CN102590055B - Online measuring device of primary air pulverized coal density of boiler - Google Patents
Online measuring device of primary air pulverized coal density of boiler Download PDFInfo
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- CN102590055B CN102590055B CN 201210027480 CN201210027480A CN102590055B CN 102590055 B CN102590055 B CN 102590055B CN 201210027480 CN201210027480 CN 201210027480 CN 201210027480 A CN201210027480 A CN 201210027480A CN 102590055 B CN102590055 B CN 102590055B
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Abstract
An online measuring device of primary air pulverized coal density of a boiler relates to an online measuring device of pulverized coal density and aims at resolving the problem the existing online measuring device of pulverized coal density is lacked, and is high in construction cost, low in measurement accuracy and the like. An optical fiber beam of the online measuring device are arranged on a primary air pipeline in vertical penetrating mode, a steel pipe is sleeved on the optical fiber beam, a sampling head is provided with a pulverized coal through hole in the axial direction, a samplinghead fixing groove is respectively arranged on two sides of the sampling head in the radial direction, the steel pipe is fixedly installed on the sampling head fixing grooves on two sides of the sampling head, the sampling head is arranged in the middle of the optical fiber beam, a sealing assembly is arranged at the converge position of the primary air pipeline and the steel pipe, a light sourcebox is arranged at one end of the steel pipe, and a light battery box is arranged at the other end of the steel pipe. The online measuring device is especially suitable for online measurement of primary air pulverized coal density of combustion systems with a pulverized coal bin and without pulverized coal bin.
Description
Technical field
The present invention relates to a kind of coal powder density on-line measurement device, be specifically related to boiler concentration of pulverized coal on-line measurement device.
Background technology
The boiler overwhelming majority of generating plant is coal-burning boiler, and coal is ground into coal dust, in the boiler internal combustion.The potpourri of pulverized coal conveying and air is wind of boiler in the boiler.A large power plant boiler has 4-6 wind pipeline simultaneously to boiler input coal dust.When boiler load changed, the coal dust amount of input changed thereupon.Concentration of pulverized coal requires within the limits prescribed, and the excessive or too small safe and economical boiler that all directly affects of coal powder density moves.The coal powder density of each wind pipeline should be consistent, and makes boiler be in best fired state.Therefore, detecting online the boiler concentration of pulverized coal, is vital to the safety and economic operation of coal-burning power plant.But, also do not have so far to supply widely used concentration of pulverized coal on-line measurement device, be a domestic and international long-term unsolved difficult problem.A large amount of research work have been done by China Xi'an hot working research institute, have obtained some scientific payoffss, and a kind of boiler concentration of pulverized coal On-line Measuring Method and measurement mechanism are provided.The method is to measure the flow of a wind and the temperature of a wind, calculates the coal powder density of a wind with the method for calculating heat balance.This measurement mechanism of Xi'an hot working research institute is only applicable to the combustion system of Pulverized Coal Bin, can not be used for directfired installation.This measurement mechanism systematic comparison is complicated.The measuring error of a wind flow and thermometric error all affect the precision that concentration of pulverized coal is measured.The measuring method delay of response of application of heat balance can not react rapidly the conversion of coal powder density, and the concentration of pulverized coal on-line measurement device of Xi'an hot working research institute is failed widespread use so far.
Existing 1,000,000,000 kilowatts of China's generation current installed capacity, the coming five years also will increase by 500,000,000 kilowatts, wherein is the coal-burning power plant more than 70%, the coal-fired billions of tons in annual generating plant.The coal powder density of a wind is excessive or too smallly all directly affect safe and economical boiler operation, and is therefore, low in the urgent need to cost, measure accurately boiler concentration of pulverized coal on-line measurement device.
Summary of the invention
The objective of the invention is in order to solve the problems such as existing boiler concentration of pulverized coal on-line measurement device lacks, cost is high, measuring accuracy is low, in order to ensure safe and economical boiler operation, provide a kind of simple in structure, cost is low, measure accurately boiler concentration of pulverized coal on-line measurement device.
