CN201223766Y

CN201223766Y - PLC automatic control waste gas treater

Info

Publication number: CN201223766Y
Application number: CNU200820040384XU
Authority: CN
Inventors: 徐全海
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-16
Filing date: 2008-07-16
Publication date: 2009-04-22
Anticipated expiration: 2018-07-16

Abstract

The utility model relates to a PLC automatically controlled waste gas treatment device for improving the waste gas treatment efficiency, which comprises an absorption reaction tank, an absorption reaction tube and an alkaline liquor storage tank. The bottom part of the absorption reaction tube for waste gas input is connected with the absorption reaction tank, and the alkaline liquor storage tank is communicated with the absorption reaction tank through a liquor supplementation electric valve; a plurality of nozzles are arranged in the absorption reaction tube, and each nozzle is connected with the absorption reaction tank through a circulation pump; the device also comprises a PLC and a pH value detector used for detecting the pH value of the liquor in the absorption reaction tank; when the device is operated, the PLC controls the opening of the circulation pump, and the waste gas which flows into the absorption reaction tube is mixed with the mist liquor sprayed from the nozzles and then enters into the absorption reaction tank; when the pH value of the liquor in the absorption reaction tank is detected by the PLC through the pH value detector and smaller than a first preset value, the PLC controls the liquor supplementation electric valve to be opened, and the PLC controls the liquor supplementation electric valve to be shut till the pH value is larger than a second preset value.

Description

PLC is the emission-control equipment of control automatically

Technical field

The utility model relates to a kind of PLC emission-control equipment of control automatically.

Background technology

In the prior art, common alkali solution absorbs processing to chloride flue gas, for example: Chinese patent literature notification number CN201015724Y discloses a kind of emission-control equipment, have one-level scrubbing tower, secondary turbulent tower and three grades of turbulent towers, one-level scrubbing tower and two, three grades of turbulent towers are equipped with heat exchanger respectively one, two, No. three, supply mains, cooling backwater house steward, discharge manifold in alkali lye house steward, water inlet pipe, the cooling; Respectively there are liquid film foam area in one-level scrubbing tower, secondary turbulent tower and three grades of turbulent towers, and harmful exhaust is purified through the film foam area of one-level scrubbing tower, secondary turbulent tower, three grades of turbulent towers successively.

Above-mentioned the deficiencies in the prior art part is: can not carry out automation control to waste gas treatment process, so the efficient of its exhaust-gas treatment is lower.

The utility model content

The technical problems to be solved in the utility model provides a kind of automatic emission-control equipment of controlling of PLC that is used to improve exhaust-gas treatment efficient.

In order to solve the problems of the technologies described above, the utility model provides a kind of PLC the emission-control equipment of control automatically, comprising: absorption reaction groove, absorption reaction pipe and alkali lye storage tank; The bottom that is used to import the absorption reaction pipe of waste gas links to each other with the absorption reaction groove, and the alkali lye storage tank is connected with the absorption reaction groove through the fluid infusion motor-driven valve; Be provided with 1-5 shower nozzle in the absorption reaction pipe, each shower nozzle links to each other with the alkali lye storage tank through circulating pump; Also comprise: PLC and the pH value detector that is used to detect solution pH value in the absorption reaction groove; PLC links to each other with described circulating pump, fluid infusion motor-driven valve and pH value detector; During use, PLC controls described circulating pump and opens, the waste gas in the absorption reaction pipe of flowing through with enter in the alkali lye storage tank after the vaporific solution that sprays in described shower nozzle mixes; When the pH value of solution in the absorption reaction groove that PLC records by the pH value detector was lower than first preset value, PLC control fluid infusion motor-driven valve was opened, and when pH value was higher than second preset value, PLC control fluid infusion motor-driven valve cut out.

In the technique scheme, be provided with the liquid level instrument in the described absorption reaction groove, the liquid level signal output of liquid level instrument links to each other with the liquid level signal input of PLC; When PLC control fluid infusion motor-driven valve was opened, if PLC prescribes a time limit to the liquid level amount by the solution height that the liquid level instrument records in the absorption reaction groove, PLC control fluid infusion motor-driven valve cut out.

