CN112408334B - Ozone production system for improving ozone yield and method for producing ozone by ozone production system - Google Patents
Ozone production system for improving ozone yield and method for producing ozone by ozone production system Download PDFInfo
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- CN112408334B CN112408334B CN202011385985.6A CN202011385985A CN112408334B CN 112408334 B CN112408334 B CN 112408334B CN 202011385985 A CN202011385985 A CN 202011385985A CN 112408334 B CN112408334 B CN 112408334B
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Abstract
The invention provides an ozone production system for improving the yield of ozone and a method for producing the ozone, wherein the ozone production system comprises an air pretreatment device, an oxygen supply device and an ozone generator; the air pretreatment device is sequentially provided with an air compressor, an oil-water separator, a cold dryer, a suction dryer, an air filter and a pressure reducing valve; the oxygen supply device comprises a liquid oxygen vaporizer, gasified oxygen is merged into a gas transmission pipeline after a pressure reducing valve, and the gasified oxygen is mixed with air and then enters an ozone generator; the ozone generator comprises a plurality of reaction chambers, wherein a high-voltage electrode plate, a low-voltage electrode plate and a cooling water pipe are arranged in each reaction chamber, and mixed gas of oxygen and air is introduced into each reaction chamber in a parallel connection mode. The raw materials of the invention are reasonably proportioned with air at a proper position after being vaporized by liquid oxygen and then enter the ozone generator.
Description
Technical Field
The invention belongs to the technical field of ozone preparation for water treatment, and particularly relates to an ozone production system for improving ozone yield and a method for producing ozone by using the ozone production system.
Background
Ozone has strong oxidizability, is stronger than oxygen, is one of the strongest oxidants in the nature, and can perform oxidation reaction at a lower temperature. Meanwhile, ozone has extremely strong bactericidal performance, and the oxidation-reduction potential of ozone is second to that of fluorine in water. Because the product after the ozone reaction is oxygen, the ozone is a high-efficiency green clean oxidant without secondary pollution, and is widely applied to the fields of water treatment, food processing, storage, fresh keeping, household appliances, medical sanitation, chemical oxidation and the like.
Ozone begins to decay at normal temperature, and decays by half in 1 minute at about 30 ℃ and reaches 80% at 40-50 ℃. Therefore, ozone is generally produced using an ozone generator and used. At present, ozone generators are classified into a high-voltage discharge type, an ultraviolet irradiation type, and an electrolytic type according to the mode of ozone generation. The raw materials used mainly comprise air, oxygen-enriched air and pure oxygen, the improvement of the oxygen concentration in the raw materials is beneficial to improving the yield of ozone, and the prior example of producing ozone by using vaporized liquid oxygen as the raw material is provided in industry.
However, the existing ozone generator and the method for producing ozone still have the problems of low ozone yield, high pure oxygen raw material cost, difficult storage and danger. In addition, in the operation process of the high-voltage discharge type ozone generator, the temperature of the equipment is high, so that the ozone is easily decomposed, and the ozone yield is seriously influenced.
Disclosure of Invention
In order to solve the problems, the invention provides an ozone production system for improving the yield of ozone and a method for producing ozone by the ozone production system.
In a first aspect, the present invention provides an ozone production system for increasing ozone production, the ozone production system comprising an air pretreatment device, an oxygen supply device and an ozone generator; the air pretreatment device is sequentially provided with an air compressor, an oil-water separator, a cold dryer, a suction dryer, an air filter and a pressure reducing valve; the oxygen supply device comprises a liquid oxygen vaporizer, gasified oxygen is merged into a gas transmission pipeline after a pressure reducing valve, and the gasified oxygen is mixed with air and then enters an ozone generator; the ozone generator comprises a plurality of reaction chambers, wherein a high-voltage electrode plate, a low-voltage electrode plate and a cooling water pipe are arranged in each reaction chamber, and mixed gas of oxygen and air is introduced into each reaction chamber in a parallel connection mode.
Optionally, the ozone generator is horizontal, and the specific shape of the ozone generator can be a horizontal cube or a horizontal cylinder;
optionally, a raw material gas inlet and a gas generating port are respectively arranged at two ends of the ozone generator, the mixed gas of oxygen and air is input into the ozone generator from the raw material gas inlet, and the generated ozone is output from the gas generating port and then input into other equipment needing ozone, such as a sterilizer, sewage treatment equipment and the like.
