CN210123399U - Sulfur trioxide online analysis system - Google Patents
Sulfur trioxide online analysis system Download PDFInfo
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- CN210123399U CN210123399U CN201920727052.7U CN201920727052U CN210123399U CN 210123399 U CN210123399 U CN 210123399U CN 201920727052 U CN201920727052 U CN 201920727052U CN 210123399 U CN210123399 U CN 210123399U
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Abstract
The utility model relates to the technical field of environmental protection such as electric power, industrial boiler, in particular to a sulfur trioxide on-line analysis system, which comprises a sampling system, an analysis system and a control system; the sampling system comprises a heating smoke gun, a gas film absorption reactor and a gas-liquid separator which are sequentially connected, and a gas mass flowmeter and an air pump which are sequentially connected at the gas outlet end of the gas-liquid separator; the input end of the heating smoke gun is connected with the flue for sampling, the output end of the heating smoke gun is connected with the gas inlet of the gas film absorption reactor, and the absorption liquid inlet of the absorption reactor is sequentially connected with the first peristaltic pump and the isopropanol storage tank; the analysis system comprises a color development bed, a color development liquid reservoir, a second peristaltic pump and an ultraviolet spectrophotometer which are connected in sequence; the inlet end of the color development bed is connected with the liquid outlet end of the gas-liquid separator; the output end of the control system is respectively connected with the first peristaltic pump, the air suction pump, the second peristaltic pump and the ultraviolet spectrophotometer through signal transmission interfaces.
Description
Technical Field
The utility model relates to an environmental protection technology field such as electric power, industrial boiler specifically is sulfur trioxide on-line analysis system.
Background
The flue gas of coal-fired power plants and industrial boilers often contains SO3，SO3Not only causes the direct reasons of pipeline corrosion and air preheater blockage, but also is an important precursor for forming PM2.5, and is easy to cause atmospheric haze. From 2015, relevant environmental protection departments at various regions in China continuously supply SO of coal-fired boilers3The limit of the emission concentration is 5mg/m3. Partial power plant sprays alkaline agent to reduce SO in flue gas3Concentration, SO3SO of which the concentration is greatly influenced by the load3The concentration of (d) directly determines the amount of alkaline agent sprayed. Therefore, it is very necessary to treat SO in coal-fired flue gas3The concentration is subjected to a real-time strategy, and the method can be used for preventing and treating air preheater blockage, pipeline corrosion, alkaline agent injection quantity and SO for coal-fired power plants and industrial boilers3And the problems of excessive emission and the like provide guidance basis.
At present, the existing SO3The measurement method is mostly an off-line measurement method, and the function of on-line monitoring cannot be realized. Although companies have developed SO based on the isopropyl alcohol sampling standard EPA-8a3The equipment is monitored on line, but the technical principle of the equipment is different from the EPA-8a international standard on certain key parameters, and the accuracy of the measurement is uncertain. Therefore, SO in the coal-fired flue gas is realized3The accurate real-time measurement of the concentration is a key technical problem which is continuously solved in the technical field.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a sulfur trioxide on-line analysis system can realize SO in to coal-fired flue gas3Accurate real-time measurement of concentration, and prevention and treatment of air preheater blockage, pipeline corrosion, alkaline agent injection amount and SO for coal-fired power plant and industrial boiler3And providing guidance basis for the problem of excessive emission.
The utility model discloses a realize through following technical scheme:
the sulfur trioxide online analysis system comprises a sampling system, an analysis system and a control system;
the sampling system comprises a heating smoke gun, a gas film absorption reactor and a gas-liquid separator which are sequentially connected, and a gas mass flowmeter and an air pump which are sequentially connected at the gas outlet end of the gas-liquid separator; the input end of the heating smoke gun is connected with the flue for sampling, the output end of the heating smoke gun is connected with the gas inlet of the gas film absorption reactor, and the absorption liquid inlet of the absorption reactor is sequentially connected with the first peristaltic pump and the isopropanol storage tank;
the analysis system comprises a color development bed, a color development liquid reservoir, a second peristaltic pump and an ultraviolet spectrophotometer which are connected in sequence; the inlet end of the color development bed is connected with the liquid outlet end of the gas-liquid separator;
the output end of the control system is respectively connected with the first peristaltic pump, the air suction pump, the second peristaltic pump and the ultraviolet spectrophotometer through signal transmission interfaces.