In the technique scheme, the top of described absorption reaction groove is a turbulent tower; The top of turbulent tower is provided with exhaust outlet, and is provided with blower fan and waste gas outlet up to standard successively on the pipeline that this exhaust outlet links to each other; Blower fan links to each other with PLC.

In the technique scheme, the exhaust input tube road that links to each other with described absorption reaction pipe is provided with the waste gas detector that is used to detect exhaust gas concentration, the waste gas detector links to each other with PLC, when PLC records exhaust gas concentration greater than the 3rd preset value according to the waste gas detector, PLC controls the solution internal circulating load of described circulating pump increasing in the unit interval, controls the capacity of blower fan increasing in the unit interval simultaneously.

In the technique scheme, described turbulent tower comprises: the bubble-cap that sets gradually, dash to drench pipe and demister from bottom to top, dash and drench Guan Jingchong and drench motor-driven valve and link to each other with running water pipe; Described PLC with dash to drench motor-driven valve and link to each other, be used for regularly opening dashing and drench motor-driven valve, wash demister to adopt running water.

Technique scheme of the present utility model has the following advantages compared to existing technology: the emission-control equipment that (1) PLC of the present utility model controls automatically in use, PLC control circulating pump is opened, the waste gas in the absorption reaction pipe of flowing through with enter in the alkali lye storage tank after the vaporific solution that sprays in shower nozzle mixes; Simultaneously the PI value control fluid infusion motor-driven valve of solution opens or cuts out in the absorption reaction groove that records according to the pH value detector of PLC, to guarantee that pH value is in the ideal range of presetting (pH value is 7.5-10).So the utility model has been realized the automation control to waste gas treatment process, thereby can improve exhaust-gas treatment efficient.(2) in the emission-control equipment that PLC of the present utility model controls automatically, be provided with the liquid level instrument in the absorption reaction groove, PLC prevents that solution height is too high, and influences the function of the demist drying of the turbulent tower above the absorption reaction groove by the height of solution in detection of liquid level instrument and the control absorption reaction groove.(3) in the utility model, the turbulent tower of absorption reaction groove top is used to absorb the vaporific drop that rises in the absorption reaction groove, makes the humidity of the gas of sending from the exhaust outlet of absorption reaction groove satisfy national relevant regulations; Play the effect of quickening exhaust with the blower fan on the pipeline that this exhaust outlet links to each other.(4) in the utility model, PLC is according to the exhaust gas concentration in the waste gas detector detection exhaust input tube road, when this concentration is big, PLC control circulating pump and blower fan quicken operation, or open a plurality of circulating pumps and blower fan simultaneously, to increase solution internal circulating load and capacity respectively, with corresponding raising exhaust-gas treatment ability.(5) in the turbulent tower of the present utility model, the demister below is provided with to dash drenches pipe, is used for regularly opening dashing and drenches motor-driven valve, and adopt running water flushing demister, removes attachment and impurity on it, guarantees to remove fog effect.

Description of drawings

For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein

Fig. 1 is the PLC of the present utility model structural representation of the emission-control equipment of control automatically;

Fig. 2 is the PLC of the present utility model circuit block diagram of the control circuit of the emission-control equipment of control automatically.

The specific embodiment

(embodiment 1)

See Fig. 1-2, the PLC of present embodiment is the emission-control equipment of control automatically, comprising: absorption reaction groove 1, absorption reaction pipe 2, alkali lye storage tank 3, PLC and be used to detect the pH value detector 8 of solution pH value in the absorption reaction groove 1.

The bottom that is used to import the absorption reaction pipe 2 of waste gas links to each other with absorption reaction groove 1, and alkali lye storage tank 3 is connected with absorption reaction groove 1 through fluid infusion motor-driven valve 3-1; Be provided with 1-5 shower nozzle 2-1 in the absorption reaction pipe 2, each shower nozzle 2-1 links to each other with alkali lye storage tank 3 through circulating pump 2-2; PLC links to each other with described circulating pump 2-2, fluid infusion motor-driven valve 3-1 and pH value detector 8.

