CN102494970B - Method and device for testing liquid surface forced evaporation mass transfer coefficients - Google Patents

Method and device for testing liquid surface forced evaporation mass transfer coefficients Download PDF

Info

Publication number
CN102494970B
CN102494970B CN 201110350998 CN201110350998A CN102494970B CN 102494970 B CN102494970 B CN 102494970B CN 201110350998 CN201110350998 CN 201110350998 CN 201110350998 A CN201110350998 A CN 201110350998A CN 102494970 B CN102494970 B CN 102494970B
Authority
CN
China
Prior art keywords
mass transfer
air
evaporation
cavity
liquid level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201110350998
Other languages
Chinese (zh)
Other versions
CN102494970A (en
Inventor
高蓬辉
周国庆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Original Assignee
China University of Mining and Technology CUMT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN 201110350998 priority Critical patent/CN102494970B/en
Publication of CN102494970A publication Critical patent/CN102494970A/en
Application granted granted Critical
Publication of CN102494970B publication Critical patent/CN102494970B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention relates to a method and a device for testing liquid surface forced evaporation mass transfer coefficients; along with popularization and application of a liquid surface forced evaporation technology in industries, liquid surface mass transfer coefficients under different conditions need to be grasped; in an evaporation process, the mass transfer coefficient measuring device is put in a measured liquid surface under a steady working condition; and the liquid surface forced evaporation mass transfer coefficients under different airflows and temperatures can be conveniently obtained by measuring an airflow flow velocity, airflow inlet humidity, airflow outlet humidity, water quality recycled after being adsorbed and dehumidified, and liquid surface forced evaporation surface mass transfer coefficients. Accurate data required by design and production can be provided for the fields of chemical industry, petroleum and sea water desalination. The device disclosed by the invention is simple in structure, convenient for operation and high in precision and accuracy.

