CN210487692U - Negative pressure formula pollution sources VOC on-line monitoring system - Google Patents
Negative pressure formula pollution sources VOC on-line monitoring system Download PDFInfo
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- CN210487692U CN210487692U CN201921160166.4U CN201921160166U CN210487692U CN 210487692 U CN210487692 U CN 210487692U CN 201921160166 U CN201921160166 U CN 201921160166U CN 210487692 U CN210487692 U CN 210487692U
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Abstract
The utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system belongs to the environmental monitoring equipment field. The device comprises a sampling device, a gas sampling device and a gas sampling device, wherein the sampling device is used for collecting sample gas in a pollution source flue; the chromatographic analyzer is used for analyzing and monitoring the VOC component change in the sample gas, a sample gas inlet and a sample gas outlet are arranged on the chromatographic analyzer, the sample gas inlet is communicated with the sampling device through a pipeline, and the sample gas outlet is communicated with the tail gas exhaust pipe; the gas source unit comprises a zero gas generator, a hydrogen gas generator and a nitrogen gas generator which are respectively communicated with the chromatographic analyzer through pipelines; the heating chamber is arranged on a pipe section close to the chromatographic analyzer on a connecting pipeline of the sampling device and the chromatographic analyzer, and the pipe section is arranged in the heating chamber; and the air pump is arranged on the tail gas exhaust pipe. The utility model discloses a locate tail gas calandria pipeline section with the aspiration pump, sample gas entry anterior segment is located to the heating chamber, optimizes the operating mode environment of aspiration pump when guaranteeing sample gas intake state stability, reduces the system fault rate greatly, improves the effective life of system.
Description
Technical Field
The utility model belongs to the environmental monitoring equipment field, more specifically say, relate to a negative pressure formula pollution sources VOC on-line monitoring system.
Background
Volatile Organic Compounds (VOCs) are Organic Compounds having a saturated vapor pressure of more than 133.32Pa at normal temperature and a boiling point of 50 to 260 ℃ or less at normal pressure, or Organic solids or liquids that are Volatile at normal temperature and normal pressure. VOCs are the most common pollutants discharged by petrochemical, pharmaceutical, printing, shoe making, paint spraying and other industries. These are mainly hydrogen sulfide, thiols, ammonia, amines, nitro compounds, hydrocarbons, fatty acids, alcohols, phenols, esters, organic halogen derivatives, and the like. Most of these organic substances are toxic, and some of them have been classified as carcinogens, such as vinyl chloride, benzene, polycyclic aromatic hydrocarbons, etc. Most VOCs are flammable and explosive, and threaten the safety of production enterprises; some VOCs have a damaging effect on the ozone layer, such as chlorofluorocarbons (CFCls) and Hydrochlorofluorocarbons (HCFCs). VOCs are the main pollution sources for generating ozone pollution and photochemical pollution, and the environmental protection department has listed the VOCs as the greatest air pollution in addition to fine particulate matters, and the VOCs are also one of the important precursors for causing dust-haze weather. Volatile organic compounds can directly cause harm to human bodies and can indirectly participate in photochemical reactions to generate secondary pollutants, and the volatile organic compounds are one of the main sources for forming PM.. Therefore, VOCs, particulate matters, sulfur dioxide and nitrogen oxides are listed as equally important atmospheric pollutants in China, and related emission standards, estimation methods and other systems are perfected in China and places, so that the total emission amount is reduced comprehensively, and the atmospheric environment is improved. Therefore, the concentration monitoring of volatile organic compounds in the flue of the pollution source and the air of the park is also a serious problem.
The existing pollution source on-line monitoring system is characterized in that an air suction pump is arranged on a pipe section in front of a sample gas inlet of a chromatographic analyzer, and a heating device is arranged at the position of the air suction pump, so that the air suction pump is in a high-temperature and high-corrosion environment for a long time and is prone to failure, and the air suction pump is troublesome to disassemble and assemble after failure, and influences the use of the monitoring system.