Optionally, the ozone generator includes a plurality of reaction chambers, and the arrangement direction of the reaction chambers is a direction from the raw material inlet to the gas generating port, that is, an axial direction of the ozone generator. And the two side wall surfaces of the reaction chamber are respectively provided with a high-voltage electrode plate and a low-voltage electrode plate.
Optionally, a gap is left between the partition wall between the two reaction chambers and the bottom of the ozone generator, the height of the gap is 5-10cm, the gap forms a gas production channel communicated with each reaction chamber, the gas production channel is communicated with the gas production port of the last reaction chamber, and ozone generated by each reaction chamber passes through the inner space of the ozone generator and is discharged from the gas production port.
Optionally, one end of the raw material air inlet, which is located inside the ozone generator, is connected with a raw material air inlet pipeline, the raw material air inlet pipeline comprises a main pipe and a plurality of branch pipes thereon, the main pipe runs through each reaction chamber along the axial direction of the ozone generator, the branch pipes are located in the area of each reaction chamber, and each branch pipe is provided with a control valve.
Optionally, the raw material gas inlet pipeline is arranged at the middle lower part of the ozone generator, and preferably, the raw material gas inlet pipeline is arranged at the lower part of the ozone generator and is positioned above the gas production channel.
Optionally, the top of each reaction chamber is provided with an air extraction port, and each air extraction port is provided with a control valve and is connected with an air extraction pump outside the ozone generator.
Optionally, the pressure provided by the pumping port enables the raw material gas to flow upward while avoiding pumping the generated ozone upward.
Optionally, the surface of the high-voltage electrode plate and/or the low-voltage electrode plate is corrugated, and preferably, the surface of the dielectric plate located between the high-voltage electrode plate and the low-voltage electrode plate is also corrugated.
Optionally, the cooling water pipe is disposed on a wall surface between adjacent reaction chambers, that is, between the high-voltage electrode plate and the low-voltage electrode plate of different reaction chambers, for cooling. The cooling water pipe can adopt two forms by matching with the corrugated high-voltage electrode plate and the corrugated low-voltage electrode plate, the first cooling water pipe is parallel to the electrode plates and is corrugated, and the heat exchange area is increased; the second cooling water pipe is a horizontal straight pipe, is perpendicular to the electrode plates and is perpendicular to the axial direction of the ozone generator, and the cooling water pipes are arranged between the adjacent reaction chambers from top to bottom and are positioned at the concave positions of the corrugated electrode plates, so that the heat exchange efficiency is improved.
Optionally, the oxygen supply device includes a liquid oxygen storage tank and a liquid oxygen vaporizer, liquid oxygen in the liquid oxygen storage tank is input into the liquid oxygen vaporizer, oxygen generated after the liquid oxygen is vaporized is merged into the gas transmission pipeline after the pressure reducing valve, and the oxygen is mixed with clean air reaching a certain stable state and then enters the ozone generator.
Optionally, the ozone production system further comprises a first heat exchanger, a first pipeline of the first heat exchanger is connected between the liquid oxygen storage tank and the liquid oxygen vaporizer, liquid oxygen with lower temperature is introduced, a second pipeline of the first heat exchanger is connected with a water inlet and a water outlet of a cooling water pipe of the ozone generator, cooling water with higher temperature is introduced, and the cooling water and the liquid oxygen are cooled by heat exchange and then are re-input into the cooling water pipe of the ozone generator to play a cooling role.
Optionally, the ozone production system further comprises a circulating water cooling device, and specifically comprises a circulating water tank, a circulating water pump and a second heat exchanger, wherein the water outlet of the cooling water pipe of the ozone generator is sequentially connected with the first pipeline of the second heat exchanger and the water inlet of the circulating water tank, and the water outlet of the circulating water tank is sequentially connected with the circulating water pump, the second pipeline of the second heat exchanger and the water inlet of the cooling water pipe, so that the heat exchange and cooling of the cooling water pipe are realized.
