CN111195481A - Volatile organic pollutant purification device and method - Google Patents

Volatile organic pollutant purification device and method Download PDF

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Publication number
CN111195481A
CN111195481A CN202010091282.6A CN202010091282A CN111195481A CN 111195481 A CN111195481 A CN 111195481A CN 202010091282 A CN202010091282 A CN 202010091282A CN 111195481 A CN111195481 A CN 111195481A
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oxidation catalyst
gas
casing
sensor
organic
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CN202010091282.6A
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Chinese (zh)
Inventor
陈昊
苏欣
贺晶晶
李阳阳
张鹏
耿莉敏
周志岗
丁美娟
韦昭
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Changan University
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Changan University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8678Removing components of undefined structure
    • B01D53/8687Organic components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/62Carbon oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8668Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/50Carbon oxides
    • B01D2257/502Carbon monoxide
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708Volatile organic compounds V.O.C.'s

Abstract

The invention discloses a volatile organic pollutant purification device and a method, which comprises an oxidation catalyst, an induced draft fan, a flow guide pipe and a purification regulation component, wherein the induced draft fan is started to suck external gas into the preheated oxidation catalyst, and the gas in the convection oxidation catalyst is purified through catalytic reaction at a certain temperature and under a certain pressure and then discharged out of the oxidation catalyst. The invention adsorbs oxygen in gas to be purified, and makes the oxygen fully react with organic volatile matters in the gas flowing process, thereby not only making the structure of the device more compact, but also continuously purifying the gas in the space, and having wide application range.