Through retrieval, the Chinese patent publication number: CN107051102A, published: 2017, 8 and 18 months, discloses a VOC on-line monitoring system and a treatment system, the application comprises a sample gas compressor, a catalytic combustion furnace, a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve, two first chromatographic columns, two second chromatographic columns, a plurality of heaters, a desorption gas compressor, a VOC on-line monitor and a tail gas discharge pipe, wherein the input end of the sample gas compressor is connected with a sample gas supply pipe, the output end of the sample gas compressor is respectively connected with the VOC on-line monitor and the front port of the second three-way valve, the output end of the catalytic combustion furnace is respectively connected with the upper port of the first three-way valve and the lower port of the third three-way valve, the lower port of the first three-way valve is connected with the upper port of the second three-way valve, compared with the prior art, the system, but the gas composition that awaits measuring in the pollution sources is complicated, and debris influence factor in the gas that awaits measuring that the system of this application got into the chromatograph is big, can cause the influence to the monitoring result, and this system structure is complicated, and later stage is overhauld troublesome.
SUMMERY OF THE UTILITY MODEL
1. Problems to be solved
To the problem that current pollution sources on-line monitoring system easily breaks down and influences life, the utility model provides a negative pressure formula pollution sources VOC on-line monitoring system through locating tail gas calandria pipeline section with the aspiration pump, and sample gas entry anterior segment is located to the heating chamber, when guaranteeing that sample gas air inlet state is stable, has optimized the operating mode environment of aspiration pump, has reduced the fault rate of this system greatly, has improved system effective life.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
A negative pressure type pollution source VOC on-line monitoring system comprises,
the sampling device is internally provided with a sampling probe and is used for collecting sample gas in a pollution source flue;
the device comprises a chromatographic analyzer, a tail gas exhaust pipe and a tail gas exhaust pipe, wherein the chromatographic analyzer is used for analyzing and monitoring the VOC component change in the sample gas, and is provided with a sample gas inlet and a sample gas outlet;
the gas source unit comprises a zero gas generator, a hydrogen gas generator and a nitrogen gas generator which are respectively communicated with the chromatographic analyzer through pipelines;
also comprises the following steps of (1) preparing,
the heating chamber is arranged on a pipe section close to the chromatographic analyzer on a connecting pipeline of the sampling device and the chromatographic analyzer, and the pipe section is arranged in the heating chamber;
and the air pump is arranged on the tail gas exhaust pipe.
The scheme is that a heating chamber is arranged at a pipe section close to the chromatographic analyzer to heat the sample gas before the sample gas is introduced into the chromatographic analyzer so as to remove moisture, an air pump is arranged on a communicating pipe between a sample gas outlet and a tail gas outlet, the input port of the air pump is close to the sample gas outlet, when the air pump is started, negative pressure is formed in front of the input port, the sample gas collected by a sampling device can be continuously extracted by the balance pressure at the sample gas inlet of the chromatographic analyzer, so that sample gas input with stable air pressure is provided for the chromatographic analyzer, meanwhile, the heating chamber arranged at the front section of the sample gas inlet enables the input sample gas to have stable temperature, so that the stability of air flow entering of the chromatographic analyzer is ensured, the detection accuracy and the service life of the chromatographic analyzer are improved, the air pump does not need to bear high temperature, and the gas discharged from the sample gas outlet has no high corrosivity, therefore, the failure rate of the online monitoring system is reduced on the whole, and the service life of the online monitoring system is prolonged.
Furthermore, the device also comprises a heat tracing pipe which is a heating pipe wrapped outside the pipeline and is arranged on the pipeline section which is close to the sampling device on the connection pipeline of the sampling device and the chromatographic analyzer. Be equipped with the heat tracing pipe in sampling device and chromatographic analyzer connecting pipeline near sampling device's pipeline department, when the gas of gathering through the pollution source passes through connecting pipeline, be heated by the heat tracing pipe once earlier, the sample gas continues to flow along the pipeline, when the pipeline that is close to the chromatographic analyzer, by heating chamber continuous heating, whole incessant heating can thoroughly get rid of the liquid moisture in gathering the sample gas in the pollution source, in order to avoid liquid moisture to the influence of analysis test result and instrument effective life, further reduce the chromatographic analyzer fault rate.
And the device further comprises a safety bypass, one end of the safety bypass is communicated with the air extracting pump, the other end of the safety bypass is communicated with a connecting pipeline of the sampling device and the chromatographic analyzer, and a safety valve is arranged on the safety bypass. Be equipped with the relief valve on the safety bypass, the relief valve is the valve for current safety protection, be in normally closed state at ordinary times, open when pressure in the pipeline reachs a definite value, when chromatographic analyzer breaks down appearance gas inlet stifled, the aspiration pump continues work, when the atmospheric pressure of aspiration pump input port anterior segment reachs a definite pressure, trigger the relief valve, the relief valve is opened, the aspiration pump passes through the direct connecting line intercommunication with sampling device and chromatographic analyzer of safety bypass, thereby effectively avoided the aspiration pump to be suppressed the condition of dying the damage and taken place, instrument life has been prolonged.