In a second aspect, the present invention further provides a method for producing ozone, wherein the method utilizes the above ozone production system, and specifically comprises the following steps:
(1) raw material air is treated by the air pretreatment device to obtain clean and stable air, and liquid oxygen is gasified by the oxygen supply device to obtain oxygen;
(2) the oxygen is merged into a gas transmission pipeline after the pressure reducing valve, and is mixed with air at a certain pressure and proportion to form raw material gas which enters the ozone generator;
(3) the raw material gas is input into the raw material gas inlet pipeline and is introduced between the high-voltage electrode plate and the low-voltage electrode plate of different reaction chambers;
(4) the extraction opening is used for extracting air from the reaction chamber participating in the reaction under certain pressure under the action of an air extraction pump so as to promote the raw material gas to move upwards;
(5) the high-voltage electrode plate and the low-voltage electrode plate are connected with proper voltage, so that oxygen reacts under high-voltage discharge to generate ozone, and meanwhile, the cooling water pipe cools a reaction chamber under the action of the first heat exchanger and the second heat exchanger;
(6) the generated ozone is output from the ozone generator through the gas generating channel and the gas generating port and is input into a device needing the ozone.
Optionally, in the step (2), the volume ratio of oxygen to air is 1 (1-4), and preferably, the volume ratio of oxygen to air is 1 (3-4). The oxygen supply amount is 100-400Nm3The intake flow rate of oxygen and air is 500-800Nm3/h, and preferably, the supply flow rate of oxygen is 100-200Nm3The intake flow rates of oxygen and air were 500-600Nm 3/h.
Optionally, in the step (2), the pressure of the oxygen is 0.18-0.25MPa, and preferably, the pressure of the oxygen is 0.18-0.20 MPa.
Optionally, in the step (3), the inlet temperature of the raw material gas is 0-40 ℃, and the inlet dew point is-45 ℃ to-70 ℃.
Optionally, in the step (1), the liquid oxygen vaporizer is selected according to the supply amount of the oxygen and the liquid oxygen in the step (2) with a balance of 20 to 30%.
Optionally, in the step (5), the temperature of the reaction chamber is 27 to 32 ℃, and the temperature of the effluent of the cooling water pipe from the ozone generator is 0 to 39 ℃.
Drawings
Fig. 1 is a schematic structural diagram of the ozone generator according to the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the ozone production system according to the embodiment of the present invention.
In the attached drawing, 1-an ozone generator, 2-a reaction chamber, 3-a high-pressure electrode plate, 4-a low-pressure electrode plate, 5-a dielectric plate, 6-an air extraction opening, 7-an air extraction pump, 8-an air production channel, 9-a raw material air inlet pipeline, 901-a main pipe, 902-a branch pipe, 10-a cooling water pipe, 11-an air compressor, 12-an oil-water separator, 13-a cold dryer, 14-a suction dryer, 15-an air filter, 16-a pressure reducing valve, 17-a liquid oxygen vaporizer, 18-a liquid oxygen storage tank, 19-a first heat exchanger, 20-a circulating water tank, 21-a circulating water pump and 22-a second heat exchanger.
Detailed Description
Example 1
This embodiment provides an ozone production system for increasing ozone production, as shown in fig. 1-2, the ozone production system includes an air pretreatment device, an oxygen supply device, and an ozone generator 1; the air pretreatment device is sequentially provided with an air compressor 11, an oil-water separator 12, a cold dryer 13, a suction dryer 14, an air filter 15 and a pressure reducing valve 16; the oxygen supply device comprises a liquid oxygen vaporizer 17, gasified oxygen is merged into a gas transmission pipeline after a pressure reducing valve, and the gasified oxygen is mixed with air and then enters the ozone generator 1; the ozone generator 1 comprises a plurality of reaction chambers 2, wherein a high-voltage electrode plate 3, a low-voltage electrode plate 4 and a cooling water pipe 10 are arranged in each reaction chamber, and mixed gas of oxygen and air is introduced into each reaction chamber 2 in a parallel connection mode.
In some embodiments, the shape of the ozone generator is horizontal, and the specific shape can be a horizontal cube or a cylinder;
in some embodiments, the two ends of the ozone generator are respectively provided with a raw material inlet and an air outlet, the mixed gas of oxygen and air is input into the ozone generator 1 from the raw material inlet, and the generated ozone is output from the air outlet and input into other equipment requiring ozone, such as a sterilizer, sewage treatment equipment, and the like.
In some embodiments, the ozone generator 1 comprises a plurality of reaction chambers 2, and the reaction chambers are arranged in a direction from the raw material inlet to the gas generating port, i.e. in an axial direction of the ozone generator. And two side wall surfaces of the reaction chamber 2 are respectively provided with a high-voltage electrode plate 3 and a low-voltage electrode plate 4.
