CN107219086B - Test platform and test method for evaluating performance of organic waste gas treatment device based on gas path automatic control - Google Patents
Test platform and test method for evaluating performance of organic waste gas treatment device based on gas path automatic control Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
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Abstract
The application discloses a test platform for evaluating the performance of an organic waste gas treatment device based on automatic control of a gas circuit and a test method thereof. The evaluation system integrates the functions of accurate control of gas flow, automatic control of a multi-directional gas circuit, temperature, time control and gas analysis and detection, has the advantages of multiple control functions, high precision, excellent safety performance, convenient operation, low investment and operation cost and the like, and solves the problems of limited control precision, low safety level and the like of the traditional gas circuit system. In general, the test platform provided by the application has the advantages of high control precision, low economic cost and the like, can meet the test and evaluation requirements of the organic waste gas treatment device, and meets the related requirements of VOCs control in the domestic main industry; the device to be tested can be evaluated in a larger concentration range of VOCs, and the performance test requirements of various types of organic waste gas treatment devices can be met.
Description
Technical Field
The application relates to the field of environmental pollution treatment equipment, in particular to a test platform for evaluating the performance of an organic waste gas treatment device based on automatic control of a gas circuit and a test method thereof.
Background
VOCs, according to WHO definition, refer to organic liquids and solids having a vapor pressure greater than 70.91Pa at room temperature and a boiling point in air below 260 ℃. The compounds have higher reactivity, play a very important role in the atmospheric chemical process, can participate in atmospheric photochemical reaction and further cause pollution such as photochemical smog, and generally have stronger irritation and toxicity. The waste gas has the characteristics of large emission, complex components, difficult treatment, strong toxicity and the like. The sources are mainly as follows: volatile organic solvents in petrochemical industry, paint decoration, printing industry, electronic manufacturing, surface corrosion prevention, shoemaking, transportation and other industries. And the exhaust gases produced by the industries also have detail differences.
In the research and development of novel efficient air pollution tail end treatment purification technology, the research of technologies such as adsorption/absorption, catalytic oxidation, regenerative combustion, biodegradation, plasma catalysis, enhanced absorption, multiple recovery/purification and the like have been widely carried out at home and abroad. In developed countries (regions) such as japan, europe, north america, etc., the related technologies such as catalytic oxidation and biodegradation have become the mainstream technology for purifying exhaust gas pollution of VOCs in recent years while strengthening and improving the conventional methods such as absorption and adsorption. Scientists in China also begin to pay attention to research and development of single or coupling purification technologies such as catalytic oxidation and biodegradation, and attempt to improve the whole level of industries of waste gas recovery/purification in China through traditional technologies such as process strengthening and absorption improvement.
Therefore, aiming at different organic industrial waste gases and the characteristics of the organic industrial waste gases, how to evaluate the prior art, matching proper treatment technologies and reactors for the different organic industrial waste gases, and even developing and integrating novel organic industrial waste gas treatment technologies and devices aiming at the advantages of the prior various technologies, the realization of standard emission of tail gas becomes an important research direction of waste gas treatment and key in the current practical engineering application.
At present, the organic waste gas treatment device which is actually applied firstly needs to examine the VOCs degradation efficiency in a laboratory by simulating organic waste gas in a certain industry, and the industrial scale-up is realized after the system performance is evaluated through analysis, detection and improvement. At present, laboratory performance evaluation of organic waste gas treatment devices has the following disadvantages: (1) The automation degree of the platform operation is low, and the problems of large error, complex operation and the like exist for accurately controlling the flow of the mixed gas source; (2) The organic waste gas has toxicity, and has great potential safety hazard to test personnel and laboratories when the analysis operation is carried out; (3) The exhaust pollution factor monitoring and data analysis cannot be fed back in real time.
Therefore, the development and design of the test platform for evaluating the performance of the organic waste gas treatment device, which has high automation degree, can accurately control the flow of the air source, is safe and is simple and convenient to operate, and the test method thereof have important practical significance.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides a test platform and a test method for evaluating the performance of an organic waste gas treatment device, which are based on automatic control of a gas path, safe and simple and convenient to operate.
