CN103225006A - Continuous analysis system of blast-furnace integrated gas - Google Patents
Continuous analysis system of blast-furnace integrated gas Download PDFInfo
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Abstract
The invention discloses a continuous analysis system of blast-furnace integrated gas, belonging to the technical field of continuous analysis of blast furnace gas. According to the invention, a top of a gas pretreatment apparatus is connected with an inlet of a secondary purifying apparatus, an outlet of the secondary purifying apparatus is connected to a gas chromatograph, and a data processing unit is connected with the gas chromatograph. The gas pretreatment apparatus comprises a cylinder, a cylinder cap, a sample gas inlet, a sample gas outlet, a heat-insulation layer and a dehydrating and dedusting assembly, wherein a bottom of the cylinder cap is provided with the sample gas inlet, a top of the cylinder is provided with the sample gas outlet, inside of the cylinder is provided with the heat-insulation layer, inside of the heat-insulation layer is provided with the dehydrating and dedusting assembly, and the dehydrating and dedusting assembly comprises a fixed sleeve, a first clamp arm, a second heat conduction clamp arm, a sample gas pipeline, a filter core replacing port, a refrigerating sheet, a cooling water pipe, a heat transfer sheet and an electric control unit. The sample gas treated by the gas pretreatment apparatus can reach requirements of normal working of the gas chromatograph. The system plays an important role on long-term and stabile operation of the blast furnace, and improvement of utilization efficiency of the gas.
Description
Technical field
The present invention relates to blast furnace coal gas successive analysis technical field, more particularly, relate to a kind of blast furnace coal gas successive analysis system.
Background technology
Detecting the stock gas composition in the blast furnace operating is a very important job.CO, CO in the accurate continuous automatic inspection top gas
2, H
2Content, to judging conditions of blast furnace and equipment work situation, it is extremely important to finish the blast furnace efficient operation.The difficult point of the comprehensive coal gas successive analysis of furnace roof system is the sampling purifying treatment of sample gas.Tradition blast furnace gas analysis system sampling device is installed in the gravitational precipitator back, and the sample gas disposal generally need be through two stages: filter and dehydration.Promptly Qu Yang coal gas enters dust removal filter under the effect of off-gas pump, through multistage dedusting, removes most of dust, passes through air water separator (or moisture eliminator) again and removes most of moisture, enters analytical instrument through fine filter at last.In addition, because amount of dust is big after the dedusting, need to increase regularly N
2Back-blowing device guarantee pipeline unimpeded (thank to Yongping. blast furnace gas analysis integrated system. analytical instrument, 1998, No.3:28 ~ 30; With stock gas composition analysis control blast furnace operating. metallurgical collected translation .1995, No.1:6 ~ 7), in the blast furnace coal gas successive analysis system that uses always in the prior art, its sample gas pretreating system all needs regularly N
2Blowback, unimpeded with the pipeline that guarantees the sample gas pretreating system, make the work of continous-stable for a long time of sample gas pretreating system like this, this is a great difficult problem that always perplexs iron and steel enterprise's continuous detecting top gas.At present, domestic and international good few of top gas continuous on-line analysis system running effect, its major cause is that the sample gas pretreating system is too complicated, maintenance is big, investment cost height (abroad, pretreatment system is close with gas analysis instrument price), and install, debug, safeguard all complicated, also higher to the requirement of maintenance personnel's state of the art, make troubles to use.
