CN114074969A - Dehydrogenation device, dehydrogenation method, and wastewater treatment system - Google Patents
Dehydrogenation device, dehydrogenation method, and wastewater treatment system Download PDFInfo
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- CN114074969A CN114074969A CN202010789115.9A CN202010789115A CN114074969A CN 114074969 A CN114074969 A CN 114074969A CN 202010789115 A CN202010789115 A CN 202010789115A CN 114074969 A CN114074969 A CN 114074969A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/18—Cleaning-out devices
Abstract
The invention relates to a dehydrogenation device, a dehydrogenation method and a wastewater treatment system, wherein the dehydrogenation device comprises a gas-liquid cyclone separator, a combustible gas detector and a blower, the gas-liquid cyclone separator comprises a gas-liquid separation pipe, the gas-liquid separation pipe is of a cylindrical structure arranged along the vertical direction, the top end and the bottom end of the gas-liquid separation pipe are respectively provided with an exhaust port and a liquid discharge port communicated with the inside of the gas-liquid separation pipe, the combustible gas detector is arranged at the exhaust port of the gas-liquid separation pipe, the upper side wall of the gas-liquid separation pipe is respectively provided with an air inlet and a liquid inlet communicated with the inside of the gas-liquid separation pipe, the liquid inlet of the gas-liquid separation pipe is arranged along the tangential direction of the inner wall of the gas-liquid separation pipe, the liquid inlet of the gas-liquid separation pipe is connected with an external liquid inlet pipeline, and the air inlet of the gas-liquid separation pipe is connected with the air outlet of the blower. The invention solves the technical problems of poor controllability and poor dilution effect on hydrogen of a hydrogen dilution method generated in the wastewater purification treatment process.
Description
Technical Field
The invention relates to the field of water treatment, and further relates to a dehydrogenation device, a dehydrogenation method and a wastewater treatment system, in particular to a dehydrogenation device, a dehydrogenation method and a wastewater treatment system for performing electrooxidation and electroflocculation treatment on wastewater by adopting an electrochemical method.
Background
The electro-oxidation and electro-flocculation technology is an electrochemical method for purifying waste water. The anode and the cathode in the electro-oxidation and electro-flocculation reactor generate oxidation-reduction reaction under the action of an external direct current electric field, a large amount of hydrogen microbubbles are generated in a certain time, and the microbubbles can be released in a short time, so that a large amount of pure hydrogen is gathered. If the hydrogen is ignited in the air, explosion can occur, and the explosion limit of the hydrogen is 4.0-75.6% (volume concentration), namely if the volume concentration of the hydrogen in the air is 4.0-75.6%, spark exists and the temperature is above 7000 ℃, the explosion can occur; if the concentration of hydrogen in the mixture is lower than the lower explosion limit, the concentration of combustible substances is not enough due to the large proportion of air, and the combustible substances cannot explode or combust even if exposed to open fire; if the concentration of hydrogen in the mixture is higher than the upper explosion limit, the mixture contains a large amount of combustible materials, even if the air is insufficient, the combustion supporting effect of oxygen is lacked, and the mixture meets open fire and can be combusted due to the contact with the air although the mixture cannot explode. Wherein: hydrogen and oxygen in a volume ratio of 2: 1 when reacting, the explosion is most violent. Since the volume fraction of oxygen in air is 21%, the ratio of the volume of air to the volume of hydrogen required for the exact reaction is about 5: 2, i.e. a concentration of 28.6% by volume of hydrogen in air, the explosion is most violent.
At the present stage, the effluent of the electrooxidation and electroflocculation reactor is diluted by the generated hydrogen by natural dissipation or blowing with large air volume of a fan before entering the next stage of treatment device, thereby preventing the hydrogen from exploding. However, the method for diluting hydrogen is poor in controllability, the dilution speed of hydrogen is slow, once the problems of small space, insufficient attention of workers and the like are encountered, diluted hydrogen is still in the hydrogen explosion limit range easily, if explosion occurs, normal operation is affected, and the personal safety of the workers is greatly threatened, so that the consequences are unreasonable.
Aiming at the problems of poor controllability and poor dilution effect on hydrogen generated in the wastewater purification treatment process in the prior art, no effective solution is provided at present.