The purpose of the application is realized in the following way:
the test platform based on the automatic control of the gas circuit for evaluating the performance of the organic waste gas treatment device comprises a gas generation unit, a gas circuit control unit connected with the gas generation unit, an analysis monitoring unit connected with the gas circuit control unit, an auxiliary unit connected with the analysis detection unit and a liquid circuit circulation unit;
the gas generating unit comprises an external gas source device (3) and a nitrogen generator (1); the external air source device (3) is connected with an air path control cabinet (10) in the air path control unit through a pipeline provided with an air source control valve (2); the external gas source device (3) is used for providing the gas required by the test platform, mainly comprising a nitrogen generator, a gas steel cylinder and the like, and can provide oxygen (O) 2 ) Nitrogen (N) 2 ) Carbon dioxide (CO) 2 ) Organic gas sources such as argon (Ar) and dimethylbenzene, ethyl acetate and the like; the air valve control switch (2) controls the opening or closing of the gas generating pipeline;
the gas circuit control unit comprises a gas circuit control cabinet (10), wherein the gas circuit control cabinet (10) comprises a gas mass flowmeter (4), the gas mass flowmeter (4) is connected with a gas mixing chamber (5) through a pipeline, and the gas mixing chamber (5) is connected with a solenoid valve combination unit (9) controlled by a PLC (8);
the saidThe gas mass flowmeter (4) comprises a mass flowmeter and a data display instrument, can accurately control the gas flow rate of the input platform, and monitors the gas mass flow rate by adopting a capillary heat transfer temperature difference calorimeter principle; the mass flowmeter can be connected with 5 different gas pipelines simultaneously to detect O respectively 2 、N 2 、CO 2、 Ar and organic gases have five different gas flows, and the controlled gas flows are respectively as follows: o (O) 2 100 mL/min; n (N) 2 2.00L/min; CO 2 200 mL/min; ar is 1.00L/min; the organic gas is 500 mL/min; the data display comprises an LED display screen and a gas flow adjusting knob. The gas flow adjusting knob can adjust the gas flow; the data display instrument accurately displays 5 paths of different gas flow simultaneously; the data display instrument is directly connected with the PC end by adopting a circuit and is controlled by data recording software to record gas flow data at different time points in real time; the gas mixing chamber (5) is made of stainless steel materials, so that different gases are fully mixed; the electromagnetic valve combination unit (9) controlled by the PLC (8) adopts four electromagnetic valve combinations and four groups of gas circuit switches to control the gas flow direction, the four groups of gas circuit switches are connected with the PLC (8), the operation of the electromagnetic valves is controlled by adjusting the output signals of the PLC (8) to act on the gas circuit switches, and the first electromagnetic valve controls the emptying of the mixed gas source; the second electromagnetic valve controls the mixed gas source to enter the gas chromatographic analyzer (13); the third electromagnetic valve controls the mixed gas to enter the reactor I (16); a fourth electromagnetic valve controls the mixed gas to enter a reactor II (20); a first ball valve (14) is arranged on a pipeline of the electromagnetic valve connecting reactor II (20) in the electromagnetic valve combination unit (9); the reactor I (16) is connected with a pipeline of the electromagnetic valve in the electromagnetic valve combination unit (9) and is provided with a second ball valve (15).
