CN204389336U - Serosity density measurement system - Google Patents
Serosity density measurement system Download PDFInfo
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- CN204389336U CN204389336U CN201520112205.9U CN201520112205U CN204389336U CN 204389336 U CN204389336 U CN 204389336U CN 201520112205 U CN201520112205 U CN 201520112205U CN 204389336 U CN204389336 U CN 204389336U
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- 238000001739 density measurement Methods 0.000 title claims abstract description 30
- 238000011010 flushing procedure Methods 0.000 claims abstract description 115
- 238000005070 sampling Methods 0.000 claims abstract description 102
- 239000002002 slurry Substances 0.000 claims abstract description 74
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 59
- 235000019738 Limestone Nutrition 0.000 claims abstract description 20
- 239000006028 limestone Substances 0.000 claims abstract description 20
- 229920002472 Starch Polymers 0.000 claims abstract description 19
- 235000019698 starch Nutrition 0.000 claims abstract description 19
- 239000008107 starch Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 210000002966 serum Anatomy 0.000 claims description 13
- 238000000034 method Methods 0.000 description 45
- 238000005259 measurement Methods 0.000 description 35
- 238000012423 maintenance Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 17
- 238000006477 desulfuration reaction Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 230000023556 desulfurization Effects 0.000 description 8
- 238000009434 installation Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 230000008520 organization Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The utility model discloses a kind of serosity density measurement system, this system comprises: lime stone slurry differential pressure measurement equipment and opertaing device; Lime stone slurry differential pressure measurement equipment comprises: slurry pipe line enter that slurry place arranges enter to starch sampling valve after for vertical section slurry pipe line, it is arranged the first perforate and the second perforate; Low-pressure side sampling line one end is connected to the first perforate, and the other end is connected to differential pressure transmitter negative pressure end; Sampling line one end, high-pressure side is connected to the second perforate, and the other end is connected to the positive pressure side of differential pressure transmitter; Flushing line water inlet place arranges flushing main valve, and the first flushing line is connected to high-pressure side sampling line one end near differential pressure transmitter; Second flushing line is connected to low-pressure side sampling line one end near differential pressure transmitter; Sampling line and flushing line arrange differential pressure five valve group; Opertaing device, for sending valve opening and closing instruction, receives each valve state and differential pressure signal, and record display density value.Solve the susceptible to plugging problem of sampling line.
Description
Technical field
The utility model relates to serosity density measurement technical field, particularly relates to a kind of serosity density measurement system.
Background technology
For the wet desulfurization system that fuel-burning power plant is conventional, its desulfurization generally adopts wet method limestone-gypsum method flue gas desulfurization technique, design density measure has 3 places, is middle grinder slurry case density, lime stone slurry case density and absorption tower outlet gypsum slurries density respectively.Desulfurization slurry density measure whether accurate, is related to the conversion ratio of SO2, i.e. desulfuration efficiency, is more related to fume emission whether meet the requirement of environmental protection.Therefore lime stone slurry density measure must be accurate, for unit operation and environmental protection supervisory department provide reliable data.
But in practical sulphur removal serosity density measurement process, because the technological process of wet desulfurization system is comparatively loaded down with trivial details, measuring equipment work under bad environment, simultaneously the composition of slurries own and characteristic more complicated, cause problems and difficulty to density measure.Such as: containing sulfate radical and inferior sulfate radical in (1) slurries, in faintly acid; (2) chlorion in slurries, fluorinion concentration are higher, and corrosivity is stronger; (3) in slurries, the massfraction of solid matter is higher, and general control is 20% ~ 30%, and abrasiveness is stronger; (4) in slurries, the massfraction of solid matter is higher, and flow organization is not good, easily causes solids particles precipitate, blocking table meter.Therefore, desulphurization system slurry solid content is high, perishable, wearing and tearing, blocking instrument measurement pipe etc., densitometric type selecting is very limited.Serosity density measurement instrument type selecting should take into full account the burn into abrasion of desulfurization slurry, the various factors such as deposition, fouling of suspended solids, takes into account its availability, reliability and controllability as far as possible.
At present, serosity density measurement instrument most widely used in flue gas desulfurization is mass flowmeter, its measuring principle is that measuring tube vibrates with certain resonant frequency continuously, vibration frequency changes with the variable density of fluid, resonant frequency is the function of fluid density, can be obtained the density of fluid by the resonant frequency of measuring tube.The maximum feature of mass flowmeter is can measuring media mass rate and density simultaneously, and measuring accuracy is higher, and measuring process is more stable.