Further, still include the atmospheric valve on the safe side road, it locates between the connecting line of relief valve and sampling device and chromatographic analyzer, the atmospheric valve is the needle valve. When this system normally worked, the needle valve prevented that there was the sample gas to reveal along safe bypass and influences the stability influence monitoring analysis result of sample gas entry sample gas pressure, and when chromatographic analyzer blockked up, the relief valve triggered and opens, and simultaneously signals made the needle valve open.
Further, still include the mark gas pitcher, its output is equipped with two branches, first branch road and chromatographic analyzer's appearance gas inlet intercommunication, second branch road and sampling device intercommunication. Be equipped with the half mark valve on the first branch road, be equipped with the full mark valve on the second branch road, set for half mark valve a week in this scheme and open once, carry out half mark correction once to the chromatographic analyzer, set for full mark valve once a month and open once, carry out full mark correction once to the instrument, effectively guarantee accuracy and save time of instrument measurement analysis result.
Further, still include air compressor machine and gas holder, the air compressor machine output with the gas holder input passes through the pipeline intercommunication, a gas holder output and zero gas generator input intercommunication. The air compressor is an existing device, air is compressed and then conveyed to the air storage tank, the air storage tank has a buffering effect on the air transmitted by the air compressor, so that the air output by the air storage tank is stable airflow, the air storage tank is communicated with the input end of the zero gas generator and provides a gas source for the zero gas generator, organic matters and other impurity gases influencing an analysis result are removed from the air in the zero gas generator, and finally auxiliary gas input into the chromatographic analyzer does not contain influencing gas.
Furthermore, an oil-water separator is arranged on a connecting pipeline between the air compressor and the air storage tank, and a pressure reducing valve is arranged on the oil-water separator. The oil-water separator is provided with the pressure reducing valve, so that the pressure of the output gas of the air compressor can be reduced, impurities such as condensed moisture and oil in the compressed air can be separated, the compressed air is preliminarily purified, the gas in the gas storage tank and the gas subsequently input into other pipelines are ensured not to contain impurities such as moisture and oil, and the influence on the detection result is avoided.
Further, the output of gas holder is all the way through a port that the pipeline inserted the three-way valve, the pipeline that sampling device and chromatographic analysis are connected divide into two parts, switch-on with two other ports of three-way valve respectively, be equipped with the pneumatic valve on the pipeline between three-way valve and the appearance gas entry, be in normally open state, pneumatic valve one end and three-way valve switch-on, be equipped with the cross valve on the pipeline of the other end and the sample entry switch-on, the one end switch-on pneumatic valve of cross valve, the appearance gas entry is put through to one end, the first branch of one end switch-on mark gas.
Furthermore, an output end of the gas storage tank is communicated with the sampling device through a pipeline, and a back flushing valve is arranged on the pipeline. The pipeline that the output of this scheme gas holder was taken over is equipped with the blowback valve, is in normally closed state, regularly opens the blowback valve and carries out the blowback along gas holder to three-way valve to sampling device's pipeline, and is clear with the impurity thing in the filter, prevents that the sample gas after the sampling device output from blockking up the detection that influences the instrument in the filter.
