CN204881184U - Sintering process air mass flow's on -line measuring device - Google Patents

Abstract

The utility model discloses a sintering process air mass flow's on -line measuring device belongs to the sintering technique field. The utility model discloses a be provided with the kuppe in the air mass flow on -line measuring device, be provided with a plurality of sub - kuppes in this kuppe side by side to set up air detector in sub - kuppe, the gasket bottom the kuppe seals the kuppe. During the use, hanging the kuppe and putting on sintering pallet's charge level, then the kuppe removes along with sintering pallet, starts air detector simultaneously and carries out the compartment detection, obtains the mean flow rate and the temperature parameters of air, realizes the direct detection purpose. The utility model discloses the kuppe simple structure who sets up, convenient to use can direct detection to air mass flow and temperature parameters, has improved sintering machine thermal balance analysis results's accuracy.

Description

A kind of on-line measuring device of sintering process air mass flow

Technical field

The utility model relates to sintering technology field, more particularly, relates to a kind of on-line measuring device of sintering process air mass flow.

Background technology

Sintering is the leading production technology of China's iron mineral powder agglomeration, is a ring important in whole Steel Production Flow Chart.The material treating capacity of sintering circuit is in second in integrated iron and steel works, is only second to blast furnace ironmaking, and energy resource consumption is also only second to ironmaking and steel rolling and occupy the 3rd, is one of maximum operation of Commodity flow in modern steel manufacturing process, energy flow circulation.Reduction sintering plant revamp is the important topic in SINTERING PRODUCTION, and be also the important channel reducing sintering deposit cost, in sintering circuit, thermal energy consumption accounts for about 80%, is energy-conservation main direction.

In order to evaluate the heat utilization level of sintering machine, specify energy saving direction, improve thermal regulation and the device structure of sintering machine, understand the relation of material composition and material structure situation and thermal energy consumption, quantitatively by the heat energy distribution classification of sintering process, find out main thermal energy consumption and invalid thermal energy consumption, reduce energy consumption, domestic and international agglomerant author carries out sintering process Thermal Balance and evaluation work one after another.But the air capacity in sintering process, as the important parameter of in heat Balance Calculation, is but that dependency theory calculates, and is difficult to be detected by reality obtain always.

Mostly theory calculate is to be calculated by the product of chemical reaction, and in the bed of material, solid-fuelled complete burning degree is relevant with several factors with the oxidation reaction degree of ferrous oxide in compound, so the theoretical air requirement of sintering process cannot accurately calculate.In addition, the carbon element Thorough combustion in fuel will be made in sintering process, the amount of actual air for combustion entered above pallet sinter bed is needed to have certain excessive, and the actual air entering the bed of material depends on bed permeability, bed depth and sintering vacuum, lack assay method accurately always, also can not calculate by the method for excess air coefficient.Be the increment such as catabolite, carbon monoxide and the igniting exhausted air quantity that calculate sintering process by measuring the exhausted air quantity of flue collector and air leak rate of air curtain traditionally, indirect calculation goes out to enter the air capacity in the bed of material.But as everyone knows, air leakage rate of sintering machine evaluated error is comparatively large, and gained air capacity is only an approximation, and this directly affects the accuracy of sintering machine Thermal Balance result.

Through retrieval, China Patent No. ZL:200810146263.8, authorized announcement date: on July 21st, 2010, this application case discloses a kind of detection method and detection system of ignition furnace discharge gas flow quantity, comprises gas flow and the air mass flow of test point stove; Detect the pressure in the burner hearth of described ignition furnace and atmospheric pressure differential, by the absolute value sqrt of described pressure differential, the data obtained are as the described flow that leaks out, calculate the amount of oxygen needed for fuel gas buring of a normal flow unit and generate gas flow, a normal flow unit is added required amount of oxygen, deduct generation gas flow again, the difference obtained is the gas flow consumed, with described gas quantity and air mass flow and the gas flow that leaks out flow and consumption described in deducting, obtain exhaust gas flow.The program only gives the air mass flow of igniting section, and still needs to calculate multiple parameter theory to carry out flow measurement, is difficult to reflect real air inflow.