Technical scheme of the present invention is: boiler concentration of pulverized coal on-line measurement device comprises fibre bundle, steel pipe, one or two sampling heads, light source box, photocell box and two seal assemblies, fibre bundle vertically is located on wind pipeline, and wind pipeline is passed at the two ends of fibre bundle one time, steel pipe socket is contained on the fibre bundle, and cementing by heat-resistant adhesive between the inwall of steel pipe and the fibre bundle
When the quantity of sampling head is one,
Sampling head has coal dust vertically by the hole, and the both sides of sampling head radially respectively have a sampling head pickup groove, and steel pipe is packed on the sampling head pickup groove of sampling head both sides, and sampling head is positioned at the middle part of fibre bundle,
When the quantity of sampling head is two,
Each sampling head all has coal dust vertically by the hole, and the both sides of each sampling head radially respectively have a sampling head pickup groove, and steel pipe is packed in respectively on the sampling head pickup groove of sampling head both sides, and two sampling heads are positioned at the middle part of fibre bundle side by side,
The intersection outside of wind pipeline and steel pipe respectively is provided with a seal assembly, one end of steel pipe is provided with light source box, the other end of steel pipe is provided with photocell box, described light source box comprises the light source box end plate, the light source box lid, the light source box shell, the light source box dop, the light source box metal cap, electroluminescent element and light source box insulcrete, the light source box end plate is connected with the end thread of steel pipe one end, the light source box metal cap is packed on the light source box end plate of a relative side with steel pipe, electroluminescent element is packed in the middle part of light source box insulcrete, the light source box insulcrete is packed in respectively on light source box metal cap and the light source box end plate by bolt, electroluminescent element is sealed in the light source box metal cap, the fibre bundle of the light beam that electroluminescent element sends in the steel pipe, the light source box shell is arranged on the light source box end plate, the middle part of light source box lid has the power lead intake, the light source box lid mounts cover the openend at the light source box shell, the light source box dop is arranged in the power lead intake, described photocell box comprises the photocell box end plate, the photocell box lid, the photocell box shell, the photocell box dop, the photocell box metal cap, photoelectric cell and photocell box insulcrete, the photocell box end plate is connected with the end thread of the steel pipe other end, the photocell box metal cap is packed on the photocell box end plate of a relative side with steel pipe, photoelectric cell is packed in the middle part of photocell box insulcrete, the photocell box insulcrete is packed in respectively on photocell box metal cap and the photocell box end plate by bolt, photoelectric cell is sealed in the photocell box metal cap, and the center of the fibre bundle of photronic center in the steel pipe, the photocell box shell is arranged on the photocell box end plate, the middle part of photocell box lid has the output signal outlet, the photocell box lid mounts cover the openend at the photocell box shell, and the photocell box dop is arranged in the output signal outlet.
The present invention compared with prior art has following effect: 1. the light beam that sends of electroluminescent element of the present invention is transferred in the photocell box by fibre bundle, sampling head, the coal powder density of sampling head directly affects the intensity of photoelectric cell receiving optical signals, the variation of coal powder density causes the variation of photoelectric cell output circuit voltage, output voltage concerned over time output on instrument and the computing machine, the coal powder density that just can show online a wind, realized direct measurement concentration of pulverized coal, measuring accuracy and highly sensitive.In the actual production process, by monitoring and regulation and control coal powder density, effectively guaranteed the safety and economic operation of boiler.2. the present invention is simple in structure, manufactures easily, and cost is low.3 the present invention do not require the length of the straight length of a pipeline, and satisfy easily the installation site.4. reliable operation of the present invention, maintenance load is few.5. the present invention is particularly useful for having the concentration of pulverized coal on-line measurement of Pulverized Coal Bin and coal dust free storehouse (direct-firing) combustion system.