Furthermore, an output end of the gas storage tank is communicated with a sample gas inlet of the chromatographic analyzer through a pipeline, and a driving gas valve is arranged on the pipeline. An output of gas holder passes through the tube coupling to the pneumatic valve, the drive pneumatic valve is in the normally closed state, when needs carry out the semi-calibration, the drive pneumatic valve is opened, compressed gas in the gas holder flows the pneumatic valve through the pipeline and makes the pneumatic valve closed, thereby, the mark gas in the mark gas pitcher passes through first branch road, through the cross valve, enter into the chromatographic analyzer through appearance gas inlet, the pneumatic valve is the closed state this moment, the atmospheric valve is in the normally closed state, the mark gas can not enter into other pipelines.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system, the heating chamber of locating sample gas entry anterior segment makes the sample gas of input have stable temperature, the aspiration pump is located sample gas export and tail gas row mouth communicating pipe way, form the negative pressure in aspiration pump input port the place ahead, thereby provide the sample gas input of stable atmospheric pressure for the chromatographic analyzer, on the one hand, make the chromatographic analyzer have stable air inlet state, reduce chromatographic analyzer fault rate, improve the detection analysis result, on the other hand the operating mode environment of aspiration pump improves greatly, need not to bear high temperature high corrosivity, the fault rate of aspiration pump greatly reduced and cost reduction, the life of this monitoring system has improved on the whole;
(2) the utility model discloses a negative pressure formula pollution source VOC on-line monitoring system, through set up heat tracing pipe and heating chamber respectively on sampling device and chromatographic analyzer connecting pipeline, realize carrying out incessant heating to the pollution source sample gas of gathering in the pipeline, the liquid moisture in the effective thorough elimination sample gas, avoided the influence of liquid moisture to measurement analysis result and instrument life, further reduced the fault rate of this system;
(3) the utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system, when chromatographic analyzer trouble appearance gas inlet department sample gas can't input, safe bypass opens, the pressure of balanced aspiration pump anterior segment, avoided the condition emergence that the aspiration pump damaged, prolonged instrument life;
(4) the utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system adds on safe bypass and establishes the needle valve, and when this system normally worked, the needle valve prevented that there is the sample gas along safe bypass to reveal the stability that influences sample gas inlet sample gas pressure influence monitoring analysis result;
(5) the utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system, through mark gas pitcher and instrument between half mark with full mark cooperation use, regularly carry out the calibration correction to the instrument, the effective error that eliminates long-term measurement and analysis and bring, further guarantee the accuracy of instrument measurement and analysis;
(6) the utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system, through the setting of three-way valve, pneumatic valve, cross valve, under the prerequisite that accomplishes the instrument normal operating, simplified the pipeline overall arrangement in the instrument, practiced thrift installation cost and installation time greatly;
(7) the utility model discloses a negative pressure formula pollution sources VOC on-line monitoring system, an output of gas holder communicates with sampling device, through regularly opening the blowback valve, makes the pipeline between gas blowback sampling device and the three-way valve in the gas holder, in time carries out the blowback cleanness to the filter, prevents the pipeline jam, further guarantees that the instrument detects smoothly;
(8) the utility model discloses a negative pressure type pollution source VOC on-line monitoring system, which drives the air valve to control the closing of the pneumatic valve so as to prevent the air in the semi-standard process from entering other bypasses;
(9) the utility model discloses simple structure, reasonable in design easily makes.
Drawings
FIG. 1 is a gas circuit diagram of the present invention;
fig. 2 is a flow chart of the internal operation of the chromatograph.
In the figure: 1. a sampling device; 100. a heat tracing pipe; 2. a chromatographic analyzer; 200. a sample gas inlet; 201. a sample gas outlet; 3. a zero gas generator; 4. a hydrogen generator; 40. an electrolytic cell; 5. a nitrogen generator; 6. a heating chamber; 7. an air pump; 8. an air compressor; 9. an oil-water separator; 10. a gas storage tank; 11. a standard gas tank; 12. a pneumatic valve; 13. a three-way valve; 14. a blowback valve; 15. A driving air valve; 16. a safety valve; 17. an atmospheric valve; 18. a four-way valve; 19. a semi-standard valve; 20. a full-scale valve; 21. a tail gas exhaust pipe; 22. a safety bypass; 23. a float flow meter.
Detailed Description
The invention will be further described with reference to specific embodiments and drawings.
Example 1
A negative pressure type pollution source VOC on-line monitoring system, as shown in figure 1, comprising,
the sampling device 1 is internally provided with a sampling probe and is used for collecting sample gas in a pollution source flue;
the chromatographic analyzer 2 is used for analyzing and monitoring the VOC component change in the sample gas, and is provided with a sample gas inlet 200 and a sample gas outlet 201, wherein the sample gas inlet 200 is communicated with the sampling device 1 through a pipeline, and the sample gas outlet 201 is communicated with the tail gas exhaust pipe 21;
the gas source unit comprises a zero gas generator 3, a hydrogen gas generator 4 and a nitrogen gas generator 5 which are respectively communicated with the chromatographic analyzer 2 through pipelines;
it is characterized by also comprising the following steps of,
a heating chamber 6 which is provided on a pipe section near the chromatographic analyzer 2 on a connection pipeline between the sampling apparatus 1 and the chromatographic analyzer 2 and which is placed in the heating chamber 6;
and an air pump 7 provided on the exhaust pipe 21.