The analysis and detection unit comprises a gas chromatograph (13) and a data record analysis terminal PC (12); the gas chromatograph (13) includes: the system comprises a six-way sample injection valve, a separation column, a temperature control system, a detector and a data recording and analyzing platform; when the simulated waste gas is discharged from the reactor I (16) and the reactor II (20), the simulated waste gas is separated by a separation column through a solenoid valve (9) controlled by a PLC (8), and the detector records detection data in real time so as to evaluate the effect of the organic waste gas treatment device;
the auxiliary unit comprises a digital time controller (11) controlled by a PLC (8), an intelligent digital temperature controller (17), a pressure drop sensor (6) and an alarm (7); the components in the auxiliary system are all connected with the PLC (8) through lines, and relevant data are recorded in real time and can be displayed on a data analysis terminal PC (12);
the digital time controller (11) is connected with the PLC (8) and controls the flow direction of a gas pipeline in the platform; the intelligent digital temperature controller (17) is used for controlling the temperature of the water bath (19) to be in a set range and insulating the organic waste gas reactor to be evaluated; the pressure drop sensors (6) are arranged at the tail gas pipeline interfaces above and below the organic waste gas treatment device reactor II (20) to be evaluated and above the reactor I (16) and are used for monitoring the total resistance in the organic waste gas treatment device reactor II (20) to be evaluated and the total resistance in the reactor I (16); the alarm (7) is connected with the PLC (8) through a circuit, the pressure drop and the temperature in the circuit exceed the set range, the pressure drop is fed back to the PLC (8) through the intelligent digital temperature controller (17) and the pressure drop sensor (6) so as to be output and act on the alarm (7), and the alarm (7) alarms in time;
the liquid path circulation unit comprises a liquid storage tank (21) positioned in a water bath tank (19) and a miniature direct-current water pump (18) connected with the liquid storage tank (21), and the miniature direct-current water pump (18) is connected with a reactor II (20) through a pipeline provided with a rotameter (22); the maximum lift of the miniature direct current water pump (18) is 3.6-7.2 m, and the maximum flow is 8 m 3 /h; the flow range of the rotameter (22) is 0-100L/h;
the test method of the test platform for evaluating the performance of the organic waste gas treatment device based on the automatic control of the gas circuit comprises the following steps:
a. according to the requirements of a reactor I (16) or a reactor II (20) to be evaluated, different external air source devices (3) are disassembled and installed, and different types and concentrations of target pollutants are configured, so that the simulated industrial waste gas containing different VOCs substances can be simulated and generated;
b. the liquid storage tank (21) is provided with silicon oil absorption liquid with different concentrations by using a dosing pump (23);
c. the silicone oil-containing absorption liquid prepared in the step b is conveyed into a reactor II (20) to be evaluated through a circulating liquid pipeline to react with organic waste gas, the reacted circulating liquid flows out to a liquid storage tank (21) through a pipeline at the bottom of the reactor II (20), the reacted circulating liquid returns to the reactor II (20) to be evaluated through a miniature direct-current water pump (18) and a rotameter (22) to absorb VOCs in simulated waste gas, and a dosing pump (23) is arranged above the side of the liquid storage tank (21);
d. a liquid storage tank (21) in the liquid path circulation unit adopts a materialization process comprising gravity precipitation, receives and purifies partial absorption liquid generated after the reactor II (20) to be evaluated absorbs organic waste, and removes solid impurities in the absorption liquid;
e. opening a gas mass flowmeter (4) to accurately control the flow of a gas source; opening a supply gas source, and enabling the gas to enter a mass flow rate (control) meter (4) through a pipeline; the gas enters a gas mixing chamber (5) for mixing after passing through a mass flowmeter (4), the mixed gas enters an electromagnetic valve gas circuit controller (9), a gas circuit control unit is regulated by a PLC (8), and the mixed gas is automatically controlled to enter different module units, namely a reactor, an analysis detector or evacuation; the analysis and detection system monitors the mixed gas or the treated waste gas on line in real time;
the temperature condition of the circulating absorption liquid prepared in the liquid path circulating unit is 30-35 ℃; the circulating absorption liquid conveyed in the circulating liquid pipeline is silicone oil with the concentration of 0.5-1 mmol/L, and the pH value of the circulating absorption liquid is controlled to be 6.8-7.1; the liquid-gas ratio in the reactor II (20) to be evaluated is not more than 5:1; the VOCs concentration in the simulated industrial waste gas is not more than 2000 mg/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The pressure drop in the reactor II (20) to be evaluated is not more than 3200 and Pa; the maximum air volume of the organic waste gas treatment device tested on the platform is 300L/h, and the maximum liquid flow is 80 m 3 /h。
Has the positive beneficial effects that: the evaluation system integrates the functions of accurate control of gas flow, automatic control of a multi-directional gas circuit, temperature control, time control and gas analysis and detection, has the advantages of multiple control functions, high precision, excellent safety performance, convenient operation, low investment and operation cost and the like, and solves the problems of limited control precision, low safety level and the like of the traditional gas circuit system. In general, the test platform provided by the application has the advantages of high control precision, low economic cost and the like, can meet the test and evaluation requirements of the organic waste gas treatment device, and meets the related requirements of VOCs control in the domestic main industry; the device to be tested can be evaluated in a larger concentration range of VOCs, and the performance test requirements of various types of organic waste gas treatment devices can be met.
