CN101187619B - Flue fog drip test method - Google Patents

Flue fog drip test method Download PDF

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Publication number
CN101187619B
CN101187619B CN2007100927582A CN200710092758A CN101187619B CN 101187619 B CN101187619 B CN 101187619B CN 2007100927582 A CN2007100927582 A CN 2007100927582A CN 200710092758 A CN200710092758 A CN 200710092758A CN 101187619 B CN101187619 B CN 101187619B
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droplet
pipe
flue gas
sampling
droplets
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CN101187619A (en
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洪燕
杜云贵
刘清才
黄锐
尹正明
李锋
隋建才
余宇
杨剑
王方群
赵培超
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Chongqing University
CPI Yuanda Environmental Protection Engineering Co Ltd
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Chongqing University
CPI Yuanda Environmental Protection Engineering Co Ltd
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Abstract

The invention discloses a method for testing droplets in smoke, which comprises following steps: firstly, setting a droplets sampling system, secondly, testing and calculating smoke flowing speed through an L-shape Pitot tube (11), thirdly, adjusting airflow controlling valve (9a) which is on a vacuum pump of the droplets sampling system according to the tested smoke flowing speed. Droplets concentrations can be calculated according to the quality of the droplets which are collected by a droplets collecting device. The invention adopts a method of constant velocity aspirating smoke, the droplets in the smoke are collected by the droplets collecting device, droplet quality can be obtained through weighing the weight of the droplets collecting device before and after collecting, and furthermore the droplets concentrations can be obtained through formulas. Compared with a traditional method, the method needs no precise equipment tests as atomic absorption spectrometry, thereby testing data is minimized, the operation is easier, and testing results are more accurate.