Utility model content

1. the utility model technical problem that will solve

The purpose of this utility model is to overcome in prior art and lacks the deficiency that checkout gear directly can measure air mass flow, provide a kind of on-line measuring device and detection method thereof of sintering process air mass flow, the technical solution of the utility model, set kuppe structure is simple, easy to use, air mass flow and temperature parameter can be directly detected, improve the accuracy of sintering machine Thermal Balance result.

2. technical scheme

For achieving the above object, the technical scheme that the utility model provides is:

The on-line measuring device of a kind of sintering process air mass flow of the present utility model, comprise kuppe and air detection instrument, the sub-kuppe composition that described kuppe is set up in parallel primarily of at least 4, described air detection instrument is arranged in sub-kuppe and detects the air flowing through sub-kuppe.

Further improve as the utility model, the bottom lengths of described kuppe and the width of pallet match, and make kuppe cover sinter bed on the width of pallet.

Further improve as the utility model, bottom described kuppe, surrounding is provided with diaphragm seal, the flexible heat resistant sheet that sealing sheet is structure as a whole or be consecutively arranged to form by least 4 flexible heat resistant sheets.

Further improve as the utility model, the air inlet pipe of described sub-kuppe primarily of top and the hood composition of bottom.

Further improve as the utility model, the air inlet pipe of described sub-kuppe primarily of top and the hood composition of bottom, the cross section of described air inlet pipe is circular or rectangle, and hood is the cone-shaped hood that osculum end is connected with air inlet pipe or the rectangular cover be connected with air inlet pipe by changeover portion.

Further improve as the utility model, the internal diameter of described air inlet pipe is D, and intake manifold length is at least 12D.

Further improve as the utility model, the distance on described air detection instrument distance air inlet pipe top is 0.50 ~ 0.75 times of air inlet pipe total length.

3. beneficial effect

The technical scheme adopting the utility model to provide, compared with prior art, has following beneficial effect:

(1) on-line measuring device of a kind of sintering process air mass flow of the present utility model, its kuppe is set up in parallel by multiple sub-kuppe and forms, after air enters the air inlet pipe of sub-kuppe, flow velocity is accelerated, be convenient to the measurement of flow velocity, and cross section is that in circular air inlet pipe, air velocity is more evenly distributed; Air detection instrument is provided with in the air inlet pipe of sub-kuppe, the distance on air detection instrument distance air inlet pipe top is 0.50 ~ 0.75 times of air inlet pipe total length, namely be positioned at the middle and lower part of air inlet pipe, ensure the uniformity of air detection instrument place place air velocity, it is more accurate to measure;

(2) on-line measuring device of a kind of sintering process air mass flow of the present utility model, bottom kuppe, surrounding is provided with diaphragm seal, sealing sheet is made up of flexible heat resistant sheet, can prevent the leakage of hood inner air or extraneous air from entering, ensure the sealing of measurement environment, improve accuracy in detection;

(3) on-line measuring device of a kind of sintering process air mass flow of the present utility model, use it can directly detect air velocity, temperature parameter, and obtain air mass flow and air themperature by the method that mass data is averaging, compared to theory calculate, improve the accuracy of sintering machine Thermal Balance result, and measuring process is simple, without the need to transforming existing equipment, cost is low, is convenient to implement.

Accompanying drawing explanation

Fig. 1 is the structural representation of the on-line measuring device of a kind of sintering process air mass flow of the present utility model;

Fig. 2 is the arrangement architecture schematic diagram of the utility model neutron kuppe;

Fig. 3 is the using state figure of kuppe in the utility model;

Fig. 4 is the structural representation of the sub-kuppe with cone-shaped hood.

Label declaration in schematic diagram: 1, pallet; 2, bellows are sintered; 3, ignition furnace; 4, kuppe; 5, sub-kuppe; 51, air inlet pipe; 52, changeover portion; 53, rectangular cover; 54, cone-shaped hood; 6, flexible heat resistant sheet; 7, air detection instrument.

