CN105181519A

CN105181519A - Rotary arm type ash sample transfer mechanism for on-line detection of fly ash carbon content by weight loss method

Info

Publication number: CN105181519A
Application number: CN201510479571.2A
Authority: CN
Inventors: 王金铭; 解海龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-07
Filing date: 2015-08-07
Publication date: 2015-12-23

Abstract

The invention relates to a rotary arm type ash sample transfer mechanism for on-line detection of fly ash carbon content by weight loss method. The mechanism is characterized in that it has a cantilever with front end able to lift and hold a crucible, under the control of a computer, the cantilever can perform lifting and rotation action driven by electricity and (or) air to transfer the crucible to each station, so that all fly ash carbon content detection steps can completed parallelly. The mechanism provided by the invention is also provided with a standby bracket, and when the crucible is damaged or lost, the standby crucible on the bracket can be taken for use by the cantilever automatically. By applying the transfer mechanism provided by the invention, the detection frequency can be doubled, and at the same time the detection interruption caused by crucible damage is avoided. The invention provides more reliable basis and timely regulation effect feedback for optimization of combustion control, effectively improves the regulation accuracy, and ensures that the boiler unit can always operate under a most economical and low nitrogen oxide emission state.

Description

A kind of swing-arm type ash sample transfer mechanism of weight-loss method on-line checkingi unburned carbon in flue dust

Technical field

The present invention relates to the swing-arm type ash sample transfer mechanism in a kind of weight-loss method on-line checkingi unburned carbon in flue dust device, apply this mechanism and can improve sample detection frequency, and can avoid because of crucible damage, testing process being interrupted.

Background technology

Unburned carbon in flue dust is the important indicator of reflection large coal-fired boiler performance driving economy, is also that Optimizing Combustion and low-nitrogen oxide discharging control indispensable foundation.Therefore, this index of on-line checkingi just seems particularly important.According to Principle of Statistics, sampling and higher to the detection frequency of sample, accuracy and the confidence level of testing result are higher.But, detect frequency except the step restriction being subject to testing process and must fulfiling, be also subject to the impact of ash sample transfer mechanism.Weight-loss method detects the detecting step of unburned carbon in flue dust: sample-weigh-calcination-at least 6 steps such as waste sample and supporting process of weighing again-remove, relate to sampling, weigh, calcination, 4 stations such as removing.Therefore, need a transfer mechanism ash sample to be transported to different stations and complete respective process.What existing testing agency adopted usually is " disk-crown bar bracket " formula mechanism, is made up of two parts: one is the liftable disk rotated by driven by motor, disk has several circular holes be used for laying the crucible of splendid attire ash sample; It two is that pneumatic or electronic liftable crown bar bracket is positioned at below each station.Disk often turns an angle, just crucible is delivered to next station, and crucible in place is lifted to corresponding station through circular hole and completed corresponding detecting step by crown bar bracket.Said mechanism is in actual moving process, as long as there is a station unfinished work, because push rod is now just through the circular hole on disk, so disk can not rotate, and ash sample is delivered to next station, namely each detecting step can only be connected and be carried out.In testing process, except calcination step needs the long period (>=8 minutes), other detecting step all can complete in two minutes.Therefore, the shortest sense cycle of existing testing agency is 6 step required time sums, that is:

Sense cycle=sampling (2 minutes)+(2 minutes)+calcination (>=8 minutes) of weighing+weigh again (2 minutes)+removing waste sample (2 minutes)+other supporting process (> 0 minute) > 16 minutes

Improve detection frequency, just must increase the detection number of times of unit interval, and existing testing agency carries out due to its each testing process series connection, can not increase detection number of times again in the shortest sense cycle.

In addition, because crucible is consumables, once damage, need artificial supplementation, this will have to detection is interrupted.

Summary of the invention

Detecting frequency to improve, avoiding the detection caused because of crucible damage to interrupt, the present invention proposes a kind of solution of liftable swing-arm type ash sample transfer mechanism.

