CN205620778U - Steam boiler's remote control system - Google Patents

Abstract

The utility model provides a steam boiler's remote control system, is the steam boiler remote control system based on PLC and GPRS module, comprises PLC, GPRS communication module, data processing terminal, field control equipment and instrument, data processing terminal can combine the demonstration of data to be in the same place with the input, reaches remote operation and monitors steam boiler's effect, the control hardware switching value gather to be adjusted analog signal's task and is mainly given the next quick -witted PLC, and data processing terminal mainly is responsible for modifing with the relevant parameter that sets for control system, the data of keeping watch on function state, storage and the inquiry system of boiler on line. Through PLC and data processing terminal's connection, realization equipment and operating personnel's is mutual.

Description

A kind of tele-control system of steam boiler

Technical field

The utility model belongs to steam boiler field, particularly to a kind of steam boiler tele-control system based on PLC and GPRS communication.

Background technology

Boiler is as energy conversion device, and its power-producing ability is still favored in contemporary society.Play indispensable effect in all trades and professions to become.Although there being most of steam boiler to take relatively advanced control method and design concept, but still there is the construction of a lot of small size steam boiler fairly simple, being similar to the steam generator system by Control.Owing to its human resources needing labour intensity a lot of, staff is too high, the reason such as the capacity efficiency of boiler is low, wasting of resources bad environments causes and is very limited when application.So we are necessary to design the steam boiler tele-control system of a set of advanced person, improve the operation level of boiler control system, improve capacity efficiency.

Utility model content

In order to overcome the deficiency of existing steam boiler control system, the utility model proposes a kind of steam boiler tele-control system based on PLC and the GPRS communication technology, use modularized design, in that context it may be convenient to upgrade existing steam boiler.

A kind of tele-control system of steam boiler, including for gathering the acquisition module of boiler signal, PLC module, GPRS communication module, terminal data processing module.Acquisition module is connected with GPRS module by PLC module, and GPRS communication module and terminal data processing module can pass through GPRS, note, three kinds of method communications of phone.

Signal acquisition module includes pressure transmitter, thermal resistance, electromagnetic flowmeter, double flange liquid level transmission device, glass plate level gauging table.Pressure transmitter measurement steam pressure, pressure of supply water and furnace pressure；Thermal resistance measurement import fire box temperature and vapor (steam) temperature；Electromagnetic flowmeter survey steam flow and feedwater flow；Boiler vapor liquid level measured by double flange liquid level transmission devices；Glass plate level gauging table measure field liquid level.Analog signal and data signal that the pressure transmitter of signal acquisition module, electromagnetic flowmeter, double flange liquid level transmission device, glass plate level gauging table gather are connected with Analog input mModule and the digital quantity input module of PLC module respectively through analog quantity terminal block and digital quantity terminal block, and the temperature signal of thermal resistance measurement is connected with the resistance thermometry of PLC module through temperature terminal row.

The utility model uses SIEMENS S 7-200 PLC, the DI/DO module of EM223 series, EM235 series A I/AO module, EM231RTD module (4 road thermal resistance input) and EM232 module (2 road analog output).

PLC module includes: power module, CPU module, analog input/output module, resistance thermometry.GPRS communication module is connected with PLC module by RS485 serial ports, and GPRS communication module uses the mode that GPRS and the triple communication of short message telephone combine.Terminal data processing module can be mobile phone or computer, and operating personnel can send SMS or control GPRS communication module on computers, it is achieved equipment start-stop, and parameter is arranged, failure reset etc..

In this control system, control hardware switch amount, the task of gathering regulation analog signal mainly gives slave computer PLC, and data processing terminal is mainly responsible for the data of the relevant parameter of modification and setting control system, the operating state of in-service monitoring boiler, storage and inquiry system.Connection by PLC and data processing terminal, it is achieved equipment and operating personnel's is mutual.

Data processing terminal includes: press button, numerical value input/display, alarm indication, diagram curve, animation bitmap, instrument, indicator lamp, figure, from drawing shape and part duplication.The display of data and input can be perfectly combined together by data processing terminal, can reach operation and the monitoring effect that automatically controls of steam boiler, make human-computer interaction interface very simple and friendly.

Control part is divided into host computer and slave computer two parts, and slave computer design includes PID controller module, steam water-level adjustment module and combustion chamber draft adjustment module.

PID controller in PID controller module, is the controller using wider closed loop in current engineering system, and the control function of PID closed loop relies on module B41 to complete in S7-200PLC.The form of selection course value input is parameter PVPER_ON, and when PVPER_ON is False situation, process values inputs from PV_IN, and its form is percentage.Control system changed PV_PER before this and became percentage PV_IN, then subtracted each other with setting value SP INT and draw error, and the error obtaining passes through pid algorithm again, and the process through some row finally obtain LMN or LMN PER output.

Steam water-level adjustment module has selected three-impulse cascade regulation system.In order to control water supply valve aperture and reduction " false water level " to water system run cause unfavorable, and allow steam water-level constant steam boiler running require scope.Steam water-level is main momentum signal in whole boiler flow process.