Therefore, the inventor provides a dehydrogenation device, a dehydrogenation method and a wastewater treatment system by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a dehydrogenation device, a dehydrogenation method and a wastewater treatment system, which can perform dehydrogenation treatment on wastewater generated by an electrochemical treatment device to ensure that hydrogen in the wastewater is fully separated out, can quickly dilute the separated hydrogen to reduce the concentration of the hydrogen to be within a safe concentration range below 1%, and can be led out to an open area to be discharged, so that the purposes of quickly diluting the hydrogen and quickly treating the wastewater are achieved, in addition, the safety of the wastewater dehydrogenation treatment is improved, and the personal safety of workers is ensured.
The purpose of the invention can be realized by adopting the following technical scheme:
the invention provides a dehydrogenation device, which comprises a gas-liquid cyclone separator, a combustible gas detector and a blower, wherein:
the gas-liquid cyclone separator comprises a gas-liquid separation pipe, the gas-liquid separation pipe is of a cylindrical structure arranged along the vertical direction, an air exhaust port and a liquid discharge port communicated with the inside of the gas-liquid separation pipe are respectively formed in the top end and the bottom end of the gas-liquid separation pipe, the combustible gas detector is arranged at the air exhaust port of the gas-liquid separation pipe, an air inlet and a liquid inlet communicated with the inside of the gas-liquid separation pipe are respectively formed in the side wall of the upper portion of the gas-liquid separation pipe, the liquid inlet of the gas-liquid separation pipe is formed in the tangential direction of the inner wall of the gas-liquid separation pipe, the liquid inlet of the gas-liquid separation pipe is connected with an external liquid supply pipeline, and the air inlet of the gas-liquid separation pipe is connected with an air outlet of the air blower.
In a preferred embodiment of the present invention, the gas-liquid separation tube includes an upper tube body and a lower tube body, the upper tube body is a straight tube-shaped structure arranged along a vertical direction, the lower tube body is an inverted cone-shaped tube-shaped structure arranged along the vertical direction, a bottom end of the upper tube body is connected to a top end of the lower tube body, and an interior of the upper tube body is communicated with an interior of the lower tube body;
the exhaust port of the gas-liquid separation pipe is positioned at the top end of the upper section pipe body, the liquid discharge port of the gas-liquid separation pipe is positioned at the bottom end of the lower section pipe body, and the gas inlet and the liquid inlet of the gas-liquid separation pipe are both positioned on the upper side wall of the upper section pipe body.
In a preferred embodiment of the present invention, the upper tube and the lower tube are integrally formed.
In a preferred embodiment of the present invention, a liquid inlet pipe is connected to a liquid inlet of the gas-liquid separation pipe, and the gas-liquid separation pipe is connected to the external liquid inlet pipe through the liquid inlet pipe.
In a preferred embodiment of the present invention, an axial direction of the liquid inlet pipe is parallel to a tangential direction of an inner wall of the gas-liquid separation pipe, so that the liquid in the liquid inlet pipe flows into the gas-liquid separation pipe along the tangential direction of the inner wall of the gas-liquid separation pipe.
In a preferred embodiment of the present invention, the air inlet of the gas-liquid separation tube is located above the liquid inlet of the gas-liquid separation tube, the air inlet of the gas-liquid separation tube and the liquid inlet of the gas-liquid separation tube are arranged in the same direction, the air inlet of the gas-liquid separation tube is arranged along the tangential direction of the inner wall of the gas-liquid separation tube, the air inlet of the gas-liquid separation tube is connected with an air inlet tube, the air inlet tube is parallel to the liquid inlet tube, and the gas-liquid separation tube is connected with the air outlet of the blower through the air inlet tube.
In a preferred embodiment of the present invention, the gas-liquid cyclone separator further includes a flow guide pipe and an air outlet pipe, the flow guide pipe is disposed at the air outlet of the gas-liquid separation pipe along the vertical direction, the bottom end of the flow guide pipe passes through the air outlet of the gas-liquid separation pipe and extends into the gas-liquid separation pipe, the top end of the flow guide pipe is connected to the air outlet pipe, and the detection end of the combustible gas detector extends into the air outlet pipe.
In a preferred embodiment of the present invention, the dehydrogenation apparatus further includes a control cabinet, a controller and a frequency converter are disposed inside the control cabinet, a detection signal receiving end of the controller is electrically connected to a detection signal output end of the combustible gas detector, a control signal output end of the controller is electrically connected to a control signal receiving end of the frequency converter, and a control signal output end of the frequency converter is electrically connected to the control end of the blower.
In a preferred embodiment of the present invention, a touch screen is disposed on the control cabinet, and a control signal output end of the touch screen is electrically connected to a control signal receiving end of the controller.
