CN204746089U - Flue gas desulfurization control system of thermal power plant based on PLC - Google Patents
Flue gas desulfurization control system of thermal power plant based on PLC Download PDFInfo
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- CN204746089U CN204746089U CN201520545608.2U CN201520545608U CN204746089U CN 204746089 U CN204746089 U CN 204746089U CN 201520545608 U CN201520545608 U CN 201520545608U CN 204746089 U CN204746089 U CN 204746089U
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Abstract
The utility model discloses a flue gas desulfurization control system of thermal power plant based on PLC, its characterized in that: including PLC controller and connected host computer, the host computer is connected with colored CRT monitor, and the host computer is connected with colored CRT monitor and UPS module, and the PLC controller is connected with control circuit, and control circuit and actuating mechanism are connected, and actuating mechanism and desulfurization system are connected, and desulfurization system passes through signal detection circuit and is connected with the PLC controller input end, desulfurization system includes booster fan and connected flue gas heat exchanger, and flue gas heat exchanger is connected with the absorption tower, and absorption tower middle part is connected with slurry tank through the pipeline, and one end is passed through the pipeline and is connected with the auto -oxidation fan bottom the absorption tower, and the other end passes through the gypsum drain pump and is connected with the dewatering system bottom the absorption tower. The utility model discloses multiple functional, control is simple, convenient to use, interference killing feature are strong, the good reliability, the desulfurization is efficient, the economic performance good.
Description
Technical field
The utility model relates to energy-conserving and emission-cutting technology field, especially relates to a kind of flue gas desulphurization control system based on PLC.
Background technology
Coal fire discharged sulfur dioxide also constantly increases, and causes China's acid rain and sulfur dioxide pollution to be on the rise.In order to realize the emission reduction targets of SO2, country has formulated a series of environmental practice.The design of current domestic flue gas desulfurization technique equipment, manufacture, installment and debugging level there has been and significantly improve, and build, put into operation large quantities of Large-scale machine set fired power generating unit flue gas desulphurization system.But it is reported, the thermal power plant of putting into operation at present all also also exists much such or such technical problem, wherein Thermal Automation Input Level is not high is one of them important technological problems, as inaccurate in measured, system automatic switching is not gone up, system fading margin poor quality etc., cause the desulphurization system of some power plant to occur operation troubles is many, can not run with generating set Complete Synchronization or run in desulfuration efficiency do not reach the problems such as design load or system operation cost are high.For whole flue gas desulphurization system, as monitoring, controlling that the control system that desulphurization system is run is important part, it should ensure the normal work of desulphurization system and the security of system of unusual service condition, coordinates mutually again with unit control system, ensures the safe operation of boiler.
Although control system adopts DCS automaticity greatly to improve, but the monitoring total due to desulfurizing technology system is counted (being generally 600 ~ 1000 points) far below the economic scale (being generally 5000 ~ 10000 points) of DCS system that can meet unit control, cause control system cost higher, economy declines.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, a kind of flue gas desulphurization control system based on PLC is provided, the utility model adopts programmable controller PLC as main control system, desulphurization control is included in full factory aid networks Centralized Monitoring, both ensure reliability, and significantly can reduce system cost again.The features such as it is multiple functional, it is simple, easy to use to control, antijamming capability is strong, good reliability, volume are little, lightweight, power consumptive province, reduce cost of labor, improve the efficiency of desulfurization, economic performance is good.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of flue gas desulphurization control system based on PLC, it is characterized in that: comprise PLC and with the host computer of PLC by RS232/485 model calling, described host computer is connected with colorCRT, described host computer and colorCRT input and UPS model calling, described PLC output is connected with control circuit, described control circuit output is connected with executing agency, described executing agency is connected with desulphurization system, described desulphurization system is connected with PLC input by signal deteching circuit, the flue gas heat exchanger that described desulphurization system comprises booster fan and is connected with booster fan output, described flue gas heat exchanger output is connected with absorption tower, be connected with slurry tank by pipeline in the middle part of described absorption tower, described absorption tower bottom end is connected with autoxidation blower fan by pipeline, and bottom described absorption tower, the other end is connected with dewatering system by gypsum draining pump.