Drawings
FIG. 1 is a schematic diagram of a test platform according to the present application;
the figure is: the nitrogen generator 1, the gas source control valve 2, the external gas source device 3, the gas mass flowmeter 4, the gas mixing chamber 5, the pressure drop sensor 6, the alarm 7, the PLC8, the electromagnetic valve combination unit 9, the gas circuit control cabinet 10, the digital time controller 11, the data analysis terminal PC12, the gas chromatograph 13, the ball valve 14, the ball valve 15, the reactor I16, the intelligent digital temperature controller 17, the miniature direct-current water pump 18, the water bath 19, the reactor II 20, the liquid storage tank 21 and the rotor flowmeter 22.
Description of the embodiments
The application is further described below with reference to the accompanying drawings:
a test platform for evaluating the performance of an organic waste gas treatment device based on gas circuit automatic control comprises a gas generation unit, a gas circuit control unit connected with the gas generation unit, an analysis monitoring unit and an auxiliary unit connected with the gas circuit control unit, and a liquid circuit circulation unit;
the gas generating unit comprises an external gas source device (3) and a nitrogen generator (1); the external air source device (3) is connected with an air path control cabinet (10) in the air path control unit through a pipeline provided with an air valve control switch (2); the external gas source device (3) is used for providing the gas required by the test platform, mainly comprising a nitrogen generator, a gas steel cylinder and the like, and can provide oxygen (O) 2 ) Nitrogen gas（N 2 ) Carbon dioxide (CO) 2 ) Organic gas sources such as argon (Ar) and dimethylbenzene, ethyl acetate and the like; the air valve control switch (2) controls the opening or closing of the gas generating pipeline;
the gas circuit control unit comprises a gas circuit control cabinet (10), wherein the gas circuit control cabinet (10) comprises a gas mass flowmeter (4), the gas mass flowmeter (4) is connected with a gas mixing chamber (5) through a pipeline, and the gas mixing chamber (5) is connected with a solenoid valve combination unit (9) controlled by a PLC (8);
the gas mass flowmeter (4) comprises a mass flowmeter and a data display instrument, can accurately control the gas flow entering the platform, and monitors the gas mass flow by adopting a capillary heat transfer temperature difference calorimeter principle; the mass flowmeter can be connected with 5 different gas pipelines simultaneously to detect O respectively 2 、N 2 、CO 2、 Ar and organic gases have five different gas flows, and the flow rates of the controlled gases are respectively as follows: o (O) 2 100 mL/min; n (N) 2 2.00L/min; CO 2 200 mL/min; ar is 1.00L/min; the organic gas is 500 mL/min; the data display comprises an LED display screen and a gas flow adjusting knob. The gas flow adjusting knob can adjust the gas flow; the data display instrument accurately displays the flow of 5 different gases at the same time; the data display instrument is directly connected with the PC end by adopting a circuit and is controlled by data recording software to record the gas flow data at different time points in real time; the gas mixing chamber (5) is made of stainless steel materials, so that different gases are fully mixed; the electromagnetic valve combination unit (9) controlled by the PLC (8) adopts four electromagnetic valve combinations and four groups of gas circuit switches to control the gas flow direction, the four groups of gas circuit switches are connected with the PLC (8), the operation of the electromagnetic valves is controlled by adjusting the output signals of the PLC (8) to act on the gas circuit switches, and the first electromagnetic valve controls the emptying of the mixed gas source; the second electromagnetic valve controls the mixed gas source to enter the gas chromatographic analyzer (13); the third electromagnetic valve controls the mixed gas to enter the reactor I (16); a fourth electromagnetic valve controls the mixed gas to enter a reactor II (20);
the analysis and detection unit comprises a gas chromatograph (13) and a data record analysis terminal PC (12); the gas chromatograph (13) includes: the system comprises a six-way sample injection valve, a separation column, a temperature control system, a detector and a data recording and analyzing platform; when the simulated waste gas is discharged from the reactor I (16) and the reactor II (20), the simulated waste gas is separated by a separation column through a solenoid valve (9) controlled by a PLC (8), and the detector records detection data in real time so as to evaluate the effect of the organic waste gas treatment device;
