CN112354210A - Air pulse generating device of nuclear pulse extraction column - Google Patents
Air pulse generating device of nuclear pulse extraction column Download PDFInfo
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- CN112354210A CN112354210A CN202011016914.9A CN202011016914A CN112354210A CN 112354210 A CN112354210 A CN 112354210A CN 202011016914 A CN202011016914 A CN 202011016914A CN 112354210 A CN112354210 A CN 112354210A
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- cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
Abstract
An air pulse generating device of a nuclear pulse extraction column comprises a servo motor, an air cylinder and a linear sliding table; a piston rod of the cylinder is connected with a sliding platform of the linear sliding table; the bottom of the cylinder is provided with a four-way pipe which is respectively connected with a high-pressure air source, an emptying pipe and a pulse leg through an air pipeline and an electromagnetic valve; and an air cylinder pressure detection point and an air cylinder temperature detection point are arranged at the outlet of the air cylinder. The operating parameters of the device satisfy the formula:
wherein
As a function of the servo motor rotation angle time; p (t) is a servo motor power time function; p (t) is a function of in-cylinder pressure time, and T (t) is a function of in-cylinder temperature time. In the process of generating gas pulse, the invention does not exhaust outwards, thereby reducing the tail gas treatment workload of the pulse extraction column; gas pulse waveform real-timeAnd the method can generate any continuous gas waveform and has good operability.
Description
Technical Field
The invention relates to an air pulse generating device, in particular to an air pulse generating device of a nuclear pulse extraction column, and belongs to the technical field of power machinery.
Background
For the nuclear pulse extraction column, air pulse is generally adopted to input energy, and the nuclear pulse extraction column has the advantages of reliable work under high-level discharge and no maintenance. However, in the air pulse generator of a general pulse extraction column, a gas pulse is formed by selecting a rotary passage of a rotary valve using a constant pressure compressed air. Because the gas is continuously blown into the pulse leg of the pulse extraction column through the rotary valve, the pulse leg needs to be exhausted in order to ensure that the air in the pulse leg does not overflow. Because the gas in the pulse leg and the radioactive material liquid are violently vibrated, a large amount of radioactive nuclide is mixed in the gas, and the handling capacity and difficulty of radioactive tail gas can be increased when the gas is emptied.
Therefore, it is required to develop an air pulse generator for a nuclear pulse extraction column, which maintains the advantage of inputting energy to the pulse extraction column using air pulses, while not exhausting air to the outside during normal operation.
Disclosure of Invention
The invention aims to provide an air pulse generating device of a nuclear pulse extraction column, which can be used for the air pulse generating process of the pulse extraction column, so that the air pulse generating device does not exhaust outwards, and the radioactive tail gas treatment capacity is reduced.
The technical scheme of the invention is as follows:
the utility model provides an air pulse generating device of nuclear pulse extraction post which characterized in that: the device comprises a servo motor, a cylinder and a linear sliding table; an output shaft of the servo motor is connected with a rotating shaft of the linear sliding table; a piston rod of the cylinder is connected with a sliding platform of the linear sliding table; the bottom of the cylinder is provided with a four-way pipe which is respectively connected with a high-pressure air source, an emptying pipe and a pulse leg through an air pipeline and an electromagnetic valve; an air cylinder pressure detection point and an air cylinder temperature detection point are arranged at an air cylinder outlet;
the operating parameters of the device at the occurrence of an air pulse satisfy the following relationship:
in the formula：
As a function of the servo motor rotation angle time; p (t) is a servo motor power time function; p (t) is a function of in-cylinder pressure time, and T (t) is a function of in-cylinder temperature time; t is the running time; delta t is sampling time interval of a servo motor measurement and control system; k is a proportionality coefficient between the rotation angle of the servo motor and the displacement of the linear sliding table; n is the mass of the gas in the cylinder; r is an ideal gas constant; s is the cross-sectional area of the interior of the cylinder; and C is a rotation angle corresponding to the servo motor when the initial displacement of the linear sliding table is 0.
Further, the volume of the cylinder is at least 10 times the total volume of both the pulse leg gas line and the pulse leg.
