CN102864257A - Pressure-equalizing and bleeding method for injecting furnace roof tank coal gas by using high-pressure gas - Google Patents
Pressure-equalizing and bleeding method for injecting furnace roof tank coal gas by using high-pressure gas Download PDFInfo
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- CN102864257A CN102864257A CN201210369988XA CN201210369988A CN102864257A CN 102864257 A CN102864257 A CN 102864257A CN 201210369988X A CN201210369988X A CN 201210369988XA CN 201210369988 A CN201210369988 A CN 201210369988A CN 102864257 A CN102864257 A CN 102864257A
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Abstract
The invention discloses a pressure-equalizing and bleeding method for injecting furnace roof tank coal gas by using high-pressure gas, which comprises the following steps: when pressure equalization is performed at the roof of a blast furnace, if primary pressure equalization can not meet the requirements, further opening a secondary pressurization valve, and performing secondary pressure equalization on a weighing tank with nitrogen gas; when bleeding is performed at the roof of the blast furnace, opening a pressure-equalizing and bleeding valve, a bag-type dust remover valve and a natural recovery valve; performing preliminary dust removal on coal gas in the weighing tank with a cyclone dust remover, and then performing fine dust removal with a bag-type dust remover; when the pressure of the coal gas in the weighing tank is lowered to a preset value, closing the natural recovery valve, opening a forced recovery valve and a working gas valve, and introducing high-pressure cleaning gas into an injector; and under the injection effect of the high-pressure cleaning gas, enabling the remaining coal gas in the weighing tank to quickly move into a clean coal gas pipe network, thus realizing the bleeding and recovery of the coal gas in the weighing tank. By introducing the facilities such as the bag-type dust remover, the injector and the like, the invention can prevent the pressure-equalized coal gas from being directly exhausted to the atmosphere, thereby reducing environmental pollution and waste of resources.
Description
Technical field
The present invention relates to the Iron And Steel Industry technical field, relate in particular to a kind of pressure-equalizing and discharging method of utilizing high pressure gas injection furnace roof batch can coal gas.
Background technology
The environmental requirement that steel industry is increasingly serious and Market Situation require iron and steel enterprise must accomplish energy-saving and emission-reduction, reduce cost.At present, blast furnace ironmaking operation discharge amount of pollution occupies the major part of whole steel industry quantity discharged, therefore, reduces the Iron-smelting quantity discharged and seems particularly necessary.
Current, pressure-equalizing and discharging during traditional charging of blast furnace is to utilize half purified gas, nitrogen all to be depressed into the consistent discharge in the blast furnace of realizing with blast furnace top pressure to batch can, when diffusing, raw gas in the batch can directly enters in the atmosphere after the thick dedusting of tornado dust collector, so that the weighing batch can diffuses to normal pressure, satisfy the material feeding of weighing batch can.Although the part dust that reclaims through tornado dust collector can be blown in Plenum Process in the weighing batch can again, still can enter a large amount of dust and enter in the atmosphere every year.What is more important, a large amount of poisonous coal gas has also entered in the air, has not only polluted environment, and is a kind of huge economic waste.By the ton iron amount of diffusing 7～9Nm
3Calculate, at present, China's year coal gas diffusion amount reaches about 50 billion cubic meters, and (the blast furnace gas unit price is by 0.11 yuan/Nm up to 5.5 hundred million yuans for financial loss
3Calculate).
Therefore, if can develop a kind of new pressure-equalizing and discharging technology, stop pressure-equalizing and discharging coal gas and directly sky is diffused, can alleviate environmental pollution, reach the target of setting up the environmental friendliness section steel works, can reclaim a large amount of Gas Resources again, obtain good economic benefit, have wide market outlook.