The invention provides a dehydrogenation method, which comprises the following steps:
step S1: introducing the hydrogen-containing wastewater generated after electrochemical treatment into the gas-liquid separation pipe at a high speed along the tangential direction of the inner wall of the gas-liquid separation pipe through a liquid inlet of the gas-liquid separation pipe so as to form a fluid rotating at a high speed along the inner wall of the gas-liquid separation pipe;
step S2: separating the wastewater from hydrogen gas present in the wastewater in the form of micro-bubbles;
step S3: starting a blower to introduce air into the gas-liquid separation pipe through an air inlet of the gas-liquid separation pipe, wherein the air is mixed with the hydrogen so as to dilute the concentration of the hydrogen in the gas-liquid separation pipe to be below the explosion limit of the hydrogen;
step S4: discharging the mixed gas of the air and the hydrogen through an exhaust port of the gas-liquid separation pipe, and detecting the concentration of the hydrogen in the discharged mixed gas in real time through a combustible gas detector;
step S5: and discharging the wastewater separated from the hydrogen gas into a next-stage wastewater treatment device through a liquid outlet of the gas-liquid separation pipe.
In a preferred embodiment of the present invention, in the step S2, the pressure inside the gas-liquid separation pipe is reduced.
In a preferred embodiment of the present invention, in the step S3, the direction of introducing the air into the gas-liquid separation pipe is the same as the direction of introducing the wastewater into the gas-liquid separation pipe.
The invention provides a wastewater treatment system which comprises a wastewater purification device, a power supply and the dehydrogenation device, wherein an electrode for electrifying wastewater in the wastewater purification device to oxidize or flocculate the wastewater is arranged on the wastewater purification device, the power supply end of the power supply is connected with the electrode on the wastewater purification device, and the liquid outlet of the wastewater purification device is connected with the liquid inlet of the dehydrogenation device.
In a preferred embodiment of the present invention, the wastewater treatment system further includes a lift pump, the lift pump is disposed at the liquid inlet of the wastewater purification apparatus, and a control end of the lift pump is electrically connected to the control signal output end of the controller.
In a preferred embodiment of the present invention, the wastewater purification apparatus is an electrocatalytic oxidation reactor or an electrocoagulation reactor.
In a preferred embodiment of the present invention, the power source is a dc pulse power source, and the control terminal of the power source is electrically connected to the control signal output terminal of the controller.
From the above, the dehydrogenation apparatus, the dehydrogenation method and the wastewater treatment system of the present invention have the following characteristics and advantages: the inlet of gas-liquid separation pipe and the outside liquid pipe connection that comes, and the tangential direction of the inner wall of gas-liquid separation pipe is seted up along gas-liquid separation pipe's inlet to the produced waste water of electrochemical treatment device loops through the inlet that comes liquid pipeline and gas-liquid separation pipe and lets in to gas-liquid separation pipe's inside, the waste water that thoughtlessly has hydrogen flows along gas-liquid separation pipe's inner wall rotation, thereby hydrogen in usable cyclone's principle with the waste water fully appears, because gas-inlet department of gas-liquid separation pipe is connected with the air-blower, can let in the air to gas-liquid separation pipe's inside when hydrogen appears, make the air in gas-liquid separation pipe's inside and waste water syntropy rotatory, and then air and the hydrogen flash mixed who appears, dilute the concentration of hydrogen, staff's personal safety and operation safety have been guaranteed. In addition, a combustible gas detector is arranged at the exhaust port of the gas-liquid separation pipe, and can detect the concentration of hydrogen in the externally discharged mixed gas in real time, so that the air introduction amount of the air blower is controlled, the concentration of the hydrogen is ensured to be diluted to a safe concentration range, the controllability is strong, the requirement on the safety treatment of the hydrogen in the electrochemical treatment is met, and the gas-liquid separation device is suitable for popularization and use.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is a schematic structural diagram of the dehydrogenation device.
FIG. 2: is a structural schematic diagram of a gas-liquid cyclone separator in the dehydrogenation device.
FIG. 3: is a transverse cross-sectional view taken at the location a-a in fig. 2.
FIG. 4: is a schematic structural diagram of the wastewater treatment system.
FIG. 5: is an electrical connection block diagram of the wastewater treatment system of the invention.