The relevant parameter of combustion chamber draft adjustment module occupies critical role in whole boiler workflow.So the parameter regulation of the measured value regulation and air-introduced machine applying combustion chamber draft realizes the regulation of the combustion chamber draft to steam boiler.Simultaneously in order to ensure system stability work, need control air-introduced machine to stablize the pressure of boiler internal.The management link of air-introduced machine can be approximated and regard proportional component as, owing to the operation inertia of induced draught system is less.The rational proportion of air output and absorbing quantity can make combustion chamber draft stablize safety.For economic purpose, particularly important to the reasonable adjusting of combustion chamber draft, control quality can also be improved and feedforward compensation is carried out to the air output of combustion chamber draft.

The task of host computer monitoring software is the properly functioning of the whole automatic control system of monitoring, and it requires to reach to monitor that data, control equipment, setup parameter, record are reported to the police, recorded the purpose such as trend curve and data sheet.According to the method for operating of monitoring system, after the substantially situation of I/O point first to be determined and some related I/O equipment, it is contemplated that the field conditions of project and the effect of monitoring system, then set about the making to monitoring system graphical interfaces.

The beneficial effects of the utility model: use mobile phone or computer as host computer, can show the running status of boiler intuitively, and directly can be controlled boiler by host computer and regulate, and significantly reduce the burden of staff.If there is hypotony or too high, temperature is unstable, and steam water-level is too high or too low just reports to the police, and pass through note or Advise By Wire operating personnel, recording real-time data simultaneously stores, and by predicting boiler operatiopn state to the analysis of historical data, is greatly improved boiler operatiopn stability.

Brief description

Fig. 1 is the utility model steam boiler process chart.

Fig. 2 is boiler input/output relation schematic diagram.

Fig. 3 is tele-control system structure chart.

Fig. 4 to Fig. 7 is PLC wiring schematic diagram.

Fig. 8 is the block diagram of FB41.

Fig. 9 is three impulses tank level control system block diagram.

Figure 10 is hearth vacuum control system block diagram.

In figure: 10 data processing terminals；20GPRS communication module；30PLC module；40 field control equipment and sensor.

Detailed description of the invention

The parameter that steam boiler control system mainly gathers includes the temperature and pressure of boiler, the temperature of steam, steam water-level and output.Operator passes through the rotating speed of the aperture to air valve for the data processing terminal and air-introduced machine, the regulation of the temperature of burner hearth, the pressure of feedwater, the flow of steam and steam water-level, it is achieved boiler remotely controls.

The instrument of this steam boiler tele-control system and performer are as follows: the 1st, pressure transmitter measurement steam pressure, pressure of supply water and furnace pressure；2nd, thermal resistance (RTD) measurement import fire box temperature and vapor (steam) temperature；3rd, electromagnetic flowmeter survey steam flow and feedwater flow；4th, double flange liquid level transmission devices measurement boiler vapor liquid level；5th, glass plate level gauging table measure field liquid level.

The tele-control system of steam boiler should comprise the different I/O point of following character: 8 On-off signal, 16 output switch parameter, 17 analog inputs, 7 analog outputs, 4 thermal resistances input.In the present system, the interface function of PLC is as shown in table the 1st, table 2 and table 3.

Table 1PLC interface function table

Table 2PLC interface function table

Table 3PLC interface function table

Control functional module FB41 realizing relying on PID closed loop in PLC of native system pid control function completes.Single loop closed-loop control or multiloop closed-loop control rely on FB41 functional block to realize, the function of this module is constant controller, cascade controller and proportional controller.Owing to the parameter of FB41 is wider, it is possible to take the relevant parameter that system determines.

Claims (1)

1. a tele-control system for steam boiler, including for gather the acquisition module of boiler signal, PLC module, GPRS communication module, terminal data processing module；Acquisition module is connected with GPRS module by PLC module, GPRS communication module and terminal data processing module can pass through GPRS, note, three kinds of method communications of phone；

Signal acquisition module include pressure transmitter, thermal resistance, electromagnetic flowmeter, double flange liquid level transmission device, Glass plate level gauging table；Pressure transmitter measurement steam pressure, pressure of supply water and furnace pressure；Thermal resistance Measurement import fire box temperature and vapor (steam) temperature；Electromagnetic flowmeter survey steam flow and feedwater flow；Double flanges Fluid level transmitter measures boiler vapor liquid level；Glass plate level gauging table measure field liquid level；Signals collecting mould The pressure transmitter of block, electromagnetic flowmeter, double flange liquid level transmission device, glass plate level gauging table gather Analog signal and data signal are through analog quantity terminal block and the digital quantity terminal block analog quantity with PLC module respectively Input module and digital quantity input module connect, and the temperature signal of thermal resistance measurement is through temperature terminal row and PLC mould The resistance thermometry of block connects；

PLC module includes: power module, CPU module, analog input/output module, resistance thermometry； GPRS communication module is connected with PLC module by RS485 serial ports, GPRS communication module employing GPRS and short The mode that the letter triple communication of phone combines；Terminal data processing module is mobile phone or computer, operating personnel Sending SMS or controlling GPRS communication module on computers, it is achieved equipment start-stop, parameter is arranged, fault Reset.