Preferably, a thermocouple is arranged in the heating smoke pipe, and the tail end of the heating smoke pipe is connected with the gas inlet of the gas film absorption reactor of the sampling condensation pipe through a filter.
Preferably, the outlet end of the gas film absorption reactor is connected with the inlet end of the gas-liquid separator through a sand core plate.
Preferably, the gas film absorption reactor comprises an outer shell, an inner shell and a liquid flow channel; the outer shell is coaxially sleeved outside the inner shell, and a refrigerating medium is arranged in a cavity between the outer shell and the inner shell; the top of the inner shell is provided with an opening, and the bottom of the inner shell is provided with an outlet; the top of the outer shell is provided with a liquid flow channel communicated with an absorption liquid inlet of the absorption reactor, and an outlet of the liquid flow channel is communicated with an opening of the inner shell; the gas inlet of the gas film absorption reactor is communicated with the opening of the inner shell through the top of the outer shell in a sealing way.
Furthermore, the inner shell include from the top down connect gradually the circular cone section, cylinder section and the radius conic section of setting.
Preferably, the output end of the ultraviolet spectrophotometer is provided with a waste liquid bottle.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses use the heating opium pipe to carry out flue gas sample and keep warm or heat the back, make the sample flue gas in isopropyl alcohol and the absorption reactor carry out the mass transfer reaction through first peristaltic pump in real time to with SO3/H2SO4The vapor is trapped in isopropanol; the air pump provides the power for the flow of the flue gas, SO that the SO is collected3/H2SO4Carrying out color reaction on isopropanol of the steam through a color development bed to generate a purple solution, injecting the purple solution into an ultraviolet spectrophotometer by a second peristaltic pump for testing, and displaying test data in a control system; thereby being capable of adjusting SO in the flue gas3The concentration is monitored on line, and SO in the discharged flue gas is reflected in real time3And (4) concentration.
Furthermore, a sand core plate is arranged at the outlet end of the absorption reactor, and a small amount of non-trapped SO is3/H2SO4The steam and the isopropanol solution can pass through the sand core plate together for mass transfer and trapping again to ensure that SO is3/H2SO4And (4) completely collecting steam.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention;
FIG. 2 is a schematic diagram of the absorption reactor configuration of FIG. 1 and its gas film mass transfer process.
In the figure: 1-thermocouple, 2-heating smoke pipe, 3-isopropanol storage tank, 41-first peristaltic pump, 42-second peristaltic pump, 5-absorption reactor, 6-gas-liquid separator, 7-color development bed, 8-color development liquid storage tank, 9-gas mass flowmeter, 10-air pump, 11-ultraviolet spectrophotometer, 12-waste liquid bottle, 13-control system, 14-signal transmission interface and 15-sand core plate.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are intended to be illustrative and not limiting, and the scope of the present invention should not be limited by the following examples.
The utility model discloses sulfur trioxide online analysis system can gather sulfur trioxide and sulphuric acid steam in the flue gas, shift sulfur trioxide and sulphuric acid steam to vapour and liquid separator in to the sampling collecting fluid that will collect is sent to sulfate radical ion analytic system and is analyzed, finally carries out signal conversion through control system and handles, and accurately show in real time and measure numerical value, the SO in the coal-fired flue gas can be satisfied to this instrument measuring sulfur trioxide concentration range3The concentration is 0.5-250 mg/m3The range of (1).
The utility model discloses a sampling system is based on isopropyl alcohol EPA-8a sampling standard's absorption sampling principle development comes, design SO3/H2SO4steam/SO3 Aerosol absorption reactor 5, SO3/H2SO4steam/SO3The aerosol and the isopropanol are fully contacted and absorbed in an absorption reactor 5 by the principle of air film reaction, and a small amount of unabsorbed sulfuric acid vapor or/SO3The aerosol and the isopropanol pass through the sand core plate 15 together for fully mixing and absorbing again, SO3/H2SO4steam/SO3The aerosol can ensure SO in the flue gas in the absorption reactor3Sulfuric acid vapor and SO3The aerosol is completely absorbed.