The reference numbers in the invention are:
1. a gas-liquid cyclone separator; 101. A gas-liquid separation pipe;
1011. an upper section pipe body; 1012. A lower tube body;
102. an air inlet pipe; 103. A liquid inlet pipe;
104. a flow guide pipe; 105. An air outlet pipe;
106. a liquid discharge port; 2. A blower;
3. a combustible gas detector; 4. A control cabinet;
5. a wastewater purification device; 6. A lift pump;
7. a power source; 8. A controller;
9. a frequency converter; 10. A touch screen.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Implementation mode one
As shown in fig. 1 to 5, the present invention provides a dehydrogenation apparatus including a gas-liquid cyclone 1, a combustible gas detector 3, and a blower 2, wherein: the gas-liquid cyclone separator 1 includes a gas-liquid separation pipe 101, the gas-liquid separation pipe 101 is a cylindrical structure arranged along a vertical direction, an exhaust port communicated with the inside of the gas-liquid separation pipe 101 is formed at the top end of the gas-liquid separation pipe 101, a liquid discharge port 106 communicated with the inside of the gas-liquid separation pipe 101 is formed at the bottom end of the gas-liquid separation pipe 101, the combustible gas detector 3 is arranged at the exhaust port of the gas-liquid separation pipe 101, an air inlet and a liquid inlet communicated with the inside of the gas-liquid separation pipe 101 are respectively formed in the upper side wall of the gas-liquid separation pipe 101, the liquid inlet of the gas-liquid separation pipe 101 is formed along the tangential direction of the inner wall of the gas-liquid separation pipe 101, the liquid inlet of the gas-liquid separation pipe 101 is connected with an external liquid supply pipeline through a water pipeline, and the air inlet of the gas-liquid separation pipe 101 is connected with an air outlet of the air blower 2 through an air pipeline.
According to the invention, the liquid inlet of the gas-liquid separation pipe 101 is connected with an external liquid inlet pipeline, the liquid inlet of the gas-liquid separation pipe 101 is arranged along the tangential direction of the inner wall of the gas-liquid separation pipe 101, wastewater generated by an electrochemical treatment device is introduced into the gas-liquid separation pipe 101 through the liquid inlet of the gas-liquid separation pipe 101 in sequence, and the wastewater mixed with hydrogen flows along the inner wall of the gas-liquid separation pipe 101 in a rotating manner, so that hydrogen in the wastewater can be fully separated out by utilizing the principle of cyclone separation, and because the air inlet of the gas-liquid separation pipe 101 is connected with the air blower 2, air can be introduced into the gas-liquid separation pipe 101 while the hydrogen is separated out, so that the air and the wastewater rotate in the same direction in the gas-liquid separation pipe 101, and then the air and the separated hydrogen are rapidly mixed, the concentration of the hydrogen is diluted, and the personal safety and the operation safety of workers are ensured. In addition, the combustible gas detector 3 is arranged at the exhaust port of the gas-liquid separation pipe 101, and can detect the concentration of hydrogen in the discharged mixed gas in real time, so that the air inlet amount of the blower 2 is controlled, the concentration of the hydrogen is ensured to be diluted to be within a safe concentration range below 1%, the controllability is strong, the requirement of the electrochemical treatment on the hydrogen safety treatment is met, and the device is suitable for popularization and use.
In an alternative embodiment of the present invention, as shown in fig. 1 and fig. 2, the gas-liquid separation pipe 101 includes an upper pipe 1011 and a lower pipe 1012, the upper pipe 1011 is a straight cylindrical structure arranged along a vertical direction, the lower pipe 1012 is an inverted conical cylindrical structure arranged along the vertical direction, a bottom end of the upper pipe 1011 is connected to a top end of the lower pipe 1012, and an inside of the upper pipe 1011 is communicated with an inside of the lower pipe 1012; the gas outlet of the gas-liquid separation pipe 101 is located at the top end of the upper pipe 1011, the liquid outlet 106 of the gas-liquid separation pipe 101 is located at the bottom end of the lower pipe 1012, and the gas inlet and the liquid inlet of the gas-liquid separation pipe 101 are both located on the upper side wall of the upper pipe 1011. The setting of upper segment body 1011 guarantees that waste water can carry out the rotational flow along the inner wall after letting in gas-liquid separation pipe 101, guarantees that hydrogen in the waste water can be to the separation with waste water under the effect of centrifugal force, and waste water after separating with hydrogen is because self gravity down flows to lower segment body 1012 to drainage to leakage fluid dram 106 department is outwards discharged through lower segment body 1012, reaches the thorough separation of gas, liquid.
Further, the upper tube 1011 and the lower tube 1012 may be, but not limited to, integrally formed.