When the existing chromatographic analyzer 2 is used for detection and analysis, dry and impurity-free sample gas needs to be introduced, a sample gas quantitative ring is arranged in the chromatographic analyzer 2, an inlet and an outlet of the sample gas quantitative ring are communicated with a sample gas inlet 200 and a sample gas outlet 201, if pressure difference exists between the inlet and the outlet of the quantitative ring, quantitative inaccuracy and repeatability precision are influenced, the service life of the chromatographic analyzer 2 can be influenced for a long time, a filter is arranged on a connecting pipe section of a sampling device 1 and the chromatographic analyzer 2, which is close to the sampling device 1, so that impurity particles can be effectively filtered, but liquid moisture can not be effectively removed, the boiling point of volatile organic matters is low, and some components can be dissolved in liquid water, therefore, the liquid moisture enters the chromatographic analyzer 2 along with the sample gas, not only influences the analysis and measurement results, but also shortens the effective service life of the chromatographic analyzer 2 for a long time, in this embodiment, a heating chamber 6 is disposed near a pipe section of the chromatograph 2 to heat the sample gas before the sample gas is introduced into the chromatograph 2 to remove liquid moisture, and since the chromatograph 2 needs to stably introduce the sample gas, an air pump 7 is usually disposed to drive the sample gas, the existing air pump 7 is usually disposed in front of a sample gas inlet 200, an electromagnetic coil portion of the existing air pump 7 is located outside the heating chamber 6, a pipeline portion of the existing air pump is located inside the heating chamber 6, the air pump 7 works in corrosive and high-temperature environments for a long time, the working condition environment is harsh, the requirement on the air pump 7 is high, the cost is increased, the air pump 7 is prone to malfunction in the environment, the disassembly, assembly and maintenance are troublesome after malfunction, and the use of the monitoring and analyzing system is affected, therefore, in this embodiment, the air pump 7 is disposed on a communication pipe between the sample gas outlet 201 and the tail gas exhaust port 21, when the air pump 7 is started, negative pressure is formed in front of the input port, the sample gas collected by the sampling device 1 can be continuously extracted by the balance pressure at the sample gas inlet 200 of the chromatographic analyzer 2, so that the sample gas with stable air pressure is provided for the chromatographic analyzer 2 to be input, meanwhile, the input sample gas has stable temperature by the heating chamber 6 arranged at the front section of the sample gas inlet 200, so that the stability of air flow entering of the chromatographic analyzer 2 is ensured, the detection accuracy and the service life of the chromatographic analyzer 2 are improved, further, when the chromatographic analyzer 2 detects, zero gas and hydrogen are introduced to ignite and burn volatile organic matters to be detected, carbon dioxide and water generated after burning are discharged from the tail gas discharge pipe 21 along with high-purity nitrogen carrier gas through the sample gas outlet 201, no high-corrosivity gas exists in the gas components flowing through the tail gas discharge pipe 21, and the temperature at the part is not higher than 70 ℃, so the working condition environment, compare in the extraction of current positive pressure type detection gas circuit aspiration pump 7 be the sample gas that awaits measuring of high temperature high corrosivity in the flue, require corrosion-resistant, high temperature resistant, ageing-resistant and leakproofness good on material and technology, aspiration pump 7 is with high costs, because the abominable fragile trouble of its service condition, the gas circuit structure fault incidence greatly reduced of this implementation to on the whole reduced on-line monitoring system's fault rate, improved its life, the cost is reduced.
Furthermore, in this embodiment, a first-stage stainless steel filter with a filtering precision of 4-5 μm is disposed in the sampling device 1, and a second-stage stainless steel filter with a filtering precision of 1-2 μm is disposed in the tube section of the heating chamber 6, so that the sample gas entering the chromatograph 2 can be ensured to be free of impurity particles by a two-stage filtering structure.
Example 2
The online monitoring system for the VOC as the negative pressure pollution source of the embodiment is further improved on the basis of the embodiment 1, and as shown in fig. 1, the online monitoring system further comprises a heat tracing pipe 100, which is a heating pipe wrapped outside the pipeline and is arranged at a pipe section, close to the sampling device 1, on the pipeline connecting the sampling device 1 and the chromatographic analyzer 2.
