CN214253023U

CN214253023U - Device for monitoring and controlling fly ash concentration of coal-fired power plant

Info

Publication number: CN214253023U
Application number: CN202120893655.1U
Authority: CN
Inventors: 王川; 王凯; 王彬; 何英杰
Original assignee: Shenzhen Kaiyun Intelligent Co ltd
Current assignee: Shenzhen Kaiyun Intelligent Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-09-21
Anticipated expiration: 2031-04-26

Abstract

A device for monitoring and controlling the fly ash concentration of a coal-fired power plant comprises a fan, a stabilized voltage power supply, a cylinder, an air purifier, a spraying device, a data transmission circuit and a fly ash concentration acquisition circuit; the rear connecting pipe of the cylinder is connected with an air inlet pipe of the air purifier; the lower end of the cylinder body is provided with a sewage discharge pipe, and the fan is arranged in front of one end of the cylinder body; the spraying equipment is arranged in the cylinder body, and the data transmission circuit, the fly ash concentration acquisition circuit and the stabilized voltage power supply are arranged in the element box and are respectively and electrically connected with the spraying equipment, the axial flow fan and the air purifier. This is novel has guaranteed flying dust treatment effect. This is novel still use by expansion, increases and is used for the buffer memory data and carries out the chip board that the edge calculated through the loaded degree of depth learning algorithm, and like this, the far end can master on-the-spot flying dust concentration data in real time, offers convenience for data acquisition and machine learning data analysis, reaches intelligent prediction and adds under control purpose, the assurance workman is healthy the prerequisite, has still reduced the filter core as far as and has blockked up the probability.

Description

Device for monitoring and controlling fly ash concentration of coal-fired power plant

Technical Field

The utility model relates to a monitoring control equipment technical field, especially a device that is used for coal fired power plant flying dust concentration monitoring and control.

Background

In coal-fired thermal power plants and the like, fly ash can affect the health of workers at the same time, so that fly ash purification devices can be installed at corresponding positions in existing thermal power plants. The existing fly ash purification device generally comprises an axial flow fan and an air purifier, wherein the axial flow fan generates negative pressure suction force to pump fly ash into an air filter for filtration during working, and then the air filter intercepts the fly ash and discharges relatively clean air to the atmosphere.

The existing fly ash purification device is not provided with an automatic detection control device, the work control mode of the fly ash purification device is controlled by manually operating a power switch, unnecessary electric energy waste can be caused when the fly ash is possibly not on site (such as a generator set is stopped) in the mode, and in addition, when the fly ash on site exceeds the standard, adverse effects can be caused to the health of workers if workers do not turn on a working power supply of the device. Moreover, because of structural limitation, the existing fly ash purification device cannot remotely transmit data to relevant management departments (such as environmental protection departments), and the relevant departments cannot actually master the situation of the concentration of the fly ash on site, so that measures cannot be further formulated based on the concentration of the fly ash (such as excessive standard exceeding of the concentration of the fly ash on site and representing that power generation equipment discharges problems, and the environmental protection departments can blame for rectifying and reforming a power plant if master the actual situation, and bring inconvenience to environmental protection personnel by relying on the environmental protection personnel to collect data on site). Finally, the existing fly ash purification device directly pumps fly ash into the air inlet end of the air purifier, and as the fly ash completely enters the air inlet end of the air purifier, when the amount of the fly ash is large and the working time of the air purifier is long, a large amount of fly ash easily blocks a filter element of the air purifier, so that the fly ash cannot work normally.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects that the existing fly ash purification device used in the coal-fired thermal power plant cannot automatically control the working state due to the structural limitation, the electric energy is wasted and the health of workers cannot be effectively ensured, and related departments can acquire fly ash concentration data only on site, which brings inconvenience to workers and easily causes the blockage of a filter element of an air purifier due to the fact that the fly ash cannot be subjected to pre-treatment, the utility model provides a fly ash purification device which can be conveniently installed at any required position, can acquire the fly ash concentration data on site in real time through related circuits in application and remotely transmit the data to a mobile phone or a PC (personal computer) of related managers, and the remote manager can master the fly ash concentration data on site in real time, brings convenience to the acquisition of data of the related personnel, and when the fly ash concentration is lower than a set threshold value, the whole device does not work and works when the fly ash concentration is higher than the threshold value, thereby realizing the purpose of intelligent control, still realized energy-conservation and guaranteed that the workshop staff is healthy, carried out leading processing to the flying dust that gets into air purifier through spray equipment, reduced a device that is used for coal fired power plant flying dust concentration monitoring and control of filter core jam probability as far as.

