CN203220852U - Intelligent demercuration additive adding system for coal-fired power plant - Google Patents

Intelligent demercuration additive adding system for coal-fired power plant Download PDF

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Publication number
CN203220852U
CN203220852U CN 201320095554 CN201320095554U CN203220852U CN 203220852 U CN203220852 U CN 203220852U CN 201320095554 CN201320095554 CN 201320095554 CN 201320095554 U CN201320095554 U CN 201320095554U CN 203220852 U CN203220852 U CN 203220852U
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CN
China
Prior art keywords
flue gas
mercury
ductwork
flue
demercuration
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Withdrawn - After Issue
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CN 201320095554
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Chinese (zh)
Inventor
殷立宝
郑双清
高正阳
曾庭华
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Priority to CN 201320095554 priority Critical patent/CN203220852U/en
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Abstract

The utility model discloses an intelligent demercuration additive adding system for a coal-fired power plant. The intelligent demercuration additive adding system comprises a continuous online smoke mercury monitoring device, a crushing device, a screw feeder, a circulating flue, a fan and an intelligent control device, wherein a smoke outlet of the circulating flue is formed in an outlet of a coal economizer in a tail flue, a smoke inlet of the circulating flue is formed in an air preheater inlet in the tail flue, the fan is arranged in the circulating flue, a feeding hole of the screw feeder is communicated with a discharging hole of the crushing device, a discharging hole of the screw feeder is led to the circulating flue, a monitoring probe of the continuous online smoke mercury monitoring device is arranged in the tail flue, and the continuous online smoke mercury monitoring device and the screw feeder are respectively electrically connected with corresponding ports of the intelligent control device. The intelligent demercuration additive adding system has the characteristics of accurate adding quantity of a demercuration additive, high utilization efficiency and good demercuration effect.