Above-mentioned a kind of flue gas desulphurization control system based on PLC, is characterized in that: described PLC adopts Siemens SEMATICS7-300 Programmable Logic Controller.
Above-mentioned a kind of flue gas desulphurization control system based on PLC, is characterized in that: described EMATICS7-300 Programmable Logic Controller comprises CPU module, AI module, AO module, DI module and DO module.
Above-mentioned a kind of flue gas desulphurization control system based on PLC, is characterized in that: described host computer adopts and grinds magnificent IPC-6102 industrial control computer.
Above-mentioned a kind of flue gas desulphurization control system based on PLC, is characterized in that: described signal deteching circuit is the sensing detection circuit based on slurry pH value sensor, dust concentration sensor, flue gas pressures sensor, flue-gas temperature sensor.
Above-mentioned a kind of flue gas desulphurization control system based on PLC, is characterized in that: described UPS module front end is electrically connected with city by wave filter, an isolating transformer successively, and described isolating transformer is also connected with PLC by another wave filter.
The utility model compared with prior art has the following advantages:
The utility model adopts programmable controller PLC as main control system, desulphurization control is included in full factory aid networks Centralized Monitoring, both ensures reliability, and significantly can reduce system cost again.The features such as it is multiple functional, it is simple, easy to use to control, antijamming capability is strong, good reliability, volume are little, lightweight, power consumptive province, reduce cost of labor, improve the efficiency of desulfurization, economic performance is good.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is flue gas desulfurization control system overall control architecture block diagram of the present utility model;
Fig. 2 is flue gas desulfurization control system process chart of the present utility model;
Fig. 3 is flue gas desulfurization control system power unit schematic diagram of the present utility model.
Detailed description of the invention
As shown in Figure 1, a kind of flue gas desulphurization control system based on PLC, it is characterized in that: the host computer 6 comprising PLC 1 and be connected by RS232/485 module 7 with PLC 1, described host computer 6 is connected with colorCRT 5, described host computer 6 is connected with UPS module 4 with colorCRT 5 input, described PLC 1 output is connected with control circuit 8, described control circuit 8 output is connected with executing agency 9, described executing agency 9 is connected with desulphurization system 3, described desulphurization system 3 is connected with PLC 1 input by signal deteching circuit 2, the flue gas heat exchanger that described desulphurization system 3 comprises booster fan and is connected with booster fan output, described flue gas heat exchanger output is connected with absorption tower, be connected with slurry tank by pipeline in the middle part of described absorption tower, described absorption tower bottom end is connected with autoxidation blower fan by pipeline, and bottom described absorption tower, the other end is connected with dewatering system by gypsum draining pump.
In the present embodiment, described PLC 1 adopts Siemens SEMATICS7-300 Programmable Logic Controller.Described EMATICS7-300 Programmable Logic Controller comprises CPU module, AI module, AO module, DI module and DO module.
In the present embodiment, described host computer 6 adopts and grinds magnificent IPC-6102 industrial control computer.
In the present embodiment, described signal deteching circuit 2 is the sensing detection circuit based on slurry pH value sensor, dust concentration sensor, flue gas pressures sensor, flue-gas temperature sensor.
In the present embodiment, described UPS module 4 front end is electrically connected with city by wave filter, an isolating transformer successively, and described isolating transformer is also connected with PLC 1 by another wave filter.
As shown in Figure 1, system, using " grinding China " IPC-6102 industrial control computer (PC) as system host computer, is equipped with PHILIPS21 cun of color monitor and keyboard etc.; Siemens SEMATICS7-300 Programmable Logic Controller is as system slave computer.PC is communicated with one another by RS232/485 bus and PLC, is interknited.For not affecting the operation of Monitor Computer Control System when guaranteeing to have a power failure suddenly, system configuration has UPS.PLC is used for the collection of field device parameters and signal, computing, regulation output, each equipment of control run; Host computer is mainly used in Process operating parameters setting, system fading margin setting parameter, real time execution curve detection and device failure alert etc., realizes automatic management and the control of desulphurization control process.