The utility model provides a technical scheme that its technical problem adopted is:

a device for monitoring and controlling the fly ash concentration of a coal-fired power plant comprises a fan, a stabilized voltage power supply, a cylinder and an air purifier, and is characterized by also comprising a spraying device, a data transmission circuit and a fly ash concentration acquisition circuit; one end of the cylinder is of an open structure, the other end of the cylinder is of a closed structure, the other end of the cylinder is provided with a rear connecting pipe, and the rear connecting pipe is connected with an air inlet pipe of the air purifier; the two sides of the inner lower end of the barrel are higher than the middle height, the lower end of the barrel is provided with a blow-off pipe, and the fan is arranged in front of one end of the barrel; the spraying equipment is arranged at the upper end in the cylinder, and the data transmission circuit, the fly ash concentration acquisition circuit and the stabilized voltage power supply are arranged in the element box; the signal output end of the fly ash concentration acquisition circuit is electrically connected with the signal input end of the data transmission circuit, and the two control power supply output ends of the fly ash concentration acquisition circuit are respectively and electrically connected with the power supply input ends of the spraying equipment, the axial flow fan and the air purifier.

Further, the stabilized voltage supply is an alternating current to direct current switching power supply module.

Furthermore, the spraying equipment comprises an electromagnetic valve, a spraying pipe and a plurality of spraying heads, the water inlet pipes of the plurality of spraying heads are respectively arranged at the lower end of the spraying pipe at intervals, the lower part of the spraying pipe is positioned at the upper end in the cylinder body, the spraying pipe is connected with one end of the electromagnetic valve, and the other end of the electromagnetic valve is connected with a tap water pipe.

Furthermore, the data transmission circuit comprises a single chip microcomputer module and a GPRS module, and two ends of the power input of the single chip microcomputer module and the two ends of the power input of the GPRS module are respectively and electrically connected together.

Further, the fly ash concentration acquisition circuit comprises a photodiode, a phototriode, an NPN triode, an adjustable resistor, a relay and a power switch, wherein the photodiode, the NPN triode, the phototriode, the adjustable resistor, the relay and the power switch are electrically connected; one end of a first resistor is connected with a positive power input end of a first relay, one end of a third resistor, the other end of the first resistor is connected with the positive electrode of a photodiode, the negative electrode of the photodiode is connected with an emitting electrode of the phototriode, an emitting electrode of an NPN triode and a negative power input end of a second relay, a normally closed contact end of the first relay is connected with the positive power input end of the second relay, a collector of the phototriode is connected with one end of an adjustable resistor, one end of the second resistor and the other end of the third resistor, the other end of the adjustable resistor is connected with a base electrode of the NPN triode, the collector of the NPN triode is connected with the negative power input end of the relay, and two ends of a power switch are respectively connected with an NPN collector of the triode and the negative power input end of the first relay in series.