Description

A kind of demercuration additive intelligence add-on system for coal fired power plant
Technical field
The utility model relates to a kind of flue gas mercury removal device, specifically a kind of demercuration additive intelligence add-on system for coal fired power plant.
Background technology
The mercury of coal combustion discharging is the main source of mercury pollution in the atmosphere, and the mercury in the atmosphere can enter human body by respiratory tract or food chain, is detrimental to health.As shown in Figure 1, the flue gas that boiler furnace 1 produces in the existing coal fired power plant is discharged from chimney 11 through back-end ductwork, is provided with economizer 2, air preheater 8, electrostatic precipitator 9 and wet desulfuration tower 10 in the back-end ductwork successively.Play superfine people's research according to the king, the average content of mercury is 0.22mg/kg in the coal in China, the annual Coal-fired capacity estimation in the whole nation, national power station Coal-fired capacity was about 1,400,000,000 tons in 2010, power plant discharges the mercury amount altogether and just reaches 300 tons, the mercury pollution problem has become the focus that the whole world is paid close attention to, and also is the environmental problem that China presses for solution.
At present, mainly concentrate on both direction at the research of coal fired power plant demercuration aspect, a direction is to develop demercuration adsorbent, and another direction is to utilize to add oxidant with the simple substance mercury (Hg in the flue gas 0) be oxidized to gaseous state divalence mercury (Hg 2+), and then adsorbed by flying dust and remove at wet desulfurization system.
Wherein, the exploitation of demercuration adsorbent mainly comprises: absorbent charcoal based, calcium base and flying dust base absorbant and some new adsorbents etc.In the prior art, effective and the most widely used removal simple substance mercury technology is that active carbon sprays into technology, though can this obvious technical effects-remove 99% simple substance mercury, but the operating cost of this technology, the cost that mainly is active carbon is higher, thereby can not promote the use of on a large scale.Ca-base adsorbent is better to gaseous state divalence mercury adsorption effect, but relatively poor to simple substance mercury adsorption effect.
Be easy to by flying dust absorption and soluble in water because gaseous state divalence mercury has, therefore, utilize the interpolation oxidant to become gaseous state divalence mercury can improve existing pollution control facility greatly to the removal effect of mercury the simple substance mercury oxidation in the flue gas.Therefore, add the oxidant demercuration method and have good application prospects.
The addition manner of additive has material impact to the demercuration effect, in order to reach desirable demercuration effect, designs suitable adding set and seems very necessary.Traditional adding set major part is the addition by coal-supplying amount control additive, but for the demercuration adding set, addition is influenced by coal-supplying amount not only, also is subjected to coal mercury concentration affects, and only the addition by coal-supplying amount control additive does not reach desirable additive effect.Therefore, demercuration additive adding set reasonable in design is significant to the coal fired power plant demercuration.
The utility model content
Technical problem to be solved in the utility model, just provide and a kind ofly not only consider coal-supplying amount influence, also consider the demercuration additive intelligence add-on system that is used for coal fired power plant of mercury concentration affects in the coal and economical and efficient, have that the additive addition is accurate, utilization ratio is high and the demercuration good effectiveness.
Solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of demercuration additive intelligence add-on system for coal fired power plant, the flue gas that boiler furnace produces in the described coal fired power plant is discharged from chimney through back-end ductwork, is provided with economizer, air preheater, electrostatic precipitator and wet desulfuration tower in the back-end ductwork successively; It is characterized in that: described intelligent add-on system comprises the continuous on-Line Monitor Device of flue gas mercury, breaker, screw(-type) feeder, cycle flue, blower fan and intelligence controlling device; The exhaust opening of described cycle flue is located at economizer exit place in the back-end ductwork, advance mouth is located at air preheater import department in the back-end ductwork, described blower fan is installed in the cycle flue, the charging aperture of described screw(-type) feeder is connected with the discharging opening of breaker, discharging opening leads to cycle flue, the monitoring probe of the continuous on-Line Monitor Device of described flue gas mercury is arranged in the back-end ductwork, and the continuous on-Line Monitor Device of described flue gas mercury and screw(-type) feeder are electrically connected with the corresponding port of intelligence controlling device respectively.
For the demercuration additive is reacted with simple substance mercury under suitable temperature, improve flue gas demercuration efficient, as preferred embodiment of the present utility model, the monitoring probe of the continuous on-Line Monitor Device of described flue gas mercury is arranged in the pipeline section of back-end ductwork between economizer and air preheater.
As a kind of embodiment of the present utility model, described intelligence controlling device comprises for the motor that drives described screw(-type) feeder rotation with for the controller of controlling described screw(-type) feeder rotating speed; Described controller comprises multiplier, function generator and PID controller, two inputs of described multiplier are electrically connected with flue gas flow signal output part and the elemental mercury concentration signal output part of the continuous on-Line Monitor Device of flue gas mercury respectively, the output of described multiplier is electrically connected by the sp port of function generator and PID controller, the pv port of PID controller and the tach signal output of motor are electrically connected, and the work control end of the output of PID controller and motor is electrically connected.
Demercuration additive intelligence add-on system of the present utility model is when work, blower fan is pumped into the flue gas of back-end ductwork cycle flue and is discharged to the back-end ductwork again by exhaust opening from advancing mouth, in cycle flue, to form flue gas stream, breaker is broken into Powdered leaving in the screw(-type) feeder with the demercuration additive, back-end ductwork flue gas real-time traffic and simple substance mercury real-time concentration that intelligence controlling device monitors according to the continuous on-Line Monitor Device of flue gas mercury, the delivery rate of control screw(-type) feeder makes the demercuration additive of screw(-type) feeder output render in the back-end ductwork with the flue gas in the cycle flue.