In some embodiments, a gap is left between the partition wall between the two reaction chambers and the bottom of the ozone generator, the height of the gap is 5-10cm, the gap forms a gas production channel 8 communicated with each reaction chamber, the gas production channel is communicated with the gas production port of the last reaction chamber, and ozone produced by each reaction chamber passes through the inner space of the ozone generator and is discharged from the gas production port.
Compared with the traditional pot-type ozone generator which reacts in the same reaction tank, the ozone generator provided by the invention comprises a plurality of reaction chambers, so that raw material gas is distributed in different reaction chambers, the utilization rate of the raw material gas is improved, and the ozone yield is further improved.
In some embodiments, the raw material inlet is connected to a raw material inlet pipe 9 at one end inside the ozone generator, the raw material inlet pipe comprises a main pipe 901 and a plurality of branch pipes 902 thereon, the main pipe is along the axial direction of the ozone generator and penetrates through each reaction chamber 2, the branch pipes are located in the area of each reaction chamber, and each branch pipe 902 is provided with a control valve.
In some embodiments, the raw material inlet pipe 9 is disposed at the middle lower part of the ozone generator, and preferably, the raw material inlet pipe 9 is disposed at the lower part of the ozone generator 1 and above the gas generation channel 8.
In some embodiments, 1 to 3 branch pipes 902 are arranged in the region of each reaction chamber, and the mixed gas of oxygen and air, i.e. the raw material gas, enters the ozone generator through the raw material inlet, is conveyed to different reaction chambers along the main pipe 901 of the raw material inlet pipe, and then enters the corresponding reaction chambers through the branch pipes 902, and reacts to generate ozone under the discharge action of the high-voltage and low-voltage electrode plates.
In some embodiments, the top of each reaction chamber is provided with a pumping port 6, each pumping port is provided with a control valve and is connected with a pumping pump 7 outside the ozone generator, and all the pumping ports may be connected with the same pumping pump, or one pumping pump may be configured for each pumping port.
In some embodiments, the pressure provided by the pumping port 6 allows the raw material gas to flow upward while avoiding pumping the generated ozone upward. The air exhaust port 6 is responsible for forming a certain degree of negative pressure in the corresponding reaction chamber 2, so that the raw material gas supplied by the branch pipe 902 can enter the reaction chamber from below, and simultaneously, the density of the generated ozone is greater than that of air and oxygen, and the generated ozone is not influenced by the air exhaust port, settles to the bottom of the reaction chamber, and is discharged from the gas generation channel.
In order to improve the conversion efficiency of oxygen and the ozone yield, the ozone generator 1 of the invention is improved in terms of structure: (1) the reaction space in the ozone generator 1 is divided into a plurality of reaction chambers 2, and the raw material gas is supplied to different reaction chambers to simultaneously carry out discharge reaction, so that the utilization rate of the raw material gas is improved; (2) the raw material gas inlet pipeline 9 is positioned at the middle lower part of the reaction chamber and is matched with the air extraction opening 6, so that oxygen passes through the high-voltage electrode plate and the low-voltage electrode plate from bottom to top, and because the density of ozone is greater than that of oxygen and air, the ozone is gathered to the lower part of the reaction chamber in a natural state, and thus, raw material gas is primarily separated from generated ozone; (3) the condition that oxygen moves upwards is controlled by controlling the negative pressure of the air suction opening 6, so that the oxygen passes through the high-voltage electrode plate and the low-voltage electrode plate at a proper speed, and the sedimentation of ozone is not influenced; (4) the gas production channel 8 is matched with the gas inlet of the raw material gas inlet pipeline 9 and the gas extraction of the gas extraction opening 6, and conveys out the product ozone settled at the bottom of the ozone generator; (5) the plurality of reaction chambers 2 and the branch pipe 902 of the raw material inlet pipe are matched with each other, so that the ozone generator can adjust the productivity in multiple dimensions at any time according to the ozone amount required actually.
