CN111721665A - Method and device for detecting content of condensed water in boiler tail flue gas - Google Patents
Method and device for detecting content of condensed water in boiler tail flue gas Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting the content of condensed water in flue gas at the tail part of a boiler, wherein an electric heating reheating device is additionally arranged at the tail part of the boiler to reheat low-temperature flue gas to a high-temperature state, so that water discharged along with the flue gas in the form of mist-state water droplets and uncondensed water discharged along with the flue gas in the form of supercooled water vapor in the flue gas are reheated to a high-temperature steam state; through the correlation mathematical relationship between the energy balance and the mass balance process, the content of water discharged along with the flue gas in the form of mist-state water drops after condensation and the content of uncondensed water discharged along with the flue gas in the form of supercooled water vapor are calculated.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a method and a device for detecting the content of condensed water in tail flue gas of a boiler.
Background
The state of water in the boiler flue gas can be divided into three types, wherein the first type is water flowing out from the bottom of a condenser in a liquid state after being condensed; the second type is water which is condensed and then discharged along with the flue gas in the form of mist-state water droplets; the third type is uncondensed water discharged with flue gas in the form of supercooled water vapor. The water content of the three states is only the condensed water in the first state, and the water content in the second and third states can be measured by a weighing method, and an accurate and reliable measuring means is not available at present.
When the thermal efficiency of the boiler is calculated, because water vapor in flue gas is condensed, latent heat of vaporization is released, and the heat is absorbed and utilized by a boiler system, but in the condensing process, particularly, how much water vapor is condensed (including first-type and second-type water vapor) and latent heat of vaporization is released, which cannot be measured, so that the conventional method for calculating the condensing boiler can only be used for calculating by a positive balance measuring method, but the positive balance method is greatly influenced by measuring errors of parameters such as flow, fuel heating value and the like, and the testing reliability is poor, and generally requires that reverse balance is taken as a main testing method, such as ASME and other standards.
Disclosure of Invention
The invention aims to solve the problems and provides a method and a device for detecting the content of condensed water in the flue gas at the tail part of a boiler, so that the content of tri-state water in the flue gas is measured, the amount of the condensed water which is discharged and absorbed and utilized and the amount of water vapor which is not condensed can be known, the heat is discharged along with the flue gas, and then the heat loss of the part can be calculated, thereby establishing the reverse balance measurement of the heat efficiency of the condensing boiler.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for detecting the content of condensed water in the tail flue gas of the condensing boiler comprises the following steps:
(1) by the formula
Calculating the total content M of water at the smoke outlet at the tail part of the boiler0，
The volume of water vapor at the tail smoke exhaust position of the boiler comprises the sum of the volume of moisture generated by burning hydrogen in fuel burned by the boiler, the volume of moisture brought by the fuel and the volume of moisture brought by air; rho is the density of water vapor under standard atmospheric pressure;
(2) a condenser is arranged at a smoke outlet at the tail part of the boiler, and the content of effluent water flowing out of the bottom of the condenser in a liquid form after the smoke discharged from the smoke outlet is weighed to be M1；
(3) The outlet of the condenser is provided with an electric heater which changes the passing heat into Q2Heating the flue gas to a temperature at which all water is present in the form of water vapor and the heat is Q3High temperature state of (2), increasing heat quantity is marked as Qλ. The mass of water in the condensed flue gas in the form of mist-like droplets is recorded as M2The mass of water present in the form of supercooled water vapor is denoted as M3；
(4) By the energy conservation formula:
Q3＝Q2+Qinto
And a water mass balance formula in the flue gas:
M0＝M1+M2+M3
deriving the mass of water present in the form of subcooled water vapor
(ii) a Mass of water present in the form of mist-like droplets
M2＝M0-M1-M3。
The device for detecting the content of condensed water in the flue gas at the tail part of the boiler comprises the boiler, wherein a smoke outlet at the tail part of the boiler is provided with a condenser; an electric heater is arranged at a condensed flue gas outlet cooled by the condenser; the condensing boiler is communicated with the condenser through the condensing boiler flue gas outlet, and the condenser is communicated with the electric heater through the connecting flue; the electric heater is also communicated with an electric heater flue gas outlet flue used for discharging heating flue gas; the boiler is provided with a gas inlet, an instrument for measuring the components of gas fuel is arranged at the position of the gas inlet, and a pressure gauge for measuring the local atmospheric pressure is arranged near the boiler; the electric heater is provided with an electric meter; a thermometer is arranged in the connecting flue and the flue gas outlet of the electric heater, a condensed water drain pipe is arranged at the bottom of the condenser, and a weighing device is arranged at the outlet of the condensed water drain pipe.