Detailed description of the invention

For understanding content of the present utility model further, in conjunction with the accompanying drawings and embodiments the utility model is described in detail.

Embodiment 1

Composition graphs 1 and Fig. 2, the on-line measuring device of a kind of sintering process air mass flow of the present embodiment, primarily of compositions such as kuppe 4 and air detection instrument 7, during use, kuppe 4 is placed on the sinter bed in the middle part of pallet 1, is detected the air mass flow flowed through by air detection instrument 7.Kuppe 4 in the present embodiment forms primarily of the sub-kuppe 5 that at least 4 are set up in parallel, concrete number can carry out selection design according to the width of used pallet 1, the bottom lengths of kuppe 4 and the width of pallet 1 match, and make kuppe 4 cover sinter bed on the width of pallet 1.The present embodiment is described this programme to be provided with 4 sub-kuppes 5, and 4 sub-kuppes 5 are set up in parallel along same straight line, its length close to pallet 1 dual-side between width.

Referring to Fig. 4, the air inlet pipe 51 of the sub-kuppe 5 in the present embodiment primarily of top and the hood composition of bottom, the cross section of air inlet pipe 51 is circular, and hood is the cone-shaped hood 54 that osculum end is connected with air inlet pipe 51, and cone-shaped hood 54 is positive tetragonous cone table structure.The cross section of air inlet pipe 51 also can be rectangular configuration, but circular structure, air velocity can be accelerated in air inlet pipe 51 1 aspect of circular configuration, the wall of another aspect air inlet pipe 51 and the contact of air evenly, can not cause the air velocity skewness in same cross section and be unfavorable for flow-speed measurement because of friction.In order to make the air detection instrument 7 be arranged in sub-kuppe 5 accurately can record air parameter, making air detection instrument 7 be 0.55 times of air inlet pipe 51 total length apart from the distance on air inlet pipe 51 top, being namely positioned at position on the lower side, middle part.After air is entered by air inlet pipe 51 top, flow velocity is still in variable condition, and more stable at position on the lower side flow velocity, and it is also just more accurate to measure.

In addition, the change of independent pursuit flow velocity and reduce caliber sintering feed will be made can not to absorb enough air capacities, cause sintering thorough, measured data also just truly can not reflect actual air consumed cabin air amount, not there is researching value, therefore the present embodiment limits the specification of air inlet pipe 51.The internal diameter of air inlet pipe 51 is D, then air inlet pipe 51 length is at least 12D, selects air inlet pipe 51 length of 12D, in this case, not only can ensure the requirement of flow velocity and uniformity, can also meet sintering feed required air quantity in the present embodiment.

Embodiment 2

Referring to Fig. 1, Fig. 2 and Fig. 3, the on-line measuring device of a kind of sintering process air mass flow of the present embodiment, its basic structure is identical with embodiment 1, its difference is: in the present embodiment, kuppe 4 is set up in parallel in the same direction by 8 sub-kuppes 5 and forms, and the internal diameter of air inlet pipe 51 is D, and air inlet pipe 51 length is 16D, air detection instrument 7 is arranged on distance air inlet pipe 51 for 10D position, find through test of many times, air velocity is more stable in this case, and measurement result is also more accurate.In addition, in order to make the air velocity of sinter bed more stable, the hood arranged is the rectangular cover 53 be connected with air inlet pipe 51 by changeover portion 52, the cross section of rectangular cover 53 is square, because the upper lower section of rectangular cover 53 is identical, less on air velocity impact, more press close to the Detection results of time of day.

What deserves to be explained is, enter to prevent air leakage or extraneous air in kuppe 4, bottom kuppe 4, surrounding is provided with diaphragm seal, sealing sheet is the flexible heat resistant sheet 6 of fiberglass needled mat material, the flexible heat resistant sheet 6 of a slice corresponding length is all set in every side of kuppe 4, ensure the sealing of measurement environment, improve accuracy in detection.