the auxiliary unit comprises a digital time controller (11) controlled by a PLC (8), an intelligent digital temperature controller (17), a pressure drop sensor (6) and an alarm (7); the components in the auxiliary system are all connected with the PLC (8) through lines, and relevant data are recorded in real time and can be displayed on a data analysis terminal PC (12);
the digital time controller (11) is connected with the PLC (8) and controls the flow direction of a gas pipeline in the platform; the intelligent digital temperature controller (17) is used for controlling the temperature of the water bath (19) to be in a set range and insulating the organic waste gas reactor to be evaluated; the pressure drop sensors (6) are arranged at the tail gas pipeline interfaces above and below the organic waste gas treatment device II (20) to be evaluated and are used for monitoring the total resistance in the organic waste gas treatment device II (20) to be evaluated; the alarm (7) is connected with the PLC (8) through a circuit, the pressure drop and the temperature in the circuit exceed the set range, the pressure drop is fed back to the PLC (8) through the intelligent digital temperature controller (17) and the pressure drop sensor (6) so as to be output and act on the alarm (7), and the alarm (7) alarms in time;
the liquid path circulation unit comprises a liquid storage tank (21) positioned in a water bath tank (19) and a miniature direct-current water pump (18) connected with the liquid storage tank (21), and the miniature direct-current water pump (18) is connected with a reactor II (20) through a pipeline provided with a rotameter (22); the maximum lift of the miniature direct current water pump (18) is 3.6-7.2 m, and the maximum flow is 8 m 3 /h; the flow range of the rotameter (22) is 0-100L/h;
a test platform for evaluating the performance of an organic waste gas treatment device based on gas path automatic control comprises the following steps:
a. and opening the main power switch, and starting the gas circuit generating unit and the gas circuit control unit. Turning on a gas mass flowmeter (4), turning on a nitrogen generator and selectively turning on an oxygen-containing gas generator 2 、N 2 、CO 2、 Ar and organic gas respectively enter a mass flowmeter (4) through a gas path pipeline, and the flow of each gas is accurately controlled.
b. Adding silicone oil to prepare organic waste gas absorption liquid, and starting a liquid path circulation unit.
c. The gas enters a gas mixing chamber (5) for mixing after passing through a gas mass flowmeter (4). The mixed gas enters a solenoid valve gas circuit controller (9), a gas circuit control unit is regulated by a PLC (8), and the mixed gas is automatically controlled to enter different module units, namely a reactor, an analysis detector or evacuation; the analysis and detection system monitors the mixed gas or the treated waste gas on line in real time;
d. the analysis monitoring unit and the auxiliary unit are started. The operation digital time controller (11), the intelligent digital temperature controller (17), the pressure drop sensor (6) and the alarm (7), the monitoring platform operates stably and safely, and the gas chromatograph (13) and the data recording analysis terminal PC (12) are started. The mixed gas or the gas processed by the reactor enters a gas chromatograph (13) through a gas pipeline for online analysis, and the detection data are recorded and analyzed through a data recording and analyzing terminal PC (12) so as to evaluate the performance of the waste gas treatment device.
The main reactions in the organic waste gas treatment device to be evaluated are:
the pH value of the liquid circulating liquid is regulated to be 6.8-7.1.
And b, stopping the operation of the step b when the organic waste gas treatment device to be evaluated is a dry reactor such as a catalyst.
The reaction temperature of the step c in the liquid path domestication unit is 30-35 ℃.
The designed liquid-gas ratio range of the organic waste gas treatment device to be evaluated should be between 2:1 and 7:1.
The simulated organic waste gas concentration generated by the test platform is 0-2000 mg/Nm 3 。
The flow resistance of the organic waste gas treatment device to be evaluated should not exceed 3200 and Pa.
e. The gas generation unit simulates organic waste gas to be introduced into the organic waste gas treatment device to be evaluated through a gas circuit control cabinet (10) by a pipeline, the organic waste gas to be purified fully contacts with circulating liquid in the organic waste gas treatment device to be evaluated, and the purified waste gas is discharged from the top of the organic waste gas treatment device to be evaluated.