The gas film absorption reactor 5 is controlled to be in an environment with the temperature of-2-2 ℃ by a refrigerator or an ice bath, the flue gas enters from the right upper part of the gas film absorption reactor 5, the IPA solution enters from the upper end of the gas film absorption reactor 5, the flue gas and the IPA solution form a gas film in the gas film absorption reactor 5, and the SO in the flue gas3The sulfuric acid mist is subjected to mass transfer absorption in the air film and enters the IPA solution, and a small amount of unabsorbed sulfuric acid mist and SO3 aerosol pass through a sand core plate at the bottom of the air film absorption reactor 5 along with the flue gas and the IPA solution for reabsorption.
The utility model discloses a sulfate ion analytic system is based on sulfate ion ultraviolet analysis's principle to set up color development bed, color development liquid reservoir, peristaltic pump and ultraviolet spectrophotometer, the sampling collecting liquid that waits that the sampling system to collect carries out the color development reaction through the color development bed, generates color development liquid, measures color development liquid with ultraviolet spectrophotometer afterwards. The measurement principle is the sulfate ion ultraviolet measurement principle.
The utility model discloses with sulfate ion analytic system measuring data transmission to control system, control system carries out data conversion and shows measurement concentration. Specifically, the absorbance a measured by the analysis system is converted into the sulfate ion concentration in the absorption liquid through a standard curve of barium chloranilate-sulfate, the measured sulfate ion concentration is transmitted into the control system, and the SO in the flue gas is converted into the volume of the collected gas and the volume of the IPA absorption liquid controlled by the first peristaltic pump 41 through combination of the collected gas volume and the volume of the IPA absorption liquid controlled by the first peristaltic pump 413Concentration of and use of the SO3The concentration is displayed in the control system 13.
The sulfur trioxide on-line analysis system of the utility model is specifically as follows,
as shown in fig. 1, the analysis system includes a sampling system, an analysis system, and a control system 13; the sampling system consists of a heating smoking pipe 2, an isopropanol storage tank 3, a peristaltic pump 4, an absorption reactor 5, a gas-liquid separator 6, a gas mass flowmeter 9 and an air pump 10, and the analysis system consists of a color development bed 7, a color development liquid reservoir 8, the peristaltic pump 4, an ultraviolet spectrophotometer 11 and a waste liquid bottle 12.
In practical application, the air pump 10 and the first peristaltic pump 41 are started to sample, and SO is contained3/H2SO4The vapor gas and the isopropanol are subjected to mass transfer reaction in the absorption reactor 5, and SO is introduced3/H2SO4The vapor was trapped in isopropanol. Subsequently, SO is trapped3/H2SO4The isopropyl alcohol of the steam reacts with the color developing agent in the color developing bed 7 through the color developing bed 7 to generate a purple substance, the purple substance enters the color developing liquid reservoir 8, the color developing liquid is pumped into the ultraviolet spectrophotometer 11 by the second peristaltic pump 42 for testing, the test data is transmitted into the control system 13 through the signal transmission line for data processing and display, and the tested liquid is discharged into the waste liquid bottle 12. Isopropyl alcohol storage tank 3 stores isopropyl alcohol with a volume concentration of 60% or moreAqueous propanol or isopropanol. The output time of the online analysis system is 1-10 seconds. Wherein, the filter is used for filtering dust in the flue gas; the thermocouple 1 arranged in the heating smoke pipe 2 is used for feeding back the temperature in the heating smoke pipe 2, so that the temperature is controlled at 260-300 ℃.
FIG. 2 shows SO3/H2SO4The mass transfer process of the steam and the isopropanol in the absorption reactor 5, and the ice bath environment required by the absorption reactor 5 can be a circulating ice-water mixture provided for the outer frame of the absorption reactor 5, or a refrigeration system, such as an air-conditioning refrigerator, is arranged to control the environment of the absorption reactor 5 to be-2 ℃. It can be seen from the figure that isopropanol, i.e. IPA, forms a liquid film with the flue gas in the absorption reactor, most of the SO3/H2SO4The vapor is absorbed and trapped by isopropanol on the liquid film, and a small amount of non-trapped SO3/H2SO4The steam together with the isopropanol is again trapped by mass transfer through the sand core plate 15. The absorption reactor 5 can make isopropanol and SO3/H2SO4The steam carries out full mass transfer to ensure SO3/H2SO4And (4) completely collecting steam.