But mass flowmeter has following shortcoming: need to utilize power-equipment outer loop slurries, the therefore complex structure of device, safeguard inconvenience.Because slurry viscosity causes greatly the blocking of measuring tube, often there is latch up phenomenon in mass flowmeter measuring tube in operational process, regularly exit normal density measurement, regular flushing, even cause measuring, maintainer's practical maintenance amount is very large. the corrosivity intrinsic due to slurries and repeatedly washing away, measuring tube is easily worn through, substantial portion power plant need repair or change measuring tube for 6 to 8 months, but the intrinsic parameter designing of the measuring tube after repairing changes, be difficult to again realize normal measurement.
Therefore, the installation cost of mass flowmeter is higher, and operation and maintenance cost is higher, and serviceable life is shorter, easy to wear, runs and easily scraps because of abrasion less than 1 year.For the actual maintenance of certain power plant, the spare part that this factory every platform 600MW unit causes every year and maintenance cost are up to 200,000 yuan.Operating maintenance maintenance workload and operation cost pressure all larger.
In addition, can also make alternatively: differential pressure method density measure.Differential pressure method density measure is a kind of mode of indirect inspection density, namely on the pipeline measuring serum density, get at 2 and carry out perforate, the Distance geometry position of 2 must be rationally, stable measurement environment can be created, the positive/negative-pressure side of sampling line access differential pressure transmitter is installed at position of opening, utilizes formula: Δ P=ρ gh carrys out the density of indirect calculation slurries.Wherein, Δ P is the differential pressure of ab point-to-point transmission, and g is acceleration of gravity, and ρ is serum density, and h is the distance of pressure samples position ab point-to-point transmission.Therefore corresponding serum density can be extrapolated by the pressure differential of differential pressure transmitter measurement ab point-to-point transmission.This metering system is adopted by part power plant, and advantage is that input cost is low, wear-resistant and corrosion.
But, Traditional differential pressure method carries out density measure also has some significantly not enough: (1) measuring position condition is poor, if pressure measurement point is comparatively near apart from absorption tower stirrer, then can be subject to the interference of stirrer, cause pressure measuring value to fluctuate large, lose the meaning of measurement; If comparatively far away apart from stirrer, apparatus measures hole is easily blocked by crystal, even if adopt penetration type flange, is also difficult to ensure long-play.(2) measuring error is large, if two pressure measurement point distances are too near, then pressure reduction is very little, is difficult to Measurement accuracy, and is easily disturbed; If the distance is too far, then the density difference of point-to-point transmission is comparatively large, does not possess representativeness.Therefore to carry out the measuring accuracy of density measure not high for Traditional differential pressure method, and stopple coupon Louis blocks.
Utility model content
The utility model provides a kind of serosity density measurement system, and adopt differential pressure method to carry out serosity density measurement at least to solve, measuring accuracy is not high, the susceptible to plugging problem of sampling line.
The utility model embodiment provides a kind of serosity density measurement system, comprising: lime stone slurry differential pressure measurement equipment and opertaing device; Described lime stone slurry differential pressure measurement equipment comprises: slurry pipe line, sampling line, flushing line and differential pressure transmitter; Wherein, the slurry place of entering of described slurry pipe line is provided with into slurry sampling valve, and pulp place connects slurry tank; Along the slurry stream in described slurry pipe line to, described in enter to starch sampling valve after one section of slurry pipe line be vertical section, predeterminable range that described vertical section is separated by sets gradually the first perforate and the second perforate, from top to bottom as sample position; Described sampling line comprises: low-pressure side sampling line and high-pressure side sampling line; One end of described low-pressure side sampling line is connected to described first perforate, and the other end is connected to the negative pressure end of described differential pressure transmitter; One end of described high-pressure side sampling line is connected to described second perforate, and the other end is connected to the positive pressure side of described differential pressure transmitter; Water inlet place of described flushing line arranges flushing main valve; Along the feed water flow in described flushing line to, after described flushing main valve, described flushing line is divided into the first flushing line and the second flushing line, and described first flushing line is connected to described high-pressure side sampling line near one end of described differential pressure transmitter; Described second flushing line is connected to described low-pressure side sampling line near one end of described differential pressure transmitter; Described sampling line and described flushing line are provided with differential pressure five valve group; Described opertaing device comprises: switch board and the main frame be connected with described switch board, wherein, enters to starch sampling valve, described flushing main valve, described differential pressure five valve group and described differential pressure transmitter described in described switch board is connected to respectively; Described opertaing device, for sending valve opening and closing instruction, receives the state of each valve and the signal of described differential pressure transmitter, and record display serum density value.