The utility model has the advantages that: this novel ability convenient installation is in the position department of any needs, based on current ripe data transmission to and oscillogram demonstration APP software technique, as the basis that flying dust concentration data transmission and receipt show. During operation, the concentration data of on-site flying dust can be collected in real time by the flying dust concentration collecting circuit, when the flying dust data exceeds a set threshold value, the axial flow fan, the air purifier and the electromagnetic valve can be automatically electrified to work, thus, the axial flow fan can automatically pump air containing flying dust into the air purifier for treatment, and the flying dust entering the air purifier is treated by spraying in advance, so that the probability that the flying dust enters a filter element in the air purifier is reduced, the intelligent control purpose is achieved, and the probability of filter element blockage is reduced as far as possible on the premise of ensuring the health of workers in a production workshop. This is novel in, data transmission circuit can go out on-the-spot dynamic change's flying dust concentration data through wireless mobile network transmission, and the far-end managers passes through the oscillogram demonstration APP of preassembleing in cell-phone or PC etc. and uses, can master on-the-spot flying dust concentration data in real time, has brought the facility for relevant personnel data acquisition. Based on the above, this is novel has good application prospect.

Drawings

The invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a circuit diagram of the present invention.

Detailed Description

Fig. 1 shows a device for monitoring and controlling the fly ash concentration of a coal-fired power plant, which comprises an axial flow fan 1, a stabilized voltage power supply 2, a cylinder 3, an air purifier (not shown in the figure), a spraying device, a data transmission circuit 4 and a fly ash concentration acquisition circuit 5; the left front end of the cylinder 3 is of an open structure, the right rear end of the cylinder 3 is of a closed structure, four supporting legs 31 are welded around the lower end of the cylinder 3, a rear connecting pipe 32 communicated with the inside of the cylinder is welded outside the middle part of the rear end of the cylinder 3, and the rear connecting pipe 32 is connected with an air inlet pipe of an air purifier through a flange plate and a screw nut; the two sides of the inner lower end of the cylinder 3 are higher than the middle height, the middle part of the lower end of the cylinder 3 is vertically welded with a discharge pipe 33 communicated with the inside of the cylinder, the discharge pipe 33 is directly connected with a wastewater treatment tank positioned in a production area through a pipeline, the axial flow fan 1 is arranged in front of the left end of the cylinder 3 through a screw nut, and a protective mesh enclosure 34 is arranged in front of a frame of the axial flow fan at the left end of the cylinder 3 (preventing workers from touching fan blades to cause injury); the spraying equipment is arranged at the upper end in the cylinder, the data transmission circuit 4, the fly ash concentration acquisition circuit 5 and the stabilized voltage power supply 2 are arranged on a circuit board in the element box 6, and the element box 6 is arranged at the front and outer upper end of the cylinder 3.

As shown in fig. 1, the spraying equipment comprises an electromagnetic valve 71, a spraying pipe 72 and spraying heads 73, wherein the spraying heads 73 are provided with five spraying heads, the left end and the right end of the spraying pipe 72 are of a closed structure, the upper end of the spraying pipe 72 is provided with a connecting pipe 74 communicated with the inside of the spraying pipe, the water inlet pipes of the five spraying heads 73 are respectively arranged at the lower end of the spraying pipe 72 at certain intervals, the water inlet pipe of the spraying head 73 is communicated with the inside of the spraying pipe 72, the middle part of the cylinder body is provided with an opening, the outer side of the middle part of the connecting pipe 74 is welded in the opening, the spraying pipe 72 is transversely positioned in the middle part of the inner upper end of the cylinder body 3, the connecting pipe 74 is positioned at the outer part of the cylinder body and is in threaded connection with one end of the electromagnetic valve 71, a front water pipe 75 is arranged in the other end of the electromagnetic valve 71 through threads, and the front water pipe 75 is connected with a tap water pipe through a pipeline.

