Unit type intelligent gas pulse ash blower and its control method

Abstract

The cellular intelligent gas pulse ash blower for boiler consists of main path apparatus and shunt apparatus. The main path apparatus includes main fuel gas source, main air source, flow controller, fuel gas distributor and air distributor. The shunt apparatus includes shunt pressure detector, shunt arrestor, shunt mixer, shunt igniter, shunt detector and generator. One controller is used in controlling both the main path apparatus and the shunt apparatus simultaneously. The control method of the present invention has the features the real-time monitoring, the timely control, high precision, etc.

Description

Technical field: [0001] The invention relates to an automatic control device, in particular to an automatic unit type intelligent gas pulse soot blowing device used in the soot blowing process of a boiler. Background technique: [0002] The current status of pulse soot blowing technology in the field of boiler soot blowing technology: [0003] 1. Basic principles: [0004] The gas source is composed of two gas sources, one is combustible gas, and the other is air. The two channels of gas are controlled to merge to form a mixed gas, which arrives and is stored in the generator. After charging for a specific time, it is estimated or calculated that the volume ratio and quantity of the mixed gas of the generator are appropriate. When it can work, it will ignite, and the flame will be accelerated to the generator through the pipeline. , Shock wave, through the nozzle to direct the energy as much as possible to the heat exchange surface of the ash, so as to remove various types of ash...

AI Technical Summary

Problems solved by technology

[0020] 1. If the mixing chamber is too close to the main gas source of combustible gas, the gas transmission distance is long, and tempering control is difficult;

[0021] 2. There is a lack of safety protection buffer level on the gas passage, and it is very easy to endanger the main gas source and cause a major accident when the mixing chamber tempers.

[0022] 3. The air supply of each branch is controlled by the pulse valve of the main circuit. When the mixing chamber backfires, the main pulse valve can close the gas only when all the branches connected to the distributor have been blown out of soot. In this way, The more pipelines connected to the distributor, the longer the main gas supply time, and the longer the burning time when backfire occurs, especially when the temperature control device fails, it is more likely to cause a major safety accident

[0023] 4. In addition, the series structure cannot isolate faults automatically, and the continuous operation capacity is inversely proportional to the number of soot blowing branches

[0032] 1. There are too many parts;

[0033] 2. If there are more external leakage points of combustible gas, the fault points will also increase greatly, that is to say, if there are more tempering points, the internal leakage points will also increase;

[0034] 3. The chances of internal leakage, dumb explosion and external leakage are greatly increased;

[0035] 4. After the system fails, the main control system has no means to send information in time and control in time. The reliability, stability, and continuous trouble-free operation ability are greatly reduced. It can only be turned off manually after maintenance and inspection.

When the pressure changes, there is no soot blowing effect and no stabilizing effect

[0039] ②, pressure transmitter, flow transmitter + proportional valve, compared with the above ①, there is an improvement, but the error is very large, because the gas cylinder is filled with combustible gas, the flow law from the full bottle to the empty bottle is different, and the pressure of each pressure is not known in advance The value corresponds to the flow law control, and the dispersion of the mixing ratio is very large, and the actual control is of little significance, and the flow cannot be adjusted by using a proportional valve on the pipeline.

[0040] ③, flow meter + proportional valve, add a flow meter to the combustible gas path or air path, measure the current flow value, adjust the proportional valve according to this value to control the next flow, the actual flow value of the next time will be affected by the pressure change and other factors The flow value has a large dispersion and is extremely unstable

[0041] ④. The operation and management of soot blowing in series or in parallel are all at a very low level

[0043] b. Other values ​​such as sootblowing records, fault records, intensity information, sootblowing sequence skipping arbitrarily in units of roads (or) and fault maintenance management have not been realized; online sootblowing system monitoring is even zero, Fault isolation monitoring is zero

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