Compared with prior art, the utlity model has following beneficial effect:
Demercuration additive intelligence add-on system of the present utility model detects flue gas real-time traffic and the simple substance mercury real-time concentration that obtains in the back-end ductwork by the continuous on-Line Monitor Device of flue gas mercury, calculated the real-time content of simple substance mercury by intelligence controlling device, and the control screw(-type) feeder is according to the delivery rate of the real-time content output of this simple substance mercury demercuration additive, the demercuration additive is thrown in the back-end ductwork with the flue gas in the cycle flue, and, the demercuration additive is ground into Powdered through breaker, be more conducive to fully react with simple substance mercury, therefore, it is accurate to the utlity model has demercuration additive addition, high and the demercuration good effectiveness of utilization ratio.
Description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the fume emission schematic diagram of coal fired power plant in the prior art;
Fig. 2 is structural representation of the present utility model;
Fig. 3 is the schematic block circuit diagram of intelligence controlling device in the utility model;
Among the figure, 1-boiler furnace, 2-economizer, the continuous on-Line Monitor Device of 3-flue gas mercury, 4-breaker, 5-screw(-type) feeder, 6-cycle flue, 7-blower fan, 8-air preheater, 9-electrostatic precipitator, 10-wet method fume desulfurizing system, 11-chimney.
The specific embodiment
As shown in Figure 2, demercuration additive intelligence add-on system of the present utility model is applied to coal fired power plant, the flue gas that boiler furnace 1 produces in the coal fired power plant is discharged from chimney 11 through back-end ductwork, is provided with economizer 2, air preheater 8, electrostatic precipitator 9 and wet desulfuration tower 10 in the back-end ductwork successively.Demercuration additive intelligence add-on system of the present utility model comprises the continuous on-Line Monitor Device 3 of flue gas mercury, breaker 4, screw(-type) feeder 5, cycle flue 6, blower fan 7 and intelligence controlling device.Wherein, the exhaust opening of cycle flue 6 is located at economizer 2 exits in the back-end ductwork, advance mouth is located at air preheater 8 import departments in the back-end ductwork, the continuous on-Line Monitor Device 3 of flue gas mercury adopts existing model commonly used, concentration that can real time on-line monitoring flue gas mercury, its monitoring probe is arranged in the pipeline section of back-end ductwork between economizer 2 and air preheater 8, detects the flue gas real-time traffic (m that obtains wherein 3/ s) with simple substance mercury real-time concentration (μ g/m 3); Blower fan 7 is installed in the cycle flue 6, and the charging aperture of screw(-type) feeder 5 is connected with the discharging opening of breaker 4, discharging opening leads to cycle flue 6.
As shown in Figure 3, intelligence controlling device comprises for the motor M that drives screw(-type) feeder 5 rotations with for the controller of controlling screw(-type) feeder 5 rotating speeds; Controller comprises multiplier X, function generator F (x) and PID controller, two inputs of multiplier are electrically connected with flue gas flow signal output part and the elemental mercury concentration signal output part of the continuous on-Line Monitor Device 3 of flue gas mercury respectively, the output of multiplier is electrically connected by the sp port of function generator and PID controller, the pv port of PID controller and the tach signal output of motor M are electrically connected, and the work control end of the output of PID controller and motor M is electrically connected.Multiplier receives the flue gas real-time traffic signal (m of continuous on-Line Monitor Device 3 outputs of flue gas mercury 3/ s) with simple substance mercury real-time concentration signal (μ g/m 3), calculate the real-time content (μ g/s) of simple substance mercury in the flue gas, function generator generates corresponding function according to additive adding proportion given in advance, calculate the tach signal set-point of motor M, the deviation of this tach signal set-point and motor M actual speed draws the rotating speed that motor speed instructs to control motor M after the computing of PID controller, motor M drives screw(-type) feeder 5 and rotates, and additive is added by the simple substance mercury content signal of flue gas.
The operation principle of the intelligent add-on system of the utility model demercuration additive is as follows:
The flue gas that boiler furnace 1 produces in the coal fired power plant is via back-end ductwork, successively by economizer 2, air preheater 8, discharge from chimney 11 electrostatic precipitator 9 and wet desulfuration tower 10 backs, blower fan 7 is pumped into the flue gas of back-end ductwork cycle flue 6 and is discharged to the back-end ductwork again by exhaust opening from advancing mouth, in cycle flue 6, to form flue gas stream, exhaust gas volumn in cycle flue 6 is by blower fan 7 controls, breaker 4 is broken into Powdered leaving in the screw(-type) feeder 5 with the demercuration additive, be beneficial to that the demercuration additive sprays into and then fully react with simple substance mercury in the flue gas, the rotating speed of the back-end ductwork flue gas real-time traffic that intelligence controlling device monitors according to the continuous on-Line Monitor Device 3 of flue gas mercury and simple substance mercury real-time concentration control motor M, thereby realize the control to the delivery rate of screw(-type) feeder 5, the demercuration additive of screw(-type) feeder 5 outputs is rendered in the back-end ductwork with the flue gas in the cycle flue 6, enter the reaction of the additive of back-end ductwork and the simple substance mercury in the flue gas, make it to be converted into gaseous state divalence mercury, part gaseous state divalence mercury is adsorbed by flying dust and then removes in electrostatic precipitator 9, some gaseous state divalence mercury removes at wet method fume desulfurizing system 10 thereafter, drain into atmosphere through the flue gas smoke-input tube 11 behind the wet method fume desulfurizing system 10, significantly reduced the discharging of flue gas mercury.
The utility model does not limit to and the above-mentioned specific embodiment; according to foregoing; ordinary skill knowledge and customary means according to this area; do not breaking away under the above-mentioned basic fundamental thought of the utility model prerequisite; the utility model can also be made equivalent modifications, replacement or the change of other various ways, all drops among the protection domain of the present utility model.