As shown in fig. 1 and 2, the axial flow fan M1 is an axial flow fan with 380V ac working voltage and 3KW power; the stabilized voltage supply A1 is a finished product of a 220V/12V/1KW type alternating current 220V-to-direct current 12V switching power supply module; the air purifier M2 has working voltage of 380V and power of 2KW, and has filter element inside to filter the dust-containing air and discharge it harmlessly. The data transmission circuit comprises a singlechip module A2 and a GPRS module A3 which are connected through circuit board wiring, two

ends

1 and 2 of power input of the singlechip module A2 and the GPRS module A3 are respectively connected together, and a signal output end of the singlechip module A2 is connected with a signal input end of the GPRS module A3 through an RS485 data line; the model of a master control chip of the singlechip module A2 is STC12C5A60S2, 1 analog signal access end is arranged on a finished product A2 of the singlechip module, an RS485 data output port is arranged on a finished product A2 of the singlechip module, and the input dynamic change analog voltage signal data can be converted into digital signals to be output to a GPRS module A3; the GPRS module finished product A3 is ZLAN8100 in model, and an RS485 data input port is arranged on the GPRS module finished product A3, so that input digital signals can be sent out through a wireless mobile network. The fly ash concentration acquisition circuit comprises a photodiode VD, a phototriode Q, an NPN triode Q1, an adjustable resistor RP, resistors R1, R2 and R3, relays K1 and K2, a power switch S (which toggles the power switch), wherein the photodiode, the NPN triode, the phototriode, the adjustable resistor, the relay and the power switch are connected through circuit board wiring, two openings are transversely formed in the middle of the front end of the element box 6, and a light emitting surface of the photodiode VL (81) and a light receiving surface of the phototriode Q (82) are distributed on the outer side ends of the two openings in a straight line face-to-face mode (at an interval of 3 cm); one end of a first resistor R1 is connected with a power input end of a positive pole of a first relay K1 and a control power input end, one end of a third resistor R3 is connected, the other end of the first resistor R1 is connected with a positive pole of a photodiode VD, a negative pole of the photodiode VD is connected with an emitting pole of a phototriode Q, an emitting pole of an NPN triode Q1 and a negative pole of a second relay K2, a normally closed contact end of the first relay K2 is connected with a power input end of a positive pole of the second relay K2, a collector of the phototriode Q is connected with one end of an adjustable resistor RP, one end of the second resistor R2 and the other end of the third resistor R3, the other end of the adjustable resistor RP is connected with a base of the triode Q1, a collector of the NPN triode Q1 is connected with the power input end of the negative pole of the relay K1, a power switch S (an operating handle is positioned outside a front-end switch of a component box or the power switch is separately installed in a shell, convenient for workers to operate) are respectively connected with the collector of the NPN triode Q1 and the negative power supply input end of the first relay K1.

As shown in fig. 1 and 2,

pins

1 and 2 of a power input end of a regulated power supply a1 and two poles of an alternating current 220V power supply are respectively connected through leads, pins 3 and 4 of a power output end of a regulated power supply a1 and

pins

1 and 2 of a single chip module a2 at two ends of a power input of a data transmission circuit and

pins

1 and 2 of a single chip module a2 at two ends of a power input of a fly ash concentration acquisition circuit are respectively connected through leads; the other end of a signal output end resistor R2 of the fly ash concentration acquisition circuit is connected with the 3 pins of a signal input end singlechip module A2 of a data transmission circuit through a lead, the normally closed contact ends of a relay K1 and an NPN triode Q1 emitter of two control power output ends of the fly ash concentration acquisition circuit, the three normally open contact ends of the relay K2, the two input ends of a DC power supply of an electromagnetic valve of the spraying equipment, the power input ends of an axial flow fan M1 and an air purifier M2 are respectively connected through leads, and the 380V alternating current power supply and the three input ends of the control power supply of the relay K2 of the fly ash concentration acquisition circuit are respectively connected through leads.