In the device for detecting the content of condensed water in the flue gas at the tail part of the boiler, the boiler comprises a condenser flue gas inlet flue communicated with a boiler flue gas outlet, a condenser flue gas outlet flue, a condenser box body and a condenser pipe bundle, and the electric heater comprises an electric heater flue gas inlet flue, an electric heater box body and an electric heating pipe bundle; the flue gas outlet of the condenser is communicated with the flue gas inlet of the heater; high-temperature flue gas from the boiler comes out from a flue gas outlet of a condensing boiler, enters a condenser box body through a flue gas inlet flue of the condenser and carries out countercurrent heat exchange with working medium water in a condenser pipe bundle; after heat exchange is completed, the flue gas comes out from the flue gas outlet of the condenser and enters the electric heater box body through the flue gas inlet flue of the electric heater by being connected with the flue, and after the flue gas is heated by the electric heating tube bundle to reach the temperature required by the system, the flue gas is discharged to a chimney through the flue gas outlet flue of the electric heater.
In the device for detecting the content of condensed water in the flue gas at the tail part of the boiler, a condenser water inlet collecting tank and a condenser water outlet collecting tank are arranged in a condenser box body, and working medium water in a condenser is uniformly distributed to a condenser tube bundle through the condenser water inlet collecting tank to perform countercurrent heat exchange with high-temperature flue gas; in the heat exchange process, liquid condensate water is collected from the bottom of the smooth funnel-shaped condenser through a condensate water drain pipe; after the heat exchange is finished, the working medium is converged to the condenser water outlet header from the condenser tube bundle,
in the device for detecting the content of condensed water in the flue gas at the tail part of the boiler, the electric heating tube bundles are uniformly arranged in the electric heater box body; the electric heating tube bundle is also provided with an electric heater wiring hole for supplying power.
In the device for detecting the content of condensed water in the flue gas at the tail part of the boiler, the condenser heat-insulating layers are arranged outside the condenser box bodies; the condenser is also provided with a condenser steel frame which is used for ensuring the rigidity of the whole condenser and is connected with the base; the electric heater is characterized in that the electric heater heat-insulating layers are arranged outside the electric heater box body, and the electric heater is also provided with an electric heater steel frame which is used for ensuring the rigidity of the whole electric heater and is connected with the base.
The beneficial effects produced by adopting the invention are as follows:
1. the technical scheme of the invention is less influenced by measurement errors of parameters such as flow, fuel heating value and the like, and has high reliability.
Drawings
FIG. 1 is a schematic view of the structural principle of the present invention;
FIG. 2 is a schematic diagram of the working principle of the present invention;
FIG. 3 is a schematic diagram of the external structure of the condenser;
fig. 4 is a schematic view of the internal structure of the condenser.
In the figure: 1-condensing the flue gas outlet of the boiler; 2-connecting a flue; 3-a condensing boiler; 301-gas inlet; 302-a pressure gauge; 10-a condenser: 101-condenser box; 102-a condenser water inlet header; 103-a condensate drain pipe; 104-condenser tube bundle; 105-a condenser outlet header; 106-condenser steel frame; 107-flue gas inlet of condenser; 108-condenser insulating layer; 109-flue gas outlet flue of condenser; 21-electric heater 210-electric heater box; 211-electric heater wiring hole; 212-electrically heating the tube bundle; 213-flue gas inlet flue of electric heater; 214-electric heater insulation layer; 215-electric heater steel frame; 216-flue of electric heater flue gas outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, the invention provides a method and a device for detecting the condensed water content in the flue gas at the tail of a boiler, which can realize the measurement of the tri-state water content in the flue gas, so that how much condensed water emits heat to be absorbed and utilized, and how much water vapor is not condensed, the heat is discharged along with the flue gas, and then the heat loss of the part can be calculated, thereby establishing the counter-balance measurement of the heat efficiency of the condensing boiler.