Exploitation about top gas successive analysis system, existing relevant technical literature is open, as: Wang Ping, Li Jiaxin, the comprehensive coal gas successive analysis of the blast furnace furnace roof system of people such as Zhou Liying research and development can provide online blast furnace gas composition analysis continuously for the blast furnace watchroom, obtained effect (Wang Ping preferably, Li Jiaxin, Zhou Liying etc. the exploitation and the application of the comprehensive coal gas successive analysis of blast furnace furnace roof system. iron and steel, 2004, No.6:6 ~ 9), the difficult point that this paper middle finger goes out the system development of stock gas successive analysis is the purifying treatment of sample gas, makes a concrete analysis of as follows:
(1) wet method stock gas dust-removal system sample gas purifying treatment difficult point: (useful volume is 2545 m to No. 1 blast furnace of Ma Gangxin
3) coal gas clean to adopt is wet type series connection venturi system.Gravitational precipitator outlet dust content of gas is 2.32 ~ 3.28 g/m
3, the coal gas water content is 5%, 100 ~ 300 ℃ of temperature; Secondary venturi outlet dustiness is 2 ~ 4 mg/m
3, outlet coal gas water content is 6 ~ 10 g/m
3(wherein containing mechanical water), temperature be 30 ~ 60 ℃ (Gong Yishu, Ding Baozhong, Ling Shaoye etc. horse steel 2500 m
3The test of blast furnace gas cleaning system and research. ironmaking, 1996,15 (2): 26 ~ 28).Because each position its dust-laden of sample gas, temperature and water content are different, so it is handled also impossible the same with purifying method.In gravitational precipitator outlet sampling, the easy dewfall of sampling line is stopped up, so will be incubated sample gas, will carry out blowback to sampling line and sweep, and sample gas load of dust remove is heavy.In the sampling of secondary venturi outlet, main task is to remove the moisture of sample gas, secondly is the dust-laden that removes sample gas.
(2) maintenance workload: many sampling units and analytical instrument can use finely in the laboratory and analysis precision higher, but have more than is neededly at the scene how long just can not run well, analytical error is bigger.Studying carefully its major cause is that the system maintenance work amount is big, and maintenance personnel's expertise is required height and system core device (as electronic, operated pneumatic valve, filter core) life-span weak point etc.
(3) to the adaptability of the unusual working of a furnace: throat temperature height when the working of a furnace is undesired, furnace roof is fetched water many, and the coal gas water content increases.So sample gas collection and refining plant want to deal with abnormal conditions such as gas pressure, temperature and water content fluctuation are big.
But, the framework of only having introduced the gas composition analytical system in the technical literature of the disclosure constitutes, for this key structure design of sample gas pretreatment unit, the disclosure document is only briefly write clear principle of work, and unexposed concrete structure design, the staff of field of metallurgy can't reproduce this gas composition analytical system according to the introduction of the document, and the contriver of this patent is on the basis of this research paper, through test of long duration and analysis, redesign out technical scheme of the present invention after the improvement.
In addition, by patent retrieval, open about the existing related art scheme of the preconditioning technique of sample gas analytical test.As, Chinese patent application numbers 201110217370.7, the applying date: on July 21st, 2011, invention and created name is: a kind of smoke filtration, dehumidifying, blended device of being used for, this application case comprises flue gas inlet tube, flue gas fairlead, hybrid chamber, it is cylindric that single unit system is, device is divided into top and is divided into the dehumidifying chamber, the bottom is divided into hybrid chamber, the dividing plate that catchments is set between the two, adorn respectively in the described hybrid chamber flue gas inlet tube and flue gas fairlead pass the dehumidifying chamber lead to the outside, the bottom of described flue gas fairlead is connected with filtering chamber, the bottom of hybrid chamber has ash-removing mouth.In addition: China Patent No. ZL201010548826.3, denomination of invention is: the flue gas sampling dewatering unit.Above-mentioned technical scheme has been carried out pre-treatment to flue gas to a certain extent, but its structure design is unreasonable, generally all needs to adopt N
2Back-blowing device is unimpeded with the assurance pipeline, and maintenance cost is big, is inconvenient to use.
Summary of the invention
The technical problem that invention will solve
It is comparatively complicated to the objective of the invention is to overcome in the prior art top gas continuous on-line analysis system, and its coal gas pretreatment unit need increase regularly N
2Back-blowing device guarantees that pipeline is unimpeded, and expensive deficiency, a kind of blast furnace coal gas successive analysis system is provided, adopt technical scheme of the present invention, the performance of pretreatment unit is good, price is low, the life-span is long, maintenance is simple, meet gas chromatograph to the requirement of sample makings amount, and the coal gas pretreatment unit need not to carry out timing N
2The blowback operation.
