CN2311696Y

CN2311696Y - Flame monitoring alarmer for boiler of power station

Info

Publication number: CN2311696Y
Application number: CN 97247891
Authority: CN
Inventors: 陆厚平
Original assignee: 陆厚平
Current assignee: Nanjing Huaneng Huaneng Electric Industry Development Co., Ltd.
Priority date: 1997-12-02
Filing date: 1997-12-02
Publication date: 1999-03-24
Anticipated expiration: 2007-12-02

Abstract

The utility model relates to a monitoring alarm device which is composed of a plurality of unit circuits whose line structures are same, each unit circuit is provided with a group of image signal processing circuits, the input end of each processing circuit is correspondingly connected with the output ends of a plurality of groups of instruments for taking pictures of flames arranged near the combustor of a station boiler, the multiplexed output end is connected with a first memory through each analog to digital converter, and simultaneously, the multiplexed output end is connected with the input end of an image switching circuit; the output end of the image switching circuit is connected with a second memory through the analog to digital converter, the output end of the first memory is connected with a monitor through the digital to analog converter, the output end of the second memory is directly connected with an industrial microcomputer, and the output end of the microcomputer is also connected with the monitor.

Description

Station boiler flame monitoring alarm

The utility model relates to a kind of monitoring alarm, particularly a kind of monitoring alarm that is used to monitor station boiler flame.

Along with developing rapidly of China's power industry, the power station single-machine capacity constantly increases, and boiler plant structure and accessory system thereof are increasingly sophisticated, and coal changes greatly, and often according to the continuous peak regulation of electrical network demand, the factor that influences safe operation of the boiler is increasing for operating load.Particularly in the startup and shutdown of units process, operation is frequent, in case running into operations staff's misoperation, error in judgement or operating mode adjusts untimely, will cause stove internal combustion instability, flame pulsation, and the burner hearth fire extinguishing may take place, if still constantly to the burner hearth internal powder conveying, the danger that causes furnace explosion is just arranged this moment.Therefore in order to detect the boiler combustion operating mode timely, sensitive, reliably, prevent under operating modes such as igniting, low load combustion instability, to take place the furnace explosion accident, according to the Electricity Department operating standard, the necessary configuration feature of station boiler is complete, the reliable Furnace Safeguard Supervisory System of equipment, and the Furnace Safeguard Supervisory System success or not that puts into operation depends on to a great extent whether the function of used power boiler burning flame monitoring is reliable and perfect.But existing flame monitoring apparatus all adopts visible light flame detector and testing circuit thereof to constitute; it can only flame detection have or not; and because the angle of visual field tends to occur error signal for a short time; cause misoperation; all fundamentally do not solve flame and detect problem; cause the burner hearth safety guard of a lot of station boilers, the situation that comes into operation is relatively poor, influences the safety and economic operation of unit.

The purpose of this utility model is exactly for addressing the above problem, and it is accurate, stable, reliable to provide a kind of flame to detect, and can protect the station boiler flame monitoring alarm of safe operation of the boiler.

Technical solution of the present utility model:

A kind of station boiler flame monitoring alarm, it is made up of the identical element circuit of a plurality of line constructions, it is characterized in that each element circuit all has a picture group image signal treatment circuit, the input of each treatment circuit is corresponding with near the output of many groups flame image intake device being arranged on power station boiler burner to link to each other, its multichannel output connects first memory by analog-digital converter separately, simultaneously, above-mentioned multichannel output links to each other with the input of image switching circuit again, the output of image switching circuit connects second memory by analog-digital converter, the output of first memory connects monitor by digital to analog converter, the output of second memory directly links to each other with industrial microcomputer, and the output of microcomputer also links to each other with monitor.

The mode that the utility model utilizes special high-tech IMAQ sensor to combine with the computer digital image treatment technology of high speed development; detect the situation of the combustion flame of each burner of boiler; this is the late nineteen eighties flame detection new technology that begins to develop in the world; compare with traditional visible flare up inspection technology like this; because what obtain is video signal; not only can direct viewing actual flame image in real time; and because the information content that obtains had enlarged 10 5 powers doubly more in the past; just can judge having or not of flame more accurately; understand the stability of flame; burning quality and variation tendency thereof; make the utility model when combustion conditions worsens; become passive flame failure protection and be initiatively forecast; has warning function; and can be in optimum condition according to flame image analysis result adjustment boiler combustion; make boiler keep high efficiency of combustion and low NOx discharging,, thereby guarantee boiler unit safety and economic operation for the boiler combustion adjustment provides foundation.The utility model line construction is simple, integrated intelligence degree height, operating accuracy and good reliability, social benefit and good in economic efficiency.

Fig. 1 is the theory diagram of an element circuit of the present utility model;

Fig. 2, the 3rd, the electrical schematic diagram of an element circuit of the present utility model.