Summary of the invention
The technical problem to be solved in the present invention is directly sky to be diffused for pressure-equalizing and discharging coal gas in the prior art, give the defective of environment, provide a kind of and can alleviate environmental pollution, can reclaim again the pressure-equalizing and discharging method of utilizing high pressure gas injection furnace roof batch can coal gas of a large amount of Gas Resources.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of pressure-equalizing and discharging method of utilizing high pressure gas injection furnace roof batch can coal gas is provided, the method is based on a pressure-equalizing bleeding device, this device comprises the pressure-equalizing and discharging pipeline, pressure equalizing blow off valve, an equalizing valve, the secondary equalizing valve, the whirlwind unloading valve, tornado dust collector, sack cleaner, gravitational precipitator and purified gas pipe network, it is characterized in that, this device also comprises injector, this injector comprises an ejection gas entrance, working gas entrance and an outlet, wherein, the ejection gas entrance is connected with sack cleaner by pipeline, and is provided with the pressure recovery valve at this pipeline; The working gas entrance of injector is connected with high pressure cleaning gas by pipeline, and is provided with the working gas valve at this pipeline; The outlet of injector is connected with the purified gas pipe network by pipeline, and is provided with vacuum breaker at this pipeline; Injector also is provided with by-pass line, and this by-pass line one end is communicated with sack cleaner, and the other end is communicated with vacuum breaker, and also is provided with the nature recovery valve on this pipeline;
Realize utilizing the pressure-equalizing and discharging method of high pressure gas injection furnace roof batch can coal gas based on this device, may further comprise the steps:
When blast furnace roof is all pressed, open equalizing valve and pressure equalizing blow off valve, enter in the weighing batch can through the pressure-equalizing and discharging pipeline through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector is entered in the weighing batch can;
Can not meet the demands if once all press, open again the secondary equalizer valve, with nitrogen the weighing batch can be carried out secondary and all press, after batch can pressure satisfies equal pressure request, all press completely, close each related valve, open the blanking lock, furnace charge enters the blast furnace through the blanking lock from the weighing batch can;
When blast furnace roof diffuses, open pressure equalizing blow off valve, sack cleaner valve and natural recovery valve, the coal gas in the weighing batch can enters sack cleaner and carries out smart dedusting behind the tornado dust collector rough dusting;
When gas pressure is low to moderate preset value in the weighing batch can, close the nature recovery valve, open and force recovery valve and working gas valve, high pressure cleaning gas enters in the injector, remaining coal gas is under the injection of high pressure cleaning gas in the weighing batch can, enter fast in the purified gas pipe network, to realize coal gas diffusion and recovery in the weighing batch can.
In the method for the present invention, between tornado dust collector and sack cleaner, be connected with surge tank.
In the method for the present invention, described high pressure cleaning gas is high pressure nitrogen or high-pressure water vapor.
In the method for the present invention, described preset value is between 50～100KPa.
The beneficial effect that the present invention produces is: by introducing the facilities such as sack cleaner and injector, all press coal-gas recovering to enter the purified gas pipe network batch can, avoid all pressing coal gas directly to enter environmental pollution and the wasting of resources that atmosphere causes, had good economic benefit and social benefit.In addition, fixed investment of the present invention and operation expense are cheap, and schedule of operation and original technique are basically identical, easy to learn, safe and reliable.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation that the embodiment of the invention is utilized the pressure-equalizing bleeding device of high pressure gas injection furnace roof batch can coal gas.
Among the figure, 1-blast-furnace body; 2-blanking lock; 3-weighing batch can; 4-pressure-equalizing and discharging pipeline; 5-pressure equalizing blow off valve; 6-whirlwind unloading valve; 7-tornado dust collector; 8-equalizing valve; 9-secondary equalizing valve; The 10-surge tank; 11-sack cleaner valve; 12-sack cleaner soot cleaning valve; The 13-sack cleaner; 14-forces recovery valve; 15-nature recovery valve; 16-working gas valve; The 17-injector; The 18-vacuum breaker; 19-purified gas pipe network.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the embodiment of the invention is utilized the pressure-equalizing bleeding device of high pressure gas injection furnace roof batch can coal gas, comprise pressure-equalizing and discharging pipeline 4, pressure equalizing blow off valve 5, equalizing valve 8, secondary equalizing valve 9, whirlwind unloading valve 6, tornado dust collector 7, sack cleaner 13, gravitational precipitator (not shown) and a purified gas pipe network 19, it is characterized in that
This device also comprises injector 17, and this injector 17 comprises an ejection gas entrance, working gas entrance and an outlet, and wherein, the ejection gas entrance is connected with sack cleaner 13 by pipeline, and is provided with pressure recovery valve 14 at this pipeline;
The working gas entrance of injector 17 is connected with high pressure cleaning gas by pipeline, and is provided with working gas valve 16 at this pipeline;
The outlet of injector 17 is connected with purified gas pipe network 19 by pipeline, and is provided with vacuum breaker 18 at this pipeline;
Injector also is provided with by-pass line, and this by-pass line one end is communicated with sack cleaner 13, and the other end is communicated with vacuum breaker 18, and also is provided with nature recovery valve 15 on this pipeline.