In some embodiments, the surface of the high-voltage electrode plate 3 and/or the low-voltage electrode plate 4 is corrugated, and preferably, the surface of the dielectric plate 5 located between the high-voltage electrode plate and the low-voltage electrode plate is also corrugated, so that the disturbance situation of oxygen in the reaction chamber during movement can be increased, and the reaction efficiency can be improved. The high-voltage electrode plate and the low-voltage electrode plate are connected with an external power supply device to provide proper voltage. The dielectric plate 5 is glass, enamel or ceramic.
In some embodiments, the cooling water pipe 10 is disposed on the wall surface between adjacent reaction chambers, i.e. between the high-voltage electrode plate and the low-voltage electrode plate of different reaction chambers, for cooling. The cooling water pipe 10 can adopt two forms by matching with the corrugated high-voltage electrode plate and the corrugated low-voltage electrode plate, the first cooling water pipe is parallel to the electrode plates and is corrugated, and the heat exchange area is increased; the second cooling water pipe is a horizontal straight pipe, is perpendicular to the electrode plates and is perpendicular to the axial direction of the ozone generator, and the cooling water pipes 10 are arranged between the adjacent reaction chambers from top to bottom and are positioned at the concave positions of the corrugated electrode plates, so that the heat exchange efficiency is improved.
The electrode plates and the cooling water pipe are matched with each other in structural characteristics, so that the heat dissipation and cooling effects can be greatly improved, the temperature of the reaction chamber is reduced, the generated ozone is prevented from being decomposed due to high temperature, and the ozone yield is further improved.
In some embodiments, the air pre-treatment device is provided with an air compressor 11, an oil-water separator 12, a freeze dryer 13, a suction dryer 14, an air filter 15 and a pressure reducing valve 16 in sequence, and the air can enter the ozone generator 1 at a suitable humidity, temperature and pressure after being treated by the air pre-treatment device.
In some embodiments, the oxygen supply apparatus comprises a liquid oxygen storage tank 18 and a liquid oxygen vaporizer 17, wherein liquid oxygen in the liquid oxygen storage tank is input into the liquid oxygen vaporizer, oxygen generated after liquid oxygen vaporization is merged into the gas transmission pipeline after a pressure reducing valve 16, and the oxygen is mixed with clean air reaching a certain steady state and then enters the ozone generator.
In some embodiments, a gas flow meter, a temperature sensor, and a pressure sensor are disposed in the gas transmission pipeline after the pressure reducing valve 16 to measure the flow rate, temperature, and humidity of the mixed gas of oxygen and air, and then the gas transmission pipeline is connected to the raw material inlet of the ozone generator to input the raw material gas under a certain ratio, pressure, temperature, and humidity into the ozone generator.
In some embodiments, the ozone production system further comprises a first heat exchanger 19, a first pipeline of the first heat exchanger is connected between the liquid oxygen storage tank 18 and the liquid oxygen vaporizer 17, liquid oxygen with a lower temperature is introduced, a second pipeline of the first heat exchanger is connected with a water inlet and a water outlet of the cooling water pipe 10 of the ozone generator, cooling water with a higher temperature is introduced, and the cooling water is re-introduced into the cooling water pipe of the ozone generator after exchanging heat with the liquid oxygen and reducing the temperature, so as to play a cooling role.
In some embodiments, the ozone production system further includes a circulating water cooling device, specifically including a circulating water tank 20, a circulating water pump 21 and a second heat exchanger 22, a water outlet of the cooling water pipe 10 of the ozone generator is sequentially connected to a first pipeline of the second heat exchanger 22 and a water inlet of the circulating water tank 20, and a water outlet of the circulating water tank 20 is sequentially connected to a second pipeline of the circulating water pump 21 and the second heat exchanger 22 and a water inlet of the cooling water pipe 10, so as to realize heat exchange and temperature reduction of the cooling water pipe.
The first heat exchanger 19 and the second heat exchanger 22 are designed, so that the cooling capacity of circulating water and liquid oxygen can be comprehensively utilized to cool the ozone generator in time, the structural characteristics of the cooling water pipe in the ozone generator can be matched and supplemented, the reaction chamber can be continuously and fully cooled, and the ozone yield is improved.