Preferably, the axial direction of the cylinder is vertical, and the exhaust port of the cylinder faces downwards. And the outside of the cylinder is coated with a heat-insulating material.
The invention has the following advantages and prominent technical effects: the device does not exhaust air outwards when air pulse occurs, and the treatment capacity of radioactive tail gas is effectively reduced. Secondly, the gas pulse waveform is adjustable in real time, any continuous gas waveform can be generated, and the operability is good.
Drawings
Fig. 1 is a schematic structural principle diagram of an air pulse generator of a pulse extraction column provided by the invention.
In the figure: 1-a servo motor; 2-a sliding platform; 3-a cylinder; 4-four-way pipe; 5-high pressure gas source gas pipeline; 6-exhausting the gas pipeline; 7-pulse leg gas line; 8-cylinder pressure detection points; 9-cylinder temperature detection point; 10-a pulse leg; 11-pulsed extraction column.
Detailed Description
The construction principles and embodiments of the present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the structural principle of an air pulse generator of a pulse extraction column provided by the invention, and the air pulse generator comprises a servo motor 1, an air cylinder 3 and a linear sliding table; an output shaft of the servo motor 1 is connected with a rotating shaft of the linear sliding table; the piston rod of the cylinder is connected with the sliding platform 2 of the linear sliding table.
A four-way pipe 4 is arranged at the bottom of the cylinder, and one pipe of the four-way pipe is connected with a high-pressure gas source through a high-pressure gas source gas pipeline 5 and an electromagnetic valve; the other pipe is connected with an emptying pipe through an emptying gas pipeline 6 and an electromagnetic valve; the third pipe is connected with the pulse leg 10 through the pulse leg gas pipeline 7 and the electromagnetic valve.
The operating parameters of the device at the occurrence of an air pulse satisfy the following relationship:
in the formula:
as a function of the angular time of rotation of the servomotor,
can be set and measured on the control of the servo motor; p (t) is a servo motor power time function, and P (t) can be measured by a servo motor controller; p (t) is a time function of the pressure in the cylinder, and p (t) can be obtained by measuring a pressure detection point arranged in the cylinder; t (t) is a function of in-cylinder temperature over time; t is the running time; delta t is sampling time interval of the servo motor measurement and control system and is a constant; k is a proportional coefficient between the rotation angle of the servo motor and the displacement of the linear sliding table, and is a structural constant determined by mechanical design; n is the mass of the gas in the cylinder; r is an ideal gas constant; s is the cross-sectional area of the interior of the cylinder; and C is a rotation angle corresponding to the servo motor when the initial displacement of the linear sliding table is 0, and the rotation angle is a constant related to the mechanical structure design of the invention.
The working mechanism of the device for generating gas pulse is as follows:
when the mass of gas inside the cylinder is much larger than the mass of gas outside the cylinder (the volume of the cylinder is at least 10 times of the total volume of the pulse leg gas pipeline and the pulse leg), the pressure of the gas pulse will depend on the compression-expansion process of the gas inside the cylinder.
Let d (t) be the displacement time function of the piston driven by the servo motor, and d (t) 0 be the time when the piston is completely pressed into the cylinder; because the height of the pulse extraction column generally does not exceed 20 m, the required gas pulse pressure does not exceed 0.3 MPa; meanwhile, the air pulse device of the pulse extraction column adopts air as a gas medium, and the temperature is in a room temperature range. Under such conditions, the cylinder interior gas (air) can be regarded as an ideal gas. Therefore, the state of the gas in the cylinder in the case that the piston is stationary in the present invention can be described by an ideal gas state equation, that is:
P(t)Sd(t)＝nRT(t) (II)
the gas releases heat in the compression process, absorbs heat in the expansion process, and the external net heat flow is not large in the repeated compression-expansion process of the gas; the gas pulse frequency of the pulse extraction column is about 1Hz generally, the heat conduction process is a fast process relative to stainless steel, and the heat flow of the cylinder is mainly represented as internal circulation rather than external flow; the cylinder is made of stainless steel, so that the heat conducting property is poor, and the heat flow of the cylinder to the outside is further reduced by coating the heat insulating material on the outside of the cylinder; therefore, the compression-expansion process of the gas in the cylinder bore can be regarded as an adiabatic process.