As shown in figures 1 and 2, the novel fly ash concentration data transmission and receiving display device can be conveniently installed at any required position, and based on the existing mature data transmission and waveform diagram display APP software technology, the novel fly ash concentration data transmission and receiving display device is used as a basis. When the fly ash concentration acquisition circuit works, after a 220V alternating current power supply enters

pins

1 and 2 of a stabilized voltage supply A1, a stabilized voltage supply A1 outputs a stable 12V direct current power supply under the action of an internal circuit of the stabilized voltage supply A1, and the power supply enters power input ends of a data transmission circuit and a fly ash concentration acquisition circuit, so that the data transmission circuit and the fly ash concentration acquisition circuit are in an electrified working state. After the fly ash concentration acquisition circuit is electrified to work, the photodiode VD (a resistor R1 has the functions of voltage reduction and current limitation) is electrified to emit an infrared light beam to irradiate on the light receiving surface of the phototriode Q, and then, the emitter of the phototriode Q outputs a high-level signal to enter an adjustable resistor RP and one end of a resistor R2 (the resistor R3 is a peripheral element of the phototriode Q and plays the functions of voltage reduction and current limitation). In practical situations, when fly ash exists on site, the fly ash is located between the photodiode VD and the phototriode Q before entering the component box, and the fly ash blocks infrared light emitted by the photodiode VD, so that the more the fly ash is, the lower the light receiving surface of the phototriode Q receives the light of the photodiode VD, the higher the internal resistance, the lower the signal voltage output by the emitter is, and the less the fly ash is, the more the light receiving surface of the phototriode Q receives the light of the photodiode VD, the lower the internal resistance, the higher the signal voltage output by the emitter is. If the fly ash on site is relatively few in concentration and does not exceed the standard, the high level output by the emitter of the phototriode Q is subjected to voltage reduction and current limitation by the adjustable resistor RP, the base voltage entering the NPN triode Q1 is higher than 0.7V, then the NPN triode Q1 is conducted with the collector and outputs the low level to enter the negative power input end of the relay K1, the relay K1 is electrified to attract the control power input end and the normally closed contact end of the relay to be open, and the electromagnetic valve DC, the air purifier M2 and the axial flow fan M1 cannot be electrified to work. In practical situations, if the concentration of the fly ash on site exceeds the standard, the high level output by the emitter of the phototriode Q is reduced by the adjustable resistor RP and limited by current, then the base voltage entering the NPN triode Q1 is lower than 0.7V, then the collector of the NPN triode Q1 is cut off, the low level output is stopped, the base voltage enters the negative power input end of the relay K1, the relay K1 is not electrified, the control power input end and the normally closed contact end are not closed, and then the relay K2 is electrified, and the control power input end and the normally open contact end are closed. Because the normally closed contact end of the relay K1, the emitter of the NPN triode Q1 and the input end of the DC power supply of the electromagnetic valve of the spraying equipment are respectively connected, the three normally open contact ends of the relay K2 and the input end of the power supply of the axial flow fan M1 and the input end of the power supply of the air purifier M2 are respectively connected through leads, and the 380V AC power supply and the input end of the control power supply of the relay K2 are connected through leads, at the moment, the electromagnetic valve DC can be used as an electric machine to open the inner valve core of the electromagnetic valve, the air purifier M2 and the axial flow fan M1 can be electrified and operated at the same time, so the axial flow fan M1 generates negative pressure suction force to suck the fly ash in a production area into the cylinder 3 and input the fly ash into the air inlet end of the air purifier M2 through the rear connecting pipe 32, and after the air purifier M2 is electrified and operated, the fly ash in the air is filtered by the filter element and then is discharged to the atmosphere in a harmless way. After the electromagnetic valve DC is electrified and the inner valve core is opened, external tap water can be sprayed out from spray holes under five spray heads 73 (the spray heads have the same structures as those of agricultural sprayers) in a mist mode, so that the air containing fly ash entering the cylinder can be humidified by the mist water mist, the fly ash falls into the lower end of the cylinder after absorbing the water mist, and the fly ash is discharged into a sewage tank of a production workshop through a discharge pipe 33 to be subjected to harmless treatment. As the fly ash entering the air purifier M2 is sprayed in advance, the probability of the fly ash entering a filter element in the air purifier is reduced, thus achieving the purpose of intelligent control and reducing the probability of filter element blockage as far as possible on the premise of ensuring the health of workers in a production workshop.