Example 2
The present embodiment also provides a method for producing ozone, which uses the ozone production system described in embodiment 1, and specifically includes the following steps:
(1) raw material air is treated by an air pretreatment device to obtain clean and stable air, and liquid oxygen is gasified by an oxygen supply device to obtain oxygen;
(2) oxygen is merged into the gas transmission pipeline after the pressure reducing valve, the pressure of the oxygen is 0.18MPa, the volume ratio of the oxygen to the air is 1:1, and the average supply amount of the oxygen and the air is 300Nm3Mixing oxygen with air to form raw material gas, and feeding the raw material gas into an ozone generator;
(3) raw material gas is input into a raw material gas inlet pipeline and is introduced between a high-voltage electrode plate and a low-voltage electrode plate of different reaction chambers, the gas inlet temperature is 40 ℃, and the gas inlet dew point is-45 ℃;
(4) the pumping hole pumps the reaction chamber which participates in the reaction under the action of a pumping pump at the pressure of 0.005MPa, so that the raw material gas moves upwards;
(5) the high-voltage electrode plate and the low-voltage electrode plate are connected with high-frequency voltage, so that oxygen reacts under high-voltage discharge to generate ozone, and meanwhile, the cooling water pipe cools the reaction chamber under the action of the first heat exchanger and the second heat exchanger, so that the temperature of the reaction chamber is ensured to be 30 ℃, and the temperature of effluent of the cooling water pipe flowing out of the ozone generator is 39 ℃;
(6) the generated ozone is output from the ozone generator through the gas generating channel and the gas generating port and is input into the organic silicon sewage treatment device.
In the step (1), the liquid oxygen vaporizer is selected with a margin of 20% in accordance with the amount of oxygen and liquid oxygen supplied in the step (2).
Example 3
This example provides a method for producing ozone using the ozone production system of example 1, the method comprising the step (2): oxygen is incorporated into the gas transmission pipeline after the pressure reducing valve, the oxygen pressure is 0.25MPa, the volume ratio of oxygen to air is 1:1, and the oxygen supply amount is 300Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
(4) the pumping hole pumps the reaction chamber which participates in the reaction under the action of a pumping pump at the pressure of 0.009MPa, so that the raw material gas is promoted to move upwards;
the other steps were the same as in example 2.
Example 4
This example provides a method for producing ozone using the ozone production system of example 1, the method comprising the step (2): oxygen is incorporated into the gas transmission pipeline after the pressure reducing valve, the oxygen pressure is 0.20MPa, the volume ratio of the oxygen to the air is 1:1, and the oxygen supply amount is 300Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
(4) the extraction opening is used for extracting air from the reaction chamber participating in the reaction under the action of an air extraction pump at the pressure of 0.007MPa so as to promote the raw material gas to move upwards;
the other steps were the same as in example 2.
Example 5
This example provides a method for producing ozone using the ozone production system of example 1, the method comprising the step (2): oxygen is incorporated into the gas line after the pressure reducing valve, the oxygen pressure is 0.20MPa, the volume ratio of oxygen to air is 1:2, and the oxygen supply is 300Nm3Air supply 400Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
the other steps are the same as in example 4.
Example 6
This example provides a method for producing ozone using the ozone production system of example 1, the method comprising the step (2): oxygen is merged into the gas transmission pipeline after the pressure reducing valve, the oxygen pressure is 0.20MPa, the volume ratio of the oxygen to the air is 1:3, and the oxygen supply amount is 200Nm3Air supply of 600Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
the other steps are the same as in example 4.
Example 7
This example provides a method for producing ozone using the ozone production system of example 1, the method comprising the step (2): oxygen is merged into the gas transmission pipeline after the pressure reducing valve, the oxygen pressure is 0.20MPa, the volume ratio of the oxygen to the air is 1:4, and the oxygen supply amount is 150Nm3Air supply of 600Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
the other steps are the same as in example 4.
Example 8
This example provides a method for producing ozone using the ozone production system of example 1, wherein in step (5), the temperature of the reaction chamber is 32 ℃.
The other steps were the same as in example 7.
Comparative example 1
This comparative example provides a method for producing ozone using the ozone production system described in example 1, step (2) of the method: oxygen is merged into the gas transmission pipeline after the pressure reducing valve, the oxygen pressure is 0.20MPa, the volume ratio of the oxygen to the air is 2:1, and the oxygen supply amount is 400Nm3Air supply 200Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
the other steps are the same as in example 4.
Comparative example 2
This comparative example provides a method for producing ozone using the ozone production system described in example 1, step (2) of the method: oxygen is merged into the gas transmission pipeline after the pressure reducing valve, the oxygen pressure is 0.20MPa, the volume ratio of the oxygen to the air is 3:1, and the oxygen supply amount is 600Nm3Air supply 200Nm3Mixing oxygen and air to form raw material gas, and feeding the raw material gas into an ozone generator;
the other steps are the same as in example 4.