1. Design and manufacture of air path control unit
The design gas circuit control cabinet (10) is 1800-mm high, 1000-mm long and 1000-mm wide and is made of stainless steel. The cabinet body is divided into 4 layers, a first layer of gas mass flowmeter (4) display instrument is arranged from top to bottom, a second layer of gas mass flowmeter (4) is connected with a gas mixing chamber (5) through a pipeline, the gas mixing chamber (5) is made of cylindrical stainless steel, a plurality of layers of baffle plates are arranged inside the gas mixing chamber, the height of the baffle plates is 300 mm, and the sectional area of the baffle plates is 700 mm 2 The gas mixing chamber (5) is connected with an electromagnetic valve combination unit (9) controlled by the PLC (8), and four groups of electromagnetic valves are arranged in a straight line and are connected with a switch on a panel of the control cabinet; the PLC (8) is protected by a waterproof cover and ensures heat dissipation, and is connected with an electromagnetic valve gas circuit controller (9), a digital time controller (11), an intelligent digital temperature controller (17), a pressure drop sensor (6) and an alarm (7); a 3 rd layer miniature direct current water pump (18) and a rotameter (22); layer 4 gas chromatograph (13).
2. Installation and debugging of organic waste gas treatment device to be evaluated
(a) The organic waste gas treatment device to be evaluated is arranged on a test bracket and is fixed;
(b) The monitoring equipment such as a related pressure drop sensor (6) probe, an intelligent digital temperature controller (17) probe and the like are connected;
(c) The tightness test is carried out, and the air leakage condition of the organic waste gas treatment device to be evaluated is checked in a wider operation parameter range;
(d) And (3) debugging relevant changes in the organic waste gas treatment device to be evaluated to enable the organic waste gas treatment device to reach optimal working conditions.
3. Preparation of circulating liquid
After the device is built, a certain amount of silicone oil is added into a liquid storage tank (21) through a metering pump, and the absorption liquid in the silicone oil is prepared into circulating absorption liquid with the pH value of 6.8-7.1.
4. And (5) dynamic tail gas purification treatment.
Adding a certain amount of silicone oil into the liquid storage tank 0.3 m 3 Preparing an absorption liquid in water, and regulating the pH value of the absorption liquid to 7.0. Starting a liquid circulation pump, and under the condition that the reactor is at normal temperature, the concentration of the liquid is 1000 mg/Nm 3 The xylene simulated waste gas is introduced into the organic waste gas treatment device to be evaluated, the volume flow ratio of the simulated organic waste gas to the absorption liquid is 3, the operation is 8 h, and the purified waste gas is detected and discharged, so that the result is that: the xylene removal efficiency was 66.4%.
Adding a certain amount of silicone oil into the liquid storage tank 0.3 m 3 Preparing an absorption liquid in water, and regulating the pH value of the absorption liquid to 7.0. Starting a liquid circulation pump, and maintaining the concentration of 900 mg/Nm at normal temperature 3 、1000 mg/Nm 3 The simulated waste gas of ethyl acetate and dimethylbenzene is introduced into the organic waste gas treatment device to be evaluated, the volume flow ratio of the simulated organic waste gas to the absorption liquid is 5, the operation is 8 h, and the purified waste gas is detected and discharged, so that the result is that: the removal efficiencies of ethyl acetate and xylene were 79.2% and 64.1%, respectively.
Adding a certain amount of silicone oil into the liquid storage tank 0.3 m 3 Preparing an absorption liquid in water, and regulating the pH value of the absorption liquid to 7.0. Starting a liquid circulation pump, and under the condition that the reactor is at normal temperature, the concentration of the liquid circulation pump is 1600 mg/Nm 3 、1000 mg/Nm 3 The simulated waste gas of ethyl acetate and dimethylbenzene is introduced into the organic waste gas treatment device to be evaluated, the volume flow ratio of the simulated organic waste gas to the absorption liquid is 7, the operation is 8 h, and the purified waste gas is detected and discharged, so that the result is that: the removal efficiencies of ethyl acetate and xylene were 68.8% and 52.7%, respectively.