As shown in Figure 2, the typical process flow of limestone/gypsum wet flue gas desulphurization is: boiler smoke, after deduster dedusting, sends into desulphurization system by air-introduced machine, and flue gas enters by after booster fan supercharging by inlet flue duct, through gas-gas heat exchanger (GGH) cooling, enter absorption tower.In absorption tower, flue gas flows from bottom to top, and lime stone slurry washs flue gas from top to bottom, bottom absorption tower, blasts air and is oxidized, and the gypsum of generation is by gypsum slurries pumping people dewatering system.
According to the requirement of control system, the key data that desulphurization system needs gather is: slurry pH value, dust concentration, flue gas pressures, flue-gas temperature etc.Therefore signal deteching circuit 2 of the present utility model selects slurry pH value sensor, dust concentration sensor, flue gas pressures sensor, flue-gas temperature sensor sensor to detect the functional parameter of desulphurization system.
Slurry pH value is by pH sensor measurement, and its operation principle is: in certain scope, being in proportion of the concentration of acid-base solution and its electrical conductivity.Thus, as long as the size measuring electrical conductivity of solution becomes the height can learning acid base concentration.When detected solution flows into special conductance cell, if ignore electrode polarization and distribution capacity, then can be equivalent to a pure resistance.When there being constant voltage alternating current to flow through, its output current and electrical conductivity linear, and acid, the proportional relation of alkali concn in electrical conductivity and solution.As long as therefore measure solution electric current, just can calculate the concentration of acid, alkali, salt, namely calculate the pH value of solution.PH sensor exports 4 ~ 20mA signal, after A/D conversion equipment, send PLC.
Dust concentration major meters device is flue dust monitor, flue dust monitor product utilizes light scattering or refraction principle work, and light is by during containing the flue gas of flue dust, and light intensity weakens because of the absorption of flue dust and scattering process, measure the change of light intensity before and after scattering, can quantitative response dust concentration.
The measurement of flue-gas temperature will by dissimilar temperature sensor, present industrial widely used be thermal resistance and the thermocouple of PT1OO, according to the restriction of measuring tempeature scope and installation requirement, have polytype available.In the design, PT100 temperature measurement component selected by temperature sensor, and temperature signal converts the voltage of 0 ~ 5V to by PT100 and corresponding conditioning module, sends into A/D conversion equipment.
Pressure measurement sensor also has a lot of form, such as resistance-type, inductance pressure transducer, and condenser type, pressure point formula pressure sensor etc., according to the difference of environment for use, dielectric behavior, pressure limit etc., consider and selected.The present embodiment selects inductance pressure transducer.
The supplemental characteristic detected with upper sensor sends into PLC, makes PLC carry out the collection of parameter and signal, computing, regulation output and control to the field apparatus of desulphurization system.
At present, the communication of S7-300PLC is blocked by special purpose interface card 5611 and the realization of MPI cable.But the middle-size and small-size industrial control system such for pit-head power station Desulfurization Control Systems uses such hardware, and cost is relatively costly, simultaneously also higher to the technical requirement of operating personnel.The present embodiment proposes by common serial ports, realizes the free communication of PLC and host computer.Host computer carries out setting parameter, system fading margin setting parameter, real time execution curve detection and device failure alert etc. according to the detection data obtained to the technique of field apparatus again, realizes automatic management and the control of desulphurization control process.
In addition, because system does not have power source special to power, but by mains supply.High power load etc. in the thyristor rectifier be connected with electrical network and sweetening process, operationally can produce a large amount of higher hamonic waves, and AC network is polluted, voltage waveform distorts.Therefore the on-the-spot power supply being used for powering to PLC, printer and host computer etc. is with isolating transformer and power-supply filter, and to strengthen antijamming capability, circuit as shown in Figure 3.Because the High-frequency Interference master in electrical network is if it were not for the Mutual Inductance Coupling of the former and deputy sideline circle by transformer, but be coupled by the distribution capacity between former vice-side winding, system have employed isolating transformer for this reason, Isolated Shield layer is all had between the former vice-side winding of isolating transformer, and by zero potential line through capacity earth, thus the distribution capacity between the former vice-side winding of this isolating transformer is very little, so anti-electrical network interference performance is very strong.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solutions of the utility model.
