CN217482528U - Constant-pressure capacity measuring device - Google Patents
Constant-pressure capacity measuring device Download PDFInfo
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- CN217482528U CN217482528U CN202221346779.9U CN202221346779U CN217482528U CN 217482528 U CN217482528 U CN 217482528U CN 202221346779 U CN202221346779 U CN 202221346779U CN 217482528 U CN217482528 U CN 217482528U
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Abstract
The application relates to a constant-pressure capacity measuring device, which relates to the technical field of gas reaction measurement and comprises a first measuring tank, a second measuring tank, a reaction tank and a constant-pressure gas distribution mechanism; measuring liquid is arranged in the first measuring tank and the second measuring tank, the first measuring tank is communicated with the second measuring tank through a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are connected in parallel, the constant-pressure air distribution mechanism is communicated with the first connecting pipe, and the second measuring tank is communicated with the reaction tank through a third connecting pipe; a first valve is arranged on the first connecting pipe, a second valve is arranged on the second connecting pipe, and a third valve is arranged on the third connecting pipe; the ports of the first connecting pipe and the third connecting pipe are positioned above the liquid level, and one port of the second connecting pipe is positioned below the liquid level. When the second valve and the third valve are opened and the first valve is closed, the change of the measuring liquid in the first measuring tank and the second measuring tank is measured to deduce the gas change in the reaction tank; the pressure in the reaction tank is in a constant pressure state.
Description
Technical Field
The application relates to the technical field of gas reaction measurement, in particular to a constant-pressure capacity measuring device.
Background
In laboratory or small scale production, it is often necessary to measure the amount of gas consumed or produced by the reaction; common methods are piston method and pressure measurement method. The piston method, i.e., the constant volume condition, is determined by the product of the stroke of the piston and the cross section of the cylinder. The pressure measurement method is to measure the pressure before and after the reaction gas is generated under the condition of constant volume, thereby calculating the loss and generation of the reaction gas.
In view of the above-mentioned related art, the piston method is suitable for a reaction to a low pressure. The pressure measurement method is suitable for obvious reaction to pressure change. Neither is capable of accurately metering reactions of small variations, such as photocatalytic reactions.
Disclosure of Invention
The object of the present application is to provide a constant pressure capacity measuring device for accurately measuring the volume of gas consumed or added by a reaction under constant pressure (including high and low pressure).
The application provides a constant voltage capacity measuring device adopts following technical scheme:
constant voltage capacity measuring device includes: the device comprises a first measuring tank, a second measuring tank, a reaction tank and a constant-pressure gas distribution mechanism; the first measuring tank and the second measuring tank are internally provided with measuring liquid, the first measuring tank is communicated with the second measuring tank through a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are connected in parallel, the constant-pressure air distribution mechanism is communicated with the first connecting pipe, and the second measuring tank is communicated with the reaction tank through a third connecting pipe; a first valve is arranged on the first connecting pipe, a second valve is arranged on the second connecting pipe, and a third valve is arranged on the third connecting pipe; the ports of the first connecting pipe and the third connecting pipe are located above the liquid level, and one port of the second connecting pipe is located below the liquid level.
By adopting the technical scheme, when the first valve and the third valve are opened and the second valve is closed, the first measuring tank, the second measuring tank, the reaction tank and the constant-pressure gas distribution mechanism are communicated, and reaction gas is filled in the first measuring tank, the second measuring tank and the reaction tank and is kept in a constant-pressure state;
when the gas in the reaction tank increases or decreases in volume due to reaction, the measurement liquid flows between the first measurement tank and the second measurement tank through the second connecting pipe, the gas consumption or increase in volume in the reaction tank can be deduced by measuring the volume change of the measurement liquid in the first measurement tank and the second measurement tank, the volume change of the measurement liquid can be directly obtained, the weight change can also be obtained by obtaining the weight change firstly, and the volume change is obtained by calculating the density of the measurement liquid; and in the gas reaction process in the reaction tank, the gas pressure in the reaction tank is equal to that of the second measurement tank, the gas pressure of the first measurement tank is equal to that of the constant-pressure gas distribution mechanism, the pressure difference between the first measurement tank and the second measurement tank is the pressure difference corresponding to the height difference that the liquid level in the second connecting pipe is higher than the liquid level in the tank, when the liquid with the lower density is selected as the measurement liquid and the liquid with the equal density is used, the horizontal height of the highest point of the second connecting pipe is reduced relative to the height difference of the liquid level in the insertion tank, the pressure difference between the first measurement tank and the second measurement tank is approximately zero, and therefore the gas pressure in the reaction tank is in an approximately constant pressure state before and after the reaction.
