CN2271663Y

CN2271663Y - Feeding interrupt alarmer for boiler

Info

Publication number: CN2271663Y
Application number: CN 96228968
Authority: CN
Inventors: 刘国起; 庞殿忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-20
Filing date: 1996-09-20
Publication date: 1997-12-31
Anticipated expiration: 2006-09-20

Abstract

The utility model discloses a coal-feeding break alarm device of a boiler, which has electrodes (5), (6) and an amplifying circuit, wherein the electrodes (5), (6) are arranged in a coal falling barrel and are connected into an alarm circuit by conductive wires (2), (7), and a full-bridge type rectification circuit is connected onto a secondary coil of a transformer B. The amplifying circuit is composed of an R1 and a T1, a collecting electrode of the T1 is connected with a relay J1, and the normally closed contacts J1-1 and J1-2 of the J1 are respectively connected with an electric bell JL and an indicating lamp RL1. The alarm device can send out acoustic-optic alarm signals when the coal-feeding operation is broken so as to remind people on duty to take measures as soon as possible, and eliminates various problems brought by the dial-free phenomenon caused by the blockage of the coal falling barrel.

Description

Boiler coal feeding interrupts warning device

The utility model provides a kind of boiler coal feeding to interrupt warning device, is used for the monitoring to the boiler coal feeding situation.

Coal supply is safe operation of the boiler, combustion stablized prerequisite reliably continuously.But because the influence of coal supply channel design, a lot of coal-burning boilers are in operation more or less coal supply outage all can occur.Modal is to interrupt because of coal conduit stops up the coal supply that causes, is commonly called as " fanning the air ".Particularly rainy season, because coal-fired water content is higher, this " fanning the air " phenomenon is more frequent.To independent industrial steam supply boiler, this steam temperature that causes because of " fanning the air ", the quality (product as the printing and dyeing enterprise dyeing workshop can all become substandard products) that vapour pressure reduction meeting directly influences product.Boiler influence to the power plant that has Turbo-generator Set and steam power plant is even more serious.Because steam turbine steam inlet condition (steam temperature, vapour pressure) requires relatively stricter, if fluctuation is bigger, will have a strong impact on the safe operation of Turbo-generator Set.Usually, this phenomenon that fans the air is observed unusual reduction of steam temperature, vapour pressure by the person on duty and is found, but at this moment finds late.Even if in time recover coal supply, also can cause load shedding.If do not get rid of rapidly, will cause blowing out, shutdown.

The purpose of this utility model is to provide a kind of boiler coal feeding to interrupt warning device, interrupts to find coal supply as early as possible, takes measures to handle, and avoids the boiler coal conduit to stop up the problem that produces.

The utility model is to realize like this, it has the electrode that is installed in the coal conduit, electrode is connected in the warning circuit by lead, there is the full-bridge type rectification circuit to be connected on the secondary coil of transformer on the warning circuit, on the transistor collector of amplifying circuit, be connected to relay, be connected to electric bell and indicator lamp respectively on two pairs of normally-closed contacts of relay.

Adopt the boiler coal feeding of said structure to interrupt warning device, simple in structure, easy for installation, use reliable.Reasonably settle two electrodes, can be implemented in boiler and really interrupt just sending alarm signal before the coal supply.Electrode is installed in up and down in the coal conduit, can reflects the coal supply outage between two electricity.Remind person on duty to eliminate " fanning the air " phenomenon as early as possible, blowing out, load shedding even the machine halt trouble of having avoided " fanning the air " to bring effectively.Coal conduit is equipped with the boiler of flutter device, also can realizes fanning the air reporting to the police and handle automation.In a single day promptly " fan the air ", the flutter device will beat coal conduit automatically, eliminate " fanning the air ".

Below in conjunction with description of drawings concrete structure of the present utility model.

Fig. 1 is the schematic diagram that electrode is installed in the utility model.Fig. 2 is the schematic diagram of electrode structure.Fig. 3 is the circuit diagram of warning circuit.

As shown in drawings, the boiler coal feeding of the utility model interrupts warning device, the electrode (5) and the electrode (6) that are installed in the coal conduit (1) are arranged, two electrodes are connected in the warning circuit by lead (2) and lead (7) respectively, on warning circuit, the full-bridge type rectification circuit is connected on the secondary coil of transformer B, and electrode (5) is by lead (2) and resistance R J ₁Be connected on the positive pole of full-bridge type rectification circuit, electrode (6) passes through lead (7) through resistance R ₁Meet triode T ₁Base stage, relay J ₁Be connected on RJ ₁And T ₁Colelctor electrode between, J ₁Last cross-over connection has diode D ₁, capacitor C ₁Be connected across RJ ₁And between the full-bridge type rectification circuit negative pole, electric bell JL ₁Indicator lamp RL ₁Pass through J respectively ₁Normally-closed contact J _1-1, J _1-2Be connected across on the power line.

During normal the operation, electrode (2) links to each other by the ature of coal in the passage with electrode (6), is conducting state (survey two interelectrode resistance values at thousands of ohms, the resistance value size is influenced by coal-fired granular size, water content height, coal and channel outer wall), T ₁Be saturation state, J ₁Get electric work.In case coal-fired interruption the between two electrodes, T will be changed into by conducting and ends, simultaneously J ₁Dead electricity, its normally-closed contact closure is connected electric bell, indicator lamp, sends the sound and light alarm signal." fan the air " after the elimination, reporting to the police also will automatically terminate.

The warning device of the utility model can be as shown in Figure 3, and every pair of electrode of two covers is installed after transformer the independently warning circuit of rectifier power source, also can increase corresponding warning circuit as required, to guarantee the reliable and stable operation of boiler.

Electrode (2) and the available stainless steel material of electrode (6) are made.Electrode is installed on the bakelite plate (3) by nut (4), and bakelite plate (3) is installed on the coal conduit (1).

Claims

Boiler coal feeding interrupts warning device, it is characterized in that, it has electrode (5) and the electrode (6) that is installed in the coal conduit (1), two electrodes are connected in the warning circuit by lead (2) and lead (7) respectively, on warning circuit, the full-bridge type rectification circuit is connected on the transformer B secondary coil, and electrode (5) is by lead (2) and resistance R J ₁Be connected on the positive pole of full-bridge type rectification circuit, electrode (6) passes through lead (7) through resistance R ₁Be connected on triode T ₁Base stage, relay J ₁Be connected on RJ ₁And T ₁Colelctor electrode between, J ₁Last cross-over connection has diode D ₁, capacitor C ₁Be connected across RJ ₁And between the full bridge rectifier negative pole, electric bell JL, indicator lamp RL ₁Pass through J respectively ₁Normally-closed contact J _1-1, J _1-2Be connected across on the power line.