The top of described absorption reaction groove 1 is a turbulent tower 7; The top of turbulent tower 7 is provided with exhaust outlet 7-1, and is provided with blower fan 7-5 and waste gas outlet 7-6 up to standard successively on the pipeline that this exhaust outlet 7-1 links to each other; Blower fan 7-5 links to each other with PLC.

Described turbulent tower 7 comprises: the bubble-cap 7-4 that sets gradually, dash to drench pipe 7-3 and demister 7-2 from bottom to top, dash and drench pipe 7-3 and drench motor-driven valve 6 and link to each other with running water pipe through dashing; Described PLC with dash to drench motor-driven valve 6 and link to each other, be used for regularly opening dashing and drench motor-driven valve 6, wash demister 7-2 to adopt running water.

The exhaust input tube road 2-4 that links to each other with described absorption reaction pipe 2 is provided with the waste gas detector 2-3 that is used to detect exhaust gas concentration, and waste gas detector 2-3 links to each other with PLC.

During use, PLC controls described circulating pump 2-2 and opens, the waste gas in the absorption reaction pipe 2 of flowing through with enter in the alkali lye storage tank 3 after the vaporific solution that sprays in described shower nozzle 2-1 mixes; When the pH value of solution in the absorption reaction groove 1 that PLC records by pH value detector 8 was lower than first preset value 7.5, PLC control fluid infusion motor-driven valve 3-1 opened, and when pH value was higher than second preset value 8.5, PLC control fluid infusion motor-driven valve 3-1 closed.Among other embodiment, described first preset value can be that 8, the second preset values can be 9.

Be provided with liquid level instrument 1-1 in the described absorption reaction groove 1, when PLC control fluid infusion motor-driven valve 3-1 opens, if PLC records solution height in the absorption reaction groove 1 to liquid level amount upper limit when (liquid level surpasses bubble-cap 7-4 bottom) by liquid level instrument 1-1, PLC control fluid infusion motor-driven valve 3-1 closes.

When PLC greater than the 3rd preset value (for example records exhaust gas concentration according to waste gas detector 2-3, chloric acid mist concentration value is greater than 10.0mg/m3) time, PLC controls the solution internal circulating load of described circulating pump 2-2 increasing in the unit interval, controls the capacity of blower fan increasing in the unit interval simultaneously.

Also comprise the discharge opeing motor-driven valve 5 that links to each other with absorption reaction groove 1 by the road, described PLC links to each other with discharge opeing motor-driven valve 5, is used for regularly opening discharge opeing motor-driven valve 5, the lean solution in the absorption reaction groove 1 is discharged, and deliver to water treatment system and carry out water treatment.

Be provided with the second liquid level instrument 3-1 in the described alkali lye storage tank 3, described PLC links to each other with the second liquid level instrument 3-1, also is connected with touch-screen 9 and malfunction indicator lamp 11 on the PLC.

When the liquid level that records the alkaline solution in the alkali lye storage tank 3 by the second liquid level instrument 3-1 as PLC is lower than default low level value (promptly be lower than alkali lye storage tank 3 capacity 1/10), PLC exports corresponding alarm signal and shows to touch-screen 9, and control malfunction indicator lamp 11 is made corresponding warning indication, the liquid level of the alkaline solution in alkali lye storage tank 3 returns to 1/3 o'clock of alkali lye storage tank 3 capacity at least, PLC cancellation is corresponding reports to the police, thereby it is available to guarantee to have in the alkali lye storage tank 3 enough alkaline solutions.

Described circulating pump 2-2 links to each other with PLC through corresponding frequency converter respectively with blower fan 7-5; PLC is by the control of each frequency converter realization of control to described circulating pump 2-2 and blower fan 7-5 rotating speed; Each frequency converter is provided with frequency converter failure testing circuit 10, and each frequency converter failure testing circuit 10 links to each other with PLC; Also be connected with malfunction indicator lamp 11 on the PLC; When PLC recorded one of described frequency converter and breaks down by described frequency converter failure testing circuit 10, PLC exported corresponding alarm signal and shows to touch-screen 9, and control malfunction indicator lamp 11 is made corresponding warning indication.