Optionally, the bottom of the first measuring tank and the bottom of the second measuring tank are provided with weighing mechanisms.
By adopting the technical scheme, the gas change in the reaction tank can be measured in real time.
Optionally, a drying tank is further disposed on the third connecting pipe.
Through adopting above-mentioned technical scheme, can enough reduce to measure liquid and get into the retort, reduce the influence to the reaction, can reduce again that the steam that the reaction produced in the retort gets into in first measurement jar and the second measurement jar, produce the influence to measuring result.
Optionally, a first pressure gauge is arranged at a joint of the constant pressure air distribution mechanism and the first connecting pipe, and a second pressure gauge is arranged on the third connecting pipe.
By adopting the technical scheme, the first pressure gauge can be used for detecting and displaying the pressure intensity in the first measuring tank in real time, and the second pressure gauge can be used for measuring and displaying the pressure intensity in the reaction tank after the reaction starts in real time.
Optionally, constant voltage valve mechanism includes that a plurality of admits air unit, blending tank and joins in marriage the gas pitcher, a plurality of admit air the unit and connect in parallel to connect gradually with blending tank, distribution tank and first measurement jar, it still is provided with the steady voltage relief pressure valve to join in marriage between gas pitcher and the first measurement jar.
By adopting the technical scheme, different reaction gases are guided into the mixing tank to be mixed and are stored in the guide gas distribution tank, and when reaction is needed, the mixed gas in the gas distribution tank is guided into the reaction tank through the first connecting pipe, the second measuring tank and the third connecting pipe to react; the pressure stabilizing and reducing valve controls the pressure of the mixed gas entering the first connecting pipe so as to adapt to the pressure required by different reactions.
Optionally, a pressurizing unit and a high-pressure tank are further arranged between the gas distribution tank and the first measuring tank, and the gas distribution tank, the pressurizing unit, the high-pressure tank, the pressure stabilizing and reducing valve and the first measuring tank are sequentially connected and arranged.
Through adopting above-mentioned technical scheme, carry out the pressure boost to the gas that enters into in the first connecting pipe to store with the constant voltage state, in order to provide the required high pressure condition of reaction for the retort.
Optionally, a safety valve is further disposed between the gas distribution tank and the high-pressure tank, and the safety valve is disposed in parallel with the pressurization unit.
By adopting the technical scheme, when the pressure in the high-pressure tank is too high, high-pressure gas can flow back into the gas distribution tank through the safety valve, so that safety can be ensured, and waste and pollution caused by reaction gas emission can be avoided.
Optionally, the air inlet unit includes an air storage tank, a filter, a pressure reducing valve, a flow meter and a check valve which are sequentially arranged along the air inlet direction.
By adopting the technical scheme, the gas in the gas storage tank firstly passes through the filter, magazines in the gas storage tank are filtered, then the pressure is reduced through the pressure reducing valve, the gas pressure is controlled, the gas passing through is metered by the flowmeter, and the gas is prevented from flowing back to the gas inlet unit from the gas distribution tank through the one-way valve.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the first valve and the third valve are opened and the second valve is closed, the first measuring tank, the second measuring tank, the reaction tank and the constant pressure gas distribution mechanism are communicated, and reaction gas is filled in the first measuring tank, the second measuring tank and the reaction tank and is kept in a constant pressure state;
2. when the gas in the reaction tank increases or decreases in volume due to reaction, the gas consumption or increase in the reaction tank can be deduced by measuring the weight change of the first measuring tank and the second measuring tank; the device converts the change of the volume into the change of the weight, increases the measurement precision (the precision is improved by about 2 orders of magnitude, for example, the precision can reach 0.001G when the electronic balance is adopted for measurement, and the volume is converted into 0.001ml, and the volume can not be measured almost), reduces the measurement difficulty, can be used for slow reaction, has small reactor volume, and is not easy to observe the measured chemical reaction;
3. when the variable quantity of the gas in the reaction tank is measured, the pressure difference between the first measurement tank and the second measurement tank is approximately zero, so that the pressure in the reaction tank and the pressure of the constant-pressure gas distribution mechanism are approximately zero, and the pressure in the reaction tank is approximately constant in the reaction and measurement processes and is in a constant-pressure state.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present application;
FIG. 2 is a schematic view of the overall structure of embodiment 2 of the present application;
in the figure, 1, a first measuring tank; 2. a second measurement tank; 3. a reaction tank; 4. a constant pressure air distribution mechanism; 41. an air intake unit; 411. A gas storage tank; 412. a filter; 413 a pressure reducing valve; 414. a flow meter; 415. a one-way valve; 42. a mixing tank; 43. a gas distribution tank; 44. a pressure stabilizing and reducing valve; 45. a pressurizing unit; 46. a high-pressure tank; 47. a safety valve; 5. a first connecting pipe; 51. a first valve; 52. a first pressure gauge; 6. a second connection pipe; 61. A second valve; 7. a third connecting pipe; 71. A third valve; 72. a drying tank; 73. And a second pressure gauge.