In the case of piston motion, the piston will work on the gas in the cylinder, and the internal energy change Δ U equals Q + W, and Q equals 0 for adiabatic processes. And the piston performs work W ═ p (t) Δ t on the gas. According to the definition of k and C, there are
Substituting into the formula (II), and finishing to obtain the formula (I).
The axis direction of the cylinder is vertical, and the direction of the exhaust port is downward. The vertical direction is selected for the cylinder axis direction to avoid because of gravity influence, the frictional force is unbalanced between piston and the cylinder wall, and the wearing and tearing are unbalanced, and unilateral gas leakage. The vent is directed downward because the liquid droplets entrained by the gas path can gravitate to the bottom, reducing the radioactive contamination area.
The invention does not need to exhaust and supplement air under normal working conditions. However, when a large range of pulse pressures is required, the mass of gas in the cylinder needs to be changed, and then air charging or air discharging is required. In addition, after the cylinder works for a long time, a part of gas leaks through the dynamic seal, and the gas is also supplemented to the cylinder. According to the invention, the cylinder pressure detection point 8 and the cylinder temperature detection point 9 are arranged at the outlet of the cylinder, and the gas quality of the cylinder does not need to be detected additionally, because the gas quality in the cylinder can be calculated back according to the formula (I) by monitoring the working condition of the servo motor and the temperature and pressure of the gas.
In the whole gas pulse generation process, the cylinder and the gas loop do not exhaust outwards, so that the radioactive tail gas treatment capacity is reduced.
Since d (t) is calculated in the formula (I), only p (t) ≠ 0 is required, which is a condition naturally satisfied by the cylinder interior gas. Therefore, real-time adjustable and random continuous gas pulses can be generated according to the formula (I), and the invention has good operability.
The characteristic of the invention that any continuous gas pulse can be generated has positive significance for researching and developing a novel pulse extraction column. Because different types of gas pulses differ in operating intervals and energy efficiency for different types of pulsed extraction columns.
Example (b):
the embodiment is used for the gas pulse generation process of the pulse extraction column, and the specific operation steps are as follows: for the device of the invention, constructed as shown in fig. 1, the gas pulse gas supply object is a phi 50 glass pulse extraction column, and the actual pulse in the plate section of the glass pulse column is detected by using a blowing method.
And (3) constructing a displacement time function of the servo motor according to the formula (I) under the condition that the time function of the gas pressure in the cylinder is in a sine wave shape, so as to drive the servo motor. The actual pulse in the plate section is measured by pressure detection at the outlet of the piston cylinder and a blowing method of the pulse extraction column, which shows that the gas pulse is a sine pressure time function, and the amplitude and the frequency meet the target requirements.
In the whole operation process of the pulse column, the invention provides sine wave-shaped gas pulse of the pulse column, and meanwhile, the gas is not exhausted outwards.
Claims (4)
1. The utility model provides an air pulse generating device of nuclear pulse extraction post which characterized in that: the device comprises a servo motor (1), a cylinder (3) and a linear sliding table; an output shaft of the servo motor (1) is connected with a rotating shaft of the linear sliding table; a piston rod of the cylinder is connected with a sliding platform (2) of the linear sliding table; a four-way pipe (4) is arranged at the bottom of the cylinder and is respectively connected with a high-pressure air source, an emptying pipe and a pulse leg (10) through an air pipeline and an electromagnetic valve; an air cylinder pressure detection point (8) and an air cylinder temperature detection point (9) are arranged at an air cylinder outlet;
the operating parameters of the device at the occurrence of an air pulse satisfy the following relationship:
in the formula:
as a function of time of the rotation angle of the servomotor; p (t) is a servo motor power time function; p (t) is a function of in-cylinder pressure time, and T (t) is a function of in-cylinder temperature time; t is the running time; delta t is sampling time interval of a servo motor measurement and control system; k is a proportionality coefficient between the rotation angle of the servo motor and the displacement of the linear sliding table; n is the mass of the gas in the cylinder; r is an ideal gas constant; s is the cross-sectional area of the interior of the cylinder; and C is a rotation angle corresponding to the servo motor when the initial displacement of the linear sliding table is 0.