Embodiment 3

The on-line measuring device of a kind of sintering process air mass flow of the present embodiment, its basic structure is identical with embodiment 2, its difference is: in the present embodiment, the internal diameter of air inlet pipe 51 is D, and air inlet pipe 51 length is 18D, and air detection instrument 7 is arranged on distance air inlet pipe 51 for 12D position.Diaphragm seal is consecutively arranged to form by the flexible heat resistant sheet 4 identical with rectangular cover 53 width.Due to sinter bed surface irregularity, the diaphragm seal structure result of use of segmented is better, can not affect the sealing at other positions because the part bed of material is protruding.Because sinter bed surface contacts with air, temperature is generally within 200 DEG C, and the material of the flexible heat resistant sheet 4 used is the one in Mei Tasi Nomex or fluorine this Nomex beautiful.If sinter bed temperature is higher than 200 DEG C, the flexible heat resistant sheet 4 of other materials can be selected to substitute and to use, to obtain certain service life.

The online test method of a kind of sintering process air mass flow of the present utility model, uses the on-line measuring device of above-mentioned sintering process air mass flow to detect, the steps include:

Step one, set air mass flow on-line measuring device in the sampling parameter of air detector 7, such as detection time is spaced apart Δ t, and air detection instrument 7 can according to time interval automatic data collection;

Step 2, when pallet 1 shifts out from ignition furnace 3, just with driving, kuppe 4 is hung onto on the charge level in the middle part of pallet 1, kuppe 4 covers sintering feed, and flexible heat resistant sheet 6 touch sintering feed and seals, prevent inner air and outer air from altering logical, start air detection instrument 7 simultaneously and detect;

Step 3, kuppe 4 are with pallet 1 synchronizing moving, and because the sintering bellows 2 of pallet 1 bottom are constantly being bled, sinter bed inside is negative pressure state, and then air by kuppe 4 to sinter bed flowing, can reach measurement object; Air detection instrument 7 detects the air parameter in sub-kuppe 5 by setting-up time interval, comprises air velocity, air themperature;

When step 4, pallet 1 move to the afterbody of last sintering bellows 2, kuppe 4 is sling, close air detection instrument 7 simultaneously;

Step 5, the air parameter that step 4 detects to be calculated by formula, obtain air mass flow Q and sintering process average temperature of air T _all, computing formula is:

Calculate Q, $Q=\stackrel{\‾}{\frac{Q}{P}}\×\frac{L\×W}{l\×w},\stackrel{\‾}{Q}=\frac{1}{n}\underset{i=1}{\overset{n}{\Σ}}{Q}_i,Q_i=\underset{j=1}{\overset{m}{\Σ}}{V}_{ji}\×F\×60\×60;$

Calculate T _all,

Wherein, Q-sintering process air flow amount, m ³/ t;

Q _i-by the i-th period air average discharge of kuppe, m ³/ h;

by the air average discharge of kuppe in-all detection periods, m ³/ h;

V _jii-th period air mean flow rate in the sub-kuppe air inlet pipe of-jth #, m/s;

The air inlet pipe cross-sectional area of F-sub-kuppe, m ²;

The number of the sub-kuppe arranged in m-kuppe;

N-detecting in the period data group number measured;

L-kuppe bottom lengths, m;

W-kuppe bottom width, m;

L-from ignition furnace to rear of sintering machine length, m;

W-sintering pallet width, m;

P-sintering machine unit-hour output, t/h;

T _allaverage temperature of air in-sintering process, DEG C;

T _ji-the i-th detects the air inlet air in tube mean temperature of period by the sub-kuppe of jth #, DEG C;

T _i-the i-th detects the average temperature of air in period whole kuppe, DEG C.

Calculate in sintering process air flow amount formula and mainly first obtain mean flow rate V _ji, to the air average discharge summation in every sub-kuppe air inlet pipe, obtain the air average discharge Q in same detection period whole kuppe _i, then the air mass flow of all detection periods is averaging and obtains and then sintering process air flow amount Q can be obtained.T _allcomputing formula mainly first to the average temperature of air in every sub-kuppe air inlet pipe, be weighted on average according to its mean flow rate, obtain the same average temperature of air T detected in period whole kuppe _i, then the air themperature of all detection periods is averaging and obtains sintering process air temperature T _all.