Detailed Description
The present application is described in further detail below with reference to fig. 1-2.
Example 1
A constant pressure volume measuring device, refer to fig. 1, comprises a first measuring tank 1, a second measuring tank 2, a reaction tank 3 and a constant pressure air distribution mechanism 4; the measuring device comprises a first measuring tank 1, a second measuring tank 2, a constant pressure air distribution mechanism 4, a first connecting pipe 5, a second connecting pipe 6, a third connecting pipe 7, a second measuring tank 2, a third connecting pipe 7 and a third connecting pipe 7, wherein measuring liquid is arranged in the first measuring tank 1 and the second measuring tank 2; a first valve 51 is arranged on the first connecting pipe 5, a second valve 61 is arranged on the second connecting pipe 6, and a third valve 71 is arranged on the third connecting pipe 7; the port of first connecting pipe 5 and third connecting pipe 7 is located more than the liquid level, the one end that second connecting pipe 6 and first measuring tank 1 are connected submerges in 1 jar internal liquid level below first measuring tank, and the one end of being connected with second measuring tank 2 is located more than 2 jar internal liquid levels of second measuring tank.
In the embodiment, for volume consumption reaction in the reaction tank 3, water is used as the measuring liquid; the compression ratio of liquid water is very small and close to zero, and the device is suitable for measurement under ultrahigh pressure conditions.
Firstly, opening a first valve 51 and a third valve 71, closing a second valve 61, filling a first measuring tank 1, a second measuring tank 2 and a reaction tank 3 with reaction gas by a constant-pressure gas distribution mechanism 4, and keeping the reaction gas in a constant-pressure state;
in the second step, the second valve 61 and the third valve 71 are opened, the first valve 51 is closed, and the first measuring tank 1 and the second measuring tank 2 are isolated by the measured liquid;
thirdly, the gas in the reaction tank 3 starts to react, the gas pressure in the reaction tank 3 is reduced along with the consumption of the gas, a pressure difference is formed between the first measuring tank 1 and the second measuring tank 2, and under the action of pressure, the water in the first measuring tank 1 is pressed into the second measuring tank 2 through the second connecting pipe 6 until the volume of the gas in the reaction tank 3 is not changed any more, and the pressure between the first measuring tank 1 and the second measuring tank 2 tends to be stable; the increase and decrease of the water in the first measuring tank 1 and the second measuring tank 2 are measured, and then the consumption of the gas in the reaction tank 3 is obtained through conversion, namely, each gram of water corresponds to each milliliter of gas.
When the gas consumed in the reaction tank 3 is measured by the device and the method, a system error and a random error exist, the random error is derived from an error which is considered to be measured for the increase and decrease of the water in the first measuring tank 1 and the second measuring tank 2, and the error is reduced by measuring the increase and decrease with an instrument with high precision as much as possible; the system error is that when water enters the second measuring tank 2 from the first measuring tank 1 through the second connecting pipe 6 under the action of pressure difference, a process of ascending and then descending exists, after the reaction is finished, the second connecting pipe is positioned in the first measuring tank 1, water is reserved in the second connecting pipe, and the part of water can be supplemented in subsequent conversion so as to eliminate the part of system error; or the pipe diameter of the second connecting pipe 6 is reduced, and the height difference between the highest position of the second connecting pipe 6 and the liquid level in the first measuring tank 1 is reduced, so that the partial error is reduced and can be ignored;
in the technical scheme, if the increase and decrease of water are directly measured, the tank body needs to be opened or set to be transparent and marked with scales, and the scales are directly read out; this is either troublesome or requires the tank body; therefore, the inventor thinks that, when solving the problem, the weighing mechanisms are arranged at the bottoms of the first measuring tank 1 and the second measuring tank 2, the weighing mechanisms exemplarily adopt electronic scales, the increase and decrease amount of the water in the first measuring tank 1 and the second measuring tank 2 obtains the weight difference through the electronic scales, and then the volume difference is converted through the density, so that the volume consumed by the gas in the reaction tank 3 is obtained.
