1), of the exhaust pipe (2), the first-stage filter (31) comprises a shell (311) communicated with the exhaust pipe (2), a spray pipe (313) is arranged inside the shell (311), one end, far away from the shell (311), of the spray pipe (313) is communicated with a water tank (315), a water pump (316) is arranged between the spray pipe (313) and the water tank (315), one side, far away from the exhaust pipe (2), of the shell (311) is communicated with a secondary purifier (32) used for removing high-chlorine acid smoke in harmful gas, and a centrifugal fan (33) communicated with the inside of the secondary purifier (32) is arranged at the downstream of the secondary purifier (32).

3. The exhaust purification device of claim 1, further comprising: a first silk screen (43) made of polypropylene is arranged in the port, far away from the ventilation cabinet (1), of the air supply pipe (41).

4. The exhaust purification device of claim 2, further comprising: a heat exchanger (44) is arranged between the air supply pipe (41) and the exhaust pipe (2), and the heat exchanger (44) is positioned at the upstream of the shell (311).

5. The exhaust purification device of claim 2, further comprising: the shell (311) is internally provided with a plurality of layers of second silk screens (312) made of polypropylene materials and vertical to the flowing direction of the internal airflow.

6. The exhaust purification device of claim 2, further comprising: the secondary purifier (32) comprises a box body (321), two end faces of the box body (321) are respectively communicated with the shell (311) and the centrifugal fan (33), and filter cloth (322) is arranged inside the box body (321).

7. The exhaust purification device of claim 6, wherein: a return pipe (34) is arranged between the shell (311) and the water tank (315), and a first control valve (35) is arranged on the return pipe (34).

8. The exhaust purification device of claim 7, further comprising: a sewage discharge pipe (36) is arranged on the water tank (315), and a second control valve (37) is arranged on the sewage discharge pipe (36).

9. The exhaust purification device of claim 2, further comprising: the end of the spray pipe (313) close to the shell (311) is provided with an atomizing nozzle.