As shown in fig. 1 and 2, when the fly ash concentration acquisition circuit is powered on to work, a dynamically changing high level signal output by a Q emitter of a phototriode is subjected to voltage reduction and current limitation by a resistor R2 and enters a pin 3 of a signal input end of a singlechip module a2, the larger the field fly ash concentration is, the lower the signal voltage is, and the higher the signal voltage is, analog quantity voltage data is subjected to analog-to-digital conversion by the singlechip module a2 (analog quantity voltage signals are converted into digital signals) and then output to a signal input end of a GPRS module A3, and the GPRS module A3 transmits the digital signals to internet equipment (smart phones, PCs and the like) of remote management personnel through a wireless mobile network. The mobile phone or the PC connected with the GPRS module finished product can convert dynamically changed digital signals into a waveform diagram for display through the mobile phone or the PC screen, and the manager can monitor the change of the waveform diagram in real time (the larger the field flying ash concentration is, the higher the waveform diagram displayed by the mobile phone or the PC application is, the lower the field flying ash concentration is, the lower the waveform diagram displayed by the mobile phone or the PC application is); the remote management personnel can intuitively master the size of the field fly ash through the height change of the oscillogram displayed by the application interface, convenience is brought to relevant personnel for collecting data, and the relevant personnel can take further measures according to the size of the fly ash concentration (for example, the field fly ash concentration exceeds the standard excessively, which represents that the power generation equipment discharges problems, and the environmental protection department can blame for the power plant to rectify and modify if the practical situation is mastered). In this is novel, the staff still can directly close switch S as required (initial state switch S opens inside contact closure), like this, no matter on-the-spot fly ash volume has many little 12V power negative poles and can not get into relay K1 negative pole power input end, relay K1 loses the electricity and no longer attracts its control power input end of actuation and normally closed contact end closure, and then solenoid valve DC, air purifier and axial fan work of getting electric, handle the field air (under this kind of mode, on-the-spot fly ash concentration is extremely low, use when being applied to the muddy taking a breath of field air basically, keep workshop air convection, the good region of workshop air convection generally does not adopt, reach and save the electric energy purpose). The specific installation position of this novel component box can be installed in the regional of producing the fly ash most easily as required to reach better detection control effect. The novel device is used in an expanded mode, so that the fly ash in the flue gas of the coal-fired power plant can be removed, and the fly ash concentration at the outlet of the coal-fired power plant can be predicted and controlled in an ultra-short period based on an AI (artificial intelligence) algorithm through the accumulated fly ash generation time period and the fly ash amount of the coal-fired power plant; however, the method based on deep learning has high accuracy but high calculation power requirement, and the difficulty of migration and deployment in different control systems is high, the control system can obtain and store long-term historical time sequences of the coal-fired power plant outlet fly ash and the associated indexes in the central control system (control system) through the fly ash generation data acquired by the method, and the central control system carries on the deep learning technology based on evolutionary algorithm optimization to predict the time sequences in real time so as to meet the corresponding calculation power requirement; in addition, the novel external scheme can be adopted, the system can be quickly butted with different central control systems through standard interface protocols, and complex environment configuration work is not needed, so that rapid migration and deployment can be realized, and a good application effect is achieved.