Description

The method of testing of droplet in the flue gas
Technical field
The invention belongs to a kind of method of testing of desulfuration field, specifically, is the method for testing of droplet in a kind of desulfurization flue gas.
Background technology
Wet desulphurization absorption tower is in operational process, and easily producing particle diameter is " mist " of 10-60 micron, should " mist " not only contain moisture, also is dissolved with sulfuric acid, sulfate, SO 2Deng, if do not properly settle, enter " mist " of chimney, will be simultaneously SO 2Take in the atmosphere, cause blower fan, heat exchanger and flue fouling and corrosion.Therefore, wet desulphurization has proposed the demist requirement to the absorption tower on technology, and flue gas after being purified will be carried out demist and be handled before leaving the absorption tower.Mist eliminator is the major equipment that carries out the flue gas demist, and it removes the continuous reliability service that fog effect can directly influence each system of FGD.
The principle of work of mist eliminator is: the flue gas after the desulfurization is with the bending channel of certain velocity flow through mist eliminator, flue gas is changed direction of motion rapidly, continuously, because of centrifugal force and action of inertia, droplet in the flue gas strikes on the mist eliminator blade and is captured down, droplet compiles the formation current, in action of gravity falls to the slurries pond, realize gas-liquid separation, thereby reach except that fog effect.
Droplet concentration is to investigate the important indicator that mist eliminator removes fog effect, under normal operating condition, and mist eliminator
Droplet concentration requirement in the outlet flue gas is lower than 75mg/Nm 3
At present, what the method for test droplet concentration mainly adopted on the engineering is the magnesium ion trace method: with the sampling of smoke dust sampling instrument, the droplet in the flue gas is condensate in the tank body by drainer earlier, and drainer is washed with distilled water, the Mg in the constant volume post analysis droplet in the sampling back 2+Concentration; Analyze the Mg in the slurries filtrate simultaneously 2+Concentration is at last according to two Mg 2+Concentration value calculates droplet concentration.The subject matter that this method exists is exactly that error is big, because the magnesium ion content in slurries and the flue gas droplet is all very low, experimental error is very big, and need analyze by the precision equipment of atomic absorption spectrum and so on.
Summary of the invention
It is a kind of simple to operate that problem to be solved by this invention is to provide, the accurate droplet method of testing of measurement result.
Technical scheme of the present invention is as follows: the method for testing of droplet in a kind of flue gas, its key are to carry out as follows:
Step 1, the droplet sampling system is set, sampling system comprises the droplet gathering-device, sampling pipe, described droplet gathering-device is cylindrical, by last pipe, the middle part pipe, following pipe connects to form, be provided with in the connection in the middle of the pipe closed at both ends of described middle part, the condenser pipe of following pipe, this pipe upper end, middle part is covered with cylindrical filter paper, describedly go up the upper end closed of cylinder and be extended with the flue gas efferent duct, the described sealing of cylinder lower end down, sidewall is extended with suction nozzle, and described droplet gathering-device is fixed on the sampling pipe outer wall, adopt flexible pipe to be connected between described flue gas efferent duct and the sampling pipe lower end mouth of pipe, connect wet gas meter on the sampling pipe successively, vacuum pump;
Step 2 is measured and is calculated flue gas flow rate, opens the baffle plate of thieff hatch, inserts " L " type pitot tube, and the pitot tube sampling pipe mouth of pipe that keeps pitot tube is towards identical with the flow of flue gas direction (mouth of pipe is back to flue gas flow direction); The pitot tube sampling pipe is advanced to sampled point, and rotation pitot tube sampling pipe makes the pitot tube sampling pipe mouth of pipe towards opposite with the flow of flue gas direction (mouth of pipe is over against flue gas flow direction); The air guide rubber tube is connected differential pressure indicator, and record differential pressure indicator reading is designated as Pd; After measurement finishes, extract pitot tube, cover the baffle plate of thieff hatch; Computing formula with flue gas flow rate v (m/s): v=c * (2g Pd/ γ) 1/2
Wherein: c-coefficient of Pitot tube L type c=1.00
G-acceleration of gravity, 9.8m/s 2
The dynamic pressure of Pd-flue gas, mmH 2O
The density of γ-unit volume gas, kg/m 3, between 1.28-1.30.
Calculate flue gas flow rate v;
Step 3, the measurement of droplet concentration, the droplet gathering-device with the droplet sampling system takes off weighing earlier, then the droplet gathering-device is loaded onto; Open the thieff hatch baffle plate, slowly insert the droplet sampling apparatus to sampled point, suction nozzle is fixed on sampling pipe on the short tube mouth with geometrical clamp towards identical with flue gas flow direction (suction nozzle is back to flue gas flow direction); Open vacuum pump,, screw barometric damper, turn off vacuum pump the wet gas meter zeroing; The rotation sampling pipe by suction nozzle towards opposite with flue gas flow direction (suction nozzle is over against flue gas flow direction); Open vacuum pump, regulate control damper to gas meter indication flow velocity and equate that with the flue gas flow rate v that aforementioned calculation goes out simultaneous temperature meter reading is designated as t; Constant speed is after air-breathing a period of time, and the rotation sampling pipe towards opposite with flue gas flow direction (revolving suction nozzle back to flue gas flow direction), and writes down volume reading on the wet gas meter by suction nozzle, is designated as V; Pressure reading is designated as Pm, slowly takes out the droplet sampling system then, covers baffle plate; Take off the droplet gathering-device, bring back the laboratory and weigh, subtract each other with the initial weight of droplet gathering-device and promptly get droplet weight, be designated as m; Saturated vapor pressure Pv in the time of t ℃ can get by tabling look-up; Computing formula according to droplet concentration:
C＝m×1000/{[(Pa+Pm-Pv)×273.15×V]/[(273.15+t)×760]}
Wherein: the concentration of C-droplet, mg/Nm 3
The weight of m-droplet, mg
V-sucks the cumulative volume of flue gas, L
T-wet gas meter thermometer temperature, ℃
The Pa-atmospheric pressure, mmHg
Pm-wet gas meter pressure, mmHg
Saturated vapor pressure in the time of Pv-t ℃, mmHg
Calculate droplet concentration in the flue gas.
Described flexible pipe is a silicone tube; Described condenser pipe is shape in the shape of a spiral.The air-breathing time of the described droplet sampling system of measurement result sampled point constant speed in flue should be greater than 60min more accurately in order to obtain.
Beneficial effect: the present invention adopts the method for constant speed suction flue gas, and it is collected that the droplet in the flue gas is collected device, the weight before and after weighing droplet gathering-device is collected get final product the droplet quality, and then obtain droplet concentration by formula.This method is compared the precision equipment that does not need atomic absorption spectrum and so on and is measured with classic method, also do not need to measure so much data, operates simplyr, and the result of measurement is more accurate.
Description of drawings
Fig. 1 is the structural representation of droplet sampling system of the present invention;
Fig. 2 is the structural representation of the present invention " L " type pitot tube;
Fig. 3 is that droplet sampling system of the present invention stretches into flue thieff hatch working state schematic representation;
Fig. 4 is that the present invention " L " type pitot tube stretches into flue thieff hatch working state schematic representation.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
See also the method for testing of droplet in Fig. 1, Fig. 2, Fig. 3, Fig. 4 flue gas, carry out as follows:
Step 1, the droplet sampling system is set, the droplet sampling system comprises droplet gathering-device 1, sampling pipe 2, described droplet gathering-device 1 is cylindrical, by last pipe 5, middle part pipe 4, following pipe 3 connects to form, be provided with in the connection in the middle of pipe 4 closed at both ends of described middle part, following pipe 5,3 spiral condenser pipe 4a, these middle part pipe 4 upper ends are covered with cylindrical filter paper 7, describedly go up the upper end closed of cylinder 5 and be extended with flue gas efferent duct 5a, the described sealing of cylinder 3 lower ends down, sidewall is extended with suction nozzle 3a, described droplet gathering-device is fixed on sampling pipe 2 outer walls, adopt silicone tube 8 to be connected between described flue gas efferent duct 5a and the sampling pipe 2 lower end mouths of pipe, sampling pipe 2 upper ends connect vacuum pump 9 successively, wet gas meter 10;
Step 2 is measured and is calculated flue gas flow rate, opens the baffle plate of thieff hatch 6, inserts " L " type pitot tube 11, and the pitot tube sampling pipe 11a mouth of pipe that keeps " L " type pitot tube 11 is towards identical with the flow of flue gas direction; 11a is advanced to sampled point with the pitot tube sampling pipe, and rotation " L " type pitot tube 11 makes the pitot tube sampling pipe 11a mouth of pipe towards opposite with the flow of flue gas direction; 11a connects differential pressure indicator with the pitot tube sampling pipe, and the differential pressure indicator reading is 230pa, is 23.47mmH 2O;
After measurement finishes, extract " L " type pitot tube 11, cover the baffle plate of thieff hatch 6; The computing formula of flue gas flow rate v (m/s): v=c * (2g Pd/ γ) 1/2
Wherein: the c-coefficient of Pitot tube
L type c=1.00
Pd＝23.47mmH 2O
G-acceleration of gravity, 9.8m/s 2
The dynamic pressure of Pd-flue gas, mmH 2O
The density of γ-unit volume gas, kg/m 3, be 1.30;
The result of calculation of flue gas flow rate v (m/s):
v＝c×(2g?Pd/γ) 1/2
＝1×(2×9.8×23.47/1.30) 1/2
＝18.81m/s
Step 3, the measurement of droplet concentration, earlier with in the droplet sampling system droplet gathering-device 1 take off weighing, then droplet gathering-device 1 is loaded onto; Open thieff hatch 6 baffle plates, slowly insert the droplet sampling system, with suction nozzle 3a back to flue gas flow direction to sampled point, with geometrical clamp sampling pipe 2 is fixed on the short tube mouth; Open vacuum pump 9,, screw barometric damper 9a, turn off vacuum pump 9 wet gas meter 10 zeroings; Rotation sampling pipe 2 allows suction nozzle 3a over against flue gas flow direction; Open vacuum pump 9, regulate control damper 9a and equate 22.6 ℃ of recording thermometer readings with the flue gas flow rate 18.81m/s that aforementioned calculation goes out to gas meter indication flow velocity; Behind the air-breathing 60min of constant speed, rotation sampling pipe 2 allows suction nozzle 3a back to flue gas flow direction, and notes the volume reading 475L on the wet gas meter 10; Pressure 0.1KPa slowly takes out the droplet sampling system then, covers baffle plate; Take off droplet gathering-device 1, bring back the laboratory and weigh, subtract each other 26mg with the initial weight of droplet gathering-device 1; Atmospheric pressure Pa is 746.17mmHg; 22.6 ℃ saturated vapor pressure Pv be 20.685mmHg by tabling look-up; Computing formula according to droplet concentration:
C＝m×1000/{[(Pa+Pm-Pv)×273.15×V]/[(273.15+t)×760]}
Wherein: the concentration of C-droplet, mg/Nm3
The weight of m-droplet, mg
V-sucks the cumulative volume of flue gas, L
T-wet gas meter thermometer temperature, ℃
The Pa-atmospheric pressure, mmHg
Pm-wet gas meter pressure, mmHg
Saturated vapor pressure in the time of Pv-t ℃, mmHg
Droplet concentration=m * 1000/[(Pa+Pm-Pv) * 273.15 * V/ (273.15+t) * 760]
＝26×1000/[(746.17+0.75-20.685)×475×273.15/(273.15+22.6)×760]
＝62.03mg/Nm 3