The device converts the change of the volume into the change of the weight of water, increases the measurement precision (the precision is improved by about 2 orders of magnitude, for example, the precision can reach 0.001G when the electronic balance is adopted for measurement, and the volume is converted into 0.001ml, so that the volume can not be measured almost), reduces the measurement difficulty, and can be used for the chemical reaction with slow reaction, small reactor volume and difficult observation and measurement.
In the above technical solution, the measurement is affected by the liquid that is easy to evaporate, such as water or other liquid that is easy to evaporate, and the vapor generated by the reaction in the reaction tank 3, and the drying tank 72 is disposed on the third connecting pipe 7, so that the gas passing through the drying tank 72 is dried, and the influence of the part on the measurement is reduced.
A first pressure gauge 52 is arranged at the joint of the constant pressure air distribution mechanism 4 and the first connecting pipe 5, and is used for measuring the air pressure entering the first connecting pipe 5 (namely the air pressure required by the reaction); the third connecting pipe 7 is provided with a second pressure gauge 73 for wiping, measuring and displaying the real-time air pressure of the reaction tank 3.
The constant pressure valve mechanism 4 includes that a plurality of admits air unit 41, blending tank 42 and joins in marriage gas pitcher 43, a plurality of admit air unit 41 and connect in parallel to connect gradually with blending tank 42, distribution tank 43 and first measurement tank 1, join in marriage and still be provided with the steady voltage relief valve 44 between gas pitcher 43 and the first measurement tank 1.
When a plurality of reaction gases are mixed, the gases are respectively fed through the plurality of gas feeding units 41, mixed in the mixing tank 42 and stored in the gas distribution tank 43, and the pressure of the gas fed into the first connecting pipe 5 is limited and stabilized by the pressure stabilizing and reducing valve 44, so that the gas in the reaction tank 3 is in a constant pressure state during the reaction.
A pressurization unit 45 and a high-pressure tank 46 are further arranged between the gas distribution tank 43 and the first measurement tank 1, and the gas distribution tank 43, the pressurization unit 45, the high-pressure tank 46, the pressure stabilizing and reducing valve 44 and the first measurement tank 1 are sequentially connected; pressurizing, storing and maintaining the pressure of the gas entering the first connecting pipe 5 to provide high-pressure and constant-pressure reaction gas for the reaction tank 3; it is suitable for high-pressure and constant-pressure gas reaction.
A safety valve 47 is further arranged between the gas distribution tank 43 and the high-pressure tank 46, and the safety valve 47 is arranged in parallel with the pressurization unit 45; when the pressure in the high-pressure tank 46 exceeds the standard, the pressure is released by the safety valve 47, and the discharged gas is guided to the gas distribution tank 43.
The air inlet unit 41 comprises an air storage tank 411, a filter 412, a pressure reducing valve 413, a flow meter 414 and a one-way valve 415 which are arranged in sequence along the air inlet direction; the gas storage tank 411 is used for storing single type of reaction gas, when reaction is needed, the gas is firstly filtered by the filter 412, then pressure limiting and pressure stabilizing are carried out by the pressure reducing valve 413, the gas is guided into the first connecting pipe 5, the flow meter 414 can measure the gas guided into the first connecting pipe 5, and the gas in the first connecting pipe 5 is prevented from flowing back by the one-way valve 415.
Example 2:
a constant-pressure capacity measuring device, referring to fig. 2, the specific structure thereof is different from that of embodiment 1 in that: one end of the second connecting pipe 6 connected with the second measuring tank 2 is immersed below the liquid level in the second measuring tank 2; one end connected with the first measuring tank 1 is positioned above the liquid level in the first measuring tank 1.