In one embodiment, described differential pressure five valve group comprises: the first differential pressure measurement valve, the second differential pressure measurement valve, equalizing valve, the first flushing valve and the second flushing valve; Wherein, described first differential pressure measurement valve is arranged on described low-pressure side sampling line; Described second differential pressure measurement valve is arranged on the sampling line of described high-pressure side; Described equalizing valve is arranged between described first differential pressure measurement valve and described second differential pressure measurement valve; Described first flushing valve is arranged on described first flushing line; Described second flushing valve is arranged on described second flushing line.
In one embodiment, entering to starch sampling valve described in is pneumatic valve; Described flushing main valve, described first flushing valve and described second flushing valve are motorized valve; Described first differential pressure measurement valve, described second differential pressure measurement valve and described equalizing valve are hand valve.
In one embodiment, when carrying out slurries sampling, describedly enter to starch sampling valve, described first differential pressure measurement valve, described second differential pressure measurement valve be all in open mode, described equalizing valve, described flushing main valve, described first flushing valve and described second flushing valve are all in closed condition.
In one embodiment, when carrying out serosity density measurement, describedly enter to starch sampling valve, described equalizing valve, described flushing main valve, described first flushing valve and described second flushing valve and be all in closed condition, described first differential pressure measurement valve and described second differential pressure measurement valve are in open mode.
In one embodiment, when rinsing described sampling line, described flushing main valve, described first flushing valve, described second flushing valve, described first differential pressure measurement valve and described second differential pressure measurement valve are all in open mode; Describedly enter to starch sampling valve and described equalizing valve is in closed condition.
In one embodiment, described switch board comprises: programmable logic controller (PLC) (Programmable LogicController, referred to as PLC) switch board or dcs (Distributed Control System, referred to as DCS) switch board.
By serosity density measurement system of the present utility model, flushing line is connected to the side near differential pressure transmitter on sampling line, five new valve group project organization and installation sites, make sampling line rinse relatively more thorough, solve sampling line susceptible to plugging problem when Traditional differential pressure method is measured; The scheme that employing in-site measurement and Long-distance Control combine, sampling, measurement, record data and flushing send opening and closing instruction by opertaing device to valve, and the open and-shut mode of change valve, realization carries out remote auto control, without the need to manual intervention.In addition, system is simple, and cost is low, in use greatly reduces personnel's maintenance workload and maintenance cost, is convenient to promote the use of.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of the serosity density measurement system of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on embodiment of the present utility model, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection domain of the present utility model.
The utility model embodiment provides a kind of serosity density measurement system, and Fig. 1 is the schematic diagram of the serosity density measurement system of the utility model embodiment.As shown in Figure 1, this system comprises: lime stone slurry differential pressure measurement equipment 10 and opertaing device 20.Below its structure is specifically described.
Lime stone slurry differential pressure measurement equipment 10 comprises: slurry pipe line 11, sampling line 12, flushing line 13 and differential pressure transmitter 14 (Differential Pressure Transmitter, referred to as DP);
Wherein, the slurry place of entering of slurry pipe line 11 is provided with into slurry sampling valve V1, and pulp place connects slurry tank; Along the slurry stream in slurry pipe line 11 to, one section of slurry pipe line of entering to starch after sampling valve V1 is vertical section, predeterminable range that vertical section is separated by sets gradually the first perforate (a point) and the second perforate (b point) from top to bottom, as sample position; One section of slurry pipe line of entering to starch sampling valve V1 place can be set to horizontal segment or have certain angle of inclination.