Description

A kind of liquid level forced evaporation mass transfer coefficient method of testing and device
Technical field
The present invention relates to a kind of liquid level forced evaporation mass transfer coefficient method of testing and device, mass transfer coefficient determines when being particularly useful for liquid level forced evaporation in chemical industry, oil, the desalinization field.
Background technology
In production fields such as oil, chemical industry and desalinization, there is the operating condition of forced evaporation, because the needs of design and production carry out accurate Calculation to liquid surface evaporation mass transfer.From present commercial production, mainly measuring the air-flow moisture by the exit for the calculating of liquid surface forced evaporation estimates, precision and accuracy are all relatively poor, in order to improve this present situation, press for the mass transfer coefficient that new measuring method and measurement mechanism obtain liquid surface under the forced evaporation condition.
Summary of the invention
Technical matters: the objective of the invention is the mass transfer problem at liquid surface under the forced evaporation condition, a kind of method is easy, simple in structure, accuracy is higher liquid level forced evaporation mass transfer coefficient method of testing and device are provided.
Technical scheme: liquid level forced evaporation mass transfer coefficient method of testing of the present invention, under liquid level forced evaporation steady state (SS), to evaporate mass transfer measurement cavity and float on the evaporating liquid surface, the air inlet middle part of measuring cavity at the evaporation mass transfer arranges first humiture and air flow rate sensor, in the adiabatic pipeline that the air outlet that evaporates mass transfer measurement cavity is connected with adsorption moisture eliminator second humiture and air flow rate sensor is set; By first humiture and air flow rate sensor and second humiture and air flow rate sensor water capacity, temperature, the volumetric flow rate of air-flow at place, the gentle outflow of test airflow air inlet air port respectively And current density
Figure 432003DEST_PATH_IMAGE004
, when the water capacity of air-flow air outlet is in state of saturation, determine the current density of evaporating liquid surface air-flow by water vapour table in the Engineering Thermodynamics
Figure 246376DEST_PATH_IMAGE004
Value;
According to mass transfer coefficient
Figure 2011103509984100002DEST_PATH_IMAGE006
Formula:
Figure DEST_PATH_IMAGE008
Obtain the mass transfer coefficient on liquid level surface,
Wherein:
Figure DEST_PATH_IMAGE010
Be inlet air flow water capacity (kg/kg dry air), Be exit flow water capacity (kg/kg dry air), Be nearly liquid level place water capacity (kg/kg dry air), LBe the length of evaporation mass transfer measurement cavity, BMeasure the width of cavity for the evaporation mass transfer.
Realize the liquid level forced evaporation mass transfer coefficient measurement mechanism of said method, comprise the evaporation mass transfer measurement cavity that is located on the liquid level, the biside plate bottom, front and back that the evaporation mass transfer is measured cavity is connected with and makes the evaporation mass transfer measure cavity to swim in double-vane on the liquid level, the left end air inlet middle part that the evaporation mass transfer is measured cavity is provided with first humiture and air flow rate sensor, the right-hand member that the evaporation mass transfer is measured cavity is provided with deep bead, the middle part of deep bead is provided with air stream outlet, air stream outlet menopause pipe line is connected with adsorption moisture eliminator, is provided with second humiture and air flow rate sensor in the adiabatic pipeline.
The length L that described evaporation mass transfer is measured cavity is 40～80cm, and width B is 20～40cm, and high H is 20～40cm; Described evaporation mass transfer is measured cavity and is made with stainless steel substrates.
Beneficial effect: owing to adopted technique scheme, by measuring liquid level forced evaporation surface mass transfer coefficient, can obtain liquid surface forced evaporation mass transfer coefficient under different airsheds and the temperature easily, design and produce required accurate data accurately for chemical industry, oil and desalinization field provide.It is simple in structure, easy to operate, precision and accuracy height.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is that the A of Fig. 1 is to view.
Among the figure: 1-evaporation mass transfer is measured cavity, 2-adsorption moisture eliminator, 3-moisture returnable, 4-air inlet, 5-first humiture and air flow rate sensor, 6-air stream outlet, 7-second humiture and air flow rate sensor, the adiabatic pipeline of 8-.
Embodiment
Below in conjunction with in the accompanying drawing concrete enforcement of the present invention being further elaborated:
Liquid level forced evaporation mass transfer coefficient method of testing of the present invention, under liquid level forced evaporation steady state (SS), virtual condition according to liquid level to be measured, to evaporate mass transfer measurement cavity 1 and float on the evaporating liquid surface, and guarantee that air stream outlet 6 is on liquid level, air inlet 4 middle parts of measuring cavity 1 at the evaporation mass transfer arrange first humiture and air flow rate sensor 5, in air outlet 6 that the evaporation mass transfer is measured cavity 1 and adiabatic pipeline 8 that adsorption moisture eliminator 2 is connected second humiture and air flow rate sensor 7 are set; Under the effect of liquid surface air-flow forced evaporation, by being fixed on second humiture and the air flow rate sensor 7 on first humiture and air flow rate sensor 5 and adiabatic pipeline 8 on the airflow inlet face 4, the volumetric flow rate of the water capacity at 6 places, test airflow air inlet 4 gentle outflow air ports, temperature, air-flow respectively
Figure 101461DEST_PATH_IMAGE002
And current density
Figure 961970DEST_PATH_IMAGE004
, when the water capacity of air-flow air outlet 6 is in state of saturation, according to the temperature and pressure of measuring evaporation liquid level top air-flow under the service condition, determine the current density of evaporating liquid surface air-flow by water vapour table in the Engineering Thermodynamics
Figure 160870DEST_PATH_IMAGE004
Value;
According to mass transfer coefficient
Figure 298590DEST_PATH_IMAGE006
Formula:
Figure 885430DEST_PATH_IMAGE008
Obtain the mass transfer coefficient on liquid level surface,
Wherein: Be inlet air flow water capacity (kg/kg dry air),
Figure 845612DEST_PATH_IMAGE012
Be exit flow water capacity (kg/kg dry air),
Figure 962473DEST_PATH_IMAGE014
Be nearly liquid level place water capacity (kg/kg dry air), LBe the length of evaporation mass transfer measurement cavity 1, BMeasure the width of cavity 1 for the evaporation mass transfer.
For example: in the desalting process of a forced evaporation, the width of measurement mechanism
Figure DEST_PATH_IMAGE016
M, length
Figure DEST_PATH_IMAGE018
M, the volumetric flow rate of air-flow is
Figure DEST_PATH_IMAGE020
0.5m 3/ s, the liquid evaporating temperature is 0 ℃, at this moment atmospheric density
Figure DEST_PATH_IMAGE022
Kg/m 3, the relative humidity of airflow inlet is respectively 10%, the nearly wall of exit flow water capacity and liquid level place water capacity near the time, by following formula calculate this moment mass transfer coefficient
Figure DEST_PATH_IMAGE024
4.31g/ (m 2* s).
Liquid level forced evaporation mass transfer coefficient measurement mechanism of the present invention, mainly measure cavity 1 by the evaporation mass transfer, adsorption moisture eliminator 2, moisture returnable 3, first humiture and air flow rate sensor 5, second humiture and air flow rate sensor 7 and adiabatic pipeline 8 are formed, the evaporation mass transfer is measured cavity 1 and is connected with adsorption moisture eliminator 2 by adiabatic pipeline 8, but obtain the also mass transfer coefficient on liquid level surface under the inverse test condition of water in the moisture returnable 3, first humiture and air flow rate sensor 5 are fixed on the middle part of air-flow air inlet 4 by a thin bar, the air-flow air inlet arranges for open, the air stream outlet 6 menopause pipe lines 8 of air-flow by opposite side are delivered to adsorption moisture eliminator 2, the second humitures and air flow rate sensor 7 is fixed in the adiabatic pipeline 8.The evaporation mass transfer is measured cavity 1 and is located on the liquid level, and the length L that the evaporation mass transfer is measured cavity 1 is 40～80cm, and width B is 20～40cm, and high H is 20～40cm; The evaporation mass transfer is measured cavity 1 usefulness stainless steel substrates and is made.The biside plate bottom, front and back that the evaporation mass transfer is measured cavity 1 is connected with and makes the evaporation mass transfer measure cavity 1 to swim in double-vane on the liquid level, the left end air inlet middle part that the evaporation mass transfer is measured cavity 1 is provided with first humiture and air flow rate sensor 5, the right-hand member that the evaporation mass transfer is measured cavity 1 is provided with deep bead, the middle part of deep bead is provided with air stream outlet 6, air stream outlet 6 menopause pipe lines 8 are connected with adsorption moisture eliminator 2, are provided with second humiture and air flow rate sensor 7 in the adiabatic pipeline 8.Measuring cavity 1 from the evaporation mass transfer arranges according to the actual measurement condition to the distance of adsorption moisture eliminator 2.

