CN115078346A - H in coal gas 2 S content detection system and method - Google Patents
H in coal gas 2 S content detection system and method Download PDFInfo
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- 239000003034 coal gas Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 152
- 239000006096 absorbing agent Substances 0.000 claims abstract description 77
- 238000004458 analytical method Methods 0.000 claims abstract description 25
- 238000010521 absorption reaction Methods 0.000 claims description 87
- 238000006243 chemical reaction Methods 0.000 claims description 80
- 238000003756 stirring Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 12
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 103
- 239000007921 spray Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003086 colorant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
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Abstract
The invention relates to H in coal gas 2 S content detection technical field, in particular to H in coal gas 2 S content detection system and method. A system for detecting the content of H2S in coal gas comprises a coal gas inlet, an air extracting pump, an absorber, a flow meter, a coal gas outlet, a liquid volume measuring instrument and liquid component analysis equipment: the absorber is one or more than one absorber connected in series, a blast furnace gas pipeline is connected with a gas inlet, and the gas inlet, the air extracting pump, the absorber, the flow meter and the gas outlet are sequentially connected through a conveying pipe; the liquid volume measuring instrument is connected with the absorber through a conveying pipe, and the liquid volume measuring instrument is connected with the liquid component analysis equipment through the conveying pipe. The method greatly improves the accuracy of the detection result, and has the advantages of low cost, short time consumption and high efficiency.
Description
Technical Field
The invention relates to H in coal gas 2 The technical field of S content detection, in particular to H in coal gas 2 S content detection system and method.
Background
Iron and steel enterprises commonly adopt self-produced blast furnace and coke oven gas which are mixed and then used as fuel gas of a heating furnace. In recent years, a plurality of blockages appear on gas filter screens in heating furnace gas pipelines of some steel enterprises, and the smooth production is seriously influenced. According to investigation, the blockage of the filter screen of the gas pipeline belongs to corrosion products, and the main components of the blockage are elemental sulfur and ammonium chloride. The sulfur source is mainly H in coal gas by analysis 2 S is generated by chemical reaction in the conveying process. It can be seen that H is contained in the gas 2 The presence of S poses a serious hazard to production.
Based on the problems, H in coal gas is researched 2 The S content is of great significance. Coke oven gas is generally treated in a desulfurization process before use, so that H in the desulfurized gas is 2 The content of S is extremely low, the results of detecting the trace elements by adopting a traditional conventional method are not accurate enough, when the current advanced methods such as an infrared method or a laser method are adopted for analysis and test, the content is extremely low, the trace elements are easily interfered by other gases, the test and analysis results are also inaccurate, and in practice, the results of measuring the components of the same kind of coal gas by adopting different gas analyzers even have a difference of more than 50 percent and are obviously beyond the scope of coal gas component fluctuation; on the other hand, whether infrared or laser methods, H is present in the test feed gas 2 For S content, preheating of the equipment is required, and H of a gas sample is sometimes measured 2 The S content takes 2 hours; in addition, infrared and laser gas analyzers are expensive, the price of the inlet gas analyzing equipment is over a million yuan, and the main consumables such as probes and the like in the infrared and laser gas analyzers are required to be used for yearsThe replacement, consumable replacement and verification are expensive, which are some of the disadvantages of conventional gas analyzers. Relatively speaking, the method for absorbing harmful trace elements in the coal gas by adopting the pre-configured absorption liquid is a more accurate, reliable, convenient and time-saving method, but the conventional coal gas absorption system and the conventional coal gas absorption method have the defects that the harmful components in the coal gas are not completely absorbed due to insufficient contact between the gas flow and the absorption liquid and short contact time in the absorption process, and the problem can not be thoroughly solved all the time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a system and a method for detecting the content of H2S in coal gas. The method greatly improves the accuracy of the detection result, and has the advantages of low cost, short time consumption and high efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
h in coal gas 2 The S content detection system comprises a gas inlet, an air extracting pump, an absorber, a flow meter, a gas outlet, a liquid volume measuring instrument and liquid component analysis equipment, wherein the gas inlet comprises a gas inlet pipe, a gas extracting pump, an absorber, a flow meter and a liquid volume measuring instrument: the absorber is one or more than one absorber connected in series, a blast furnace gas pipeline is connected with a gas inlet, and the gas inlet, the air extracting pump, the absorber, the flow meter and the gas outlet are sequentially connected through a conveying pipe; the liquid volume measuring instrument is connected with the absorber through a conveying pipe, and the liquid volume measuring instrument is connected with the liquid component analysis equipment through the conveying pipe.