Sampling line 12 comprises: low-pressure side sampling line 121 and high-pressure side sampling line 122; One end of low-pressure side sampling line 121 is connected to the first perforate (a point), and the other end is connected to the negative pressure end of differential pressure transmitter 14; One end of high-pressure side sampling line 122 is connected to the second perforate (b point), and the other end is connected to the positive pressure side of differential pressure transmitter 14;
Water inlet place of flushing line 13 is arranged rinses main valve V2; Along the feed water flow in flushing line 13 to, flushing main valve after, flushing line 13 is divided into the first flushing line and the second flushing line, and the first flushing line is connected to high-pressure side sampling line 122 one end (b1 point) near differential pressure transmitter 14; Second flushing line is connected to low-pressure side sampling line 121 one end (a1 point) near differential pressure transmitter 14;
Sampling line 12 and flushing line 13 are provided with differential pressure five valve group (as V3, V4, V5, V6 and V7 in Fig. 1);
Opertaing device 20 comprises: switch board 21 and the main frame 22 be connected with switch board 21, and wherein, switch board 21 is connected to into slurry sampling valve V1 respectively, rinses main valve V2, differential pressure five valve group and differential pressure transmitter 14; Opertaing device 20, for sending valve opening and closing instruction, receives the state of each valve and the signal of differential pressure transmitter 14, and record display serum density value.Such as, valve receives out code, then valve-off; Receive open command, then Open valve, thus, can according to the state of valve (open or close) to carry out slurries sampling, serosity density measurement and flushing sampling line.
By the serosity density measurement system of above-described embodiment, flushing line is connected to the side near differential pressure transmitter on sampling line, sampling line is rinsed relatively more thorough, solve sampling line susceptible to plugging problem when Traditional differential pressure method is measured; Adopt the scheme that in-site measurement and Long-distance Control combine, sampling, measurement, record data and flushing process send opening and closing instruction by opertaing device to valve, and the open and-shut mode of change valve realizes remote auto and controls, without the need to manual intervention.In addition, system is simple, and cost low (valve group can make full use of the original equipment of power plant and carry out design and installation), in use greatly reduces personnel's maintenance workload and maintenance cost, be convenient to promote the use of.
At present, in order to prevent stopple coupon blocked, introduce wash-down water through rinsing main valve V2, routinely five valve group designs, general meeting is at the root of stopple coupon, namely a point in Fig. 1 and b point install flushing valve additional, but this kind of way is after a lot of implementation in power plant, run a period of time, stopple coupon is blocked, cause differential pressure transmitter to measure, rinse stopple coupon and need artificial treatment, time-consuming effort.
In one embodiment, differential pressure five valve group comprises: the first differential pressure measurement valve V5, the second differential pressure measurement valve V6, equalizing valve V7, the first flushing valve V3 and the second flushing valve V4; Wherein, the first differential pressure measurement valve V5 is arranged on low-pressure side sampling line; Second differential pressure measurement valve V6 is arranged on the sampling line of high-pressure side; Equalizing valve V7 is arranged between the first differential pressure measurement valve V5 and the second differential pressure measurement valve V6; First flushing valve V3 is arranged on the first flushing line; Second flushing valve V4 is arranged on the second flushing line.
As can be seen here, the present embodiment changes valve group project organization and the installation site of Traditional differential pressure method, sampling line is rinsed relatively more thorough, not easily blocks.
In one embodiment, entering to starch sampling valve V1 is pneumatic valve; Flushing main valve V2, the first flushing valve V3 and the second flushing valve V4 are motorized valve; First differential pressure measurement valve V5, the second differential pressure measurement valve V6 and equalizing valve V7 are hand valve.Flushing valve in Traditional differential pressure method is hand valve, in the present embodiment, flushing valve is motorized valve, thus Long-distance Control can be carried out to flushing flow journey, using flushing flow process as the part in whole measurement procedure, measure an auto-flushing once, avoid sampling line blocked, and reduce manual intervention.
When installing for the first time, utilizing the first differential pressure measurement valve V5, the second differential pressure measurement valve V6 and equalizing valve V7 carries out fundamental measurement and calibration.In the process of whole sampling, measurement, record data and flushing, the first differential pressure measurement valve V5 and the second differential pressure measurement valve V6 is in open mode always, and equalizing valve V7 is in closed condition always.
