CN202255482U - Automatic monitoring system of blast volume - Google Patents

Abstract

The utility model discloses an automatic monitoring system of blast volume, which includes a blower for producing the blast volume, a throttling gear used for measuring the blast volume and connected with the blower through a gas pipeline, a transmitter used for converting differential pressure produced by the throttling device into electric signals and connected with the throttling device through a guiding pipe; a first-level intelligent digital flow meter electrically connected with the transmitter and used for converting and calculating the differential pressure signals transmitted by the transmitter, so as to produce the differential power, the flow rate and the temperature value of the detailed blast volume, and a second-level intelligent digital flow meter electrically connected with the first-level intelligent digital flow meter. The automatic monitoring system of the blast volume can effectively monitor the blast volume and the aeration volume going into the aeration tank, so as to detect the flow rate and the pressure of multi-path air all the time, and facilitate improving the quality of sewage treatment.

Description

Blow rate required automatic monitoring system

Technical field

The utility model relates to technical field of sewage, is specifically related to the blow rate required automatic monitoring system in a kind of sewage disposal process.

Background technology

Oily sludge mainly results from oil field and refinery, and the oil-field development major part is to adopt early-stage waterflooding to keep the method for reservoir pressure at present.Degree of depth exploitation along with the oil field; Extraction Water in oil rate is increasingly high, thereby in carrying out the dehydration of crude oil, there are a large amount of oily sludges in bottoms such as water knockout, oil tank, slop oil tank; Simultaneously in the oil field, the attached sewage-farm of refinery (at the bottom of like oil interceptor, flotation cell, aeration tank etc.) also exist a large amount of oily sludges; These mud compositions are complicated, generally form by oil-in-water (O/W), Water-In-Oil (W/O) and suspended solid, and fully emulsified; Viscosity is difficult to sedimentation more greatly, thereby in production and environmental protection, produces great harmfulness.In recent years; The processing of oily sludge receives much attention; Generally adopt landfill abroad, disperse to execute cultivated, concentrate that drying and incinerating, microbiological treatment, chemosetting are handled, chemical oxidation degraded, chemical solvent clean, though these methods have obtained corresponding effects to the processing of sewage.But; In the processing procedure of sewage; There is very big influence in factors such as the WGR in the water, temperature sludge volume, recoil time, aeration pressure to sewage treatment effect, and also do not have the complete suitable technique of a cover that factors such as WGR, temperature sludge volume, recoil time, aeration pressure are monitored in the existing technology.

Summary of the invention

The purpose of the utility model provides a kind of blow rate required automatic monitoring system; This system is in sewage disposal process; Constitute an aeration tank blow rate required automatic monitoring system; This system can effectively monitor the blow rate required and the aeration rate that get into the aeration tank, thereby the flow of each road air, pressure etc. are detected constantly, is beneficial to the quality of raising wastewater treatment.

The technical scheme that realizes the utility model purpose is following:

Blow rate required automatic monitoring system comprises the fan blower that produces the blow rate required;

And the restriction device that the blow rate required is measured, this restriction device is connected with fan blower through gas pipe line;

And changing the pressure reduction that restriction device produces the transmitter of electric signal into, this transmitter is connected with restriction device through guiding tube;

And the first order intelligent digital flow instrument that is electrically connected with transmitter, the pressure difference signal process that this first order intelligent digital flow instrument is sent transmitter here is changed and is calculated, and produces poor power, flow and the temperature value of concrete air quantity;

And the second level intelligent digital flow instrument that is electrically connected with first order intelligent digital flow instrument.

The automatic monitoring system of the utility model has following functional characteristic:

(1) automatic monitoring function: as long as through panel required function is suitably selected, system just can carry out single channel or multichannel itinerant monitor system automatically, relies on the medium options button, can select eight kinds of measured mediums to measure.

(2) automatic compensation function: some measured medium (like saturated vapour, superheated vapor etc.), density is along with the variation of pressure and temperature changes.According to the difference of medium, can distinguish the selection pressure compensation, temperature compensation or pressure and temperature be compensation automatically simultaneously.

(3) preparatory function: be provided with a keypad in the system, can date of actual measurement, time, canonical parameter etc. be inserted in the internal storage at any time, use when relatively reaching timed print.

(4) off-limit alarm function: when instantaneous or integrated flux surpassed the bound scope of setting, system can in time provide alerting signal, reminded operating personnel to handle.

(5) power-off protection function: in the flow instrument set inside power-off protecting circuit is arranged, when disconnection fault takes place when, the automatically starting standby power supply, parameter of having inserted before this and cumulative flow value can not lost.About six months of guard time.

(6) automatic Presentation Function: six light-emitting diode displays all are housed on two-stage measuring instrument panel can go the rounds to show pressure reduction, force value, instantaneous delivery and cumulative flow value, indication range from 000000 to 999999 can realize switching fixing or that circulation shows through patrolling and examining button.The function that also has artificial zero clearing and automatic clear.