The absorber comprises a first reaction tank and a second reaction tank, the first reaction tank and the second reaction tank are identical in structure, and the first reaction tank and the second reaction tank are connected through a pipeline.
The bottom of each of the first reaction tank and the second reaction tank is provided with a gas inlet and a liquid outlet, the top of each of the first reaction tank and the second reaction tank is provided with a gas outlet, and the gas outlet at the top of the first reaction tank is connected with the gas inlet at the bottom of the second reaction tank through a Z-shaped gas pipeline.
The first reaction tank and the second reaction tank respectively comprise a tank body, a hollow rotating shaft, an electronic rotator, a stirring paddle and a spraying pipeline; the electronic rotator is connected with a hollow rotating shaft, the hollow rotating shaft is connected with a stirring paddle, and the stirring paddle is positioned in the tank body; the spraying pipeline extends into the tank body, and the end part of the spraying pipeline is provided with a spraying head.
The stirring paddle is internally provided with an air outlet.
And a circulating water pump is arranged on the spraying pipeline.
H in coal gas 2 The S content detection method specifically comprises the following steps:
1) preparing absorption liquid
Preparing a mixed solution with 5% -8% NaOH concentration and 2% -5% KOH concentration by using deionized water as an absorption liquid, and adding a few drops of phenolphthalein indicator to complete the preparation of the absorption liquid; determination of H in absorption liquid 2 Concentration of S, denoted as W 1 Unit μ g/mL; adding the prepared absorption liquid into an absorber reaction tank, so that the liquid level of the absorption liquid reaches more than half of the height of the tank body;
2) connecting gas absorption system
The gas inlet, the air extracting pump, the absorber, the flow meter and the gas outlet are respectively connected in sequence by adopting a gas conveying pipe, and the absorber, the liquid volume measuring instrument and the liquid component analysis equipment are respectively connected in sequence by adopting a liquid conveying pipe;
3) h in coal gas 2 S on-line absorption
Opening an air extraction pump on a blast furnace gas pipeline, and adjusting the air extraction speed to 1.8-2.6 m 3 H; opening an electronic rotator in the absorber, and adjusting the rotating speed to 120-160 r/min;
opening a valve at a coal gas inlet, opening a circulating water pump, and recording the numerical value of the flow meter at the moment as V 1 The unit L;
observing the colors of the absorption liquid in the tank bodies of the reaction tanks along with the reaction, wherein the absorption liquid in one tank gradually turns red from colorless, the absorption liquid in the other tank stops introducing coal gas after the absorption liquid in the other tank does not change color or slightly changes pink, closing a coal gas inlet valve and an air suction pump, recording the numerical value of the flow meter again, and recording the numerical value as V 2 The unit L;
4) absorption liquid volume measurement and composition analysis
Opening the liquid outlet valve of the absorber reaction tank, discharging all the absorption liquid out of the absorber, and allowing the absorption liquid to enter the liquid volume meterMeasuring the volume of the absorption liquid by a measuring instrument, and recording the measured volume of the absorption liquid as Q in unit mL; after the volume is measured, the liquid volume measuring instrument is led into the liquid component analysis equipment to measure H 2 Concentration of S, denoted as W 2 Unit μ g/mL;
5) calculate H 2 S content
Measured data V 1 、V 2 、Q、W 1 、W 2 By bringing into the following formula, for H in the gas 2 Calculating the content of S to obtain a final result;
in the formula: x is H in coal gas 2 S content in mg/m 3 。
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for producing H in coal gas 2 The S content detecting system and method solves the problem of H content in coal gas measured by infrared and laser gas analyzers 2 When S is present, due to H 2 The S content is too low, the interference of other gases is caused, the measurement error is large, the accuracy is not high, and the problems of too long test time and high cost caused by preheating equipment are solved. Meanwhile, the problem of inaccurate detection result caused by incomplete absorption of an absorption device when the components of the gas are measured by a conventional chemical method is solved. The method adopts a special absorber structure, realizes the dispersion of small gas bubbles in the absorption liquid by the high-speed rotation of a stirring rotor with an air inlet, increases the contact stroke of the bubbles and the absorption liquid, provides reaction kinetic conditions, and ensures that H is absorbed by the gas in the absorption liquid 2 S is absorbed more quickly and sufficiently; in addition, the circulating water pump sprays the absorption liquid through a spraying device on the upper part of the reaction tank, so that the liquid circulation is accelerated, and a large amount of manufactured vaporific water drops further react with gas; in addition, the structure of the gas absorber adopts the series connection of the double reaction tanks, thereby ensuring that harmful elements in the gas are absorbed more thoroughly. Harmful elements in the coal gas are absorbed by the device and measured, and the measurement error is reduced from more than 50 percent to less than 0.5 percentThe testing time is shortened from 2 hours to 0.5 hour, so that the accuracy is extremely high, the cost is low, the time consumption is short, and the efficiency is high.