Comparative example 3
This comparative example provides a method of producing ozone using the ozone production system of example 1, the method comprising: (1) the raw material air is treated by an air pretreatment device to obtain clean and stable air;
(2) air is introduced into the ozone generator at a pressure of 0.2MPa and a supply of 600Nm3；
(3) Air is input into a raw material inlet pipeline and is introduced between the high-voltage electrode plate and the low-voltage electrode plate of different reaction chambers;
(4) the air extraction port is used for extracting air from the reaction chamber participating in the reaction under the action of an air extraction pump at the pressure of 0.007MPa so as to promote the air to move upwards;
steps (5) to (6) were the same as in example 4.
Comparative example 4
This comparative example provides a method for producing ozone, in which the pressure, amount, ratio and voltage of oxygen gas and air used were the same as in example 4, and the air pretreatment apparatus and oxygen supply apparatus of the ozone production system used were the same as in example 4. The difference is that the comparison example uses a common ozone generator, namely a common horizontal ozone generator, only a whole cavity in the generator is used as a reaction chamber, an air suction port and a raw material inlet pipeline are not arranged, and the high-voltage electrode plate and the low-voltage electrode plate are flat electrodes.
TABLE 1 comparison of the effects of examples 2 to 8 and comparative examples 1 to 4
| Ozone yield (kg/h) | Cost of liquid oxygen (yuan) | |
| Example 2 | 28.5 | 342.9 |
| Example 3 | 28.0 | 342.9 |
| Example 4 | 30.2 | 342.9 |
| Example 5 | 29.7 | 342.9 |
| Example 6 | 28.9 | 228.6 |
| Example 7 | 29.0 | 171.4 |
| Example 8 | 29.4 | 171.4 |
| Comparative example 1 | 28.7 | 457.1 |
| Comparative example 2 | 28.7 | 685.7 |
| Comparative example 3 | 21.6 | 342.9 |
| Comparative example 4 | 19.4 | 342.9 |
As can be seen from the above table, when the volume ratio of oxygen to air is 1 (1-2), the ozone yield of examples 2-5 reaches 28-30 kg/h; as the volume ratio of oxygen to air increases, the ozone production of examples 6-8 is 28-29kg/h, which is equivalent to the level of the above examples, however, the amount of oxygen used is slightly lower, the economic benefit is significant, the liquid oxygen cost of examples 7-8 is reduced by half compared to the above examples, and the ozone production is substantially equal. Comparative examples 1-2 are to further increase the oxygen ratio, ozone yield does not basically promote, economic benefits are obviously reduced, and when the oxygen amount is large, the dielectric is easy to break down, and the safety factor is low. Comparative examples 3 and 4 are experiments without oxygen and the ozone generator of the present invention, respectively, and the ozone production is significantly reduced. Therefore, the ozone production system for improving the ozone yield and the method for producing ozone can improve the ozone yield and obtain good economic benefits.
Claims (7)
1. An ozone production system for improving ozone yield comprises an air pretreatment device, an oxygen supply device and an ozone generator, wherein the air pretreatment device is sequentially provided with an air compressor, an oil-water separator, a cold dryer, a suction dryer, an air filter and a pressure reducing valve;
the ozone generator comprises a plurality of reaction chambers, wherein a high-voltage electrode plate, a low-voltage electrode plate and a cooling water pipe are arranged in each reaction chamber, and mixed gas of oxygen and air is introduced into each reaction chamber in a parallel connection mode;
both ends of the ozone generator are respectively provided with a raw material air inlet and a gas generating port;
the arrangement direction of a plurality of reaction chambers of the ozone generator is the direction from a raw material air inlet to an air generating port, and a high-voltage electrode plate and a low-voltage electrode plate are respectively arranged on two side wall surfaces of each reaction chamber;
a gap is reserved between the partition wall between the two reaction chambers and the bottom of the ozone generator, the height of the gap is 5-10cm, a gas production channel communicated with each reaction chamber is formed in the gap, and the gas production channel is communicated with a gas production port of the last reaction chamber;
one end of the raw material air inlet positioned in the ozone generator is connected with a raw material air inlet pipeline, and the raw material air inlet pipeline is arranged at the middle lower part of the ozone generator and positioned above the gas production channel;
the raw material gas inlet pipeline comprises a main pipe and a plurality of branch pipes, the main pipe runs through each reaction chamber along the axial direction of the ozone generator, the branch pipes are positioned in the area of each reaction chamber, and each branch pipe is provided with a control valve;
the top of each reaction chamber is provided with an air extraction opening, and each air extraction opening is provided with a control valve and is connected with an air extraction pump outside the ozone generator;
the pressure provided by the pumping port enables the raw material gas to flow upwards, and simultaneously prevents the generated ozone from being pumped upwards.