Description of drawings
Fig. 1 is that the present invention is with the front view of a sampling head; Fig. 2 is that Fig. 1 is at the cut-open view at A-A place; The enlarged drawing of Fig. 3 seal assembly; Fig. 4 is the enlarged drawing of light source box; Fig. 5 is the enlarged drawing of photocell box; Fig. 6 is that the present invention is with the front view of two sampling heads; Fig. 7 is the circuit diagram (power supply shown in the figure is photoelectric cell) of output voltage signal in the photocell box of the present invention.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1-Fig. 7, present embodiment comprises fibre bundle 2, steel pipe 3, one or two sampling heads 5, light source box 7, photocell box 8 and two seal assemblies 6, fibre bundle 2 vertically is located on wind pipeline 1, and wind pipeline 1 is passed at the two ends of fibre bundle 2 one time, steel pipe 3 is sleeved on the fibre bundle 2, and cementing by heat-resistant adhesive between the inwall of steel pipe 3 and the fibre bundle 2
When the quantity of sampling head 5 is one,
When the quantity of sampling head 5 is two,
Each sampling head 5 all has coal dust vertically by hole 5-1, the both sides of each sampling head 5 radially respectively have a sampling head pickup groove 5-2, steel pipe 3 is packed in respectively on the sampling head pickup groove 5-2 of sampling head 5 both sides, and two sampling heads 5 are positioned at the middle part of fibre bundle 2 side by side
Wind pipeline 1 respectively is provided with a seal assembly 6 with the intersection outside of steel pipe 3, one end of steel pipe 3 is provided with light source box 7, the other end of steel pipe 3 is provided with photocell box 8, described light source box 7 comprises light source box end plate 7-1, light source box lid 7-2, light source box shell 7-3, light source box dop 7-4, light source box metal cap 7-5, electroluminescent element 7-6 and light source box insulcrete 7-7, light source box end plate 7-1 is connected with the end thread of steel pipe 3 one ends, light source box metal cap 7-5 is packed on the light source box end plate 7-1 with steel pipe 3 relative sides, electroluminescent element 7-6 is packed in the middle part of light source box insulcrete 7-7, light source box insulcrete 7-7 is packed in respectively on light source box metal cap 7-5 and the light source box end plate 7-1 by bolt, electroluminescent element 7-6 is sealed in the light source box metal cap 7-5, the fibre bundle 2 of the light beam that electroluminescent element 7-6 sends in the steel pipe 3, light source box shell 7-3 is arranged on the light source box end plate 7-1, the middle part of light source box lid 7-2 has power lead intake 7-2-1, light source box lid 7-2 mounts cover the openend at light source box shell 7-3, light source box dop 7-4 is arranged in the power lead intake 7-2-1, described photocell box 8 comprises photocell box end plate 8-1, photocell box lid 8-2, photocell box shell 8-3, photocell box dop 8-4, photocell box metal cap 8-5, photoelectric cell 8-6 and photocell box insulcrete 8-7, photocell box end plate 8-1 is connected with the end thread of steel pipe 3 other ends, photocell box metal cap 8-5 is packed on the photocell box end plate 8-1 with steel pipe 3 relative sides, photoelectric cell 8-6 is packed in the middle part of photocell box insulcrete 8-7, photocell box insulcrete 8-7 is packed in respectively on photocell box metal cap 8-5 and the photocell box end plate 8-1 by bolt, photoelectric cell 8-6 is sealed in the photocell box metal cap 8-5, and the center of the fibre bundle 2 of the center of photoelectric cell 8-6 in the steel pipe 3, photocell box shell 8-3 is arranged on the photocell box end plate 8-1, the middle part of photocell box lid 8-2 has output signal outlet 8-2-1, photocell box lid 8-2 mounts cover the openend at photocell box shell 8-3, and photocell box dop 8-4 is arranged in the output signal outlet 8-2-1.
The refractory seals glue of present embodiment is 350 ℃ of high-temperature seal adhesives, and manufacturer is that Nanjing infant genius's special glass technology company limited, Jinan one hundred contains glass technology company limited, Guangzhou endurance Environmental Protection Technology Co., Ltd, Beijing space difficult to understand and can prosperous mechanical component repair group company and Guangzhou permanent flourish special glass company limited etc.
The electroluminescent element 7-6 of present embodiment is packed on the light source box insulcrete 7-7, described electroluminescent element 7-6 is light emitting diode, light emitting diode is powered by constant voltage dc source, simultaneously, is fixed with a plurality of connection terminals at the outerplanar of light source box insulcrete 7-7.
The light source box metal cap 7-5 of present embodiment is aluminum light source box metal cap.
The photocell box shell 8-3 of present embodiment is steel photocell box shell.
The photocell box metal cap 8-5 of present embodiment is aluminum photocell box metal cap.
The photocell box insulcrete 8-7 of present embodiment adopts electrician's resin plate to make, and insulation effect is good.