In an alternative embodiment of the present invention, as shown in fig. 1 to 3, a liquid inlet pipe 103 is connected to a liquid inlet of the gas-liquid separation pipe 101, and the gas-liquid separation pipe 101 is connected to an external liquid inlet pipeline through the liquid inlet pipe 103. The axial direction of the liquid inlet pipe 103 is parallel to the tangential direction of the inner wall of the gas-liquid separation pipe 101, so that the liquid in the liquid inlet pipe 103 flows into the inside of the gas-liquid separation pipe 101 along the tangential direction of the inner wall of the gas-liquid separation pipe 101.
Further, as shown in fig. 1 and 2, the air inlet of the gas-liquid separation tube 101 is located above the liquid inlet of the gas-liquid separation tube 101, the air inlet of the gas-liquid separation tube 101 and the liquid inlet of the gas-liquid separation tube 101 are arranged in the same direction, the air inlet of the gas-liquid separation tube 101 is arranged along the tangential direction of the inner wall of the gas-liquid separation tube 101, the air inlet of the gas-liquid separation tube 101 is connected with an air inlet pipe 102, the air inlet pipe 102 is parallel to the liquid inlet tube 103, and the gas-liquid separation tube 101 is connected with the air outlet of the blower 2 through the air inlet pipe 102, so that the flow direction of the air introduced by the blower 2 in the gas-liquid separation tube 101 is the same as the flow direction of the wastewater in the gas-liquid separation tube 101, so that the air and the wastewater can flow together in a rotating manner, and the air and the hydrogen are mixed in the rotating flow process, so as to achieve the effect of rapidly diluting the hydrogen.
In an alternative embodiment of the present invention, as shown in fig. 1 and fig. 2, the gas-liquid cyclone 1 further includes a guide pipe 104 and an outlet pipe 105, the guide pipe 104 is disposed at the exhaust port of the gas-liquid separation pipe 101 along the vertical direction, the bottom end of the guide pipe 104 passes through the exhaust port of the gas-liquid separation pipe 101 and extends into the gas-liquid separation pipe 101, the top end of the guide pipe 104 is connected to one end of the outlet pipe 105, and the detection end of the combustible gas detector 3 extends into the outlet pipe 105. Play the effect of drainage through honeycomb duct 104, the trachea line can be connected to the other end of outlet duct 105, discharges the mist to spacious region through the trachea line, avoids causing the influence to all ring edge borders and staff's health, has reached the requirement of rapid dilution, safe operation.
In an optional embodiment of the present invention, as shown in fig. 1 and 5, the dehydrogenation apparatus further includes a control cabinet 4, a controller 8 and a frequency converter 9 are disposed inside the control cabinet 4, a detection signal receiving end of the controller 8 is electrically connected to a detection signal output end of the combustible gas detector 3, a control signal output end of the controller 8 is electrically connected to a control signal receiving end of the frequency converter 9, and a control signal output end of the frequency converter 9 is electrically connected to a control end of the blower 2. The frequency converter 9 can be controlled in real time through the controller 8, so that the running speed of the blower 2 is controlled, the air inlet amount and the air pressure of the blower 2 introduced into the gas-liquid separation pipe 101 are adjusted, and the concentration of combustible gas (namely, hydrogen) in the discharged mixed gas is ensured to be lower than a set value of 1%. When the air blower 2 is controlled to be in low-speed operation, the noise can be reduced, and the influence on the normal work of other workers is avoided.
Further, the blower 2 is a high-pressure blower to ensure that a sufficient amount of air can be introduced into the gas-liquid separation pipe 101.
Further, as shown in fig. 5, a touch screen 10 is disposed on the control cabinet 4, a control signal output end of the touch screen 10 is electrically connected to a control signal receiving end of the controller 8, and a worker can control the touch screen 10 to send a control signal to the outside.
In an optional embodiment of the present invention, an air pump is disposed on an inner wall of the flow guiding pipe 104, a control end of the air pump is electrically connected to a control signal output end of the controller 8, before the hydrogen gas is separated from the wastewater, the controller 8 controls the air pump to start, and the air pump discharges the original air in the gas-liquid separating pipe 101, so as to reduce the internal pressure of the gas-liquid separating pipe 101. After the hydrogen is separated out from the wastewater, the air pump can be closed, and the condition that the separated hydrogen is directly pumped out to the outside by the air pump is avoided.
The dehydrogenation device has the characteristics and advantages that:
firstly, the dehydrogenation device adopts a gas-liquid cyclone separator 1, and separates out free and micro-bubble hydrogen suspended in water by utilizing the property difference of different densities of gas and liquid. The concentration of the separated hydrogen is quickly diluted to be within the safe concentration range below 1% by utilizing the compressed air of the blower 2, and the mixed gas is led to an open area to be discharged, so that the purposes of quick dilution and safe operation are achieved.