2. The ozone production system of claim 1, wherein the surfaces of the high-voltage electrode plates and/or the low-voltage electrode plates are corrugated, and the surfaces of the dielectric plates located between the high-voltage electrode plates and the low-voltage electrode plates are also corrugated; the cooling water pipe is arranged on the wall surface between the adjacent reaction chambers.
3. The ozone production system of claim 2, wherein the cooling water pipe is parallel to the electrode plate and is corrugated;
or the cooling water pipe is a horizontal straight pipe, is perpendicular to the electrode plates and is perpendicular to the axial direction of the ozone generator, and the cooling water pipe is arranged between the adjacent reaction chambers from top to bottom and is positioned at the concave position of the corrugated electrode plate.
4. The ozone production system as claimed in claim 1, wherein the oxygen supply device comprises a liquid oxygen storage tank and a liquid oxygen vaporizer, wherein liquid oxygen in the liquid oxygen storage tank is fed into the liquid oxygen vaporizer, and oxygen generated after the liquid oxygen is vaporized is merged into the gas transmission pipeline after the pressure reducing valve and is fed into the ozone generator after being mixed with air;
the ozone production system also comprises a first heat exchanger, wherein a first pipeline of the first heat exchanger is connected between the liquid oxygen storage tank and the liquid oxygen vaporizer, liquid oxygen with lower temperature is introduced, a second pipeline of the first heat exchanger is connected with a water inlet and a water outlet of a cooling water pipe of the ozone generator, cooling water with higher temperature is introduced, and the cooling water is re-input into the cooling water pipe of the ozone generator after heat exchange and temperature reduction with the liquid oxygen to play a cooling role;
the ozone production system further comprises a circulating water cooling device, and specifically comprises a circulating water tank, a circulating water pump and a second heat exchanger, wherein the water outlet of the cooling water pipe of the ozone generator is sequentially connected with the first pipeline of the second heat exchanger and the water inlet of the circulating water tank, and the water outlet of the circulating water tank is sequentially connected with the second pipeline of the circulating water pump and the second heat exchanger and the water inlet of the cooling water pipe, so that the heat exchange and cooling of the cooling water pipe are realized.
5. A method for producing ozone, characterized in that the method utilizes the ozone production system of any one of claims 1 to 4, comprising the steps of:
(1) raw material air is treated by the air pretreatment device to obtain clean and stable air, and liquid oxygen is gasified by the oxygen supply device to obtain oxygen;
(2) the oxygen is merged into a gas transmission pipeline after the pressure reducing valve, and is mixed with air at a certain pressure and proportion to form raw material gas which enters the ozone generator;
(3) the raw material gas is input into the raw material gas inlet pipeline and is introduced between the high-voltage electrode plate and the low-voltage electrode plate of different reaction chambers;
(4) the extraction opening is used for extracting air from the reaction chamber participating in the reaction under certain pressure under the action of an air extraction pump so as to promote the raw material gas to move upwards;
(5) the high-voltage electrode plate and the low-voltage electrode plate are connected with proper voltage, so that oxygen reacts under high-voltage discharge to generate ozone, and meanwhile, the cooling water pipe cools a reaction chamber under the action of the first heat exchanger and the second heat exchanger;
(6) the generated ozone is output from the ozone generator through the gas generating channel and the gas generating port and is input into a device needing the ozone.
6. The method for producing ozone as claimed in claim 5, wherein the volume ratio of oxygen to air in the step (2) is 1 (1-4), and the oxygen supply amount is 100-400Nm3/h。
7. The method for producing ozone as claimed in claim 5, wherein the pressure of the oxygen in the step (2) is 0.18 to 0.25 MPa.
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