Be equipped with heat tracing pipe 100 in sampling device 1 and 2 connecting pipelines of chromatographic analyzer 2 on the pipeline department of the pipeline that is close to sampling device 1, when the gas of gathering through the pollution source passes through the connecting pipeline, be heated by heat tracing pipe 100 once earlier, the sample gas continues to flow along the pipeline, when the pipeline that is close to chromatographic analyzer 2, continue to heat by heating chamber 6, whole incessant heating, make sampling device 1 to the whole 140 ~ 180 ℃ of sample gas heat tracing in the pipeline of chromatographic analyzer 2, can thoroughly get rid of the liquid moisture in gathering the sample gas in the pollution source, guarantee that all volatile organic compounds and moisture all are the gaseous state, in order to avoid the influence of liquid moisture to analysis test result and instrument effective life, further reduce 2 fault rates of chromatographic analyzer.
Example 3
The negative pressure type pollution source VOC on-line monitoring system of the embodiment is further improved on the basis of the embodiment 1 or 2, and further comprises a safety bypass 22, wherein one end of the safety bypass 22 is communicated with the air suction pump 7, the other end of the safety bypass is communicated with a connecting pipeline of the sampling device 1 and the chromatographic analyzer 2, and a safety valve 16 is arranged on the safety bypass 22.
Because the air extracting pump 7 and the chromatographic analyzer 2 work continuously for 24 hours when the on-line monitoring system is started, and the chromatographic analyzer 2 is possibly blocked by impurities which are not completely filtered during analysis and detection, so that sample gas can not enter the sample gas inlet 200, at this time, the air extracting pump 7 which continues to work is easily damaged, the safety bypass 22 is arranged in the embodiment, the safety bypass 22 is provided with the safety valve 16, the safety valve 16 is an existing safety protection valve and is normally closed at ordinary times, the safety valve is opened when the pressure in the pipeline reaches a certain value, when the chromatographic analyzer 2 is in fault and the sample gas inlet 200 is blocked, the air extracting pump 7 continues to work, when the air pressure at the input port at the front section of the air extracting pump 7 reaches a certain pressure, the safety valve 16 is triggered, the safety valve 16 is opened, the air extracting pump 7 is directly communicated with the connecting pipeline of the sampling device 1 and the chromatographic analyzer 2 through, thereby effectively avoiding the condition that the air pump 7 is blocked and damaged and prolonging the service life of the instrument.
Example 4
The online monitoring system for the negative pressure type pollution source VOC of the embodiment is further improved on the basis of the embodiment 1, the embodiment 2 or the embodiment 3, the safety bypass 22 further comprises an emptying valve 17, the emptying valve 17 is arranged between the safety valve 16 and a connecting pipeline of the sampling device 1 and the chromatographic analyzer 2, and the emptying valve 17 is a needle valve.
The needle valve is the existing valve with better pressure resistance and sealing performance, the needle valve is arranged in the embodiment, when the system works normally, the needle valve prevents sample gas from leaking along the safety bypass 22 to influence the stability of the sample gas pressure at the sample gas inlet 200 to influence the monitoring and analyzing result, when the chromatographic analyzer 2 is blocked, the safety valve 16 is triggered to be opened, and meanwhile, a signal is sent to enable the needle valve to be opened.
Example 5
The negative pressure formula pollution sources VOC on-line monitoring system of this embodiment is further improved on the basis of embodiment 1 or 2 or 3 or 4, still includes mark gas pitcher 11, and its output is equipped with two branches, and first branch communicates with the sample gas entry 200 of chromatographic analyzer 2, and the second branch communicates with sampling device 1.
In the scheme, the half-mark valve 19 is arranged on the first branch, normally closed, when the sample gas is opened, the sample gas in the sample gas tank 11 enters the sample gas inlet 200 through the heating chamber 6, and the chromatographic analyzer 2 is preliminarily corrected in the process of detecting and analyzing the sample gas by the chromatographic analyzer 2, so that errors caused by long-term analysis and measurement of the sample gas of a pollution source are reduced, and the accuracy of an analysis result is improved;
in the scheme, the full-standard valve 20 is arranged on the second branch, normally closed, when the sample gas is opened, the standard gas in the standard gas tank 11 passes through the sampling device 1, the heating chamber 6 and the air pump 7, and finally enters the chromatographic analyzer 2 through the sample gas inlet 200, the standard gas completes the whole process of sample gas analysis, complete calibration and calibration are carried out on the instrument, errors generated by long-term use of the instrument are eliminated, and the accuracy of a measurement and analysis result is improved;
the full calibration correction effect is good but the time consumption is long;
further, in this embodiment, the half-standard valve 19 is set to be opened once a week, the chromatographic analyzer 2 is subjected to half-standard correction once, the full-standard valve 20 is set to be opened once a month, and the instrument is subjected to full-standard correction once, so that the accuracy of the measurement and analysis result of the instrument is effectively ensured, and the time is saved.
