CN2132224Y

CN2132224Y - Alarm for measuring coal quantity of boiler

Info

Publication number: CN2132224Y
Application number: CN 92228389
Authority: CN
Inventors: 桂质文
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-20
Filing date: 1992-07-20
Publication date: 1993-05-05
Anticipated expiration: 2002-07-20

Abstract

The utility model relates to an alarm for measuring the coal quantity of a boiler, comprising a coal position sensor, an amplifier and a coal quantity recorder. The alarm is characterized in that the coal position sensor is a gravitational displacement sensor which comprises a lever, a spring and a mercury switch. One of the upper and lower two coal position measuring points is arranged at the inlet of a coal bin and the other is arranged at the inlet of a combustion chamber. After the coal quantity recorder and a processing circuit are adopted, a boiler user can accurately and reliably determine and find out the information of the coal position and the coal quantity from the dial of the alarm. Therefore, the phenomena of the extinguishment of the combustion chamber and the unsteadiness of the combustion are avoided. The safe and economic operation of the boiler is ensured. The existing problems of the measurements of the coal position and the coal quantity of various boilers are solved.

Description

Alarm for measuring coal quantity of boiler

The utility model relates to instrument field, particularly a kind of steam coal amount meter record alarm.

In the boiler operatiopn, in service at the low-temp low-pressure medium small boiler especially, for coal-supplying amount and accurate and reliable metering of coal bin coal position neither one and demonstration, the time have the disconnected coal of burner hearth to cause flame-out or the not enough combustion instability phenomenon that causes of coal-supplying amount takes place, operation has produced harmful effect to safe and economical boiler; The coal meter record instrument that uses in this class boiler now, the sensor of gathering the coal-supplying amount signal is contained on the coal supply arbor, as long as feeder is in operation, just meter is recorded coal-supplying amount, but because coal is wet or the coal grain is excessive, just usually be stuck, do not enter burner hearth, therefore can not determine the coal supply state from coal meter record instrument merely, so aforementioned trouble has just been arranged.

The utility model passes through the special design of coal quantity sensor and the selection of its position, and is equipped with the relevant treatment instrument, and its purpose is intended to thoroughly solve aforementioned steam coal amount demonstration and counts the unreliable disadvantage of record out of true.

The key issue that the coal meter amount is reported to the police is in sampling.Because coal particle thickness inequality, do wet irregular, coal residing position different pressures in coal bunker is also different, on-the-spot bad working environment attacks, shakes or the like factor as striking, cause selecting for use or design and install and facing very serious dried scratching or a distortion difficult problem of level sensor, the sensor of alarm described in the utility model can address the above problem fully.Described sensor is a kind of gravitational displacement formula sensor, is made of lever, spring and mercury cut-off, and check point divides height two places to arrange; For high-order measuring point, this measuring point is arranged near coal bunker coal charge porch, as shown in Figure 1, it is characterized by: a spring (1) is housed on the coal bunker wall, lever (2) is a straight-bar, and an end stretches into coal bunker, and the other end is equipped with mercury cut-off (3) and is linked together with spring (1); When no coal, lever (2) is vertical with bulkhead, and mercury cut-off (2) disconnects; When coal, lever (2) run-off the straight under the coal action of gravity, mercury cut-off is connected; So just, can accurately detect coal bunker level indicator.For the low level measuring point, this measuring point is arranged in boiler furnace coal porch, promptly be between burner hearth inlet coal lock and the burner hearth, it is characterized in that: the lever as sensor is a baffle plate (5), this baffle-type lever can swing around its axle (4) that spring is housed, and the axle that mercury cut-off (3) is arranged in plate washer upward and with axle intersects 90 °.As shown in Figure 2.When coal passes through the coal lock, plate washer (5) thus turn one angle is connected mercury cut-off (3) under the coal thrust, when no coal passes through, plate washer in vertical state, mercury cut-off disconnects, mistake start and distortion that the coal position measuring point of Bu Zhiing can be avoided attacking because of striking fully like this, factors such as the humidity of vibrations, coal, grain size cause.The lead-in wire that stretches out in two mercury cut-offes links to each other with amplifier (6), the input end of (7) Fig. 3 respectively, the output terminal of amplifier (6), (7) links to each other with the input end of flash alarm (9), and another output terminal of the amplifier of one of amplifier (7) links to each other with an input end of amplifier (8).Amplifier (6), (7) have been received coal or have not been had the coal signal, and make flash alarm (9) make corresponding actions after handling, as shown in Figure 4, following coal position red light (11) is bright, green light (14) puts out, then expression does not down have coal in the coal position, and amplifier this moment (8) closes message register (10) after receiving the no coal signal that amplifier (7) transmits, thereby has avoided false coal amount accumulation and Error processing; Following coal position red light (11) puts out, and green light (14) is bright, and then expression has coal in the coal position down, at this moment message register (10) continuous counter.In like manner go up the bright also corresponding last coal position state of having represented of putting out of coal position green light (13) and last coal position red light (14).

So, the stoker just just can accurately judge and understand coal position coal amount information from the alarm dial plate, thereby it is flame-out to have stopped burner hearth, phenomenons such as unstable combustion, guaranteed the safe and economical boiler operation, solved the difficult problem that existing mesolow even high-temperature high-pressure boiler coal position coal amount detect, application value has been arranged very much.

Embodiment and description of drawings.

Fig. 1 is upper level sensor structure and position synoptic diagram.(1) is spring among the figure, and (2) are lever, and (3) are mercury cut-off, and (15) are the coal bunker wall.

Fig. 2 is the next sensor construction synoptic diagram.(3) are mercury cut-off among the figure, and (4) are rotating shaft, and (5) are the baffle-type lever.

Fig. 3 is described coal meter amount alarm functional-block diagram.(16) are upper level sensor among the figure, and (17) are following level sensor, and (6), (7), (8) are amplifier, and (9) are flash alarm, and (10) are message register.

Fig. 4 is an alarm dial plate synoptic diagram.(12) are last coal position red light among the figure, and (11) are following coal position red light, and (13) are last coal position green light, and (14) are following coal position green light.

Fig. 5 is the circuit diagram of one of coal described in the utility model position amplifier (6), (7) example circuit.

Fig. 6 is the circuit diagram that flash alarm described in the utility model (9) is implemented one of circuit.

Claims

A kind of steam coal amount alarm comprises coal site sensor, amplifier, coal meter record instrument, and it is characterized in that: the coal site sensor of described alarm is a kind of gravitational displacement formula sensor, is made of lever, spring and mercury cut-off; Its coal position check point divides height two places to arrange; For high-order measuring point, this measuring point is arranged near coal bunker coal charge porch, one spring (1) is housed on the coal bunker wall, lever (2) is a straight-bar, one end stretches into coal bunker, the other end is equipped with mercury cut-off (3) and is linked together with spring (1), for the low level measuring point, this measuring point is arranged between boiler furnace inlet coal lock and the burner hearth, and be a plate washer (15) as the lever of sensor, this baffle-type lever can swing around its axle (4) that spring is housed, and the axle that mercury cut-off (3) is contained in plate washer upward and with axle intersects 90 ° of angles; The lead-in wire that stretches out in two mercury cut-offes links to each other with the input end of amplifier (6), (7) respectively, the output terminal of amplifier (6), (7) links to each other with the input end of flash alarm (9), and another output terminal of the amplifier of one of amplifier (7) links to each other with an input end of amplifier (8).