SU1228117A1 - Gas analysing system - Google Patents

Abstract

The invention relates to a gas analysis technique, namely, automatic systems for continuous selection, transportation, purification, preparation and analysis of gas flow, for example, analyzing the content of blast furnace blast furnace components, and presenting measurement information in the form of standardized signals, and can be used in metallurgical, chemical and other industrial fields. The aim of the invention is to improve the reliability of the system, which is achieved by monitoring the state of gas lines and controlled electrical circuits, determining the state of sample preparation devices by a combination of signals of their state, generating and transmitting a system failure signal to the ECM computer or to the control panel. domain process. In the gas analytic system, a half-wave detector, a thyristor optocoupler, an amplifier, a matching element, inverters, their interconnections and connections with other devices of the system are used to generate a binary code signal about the state of the controlled electrical circuit from the corresponding output bus output of the interface device to the winding control operated solenoid valve inclusive. Gas line signal Together with the state signal of an electric controlled circuit from an optoelectronic sensor, it is used to monitor the state of the cleaning and sample preparation devices installed in the gas line rupture between the pressure sensor and the controlled solenoid valve. A device for transmitting informative signals is a digital-to-analog converter that converts a binary code into a proportional unified current signal, for which an additional converter is required for use in the APCS system. A malfunction signaling device, consisting, for example, of two 8-bit intermediate memory registers, amplifiers and relays, in this invention is designed to transmit the malfunction signal and its interfacing device formed into micro-computers and transformed into a data output device. addresses in the form of a binary code in the computer ACS TP. 2 hp f-ly, 8 ill. % cl

Description

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The invention relates to a gas analyzer, namely, automatic KIM systems for continuous selection, transportation, purification, preparation and analysis of gas flow, for example, analyzing the content of blast furnace blast furnace gas components and presenting measurement information in the form of unified signals, and can be used in metallurgical, chemical and other industrial sectors.

The purpose of the invention is to increase the reliability of the gas analytical system, which is achieved by monitoring the state of gas lines and controlled electrical circuits, determining the state of the sample preparation devices from a combination of their state signals, generating and transmitting a signal about the system malfunction in the automated process control system computer or on the remote control domain process.

Figure 1 shows the block diagram of the proposed gas-analytical system; Fig. 2 is a block diagram of a computer and interface; on (| ig.Z and 5 - block diagrams of the matching unit channels; FIG. 4 is a block diagram of optoelectronic sensors; FIG. 6 is a block diagram of a signal transmitting device; FIGS. 7 and 8 are block diagrams of the microcomputer algorithms this system.

The gas analytical system contains serially connected along each path of the sampler 1, line 2 / transportation, device 3 for primary cleaning and preparation, including the first and fifth solenoid valves 4 and 5 and the second sensor 6 of pressure of the device for cleaning and sample preparation - cooler, filter, pressure regulator placed in the gap of the pipeline (not shown in figure 1), the device 7 for the secondary cleaning and sample preparation, including the second solenoid valve 8, the first and the third sensors 9 and 10, the third 11 and the fourth 12 electro valves pans (device for final cleaning of pressure and flow stabilization is not shown in FIG. 1), gas analyzers 13-15, block 16 for preparation and supply of blocking air 16, block 17 for calibration, block 18 for reconciliation, optoelectronic sensors 19-21 for health, microcomputer 22, device 23

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171 interface, display device 24, information transfer device 25 and fault signaling device 26.

The microcomputer 22 is designed to process measurement information, automate the control of the measurement process in accordance with a predetermined algorithm, and create sigals about the parameters of the gas mixture and the technical state of individual devices.

The interface device 23 is intended for preprocessing information and matching external devices with microcomputer 22. Microcomputer 22 contains resident modules — a central processor 27, power supply 28 and additional standard modules — a persistent storage 29 and a parallel exchange device 30, microcomputer modules 22 are combined channel 31 communication. The communication between the modules is based on the principle of active-passive, the central processor is always active.

The interface device 23 comprises a data output device 32 (ATC), a data input device 33 (AEC), and an analog-to-digital converter (A / D converter) 34, combined by communication channel 35. Information is exchanged between the interface device 23 and the microcomputer 22 via two lines — input and output in asynchronous mode.