Technical scheme
For achieving the above object, technical scheme provided by the invention is:
A kind of blast furnace coal gas successive analysis of the present invention system, comprise the coal gas pretreatment unit, the secondary-cleaned device, gas chromatograph and data processing unit, described coal gas pretreatment unit bottom is connected with sample gas stopple coupon, the depth of penetration of this sample gas stopple coupon is 1/2 ~ 1/3 of a gas line caliber, the cut of sample gas stopple coupon is opposite with the coal gas flow path direction, described coal gas pretreatment unit top links to each other with the inlet of secondary-cleaned device, the outlet of this secondary-cleaned device is connected to gas chromatograph, described data processing unit is connected with gas chromatograph, wherein:
Described coal gas pretreatment unit, comprise cylinder, cap, the import of sample gas, the outlet of sample gas, thermal insulation layer and dehydration dedusting assembly, described cylinder is hollow structure and vertically is provided with, the bottom of this cylinder is fixed with the cap of conical structure, described cap bottom is provided with the import of sample gas, and described cylinder top is provided with the outlet of sample gas; Be provided with thermal insulation layer in the described cylinder, this thermal insulation layer inside is provided with dehydration dedusting assembly, described dehydration dedusting assembly comprises fixed muffle, first jig arm, the second heat conduction jig arm, the sample feed channel, the filter core replacement port, refrigerating sheet, water-cooled tube, heat transfer sheet and ECU, wherein: described column body vertically is provided with the sample feed channel, fixed muffle is passed in described sample feed channel bottom, this sample feed channel lower end is connected with the import of sample gas, sample feed channel upper end is provided with the filter core replacement port, this upper end is connected with the outlet of sample gas, and is provided with filter core in this sample feed channel; One side of described sample feed channel is equipped with first jig arm, opposite side is equipped with the second heat conduction jig arm, the first above-mentioned jig arm and the second heat conduction jig arm are wrapped in the periphery edge of sample feed channel jointly, the described second heat conduction jig arm contacts with the cold junction of refrigerating sheet, the hot junction of described refrigerating sheet contacts with a side of heat transfer sheet, the opposite side of heat transfer sheet is provided with water-cooled tube, and above-mentioned refrigerating sheet links to each other with ECU, and this ECU is used to control refrigerating sheet work.
Further, described secondary-cleaned device is the weldless steel tube that two ends are provided with end cap, and the steel wire cleaning ball is equipped with in this weldless steel tube inside.
Further, the filter core in the described sample feed channel is the steel wire cleaning ball.
Further, the material of described second heat conduction jig arm and heat transfer sheet is a copper material.
Further, the material of the described fixed muffle and first jig arm is a nylon material.
Beneficial effect
Adopt technical scheme provided by the invention, compare, have following unusual effect with existing known technology:
(1) a kind of blast furnace coal gas successive analysis of the present invention system, the filter element filtering mode is adopted in its dedusting, and filter core is positioned at the sample feed channel, the coal gas sample feed channel of flowing through, dust be by filter element filtering, the refrigeration of refrigerating sheet energising simultaneously, the temperature of water in the coal gas is reduced, thereby the condensation dehydration has realized sample gas filtration and dewatering integrated, makes dust content by 4mg/m
3Drop to 0.5mg/m
3, moisture content is by 8g/m
3Drop to 0.5g/m
3One of innovative point of key of the present invention is: when pending coal gas passes through the sample feed channel, dust is attached on the filter core, the water of the condensation of refrigeration dehydration simultaneously also is attached on the filter core, feasible filtration get off dust along with refrigerating water together flows to the bottom of sample feed channel, finally turn back in the gas line, this process by chance also is the cleaning process to filter core, so filtration and dewatering integrated coal gas pretreatment unit have the self-stip function among the present invention, need not to carry out timing N
2Blowback operation can realize that serial sampling purifies, and simple in structure, easy for installation, can non-stop run as long as just do not cut off the water supply, do not cut off the power supply, and need not manual intervention and maintenance;
(2) a kind of blast furnace coal gas successive analysis of the present invention system, filter core in its sample feed channel is the steel wire cleaning ball, this steel wire cleaning ball cost is low, only need replacing in about eight months once, it is (external to cost an arm and a leg with other, coal gas pretreatment unit general several ten thousand is to hundreds thousand of units), bulky, baroque stock gas successive analysis pretreatment unit compares, coal gas pretreatment unit cost of the present invention only needs 3000 ~ 5000 yuan, and performance is good, it is all very convenient to install and use, safeguard, system's one-time investment is low;
(3) a kind of blast furnace coal gas successive analysis of the present invention system, it adopts sampling and purifies incorporate sample gas pretreatment unit, can serial sampling purify, handle the requirement that back sample gas reaches the gas chromatograph works better, coal gas successive analysis of the present invention system to blast furnace direct motion steady in a long-term, improve the coal gas utilising efficiency, reduce coke ratio and have vital role, having remarkable economic efficiency, is the indispensable monitoring tool of blast furnace section chief.