Claims (6)
1. The online sulfur trioxide analysis system is characterized by comprising a sampling system, an analysis system and a control system (13);
the sampling system comprises a heating smoke gun (2), a gas film absorption reactor (5) and a gas-liquid separator (6) which are sequentially connected, and a gas mass flowmeter (9) and an air pump (10) which are sequentially connected with the gas outlet end of the gas-liquid separator (6); the input end of the heating smoke gun (2) is connected with a flue for sampling, the output end of the heating smoke gun is connected with a gas inlet of the gas film absorption reactor (5), and an absorption liquid inlet of the absorption reactor (5) is sequentially connected with a first peristaltic pump (41) and an isopropanol storage tank (3);
the analysis system comprises a color development bed (7), a color development liquid reservoir (8), a second peristaltic pump (42) and an ultraviolet spectrophotometer (11) which are connected in sequence; the inlet end of the color development bed (7) is connected with the liquid outlet end of the gas-liquid separator (6);
the output end of the control system is respectively connected with the first peristaltic pump (41), the air pump (10), the second peristaltic pump (42) and the ultraviolet spectrophotometer (11) through a signal transmission interface (14).
2. The online sulfur trioxide analysis system according to claim 1, characterized in that a thermocouple (1) is arranged in the heating pipe (2), and the end of the heating pipe (2) is connected with the gas inlet of the gas film absorption reactor (5) of the sampling condenser pipe through a filter.
3. The online sulfur trioxide analysis system according to claim 1, characterized in that the outlet end of the gas film absorption reactor (5) is connected with the inlet end of the gas-liquid separator (6) through a sand core plate (15).
4. The online sulfur trioxide analysis system according to claim 1, characterized in that the gas film absorption reactor (5) comprises an outer shell (51), an inner shell (52) and a liquid flow channel (53); the outer shell (51) is coaxially sleeved outside the inner shell (52), and a refrigerating medium is arranged in a cavity between the outer shell (51) and the inner shell (52); the top of the inner shell (52) is provided with an opening, and the bottom of the inner shell is provided with an outlet; the top of the outer shell (51) is provided with a liquid flow channel (53) communicated with an absorption liquid inlet of the absorption reactor (5), and an outlet of the liquid flow channel (53) is communicated with an opening of the inner shell (52); the gas inlet of the gas film absorption reactor (5) is communicated with the opening of the inner shell (52) through the top of the outer shell (51) in a sealing way.
5. The online sulfur trioxide analysis system according to claim 4, characterized in that the inner shell (52) comprises a conical section, a cylindrical section and an inverted conical section which are connected in sequence from top to bottom.
6. The online analysis system for sulfur trioxide according to claim 1, characterized in that the output of the ultraviolet spectrophotometer (11) is provided with a waste liquid bottle (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920727052.7U CN210123399U (en) | 2019-05-20 | 2019-05-20 | Sulfur trioxide online analysis system |
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| CN201920727052.7U CN210123399U (en) | 2019-05-20 | 2019-05-20 | Sulfur trioxide online analysis system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044835A (en) * | 2019-05-20 | 2019-07-23 | 华能国际电力股份有限公司 | Sulfur trioxide on-line analysis system and method |
| CN112147287A (en) * | 2020-10-21 | 2020-12-29 | 西安热工研究院有限公司 | Online measurement system and method for HCl in flue gas |
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2019
- 2019-05-20 CN CN201920727052.7U patent/CN210123399U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044835A (en) * | 2019-05-20 | 2019-07-23 | 华能国际电力股份有限公司 | Sulfur trioxide on-line analysis system and method |
| CN110044835B (en) * | 2019-05-20 | 2022-06-14 | 华能国际电力股份有限公司 | Sulfur trioxide online analysis system and method |
| CN112147287A (en) * | 2020-10-21 | 2020-12-29 | 西安热工研究院有限公司 | Online measurement system and method for HCl in flue gas |
| CN112147287B (en) * | 2020-10-21 | 2024-01-23 | 西安热工研究院有限公司 | Online measurement system and method for HCl in flue gas |
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