Drawings
FIG. 1 is a schematic structural diagram of embodiments 1 and 3 of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
fig. 3 is a schematic diagram of the absorber structure of the present invention.
In the figure: a gas inlet, B air pump, C first absorber, C2 second absorber, D flow meter, E gas outlet, F liquid volume measuring instrument, G liquid component analysis equipment, first fixed air inlet, seam of first hollow rotating shaft and fixed air inlet, first electronic rotator, first hollow rotating shaft, first stirring paddle, first reaction tank body, first absorbing liquid inlet, first air outlet, first stirring paddle built-in air outlet, second stirring paddle built-in air outlet, air volume measuring instrument, and G liquid component analysis equipment,
A first spray header,
A first spray pipeline,
A first circulating water pump,
A first liquid discharge port,
A Z-shaped gas pipeline,
A second fixed air inlet,
The joint of the second hollow rotating shaft and the second fixed air inlet,
A second electronic rotator,
A second hollow rotating shaft,
A second liquid outlet,
A second stirring paddle,
A gas outlet hole is arranged in the third stirring paddle,
A gas outlet hole is arranged in the fourth stirring paddle,
A second absorption liquid inlet,
A second reaction tank body,
A second air outlet,
A second spray header,
A second spray pipeline,
And a second circulating water pump.
Detailed Description
The invention discloses H in coal gas 2 S content detection system and method. Those skilled in the art can use the contents to properly modify the process parametersNow. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The following further illustrates embodiments of the invention, but is not intended to limit the scope of the invention.
Example 1:
as shown in figure 1, H in a coal gas 2 The S content detection system comprises a coal gas inlet A, an air pump B, a first absorber C, a flow meter D, a coal gas outlet E, a liquid volume measuring instrument F and liquid component analysis equipment G. The blast furnace gas pipeline is connected with a gas inlet A, and the gas inlet A, the air pump B, the first absorber C, the flow meter D and the gas outlet E are sequentially connected through a conveying pipe. The liquid volume measuring instrument F is connected with the absorber C through a delivery pipe, and the liquid volume measuring instrument F is connected with the liquid component analysis device G through a delivery pipe.
As shown in fig. 3, the first absorber C is made of an acid-base corrosion resistant material, and includes a first reaction tank and a second reaction tank. The first reaction tank comprises a first reaction tank body, a first hollow rotating shaft, a first electronic rotator, a first stirring paddle and a first spray pipeline
The top of the first reaction tank body is provided with a first air outlet, the upper part of the first reaction tank body is provided with a first absorption liquid inlet (seventh), and the bottom is provided with a first drainage outlet
One end of a first fixed air inlet is connected with a blast furnace gas pipeline, the other end of the first fixed air inlet is connected with a seam of the fixed air inlet through a first hollow rotating shaft, the first fixed air inlet is connected with a first hollow rotating shaft, a first electronic rotator is connected with the first hollow rotating shaft, and the first hollow rotating shaft extends into a tank body of a first reaction tank and is connected with a first stirring paddle. And the first hollow rotating shaft (r) is connected with the first reaction tank body (c) in a rotating shaft sealing mode, so that the first hollow rotating shaft (r) can rotate, and gas and liquid do not leak.