2. An air pulse generator for a pulse extraction column as defined in claim 1, wherein: the volume of the cylinder (1) is at least 10 times of the total volume of the pulse leg gas pipeline (7) and the pulse leg (10).
3. An air pulse generator for a pulse extraction column as defined in claim 1, wherein: the axis direction of the cylinder is vertical, and an exhaust port of the cylinder faces downwards.
4. An air pulse generating apparatus for a pulse extraction column according to claim 1, 2 or 3, wherein: and the outside of the cylinder is coated with a heat-insulating material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011016914.9A CN112354210A (en) | 2020-09-24 | 2020-09-24 | Air pulse generating device of nuclear pulse extraction column |
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| CN202011016914.9A CN112354210A (en) | 2020-09-24 | 2020-09-24 | Air pulse generating device of nuclear pulse extraction column |
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| CN202011016914.9A Pending CN112354210A (en) | 2020-09-24 | 2020-09-24 | Air pulse generating device of nuclear pulse extraction column |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3167395A (en) * | 1958-08-26 | 1965-01-26 | Union Carbide Corp | Resonating pulse reactor |
| CA2335084A1 (en) * | 1998-07-13 | 2000-01-20 | Leica Microsystems Inc. | Non-contact tonometer having non-linear pressure increase |
| CN201253502Y (en) * | 2008-05-21 | 2009-06-10 | 大连理工大学 | Pulse extraction device of one-device two-tower structure |
| WO2011090825A1 (en) * | 2010-01-19 | 2011-07-28 | Mks Instruments, Inc. | Control for and method of pulsed gas delivery |
| CN102489035A (en) * | 2011-11-11 | 2012-06-13 | 清华大学 | Pulse extraction tower employing diaphragm metering pump as mechanical pulse generator and method thereof |
| CN202342942U (en) * | 2011-11-11 | 2012-07-25 | 清华大学 | Pulsed extraction column with diaphragm metering pump as mechanical pulse generator |
| CN202620774U (en) * | 2012-04-11 | 2012-12-26 | 清华大学 | Gas or mechanical pulse extraction column system |
| CN203264340U (en) * | 2013-05-16 | 2013-11-06 | 南京化工职业技术学院 | Pulse generation device of pulse extraction tower |
| CN104564608A (en) * | 2014-12-30 | 2015-04-29 | 广西科技大学 | Double-acting pulse airflow generation device |
-
2020
- 2020-09-24 CN CN202011016914.9A patent/CN112354210A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3167395A (en) * | 1958-08-26 | 1965-01-26 | Union Carbide Corp | Resonating pulse reactor |
| CA2335084A1 (en) * | 1998-07-13 | 2000-01-20 | Leica Microsystems Inc. | Non-contact tonometer having non-linear pressure increase |
| CN201253502Y (en) * | 2008-05-21 | 2009-06-10 | 大连理工大学 | Pulse extraction device of one-device two-tower structure |
| WO2011090825A1 (en) * | 2010-01-19 | 2011-07-28 | Mks Instruments, Inc. | Control for and method of pulsed gas delivery |
| CN102489035A (en) * | 2011-11-11 | 2012-06-13 | 清华大学 | Pulse extraction tower employing diaphragm metering pump as mechanical pulse generator and method thereof |
| CN202342942U (en) * | 2011-11-11 | 2012-07-25 | 清华大学 | Pulsed extraction column with diaphragm metering pump as mechanical pulse generator |
| CN202620774U (en) * | 2012-04-11 | 2012-12-26 | 清华大学 | Gas or mechanical pulse extraction column system |
| CN203264340U (en) * | 2013-05-16 | 2013-11-06 | 南京化工职业技术学院 | Pulse generation device of pulse extraction tower |
| CN104564608A (en) * | 2014-12-30 | 2015-04-29 | 广西科技大学 | Double-acting pulse airflow generation device |
Non-Patent Citations (1)
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| 无: "《脉冲筛板萃取柱研究的新进展（译文集）》", 31 March 1985, 原子能出版社 * |
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Application publication date: 20210212 |