In one embodiment of the invention, when coal gas is introduced purified gas pipe network 19, in order to reduce gas to the impact of sack cleaner 13, between tornado dust collector 7 and sack cleaner 13, be connected with surge tank 10.
The embodiment of the invention is utilized the pressure-equalizing and discharging method of high pressure gas injection furnace roof batch can coal gas, and it specifically may further comprise the steps based on the pressure-equalizing bleeding device that utilizes high pressure gas injection furnace roof batch can coal gas of above-described embodiment:
When blast furnace roof is all pressed, open equalizing valve 8 and pressure equalizing blow off valve 5, enter in the weighing batch can 3 through pressure-equalizing and discharging pipeline 4 through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector 7 is entered in the weighing batch can 3;
Can not meet the demands if once all press, open again secondary equalizer valve 9, with nitrogen weighing batch can 3 be carried out secondary and all press, after batch can pressure satisfies equal pressure request, all press completely, close each related valve, open blanking lock 2, furnace charge enters the blast-furnace body 1 through blanking lock 2 from weighing batch can 3;
When blast furnace roof diffuses, open pressure equalizing blow off valve 5, sack cleaner valve 11 and natural recovery valve 15, the coal gas in the weighing batch can 3 enters sack cleaner 13 and carries out smart dedusting behind tornado dust collector 7 rough dusting;
When weighing batch can 3 interior gas pressures are low to moderate preset value, close the nature recovery valve, open and force recovery valve 14 and working gas valve 16, high pressure cleaning gas enters in the injector 17, weighing batch can 3 interior remaining coal gas are under the injection of high pressure cleaning gas, enter fast in the purified gas pipe network 19, to realize 3 interior coal gas diffusion and the recovery of weighing batch can.
In one embodiment of the present of invention, high pressure cleaning gas can be nitrogen or water vapor.
In one embodiment of the present of invention, during coal gas diffusion in the weighing batch can 3, preset value is 50～100KPa.
Below utilize the preferred embodiment of the pressure-equalizing and discharging method of high pressure gas injection furnace roof batch can coal gas for the present invention:
When blast furnace roof is all pressed, adopt tradition all to press mode, namely open equalizing valve 8 and pressure equalizing blow off valve 5, enter in the weighing batch can 3 through pressure-equalizing and discharging pipeline 4 through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector 7 is entered weighing batch can 3.Can not meet the demands if once all press, open again secondary equalizer valve 9, with nitrogen weighing batch can 3 be carried out secondary and all press, reach suitable pressure requirement; All press completely, close relevant each valve, open blanking lock 2, furnace charge enters the blast furnace through blanking lock 2 from weighing batch can 3.
When blast furnace roof diffuses, open pressure equalizing blow off valve 5, sack cleaner valve 11 and natural recovery valve 15, the coal gas in the weighing batch can 3 enters sack cleaner 13 and carries out smart dedusting behind tornado dust collector 7 rough dusting.Because when just having begun to diffuse, the relative purified gas pipe network of weighing batch can 3 interior gas pressures is higher, the coal gas in the weighing batch can directly enter in the purified gas pipe network 19 by natural recovery valve 15; When the pressure decreased in the weighing batch can 3 during to 100KPa, the speed that coal gas in the weighing batch can 3 enters purified gas pipe network 19 significantly reduces, at this moment, close nature recovery valve 15, open and force recovery valve 14 and working gas valve 16, high pressure nitrogen enters in the injector 17, and weighing batch can 3 interior remaining coal gas are under the injection of high pressure nitrogen, enter fast in the purified gas pipe network 19, realize the purpose that coal gas diffusion also reclaims in the weighing batch can.