The first stirring paddle is provided with a first stirring paddle built-in air outlet hole Nc and a second stirring paddle built-in air outlet hole R which are communicated with the first hollow rotating shaft Nc. First spray pipe
Is provided with a first circulating water pump
First spray pipe
One end of the first reaction tank extends into the lower part of the first reaction tank body, the other end of the first reaction tank extends into the first reaction tank body, and the end part of the first reaction tank is provided with a first spray head
The second reaction tank comprises a second fixed air inlet
Joint of second hollow rotary shaft and second fixed air inlet
Second electronic rotator
Second hollow rotating shaft
Second liquid outlet
Second stirring paddle
Built-in air outlet of third stirring paddle
Air outlet hole arranged in fourth stirring paddle
A second absorption liquid inlet
Second reaction tank body
Second air outlet
Second spray header
Second spray pipe
And a second circulating water pump
The structure and the connection relation of the components are completely the same as those of the first reaction tank, and are not described in detail.
First reaction tank body, first air outlet at top and Z-shaped coal gas pipeline
One end of the Z-shaped coal gas pipeline is connected
The other end of the first reaction tank and the tank body of the second reaction tank
Bottom second fixed air inlet
And the first reaction tank and the second reaction tank are connected in series.
Air outlet hole (c) in first stirring paddle, air outlet hole (c) in second stirring paddle and air outlet hole (c) in third stirring paddle
Air outlet hole arranged in fourth stirring paddle
Are all anti-backflow holes.
The first stirring paddle and the second stirring paddle
The installation positions of the two reaction tanks are respectively close to the first reaction tank body and the second reaction tank body as much as possible
The bottom of the rotary table can be ensured to rotate.
H in coal gas 2 The S content detection method comprises the following steps:
1) preparing 4L of absorption liquid with the concentration of 5% NaOH and 5% KOH by using deionized water, adding 20 drops of phenolphthalein indicator, and measuring H in the absorption liquid 2 Concentration of S, denoted as W 1 (unit. mu.g/mL). At a gas production point of a certain steel mill, the prepared absorption liquid is added into an absorber reaction tank, so that the liquid level of the absorption liquid reaches above 1/2 of the height of the tank body.
2) The gas inlet a, the air pump B, the first absorber C, the flow meter D and the gas outlet E were connected in order by a gas transport pipe according to fig. 1, and the absorber C, the liquid volume measuring instrument F and the liquid component analyzing device G were connected in order by a liquid transport pipe.
3) The air pump is opened, and the air pumping speed is adjusted to 1.8m 3 Opening a valve at a coal gas inlet, opening an electronic rotator in the first absorber C, adjusting the rotating speed to 120r/min, opening a circulating water pump, and recording the value of a flow meter at the moment, wherein the value is marked as V 1 (unit L). Observing the colors of the absorption liquid in the tank bodies of the reaction tanks along with the reaction, wherein the absorption liquid in one tank gradually turns red from colorless, the absorption liquid in the other tank does not change color, stopping introducing the coal gas, closing a coal gas inlet valve and an air suction pump, recording the numerical value of the flow meter again, and recording as V 2 (unit L).
4) And opening a liquid outlet valve of the absorber reaction tank, discharging all the absorption liquid out of the absorber, and entering a liquid volume measuring instrument to measure the volume of the absorption liquid, wherein the measured volume of the liquid is recorded as Q (unit mL). After the volume is measured, the liquid is introduced into a liquid component analysis device to measure H 2 Concentration of S, denoted as W 2 (unit. mu.g/mL).
Table 1 example 1 gas absorption test data
5) Calculating H 2 S content
In the formula: x is H in coal gas 2 S content in mg/m 3 。
Substituting the measured data into formula (1) for H in gas 2 The S content X is calculated to obtain the final result, H in the coal gas 2 The S content is 15.91mg/m 3 。
Example 2:
as shown in figure 2, H in a coal gas 2 The S content detection system comprises a gas inlet A, an air extracting pump B, a first absorber C, a second absorber C2, a flow meter D, a gas outlet E, a liquid volume measuring instrument F and liquid component analysis equipment G. The blast furnace gas pipeline is connected with a gas inlet A, the gas inlet A, an air extracting pump B, a first absorber C,The second absorber C2 and the flow meter D are connected with the coal gas outlet E in sequence through a conveying pipe. The liquid volume measuring instrument F is connected to the absorber C through a delivery pipe, and the liquid volume measuring instrument F is connected to the liquid component analyzing apparatus G through a delivery pipe.