Secondly, the dehydrogenation device is provided with a combustible gas detector 3 at the exhaust port, detects the content of combustible gas in the discharged mixed gas in real time, and adjusts the running speed of the blower 2 in real time through a frequency converter 9, so that the air quantity introduced into the blower reaches a set value that the content of combustible gas in the discharged mixed gas is lower than 1%, and the discharge safety is ensured.
And thirdly, the dehydrogenation device adopts lower treatment pressure, so that the release degree of the dissolved gas in the solution is improved, the treatment energy consumption is reduced, and the thorough gas-liquid separation is realized.
Fourthly, the dehydrogenation device has compact structure, small volume, light weight, stable and reliable work and simple operation and maintenance, can efficiently separate hydrogen and is suitable for popularization and use.
Second embodiment
The invention provides a dehydrogenation method, which comprises the following steps:
step S1: introducing the waste water containing gas such as hydrogen generated after electrochemical treatment (namely the waste water discharged after the waste water is reacted in an electrocatalytic oxidation reactor or an electrocoagulation reactor) into the gas-liquid separation pipe 101 at a high speed along the tangential direction of the inner wall of the gas-liquid separation pipe 101 through the liquid inlet of the gas-liquid separation pipe 101 so as to enable the waste water to form fluid rotating at a high speed along the inner wall of the gas-liquid separation pipe 101;
step S2: the centrifugal force generated by the wastewater in the high-speed rotation process is far greater than the gravity of the wastewater, and due to the difference of the densities of the gas and the liquid, in the process that the liquid and the gas are mixed and flow in a rotating manner, the centrifugal force borne by the liquid is greater than the centrifugal force borne by the gas, so that the hydrogen suspended in the wastewater in the form of micro bubbles can be separated from the wastewater at an accelerated speed under the action of different centrifugal forces, the hydrogen is separated from the wastewater, and other gases mixed in the wastewater can be synchronously separated;
step S3: starting the blower 2, introducing compressed air into the gas-liquid separation pipe 101 through the gas inlet of the gas-liquid separation pipe 101 by the blower 2, mixing the introduced air with hydrogen, and quickly diluting the hydrogen concentration in the gas-liquid separation pipe 101 to a safe concentration range below 1%;
step S4: the mixed gas of air and hydrogen is discharged to the outside to an open area through the exhaust port of the gas-liquid separation pipe 101, the concentration of hydrogen in the discharged mixed gas is detected in real time by the combustible gas detector 3 in the outside discharging process, so that the running speed of the blower 2 can be adjusted, and the amount of air introduced into the blower is adjusted to achieve the set value that the content of combustible gas (namely, hydrogen) in the discharged mixed gas is lower than 1%;
step S5: the wastewater separated from the hydrogen gas is discharged into the next-stage wastewater treatment apparatus through the liquid outlet 106 of the gas-liquid separation pipe 101, thereby completing the dehydrogenation process.
In an optional embodiment of the present invention, in step S2, the suction pump is controlled to start, and the suction pump discharges the original air in the gas-liquid separation pipe 101 to reduce the pressure inside the gas-liquid separation pipe 101, because the solubility of the gas in the solution is proportional to the pressure, when the internal pressure of the gas-liquid separation pipe 101 is reduced, the solubility of the hydrogen in the wastewater is reduced, and along with the coalescence of the bubbles, the separation speed of the hydrogen is further increased, so as to improve the precipitation efficiency of the hydrogen. After the hydrogen is separated out from the wastewater, the air pump can be closed, and the condition that the separated hydrogen is directly pumped out to the outside by the air pump is avoided.
In an alternative embodiment of the present invention, in the step S3, the direction of introducing the air into the gas-liquid separation pipe 101 is the same as the direction of introducing the wastewater into the gas-liquid separation pipe 101, so that the air and the wastewater can flow together in a rotating manner, and the air and the hydrogen are mixed during the rotating flow, so as to achieve the effect of rapidly diluting the hydrogen.
Third embodiment
As shown in fig. 4 and 5, the present invention provides a wastewater treatment system, which comprises a wastewater purification device 5, a power supply 7 and the above dehydrogenation device, wherein the wastewater purification device 5 is provided with an electrode for electrifying the wastewater therein to oxidize or flocculate the wastewater, the power supply end of the power supply 7 is connected with the electrode on the wastewater purification device 5, and the liquid outlet of the wastewater purification device 5 is connected with the liquid inlet of the dehydrogenation device.