The technical scheme of the technical matters that the method will solve and employing is: each station crown bar bracket retains, and replaces disc type mechanism with liftable swing-arm type mechanism.This mechanism can hold up with a front end and place the cantilever of crucible, it can be under the control of the computer, be elevated and spinning movement by electronic and (or) pneumatic, for crucible is transplanted on each station, each detecting step of unburned carbon in flue dust walked abreast.In addition, increase a crucible for concurrent working and two analog brackets, this bracket is used for depositing crucible temporarily and laying crucible for subsequent use.Specific works principle is as follows:

1, concurrent working

When an ash sample is in the calcination process period, another ash sample be temporary on newly-increased analog bracket can be transplanted on other station and complete all the other detecting steps by spiral arm.Therefore, within original detection period, add one-time detection process, thus detection frequency is doubled;

2, automatically crucible is supplemented

When systems scan is to crucible damage, spiral arm can obtain the crucible for subsequent use deposited in advance immediately to another newly-increased analog bracket, has continued testing, thus avoids detection interruption.

The beneficial effect that the present invention brings is: improve and detect frequency one times, avoids the detection interruption because crucible damage causes simultaneously.For Combustion System provides foundation and timely regulating effect feedback more reliably, effectively improve the precision of regulation and control, ensure that boiler controller system runs all the time under most economical work and low-nitrogen oxide discharging state.

Accompanying drawing explanation

Accompanying drawing is the swing-arm type ash sample transfer mechanism schematic diagram that the present invention relates to.

In figure: 1. calcination station 2. samples the interim bracket 4. weighing station 5. cantilever mechanism 6. bracket 7. ash discharge station for subsequent use of station 3..

Embodiment

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

1, ash sample course of conveying following (see accompanying drawing):

Before a, operation, original state is: three crucibles are positioned on sampling station 2, interim bracket 3 and bracket for subsequent use 6 respectively;

B, first operation: the crucible obtaining ash sample at sampling station 2 place is transported to weighing station 4 and weighs by spiral arm 5, then the ash sample after weighing is delivered to calcination station 1 calcination; Sampling station 2 delivered to by crucible on interim bracket 3 by spiral arm 5 more successively, weighing station 4 completes sampling, weighing process, delivers to sampling station 2 afterwards and deposits temporarily, be in the standby condition before calcination;

C, continuously operation phase: the ash sample that calcination on calcination station 1 completes by spiral arm 5 takes out and is placed on interim bracket 3, then send ash sample sampling station 2 being in standby condition into calcination station 1 and carry out calcination;

During calcination, the ash sample be placed on interim bracket 3 after calcination is delivered to weighing station 4 by spiral arm 5 respectively, ash discharge station 7 completes and again weigh and get rid of waste sample process;

Then, get rid of the empty crucible after waste sample by spiral arm 5 delivers to sampling station 2 successively, weighing station 4 completes a new round sampling, weighing process, deliver to again sampling station 2 afterwards and deposit temporarily, be in the standby condition before calcination.

The on-line continuous realizing boiler flyash carbon content that so moves in circles detects.

2, crucible process is supplemented as follows:

When systems scan is to crucible damage or when losing, the crucible for subsequent use be positioned on bracket 6 for subsequent use can take off by spiral arm 5, then continues to run.After crucible for subsequent use is taken, system sends prompting, is supplemented on new crucible for subsequent use to bracket 6 for subsequent use by operations staff when patrolling and examining.

The transfer of above spiral arm 5, place and take off that action sends instruction by the pick-up unit control system embedding steering logic of the present invention, the push rod of collaborative electronic and (or) pneumatic actuator and each station, analog bracket complete.

By above embodiment, achieve to improve and detect frequency and on-line automatic supplementary crucible.

Claims

1. a liftable swing-arm type ash sample transfer mechanism, it is characterized in that this mechanism can hold up with a front end and place the cantilever of crucible, this cantilever can be under the control of the computer, be elevated and spinning movement by electronic and (or) pneumatic, this mechanism is used for crucible to be transplanted on each station, every detecting step of the collaborative unburned carbon in flue dust that walked abreast.

2. liftable swing-arm type ash sample transfer mechanism according to claim 1 realizes on-line automatic supplementary corrupted or lost crucible by the mode of taking crucible for subsequent use to bracket for subsequent use.