The first absorber C and the second absorber C2 have the same structure, and the absorber of embodiment 2 has the same structure as the absorber of embodiment 1, and thus the description thereof is omitted.
H in coal gas 2 The S content detection method comprises the following steps:
1) deionized water is adopted to prepare 15 percent NaOH +5 percent Ca (OH) 2 Adding 40 drops of phenolphthalein indicator into the absorption liquid 8L, and measuring H in the absorption liquid 2 Concentration of S, denoted as W 1 (unit. mu.g/mL).
2) At a gas production point of blast furnace gas of a certain steel mill, the devices are sequentially connected by adopting gas conveying pipes according to the sequence in figure 3, namely a gas inlet A, a gas suction pump B, a first absorber C, a second absorber C2, a flow meter D and a gas outlet E, and the absorber C, a liquid volume measuring instrument F and a liquid component analysis device G are sequentially connected by adopting liquid conveying pipes.
In which, in contrast to example 1, two identical absorber structures, C and C respectively, are connected in series 2 . Weighing prepared absorption liquid with the same volume, and respectively adding C and C 2 In the two absorbers, the liquid level of the absorption liquid reaches above 1/2 of the height of the tank body.
3) The air pump is opened, and the air pumping speed is adjusted to 2.6m 3 Opening a valve at a coal gas inlet, and respectively opening a first absorber C and a second absorber C 2 The rotating speed of the electronic rotator is adjusted to 160r/min, the circulating water pump is opened, and the value of the flow meter at the moment is recorded as V 1 (unit L). Observing the color of the absorption liquid in the tank body of the reaction tank along with the reaction, wherein the absorption liquid in one tank in the first absorber C gradually turns red from colorless, and the absorption liquid in the other tank does not change color; the absorption liquid in two tanks in the second absorber C2 is not discolored, the gas introduction is stopped, a gas inlet valve and an air pump are closed, the value of the flow meter is recorded again and is recorded as V 2 (unit L).
4) OpenAnd (3) discharging all the absorption liquid out of the absorber through a liquid outlet valve of the reaction tank of the first absorber C, and measuring the volume of the absorption liquid by entering a liquid volume measuring instrument, wherein the measured liquid volume is marked as Q (unit mL). After the volume is measured, the liquid is introduced into a liquid component analysis device to measure H 2 Concentration of S, denoted as W 2 (unit. mu.g/mL). At the same time, the absorption liquid in the second absorber C2 was taken out, and its H content was measured by a liquid component analyzer 2 Concentration of S, denoted as W 3 (unit. mu.g/mL).
Table 2 example 2 gas absorption test data
Calculated by experimental data from W 1 、W 2 And W 3 As can be seen from the three data items, W 3 Phase comparison W 1 Hardly increases, while W 2 Phase comparison W 1 The significant increase indicates that the first C absorber at the front end has removed H in the gas 2 The S absorption was very complete. Through calculation of three items of data, the first C absorber absorbs H 2 The absorption of S was 99.80%. Further combined with other test data to calculate H in the gas 2 The S content is 16.39mg/m 3 。
Example 3:
the system used in embodiment 3 is completely the same as that used in embodiment 1, and is not described again.
H in coal gas 2 The S content detection method comprises the following steps:
1) preparing 4L of absorption liquid with the concentration of 6% NaOH and 3% KOH by using deionized water, adding 20 drops of phenolphthalein indicator, and measuring H in the absorption liquid 2 Concentration of S, denoted as W 1 (unit. mu.g/mL). At a gas production point of a certain steel mill, the prepared absorption liquid is added into an absorber reaction tank, so that the liquid level of the absorption liquid reaches above 1/2 of the height of the tank body. .
2) A three-way pipeline is placed at a gas inlet A, the gas inlet A is divided into two branches, one branch is sequentially connected with a suction pump B, a first absorber C, a flow meter D and a gas outlet E by a gas conveying pipe according to a figure 1, the gas outlet E is connected with a high-temperature infrared gas analyzer by a pipeline, the other branch of the gas inlet A is sequentially connected with another suction pump and a high-temperature infrared gas analyzer, and a liquid conveying pipe is used for sequentially connecting the first absorber C, a liquid volume measuring instrument F and a liquid component analysis device G respectively. .