In one embodiment, when carrying out slurries sampling, enter to starch sampling valve V1, the first differential pressure measurement valve V5, the second differential pressure measurement valve V6 be all in open mode, equalizing valve V7, rinse main valve V2, the first flushing valve V3 and the second flushing valve V4 is all in closed condition.Equalizing valve V7 only opens when the integral device initial stage puts into operation and repair and maintenance uses, and all the other times are all in closed condition.During sampling, flushing valve is all in closed condition, avoids clean water to enter pipeline, affects serum density, and then affect measurement result.
In one embodiment, when carrying out serosity density measurement, enter to starch sampling valve V1, equalizing valve V7, flushing main valve V2, the first flushing valve V3 and the second flushing valve V4 are all in closed condition, the first differential pressure measurement valve V5 and the second differential pressure measurement valve V6 is in open mode.To be slurries complete measuring in the process flowed in pipeline in traditional differential pressure method measurement, differential pressure poor stability, and greatly, precision is low in the serum density value fluctuation extrapolated according to differential pressure change.In the present embodiment, based on the serosity density measurement system of said structure, by changing the state of valve, continuity measurement is changed into intermittent measurement (process operator is also intermittent to the adjustment of lime stone density), on this basis, adopt static measurement, namely after lime stone slurry is full of sampling line, sampling line is then stopped to enter slurries, and can time delay be passed through, after slurries in pipeline to be sampled are stable, sampled data (i.e. differential pressure) is sent to opertaing device, to record and to show serum density value.Because interference during sampling is few, differential pressure transmitter accurately can reflect differential pressure value, then improves the precision of the serum density value after conversion.Through overtesting, under same operating mode, compared with the serum density value that the serum density value adopting static measurement to obtain and mass flowmeter record, numerical value difference is within 1%, more existing differential pressure method is described, static measurement precision based on the serosity density measurement system of said structure is higher, meets technique request for utilization completely, solves the problem that Traditional differential pressure method density measurement accuracy is low efficiently.
In one embodiment, when rinsing sampling line, flushing main valve V2, the first flushing valve V3, the second flushing valve V4, the first differential pressure measurement valve V5 and the second differential pressure measurement valve V6 are all in open mode; Enter to starch sampling valve V1 and equalizing valve V7 is in closed condition.
Above-mentioned switch board 21 can be PLC control cabinet, also can be DCS switch board.In actual applications, can arrange according to existing equipment situation, use PLC control cabinet, better compatible.
From above-described embodiment, the utility model provides a kind of new differential pressure method valve group project organization and installation site, sampling line is rinsed relatively more thorough, not easily blocks.Meanwhile, based on the structure of above-mentioned serosity density measurement system, can static measurement be adopted, improve measuring accuracy.In addition, opertaing device can change the open and-shut mode of valve by instruction, and then carries out Long-distance Control to whole measurement procedure (comprising sampling, measurement, record data and flushing), realizes full automatic measurement, without the need to thinking intervention, alleviate the workload of staff.
In order to more clearly explain above-mentioned serosity density measurement system, be described below in conjunction with specific embodiment, but it should be noted that this embodiment is only to better the utility model is described, do not form and the utility model is limited improperly.
(1) according to shown in Fig. 1, the installation of on-the-spot valve group is carried out.
Concrete, limestone slurry liquid pipeline is installed be used for lime stone slurry differential pressure measurement enter slurry sampling pneumatic valve V1, after pneumatic valve, at right angle setting 1 overlaps lime stone slurry stopple coupon.A point on sampling line and b point perforate (for ease of survey calculation, the distance between ab 2 can be set to 1.2m), a, b 2 by differential pressure measurement valve V5 and V6 respectively as sample position slurries being delivered to differential pressure transmitter positive/negative-pressure side.Between V5 and V6, arrange an equalizing valve V7, V5, V6 and V7 are designed to hand valve.When normal measurement runs, V5, V6 open, and V7 closes.V7 only opens when the integral device initial stage puts into operation and repair and maintenance uses.
This programme adopts novel flushing valve design, passes into wash-down water at the opposite side (a1 and the b1 point namely in Fig. 1) of stopple coupon by flushing valve (V3 and V4).Normal developing valve is the same with equalizing valve V7 is all designed to hand valve, motorized valve is designed in this programme, realize remote auto to control, the important sub-process process of flushing controlled as a whole is considered, thus thoroughly eliminates the blocked problem of stopple coupon.
Adopt differential pressure transmitter DP to be used for lime stone slurry to measure.