The present example is applicable to the reaction taking place in the reaction tank 3 as a gas-increasing reaction: the measuring solution adopts water;
firstly, opening a first valve 51 and a third valve 71, closing a second valve 61, and filling reaction gas into a first measuring tank 1, a second measuring tank 2 and a reaction tank 3 by a constant-pressure gas distribution mechanism 4, wherein the reaction gas is in a constant-pressure state;
in the second step, the second valve 61 and the third valve 71 are opened, the first valve 51 is closed, and the first measuring tank 1 and the second measuring tank 2 are isolated by the measured liquid;
thirdly, the gas in the reaction tank 3 starts to react, the gas pressure in the reaction tank 3 rises along with the increase of the gas, a pressure difference is formed between the first measuring tank 1 and the second measuring tank 2, under the action of the pressure, the water in the second measuring tank 2 is pressed to the first measuring tank 1 through the second connecting pipe 6 until the volume of the gas in the reaction tank 3 is not changed any more, and the pressure between the first measuring tank 1 and the second measuring tank 2 tends to be stable; and measuring the increment of the water in the first measuring tank 1 or the decrement of the water in the second measuring tank 2, and then obtaining the increment of the gas in the reaction tank 3 by conversion, namely, each gram of water corresponds to each milliliter of gas.
The embodiments of the present disclosure are all preferred embodiments of the present disclosure, and the protection scope of the present disclosure is not limited thereby, wherein like parts are designated by like reference numerals. Therefore: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A constant pressure capacitance measuring device, comprising: the device comprises a first measuring tank (1), a second measuring tank (2), a reaction tank (3) and a constant pressure air distribution mechanism (4); measuring liquid is arranged in the first measuring tank (1) and the second measuring tank (2), the first measuring tank (1) and the second measuring tank (2) are communicated through a first connecting pipe (5) and a second connecting pipe (6), the first connecting pipe (5) and the second connecting pipe (6) are connected in parallel, the constant-pressure air distribution mechanism (4) is communicated with the first connecting pipe (5), and the second measuring tank (2) is communicated with the reaction tank (3) through a third connecting pipe (7); a first valve (51) is arranged on the first connecting pipe (5), a second valve (61) is arranged on the second connecting pipe (6), and a third valve (71) is arranged on the third connecting pipe (7); the ports of the first connecting pipe (5) and the third connecting pipe (7) are positioned above the liquid level, and one port of the second connecting pipe (6) is positioned below the liquid level.
2. The constant pressure capacity measuring device according to claim 1, wherein the bottom of the first measuring tank (1) and the second measuring tank (2) are provided with weighing means.
3. The constant pressure capacity measuring device according to claim 1, wherein a drying tank (72) is further provided on the third connecting pipe (7).
4. The constant pressure capacity measuring device according to claim 1, wherein a first pressure gauge (52) is arranged at the joint of the constant pressure air distribution mechanism (4) and the first connecting pipe (5), and a second pressure gauge (73) is arranged on the third connecting pipe (7).
5. The constant-pressure volume measuring device according to claim 1, wherein the constant-pressure air distribution mechanism (4) comprises a plurality of air inlet units (41), a mixing tank (42) and an air distribution tank (43), a plurality of air inlet units (41) are connected in parallel and are sequentially connected with the mixing tank (42), the air distribution tank (43) and the first measuring tank (1), and a pressure stabilizing and reducing valve (44) is further arranged between the air distribution tank (43) and the first measuring tank (1).
6. The constant-pressure volume measuring device according to claim 5, wherein a pressurization unit (45) and a high-pressure tank (46) are further arranged between the gas distribution tank (43) and the first measuring tank (1), and the gas distribution tank (43), the pressurization unit (45), the high-pressure tank (46), the pressure-stabilizing pressure-reducing valve (44) and the first measuring tank (1) are sequentially connected.
7. The constant pressure capacity measuring device according to claim 6, wherein a safety valve (47) is further provided between the gas distribution tank (43) and the high pressure tank (46), the safety valve (47) being provided in parallel with the pressurizing unit (45).
8. The constant-pressure capacity measuring device according to claim 5, wherein the air intake unit (41) comprises an air tank (411), a filter (412), a pressure reducing valve (413), a flow meter (414), and a check valve (415) which are arranged in this order in an air intake direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221346779.9U CN217482528U (en) | 2022-05-31 | 2022-05-31 | Constant-pressure capacity measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221346779.9U CN217482528U (en) | 2022-05-31 | 2022-05-31 | Constant-pressure capacity measuring device |
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| Publication Number | Publication Date |
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| CN217482528U true CN217482528U (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221346779.9U Active CN217482528U (en) | 2022-05-31 | 2022-05-31 | Constant-pressure capacity measuring device |
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| CN (1) | CN217482528U (en) |
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2022
- 2022-05-31 CN CN202221346779.9U patent/CN217482528U/en active Active
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