The device for detecting the content of condensed water in the flue gas at the tail part of the boiler comprises a boiler 3, and is characterized in that a smoke outlet at the tail part of the boiler 3 is provided with a condenser 10; an electric heater 21 is arranged at a condensed flue gas outlet cooled by the condenser 10; the boiler is characterized by also comprising a condensation boiler flue gas outlet 1 and a connecting flue 2, wherein the boiler 3 is communicated with a condenser 10 through the boiler flue gas outlet 1, and the condenser 10 is communicated with an electric heater 21 through the connecting flue 2; the electric heater 21 is also communicated with an electric heater flue gas outlet flue 216 for discharging heating flue gas; the boiler (3) is provided with a gas inlet (301), an instrument for measuring gas fuel components is arranged at the position of the gas inlet (301), and a pressure gauge (302) for measuring local atmospheric pressure is arranged near the boiler (3); the electric heater 21 is provided with an electric meter; a thermometer is arranged in the connecting flue 2 and the flue gas outlet 216 of the electric heater, a condensed water drain pipe 103 is arranged at the bottom of the condenser 10, and a weighing mechanism is arranged at the outlet of the condensed water drain pipe 103.
The boiler 3 comprises a condenser flue gas inlet flue 107 communicated with the boiler flue gas outlet 1, a condenser flue gas outlet flue 109, a condenser box 101 and a condenser tube bundle 104, and the electric heater 21 comprises an electric heater flue gas inlet flue 213, an electric heater box 210 and an electric heating tube bundle 212; the condenser flue gas outlet flue 109 is communicated with a heater flue gas inlet flue 213; high-temperature flue gas from the boiler 3 comes out from a boiler flue gas outlet 1 and enters the condenser box 101 through a condenser flue gas inlet flue 107 to perform countercurrent heat exchange with the working fluid in the condenser tube bundle 104; after heat exchange is completed, the flue gas comes out from the condenser flue gas outlet flue 109, enters the electric heater box body 210 through the connecting flue 2 and the electric heater flue gas inlet flue 213, and is discharged to a chimney through the electric heater flue gas outlet flue 216 after being heated by the electric heating tube bundle 212 to reach the temperature required by the system;
a condenser inlet header 102 and a condenser outlet header 105 are arranged in the condenser box body 101, and working medium water in the condenser 10 is uniformly distributed to the condenser tube bundles 104 through the condenser inlet header 102 to perform countercurrent heat exchange with high-temperature flue gas; in the heat exchange process, liquid condensate water is collected from the bottom of the smooth funnel-shaped condenser through a condensate water drain pipe 103; after heat exchange is completed, working medium is collected from the condenser tube bundle 104 to the condenser outlet header 105 and finally to the boiler system. In order to ensure that the heat dissipation loss of the condenser reaches the minimum, a condenser heat-insulating layer 108 is arranged outside the whole condenser box body 101; the rigidity of the whole condenser and the connection with the base are ensured by the condenser steel frame 106.
The electric heating tube bundles 212 are uniformly arranged in the electric heater box 210; the electric heating tube bundle 212 supplies power through the electric heater wiring hole 211, so that the purpose of heating the flue gas is achieved; in order to ensure that the heat dissipation loss of the electric heater reaches the minimum, an electric heater heat insulation layer 214 is arranged outside the whole electric heater box body 210; the rigidity and the connection with the base of the whole electric heater are ensured by the electric heater steel frame 215.
Flue gas flow: the high-temperature flue gas from the boiler carries out countercurrent heat exchange with the working medium (water) when passing through the condenser 10, and then passes through the electric heater 21 to heat the flue gas, so that the temperature of the flue gas is heated to high temperature;
flue gas passes through the condenser 10 from left to right, working medium (water) performs countercurrent heat exchange from right to left, and the bottom of the condenser is made into a smooth funnel shape, so that liquid condensate water is convenient to collect;
the heating pipes are uniformly distributed in a reheater of the electric heater 21, and the flue gas is guaranteed to be heated to the required temperature through inputting electric quantity.