Example 6
The negative pressure formula pollution sources VOC on-line monitoring system of this embodiment does further improvement on the basis of embodiment 1 or 2 or 3 or 4 or 5, still includes air compressor machine 8 and gas holder 10, 8 output ends of air compressor machine with the gas holder 10 input passes through the pipeline intercommunication, 10 output ends of gas holder and the 3 input end intercommunications of zero gas generator.
The air compressor 8 is the existing device, and carry gas holder 10 after compressing the air, gas holder 10 plays the cushioning effect to the gas of air compressor 8 transmission, makes the gas of gas holder 10 output be steady air current, and the gas holder 10 of this embodiment has four ways output, and wherein A way output end is communicated with zero gas generator 3 input, provides the gas source for zero gas generator 3, and the gas is in zero gas generator 3 impurity gas such as the influence analysis result of organic matter quilt removal, does not contain in the auxiliary gas of final input chromatographic analyzer 2 and influences the gas.
Example 7
The negative pressure type pollution source VOC on-line monitoring system of this embodiment is further improved on the basis of embodiment 6, as shown in fig. 1, the air compressor 8 with be equipped with oil water separator 9 on the connecting pipeline of gas holder 10, be equipped with the relief pressure valve on the oil water separator 9.
The oil-water separator 9 is provided with a pressure reducing valve, so that the pressure of the compressed gas output by the air compressor 8 can be reduced, impurities such as condensed moisture and oil content in the compressed air can be separated, the compressed air is primarily purified, the gas in the gas storage tank 10 and the subsequent gas input into other pipelines is ensured not to contain impurities such as moisture and oil content, and the influence on the detection result is avoided.
Example 8
The negative pressure type pollution source VOC on-line monitoring system of this embodiment is further improved on the basis of any one of embodiments 1-7, as shown in FIG. 1, an output end of the gas storage tank 10 is communicated with the sampling device 1 through a pipeline, and a blowback valve 14 is arranged on the pipeline.
In this embodiment, a port of three-way valve 13 is inserted through the pipeline to the B way output end of gas holder 10, the pipeline that sampling device 1 and chromatographic analyzer 2 are connected divide into two parts, respectively with two other port switch-ons of three-way valve 13, be equipped with pneumatic valve 12 on the pipeline between three-way valve 13 and the sample gas entry 200, be in normally open state, pneumatic valve 12 one end and three-way valve 13 switch-on, be equipped with cross valve 18 on the pipeline of the other end and sample gas entry 200 switch-on, the pneumatic valve 12 of one end switch-on of cross valve 18, one end switch-on sample gas entry 200, the first branch of one end switch-on mark gas holder 11, one.
There is the filter on the sample gas output back pipeline in the sampling device 1 to filter the impurity in the sample gas, long-term use impurity thing can block up the filter, be equipped with blowback valve 14 on the B way output connection pipeline of this embodiment gas holder 10, be in normally closed state, regularly open blowback valve 14 and carry out the blowback along the B way of gas holder 10 to the pipeline of three-way valve 13 to sampling device 1, with the impurity thing in the filter clear, prevent that the sample gas after the sampling device 1 output from blockking up the detection that influences the instrument in the filter.
Example 9
The online monitoring system for the negative pressure type pollution source VOC of the embodiment is further improved on the basis of any one of the embodiments 1-8, as shown in FIG. 1, one output end of the gas storage tank 10 is communicated with the sample gas inlet 200 of the chromatographic analyzer 2 through a pipeline, and a driving gas valve 15 is arranged on the pipeline.
In this embodiment, C way output of gas holder 10 passes through pipe connection to pneumatic valve 12, drive pneumatic valve 15 is in normally closed state, when needs carry out the semi-calibration, drive pneumatic valve 15 opens, compressed gas in the gas holder 10 passes through the pipeline and flows pneumatic valve 12 and make pneumatic valve 12 closed, thereby, the mark gas in the mark gas holder 11 passes through first branch road, through cross valve 18, enter into chromatographic analyzer 2 through appearance gas inlet 200, pneumatic valve 12 is closed state this moment, atmospheric valve 17 is in normally closed state, the mark gas can not enter into other pipelines.
Further, the path D of the gas storage tank 10 is directly communicated with the chromatographic analyzer 2 through a pipeline, and driving gas is provided for the operation of the chromatographic analyzer 2.