Description of drawings
Fig. 1 is the structural representation of coal gas pretreatment unit among the present invention;
Fig. 2 is the sectional view of coal gas pretreatment unit among Fig. 1;
Fig. 3 is the formation synoptic diagram of a kind of blast furnace coal gas successive analysis of the present invention system.
Label declaration in the synoptic diagram:
1, sample gas import; 2, fixed muffle; 3, first jig arm; 4, thermal insulation layer; 5, sample feed channel; 6, sample gas outlet; 7, filter core replacement port; 8, the second heat conduction jig arm; 9, refrigerating sheet; 10, water-cooled tube; 11, cylinder; 12, heat transfer sheet, 13, cap; 14, gas line; 15, ECU; 16, secondary-cleaned device; 17, gas chromatograph; 18, data processing unit.
Embodiment
For further understanding content of the present invention, in conjunction with the accompanying drawings and embodiments the present invention is described in detail.
Embodiment 1
In conjunction with Fig. 3, a kind of blast furnace coal gas of present embodiment successive analysis system, comprise coal gas pretreatment unit (among the figure not label), secondary-cleaned device 16, gas chromatograph 17 and data processing unit 18, described coal gas pretreatment unit bottom is connected with sample gas stopple coupon, for obtaining representational coal gas sample, the depth of penetration of this sample gas stopple coupon is that 1/2 ~ 1/3 of gas line 14 calibers all can, the weldless steel tube that sample gas stopple coupon in the present embodiment is 50mm by five diameters is formed side by side, the cut of sample gas stopple coupon opposite with the coal gas flow path direction (as shown in Figure 3), described coal gas pretreatment unit top links to each other with the inlet of secondary-cleaned device 16, the outlet of this secondary-cleaned device 16 is connected to gas chromatograph 17, and described data processing unit 18 is connected with gas chromatograph 17.Secondary-cleaned device 16 in the present embodiment is provided with the weldless steel tube of end cap for two ends, the steel wire cleaning ball is equipped with in this weldless steel tube inside, the secondary-cleaned device 16 that the steel wire cleaning ball is prepared from as filter core has good secondary-cleaned effect, can further be the dedusting of sample gas.
As depicted in figs. 1 and 2, coal gas pretreatment unit in the present embodiment, comprise cylinder 11, cap 13, sample gas import 1, sample gas outlet 6, thermal insulation layer 4 and dehydration dedusting assembly, described cylinder 11 is hollow structure and vertically is provided with, the bottom of this cylinder 11 is fixed with the cap 13 of conical structure, described cap 13 bottoms are provided with sample gas import 1, this sample gas import 1 is used to connect sample gas stopple coupon, described cylinder 11 tops are provided with sample gas outlet 6, enter the 16 further dedustings of secondary-cleaned device from these sample gas outlet 6 sample gas that come out.