Closing the liquid path circulation system, and under the condition that the reactor is at normal temperature, the average temperature is 30 DEG C1500 mg/Nm 3 The ethanethiol waste gas is introduced into a to-be-detected photocatalytic reactor of the built-in catalyst module, and is operated 8 and h, and the purified waste gas is detected and discharged, so that the result is that: the removal efficiency of ethanethiol is 68.4%.
According to the testing platform for evaluating the performance of the organic waste gas treatment device based on the automatic control of the gas circuit, the gas generation unit, the gas circuit control unit, the analysis and monitoring unit, the auxiliary unit and the liquid circuit circulation unit are integrated, so that the accurate control of the concentration of an input gas source through the PLC, the accurate switching of the flow direction of the pipeline and the real-time online analysis of mixed gas are realized. In general, the evaluation system provided by the application has the advantages of multifunction, high safety performance, reduced manual operation and convenient and quick management, can meet the requirements of high-precision and safe detection of organic waste gas, and can meet the experimental requirements of various different types of reactors.
The above embodiments are only for illustrating the preferred embodiments of the present application, but the present application is not limited to the above embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application within the knowledge of those skilled in the art should be considered as the scope of the present application.
Claims (3)
1. A test platform for evaluating the performance of an organic waste gas treatment device based on gas circuit automatic control is characterized in that: the system comprises a gas generation unit, a gas circuit control unit connected with the gas generation unit, an analysis monitoring unit and an auxiliary unit connected with the gas circuit control unit, and a liquid circuit circulation unit;
the gas generating unit comprises an external gas source device (3) and a nitrogen generator (1); the external air source device (3) is connected with an air path control cabinet (10) in the air path control unit through a pipeline provided with an air source control valve (2);
the gas circuit control unit comprises a gas circuit control cabinet (10), wherein the gas circuit control cabinet (10) comprises a gas mass flowmeter (4), the gas mass flowmeter (4) is connected with a gas mixing chamber (5) through a pipeline, and the gas mixing chamber (5) is connected with a solenoid valve combination unit (9) controlled by a PLC (8);
the gas mass flowmeter (4) comprises a mass flowmeter and a data display; the mass flowmeter can be connected with 5 different gas pipelines at the same time; the data display instrument accurately displays the flow of 5 different gases simultaneously; the data display instrument is directly connected with the PC end by adopting a circuit and is controlled by data recording software to record gas flow data at different time points in real time; the gas mixing chamber (5) is made of stainless steel materials, so that different gases are fully mixed; the electromagnetic valve combination unit (9) controlled by the PLC (8) adopts four electromagnetic valve combinations and 4 groups of gas circuit switches to control the gas flow direction, the 4 groups of gas circuit switches are connected with the PLC (8), the operation of the electromagnetic valves is controlled by adjusting the output signals of the PLC to act on the gas circuit switch groups, and the first electromagnetic valve controls the emptying of the mixed gas source; the second electromagnetic valve controls the mixed gas source to enter the gas chromatographic analyzer (13); the third electromagnetic valve controls the mixed gas to enter the reactor I (16); a fourth electromagnetic valve controls the mixed gas to enter a reactor II (20);
the analysis and detection unit comprises a gas chromatograph (13) and a data record analysis terminal PC (12) connected with the gas chromatograph (13); the gas chromatograph (13) includes: the system comprises a six-way valve sample injection valve, a separation column, a temperature control system, a detector and a data recording and analyzing platform; when the simulated waste gas is discharged from the reactor I (16) and the reactor II (20), the simulated waste gas is separated by a separation column through a solenoid valve in a solenoid valve combination unit (9) controlled by a PLC, enters a detector to obtain a data signal, and is transmitted to a terminal PC to record detection data in real time so as to reflect the treatment effect of the organic waste gas treatment device to be evaluated in real time; a first ball valve (14) is arranged on a pipeline of the electromagnetic valve connecting reactor II (20) in the electromagnetic valve combination unit (9); a second ball valve (15) is arranged on a pipeline of the reactor I (16) connected with the electromagnetic valve in the electromagnetic valve combination unit (9);