(7) automatic printing function: institute of system band miniprinter is printable to go out parameters such as differential pressure value, force value, temperature flow value, cumulative flow value, date, time.Printing type can be selected to print at any time or two kinds of timed prints.

(8) automatic control function: can the instantaneous delivery value be gone control executing mechanism through the 0-10mA direct current signal, thereby replace traditional regulator.

In sum, this system can effectively monitor the blow rate required and the aeration rate that get into the aeration tank, thereby the flow of each road air, pressure etc. is accomplished know what's what, and has improved the quality of wastewater treatment greatly.This system is metered into from detection that show to print all be to carry out automatically, thereby has improved the real-time, reliability, agility of system works, practiced thrift manpower and materials greatly.Under the serious environmental pollution situation of in the face of the current ubiquity of China, this system is little with its investment, the plurality of advantages such as high, easy for operation of producing effects.

Below in conjunction with accompanying drawing and embodiment utility model is done further explanation.

Description of drawings

Fig. 1 is the structural representation of the automatic monitoring system of the utility model;

Fig. 2 is the circuit block diagram of first order intelligent digital flow instrument;

In the accompanying drawing, 10 is fan blower, and 20 is restriction device, and 21 is gas pipe line; 30 is transmitter, and 31 is guiding tube, and 40 is first order intelligent digital flow instrument; 41 is A/D converter, and 42 is single-chip microcomputer, and 43 is KYBD/display-interface; 44 is light-emitting diode display, and 50 is second level intelligent digital flow instrument, and 60 is printer.

Embodiment

With reference to Fig. 1 and Fig. 2; The blow rate required automatic monitoring system of the utility model; This system is made up of fan blower 10, restriction device 20, transmitter 30, first order intelligent digital flow instrument 40, second level intelligent digital flow instrument 50 and printer 60; Below in conjunction with the aeration tank, respectively the effect and the annexation between the each several part of every part are carried out detailed explanation:

The blow rate required in the Monitoring and Controlling aeration tank can be adjusted the dissolved oxygen DO in the aeration tank, makes wastewater treatment reach optimum efficiency.The blow rate required of the automatic monitoring system aeration tank of the utility model relies on the fan blower 10 of two 55kW to replace air feed, is sent to 4 restriction devices respectively through four pipelines.

Restriction device 20 is for No. four blows rate required that get into the aeration tank are measured, and this restriction device is connected with fan blower through gas pipe line 21.In native system, four groups of throttling orifice plates that can form differential pressure have been selected for use.When the gas stream that is full of gas pipe line through pipeline and when arriving throttling orifice plate, stream is local contraction at the throttling orifice plate place, thereby flow velocity is increased, static pressure reduces, so before and after throttling orifice plate, just produced pressure reduction p, the calculating formula of difference difference is following:

p＝p ₁-p ₂

P in the formula ₁Be the pressure before the throttling orifice plate;

p ₂Be the pressure behind the throttling orifice plate;

P is the pressure reduction at throttling orifice plate place of flowing through;

This pressure reduction changes along with the flow size, and the flow of flow media is big more, and the pressure reduction that before and after throttling orifice plate, produces is also just big more.Thereby, just can weigh the size of fluid flow through measuring pressure reduction, this measuring method is the basis with energy conservation law and mobile continuity law, according to Bernoulli equation and mobile continuity equation, the fundamental equation that can derive flow is:

$q_v=\mathrm{\π}/4\·\mathrm{\α}\·\mathrm{\ϵ}\·d^2\sqrt{2p/{\mathrm{\ρ}}_1},$

$q_m=\mathrm{\π}/4\·\mathrm{\α}\·\mathrm{\ϵ}\·d^2\sqrt{2p/{\mathrm{\ρ}}_1},$

In the formula: q _v---the volumetric flow rate of fluid, m ³/ s;

q _m---the mass rate of fluid, kg/s;

The opening diameter of d---orifice plate, m;

α---coefficient of flow;

The expansion coefficient of ε---medium;

The pressure reduction of p---restriction device, Pa;

ρ ₁---the density under the restriction device upstream side duty, kg/m ³.

Can draw according to aforesaid equation, after fluid and throttling orifice plate were confirmed, volumetric flow rate, mass rate had certain quantitative relation with the pressure difference of orifice plate front and back.

Transmitter 30 changes the pressure reduction that restriction device 20 produces into electric signal, and this transmitter 30 is connected with restriction device through guiding tube 31.Adopt four electronic differential pressure transmitters of DBC-240 type in the system, be connected to the output terminal of four throttling orifice plates respectively.The pressure reduction P that is produced by throttling orifice plate causes four differential pressure transmitters through two guiding tubes 31 respectively, through the normalized current signal of differential pressure transmitter conversion back output 0-10mA, this current signal is sent into the intelligent digital flow instrument monitor demonstration.