In the present embodiment, be provided with thermal insulation layer 4 in the cylinder 11 of hollow structure, these thermal insulation layer 4 inside are provided with dehydration dedusting assembly, this dehydration dedusting assembly comprises fixed muffle 2, first jig arm 3, the second heat conduction jig arm 8, sample feed channel 5, filter core replacement port 7, refrigerating sheet 9, water-cooled tube 10, heat transfer sheet 12 and ECU 15, wherein: cylinder 11 inside vertically are provided with sample feed channel 5, fixed muffle 2 is passed in described sample feed channel 5 bottoms, the material of fixed muffle 2 is a nylon material, 2 pairs of sample feed channel 5 of this fixed muffle play fixed supporting role, sample feed channel 5 lower ends are connected with sample gas import 1, sample feed channel 5 upper ends are provided with filter core replacement port 7, and the upper end of sample feed channel 5 is connected with sample gas outlet 6, be provided with filter core in this sample feed channel 5, filter core in the present embodiment adopts the steel wire cleaning ball, during promptly concrete enforcement, a plurality of steel wire cleaning balls are filled in 5 of sample feed channel from filter core replacement port 7 constitute filter core.One side of the sample feed channel 5 in the present embodiment is equipped with first jig arm 3, opposite side is equipped with the second heat conduction jig arm 8(as shown in Figure 2), the first above-mentioned jig arm 3 and the second heat conduction jig arm 8 are wrapped in the periphery edge of sample feed channel 5 jointly, what deserves to be explained is: first jig arm 3 in the present embodiment and the second heat conduction jig arm 8 are wrapped up half of sample feed channel 5 periphery edges respectively, and the material of the second heat conduction jig arm 8 is a copper material, the material of first jig arm 3 is a nylon material, experimental results show that this structure helps improving the coal gas stream condensation effect in the sample feed channel 5, and cost is minimum.In addition, the second heat conduction jig arm 8 contacts with the cold junction of refrigerating sheet 9, the hot junction of described refrigerating sheet 9 contacts with a side of heat transfer sheet 12, the opposite side of heat transfer sheet 12 is provided with water-cooled tube 10, this water-cooled tube 10 is used in time taking the heat in refrigerating sheet 9 hot junctions out of the coal gas pretreatment unit, the material of the heat transfer sheet 12 in the present embodiment is a copper material, and above-mentioned refrigerating sheet 9 links to each other with ECU 15, and this ECU 15 is used to control refrigerating sheet 9 work.
A kind of blast furnace coal gas successive analysis system in the present embodiment in use, when coal gas flows through the steel wire cleaning ball in the sample feed channel 5, dust is attached on the steel wire cleaning ball, simultaneously, the effect of refrigerating sheet 9 condensations makes that the condensate moisture in the coal gas stream is a water droplet, this water droplet also is attached on the steel wire cleaning ball, because whole sample feed channel 5 vertically is provided with, water droplet is because of the cause flow of the gravity bottom to sample feed channel 5, in this process, water droplet will be taken away attached to the dust on the steel wire cleaning ball, turn back to together in the blast furnace gas pipeline 14, water droplet can play the effect of cleaning wire cleaning ball, and whole process has realized the self-stip function of coal gas pretreatment unit, makes coal gas pretreatment unit of the present invention need not to carry out timing N
2The blowback operation can realize that serial sampling purifies, and the sample gas after handling through secondary-cleaned device 16 again can enter gas chromatograph 17 and analyze.At the coal gas pretreatment unit experiment Analysis among the present invention, after coal gas stream was handled through this coal gas pretreatment unit, dust content was by 4mg/m
3Drop to 0.5mg/m
3, moisture content is by 8g/m
3Drop to 0.5g/m
3, obvious processing effect.
A kind of blast furnace coal gas successive analysis of the present invention system, the continuous online top gas composition that provides has been provided, compare with the hand sampling chemical examination, have real-time, continuity, advantage such as accurate and visual, the blast furnace section chief is in time judged the working of a furnace, regulates the working of a furnace, the monitoring coal powder injection, judges that water leakage of cooler and the burned hotblast stove of auxiliary hot blast worker etc. all have very big help.This blast furnace coal gas successive analysis system not only analyzes accurately, and simple in structure, maintenance is little, and less investment, and is stable, to blast furnace direct motion steady in a long-term, improve the coal gas utilising efficiency, reduce coke ratio etc. and have vital role, has remarkable economic efficiency.