Claims (4)

1. liquid level forced evaporation mass transfer coefficient method of testing, it is characterized in that: under liquid level forced evaporation steady state (SS), to evaporate mass transfer measurement cavity (1) and float on the evaporating liquid surface, air-flow air inlet (4) middle part of measuring cavity (1) at the evaporation mass transfer arranges first humiture and air flow rate sensor (5), in air-flow air outlet (6) that the evaporation mass transfer is measured cavity (1) and adiabatic pipeline (8) that adsorption moisture eliminator (2) is connected second humiture and air flow rate sensor (7) is set; By first humiture and air flow rate sensor (5) and second humiture and air flow rate sensor (7) the volumetric flow rate V of test airflow air inlet (4) gentle outflow air port (6) water capacity of locating, temperature, air-flow respectively aWith current density ρ a
According to mass transfer coefficient h MdFormula:
h md = V a × ρ a × ( f L - f 0 ) ( f w - 0.5 f L - 0.5 f 0 ) × B × L Obtain the mass transfer coefficient on liquid level surface,
Wherein: f 0Be inlet air flow water capacity (kg/kg dry air), f LBe exit flow water capacity (kg/kg dry air), f wBe nearly liquid level place water capacity (kg/kg dry air), L is the length of evaporation mass transfer measurement cavity (1), and B measures the width of cavity (1) for the evaporation mass transfer.
2. liquid level forced evaporation mass transfer coefficient measurement mechanism, it is characterized in that: it comprises the evaporation mass transfer measurement cavity (1) that is located on the liquid level, the biside plate bottom, front and back that the evaporation mass transfer is measured cavity (1) is connected with and makes the evaporation mass transfer measure cavity (1) to swim in double-vane on the liquid level, left end air-flow air inlet (4) middle part that the evaporation mass transfer is measured cavity (1) is provided with first humiture and air flow rate sensor (5), the right-hand member that the evaporation mass transfer is measured cavity (1) is provided with deep bead, the middle part of deep bead is provided with air-flow air outlet (6), air-flow air outlet (6) menopause pipe line (8) is connected with adsorption moisture eliminator (2), is provided with second humiture and air flow rate sensor (7) in the adiabatic pipeline (8).
3. liquid level forced evaporation mass transfer coefficient measurement mechanism according to claim 2 is characterized in that: the length L that described evaporation mass transfer is measured cavity (1) is 40～80cm, and width B is 20～40cm, and high H is 20～40cm.
4. liquid level forced evaporation mass transfer coefficient measurement mechanism according to claim 2 is characterized in that: described evaporation mass transfer is measured cavity (1) and is made with stainless steel substrates.
CN 201110350998 2011-11-09 2011-11-09 Method and device for testing liquid surface forced evaporation mass transfer coefficients Expired - Fee Related CN102494970B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201110350998 CN102494970B (en) 2011-11-09 2011-11-09 Method and device for testing liquid surface forced evaporation mass transfer coefficients