The matching block 18 comprises channels for matching the positional signals of the pressure sensors with the inputs of the device 33 (UVB) and ha of channels for matching the control signals from the outputs of the device (ATC) c. The purpose of the control solenoid valves 4,5,8 and 11,12. In addition, the matching unit 18 provides for galvanic isolation of digital and analog control circuits and states.

The channel of the unit 18 for matching the output digital signals of the device 23 of the interface (outputs ATC 32) with the control circuits of the solenoid valves contains an inverter 36, a detector 37 of mains voltage, a trigger 38, an amplifier 39 of the control signal of the optocoupler 40, a rectifying bridge 41.

The optoelectronic sensors 19-21 of each contain one half-wave rectifier 42, an optocoupler 43, a thyristor matching element 44, and inverters 45 and 46. The channel of the unit

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In the pressure sensor with the bus, the input of the data of the interface device 23 (the inputs of the ACB 33) contains a voltage source 47, a pressure relay 48, a thyristor optocoupler 49, a matching element 50, an inverter 51.

The malfunction signaling device 26 contains intermediate memory registers 52, direct voltage amplifiers 53, relay 54.

The gas analytic system operates according to the program recorded in the read-only memory of the microcomputer 22.

The program organizes the input-output and processing of the measurement control and control information.

During operation, the system cycles through a series of modes, each of which has specific functions. Information on the current mode is displayed on the indicators of the display device 25. The change of the system modes occurs at the end of the current mode or when a sign appears on an extraordinary transition.

An example of the operation of the system of its controlled solenoid valves is shown in Fig. 7.

In preparation mode, the heat balance of the system is performed. In this case, according to the program, from the corresponding outputs of the ATC 32 of the device 23 of the junction, digital control signals of logic level 1 are received at the digital inputs of the matching unit 18.

The control signal in the matching unit 18 is fed to the input of the inverter 36, and from its output - to the installation in the unit of the trigger 38.

The input of the detector 37 receives the network voltage, from the output of which the inverted pulses with a doubled frequency and a predetermined front are fed to the input of setting zero of the trigger 38. With a positive front of the pulse from the output of the detector 37, the trigger 38 is triggered. The signal from the trigger output is amplified by the amplifier 3.9 and fed to the input of the opto-driver 40. At the same time, the optocouctor triggers, its resistance drops, and by doing so it allows current to flow through the rectifier bridge, and hence the control winding of the electro-valve connected to the outputs of the matching channel. The network voltage is applied to the control windings.

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solenoid valves 4 and 8 and closes them for ingress of gases, and solenoid valve 8, opens for entry through it, and, therefore, through the device 7 for secondary cleaning and sample preparation and gas analyzers 13-15 blocking air from block 16. Thus, block 18 matching provides matching of electrical levels and contactless switching of the control circuit of microcomputer 22 and solenoid valves 4 and 8. In addition, it ensures their galvanic isolation.

Similarly, the coordination and control of all electrovalves of the system is carried out.

Upon completion of the preparation mode, the system automatically switches to the calibration mode, in which the control signal level 1 to the solenoid valve 11 is supplied from the corresponding outputs of the interface 23 via the matching block 18 to the solenoid 12 that ensures the flow of calibration mixtures through gas analyzers 13 -15, alternately on the valves (not shown in Fig. 1) of the calibration unit 17, which provides zero calibration with pure nitrogen and scales ends with mixtures,, respectively. In addition, during the calibration mode, prophylactic air blowing through the solenoid valve 5 and condensate discharge from the dehumidifiers are performed. If in calibration mode it turns out that the pressure of the test gas mixture in calibration block 17 is below the allowable one, the calibration for this mixture is not performed. The sign of a deviation in pressure of this mixture from the norm is established and the transition to the next mixture takes place.

Upon completion of the calibration mode, the system automatically switches to the analysis mode, in which, in order to ensure reliability and save energy, all electrical valves with a microcomputer 22 are transmitted through the device for 23 seconds, the control unit and the matching unit 18, the control signals of the logic level O, i.e. all solenoid valves are de-energized. The gas from the blast furnace blast enters through the sampler 1, the heated transport line 2 to the primary cleaning and preparation device 3, in which

cleaning at the temperature below the dew point of the gas sample from the moisture, fine dust and discharge of the dust. The gas inlet manifold of the pressure sensor 6, which monitors the predetermined pressure level in device 3, is connected to the gas pipeline after the cleaning and sample preparation devices (located in the gas line rupture and not shown in Fig. 1), and the electrical output of pressure sensor 6 is connected to the second input of the matching unit 18.