Device of the present utility model is made up of the identical element circuit of a plurality of line constructions, and needs come calmly its number according to supervising then, and the burner of general corresponding each layer of station boiler all should be provided with an element circuit of the present utility model.The block diagram of each element circuit such as Fig. 1, they all have a picture group image signal treatment circuit, the input of each treatment circuit is connected to many group flame images and gets intake device, the flame image intake device is made up of ccd video camera, color comparison temperature measurement device and lengthening mirror pipe, its structure was described in detail in another part patent application (application number is 97247792.6), selected for use four flame image intake devices to be placed near four jiaos of a certain layer of boiler burner usually.Correspondingly imaging signal processing circuit has four groups, they connect first memory by modulus converter A/D separately, simultaneously, above-mentioned four tunnel outputs link to each other with the input of image switching circuit again, the image switching circuit is single channel output, and it also connects second memory by modulus converter A/D, and the output of first memory connects monitor by digital to analog converter, the output of second memory directly links to each other with industrial microcomputer, and the output of microcomputer also links to each other with monitor.

Concrete circuit such as Fig. 2 of element circuit of the present utility model, 3, its four picture groups image signal treatment circuit is by four video image amplifier IC1 (model can be MAX4278) and input resistance R1 and output resistance R2, R3, R4, R5 forms, input and output resistance carries out impedance matching, the input of four video image amplifier IC1 links to each other with the output of four flame image intake devices respectively, receive the picture signal S1-S4 that they are sent here respectively, the output of four video image amplifier IC1 is connected with the input of four high-speed video analog-digital converter IC2 (model can be CA3318CE) by output impedance translation circuit R2-R5 separately, the output of four analog-digital converter IC2 meets the first memory IC4, and (it is the frame storage, model can be SRAM6116) input, the output Y0-Y7 of IC4 connects the input of digital to analog converter IC5 (model can be DAC0800), and the output of IC5 links to each other with the corresponding input of monitor IC6 (can select the NEC-21-CRT monitor for use).Four outputs of four picture group image signal treatment circuit IC1 link to each other with the input of image switching IC circuit 3 (model can be MCl4066) simultaneously, the output of IC3 connects the anti-clutter circuit of being made up of transistor T 1, diode D1, resistance R 25, R26, and this circuit is used for preventing when commutation circuit IC3 from switching that other three the tunnel disturbs a road selected signal of IC3.The output Z0 of anti-clutter circuit connects the input of high-speed video analog-digital converter IC7 (model can be CA3318CE), the output of IC7 connects the input of the second memory IC8 (model also can be SRAM6116), the output of IC8 directly links to each other with industrial microcomputer CPU (as Intel-166), and the output of CPU also is connected with monitor IC6.

When the utility model is used, each layer burner of corresponding station boiler all is provided with an element circuit of the present utility model, in arbitrary element circuit, four groups of flame video signals that four flame image intake devices are sent here through four picture group image signal treatment circuit IC1 amplify and the impedance conversion after, its four groups of processed images signals are through sending into first memory IC4 storage after the analog-digital converter IC2 conversion separately, and arrange in certain sequence, deliver to monitor IC6 through digital to analog converter IC5 then and show above-mentioned four groups of flame images in real time.The output of four picture group image signal treatment circuits is delivered to image switching IC circuit 3 with four groups of flame image signals of handling simultaneously, it is only chosen one the road in order to four groups of flame image signals and delivers to and enter the second memory IC8 after the analog-digital converter IC7 conversion and store, deliver to industrial microcomputer CPU then, the work of above-mentioned commutation circuit IC3 is that constantly circulation is carried out, four groups of flame image signals are chosen successively, CPU just judges each road flame image signal according to inner intelligence control system software, if have unusual, promptly send alarm signal and deliver to monitor IC6 demonstration, be convenient to the staff and take corresponding measure.

Claims

1, a kind of station boiler flame monitoring alarm, it is made up of the identical element circuit of a plurality of line constructions, it is characterized in that each element circuit all has a picture group image signal treatment circuit, the input of each treatment circuit is corresponding with near the output of many groups flame image intake device being arranged on power station boiler burner to link to each other, its multichannel output connects first memory by analog-digital converter separately, simultaneously, above-mentioned multichannel output links to each other with the input of image switching circuit again, the output of image switching circuit connects second memory by analog-digital converter, the output of first memory connects monitor by digital to analog converter, the output of second memory directly links to each other with industrial microcomputer, and the output of microcomputer also links to each other with monitor.

2, by the described station boiler flame monitoring of claim 1 alarm, it is characterized in that the multiple series of images signal processing circuit is by a plurality of video image amplifier IC1 and input resistance R1 and output resistance R2, R3, R4, R5 forms, the input of each video image amplifier IC1 links to each other with the output of a plurality of flame image intake devices respectively, the output of each video image amplifier IC1 is connected with the input of separately high-speed video analog-digital converter IC2, the output of each analog-digital converter IC2 connects the input of the first memory IC4, the output Y0-Y7 of IC4 connects the input of digital to analog converter IC5, and the output of IC5 links to each other with the corresponding input of monitor IC6; The output of each imaging signal processing circuit IC1 links to each other with the input of image switching IC circuit 3 simultaneously, the output of IC3 connects the anti-clutter circuit of being made up of transistor T 1, diode D1, resistance R 25, R26, the output Z0 of anti-clutter circuit connects the input of high-speed video analog-digital converter IC7, the output of IC7 connects the input of the second memory IC8, the output of IC8 directly links to each other with industrial microcomputer CPU, and the output of CPU also is connected with monitor IC6.