To adopt 8 sub-kuppes, air detection instrument distance air inlet pipe top is 10D, apart from being 5D bottom it, is described scheme in conjunction with design parameter, and the basic parameter of equipment is as table 1, but actual use is not limited to this parameter:

The parameters of table 1 detection example

D,m	F,m 2	l,m	w,m	L,m	W,m	Δt,s	N, group	P,t/h
									0.3	0.071	4.4	0.55	73	4.4	10	163	426.74

Note: D is air inlet pipe internal diameter cross-sectional diameter;

Δ t is the assay intervals time.

Every measured value of table 2 detection example and calculating data

Note: V _1i-8ifor the i-th period air mean flow rate in 1# ~ 8# air inlet pipe;

T _1i-8ifor the i-th period average temperature of air in 1# ~ 8# air inlet pipe.

Calculate according to above-mentioned formula, then:

Sintering process air mass flow: $Q=\stackrel{\‾}{\frac{Q_i}{P}}\×\frac{L\×W}{l\×w}=\frac{2543}{426.74}\×\frac{73\×4.4}{4.4\×0.55}=791.01m^3/t;$

Sintering process average temperature of air:

The sintering process air mass flow calculated by the air parameter detected compares the accuracy that theoretical amount more can reflect sintering machine Thermal Balance result with average temperature of air, and set kuppe structure is simple, just can realize installing by driving handling and place, do not need to carry out large-scale redevelopment to original device structure, method is simple, be easy to implement, achieve the object completing high accuracy and detect under low cost drops into, for sintering machine Thermal Balance and calculating and improve sinter bed uniformity of laterally breathing freely and lay a good foundation.

Schematically above be described the utility model and embodiment thereof, this description does not have restricted, and also just one of the embodiment of the present utility model shown in accompanying drawing, actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from the utility model and creating aim, design the frame mode similar to this technical scheme and embodiment without creationary, protection domain of the present utility model all should be belonged to.

Claims (7)

1. the on-line measuring device of a sintering process air mass flow, it is characterized in that: comprise kuppe (4) and air detection instrument (7), sub-kuppe (5) composition that described kuppe (4) is set up in parallel primarily of at least 4, described air detection instrument (7) is arranged in sub-kuppe (5) and detects the air flowing through sub-kuppe (5).

2. the on-line measuring device of a kind of sintering process air mass flow according to claim 1, it is characterized in that: the bottom lengths of described kuppe (4) and the width of pallet (1) match, and make kuppe (4) cover sinter bed on the width of pallet (1).

3. the on-line measuring device of a kind of sintering process air mass flow according to claim 1, it is characterized in that: described kuppe (4) bottom surrounding is provided with diaphragm seal, the flexible heat resistant sheet (6) that sealing sheet is structure as a whole or be consecutively arranged to form by least 4 flexible heat resistant sheets (6).

4. the on-line measuring device of a kind of sintering process air mass flow according to any one of claims 1 to 3, is characterized in that: the air inlet pipe (51) of described sub-kuppe (5) primarily of top and the hood composition of bottom.

5. the on-line measuring device of a kind of sintering process air mass flow according to claim 4, it is characterized in that: the cross section of described air inlet pipe (51) is for circular, and hood is the cone-shaped hood (54) that osculum end is connected with air inlet pipe (51) or the rectangular cover (53) be connected with air inlet pipe (51) by changeover portion (52).

6. the on-line measuring device of a kind of sintering process air mass flow according to claim 5, is characterized in that: the internal diameter of described air inlet pipe (51) is D, and air inlet pipe (51) length is at least 12D.

7. the on-line measuring device of a kind of sintering process air mass flow according to claim 5, is characterized in that: the distance on described air detection instrument (7) distance air inlet pipe (51) top is 0.50 ~ 0.75 times of air inlet pipe (51) total length.