CN108837601A - A kind of control method for secondary dedusting system - Google Patents

Abstract

The invention discloses a kind of control methods for secondary dedusting system, and wherein air-introduced machine is connected at least two suction points by pipe network, and pipe network includes the controllable exhaust screen for each sucking point, and the position of the baffle influences the volume flow at sucking point.A kind of control method for secondary dedusting system of the invention, can effectively control the operating of exhaust blower and air-introduced machine.

Description

A kind of control method for secondary dedusting system

Technical field

The present invention relates to dedusting technology field more particularly to a kind of control methods for secondary dedusting system.

Background technique

In the various production processes of a steel plant, dust and the accumulation of toxic exhaust gas are got up, it is assumed that in electric arc furnaces The steel per ton of production only generates 15 kilograms of dust, if it is assumed that a medium-sized steel plant produce 400000 tons of steel every year, often Annual meeting generates 6000 tons of dust discharge amount.In order to protect work human and environment, it is important to siphon away the powder of accumulation on source Dirt discharge amount, this suction must assure that the dust emissions amount of the limits value of workplace is observed, and the observation of these values is It is realized by so-called dust pelletizing system.Dust pelletizing system is divided into primary system and electrical secondary system, and primary dedusting is responsible for handling Dust emission is directly established in machine at scrap melting (for example, in electric arc furnaces), and final dusting is responsible for the dust that processing generates Discharge is counted by being located at corresponding dust source (for example, in converter) being provide with nearby, and this dust pelletizing system is by three Main component composition, i.e. piping network, air-introduced machine and filter chamber.In order to siphon away the dust discharge amount in each place of production, in suction point Defined volume flow is needed, the dust emission concentration that the size of these suction volume flows depends in surrounding air has more Greatly, the vision during and being run by system is estimated to mean to manually adjust by vision estimation and inhale accordingly to determine Volume flow rate at access point.For this purpose, volume flow increases on corresponding suction point in actual production process, pass through people Eye observation discloses all exhaust gas and is all taken away by volume flow.Discharge value near production process is measured, with verifying Volume flow adjusted is enough.If it is, relevant operating parameter (partial vacuum in such as main channel) is drawn In the control system for making and decomposing dust removal process.In order to adjust in different inspiratory points, single blade or (in the feelings compared with Large Diameter Pipeline Under condition) needed for volume flow, multiple blade air exhausters are installed in the pipeline for leading to suction point, can be in its closed position It is moved between 0-100%.Partial vacuum needed for dust pelletizing system is generated by air-introduced machine, this is substantially by two to three key portions Part composition, i.e. impeller, motor and possible fluid-flywheel clutch or frequency converter.Impeller is placed in rotary motion by motor, leaf The geometrical arrangements based on impeller are taken turns, thus ensure that the parital vacuum in pipe network, the ambient pressure generated in pipe network and part Pressure difference between vacuum, which is ensured, generates volume flow on the direction of air-introduced machine.The feedback control of the dust pelletizing system of the prior art Each suction point of method processed is associated with having the feedback control circuit of independently adjustable section nominal value, and feedback control circuit Feedback control procedure needs special sensor, this is complicated and expensive.

Technical solution

The invention mainly solves the technical problem of providing a kind of control method for secondary dedusting system, wherein pipeline Air-introduced machine is connected at least two suction points by network, and wherein piping network includes the controllable exhaust wind for each suction point Door, damper positions influence rate of the volume flow at sucking point, it is characterised in that：The control method includes following step Suddenly：The mathematical system model of description piping network is provided, wherein each duct element is characterized in that its physics and geometrical property； The pressure loss in piping network is calculated according to volume flow needed for completely specified mathematical system model and suction point；It calculates The flap configuration of each exhaust damper and the pressure loss of whole system, needed for this allows to realize with transmission power as small as possible Operational volume flow；Control exhaust damper, it is ensured that calculated damper positions；Air-introduced machine is controlled, its revolving speed is increased, until Reach the calculating pressure loss of whole system, and ensures the volume flow of inspiratory point.

Optionally, physical parameter needed for the piping network is calculated by means of following amount：The flowing is characterized to occur The resistance coefficient of duct element, the geometrical property of the duct element that occurs of fluid, the duct element flowed heat transfer system Number, and the volume flow for passing through duct element

The beneficial effects of the invention are as follows：

A kind of control method for secondary dedusting system of the invention can effectively control exhaust blower and air-introduced machine Operating.

Embodiment

The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.

New control concept according to the present invention is the idea based on the mathematical model for forming secondary dedusting system, and is being mentioned It is calculated with the help of the plant data of confession, on the basis of these calculating, the air exhauster of system is moved to corresponding position It sets, the revolving speed of air-introduced machine increases to the pressure loss of the whole system generated in this way from original resting position, reaches Calculate the level of loss of total pressure.

For the control method of secondary dedusting system, wherein air-introduced machine is connected at least two suction points by piping network, Wherein piping network includes the controllable exhaust damper for each suction point, and damper positions influence volume flow at sucking point Rate, control method includes：1, the mathematical system model of description piping network is provided, wherein the feature of each duct element exists In its physics and geometrical property；2, the volume flow according to needed for completely specified mathematical system model and suction point calculates pipeline The pressure loss in network；3, the flap configuration of each exhaust damper and the pressure loss of whole system are calculated, this allows with to the greatest extent Transmission power that may be small realizes required operational volume flow；4, exhaust damper is controlled, it is ensured that calculated damper positions；5, Air-introduced machine is controlled, increases its revolving speed, until reaching the calculating pressure loss of whole system, and ensures the volume flow of inspiratory point Amount.

The sequencing of above embodiments is not only for ease of description, represent the advantages or disadvantages of the embodiments.

Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that：It still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features； And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (2)

1. a kind of control method for secondary dedusting system, wherein air-introduced machine is connected at least two suctions by piping network Point, wherein piping network includes the controllable exhaust damper for each suction point, and damper positions influence volume flow and sucking Rate at point, it is characterised in that：The control method includes the following steps：

1. the mathematical system model of description piping network is provided, wherein each duct element is characterized in that its physics and geometry are special Property；

2. calculating the pressure damage in piping network according to volume flow needed for completely specified mathematical system model and suction point It loses；

3. calculating the flap configuration of each exhaust damper and the pressure loss of whole system, this allows with conveying function as small as possible Rate realizes required operational volume flow；

4. controlling exhaust damper, it is ensured that calculated damper positions；

5. controlling air-introduced machine, increases its revolving speed, until reaching the calculating pressure loss of whole system, and ensure the body of inspiratory point Product flow.

2. a kind of control method for secondary dedusting system according to claim 1, it is characterised in that：By means of following Amount calculates physical parameter needed for the piping network：Characterize resistance coefficient, the fluid of the duct element that the flowing occurs The heat transfer coefficient of the geometrical property of the duct element of generation, the duct element flowed, and the volume for passing through duct element Flow.