Embodiment 2
When all pressing, adopt tradition all to press mode, namely open equalizing valve 8 and pressure equalizing blow off valve 5, enter in the weighing batch can 3 through pressure-equalizing and discharging pipeline 4 through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector 7 is entered weighing batch can 3.Can not meet the demands if once all press, open again secondary equalizer valve 9, with nitrogen weighing batch can 3 be carried out secondary and all press, reach suitable pressure requirement; All press completely, close relevant each valve, open blanking lock 2, furnace charge enters the blast furnace through blanking lock 2 from weighing batch can 3.
When diffusing, open pressure equalizing blow off valve 5, the coal gas in sack cleaner valve 11 and the natural recovery valve 15, weighing batch can enters sack cleaner 13 and carries out smart dedusting behind tornado dust collector 7 rough dusting.Because when just having begun to diffuse, the relative purified gas pipe network of gas pressure is higher in the weighing batch can, the coal gas in the weighing batch can directly enter in the purified gas pipe network 19 by natural recovery valve 15; When the pressure decreased in the weighing batch can 3 during to 50KPa, the speed that coal gas in the weighing batch can 3 enters purified gas pipe network 19 significantly reduces, at this moment, close nature recovery valve 15, open and force recovery valve 14 and working gas valve 16, high pressure nitrogen enters in the injector 17, and weighing batch can 3 interior remaining coal gas are under the injection of high pressure nitrogen, enter fast in the purified gas pipe network 19, realize the purpose that coal gas diffusion also reclaims in the weighing batch can.
When all pressing, adopt tradition all to press mode, namely open equalizing valve 8 and pressure equalizing blow off valve 5, enter in the weighing batch can 3 through pressure-equalizing and discharging pipeline 4 through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector 7 is entered weighing batch can 3.Can not meet the demands if once all press, open again secondary equalizer valve 9, with nitrogen weighing batch can 3 be carried out secondary and all press, reach suitable pressure requirement; All press completely, close relevant each valve, open blanking lock 2, furnace charge enters the blast furnace through blanking lock 2 from weighing batch can 3.
When diffusing, open pressure equalizing blow off valve 5, sack cleaner valve 11 and natural recovery valve 15, the coal gas in the weighing batch can 3 enters sack cleaner 13 and carries out smart dedusting behind tornado dust collector 7 rough dusting.Because when just having begun to diffuse, the relative purified gas pipe network of weighing batch can 3 interior gas pressures is higher, the coal gas in the weighing batch can 3 can directly enter in the purified gas pipe network 19 by natural recovery valve 15; When the pressure decreased in the weighing batch can 3 during to 100KPa, the speed that coal gas in the weighing batch can 3 enters purified gas pipe network 19 significantly reduces, at this moment, close nature recovery valve 15, open and force recovery valve 14 and working gas valve 16, high-pressure water vapor enters in the injector 17, and batch can 3 interior remaining coal gas are under the injection of high-pressure water vapor, enter fast in the purified gas pipe network 19, realize the purpose that coal gas diffusion also reclaims in the batch can.
When all pressing, adopt tradition all to press mode, namely open equalizing valve 8 and pressure equalizing blow off valve 5, enter in the weighing batch can 3 through pressure-equalizing and discharging pipeline 4 through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector 7 is entered weighing batch can 3.Can not meet the demands if once all press, open again secondary equalizer valve 9, with nitrogen weighing batch can 3 be carried out secondary and all press, reach suitable pressure requirement; All press completely, close relevant each valve, open blanking lock 2, furnace charge enters the blast furnace through blanking lock 2 from weighing batch can 3.