Thus, above-mentioned valve, pipeline and differential pressure transmitter, set up into lime stone slurry spot measurement device.
(2) Long-distance Control part: adopt the autonomous control system such as PLC or DCS, pass through general processor, or digital signal processor, or application-specific integrated circuit ASIC, or field programmable gate array, or discrete gate, or transistor logic realizes, and adopt hardwire or connect based on MODBUS communications protocol.
The successive control system of PLC system or DCS is utilized to carry out the design of differential density all automatic measurement flow process, all valve sets of Long-distance Control site survey systems and equipment, what automatically realize lime stone slurry sampling bypass enters the functions such as the auto-flushing of slurry, density measure, record and relevant device and pipeline, each course of action is all without the need to manual intervention, according to timing Design, circular flow.
In sum, the utility model is according to the application conditions of the characteristic of desulfurization slurry, desulphurization system technological process and measure field reality, propose a kind of new serosity density measurement system, solve the low and susceptible to plugging problem of sampling line of the measuring accuracy of existing differential pressure measurement system.Consider actual maintenance cost simultaneously, while guaranteeing measuring accuracy and stability, greatly reduce maintenance replacement cost and the workload of measuring sensor compared with mass flowmeter.The program is not only and is measured serum density merely, but maintenance and measurement are carried out intensive intelligent processing method by outside sequence control process, finally achieves the intervention of full measurement procedure prosthetic.According to test, the serosity density measurement of this programme is higher than the stability of Traditional differential pressure method, and measuring accuracy, close to the measuring accuracy of mass flowmeter, reaches process monitoring requirement, and the blocked phenomenon of sampling line does not occur.
The beneficial effects of the utility model are as follows:
(1) problem that Traditional differential pressure method measuring accuracy is low is solved.Based on new serosity density measurement system architecture, continuity measurement is changed into intermittent measurement, process operator is also intermittent to the adjustment of lime stone density, on this basis, adopt static measurement efficient sampling method, namely after lime stone slurry is full of sampling line, sampling line is stopped to enter slurries, and pass through time delay, after slurries in pipeline to be sampled are stable, sampled data is now delivered to DCS and carry out effective density value display, because now sampling system interference is few, differential pressure transmitter accurately can reflect differential pressure value, then improve the precision of the density value after conversion.
(2) thoroughly solve Traditional differential pressure method and measure the susceptible to plugging problem of sampling line.Change valve group project organization and the installation site of Traditional differential pressure method, thoroughly can eliminate the blocked problem of sampling line, and whole flushing process is controlled automatically by opertaing device, without the need to any artificial treatment.Measurement procedure includes flushing flow process completely simultaneously, namely follows measurement auto-flushing principle once, thoroughly eliminates the blockage problem of sampling line and differential pressure transmitter.
(3) incorporate sampling, measurement, record data and the function of flushing, controlled by opertaing device (DCS or PLC system) remote auto, without the need to artificial any operation, when only safeguarding, just need manual intervention.This is that Traditional differential pressure method is unexistent, and the automatic control program designed by DCS system not only achieves accurately measuring of density, and the maintenance of measuring system is also completed by DCS system, and links is all without the need to manual intervention.
(4) scheme global design is simple, cost is low (valve group can make full use of the original equipment of power plant and carry out design and installation), Row control realizability is strong, measuring accuracy is high, in use greatly reduce personnel's maintenance workload and maintenance cost simultaneously, be convenient to promote the use of.Because cost of investment is low, substantially non-maintaining, alternative mass flowmeter, avoids the problem that service property (quality) flowmeter cost is high and maintenance is large, achieves energy-saving and cost-reducing.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; and be not used in restriction protection domain of the present utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. a serosity density measurement system, is characterized in that, comprising: lime stone slurry differential pressure measurement equipment and opertaing device;
Described lime stone slurry differential pressure measurement equipment comprises: slurry pipe line, sampling line, flushing line and differential pressure transmitter;
Wherein, the slurry place of entering of described slurry pipe line is provided with into slurry sampling valve, and pulp place connects slurry tank; Along the slurry stream in described slurry pipe line to, described in enter to starch sampling valve after one section of slurry pipe line be vertical section, predeterminable range that described vertical section is separated by sets gradually the first perforate and the second perforate, from top to bottom as sample position;
Described sampling line comprises: low-pressure side sampling line and high-pressure side sampling line; One end of described low-pressure side sampling line is connected to described first perforate, and the other end is connected to the negative pressure end of described differential pressure transmitter; One end of described high-pressure side sampling line is connected to described second perforate, and the other end is connected to the positive pressure side of described differential pressure transmitter;
Water inlet place of described flushing line arranges flushing main valve; Along the feed water flow in described flushing line to, after described flushing main valve, described flushing line is divided into the first flushing line and the second flushing line, and described first flushing line is connected to described high-pressure side sampling line near one end of described differential pressure transmitter; Described second flushing line is connected to described low-pressure side sampling line near one end of described differential pressure transmitter;
Described sampling line and described flushing line are provided with differential pressure five valve group;
Described opertaing device comprises: switch board and the main frame be connected with described switch board, wherein, enters to starch sampling valve, described flushing main valve, described differential pressure five valve group and described differential pressure transmitter described in described switch board is connected to respectively; Described opertaing device, for sending valve opening and closing instruction, receives the state of each valve and the signal of described differential pressure transmitter, and record display serum density value.