In an optional embodiment of the present invention, as shown in fig. 4 and 5, the wastewater treatment system further includes a lift pump 6, the lift pump 6 is disposed at the inlet of the wastewater purification device 5, a control end of the lift pump 6 is electrically connected to a control signal output end of the controller 8, the controller 8 controls a working state of the lift pump 6, and the lift pump 6 lifts the wastewater into the wastewater purification device 5, so as to ensure smooth oxidation or flocculation reaction.
Further, the wastewater purification apparatus 5 may be, but is not limited to, an electrocatalytic oxidation reactor or an electrocoagulation reactor.
In an alternative embodiment of the present invention, as shown in fig. 4 and 5, the power supply 7 is a dc pulse power supply, the control terminal of the power supply 7 is electrically connected to the control signal output terminal of the controller 8, and the controller 8 controls the power supply 7 to charge the wastewater purification apparatus 5.
The wastewater treatment system has the characteristics and advantages that:
this effluent disposal system not only can carry out dehydrogenation to the produced waste water of electrochemical treatment device, guarantee that the hydrogen in the waste water fully appears, and can dilute the hydrogen that appears fast, reduce the concentration of hydrogen to the safe concentration within range below 1%, and draw forth and discharge to open region, realized diluting hydrogen fast, the purpose of carrying out the rapid processing to waste water, the waste water dehydrogenation security of handling has been improved, staff's personal safety has been guaranteed, this dehydrogenation method is simple and practical, and convenient for operation is suitable for being generalized to use.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.
Claims (16)
1. A dehydrogenation device characterized by comprising a gas-liquid cyclone (1), a combustible gas detector (3) and a blower (2), wherein:
the gas-liquid cyclone separator (1) comprises a gas-liquid separation pipe (101), the gas-liquid separation pipe (101) is of a cylindrical structure arranged along the vertical direction, the top end and the bottom end of the gas-liquid separation pipe (101) are respectively provided with an exhaust port and a liquid outlet (106) which are communicated with the inside of the gas-liquid separation pipe (101), the combustible gas detector (3) is arranged at the air outlet of the gas-liquid separation pipe (101), the side wall of the upper part of the gas-liquid separation pipe (101) is respectively provided with a gas inlet and a liquid inlet which are communicated with the inside of the gas-liquid separation pipe (101), the liquid inlet of the gas-liquid separation pipe (101) is arranged along the tangential direction of the inner wall of the gas-liquid separation pipe (101), the liquid inlet of the gas-liquid separation pipe (101) is connected with an external liquid inlet pipeline, and the gas inlet of the gas-liquid separation pipe (101) is connected with the air outlet of the air blower (2).
2. The dehydrogenation apparatus according to claim 1, wherein the gas-liquid separation pipe (101) comprises an upper pipe body (1011) and a lower pipe body (1012), the upper pipe body (1011) has a straight cylindrical structure arranged in a vertical direction, the lower pipe body (1012) has an inverted conical cylindrical structure arranged in the vertical direction, a bottom end of the upper pipe body 1011 is connected to a top end of the lower pipe body (1012), and an interior of the upper pipe body (1011) is communicated with an interior of the lower pipe body (1012);
the exhaust port of the gas-liquid separation pipe (101) is located at the top end of the upper section pipe body (1011), the liquid outlet (106) of the gas-liquid separation pipe (101) is located at the bottom end of the lower section pipe body (1012), and the gas inlet and the liquid inlet of the gas-liquid separation pipe (101) are both located on the upper side wall of the upper section pipe body (1011).
3. The dehydrogenation apparatus of claim 2, wherein the upper section (1011) is integrally formed with the lower section (1012).
4. The dehydrogenation apparatus according to claim 1, wherein a liquid inlet pipe (103) is connected to the liquid inlet of the gas-liquid separation pipe (101), and the gas-liquid separation pipe (101) is connected to the external liquid inlet pipeline through the liquid inlet pipe (103).
5. The dehydrogenation apparatus according to claim 4, wherein the axial direction of the liquid inlet pipe (103) is parallel to the tangential direction of the inner wall of the gas-liquid separation pipe (101) so that the liquid in the liquid inlet pipe (103) flows into the inside of the gas-liquid separation pipe (101) in the tangential direction of the inner wall of the gas-liquid separation pipe (101).