Fig. 1, 2 show, in this novel practical application, the technical staff adjusts adjustable resistance RP's resistance value as required, thereby can set for the minimum threshold value that the regional fly ash of production detected and handled, during the regulation, when the scene is in the highest flying ash concentration that allows, the technical staff adjusts adjustable resistance RP's resistance value on the left or right side, just adjust relay K1 get electric actuation after then adjust adjustable resistance RP's resistance value a little more, relay K1 loses the electricity, when follow-up scene has the fly ash (also the cleanliness factor that has surpassed the air needs), relay K1 will get electric actuation, and then solenoid valve DC, air purifier and axial fan get electric work, handle the scene air. In the circuit, the resistances of the resistors R1, R2, R3 and R3 are 100K, 100 omega and 1.8K respectively; the model of the NPN triode Q1 is 9013; the specification of the adjustable resistor RP is 4.7M; relays K1, K2 are DC12V relays; the electromagnetic valve DC is a 12V and 2W normally closed valve core electromagnetic valve; photodiode VL model 5 GLB; the phototransistor Q is model 3DU 5C.

The basic principles and essential features of the invention and the advantages of the invention have been shown and described above, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but rather can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for monitoring and controlling the fly ash concentration of a coal-fired power plant comprises a fan, a stabilized voltage power supply, a cylinder and an air purifier, and is characterized by also comprising a spraying device, a data transmission circuit and a fly ash concentration acquisition circuit; one end of the cylinder is of an open structure, the other end of the cylinder is of a closed structure, the other end of the cylinder is provided with a rear connecting pipe, and the rear connecting pipe is connected with an air inlet pipe of the air purifier; the two sides of the inner lower end of the barrel are higher than the middle height, the lower end of the barrel is provided with a blow-off pipe, and the fan is arranged in front of one end of the barrel; the spraying equipment is arranged at the upper end in the cylinder, and the data transmission circuit, the fly ash concentration acquisition circuit and the stabilized voltage power supply are arranged in the element box; the signal output end of the fly ash concentration acquisition circuit is electrically connected with the signal input end of the data transmission circuit, and the two control power supply output ends of the fly ash concentration acquisition circuit are respectively and electrically connected with the power supply input ends of the spraying equipment, the axial flow fan and the air purifier.

2. The device of claim 1, wherein the regulated power supply is an ac to dc switching power supply module.

3. The device for monitoring and controlling the fly ash concentration of a coal-fired power plant according to claim 1, wherein the spraying equipment comprises a plurality of electromagnetic valves, spraying pipes and spraying heads, water inlet pipes of the plurality of spraying heads are respectively arranged at the lower ends of the spraying pipes at intervals, the lower parts of the spraying pipes are arranged at the upper ends in the cylinder body, the spraying pipes are connected with one ends of the electromagnetic valves, and the other ends of the electromagnetic valves are connected with tap water pipes.

4. The device for monitoring and controlling the fly ash concentration of a coal-fired power plant according to claim 1, wherein the data transmission circuit comprises a single chip microcomputer module and a GPRS module, and two ends of the power input of the single chip microcomputer module and the two ends of the power input of the GPRS module are respectively and electrically connected together.

5. The device for monitoring and controlling the fly ash concentration of a coal-fired power plant according to claim 1, wherein the fly ash concentration acquisition circuit comprises a photodiode, a phototriode, an NPN triode, an adjustable resistor, a relay and a power switch, and the photodiode, the NPN triode, the phototriode, the adjustable resistor, the relay and the power switch are electrically connected; one end of a first resistor is connected with a positive power input end of a first relay, one end of a third resistor, the other end of the first resistor is connected with the positive electrode of a photodiode, the negative electrode of the photodiode is connected with an emitting electrode of the phototriode, an emitting electrode of an NPN triode and a negative power input end of a second relay, a normally closed contact end of the first relay is connected with the positive power input end of the second relay, a collector of the phototriode is connected with one end of an adjustable resistor, one end of the second resistor and the other end of the third resistor, the other end of the adjustable resistor is connected with a base electrode of the NPN triode, the collector of the NPN triode is connected with the negative power input end of the relay, and two ends of a power switch are respectively connected with an NPN collector of the triode and the negative power input end of the first relay in series.