The photoelectric cell 8-6 of present embodiment is packed in the middle part of photocell box insulcrete 8-7, fixed resistance R on the photocell box insulcrete 8-7 outerplanar
0, R
1, R
2With a plurality of connection terminals, photoelectric cell 8-6 receives the light by fibre bundle 2 projections, and the photocurrent of photoelectric cell 8-6 output is by the copper-manganese resistance R
0, copper resistance R
1With adjustable resistance R
2, resistance R
0Both end voltage is as output voltage signal of the present invention.
Centre distance between two sampling heads 5 of present embodiment is 1/3rd of wind pipeline 1 internal diameter.
Embodiment two: in conjunction with Fig. 4-Fig. 5 present embodiment is described, has a plurality of air vent 7-3-1 on the circle wall of the light source box shell 7-3 of present embodiment, have a plurality of air vent 8-3-1 on the circle wall of photocell box shell 8-3.So arrange, ventilation effect is good.Other composition is identical with embodiment one with annexation.
Uniform 2 all air vent 7-3-1 on the circle wall of the light source box shell 7-3 of present embodiment, uniform 2 all air vent 8-3-1 on the circle wall of photocell box shell 8-3.
Embodiment three: in conjunction with Fig. 4 present embodiment is described, the described light source box insulcrete 7-7 of present embodiment is insulation resin sheet.So arrange, light source box insulcrete 7-7 adopts electrician's resin plate to make, and insulation effect is good.Other composition is identical with embodiment one or two with annexation.
Embodiment four: present embodiment is described in conjunction with Fig. 2 and Fig. 3, the described coal powder density on-line measurement device of present embodiment also comprises Antiwear casing 4, Antiwear casing 4 is sleeved on the steel pipe 3, and the intersection of wind pipeline 1 and Antiwear casing 4 respectively is provided with a seal assembly 6.So arrange, effectively protect steel pipe 3 in use not to be worn, prolonged the serviceable life of steel pipe 3.Other composition is identical with embodiment three with annexation.
Embodiment five: in conjunction with Fig. 2 and Fig. 3 present embodiment is described, the Antiwear casing 4 of present embodiment is alloy sleeve or porcelain bushing.So arrange, abrasionproof is effective.Other composition is identical with embodiment four with annexation.
Embodiment six: present embodiment is described in conjunction with Fig. 1 and Fig. 3, each seal assembly 6 of present embodiment includes sealing gasket 6-1, flange 6-2, steel bushing 6-3, nut 6-4, steel loop 6-5 and airtight and watertight padding 6-6, flange 6-2 be packed in wind pipeline 1 and with a wind pipeline 1 of the intersection of fibre bundle 2 on, sealing gasket 6-1 is arranged between wind pipeline 1 and the flange 6-2, steel bushing 6-3 is sleeved on the outer wall of Antiwear casing 4, and the upper inside wall of steel bushing 6-3 is provided with groove, airtight and watertight padding 6-6 is arranged in the groove on steel bushing 6-3 top, and airtight and watertight padding 6-6 is between steel bushing 6-3 and Antiwear casing 4, and steel loop 6-5 fixes steel bushing 6-3 and airtight and watertight padding 6-6 by nut 6-4.So arrange, more firmly fibre bundle and sampling head sealing are fixed on wind pipeline.Other composition is identical with embodiment one or four with annexation.
Embodiment seven: present embodiment is described in conjunction with Fig. 2, the described on-line measurement device of present embodiment also comprises friction-proof piece 9, the size and shape of the size and shape of friction-proof piece 9 and sampling head 5 ends is complementary, and friction-proof piece 9 is packed in the windward side of sampling head 5.So arrange, effectively raise the serviceable life of sampling head.Other composition is identical with embodiment six with annexation.
Embodiment eight: in conjunction with Fig. 2 present embodiment is described, the friction-proof piece 9 of present embodiment is alloy friction-proof piece or ceramic friction-proof piece.So arrange, abrasionproof is effective.Other composition is identical with embodiment seven with annexation.