6. The dehydrogenation device according to claim 5, wherein the gas inlet of the gas-liquid separation pipe (101) is located above the liquid inlet of the gas-liquid separation pipe (101), the gas inlet of the gas-liquid separation pipe (101) and the liquid inlet of the gas-liquid separation pipe (101) are opened in the same direction, the gas inlet of the gas-liquid separation pipe (101) is opened along the tangential direction of the inner wall of the gas-liquid separation pipe (101), the gas inlet of the gas-liquid separation pipe (101) is connected with a gas inlet pipe (102), the gas inlet pipe (102) is parallel to the liquid inlet pipe (103), and the gas-liquid separation pipe (101) is connected with the air outlet of the blower (2) through the gas inlet pipe (102).
7. The dehydrogenation apparatus according to claim 1, wherein the gas-liquid cyclone (1) further comprises a flow guide pipe (104) and an outlet pipe (105), the flow guide pipe (104) is disposed at the outlet of the gas-liquid separation pipe (101) along a vertical direction, the bottom end of the flow guide pipe (104) passes through the outlet of the gas-liquid separation pipe (101) and extends into the gas-liquid separation pipe (101), the top end of the flow guide pipe (104) is connected to the outlet pipe (105), and the detection end of the combustible gas detector (3) extends into the outlet pipe (105).
8. The dehydrogenation device according to claim 1, further comprising a control cabinet (4), wherein a controller (8) and a frequency converter (9) are arranged inside the control cabinet (4), a detection signal receiving end of the controller (8) is electrically connected with a detection signal output end of the combustible gas detector (3), a control signal output end of the controller (8) is electrically connected with a control signal receiving end of the frequency converter (9), and a control signal output end of the frequency converter (9) is electrically connected with a control end of the blower (2).
9. The dehydrogenation device according to claim 8, wherein a touch screen (10) is disposed on the control cabinet (4), and a control signal output end of the touch screen (10) is electrically connected to a control signal receiving end of the controller 8.
10. A dehydrogenation process, characterized in that it comprises the steps of:
step S1: introducing the hydrogen-containing wastewater generated after electrochemical treatment into the gas-liquid separation pipe (101) at a high speed along the tangential direction of the inner wall of the gas-liquid separation pipe (101) through a liquid inlet of the gas-liquid separation pipe (101) so as to form a high-speed rotating fluid along the inner wall of the gas-liquid separation pipe (101);
step S2: separating the wastewater from hydrogen gas present in the wastewater in the form of micro-bubbles;
step S3: starting a blower (2) to introduce air into the gas-liquid separation pipe (101) through an air inlet of the gas-liquid separation pipe (101), wherein the air is mixed with the hydrogen so as to dilute the hydrogen concentration in the gas-liquid separation pipe (101) to be below the explosion limit of the hydrogen;
step S4: the mixed gas of the air and the hydrogen is discharged through an exhaust port of the gas-liquid separation pipe (101), and the concentration of the hydrogen in the discharged mixed gas is detected in real time through a combustible gas detector (3);
step S5: and discharging the wastewater separated from the hydrogen gas into a next-stage wastewater treatment device through a liquid outlet (106) of the gas-liquid separation pipe (101).
11. The dehydrogenation method according to claim 10, wherein in step S2, the pressure in the gas-liquid separation pipe (101) is reduced.
12. The dehydrogenation method according to claim 10, wherein in step S3, the air is introduced into the gas-liquid separation pipe (101) in the same direction as the wastewater is introduced into the gas-liquid separation pipe (101).
13. A wastewater treatment system, which is characterized in that the wastewater treatment system comprises a wastewater purification device (5), a power supply (7) and the dehydrogenation device as defined in any one of claims 1 to 9, wherein the wastewater purification device (5) is provided with an electrode for electrifying the wastewater inside the wastewater to oxidize or flocculate the wastewater, the power supply end of the power supply (7) is connected with the electrode on the wastewater purification device (5), and the liquid outlet of the wastewater purification device (5) is connected with the liquid inlet of the dehydrogenation device.
14. The wastewater treatment system according to claim 13, further comprising a lift pump (6), wherein the lift pump (6) is disposed at an inlet of the wastewater purification device (5), and a control terminal of the lift pump (6) is electrically connected with a control signal output terminal of the controller (8).
15. The wastewater treatment system according to claim 13, wherein the wastewater purification device (5) is an electrocatalytic oxidation reactor or an electrocoagulation reactor.
16. The wastewater treatment system according to claim 13, characterized in that the power supply (7) is a direct current pulse power supply, and a control terminal of the power supply (7) is electrically connected with a control signal output terminal of the controller (8).
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