When diffusing, open pressure equalizing blow off valve 5, sack cleaner valve 11 and natural recovery valve 15, the coal gas in the weighing batch can 3 enters sack cleaner 13 and carries out smart dedusting behind tornado dust collector 7 rough dusting.Because when just having begun to diffuse, the relative purified gas pipe network of weighing batch can 3 interior gas pressures is higher, the coal gas in the weighing batch can 3 can directly enter in the purified gas pipe network 19 by natural recovery valve 15; When the pressure decreased in the weighing batch can 3 during to 50KPa, the speed that coal gas in the weighing batch can 3 enters purified gas pipe network 19 significantly reduces, at this moment, close nature recovery valve 15, open and force recovery valve 14 and working gas valve 16, high-pressure water vapor enters in the injector 17, and weighing batch can 3 interior remaining coal gas are under the injection of high-pressure water vapor, enter fast in the purified gas pipe network 19, realize weighing batch can 3 interior coal gas diffusions and the purpose that reclaims.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (4)
1. pressure-equalizing and discharging method of utilizing high pressure gas injection furnace roof batch can coal gas, it is characterized in that, the method is based on a pressure-equalizing bleeding device, this device comprises the pressure-equalizing and discharging pipeline, pressure equalizing blow off valve, an equalizing valve, the secondary equalizing valve, the whirlwind unloading valve, tornado dust collector, sack cleaner, gravitational precipitator and purified gas pipe network, this device also comprises injector, this injector comprises an ejection gas entrance, working gas entrance and an outlet, wherein, the ejection gas entrance is connected with sack cleaner by pipeline, and is provided with the pressure recovery valve at this pipeline; The working gas entrance of injector is connected with high pressure cleaning gas by pipeline, and is provided with the working gas valve at this pipeline; The outlet of injector is connected with the purified gas pipe network by pipeline, and is provided with vacuum breaker at this pipeline; Injector also is provided with by-pass line, and this by-pass line one end is communicated with sack cleaner, and the other end is communicated with vacuum breaker, and also is provided with the nature recovery valve on this pipeline;
Realize utilizing the pressure-equalizing and discharging method of high pressure gas injection furnace roof batch can coal gas based on this device, may further comprise the steps:
When blast furnace roof is all pressed, open equalizing valve and pressure equalizing blow off valve, enter in the weighing batch can through the pressure-equalizing and discharging pipeline through half purified gas of gravitational precipitator dedusting, and the dust blowback in the tornado dust collector is entered in the weighing batch can;
Can not meet the demands if once all press, open again the secondary equalizer valve, with nitrogen the weighing batch can be carried out secondary and all press, after batch can pressure satisfies equal pressure request, all press completely, close each related valve, open the blanking lock, furnace charge enters the blast furnace through the blanking lock from the weighing batch can;
When blast furnace roof diffuses, open pressure equalizing blow off valve, sack cleaner valve and natural recovery valve, the coal gas in the weighing batch can enters sack cleaner and carries out smart dedusting behind the tornado dust collector rough dusting;
When gas pressure is low to moderate preset value in the weighing batch can, close the nature recovery valve, open and force recovery valve and working gas valve, high pressure cleaning gas enters in the injector, remaining coal gas is under the injection of high pressure cleaning gas in the weighing batch can, enter fast in the purified gas pipe network, to realize coal gas diffusion and recovery in the weighing batch can.
2. method according to claim 1 is characterized in that, is connected with surge tank between tornado dust collector and sack cleaner.
3. method according to claim 2 is characterized in that, described high pressure cleaning gas is high pressure nitrogen or high-pressure water vapor.
4. method according to claim 3 is characterized in that, described preset value is between 50～100KPa.