The course of work of the present invention is:
Electroluminescent element (being light emitting diode) is powered by D.C. regulated power supply, send the light beam of some strength, light beam passes through optical fiber, pass the center pit of sampling head and the fibre bundle of the sampling head other end, be incident upon on the photoelectric cell, when not having a wind to pass through the center pit of sampling head, the photocurrent that photoelectric cell output is larger; When the center pit of distinguished and admirable over-sampling head once, because pulverized coal particle has reduced to be incident upon photronic light intensity by the center pit of sampling head, the photocurrent of photoelectric cell output reduces; Along with concentration of pulverized coal changes, photocurrent changes thereupon, and coal powder density and photocurrent have funtcional relationship, and the photocurrent of photoelectric cell output passes through R
0, R
1, R
2Three resistance, R
0The voltage at resistance two ends accesses instrument and computing machine, can measure and demonstrate the coal powder density of a wind, wherein: R
1Be used for the photoelectric cell ambient temperature compensation, R
2Be used for regulating the photocurrent setting value, when namely coal powder density is zero, R
0The resistance both end voltage is setting value.
Claims (8)
1. boiler concentration of pulverized coal on-line measurement device, it is characterized in that: described on-line measurement device comprises fibre bundle (2), steel pipe (3), one or two sampling heads (5), light source box (7), photocell box (8) and two seal assemblies (6), fibre bundle (2) vertically is located on the wind pipeline (1), and a wind pipeline (1) is passed at the two ends of fibre bundle (2), steel pipe (3) is sleeved on the fibre bundle (2), and cementing by heat-resistant adhesive between the inwall of steel pipe (3) and the fibre bundle (2)
When the quantity of sampling head (5) is one,
Sampling head (5) has coal dust vertically by hole (5-1), the both sides of sampling head (5) radially respectively have a sampling head pickup groove (5-2), steel pipe (3) is packed in the sampling head pickup groove (5-2) of sampling head (5) both sides, and sampling head (5) is positioned at the middle part of fibre bundle (2)
When the quantity of sampling head (5) is two,
Each sampling head (5) all has coal dust vertically by hole (5-1), the both sides of each sampling head (5) radially respectively have a sampling head pickup groove (5-2), steel pipe (3) is packed in respectively on the sampling head pickup groove (5-2) of sampling head (5) both sides, and two sampling heads (5) are positioned at the middle part of fibre bundle (2) side by side
A wind pipeline (1) respectively is provided with a seal assembly (6) with the intersection outside of steel pipe (3), one end of steel pipe (3) is provided with light source box (7), the other end of steel pipe (3) is provided with photocell box (8), described light source box (7) comprises light source box end plate (7-1), light source box lid (7-2), light source box shell (7-3), light source box dop (7-4), light source box metal cap (7-5), electroluminescent element (7-6) and light source box insulcrete (7-7), light source box end plate (7-1) is connected with the end thread of steel pipe (3) one ends, light source box metal cap (7-5) is packed on the light source box end plate (7-1) with the relative side of steel pipe (3), electroluminescent element (7-6) is packed in the middle part of light source box insulcrete (7-7), light source box insulcrete (7-7) is packed in respectively on light source box metal cap (7-5) and the light source box end plate (7-1) by bolt, electroluminescent element (7-6) is sealed in the light source box metal cap (7-5), the light beam that electroluminescent element (7-6) sends is over against the interior fibre bundle (2) of steel pipe (3), light source box shell (7-3) is arranged on the light source box end plate (7-1), the middle part of light source box lid (7-2) has power lead intake (7-2-1), light source box lid (7-2) mounts cover the openend at light source box shell (7-3), light source box dop (7-4) is arranged in the power lead intake (7-2-1), described photocell box (8) comprises photocell box end plate (8-1), photocell box lid (8-2), photocell box shell (8-3), photocell box dop (8-4), photocell box metal cap (8-5), photoelectric cell (8-6) and photocell box insulcrete (8-7), photocell box end plate (8-1) is connected with the end thread of steel pipe (3) other end, photocell box metal cap (8-5) is packed on the photocell box end plate (8-1) with the relative side of steel pipe (3), photoelectric cell (8-6) is packed in the middle part of photocell box insulcrete (8-7), photocell box insulcrete (8-7) is packed in respectively on photocell box metal cap (8-5) and the photocell box end plate (8-1) by bolt, photoelectric cell (8-6) is sealed in the photocell box metal cap (8-5), and the center of photoelectric cell (8-6) is over against the center of the interior fibre bundle (2) of steel pipe (3), photocell box shell (8-3) is arranged on the photocell box end plate (8-1), the middle part of photocell box lid (8-2) has output signal outlet (8-2-1), photocell box lid (8-2) mounts cover the openend at photocell box shell (8-3), and photocell box dop (8-4) is arranged in the output signal outlet (8-2-1).