Referring to fig. 1 and 2, the electric heating reheating device is additionally arranged at the tail part of the condensing boiler, so that the low-temperature flue gas is reheated to a high-temperature state, and water discharged along with the flue gas in the form of mist-state water droplets and uncondensed water discharged along with the flue gas in the form of supercooled water vapor in the flue gas are reheated to a high-temperature steam state; in the process, establishing an energy balance relation of a reheating process of condensed water in the flue gas and a mass balance relation of water content in the flue gas in the condensing and reheating processes; and calculating the content of water discharged with the flue gas in the form of mist-state water droplets after condensation and the content of uncondensed water discharged with the flue gas in the form of supercooled water vapor through the correlation mathematical relationship between the energy balance process and the mass balance process. Setting:
M0the total content of water at the boiler smoke discharge position is unit kg/m3(water content/fuel consumption per cubic unit, the same applies below);
M1the content of water flowing out of the bottom of the condenser in liquid form after condensation is unit kg/m3；
M2The content of water discharged with the flue gas in the form of mist-state water drops after condensation is unit kg/m3；
M3The unit kg/m is the content of uncondensed water discharged along with flue gas in the form of supercooled water vapor3；
Wherein M is1Measurement can be carried out by weighing, in order to obtain M2And M3Consider the following measurement setup:
the device is additionally provided with a set of electric heater 21 which can accurately measure the input heat behind the boiler condenser, and the flue gas containing condensed water is reheated to a high temperature state. The method attempts to solve for M by the two formulas2、M3. The measurement items are shown in table 1.
Table 1 description of measurement items
The symbols of the relevant parameters of the calculation process are shown in a table 2, wherein part of data are obtained according to tables and annexes in thermodynamic calculation-standard method of boiler units.
TABLE 2 notation of parameters relevant to the calculation process
The calculation process mainly comprises the following steps:
the mass balance relationship of the condensed water in the condensation process can be obtained as follows:
two equilibrium formulas can be established respectively:
formula of conservation of mass: m2＝M0-(M1+M3)
Wherein
M1Is a measured value
The energy conservation formula can be obtained by the energy balance relation of the flue gas reheating process:
Q3＝Q2+Qinto
Wherein:
Qλ＝3600*N
by combining the above formulas, we can get:
the derivation process is as follows:
the volume of water vapor at the smoke exhaust position of a smoke outlet 1 of the condensing boiler is m3/m3Calculated from equation (2):
Combustion of hydrogen in fuel produces water vapor
Water vapour formed by evaporation of water from fuel
Water vapour entrained by moisture in the air
In the formula (2), the first and second groups,
dq: the humidity of the gaseous fuel is kg/m of water vapor contained in the gaseous fuel per standard cubic meter of dry gas3；
dk: absolute humidity of air, kg/kg (dry air); can be directly checked by a wet air line calculation chart, and can also be calculated according to the following formula:
in the formula: phi is the relative humidity of air measured according to the dry and wet bulb temperatures,%;
pact: in situ atmospheric pressure, (local atmospheric pressure, actual measurement) Pa;
(pb)0: at t0Water vapor saturation pressure at temperature, Pa; calculated over the range of 0 to 50 ℃ according to the formula:
V0: theoretical dry air quantity, m, calculated on the basis of the composition of the application3/m3(ii) a According to equation (5) to calculate
α: the excess air coefficient at the exhaust smoke is calculated according to the formula (6)
The mass of water vapor at the smoke outlet 1 of the condensing boiler is Kg/m3Calculated from equation (7):
in the formula: ρ: density of water vapor under standard atmospheric pressure in Kg/m3(0.804Kg/m3)
The mass of liquid water in the flue gas in the connecting flue 2 is Kg/m3Calculated from equation (8):
M2＝M0-(M1+M3)··························(8)
in the formula: m1The amount of water discharged from the condenser in Kg/m of partial vapor water condensed into liquid water after the flue gas is condensed3(test data);
M3the mass of the uncondensed water vapor in Kg/m after the flue gas is condensed3(unknown quantity).
2.2 conservation of energy
2.2.1 connecting the water (i.e. M) in the flue gas at the interior of the flue 2 by electrical heating2+M3) Heat consumed in the vapour state heated to a certain temperature, in KJ/m3Calculated from equation (9):
Qλ＝3600*N····························(9)
in the formula: N-Electrical heating hourly Power consumption, in KW (test data).