Below schematically the present invention and embodiment thereof are described, this description does not have restricted, and shown in the accompanying drawing is one of embodiments of the present invention also, and practical structure is not limited thereto.So,, under the situation that does not break away from the invention aim,, all should belong to protection scope of the present invention without creationary frame mode similar and the embodiment of designing to this technical scheme if those of ordinary skill in the art is enlightened by it.
Claims (5)
1. blast furnace coal gas successive analysis system, comprise the coal gas pretreatment unit, secondary-cleaned device (16), gas chromatograph (17) and data processing unit (18), it is characterized in that: described coal gas pretreatment unit bottom is connected with sample gas stopple coupon, the depth of penetration of this sample gas stopple coupon is 1/2 ~ 1/3 of gas line (a 14) caliber, the cut of sample gas stopple coupon is opposite with the coal gas flow path direction, described coal gas pretreatment unit top links to each other with the inlet of secondary-cleaned device (16), the outlet of this secondary-cleaned device (16) is connected to gas chromatograph (17), described data processing unit (18) is connected with gas chromatograph (17), wherein:
Described coal gas pretreatment unit, comprise cylinder (11), cap (13), sample gas import (1), sample gas outlet (6), thermal insulation layer (4) and dehydration dedusting assembly, described cylinder (11) is hollow structure and vertically is provided with, the bottom of this cylinder (11) is fixed with the cap (13) of conical structure, described cap (13) bottom is provided with sample gas import (1), and described cylinder (11) top is provided with sample gas outlet (6); Be provided with thermal insulation layer (4) in the described cylinder (11), this thermal insulation layer (4) inside is provided with dehydration dedusting assembly, described dehydration dedusting assembly comprises fixed muffle (2), first jig arm (3), the second heat conduction jig arm (8), sample feed channel (5), filter core replacement port (7), refrigerating sheet (9), water-cooled tube (10), heat transfer sheet (12) and ECU (15), wherein: described cylinder (11) inside vertically is provided with sample feed channel (5), fixed muffle (2) is passed in described sample feed channel (5) bottom, this sample feed channel (5) lower end is connected with sample gas import (1), sample feed channel (5) upper end is provided with filter core replacement port (7), this upper end is connected with sample gas outlet (6), and is provided with filter core in this sample feed channel (5); One side of described sample feed channel (5) is equipped with first jig arm (3), opposite side is equipped with the second heat conduction jig arm (8), above-mentioned first jig arm (3) and the second heat conduction jig arm (8) are wrapped in the periphery edge of sample feed channel (5) jointly, the described second heat conduction jig arm (8) contacts with the cold junction of refrigerating sheet (9), the hot junction of described refrigerating sheet (9) contacts with a side of heat transfer sheet (12), the opposite side of heat transfer sheet (12) is provided with water-cooled tube (10), above-mentioned refrigerating sheet (9) links to each other with ECU (15), and this ECU (15) is used to control refrigerating sheet (9) work.
2. a kind of blast furnace coal gas successive analysis according to claim 1 system is characterized in that: described secondary-cleaned device (16) is provided with the weldless steel tube of end cap for two ends, and the steel wire cleaning ball is equipped with in this weldless steel tube inside.
3. a kind of blast furnace coal gas successive analysis according to claim 1 system, it is characterized in that: the filter core in the described sample feed channel (5) is the steel wire cleaning ball.
4. according to claim 2 or 3 described a kind of blast furnace coal gas successive analysis systems, it is characterized in that: the material of described second heat conduction jig arm (8) and heat transfer sheet (12) is a copper material.
5. a kind of blast furnace coal gas successive analysis according to claim 4 system, it is characterized in that: the material of described fixed muffle (2) and first jig arm (3) is a nylon material.
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