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| CN103277672A (en) * | 2013-04-17 | 2013-09-04 | 新兴能源装备股份有限公司 | Pressure relieving device for safety valve of bottle group for station |
| CN104073581A (en) * | 2014-06-18 | 2014-10-01 | 鞍钢集团工程技术有限公司 | Process method and device for forcibly recovering diffused gas of blast furnace |
| CN104263866A (en) * | 2014-09-28 | 2015-01-07 | 中冶华天南京工程技术有限公司 | System and process for purifying and utilizing equalized diffuse gas of blast furnace top charging bucket |
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| CN107164589A (en) * | 2017-07-10 | 2017-09-15 | 中冶华天工程技术有限公司 | A kind of blast furnace top pressure-equalizing bleeding coal gas air port blowback technique and system |
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| CN108570523A (en) * | 2017-03-07 | 2018-09-25 | 北京凯德恒源科技发展有限公司 | Blast furnace roof based on gas fan presses the full recovery method of coal gas |
| CN109234481A (en) * | 2018-08-31 | 2019-01-18 | 首钢集团有限公司 | A kind of full recovery method of furnace top material tank for blast furnace emission coal gas and system |
| CN109234482A (en) * | 2018-08-31 | 2019-01-18 | 首钢集团有限公司 | A kind of full recovery system of furnace top material tank for blast furnace emission coal gas and its safety inspection method |
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| CN103277672B (en) * | 2013-04-17 | 2015-10-14 | 新兴能源装备股份有限公司 | Stand with bottle group safety valve pressure relief device |
| CN103277672A (en) * | 2013-04-17 | 2013-09-04 | 新兴能源装备股份有限公司 | Pressure relieving device for safety valve of bottle group for station |
| CN104073581A (en) * | 2014-06-18 | 2014-10-01 | 鞍钢集团工程技术有限公司 | Process method and device for forcibly recovering diffused gas of blast furnace |
| CN104263866A (en) * | 2014-09-28 | 2015-01-07 | 中冶华天南京工程技术有限公司 | System and process for purifying and utilizing equalized diffuse gas of blast furnace top charging bucket |
| CN108570523A (en) * | 2017-03-07 | 2018-09-25 | 北京凯德恒源科技发展有限公司 | Blast furnace roof based on gas fan presses the full recovery method of coal gas |
| CN107066767A (en) * | 2017-05-26 | 2017-08-18 | 中国石油大学(北京) | A kind of collection transmission pipe network computational methods and device comprising wave ejector |
| CN107066767B (en) * | 2017-05-26 | 2020-07-28 | 中国石油大学(北京) | Gathering and transportation pipe network computing method and device comprising gas wave ejector |
| CN107164589A (en) * | 2017-07-10 | 2017-09-15 | 中冶华天工程技术有限公司 | A kind of blast furnace top pressure-equalizing bleeding coal gas air port blowback technique and system |
| CN107201417A (en) * | 2017-07-18 | 2017-09-26 | 沈阳红杉科技有限公司 | A kind of full retracting device of blast furnace roof feed pot pressure-equalizing and discharging coal gas and recovery method |
| CN107699648A (en) * | 2017-11-29 | 2018-02-16 | 中冶南方工程技术有限公司 | A kind of full recovery system of blast furnace top pressure-equalizing bleeding coal gas and method |
| CN109234481A (en) * | 2018-08-31 | 2019-01-18 | 首钢集团有限公司 | A kind of full recovery method of furnace top material tank for blast furnace emission coal gas and system |
| CN109234482A (en) * | 2018-08-31 | 2019-01-18 | 首钢集团有限公司 | A kind of full recovery system of furnace top material tank for blast furnace emission coal gas and its safety inspection method |
| CN109234482B (en) * | 2018-08-31 | 2020-08-25 | 首钢集团有限公司 | Full recovery system for coal gas diffused by blast furnace top charging bucket and safety maintenance method thereof |
| CN110004258A (en) * | 2019-04-02 | 2019-07-12 | 北京首钢国际工程技术有限公司 | A kind of device recycling blast furnace top pressure-equalizing bleeding coal gas |
| CN110004258B (en) * | 2019-04-02 | 2024-02-09 | 北京首钢国际工程技术有限公司 | Device for recycling blast furnace top pressure equalizing and diffusing gas |
| CN111363870A (en) * | 2020-02-21 | 2020-07-03 | 江阴兴澄特种钢铁有限公司 | Environment-friendly damping-down method for blast furnace |
| CN115058552A (en) * | 2022-05-27 | 2022-09-16 | 中冶南方工程技术有限公司 | Method for recovering pressure-equalizing coal gas of blast furnace charging bucket |
| CN115058552B (en) * | 2022-05-27 | 2023-11-21 | 中冶南方工程技术有限公司 | Method for recycling pressure equalizing gas of blast furnace tank |
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Application publication date: 20130109 |