The change in pressure in the gas pipeline system 1F1 from the setpoint of the sensor leads to closure or opening (depending on the initial state - W1). Relay contacts 48 through which voltage source 47 is connected to the analog input of the matching unit. When the contacts are closed, the voltage from the source 47 is fed to the input of the optocoupler 49, from the output of which the voltage goes to the matching element 50, is inverted by an inverter 51, the output of which is the digital output of the matching unit 18, the signal about the gas circuit converted in this way in the unit 18 matching the level of digital signals to the appropriate input of the air-blast device 33 of the interface 23 Next, gas samples are fed to the device 7 for secondary cleaning and sample preparation, where it is finally cleaned from and lags py.gsh, stabilized temperature, flow and pressure. Pressure sensors 9 and 10, similarly to pressure sensor 6, provide, respectively, control of a predetermined pressure level of the blocking air and gas. The pressure sensor of the calibration block 17 similarly provides for monitoring the pressure level of the mixture.

Analog unified signals, proportional to the concentration of the corresponding component in the gas sample, from the outputs of gas analyzers are fed to the inputs of the A / D converter 34 of the interface 23. From the A1Sh 34 outputs, the digitized information signals are transmitted through the parallel exchange device of microcomputer 22 to the central processor 27, where they are processed accordingly, taking into account the nominal statistical characteristic

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gas analyzer and mutual influence functions. From the outputs of the microcomputer 22, the signals are fed to the inputs of the ATC 32 of the interface 23, from the outputs of which, the signals In a form of a form are fed to the inputs of the display 24, the information transfer device 25 in the form of unified current signals and the fault signal transmission device 26.

In parallel, each of the rectifying bridges 41 of the matching unit 18 includes the inputs of optoelectronic sensors 19-21 (3 out of m sensors are shown in Fig. 1), the following states of controlled electrical circuits are controlled: on, off, short distance, discontinuity.

When a current flows through a rectifying bridge, its resistance is almost equal to O and the entire voltage of the circuit falls on the windings of the solenoid valve. Therefore, when a digital controller of a Kitz signal with a logic level 1 arrives at the input of the matching unit 18, a voltage is applied to the input of the optoelectronic sensor, and the thyristor optocoupler 43 is activated and stores the signal of the state of the power controlled solenoid circuit. The on state signal with a logic level 1 from the output of the optocoupler enters the matching element 44, is inverted by the inverter 45, and is fed to the corresponding input of the data input device 33 of the interface 23.

The state sensors are polled in software after a certain time. For re-polling, it is necessary to reset the previous information, for which purpose with the corresponding. In this case, the output of the data output device 32 of the interface device 23 receives a reset signal to the input of the second inverter 46. The inverse signal from its output goes to the second input of the optocoupler 43 and turns it off. In the absence of voltage at the input circuit of the optoelectronic sensor, at its output, i.e. the output of the first inverter 45 will be a logical signal O, which means - off.

In the event of a short circuit of a controlled power circuit, the voltage of the network is fed to the input of the optoelectronic sensor in the presence and absence of a digital control signal.

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ATC output 32 device 23 interface. The output of the optoelectronic health sensor will be a logical signal 1. When the power circuit of the solenoid valve is broken and any value of the control signal, the voltage does not enter the input of the optoelectronic sensor, therefore, its output will be a logical O signal.

According to the results of the logical processing in the central processor 27 of the microcomputer 22, simultaneously the values of control signals (SU) at the output of ATC 32 and state signals (SSE) of the controlled electric circuit at the corresponding input of the SWC 33 and the state of the circuit from four possible and a malfunction signal (CH) is generated, if any.

Example. SU 1, SSE 1 - the voltage on the control winding of the solenoid valve, CH O, is turned on, i.e., there is no fault signal; SU O, SSE O - off voltage; CH 0; SU 1, SSE O - time

controlled circuit breakth, CH 1; SU O, SSE 1 - short circuit of the controlled circuit, CH 1.

At the output of each optoelectronic sensor, two signals a (O and 1) are formed, carrying information about the state of the circuit; at the output of the malfunction signaling device 26, one signal is generated that carries information about the presence of a malfunction, as well as the address signal of the malfunction elements.

