CN103170236B - Intelligent demercuration addition agent adding system for coal-fired power plant - Google Patents

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

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Publication number
CN103170236B
CN103170236B CN201310065948.0A CN201310065948A CN103170236B CN 103170236 B CN103170236 B CN 103170236B CN 201310065948 A CN201310065948 A CN 201310065948A CN 103170236 B CN103170236 B CN 103170236B
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demercuration
ductwork
mercury
flue
feeder
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CN103170236A (en
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殷立宝
郑双清
高正阳
曾庭华
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China Southern Power Grid Power Technology Co.,Ltd.
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Abstract

The invention discloses an intelligent demercuration addition agent adding system for a coal-fired power plant. The intelligent demercuration addition agent adding system comprises a smoke mercury continuous on-line monitoring plant, 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 the outlet of an economizer in a tail flue, and a smoke inlet of the circulating flue is formed in the inlet of an air preheater in the tail flue; the fan is arranged in the circulating flue, a feeding port of the screw feeder is communicated with a discharge port of the crushing device, the discharge port of the screw feeder leads to the circulating flue, and a monitoring probe of the smoke mercury continuous on-line monitoring plant is arranged in the tail flue; and the smoke mercury continuous on-line monitoring device and the screw feeder are respectively and electrically connected with corresponding ports of the intelligent control device. The intelligent demercuration addition agent adding system provided by the invention has the characteristics that additive amount of a demercuration addition agent is exact, the utilization efficiency is high and a demercuration effect is good.