Claims (3)

1. demercuration additive intelligence add-on system that is used for coal fired power plant, the flue gas that boiler furnace in the described coal fired power plant (1) produces is discharged from chimney (11) through back-end ductwork, be provided with economizer (2), air preheater (8), electrostatic precipitator (9) and wet desulfuration tower (10) in the back-end ductwork successively, it is characterized in that: described intelligent add-on system comprises the continuous on-Line Monitor Device of flue gas mercury (3), breaker (4), screw(-type) feeder (5), cycle flue (6), blower fan (7) and intelligence controlling device; The exhaust opening of described cycle flue (6) is located at economizer (2) exit in the back-end ductwork, advance mouth and be located at air preheater (8) import department in the back-end ductwork, described blower fan (7) is installed in the cycle flue (6), the charging aperture of described screw(-type) feeder (5) is connected with the discharging opening of breaker (4), discharging opening leads to cycle flue (6), the monitoring probe of the continuous on-Line Monitor Device of described flue gas mercury (3) is arranged in the back-end ductwork, and the continuous on-Line Monitor Device of described flue gas mercury (3) and screw(-type) feeder (5) are electrically connected with the corresponding port of intelligence controlling device respectively.
2. the demercuration additive intelligence add-on system for coal fired power plant according to claim 1 is characterized in that: the monitoring probe of the continuous on-Line Monitor Device of described flue gas mercury (3) is arranged on back-end ductwork and is arranged in pipeline section between economizer (2) and the air preheater (8).
3. the demercuration additive intelligence add-on system for coal fired power plant according to claim 1 and 2 is characterized in that: described intelligence controlling device comprises for driving the motor (M) that described screw(-type) feeder (5) rotates and the controller that is used for control described screw(-type) feeder (5) rotating speed; Described controller comprises multiplier, function generator and PID controller, two inputs of described multiplier are electrically connected with flue gas flow signal output part and the elemental mercury concentration signal output part of the continuous on-line monitoring system of flue gas mercury (3) respectively, the output of described multiplier is electrically connected by the sp port of function generator and PID controller, the tach signal output of the pv port of PID controller and motor (M) is electrically connected, and the work control end of the output of PID controller and motor (M) is electrically connected.
CN 201320095554 2013-03-01 2013-03-01 Intelligent demercuration additive adding system for coal-fired power plant Withdrawn - After Issue CN203220852U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103170236A (en) * 2013-03-01 2013-06-26 广东电网公司电力科学研究院 Intelligent demercuration addition agent adding system for coal-fired power plant
CN104028101A (en) * 2014-06-23 2014-09-10 李玢 Flue gas desulfurization and demercuration integrated system and process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103170236A (en) * 2013-03-01 2013-06-26 广东电网公司电力科学研究院 Intelligent demercuration addition agent adding system for coal-fired power plant
CN103170236B (en) * 2013-03-01 2015-04-22 广东电网公司电力科学研究院 Intelligent demercuration addition agent adding system for coal-fired power plant
CN104028101A (en) * 2014-06-23 2014-09-10 李玢 Flue gas desulfurization and demercuration integrated system and process
CN104028101B (en) * 2014-06-23 2016-04-13 李玢 Flue gas desulfurizing and hydrargyrum-removing integral system and technique

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AV01 Patent right actively abandoned

Granted publication date: 20131002

Effective date of abandoning: 20150422