Claims (6)
1. the flue gas desulphurization control system based on PLC, it is characterized in that: the host computer (6) comprising PLC (1) and be connected by RS232/485 module (7) with PLC (1), described host computer (6) is connected with colorCRT (5), described host computer (6) is connected with UPS module (4) with colorCRT (5) input, described PLC (1) output is connected with control circuit (8), described control circuit (8) output is connected with executing agency (9), described executing agency (9) is connected with desulphurization system (3), described desulphurization system (3) is connected with PLC (1) input by signal deteching circuit (2), the flue gas heat exchanger that described desulphurization system (3) comprises booster fan and is connected with booster fan output, described flue gas heat exchanger output is connected with absorption tower, be connected with slurry tank by pipeline in the middle part of described absorption tower, described absorption tower bottom end is connected with autoxidation blower fan by pipeline, and bottom described absorption tower, the other end is connected with dewatering system by gypsum draining pump.
2. a kind of flue gas desulphurization control system based on PLC according to claim 1, is characterized in that: described PLC (1) adopts Siemens SEMATICS7-300 Programmable Logic Controller.
3. a kind of flue gas desulphurization control system based on PLC according to claim 2, is characterized in that: described EMATICS7-300 Programmable Logic Controller comprises CPU module, AI module, AO module, DI module and DO module.
4. a kind of flue gas desulphurization control system based on PLC according to claim 1, is characterized in that: described host computer (6) adopts and grinds magnificent IPC-6102 industrial control computer.
5. a kind of flue gas desulphurization control system based on PLC according to claim 1, is characterized in that: described signal deteching circuit (2) is the sensing detection circuit based on slurry pH value sensor, dust concentration sensor, flue gas pressures sensor, flue-gas temperature sensor.
6. a kind of flue gas desulphurization control system based on PLC according to claim 1, it is characterized in that: described UPS module (4) front end is electrically connected with city by wave filter, an isolating transformer successively, described isolating transformer is also connected with PLC (1) by another wave filter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520545608.2U CN204746089U (en) | 2015-07-27 | 2015-07-27 | Flue gas desulfurization control system of thermal power plant based on PLC |
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| CN201520545608.2U CN204746089U (en) | 2015-07-27 | 2015-07-27 | Flue gas desulfurization control system of thermal power plant based on PLC |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091394A (en) * | 2016-06-29 | 2016-11-09 | 无锡锡能锅炉有限公司 | A kind of control technique of boiler combustion process |
| CN107469609A (en) * | 2017-09-06 | 2017-12-15 | 杭州小橙工业设计有限公司 | A kind of full-automatic desulphurization system |
| CN109276990A (en) * | 2018-09-19 | 2019-01-29 | 厦门邑通软件科技有限公司 | A kind of circulating pump consumption reduction intelligent management system |
| CN113188339A (en) * | 2021-05-28 | 2021-07-30 | 赣州科帕机电自动化有限公司 | Kiln operation equipment control system |
-
2015
- 2015-07-27 CN CN201520545608.2U patent/CN204746089U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091394A (en) * | 2016-06-29 | 2016-11-09 | 无锡锡能锅炉有限公司 | A kind of control technique of boiler combustion process |
| CN107469609A (en) * | 2017-09-06 | 2017-12-15 | 杭州小橙工业设计有限公司 | A kind of full-automatic desulphurization system |
| CN109276990A (en) * | 2018-09-19 | 2019-01-29 | 厦门邑通软件科技有限公司 | A kind of circulating pump consumption reduction intelligent management system |
| CN113188339A (en) * | 2021-05-28 | 2021-07-30 | 赣州科帕机电自动化有限公司 | Kiln operation equipment control system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20160727 |
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| CF01 | Termination of patent right due to non-payment of annual fee |