2.2.2 Heat of flue gas in the second connecting flue 2, in KJ/m3Calculated from equation (10):
in the formula:
1)Iair 2Air heat value, unit KJ/m3Calculated according to equation (11):
Iair 2＝V0*CAir 2*T2························(11)
CAir 2Air average specific constant pressure heat capacity in units KJ/(m) at temperature in connecting flue 23DEG C) (lookup table)
2)
RO in flue gas in a connecting flue 22Heat value of (1), unit KJ/m3Calculated from equation (12):
in the formula:
RO in flue gas2Volume of (d), unit m3/m3Calculated according to equation (13):
T2-temperature of the flue gas in the connecting flue 2 in units of degrees C (test data)
3)
N in flue gas in connecting flues 22Heat value of (1), unit KJ/m3Calculated from equation (14):
in the formula:
n in flue gas2Volume of (d), unit m3/m3Calculated according to equation (15):
4)
The heat value of the liquid water in the flue gas in the connecting flue 2, in KJ/m3Calculated from equation (16):
in the formula: h isLiquid 2Connecting the enthalpy of the temperature water in the flue 2, in KJ/Kg (Table lookup)
5)
The calorific value of the vaporous water in the flue gas in the connecting flue 2, in KJ/m3Calculated from equation (17):
in the formula: h isSteam 2The enthalpy of the temperature steam in the connecting flue 2, in KJ/Kg (Table lookup)
2.2.3 Heat of flue gas at the flue gas outlet flue 216 of the electric heater, unit KJ/m3Calculated from equation (18):
in the formula:
1)Iair 3Air heat value, unit KJ/m3Calculated according to equation (19):
Iair 3＝V0*CAir 3*T3························(19)
CAir 3Air average specific constant pressure heat capacity in KJ/(m) unit at 216 temperature of flue gas outlet flue of electric heater3DEG C) (lookup table)
2)
RO in the flue gas of the flue gas outlet flue 216 of the electric heater2Heat value of (1), unit KJ/m3Calculated from equation (20):
in the formula:
RO in flue gas2Volume of (d), unit m3/m3Calculated according to equation (21):
T3-smoke temperature in flue 216 of electric heater smoke outlet, unit ℃ (test data)
3)
N in flue gas in connecting flues 22Heat value of (1), unit KJ/m3Calculated from equation (22):
in the formula:
n in flue gas2Volume of (d), unit m3/m3Calculated according to equation (23):
in the above formula: h isSteam 3Enthalpy of steam at 216 temperature in flue gas outlet of electric heater in KJ/Kg (Table lookup)
Available from conservation of energy (25)
Q3＝Q2+QInto···························(25)
The unknown quantity M can be calculated by substituting the formulas (8), (9), (10) and (18) into the formula (25)3. The invention is less influenced by the measurement error of parameters such as flow, fuel heating value and the like, and has high test reliability.
The foregoing is a more detailed description of the invention that is presented in connection with specific embodiments, which are not intended to limit the invention to the particular embodiments described herein. For a person skilled in the art to which the invention pertains, several equivalent alternatives or obvious modifications, all of which have the same properties or uses, without departing from the inventive concept, should be considered as falling within the scope of the patent protection of the invention, as determined by the claims filed.