3) Opening the air pump, and simultaneously adjusting the air pumping speed of the two air pumps B to 2.2m 3 H, simultaneously starting two high-temperature infrared gas analyzers, opening a valve at a gas inlet A, opening an electronic rotator in an absorber, adjusting the rotating speed to 140r/min, opening a circulating water pump, recording the numerical value of a flow meter at the moment, and recording the numerical value as V 1 (unit L). And (3) observing the colors of the absorption liquid in the tank bodies of the reaction tanks along with the reaction when the alkali liquor concentration exceeds the color change range of the indicator, wherein the absorption liquid in one tank gradually turns red from colorless, the absorption liquid in the other tank does not change color, stopping introducing the coal gas, closing a coal gas inlet valve, an air suction pump B and a high-temperature infrared gas analyzer, recording the numerical value of the flow meter again, and recording the numerical value as V 2 (unit L).
4) And opening a drain valve of a reaction tank of the first absorber C, completely draining the absorption liquid out of the first absorber C, and entering a liquid volume measuring instrument to measure the volume of the absorption liquid, wherein the measured volume of the liquid is marked as Q (unit mL). After the volume is measured, the liquid is introduced into a liquid component analysis device to measure H 2 Concentration of S, denoted as W 2 (unit. mu.g/mL). .
Table 3 example 3 gas absorption test data
5) Calculate H 2 S content
In the formula: x is H in coal gas 2 S content in mg/m 3 。
By measurement ofSubstituting the data into formula (1) for H in the gas 2 The S content X is calculated to obtain the final result, H in the coal gas 2 The S content is 15.74mg/m 3 . Recording the values measured by two infrared gas analyzers, and measuring H by an analyzer connected with a gas outlet at the tail end of the system 2 The S concentration is 0.03mg/m 3 Thus, it can be seen that the system has been used to remove H from gas 2 S is very completely absorbed. H is measured by an analyzer connected with a tee joint of the coal gas inlet 2 The S concentration is 9.23mg/m 3 Lower than H in the gas measured by the system 2 S concentration, and the deviation is large, it can be seen that the results obtained using different methods are very different, whereas the system and method used in this experiment, using chemical absorption, may only be slightly lower but not significantly higher than the true value. Therefore, the measurement result deviation of the high-temperature infrared analyzer can be judged to be large.
The invention provides a method for producing H in coal gas 2 The S content detecting system and method solves the problem of H content in coal gas measured by infrared and laser gas analyzers 2 When S is present, due to H 2 The S content is too low, the interference of other gases is caused, the measurement error is large, the accuracy is not high, and the problems of too long test time and high cost caused by preheating equipment are solved. Meanwhile, the problem of inaccurate detection result caused by incomplete absorption of an absorption device when the components of the gas are measured by a conventional chemical method is solved. The method adopts a special absorber structure, realizes the dispersion of small gas bubbles in the absorption liquid by the high-speed rotation of a stirring rotor with an air inlet, increases the contact stroke of the bubbles and the absorption liquid, provides reaction kinetic conditions, and ensures that H is absorbed by the gas in the absorption liquid 2 S is absorbed more quickly and sufficiently; in addition, the circulating water pump sprays the absorption liquid through a spraying device on the upper part of the reaction tank, so that the liquid circulation is accelerated, and a large amount of manufactured vaporific water drops further react with gas; in addition, the structure of the gas absorber adopts the series connection of the double reaction tanks, thereby ensuring that harmful elements in the gas are absorbed more thoroughly. Harmful elements in the coal gas are absorbed by the device and are measured, the measurement error is reduced to be below 0.5% from more than 50% at most, the test time is shortened to be 0.5 hour from 2 hours, the accuracy is extremely high, the cost is low, and the consumed time is shortAnd the efficiency is high.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. H in coal gas 2 The S content detection system is characterized by comprising a gas inlet, an air extracting pump, an absorber, a flowmeter, a gas outlet, a liquid volume measuring instrument and liquid component analysis equipment: the absorber is one or more than one absorber connected in series, a blast furnace gas pipeline is connected with a gas inlet, and the gas inlet, the air extracting pump, the absorber, the flow meter and the gas outlet are sequentially connected through a conveying pipe; the liquid volume measuring instrument is connected with the absorber through a conveying pipe, and the liquid volume measuring instrument is connected with the liquid component analysis equipment through the conveying pipe.