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201110350998 CN102494970B (en) 2011-11-09 2011-11-09 Method and device for testing liquid surface forced evaporation mass transfer coefficients

Publications (2)

Publication Number Publication Date
CN102494970A CN102494970A (en) 2012-06-13
CN102494970B true CN102494970B (en) 2013-08-21

Family

ID=46186812

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201110350998 Expired - Fee Related CN102494970B (en) 2011-11-09 2011-11-09 Method and device for testing liquid surface forced evaporation mass transfer coefficients

Country Status (1)

Country Link
CN (1) CN102494970B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105372413B (en) * 2015-10-29 2016-09-14 广东电网有限责任公司电力科学研究院 Resin overall mass transfer coefficient measuring method and system
CN105929111B (en) * 2016-04-18 2018-01-16 东南大学 A kind of equivalent mass tranfer coefficient measurement of instability method of vapor in communicating pipe
CN114354843B (en) * 2021-11-24 2023-11-17 华东理工大学 Method for conveniently measuring gas-liquid total mass transfer coefficient of microreactor based on chemical system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU605157A2 (en) * 1976-02-17 1978-04-30 Одесский технологический институт пищевой промышленности им.М.В.Ломоносова Laboratory installation for determining heat-mass transfer coefficient
SU673902A1 (en) * 1978-02-24 1979-07-15 Одесский Технологический Институт Пищевой Промышленности Им.М.В. Ломоносова Mass transfer coefficient determining apparatus
SU721725A1 (en) * 1978-10-10 1980-03-15 Одесский технологический институт пищевой промышленности им.М.В.Ломоносова Device for determining heat transfer coefficients
SU1120230A1 (en) * 1982-12-24 1984-10-23 Одесский технологический институт пищевой промышленности им.М.В.Ломоносова Method of determining coefficients of heat and mass transfer of pulverulent materials in drying and device for effecting same
CN2098684U (en) * 1991-05-16 1992-03-11 华南理工大学 Gas-liquid phase mass tranfer coefficient tester
CN1510411A (en) * 2002-12-26 2004-07-07 北京化工大学 Method for measuring microcellular plate-type membrane porosity
JP2006084240A (en) * 2004-09-14 2006-03-30 Ogawa Kankyo Kenkyusho:Kk Wastewater treatment measuring method
CN101735950A (en) * 2008-11-27 2010-06-16 北京有色金属研究总院 Bacterial agitation leaching experimental facility and method for measuring oxygen mass transfer coefficients