Description

A kind of intelligence of the demercuration additive for coal fired power plant add-on system
Technical field
The present invention relates to a kind of flue gas mercury removal device, specifically a kind of intelligence of the demercuration additive for coal fired power plant add-on system.
Background technology
The mercury of Discharged form Coal Combustion is the main source of mercury pollution in air, and the mercury in air enters human body by respiratory tract or food chain, is detrimental to health.As shown in Figure 1, the flue gas that in existing coal fired power plant, boiler furnace 1 produces 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 back-end ductwork successively.The research of superfine people is played according to king, in coal in China, the average content of mercury is 0.22mg/kg, the annual Coal-fired capacity estimation in the whole nation, national power station Coal-fired capacity about 1,400,000,000 tons in 2010, power plant discharges mercury quantity altogether and just reaches 300 tons, mercury pollution problem has become the focus that the whole world is paid close attention to, the environmental problem that Ye Shi China is in the urgent need to address.
At present, the research for coal fired power plant demercuration aspect mainly concentrates on both direction, and a direction develops demercuration adsorbent, and another direction utilizes to add oxidant by the Elemental Mercury (Hg in flue gas 0) be oxidized to gaseous state bivalent 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 prior art, the most effectively and the most widely used removal Elemental Mercury technology be that active carbon sprays into technology, although can the Elemental Mercury of this obvious technical effects-remove 99%, but the operating cost of this technology, mainly the cost of active carbon is higher, thus can not promote the use of on a large scale.Ca-base adsorbent is better to gaseous state bivalent mercury adsorption effect, but poor to Elemental Mercury adsorption effect.
Due to gaseous state bivalent mercury have be easy to by flying dust absorption and soluble in water, therefore, utilize interpolation oxidant become by the elemental mercury oxidation in flue gas gaseous state bivalent mercury greatly can improve the removal effect of existing pollution control facility to mercury.Therefore, add oxidant demercuration method and there is good application prospect.
The addition manner of additive has material impact to demercuration effect, in order to reach desirable demercuration effect, designing suitable adding set and seeming very necessary.Traditional adding set major part is the addition by Limestone control additive, but for demercuration adding set, addition not only affects by coal-supplying amount, also affects by coal mercury concentration, does not only reach desirable additive effect by the addition of Limestone control additive.Therefore, demercuration additive-adding device reasonable in design is significant to coal fired power plant demercuration.
Summary of the invention
Technical problem to be solved by this invention, just be to provide the impact of a kind of not only consideration coal-supplying amount, also consider that in coal, mercury concentration affects and the demercuration additive for coal fired power plant of economical and efficient intelligence add-on system, has the advantages that additive addition is accurate, utilization ratio is high and demercuration is effective.
Solve the problems of the technologies described above, the present invention adopts following technical scheme:
For a demercuration additive intelligence add-on system for coal fired power plant, the flue gas that in described coal fired power plant, boiler furnace produces is discharged from chimney through back-end ductwork, is provided with economizer, air preheater, electrostatic precipitator and wet desulfuration tower successively in back-end ductwork; It is characterized in that: described intelligent add-on system comprises the continuous on-Line Monitor Device of gas mercury, breaker, screw(-type) feeder, cycle flue, blower fan and intelligent controlling device; The exhaust opening of described cycle flue is located at economizer exit place in back-end ductwork, enter mouth is located at air preheater import department in back-end ductwork, described assembling is in 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 gas mercury is arranged in back-end ductwork, and the continuous on-Line Monitor Device of described gas mercury and screw(-type) feeder are electrically connected with the corresponding port of intelligent controlling device respectively.
React with Elemental Mercury at a suitable temperature to make demercuration additive, improve flue gas demercuration efficiency, as the preferred embodiment of the present invention, the monitoring probe of the continuous on-Line Monitor Device of described gas mercury is arranged in the pipeline section of back-end ductwork between economizer and air preheater.
As one embodiment of the present invention, described intelligent controlling device comprises the motor for driving described screw(-type) feeder to rotate and the controller for controlling described screw(-type) feeder rotating speed; Described controller comprises multiplier, function generator and PID controller, the flue gas flow signal output part of continuous on-Line Monitor Device and elemental mercury concentration signal output part are electrically connected with gas mercury respectively for two inputs of described multiplier, the output of described multiplier is connected with the sp port electrical of PID controller by function generator, the pv port of PID controller and the tach signal output of motor are electrically connected, and the output of PID controller and the job control end of motor are electrically connected.
Demercuration additive intelligence add-on system of the present invention operationally, the flue gas of back-end ductwork is pumped into cycle flue from entering mouth and is again discharged to back-end ductwork by exhaust opening by blower fan, to form flue gas stream in cycle flue, demercuration additive is broken into and Powderedly leaves in screw(-type) feeder by breaker, the back-end ductwork flue gas real-time traffic that the continuous on-Line Monitor Device of intelligent controlling device foundation gas mercury monitors and Elemental Mercury real-time concentration, control the delivery rate of screw(-type) feeder, the demercuration additive that screw(-type) feeder is exported is rendered in back-end ductwork with the flue gas in cycle flue.
Compared with prior art, the present invention has following beneficial effect:
Demercuration additive intelligence add-on system of the present invention detects the flue gas real-time traffic and Elemental Mercury real-time concentration that obtain in back-end ductwork by the continuous on-Line Monitor Device of gas mercury, the real-time content of Elemental Mercury is calculated by intelligent controlling device, and control screw(-type) feeder exports demercuration additive delivery rate according to the real-time content of this Elemental Mercury, demercuration additive is thrown in back-end ductwork with the flue gas in cycle flue, and, demercuration additive is ground into Powdered through breaker, be more conducive to fully react with Elemental Mercury, therefore, it is accurate that the present invention has demercuration additive addition, the feature that utilization ratio is high and demercuration is effective.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the fume emission schematic diagram of coal fired power plant in prior art;
Fig. 2 is structural representation of the present invention;
Fig. 3 is the schematic block circuit diagram of intelligent controlling device in the present invention;
In figure, 1-boiler furnace, 2-economizer, the continuous on-Line Monitor Device of 3-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.
Detailed description of the invention
As shown in Figure 2, demercuration additive intelligence add-on system of the present invention is applied to coal fired power plant, the flue gas that in coal fired power plant, boiler furnace 1 produces 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 back-end ductwork successively.Demercuration additive intelligence add-on system of the present invention comprises the continuous on-Line Monitor Device 3 of gas mercury, breaker 4, screw(-type) feeder 5, cycle flue 6, blower fan 7 and intelligent controlling device.Wherein, the exhaust opening of cycle flue 6 is located at economizer 2 exit in back-end ductwork, enter mouth is located at air preheater 8 import department in back-end ductwork, the continuous on-Line Monitor Device of gas mercury 3 adopts existing conventional model, can the concentration of real time on-line monitoring 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 obtained wherein 3/ s) and Elemental Mercury real-time concentration (μ g/m 3); Blower fan 7 is arranged in 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, intelligent controlling device comprises the motor M for driving screw(-type) feeder 5 to rotate and the controller for controlling screw(-type) feeder 5 rotating speed; Controller comprises multiplier X, function generator F (x) and PID controller, the flue gas flow signal output part of continuous on-Line Monitor Device 3 and elemental mercury concentration signal output part are electrically connected with gas mercury respectively for two inputs of multiplier, the output of multiplier is connected with the sp port electrical of PID controller by function generator, the pv port of PID controller and the tach signal output of motor M are electrically connected, and the output of PID controller and the job control end of motor M are electrically connected.Multiplier receives the flue gas real-time traffic signal (m that the continuous on-Line Monitor Device 3 of gas mercury exports 3/ s) and Elemental Mercury real-time concentration signal (μ g/m 3), calculate the real-time content (μ g/s) of Elemental Mercury in 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 show that after PID controller computing motor speed instruction is to control the rotating speed of motor M, motor M drives screw(-type) feeder 5 to rotate, and additive is added by the Elemental Mercury cont signal of flue gas.
The operation principle of the intelligent add-on system of demercuration additive of the present invention is as follows:
The flue gas that in coal fired power plant, boiler furnace 1 produces is via back-end ductwork, successively by economizer 2, air preheater 8, discharge from chimney 11 after electrostatic precipitator 9 and wet desulfuration tower 10, the flue gas of back-end ductwork is pumped into cycle flue 6 from entering mouth and is again discharged to back-end ductwork by exhaust opening by blower fan 7, to form flue gas stream in cycle flue 6, exhaust gas volumn in cycle flue 6 is controlled by blower fan 7, demercuration additive is broken into and Powderedly leaves in screw(-type) feeder 5 by breaker 4, be beneficial to demercuration additive spray into and then fully react with the Elemental Mercury in flue gas, the back-end ductwork flue gas real-time traffic that the continuous on-Line Monitor Device 3 of intelligent controlling device foundation gas mercury monitors and Elemental Mercury real-time concentration control the rotating speed of motor M, thus the control realized the delivery rate of screw(-type) feeder 5, the demercuration additive that screw(-type) feeder 5 is exported is rendered in back-end ductwork with the flue gas in cycle flue 6, the Elemental Mercury entered in the additive of back-end ductwork and flue gas reacts, make it to be converted into gaseous state bivalent mercury, part gaseous state bivalent mercury is adsorbed by flying dust and then removes in electrostatic precipitator 9, some gaseous state bivalent mercury removes at wet method fume desulfurizing system 10 thereafter, flue gas smoke-input tube 11 after wet method fume desulfurizing system 10 drains into air, greatly reduce the discharge of gas mercury.
The present invention does not limit to and above-mentioned detailed description of the invention; according to foregoing; according to ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; the present invention can also make the equivalent modifications of other various ways, replacement or change, all drops among protection scope of the present invention.