the auxiliary unit comprises a digital time controller (11) controlled by a PLC (8), an intelligent digital temperature controller (17), a pressure drop sensor (6) and an alarm (7); the components in the auxiliary system are connected with the PLC (8) through lines, and relevant data are controlled and recorded in real time and can be displayed on a data analysis terminal PC (12);
the digital time controller (11) is connected with the PLC (8); the intelligent digital temperature controller (17) is used for controlling the temperature of the water bath (19) to be within a set range; the pressure drop sensor (6) is arranged at the tail gas pipeline interfaces above and below the reactor II (20) of the organic waste gas treatment device to be evaluated and above the reactor I (16); the alarm (7) is connected with the PLC (8) through a circuit, the pressure drop and the temperature in the circuit exceed the set range, the pressure drop is fed back to the PLC (8) through the intelligent digital temperature controller (17) and the pressure drop sensor (6) so as to be output and act on the alarm (7), and the alarm (7) alarms in time;
the liquid path circulation unit comprises a liquid storage tank (21) positioned in a water bath tank (19) and a miniature direct-current water pump (18) connected with the liquid storage tank (21), and the miniature direct-current water pump (18) is connected with a reactor II (20) through a pipeline provided with a rotameter (22); the maximum lift of the miniature direct current water pump (18) is 3.6-7.2 m, and the maximum flow is 8 m 3 /h; the flow range of the rotameter (22) is 0-100L/h.
2. The test method of the test platform for evaluating the performance of the organic waste gas treatment device based on gas path automatic control according to claim 1, comprising the following steps:
a. according to the requirements of a reactor I (16) or a reactor II (20) to be evaluated, different external air source devices (3) are disassembled and installed, and different types and concentrations of target pollutants are configured, so that the simulation industrial waste gas containing VOCs with different organic gas concentrations can be generated in a simulation mode;
b. the liquid storage tank (21) is provided with silicon oil absorption liquid with different concentrations by using a dosing pump (23);
c. the silicone oil-containing absorption liquid prepared in the step b is conveyed into a reactor II (20) to be evaluated through a circulating liquid pipeline to react with organic waste gas, the reacted circulating liquid flows out to a liquid storage tank (21) through a pipeline at the bottom of the reactor II (20), the reacted circulating liquid returns to the reactor II (20) to be evaluated through a miniature direct-current water pump (18) and a rotameter (22) to absorb VOCs in simulated waste gas, and a dosing pump (23) is arranged above the side of the liquid storage tank (21);
d. a liquid storage tank (21) in the liquid path circulation unit adopts a materialization process comprising gravity precipitation, receives and purifies partial absorption liquid generated after the reactor II (20) to be evaluated absorbs organic waste, and removes solid impurities in the absorption liquid;
e. opening a gas mass flowmeter (4) to accurately control the flow of a gas source; opening a supply gas source, and enabling the gas to enter a mass flowmeter (4) through a pipeline; the gas enters a gas mixing chamber (5) for mixing after passing through a mass flowmeter (4), and the mixed gas enters an electromagnetic valve gas circuit controller (9) and automatically controls the mixed gas to enter different module units, namely a reactor, an analysis detector or evacuation through a PLC (8) adjusting gas circuit control unit; and the analysis and detection system monitors the mixed gas or the treated waste gas on line in real time.
3. The test method of the test platform for evaluating the performance of the organic waste gas treatment device based on gas path automatic control according to claim 1, wherein the test method comprises the following steps: the temperature condition of the circulating absorption liquid prepared in the liquid path circulating unit is 30-35 ℃; the circulating absorption liquid conveyed in the circulating liquid pipeline is silicone oil with the concentration of 0.5-1 mmol/L, and is prepared in a liquid storage tank (21) through a dosing pump (23); the pH value of the circulating absorption liquid is controlled to be 6.8-7.1; the liquid-gas ratio in the reactor II (20) to be evaluated is not more than 5:1; the VOCs concentration in the simulated industrial waste gas is not more than 2000 mg/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The pressure drop in the reactor II (20) to be evaluated is not more than 3200 and Pa; the maximum air volume of the organic waste gas treatment device tested on the platform is 300L/h, and the maximum liquid flow is 80 m 3 /h。
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