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU605157A2 (en) * 1976-02-17 1978-04-30 Одесский технологический институт пищевой промышленности им.М.В.Ломоносова Laboratory installation for determining heat-mass transfer coefficient
SU673902A1 (en) * 1978-02-24 1979-07-15 Одесский Технологический Институт Пищевой Промышленности Им.М.В. Ломоносова Mass transfer coefficient determining apparatus
SU721725A1 (en) * 1978-10-10 1980-03-15 Одесский технологический институт пищевой промышленности им.М.В.Ломоносова Device for determining heat transfer coefficients
SU1120230A1 (en) * 1982-12-24 1984-10-23 Одесский технологический институт пищевой промышленности им.М.В.Ломоносова Method of determining coefficients of heat and mass transfer of pulverulent materials in drying and device for effecting same
CN2098684U (en) * 1991-05-16 1992-03-11 华南理工大学 Gas-liquid phase mass tranfer coefficient tester
CN1510411A (en) * 2002-12-26 2004-07-07 北京化工大学 Method for measuring microcellular plate-type membrane porosity
JP2006084240A (en) * 2004-09-14 2006-03-30 Ogawa Kankyo Kenkyusho:Kk Wastewater treatment measuring method
CN101735950A (en) * 2008-11-27 2010-06-16 北京有色金属研究总院 Bacterial agitation leaching experimental facility and method for measuring oxygen mass transfer coefficients

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
Conrad R. Iskra et al..Convective mass transfer coefficient for a hydrodynamically developed airflow in a short rectangular duct.《International Journal of Heat and Mass Transfer》.2006,第50卷2376-2393.
Convective mass transfer coefficient for a hydrodynamically developed airflow in a short rectangular duct;Conrad R. Iskra et al.;《International Journal of Heat and Mass Transfer》;20061218;第50卷;2376-2393 *
Evaluation of the different definitions of the convective mass transfer coefficient for water evaporation into air;H.-J. Steeman et al.;《International Journal of Heat and Mass Transfer》;20090406;第52卷;3757-3766 *
H.-J. Steeman et al..Evaluation of the different definitions of the convective mass transfer coefficient for water evaporation into air.《International Journal of Heat and Mass Transfer》.2009,第52卷3757-3766.
蜂窝型加湿器流体动力学模拟及传热传质分析;高蓬辉 等;《石油化工设备》;20071130;第36卷(第6期);5-9 *
高蓬辉 等.蜂窝型加湿器流体动力学模拟及传热传质分析.《石油化工设备》.2007,第36卷(第6期),5-9.

Also Published As

Publication number Publication date
CN102494970A (en) 2012-06-13

Similar Documents

Publication Publication Date Title
CN102494970B (en) Method and device for testing liquid surface forced evaporation mass transfer coefficients
CN201126376Y (en) Detecting device for gas flow apparatus
US6843106B2 (en) Differential permeometer
CN201607418U (en) Low frost-point humidity standard generation device
CN107014240B (en) A kind of cooling tower cooling efficiency monitoring method and system
CN206410842U (en) The force balance of tiny area windage resistance in a kind of measurement Boundary Layer on Flat Plate
CN104236816B (en) A kind of leakage detecting instrument on-line calibration device and method
Zakeri et al. Experimental investigation of pressure drop, liquid hold-up and mass transfer parameters in a 0.5 m diameter absorber column
CN104502161A (en) Calibration equipment of dust sampler
CN105547957B (en) Soil bacterial diversity wetted front suction and rainfall spurt volume computational methods
CN202501910U (en) Calibrating device for heavy caliber gas flow
CN203572739U (en) Test device for measuring surface tension of liquid by utilizing maximum bubble method
CN105784926B (en) High wet gas current water capacity measurement apparatus and method
CN105319145B (en) A kind of method for continuous measuring of high speed medium temperature negative pressure air humidity
CN103335927A (en) Grain porosity measurement apparatus and measurement method thereof
CN103940581B (en) A kind of experimental technique of monitoring trace gas concentration value measurement jet entrainment amount
CN205103165U (en) Device that combines vortex correlation systematic observation ozone flux
CN103278344B (en) Device for measuring comprehensive oxygentransfer performance of aerator in technical state
CN104237307A (en) Method and device for measuring saturated steam dryness through steam ejecting and extraction
CN202583025U (en) Double-elbow-pipe steam dryness on-line measurement meter
CN203132656U (en) Device for calibrating steam flowmeter by using condensation weighing method
CN206676200U (en) Source of the gas humidity freeze-day with constant temperature system
CN105126629A (en) Testing method and testing device for through porosity of hollow fiber membrane
CN204346779U (en) A kind of dust sampler calibrating installation
CN203981219U (en) Wing serial sampling air flow sensor for variable air volume system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130821

Termination date: 20171109

CF01 Termination of patent right due to non-payment of annual fee