CN105092300A

CN105092300A - Method for automatic collection of ash sample at ash discharge port of coal-fired boiler dry type dust remover

Info

Publication number: CN105092300A
Application number: CN201510298177.9A
Authority: CN
Inventors: 王金铭; 解海龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-06-03
Filing date: 2015-06-03
Publication date: 2015-11-25

Abstract

A method for automatic collection of an ash sample at an ash discharge port of a dry type dust remover is mainly used for collection of a coal-fired boiler combustion product-the fly ash sample; the method can avoid a lot of shortcomings of poor sample representative, tube blocking and low device reliability of a traditional flue sampling method. The method is characterized in that a sampling point is removed to an outlet below an ash dropping hopper of the first-level dry type dust remover from a flue, the fly ash at the outlet is automatically extracted according to the detection required quantity and time interval by a power-driven or pneumatic way and is delivered to a testing instrument, and online testing of the combustible substance content or other components in the boiler fly ash is carried out.

Description

A kind of method automatically gathering ash sample at coal-burning boiler dry collector ash hole

Technical field

The present invention relates to a kind of large coal-fired boiler products of combustion---the automatic method of sampling of flying dust, the method will be used for the on-line checkingi of combustible content or other composition in boiler fly ash.

Background technology

Can in on-line checkingi products of combustion, the combustible content of flying dust be the important evidence that coal-burning boiler Optimizing Combustion controls, collect the key that representational ash sample is detection by Automatic continuous.Traditional sampling mode and limitation as follows:

1, common feature is that sampled point is arranged in flue (normally at flue outlet place), extracts and obtains ash sample through being separated, belong to " point type " sampling from the flue gas of flowing.Due on flue structure, sample point does not have enough straight lengths, under the effect of and centrifugal force uneven at flow velocity, and flying dust concentration and particle diameter skewness on flue xsect, therefore the sample representativeness of single-point acquiring is poor; Again because flying dust is in dilute phase state in flue gas, in detachment process, lose a part again, the last sample representativeness obtained is declined further;

2, owing to extract and in detachment process, temperature reduces and makes the moisture that contains in flue gas separate out, be attached to together with ash on sampling tube wall and cause plugging, often make Sampling interrupt;

3, because sampled point is on flue, this place belongs to boiler high temperature, high dust, high vibration area, and the checkout equipment belonging to exact instrument can not away from layout, therefore make it be in extremely severe working environment, and reliability and serviceable life decline to a great extent.

For the above reasons, make that such Product checking credible result degree is poor, plant maintenance amount is large, be difficult to continuous operation, its due effect can not be played.

Summary of the invention

In order to overcome the shortcoming of traditional sampling method, the present invention proposes a kind of brand-new method of sampling.

The technical scheme of the technical matters that the method will solve and employing is: sampled point is moved to one-level dry collector (electrostatic or sack cleaner) ash dropping hopper lower exit port place, select a kind of sampling apparatus, flying dust herein is automatically extracted according to the quantity and the time interval detecting needs and is transported to detecting instrument place.

The sampled part of sampling apparatus extend into ash hole inside, and extracting mode can take the following two kinds mode to realize automatic sampling:

1, pneumatic mode: utilize pneumatic negative pressure generator (or same principle design device) extracted by ash sample and be transported to detecting instrument place, through gas ash content from after for checking;

2, motor machine mode: by driven by motor screw, scraper plate or other physical construction, pushes out by ash sample and is transported to detecting instrument place again for inspection.

The beneficial effect that the present invention brings is:

1, electrostatic or bag-type dust are dedusting methods most effective at present, the flying dust of more than 90 ~ 95% is captured, blending focus on ash dropping hopper ash hole place, " total cross-section " sampling is belonged in the sampling of this place, sample population uniform particle sizes, and the loss that ash sample does not almost cause because of separation, sample representativeness is obviously better than flue sampling;

Containing moisture, not there is not plugging problem in the flying dust 2, after fly-ash separator is separated;

The environment of 3, dedusting workplace is obviously better than near flue, and place is spacious, is convenient to the layout of detecting instrument, operation and maintenance, and equipment dependability and serviceable life are increased substantially.

So far, instant invention overcomes the shortcoming of traditional sampling mode, coordinate original detecting instrument can realize reliably, combustible content continuously in on-line checkingi boiler fly ash.

Accompanying drawing explanation

Fig. 1 is the position schematic diagram of the present invention at fly-ash separator ash hole sampled point.

Fig. 2, Fig. 3 are sampled part two kinds of heteroid structural representations in Fig. 1, respectively: pneumatic sampled part schematic diagram and motor machine sampled part schematic diagram.

In figure: 1. flying dust 3. ash dropping hopper of fly-ash separator ash dropping hopper 2. after dedusting exports 4. sampled part 5. ash sample 6. pressurized air 7. and sample the outlet of funnel 8. ash dropping hopper outlet wall 9. jet pipe 10. diffuser pipe 11. screw 12. motor 13. sampling scraper piston 14. toggle 15. ash sample.

Embodiment

Below in conjunction with drawings and Examples, the present invention is further described.

As shown in Figure 1: the upper perforate of the wall (8) in outlet (3) appropriate location, place of dry collector ash dropping hopper (1), sampled part (4) is inserted, making its front end sample funnel (7) is embedded in the flying dust after dedusting (2), and sample unit (4) and ash dropping hopper export wall (8) joint portion and seal fixing.

Sampling process can have two kinds of embodiments because the structure of sampled part (4) is different with power:

1, pneumatic sample mode

As shown in Figure 2: when pressurized air (6) is by jet pipe (10), negative pressure is formed in its exit, flying dust (2) is sucked by sampling funnel (7) and is mixed with pressurized air (6) and enters diffuser pipe (9), after diffuser pipe (9) supercharging, leave sample unit (4), after being separated, becoming ash sample (5) being supplied to detecting instrument.The switch controlling pressurized air valve (such as solenoid valve) on demand just can realize continuously for detecting instrument provides the process of ash sample.

2, motor machine sample mode

As shown in Figure 3: drive screw (11) or toggle (14) by motor (12), due to the rotation of screw (11) or the to-and-fro movement of sampling scraper piston (13), the flying dust (2) falling into sampling funnel (7) is pushed to ash sample outlet (15), and falling into crucible becomes ash sample (5) and is supplied to detecting instrument.The start and stop controlling motor (12) on demand just can realize continuously for detecting instrument provides the process of ash sample.

Claims

1. a large coal-fired boiler products of combustion---the method for sampling of flying dust, it is characterized in that: in the exit perforate of dry collector ash dropping hopper, the sampled part installing particular design automatically can gather ash sample on demand and be supplied to the detection that detecting instrument carries out combustible content or other composition.

2. the method for sampling according to claim 1, is characterized in that: sampled part extend into inside by ash dropping hopper exit apertures, and extracting mode can take pneumatic or motor machine two kinds of modes to realize automatic sampling.