During native system work, control and regulate the normal operation of circulating pump or quicken operation according to exhaust-gas treatment amount of measuring or flue gas concentration, circulating pump is set up No. 1 circulating pump and No. 2 circulating pumps respectively, has set up circulating pump simultaneously No. 3, with standby.When online exhaust-gas treatment or flue gas concentration surpass the value of setting up, quicken by No. 1 pump of PLC instruction, or No. 2 unlatching work or quicken operation, by the acceleration operation of circulating pump, increase the flow quantity of absorbent solution, maintenance Gas-Liquid Absorption convection equilibrium.When circulating pump quickens operation, control No. 1 blower fan simultaneously and quicken operation.

By frequency conversion control speed and speed governing, reach conventional operation speed and quicken the speed of service, by quickening the increase of the speed of service, reach the balance of flue gas treating capacity and absorption liquid flow.

For guaranteeing the frequency converter operate as normal, the PLC system sets up the frequency converter failure self-diagnostic function, and when frequency converter breaks down, the PLC system promptly can instruct and send corresponding warning, and informing needs the fault got rid of.

Claims

1, the emission-control equipment of the automatic control of a kind of PLC is characterized in that: comprising: absorption reaction groove (1), absorption reaction pipe (2) and alkali lye storage tank (3); The bottom that is used to import the absorption reaction pipe (2) of waste gas links to each other with absorption reaction groove (1), and alkali lye storage tank (3) is connected with absorption reaction groove (1) through fluid infusion motor-driven valve (3-1); Be provided with 1-5 shower nozzle (2-1) in the absorption reaction pipe (2), each shower nozzle (2-1) links to each other with alkali lye storage tank (3) through circulating pump (2-2); Also comprise: PLC and the pH value detector (8) that is used to detect the interior solution pH value of absorption reaction groove (1); PLC links to each other with described circulating pump (2-2), fluid infusion motor-driven valve (3-1) and pH value detector (8).

2, the emission-control equipment of the automatic control of PLC according to claim 1, it is characterized in that: be provided with liquid level instrument (1-1) in the described absorption reaction groove (1), the liquid level signal output of liquid level instrument (1-1) links to each other with the liquid level signal input of PLC.

3, the emission-control equipment of the automatic control of PLC according to claim 1 and 2, it is characterized in that: the top of described absorption reaction groove (1) is turbulent tower (7); The top of turbulent tower (7) is provided with exhaust outlet (7-1), and is provided with blower fan (7-5) and waste gas outlet up to standard (7-6) successively on the pipeline that this exhaust outlet (7-1) links to each other; Blower fan (7-5) links to each other with PLC.

4, the emission-control equipment of the automatic control of PLC according to claim 3, it is characterized in that: the exhaust input tube road (2-4) that links to each other with described absorption reaction pipe (2) is provided with the waste gas detector (2-3) that is used to detect exhaust gas concentration, and waste gas detector (2-3) links to each other with PLC.

5, the emission-control equipment of the automatic control of PLC according to claim 3, it is characterized in that: described turbulent tower (7) comprising: the bubble-cap that sets gradually (7-4), dash to drench pipe (7-3) and demister (7-2) from bottom to top, dash and drench pipe (7-3) and link to each other with running water pipe through dashing pouring motor-driven valve (6); Described PLC with dash to drench motor-driven valve (6) and link to each other.

6, the emission-control equipment of the automatic control of PLC according to claim 3, it is characterized in that: also comprise the discharge opeing motor-driven valve (5) that links to each other with absorption reaction groove (1) by the road, described PLC links to each other with discharge opeing motor-driven valve (5).

7, the emission-control equipment of the automatic control of PLC according to claim 3, it is characterized in that: be provided with the second liquid level instrument (3-1) in the described alkali lye storage tank (3), described PLC links to each other with the second liquid level instrument (3-1), also is connected with touch-screen (9) and malfunction indicator lamp (11) on the PLC.

8, the emission-control equipment of the automatic control of PLC according to claim 3 is characterized in that: described circulating pump (2-2) links to each other with PLC through corresponding frequency converter respectively with blower fan (7-5); Each frequency converter is provided with frequency converter failure testing circuit (10), and each frequency converter failure testing circuit (10) links to each other with PLC; Also be connected with malfunction indicator lamp (11) on the PLC.