Claims (3)

1. the method for testing of droplet in the flue gas is characterized in that carrying out as follows:
Step 1, the droplet sampling system is set, this droplet sampling system comprises droplet gathering-device (1), sampling pipe (2), described droplet gathering-device (1) is cylindrical, by last pipe (5), middle part pipe (4), following pipe (3) connects to form, described middle part pipe (4) closed at both ends, the centre is provided with in the connection, following pipe (5,3) condenser pipe (4a), this middle part pipe (4) upper end is covered with filter paper (7), describedly go up the upper end closed of cylinder (5) and be extended with flue gas efferent duct (5a), the described sealing of cylinder (3) lower end down, sidewall is extended with suction nozzle (3a), described droplet gathering-device is fixed on sampling pipe (2) outer wall, adopts flexible pipe (8) to be connected between described flue gas efferent duct (5a) and sampling pipe (2) the lower end mouth of pipe, and sampling pipe (2) upper end connects vacuum pump (9) successively, wet gas meter (10);
Step 2 is measured and is calculated flue gas flow rate, opens the baffle plate of flue thieff hatch (6), inserts " L " type pitot tube (11), and pitot tube sampling pipe (11a) mouth of pipe that keeps " L " type pitot tube (11) is towards identical with the flow of flue gas direction; (11a) is advanced to sampled point with the pitot tube sampling pipe, and rotation " L " type pitot tube (11) makes pitot tube sampling pipe (11a) mouth of pipe towards opposite with the flow of flue gas direction; (11a) connects differential pressure indicator with the pitot tube sampling pipe, and record differential pressure indicator reading is designated as Pd; After measurement finishes, extract " L " type pitot tube (11), cover the baffle plate of thieff hatch (6); Computing formula with flue gas flow rate v (m/s): v=c * (2g Pd/ γ) 1/2
Wherein: c-coefficient of Pitot tube L type c=1.00
G-acceleration of gravity, 9.8m/s 2
The dynamic pressure of Pd-flue gas, mmH 2O
The density of γ-unit volume gas, kg/m 3, between 1.28-1.30,
Calculate flue gas flow rate v;
Step 3, the measurement of droplet concentration is taken off weighing with the droplet gathering-device (1) in the droplet sampling system earlier, then droplet gathering-device (1) is loaded onto; Open thieff hatch (6) baffle plate, slowly insert the droplet sampling system to sampled point, suction nozzle (3a) is fixed on sampling pipe (2) on the short tube mouth with geometrical clamp towards identical with flue gas flow direction; Open vacuum pump (9),, screw barometric damper (9a), turn off vacuum pump (9) wet gas meter (10) zeroing; Rotation sampling pipe (2) allows suction nozzle (3a) towards opposite with flue gas flow direction; Open vacuum pump (9), regulate control damper (9a) to gas meter indication flow velocity and equate that with the flue gas flow rate v that aforementioned calculation goes out simultaneous temperature meter reading is designated as t; Constant speed is after air-breathing a period of time, and rotation sampling pipe (2) allows suction nozzle (3a) towards identical with flue gas flow direction, and the volume reading on the record wet gas meter (10), is designated as V; Pressure reading is designated as Pm, slowly takes out the droplet sampling system then, covers baffle plate; Take off droplet gathering-device (1), bring back the laboratory and weigh, subtract each other with the initial weight of droplet gathering-device (1) and promptly get droplet weight, be designated as m; Saturated vapor pressure Pv in the time of t ℃ can get by tabling look-up; Computing formula according to droplet concentration:
C＝m×1000/{[(Pa+Pm-Pv)×273.15×V]/[(273.15+t)×760]}
Wherein: the concentration of C-droplet, mg/Nm 3
The weight of m-droplet, mg
V-sucks the cumulative volume of flue gas, L
T-wet gas meter thermometer temperature, ℃
The Pa-atmospheric pressure, mmHg
Pm-wet gas meter pressure, mmHg
Saturated vapor pressure in the time of Pv-t ℃, mmHg
Calculate droplet concentration in the flue gas.
2. according to the method for testing of droplet in the described flue gas of claim 1, it is characterized in that: step 1
Described flexible pipe is a silicone tube; Described condenser pipe is shape in the shape of a spiral.
3. according to the method for testing of droplet in the described flue gas of claim 1, it is characterized in that: air-breathing time of the sampling system of droplet described in the step 3 sampled point constant speed in flue is convenient to collect greater than 60min.
CN2007100927582A 2007-09-27 2007-09-27 Flue fog drip test method Active CN101187619B (en)

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