,, According to the results of simultaneous logical processing in the microcomputer of 22 gas circuit state signals (VEL), controlled electric circuits (SSE), and control signals (cV), the state of the devices connected to the gas circuit between the control valve and the sensor is determined. pressures, for example, filters, dehumidifiers of regulators (shown in figure 1 by the rupture of a gas pipeline) in devices for primary and secondary sample preparation.

Example. , SSE O, SSG 1 - the solenoid valve is open, gas enters, CH 0; SU 1, SSE 1, SSG about - solenoid valve is closed, gas does not flow, СН 0; SU O, SSE O, SSG O - the valve is open, but the gas does not flow, therefore, the filter is clogged, CH - I; SU 1, SSE I, SSG 1 - valve is closed, gas per hectare

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The line should not be received, therefore, the pressure sensor itself, CH 1, is faulty.

The signals of the presence of faults, the address of the faulty element are output via the communication channel 31, the parallel exchange device to the inputs of the ATC 32 of the interface 23. From the outputs of the ATC 32, the interface device 23 arrives at the outputs of the registers 52 of the intermediate memory of the malfunction signaling transmission device 26. Writing and reading data in the register-. The pax 52 is produced by matching the write address signal and the data output signal received at the first and second control inputs of the intermediate memory registers 52 from the outputs of the ATC 32 of the interface 23. The signals from the outputs of the registers 52 are fed to the inputs of the amplifiers 53 DC, amplified to the desired level and fed to the windings of the relay 34, the contacts of which are the outputs of the device transmitting the fault signals.

In order to save expensive calibration gas mixtures, the ho completion of the analysis mode, the subsequent two calibration modes are replaced by a control mode in which the zeroes of the gas analyzers are calibrated by air. In case of zero drift, the calibration mode is activated.

The use of optoelectronic sensors and a device for signaling faults in the proposed system makes it possible to programmatically monitor the state of controlled electrical circuits and determine the state of other devices of the system based on the mutual state of the controlled electrical and gas ones, and therefore, minimize the downtime of the system and the entire process.

Claims (3)

Invention Formula 1, Gas analyzing system containing sequentially connected along a gas path a sampler, a transportation line, first to fourth solenoid valves installed in sample preparation devices, gas analyzers, a block of preparation and supply of blocking air which is connected along the gas path with. the inputs of the first pressure sensor and the fifth electrovalve and with the second input of the second electrovalve, the second and third pressure sensors, the inputs connected respectively to the outputs of the first and second electro valve, the calibration unit, the output of which is connected to the second input of the fourth electrovalve, and also a microcomputer connected to the interface device and a matching unit, the analog inputs of which are connected to the outputs of the pressure sensors and the analog output of the calibration unit, the analog outputs to the control electro valve and calibration unit moves, and digital outputs and inputs, respectively, with input and output buses of the interface device, to the analog inputs of which the information inputs of gas analyzers are connected, in order to increase the reliability of the system, optoelectron- electrovalve health sensors and a fault signaling device, the inputs of which are connected to the inputs of the display and information devices, are connected to the output bus of the interface device, and the information e optoelectronic sensors electrovalves inputs connected to the outputs of serviceability matching control unit, control inputs connected to 2811710 the output bus and the outputs to the input bus of the interface device. 2. Pop-1 system, characterized in that the optoelectronic 5, the electrovalve health sensor contains a half-wave rectifier, a thyristor optocoupler, a matching element, first and second inverters, one-half-wave outputs of you} 0 terminal connected to the first inputs of the thyristor optocoupler, the output of which is connected to the input of the matching element, and the output of the matching element is connected to the input of the first InJS of the inverter, the second input of the thyristor optocoupler is connected to the output of the second inverter, the input of which is the control input of the sensor, the output of the sensor is the output of the first inverter 20, and the information input is a half-wave rectifier input. 3. The system of claim 1, wherein the fault signal transmitting device contains intermediate memory registers, dc voltage amplifiers and relays, each output of the intermediate memory registers is connected to the input 3Q of the corresponding DC amplifier, to the output of which a relay coil is connected, the contacts of which are the outputs of the device, and the inputs of the intermediate memory registers are its inputs.  ШГ т. ill imimi 111 I I MMM i ffem Jfi HMiMk mmMMY tput.J mt 0 j; I I ( 3B +58 ITHlgTnCy S 37 Q one S t I  one r i r li -r s - one About V: Fig.Z . o-b5 f8 "five C rlfirn Fi9.5