2. boiler concentration of pulverized coal on-line measurement device according to claim 1, it is characterized in that: have a plurality of air vents (7-3-1) on the circle wall of light source box shell (7-3), have a plurality of air vents (8-3-1) on the circle wall of photocell box shell (8-3).
3. boiler concentration of pulverized coal on-line measurement device according to claim 1 and 2, it is characterized in that: described light source box insulcrete (7-7) is insulation resin sheet.
4. boiler concentration of pulverized coal on-line measurement device according to claim 3, it is characterized in that: described coal powder density on-line measurement device also comprises Antiwear casing (4), Antiwear casing (4) is sleeved on the steel pipe (3), and the intersection of a wind pipeline (1) and Antiwear casing (4) respectively is provided with a seal assembly (6).
5. boiler concentration of pulverized coal on-line measurement device according to claim 4, it is characterized in that: Antiwear casing (4) is alloy sleeve or porcelain bushing.
6. according to claim 1 or 4 described boiler concentration of pulverized coal on-line measurement devices, it is characterized in that: described each seal assembly (6) includes sealing gasket (6-1), flange (6-2), steel bushing (6-3), nut (6-4), steel loop (6-5) and airtight and watertight padding (6-6), flange (6-2) be packed in a wind pipeline (1) and with the wind pipeline (1) of the intersection of fibre bundle (2) on, sealing gasket (6-1) is arranged between a wind pipeline (1) and the flange (6-2), steel bushing (6-3) is sleeved on the outer wall of Antiwear casing (4), and the upper inside wall of steel bushing (6-3) is provided with groove, airtight and watertight padding (6-6) is arranged in the groove of steel bushing (6-3) section, and airtight and watertight padding (6-6) is positioned between steel bushing (6-3) and the Antiwear casing (4), and steel loop (6-5) is fixing with steel bushing (6-3) and airtight and watertight padding (6-6) by nut (6-4).
7. boiler concentration of pulverized coal on-line measurement device according to claim 6, it is characterized in that: described on-line measurement device also comprises friction-proof piece (9), the size and shape of the size and shape of friction-proof piece (9) and sampling head (5) end is complementary, and friction-proof piece (9) is packed in the windward side of sampling head (5).
8. boiler concentration of pulverized coal on-line measurement device according to claim 7, it is characterized in that: friction-proof piece (9) is alloy friction-proof piece or ceramic friction-proof piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210027480 CN102590055B (en) | 2012-02-08 | 2012-02-08 | Online measuring device of primary air pulverized coal density of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210027480 CN102590055B (en) | 2012-02-08 | 2012-02-08 | Online measuring device of primary air pulverized coal density of boiler |
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| Publication Number | Publication Date |
|---|---|
| CN102590055A CN102590055A (en) | 2012-07-18 |
| CN102590055B true CN102590055B (en) | 2013-10-23 |
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|---|---|---|---|
| CN 201210027480 Expired - Fee Related CN102590055B (en) | 2012-02-08 | 2012-02-08 | Online measuring device of primary air pulverized coal density of boiler |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU590223B2 (en) * | 1984-09-26 | 1989-11-02 | Apm Limited | Concentration meter |
| CN2185892Y (en) * | 1994-02-22 | 1994-12-21 | 潘金梅 | Single light source double path photoelectric dust investigating sensor |
| CN201436583U (en) * | 2009-03-27 | 2010-04-07 | 上海理工大学 | Light-scattering type flue dust particle measurement probe |
| EP2405254B1 (en) * | 2010-07-05 | 2014-06-04 | Sick Ag | Optoelectronic method for gas analysis |
| CN202442940U (en) * | 2012-02-08 | 2012-09-19 | 杨英杰 | Device for carrying out online measurement on concentration of primary-air pulverized coals in boilers |
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Granted publication date: 20131023 Termination date: 20200208 |