2. The process of claim 1 wherein H is in gas 2 The S content detection system is characterized in that the absorber comprises a first reaction tank and a second reaction tank, the first reaction tank and the second reaction tank are identical in structure, and the first reaction tank and the second reaction tank are connected through a pipeline.
3. The process of claim 2 wherein H is in gas 2 The S content detection system is characterized in that the bottoms of the first reaction tank and the second reaction tank are respectively provided with an air inlet and a liquid outlet, the tops of the first reaction tank and the second reaction tank are respectively provided with an air outlet, and the air outlet at the top of the first reaction tank is connected with the air inlet at the bottom of the second reaction tank through a Z-shaped gas pipeline.
4. The process of claim 2 wherein H is in gas 2 The S content detection system is characterized in that the first reaction tank and the second reaction tank respectively comprise a tank body, a hollow rotating shaft, an electronic rotator, a stirring paddle and a spraying pipeline; the electronic rotator is connected with a hollow rotating shaft, and the hollow rotating shaft is connected with a stirring paddleThe stirring paddle is positioned in the tank body; the spraying pipeline extends into the tank body, and the end part of the spraying pipeline is provided with a spraying head.
5. The method of claim 4, wherein H is in gas 2 The S content detection system is characterized in that an air outlet is arranged in the stirring paddle.
6. The method of claim 4, wherein H is in gas 2 The S content detection system is characterized in that a circulating water pump is arranged on the spraying pipeline.
7. H in coal gas based on any one of claims 1-6 2 The method of the S content detection system is characterized by comprising the following steps:
1) preparing absorption liquid
Preparing a mixed solution with 5% -8% NaOH concentration and 2% -5% KOH concentration by using deionized water as an absorption liquid, and adding a few drops of phenolphthalein indicator to complete the preparation of the absorption liquid; determination of H in absorption liquid 2 S concentration, denoted as W 1 Unit μ g/mL; adding the prepared absorption liquid into an absorber reaction tank, so that the liquid level of the absorption liquid reaches more than half of the height of the tank body;
2) connecting gas absorption system
The gas inlet, the air extracting pump, the absorber, the flow meter and the gas outlet are respectively connected in sequence by adopting a gas conveying pipe, and the absorber, the liquid volume measuring instrument and the liquid component analysis equipment are respectively connected in sequence by adopting a liquid conveying pipe;
3) h in coal gas 2 S on-line absorption
Opening the air pump on the blast furnace gas pipeline, opening the valve at the gas inlet, opening the electronic rotator in the absorber, opening the circulating water pump, and recording the value of the flow meter at the moment as V 1 The unit L;
observing the color of the absorption liquid in the tank body of the reaction tank along with the reaction, wherein the absorption liquid in one tank gradually turns red from colorless, the absorption liquid in the other tank does not change color or stops introducing coal gas after the absorption liquid begins to change color, and the introduction of the coal gas is closedThe mouth valve and the air pump record the value of the flow meter again and record the value as V 2 The unit L;
4) absorption liquid volume measurement and composition analysis
Opening a liquid outlet valve of an absorber reaction tank, discharging all absorption liquid out of an absorber, and entering a liquid volume measuring instrument to measure the volume of the absorption liquid, wherein the measured volume of the liquid is marked as Q and the unit of mL; after the volume is measured, the liquid volume measuring instrument is led into the liquid component analysis equipment to measure H 2 Concentration of S, denoted as W 2 Unit μ g/mL;
5) calculate H 2 S content
Measured data V 1 、V 2 、Q、W 1 、W 2 By bringing into the following formula, for H in the gas 2 Calculating the content of S to obtain a final result;
in the formula: x is H in coal gas 2 S content in mg/m 3 。
8. The process of claim 7 wherein H is in gas 2 The S content detection method is characterized in that in the step 3), an air suction pump on a blast furnace gas pipeline is opened, and the air suction speed is adjusted to 1.8-2.6 m 3 H; and opening the electronic rotator in the absorber, and adjusting the rotating speed to 120-160 r/min.
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