Further, the pneumatic valve 12, the three-way valve 13, the back-flushing valve 14, the driving pneumatic valve 15, the emptying valve 17, the four-way valve 18, the semi-standard valve 19 and the full-standard valve 20 mentioned in the present application are all existing valves, and can be preset to control the opening and closing of the existing valves, wherein the pneumatic valve 12 is normally opened, and the closing of the existing valves is controlled by compressed air in the air storage tank 10C; the three-way valve 13 and the four-way valve 18 are normally open; the back flushing valve 14, the driving air valve 15, the emptying valve 17, the half mark valve 19 and the full mark valve 20 are all normally closed and are opened according to setting when needed.
The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.
Claims (8)
1. A negative pressure type pollution source VOC on-line monitoring system comprises,
the sampling device (1) is internally provided with a sampling probe and is used for collecting sample gas in a pollution source flue;
the device comprises a chromatographic analyzer (2) for analyzing and monitoring the VOC component change in sample gas, wherein a sample gas inlet (200) and a sample gas outlet (201) are arranged on the chromatographic analyzer, the sample gas inlet (200) is communicated with a sampling device (1) through a pipeline, and the sample gas outlet (201) is communicated with a tail gas exhaust pipe (21);
the gas source unit comprises a zero gas generator (3), a hydrogen gas generator (4) and a nitrogen gas generator (5) which are respectively communicated with the chromatographic analyzer (2) through pipelines;
it is characterized by also comprising the following steps of,
the heating chamber (6) is arranged on a pipe section close to the chromatographic analyzer (2) on a connecting pipeline of the sampling device (1) and the chromatographic analyzer (2), and the pipe section is arranged in the heating chamber (6);
and the air pump (7) is arranged on the tail gas exhaust pipe (21).
2. The on-line monitoring system for VOC (volatile organic compounds) in negative pressure pollution sources of claim 1, wherein: the device is characterized by further comprising a heat tracing pipe (100), wherein the heat tracing pipe is a heating pipe wrapped outside the pipeline and is arranged at a pipe section, close to the sampling device (1), on a connecting pipeline of the sampling device (1) and the chromatographic analyzer (2).
3. The on-line monitoring system for VOC (volatile organic Compounds) as a negative pressure pollution source according to any one of claims 1 or 2, characterized in that: the device is characterized by further comprising a safety bypass (22), wherein one end of the safety bypass is communicated with the air pump (7), the other end of the safety bypass is communicated with a connecting pipeline of the sampling device (1) and the chromatographic analyzer (2), and a safety valve (16) is arranged on the safety bypass (22).
4. The on-line monitoring system for VOC (volatile organic Compounds) in negative pressure pollution sources of claim 3, wherein: still include atmospheric valve (17) on safe bypass (22), it is located between the connecting line of relief valve (16) and sampling device (1) and chromatographic analyzer (2), atmospheric valve (17) are the needle valve.
5. The on-line monitoring system for VOC (volatile organic compounds) in negative pressure pollution sources of claim 1, wherein: still include mark gas pitcher (11), its output is equipped with two branches, and first branch road and chromatographic analyzer (2) sample gas entry (200) intercommunication, second branch road and sampling device (1) intercommunication.
6. The on-line monitoring system for VOC (volatile organic compounds) in negative pressure pollution sources of claim 1, wherein: still include air compressor machine (8) and gas holder (10), air compressor machine (8) output with gas holder (10) input passes through the pipeline intercommunication, a gas holder (10) output and zero gas generator (3) input intercommunication.
7. The on-line monitoring system for VOC (volatile organic Compounds) in negative pressure pollution sources of claim 6, wherein: an oil-water separator (9) is arranged on a connecting pipeline between the air compressor (8) and the air storage tank (10), and a pressure reducing valve is arranged on the oil-water separator (9).
8. The on-line monitoring system for VOC (volatile organic Compounds) in negative pressure pollution sources of claim 7, wherein: one output end of the gas storage tank (10) is communicated with the sampling device (1) through a pipeline, and a back flushing valve (14) is arranged on the pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114594217A (en) * | 2022-03-30 | 2022-06-07 | 南京分析仪器厂有限公司 | Calibration method of chemical waste gas monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114594217A (en) * | 2022-03-30 | 2022-06-07 | 南京分析仪器厂有限公司 | Calibration method of chemical waste gas monitoring system |
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