Claims (1)

1. the intelligence of the demercuration additive for a coal fired power plant add-on system, the flue gas that in described coal fired power plant, boiler furnace (1) produces is discharged from chimney (11) through back-end ductwork, economizer (2) is provided with successively in back-end ductwork, air preheater (8), electrostatic precipitator (9) and wet desulfuration tower (10), it is characterized in that: described intelligent add-on system comprises the continuous on-Line Monitor Device of gas mercury (3), breaker (4), screw(-type) feeder (5), cycle flue (6), blower fan (7) and intelligent controlling device, the exhaust opening of described cycle flue (6) is located at economizer (2) exit in back-end ductwork, enter mouth and be located at air preheater (8) import department in back-end ductwork, described blower fan (7) is arranged in 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 gas mercury (3) is arranged in back-end ductwork, the continuous on-Line Monitor Device of described gas mercury (3) and screw(-type) feeder (5) are electrically connected with the corresponding port of intelligent controlling device respectively,
The monitoring probe of the continuous on-Line Monitor Device of described gas mercury (3) is arranged on back-end ductwork and is arranged in pipeline section between economizer (2) and air preheater (8);
Described intelligent controlling device comprises the motor (M) for driving described screw(-type) feeder (5) to rotate and the controller for controlling described screw(-type) feeder (5) rotating speed; Described controller comprises multiplier, function generator and PID controller, the flue gas flow signal output part of continuous on-line monitoring system (3) and elemental mercury concentration signal output part are electrically connected with gas mercury respectively for two inputs of described multiplier, the output of described multiplier is connected with the sp port electrical of PID controller by function generator, the tach signal output of the pv port of PID controller and motor (M) is electrically connected, and the job control end of the output of PID controller and motor (M) is electrically connected.
CN201310065948.0A 2013-03-01 2013-03-01 Intelligent demercuration addition agent adding system for coal-fired power plant Active CN103170236B (en)

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Publication number Priority date Publication date Assignee Title
CN103423757B (en) * 2013-07-31 2016-12-28 华北电力大学(保定) A kind of device and method utilizing polrvinyl chloride and boiler fly ash to carry out flue gas demercuration
CN104536410B (en) * 2014-12-22 2018-05-15 山东应天节能环保科技有限公司 A kind of desulphurization denitration additive intelligent detection device
WO2016153046A1 (en) * 2015-03-26 2016-09-29 住友金属鉱山エンジニアリング株式会社 Heavy metal elimination assistance device for electrostatic precipitator
CN105444195B (en) * 2015-12-25 2018-11-30 中电投远达环保工程有限公司 Coal-fired flue-gas multi-pollutant cooperative processing method and its system

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