2. system according to claim 1, is characterized in that,
Described differential pressure five valve group comprises: the first differential pressure measurement valve, the second differential pressure measurement valve, equalizing valve, the first flushing valve and the second flushing valve;
Wherein, described first differential pressure measurement valve is arranged on described low-pressure side sampling line; Described second differential pressure measurement valve is arranged on the sampling line of described high-pressure side; Described equalizing valve is arranged between described first differential pressure measurement valve and described second differential pressure measurement valve; Described first flushing valve is arranged on described first flushing line; Described second flushing valve is arranged on described second flushing line.
3. system according to claim 2, is characterized in that, described in enter to starch sampling valve be pneumatic valve; Described flushing main valve, described first flushing valve and described second flushing valve are motorized valve; Described first differential pressure measurement valve, described second differential pressure measurement valve and described equalizing valve are hand valve.
4. system according to claim 2, it is characterized in that, when carrying out slurries sampling, describedly enter to starch sampling valve, described first differential pressure measurement valve, described second differential pressure measurement valve be all in open mode, described equalizing valve, described flushing main valve, described first flushing valve and described second flushing valve are all in closed condition.
5. system according to claim 2, it is characterized in that, when carrying out serosity density measurement, describedly enter to starch sampling valve, described equalizing valve, described flushing main valve, described first flushing valve and described second flushing valve and be all in closed condition, described first differential pressure measurement valve and described second differential pressure measurement valve are in open mode.
6. system according to claim 2, is characterized in that, when rinsing described sampling line, described flushing main valve, described first flushing valve, described second flushing valve, described first differential pressure measurement valve and described second differential pressure measurement valve are all in open mode; Describedly enter to starch sampling valve and described equalizing valve is in closed condition.
7. system according to any one of claim 1 to 6, is characterized in that, described switch board comprises: programmable logic controller (PLC) PLC control cabinet or dcs DCS switch board.
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| CN201520112205.9U CN204389336U (en) | 2015-02-16 | 2015-02-16 | Serosity density measurement system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655527A (en) * | 2015-02-16 | 2015-05-27 | 华北电力科学研究院有限责任公司 | Slurry density measurement system and method |
| CN106568682A (en) * | 2016-11-03 | 2017-04-19 | 上海隧道工程有限公司 | Slurry balanced shield slurry density detecting device and detecting method |
| CN109813630A (en) * | 2017-11-21 | 2019-05-28 | 中蓝连海设计研究院 | A kind of sampling type gradiomanometer and its density measuring method |
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2015
- 2015-02-16 CN CN201520112205.9U patent/CN204389336U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655527A (en) * | 2015-02-16 | 2015-05-27 | 华北电力科学研究院有限责任公司 | Slurry density measurement system and method |
| CN106568682A (en) * | 2016-11-03 | 2017-04-19 | 上海隧道工程有限公司 | Slurry balanced shield slurry density detecting device and detecting method |
| CN106568682B (en) * | 2016-11-03 | 2019-04-02 | 上海隧道工程有限公司 | Slurry balance shield mud density detection device and its detection method |
| CN109813630A (en) * | 2017-11-21 | 2019-05-28 | 中蓝连海设计研究院 | A kind of sampling type gradiomanometer and its density measuring method |
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