The first order intelligent digital flow instrument 40 that the output terminal of transmitter 30 is electrically connected, the pressure difference signal process that this first order intelligent digital flow instrument is sent transmitter here is changed and is calculated, and produces poor power, flow and the temperature value of concrete air quantity.Have four single first order intelligent digital flow instruments in the automatic monitoring system of the utility model, respectively corresponding four transmitters 30.As shown in Figure 2, this first order intelligent digital flow instrument comprises: the analog signal conversion that transmitter is sent is the A/D converter 41 of digital signal; And the single-chip microcomputer 42 that is electrically connected with A/D converter, this single-chip microcomputer will come from that the electric signal of A/D converter is sampled, scale transformation and calculating.And a KYBD/display-interface 43 that is connected in the microcontroller communication buffer output terminal, the output terminal of this KYBD/display-interface connects a light-emitting diode display 44.

The working method of first order intelligent digital flow instrument is: first order intelligent digital flow instrument at first (comprises pressure with the pressure reduction that transmitter is sent here; Temperature etc.) signal is through A/D converter 41 transfer standard voltage signals; Then through single-chip microcomputer sampling, scale transformation; Computing formula and medium compensation formula according to instantaneous and integrated flux calculate; Pressure difference, force value, temperature value, instantaneous delivery value, the cumulative flow value of computing gained are delivered to display buffer and communication buffer district, both can show instantaneous delivery to the four measuring loop, also can show integrated flux through four groups of 6 light-emitting diode displays.The switching of the two leans on " instantaneous ", " accumulation " switching push button on the panel to accomplish.

If do not consider the influence to medium of pressure, temperature variation, when only importing differential pressure signal and measuring flow, practical flow formula is:

$q_v=K_2\sqrt{p},$

$q_m=K_1\sqrt{p},$

In the formula: q _v---volumetric flow rate, m ³/ h;

q _m---mass rate, kg/h;

$k_1-q_{m\max }/\sqrt{p_{\max }}$

$K_2-q_{v\max }/\sqrt{p_{\max }}$

q _Mmax---design biggest quality flow value, kg/h;

p _Max---design maximum differential pressure value, MPa;

q _Vmax---design maximum volume flow value, m ³/ h;

H---differential pressure, MPa.

The second level intelligent digital flow instrument 50 that first order intelligent digital flow instrument 40 is electrically connected.Said second level intelligent digital flow instrument is the intelligent digital flow instrument of DJZ-05 type.Second level intelligent digital flow instrument is used for itinerant monitor system, the instantaneous delivery value of demonstration four tunnel and their accumulated value.Through patrolling and examining and locking press button on the panel, both can carry out itinerant monitor system and show, may be locked in certain again on the way.

This monitoring system also comprises a printer 60, and this printer 60 is electrically connected on the output terminal of second level intelligent digital flow instrument.Utilize print button on intelligent digital flow instrument 50 panels of the second level to print at any time and patrol and examine the result, in time grasp monitoring result so that operating personnel to be provided.

Claims (7)

1. blow rate required automatic monitoring system is characterized in that, comprises the fan blower that produces the blow rate required;

And the restriction device that the blow rate required is measured, this restriction device is connected with fan blower through gas pipe line;

And changing the pressure reduction that restriction device produces the transmitter of electric signal into, this transmitter is connected with restriction device through guiding tube;

And the first order intelligent digital flow instrument that is electrically connected with transmitter, the pressure difference signal process that this first order intelligent digital flow instrument is sent transmitter here is changed and is calculated, and produces poor power, flow and the temperature value of concrete air quantity;

And the second level intelligent digital flow instrument that is electrically connected with first order intelligent digital flow instrument.

2. blow rate required automatic monitoring system according to claim 1 is characterized in that: said restriction device is a throttling orifice plate.

3. blow rate required automatic monitoring system according to claim 1 is characterized in that: said transmitter is the electronic differential pressure transmitter of DBC-240 type.

4. blow rate required automatic monitoring system according to claim 1 is characterized in that: said first order intelligent digital flow instrument comprises: the analog signal conversion that transmitter is sent is the A/D converter of digital signal; And the single-chip microcomputer that is electrically connected with A/D converter, this single-chip microcomputer will come from that the electric signal of A/D converter is sampled, scale transformation and calculating.

5. blow rate required automatic monitoring system according to claim 4; It is characterized in that: said first order intelligent digital flow instrument also comprises a KYBD/display-interface that is connected in the microcontroller communication buffer output terminal, and the output terminal of this KYBD/display-interface connects a light-emitting diode display.

6. blow rate required automatic monitoring system according to claim 1 is characterized in that: said second level intelligent digital flow instrument is the intelligent digital flow instrument of DJZ-05 type.

7. according to any described blow rate required automatic monitoring system of claim 1 to 6, it is characterized in that: this monitoring system also comprises a printer, and this printer is electrically connected on the output terminal of second level intelligent digital flow instrument.

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