Claims (6)
1. A method for detecting the content of condensed water in the tail flue gas of a boiler is characterized by comprising the following steps:
(1) by the formula
Calculating the total content M of water at the smoke outlet at the tail part of the boiler0，
Is a water vapor body at the smoke exhaust position at the tail part of the boilerA volume comprising the sum of the volume of moisture produced by combustion of hydrogen in the boiler combustion fuel, moisture entrained by the fuel and moisture entrained by the air; rho is the density of water vapor under standard atmospheric pressure;
(2) a condenser is arranged at a smoke outlet at the tail part of the boiler, and the mass of condensed water flowing out of the bottom of the condenser in a liquid form is weighed as M1；
(3) The outlet of the condenser is provided with an electric heater which changes the passing heat into Q2Heating the flue gas to a temperature at which all water is present in the form of water vapor and the heat is Q3High temperature state of (2), increasing heat quantity is marked as Qλ. The mass of water in the condensed flue gas in the form of mist-like droplets is recorded as M2The mass of water present in the form of supercooled water vapor is denoted as M3；
(4) By the energy conservation formula:
Q3＝Q2+Qinto
And a water mass balance formula in the flue gas:
M0＝M1+M2+M3；
deriving the mass of water present in the form of subcooled water vapor
M2＝M0-M1-M3。
2. A device for detecting the content of condensed water in the tail flue gas of a boiler comprises the boiler (3), and is characterized in that a smoke outlet at the tail of the boiler (3) is provided with a condenser (10); an electric heater (21) is arranged at a condensed flue gas outlet cooled by the condenser (10); the boiler is characterized by also comprising a condensation boiler flue gas outlet (1) and a connecting flue (2), wherein the boiler (3) is communicated with a condenser (10) through the boiler flue gas outlet (1), and the condenser (10) is communicated with an electric heater (21) through the connecting flue (2); the electric heater (21) is also communicated with an electric heater flue gas outlet flue (216) for discharging heating flue gas; the boiler (3) is provided with a gas inlet (301), an instrument for measuring gas fuel components is arranged at the position of the gas inlet (301), and a pressure gauge (302) for measuring local atmospheric pressure is arranged near the boiler (3); the electric heater (21) is provided with an electric meter; a thermometer is arranged in the connecting flue (2) and the flue gas outlet flue (216) of the electric heater, a condensed water drain pipe (103) is arranged at the bottom of the condenser (10), and a weighing mechanism is arranged at the outlet of the condensed water drain pipe (103).
3. The device for detecting the content of condensed water in the flue gas at the tail of the boiler as claimed in claim 2, wherein: the boiler (3) comprises a condenser flue gas inlet flue (107) communicated with the boiler flue gas outlet (1), a condenser flue gas outlet flue (109), a condenser box body (101) and a condenser tube bundle (104), and the electric heater (21) comprises an electric heater flue gas inlet flue (213), an electric heater box body (210) and an electric heating tube bundle (212); the condenser flue gas outlet flue (109) is communicated with the heater flue gas inlet flue (213); high-temperature flue gas from the boiler (3) comes out from a flue gas outlet (1) of a condensing boiler, enters a condenser box body (101) through a flue gas inlet flue (107) of a condenser and carries out countercurrent heat exchange with working medium water in a condenser tube bundle (104); after heat exchange is finished, the flue gas comes out from a flue gas outlet flue (109) of the condenser, enters an electric heater box body (210) through a connecting flue (2) and a flue gas inlet flue (213) of the electric heater, and is heated by an electric heating tube bundle (212) to reach the temperature required by the system and then is discharged to a chimney through a flue gas outlet flue (216) of the electric heater.
4. The device for detecting the content of condensed water in the flue gas at the tail of the boiler as claimed in claim 3, wherein: a condenser water inlet header (102) and a condenser water outlet header (105) are arranged in the condenser box body (101), and working medium water in the condenser (10) is uniformly distributed to a condenser tube bundle (104) through the condenser water inlet header (102) to perform countercurrent heat exchange with high-temperature flue gas; in the heat exchange process, liquid condensate water is collected from the bottom of the smooth funnel-shaped condenser through a condensate water drain pipe (103); after heat exchange is finished, working medium is collected to a condenser water outlet header (105) from a condenser tube bundle (104).
5. The device for detecting the content of condensed water in the flue gas at the tail of the boiler as claimed in claim 3, wherein: the electric heating tube bundles (212) are uniformly arranged in the electric heater box body (210); the electric heating tube bundle (212) is also provided with electric heater wiring holes (211) for supplying power.
6. The device for detecting the content of condensed water in the flue gas at the tail of the boiler as claimed in claim 3, wherein: a condenser heat-insulating layer (108) is arranged outside the condenser box body (101); the condenser (10) is also provided with a condenser steel frame (106) which is used for ensuring the rigidity of the whole condenser (10) and is connected with the base; an electric heater heat-insulating layer (214) is arranged outside the electric heater box body (210), and an electric heater steel frame (106) which is used for ensuring the rigidity of the whole electric heater (21) and is connected with the base is further arranged on the electric heater (21).
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Citations (12)
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