Description

Volatile organic pollutant purification device and method
Technical Field
The invention relates to the field of air pollution treatment, in particular to a device for converting indoor organic volatile matters such as formaldehyde, benzene and CO into harmless gas through catalytic reaction and a using method thereof.
Background
Particulate matters in automobile exhaust and industrial waste gas are important reasons for haze generation. Except for particles, CO generated by incomplete combustion is easy to combine with hemoglobin in human blood to form carboxyhemoglobin, so that the oxygen supply capability of the blood to human tissues is weakened, and when more than 0.3 percent of CO is absorbed by a human body, the human body can die in a short time; the Hydrocarbon (HC) contains various unburned hydrocarbons and aldehydes, which are toxic to blood and respiratory tract, and Polycyclic Aromatic Hydrocarbons (PAH) and its derivatives are carcinogenic.
The pollution to air not only comprises industrial waste gas and automobile tail gas, but also comprises formaldehyde released in the processes of decoration, paint baking and the like. Formaldehyde can irritate the nose, eyes and throat, causing headaches, skin damage, and stomach and esophageal burning. Formaldehyde has been identified by the world health organization as a carcinogenic and teratogenic substance, a recognized source of allergy, and also as one of the potentially strong mutagens.
The removal of harmful volatile substances such as formaldehyde, benzene, CO and the like is a hot point of constant attention. At present, the common treatment method is to remove the harmful volatile substances by adsorption, for example, the formaldehyde is removed by using activated carbon, photocatalyst, air purifier, etc. However, the activated carbon has short adsorption saturation time, and the danger of secondary release exists when the adsorption saturation time exceeds a certain period. The photocatalyst decomposes formaldehyde by using ultraviolet rays, and the use of a large amount of ultraviolet rays causes damage to human bodies to different degrees. The air purifier has similar defects with the activated carbon, and has unobvious adsorption effect on other organic volatile matters except formaldehyde, and the excessive using amount of the adsorbent can cause secondary pollution. Therefore, equipment for treating organic volatile matters such as formaldehyde, CO and the like by utilizing catalytic oxidation reaction appears at home and abroad. Some of the volatile substances are adsorbed by preparing certain solution, and then harmful substances are removed through chemical reaction; and some of the particles are removed by combustion after being intensively captured. However, these devices all have certain disadvantages: the reaction efficiency is low; the prepared solution is easy to expire; the particulate matter filter element needs to be replaced periodically; harsh reaction conditions, etc. Therefore, mass production use thereof is limited.
In order to solve the problems of low adsorption efficiency, harsh reaction conditions and the like, the Chinese patent CN101450315A proposes an indoor air purification device which comprises a control system, an induced air system, an adsorption system and a catalytic combustion system and can carry out harmless treatment on various volatile organic pollutants through adsorption, desorption and catalytic combustion. However, the device can not continuously suck in the outside air in the pollutant treatment process, and the operating time interval of the adsorption section and the catalytic combustion section is controlled by using the relay, so that the problems of incomplete purification, excessive purification cycle times, time and electric energy waste and the like can be caused because the time relay has no feedback system and can not calculate the cycle times.
Disclosure of Invention
The invention aims to provide a volatile organic pollutant purification device and a volatile organic pollutant purification method, so that harmful organic volatile matters such as formaldehyde, CO and the like can be effectively converted into harmless substances through catalytic oxidation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a volatile organic pollutant purifier, includes oxidation catalyst converter, draught fan, honeycomb duct and purification adjusting part, the oxidation catalyst converter includes the casing, sets up the catalytic carrier of arranging in the casing at the heating jacket body and the interval in the casing outside, and the one end of honeycomb duct links to each other with the air inlet end of casing, and the other end of honeycomb duct links to each other with the draught fan, purifies adjusting part including setting up the sensor that is used for detecting organic volatile matter concentration (the volume of remaining after reacting promptly) and the controller that links to each other respectively with this sensor, draught fan and heating jacket body at casing air-out end.
Preferably, the purification and regulation assembly further comprises a sensor connected with the controller and used for respectively detecting the oxygen concentration at the air inlet end and the air outlet end of the oxidation catalyst casing (so that the controller can obtain the reaction rate of oxygen in the oxidation catalyst).
Preferably, the purification conditioning assembly further comprises a sensor connected to the controller for detecting the internal temperature of the oxidation catalyst housing.
Preferably, the heating jacket body comprises an electric heating belt (the electric heating belt is arranged on the shell) connected with the controller and a heat insulating material for separating the electric heating belt from the outside.
Preferably, the draft tube is a reducer tube with gradually reduced channel diameter connected between the air outlet side of the induced draft fan and the air inlet end of the oxidation catalyst shell.
Preferably, draught fan and oxidation catalyst converter pass through the floor and support in ground, are convenient for at indoor installation, and the air inlet end and the air-out end of oxidation catalyst converter casing are provided with respectively and are used for the switch (e.g. valve etc.) of this casing with external isolation.
Preferably, the controller performs closed-loop feedback regulation on the wind speed of the induced draft fan and/or the temperature of the heating jacket body according to the reaction rate of oxygen in the oxidation catalyst and/or the residual quantity of organic volatile matters.
A method for purifying volatile organic pollutants, comprising the steps of:
1) placing the volatile organic pollutant purification device indoors, preheating the oxidation catalyst by using the heating sleeve body, and starting the induced draft fan after preheating is finished;
2) the external gas (generally, the gas to be purified with organic volatile pollution) is sucked into the preheated oxidation catalyst, and the gas inside the convection oxidation catalyst is purified (referring to the concentration of the organic volatile) through a catalytic reaction under certain temperature and pressure control and then discharged out of the oxidation catalyst.
Preferably, before the step 1), a sensor for detecting the concentration of the organic volatile matters at the air outlet end (exhaust gas) of the oxidation catalyst shell is calibrated by using the gas which is not polluted by the organic volatile matters.
Preferably, in the step 1), after preheating, calibrating a sensor for detecting oxygen concentrations at an air inlet end and an air outlet end of a shell of the oxidation catalyst by using a certain volume of gas to be purified sucked into the oxidation catalyst, according to an oxygen content (oxygen concentration) difference of the gas in the oxidation catalyst before and after catalytic reaction (purification) (specifically, the corresponding air inlet end and air outlet end), and then turning to the step 2).
Preferably, in the step 2), if the oxygen concentration difference between the air inlet end and the air outlet end of the casing of the oxidation catalyst is greater than the corresponding calibration results of the sensors for detecting the oxygen concentration at the air inlet end and the air outlet end of the oxidation catalyst, the air speed of the induced draft fan is adjusted, so that the organic volatile matters in the gas flowing through the oxidation catalyst completely react (namely, the purification effect is achieved); if the oxygen concentration difference between the air inlet end and the air outlet end of the shell of the oxidation catalyst is less than or equal to the corresponding calibration result, the air speed of the induced draft fan and the temperature of the heating sleeve body are adjusted, so that the organic volatile matters in the gas flowing through the oxidation catalyst completely react.
The invention has the beneficial effects that:
the invention adsorbs oxygen in gas to be purified in the oxidation catalyst, so that the oxygen can fully react with organic volatile matters in the gas flowing process, the structure of the device is more compact, uninterrupted gas purification can be carried out in the space, the purification efficiency is high, and the application range is wide.
Furthermore, by arranging a sensor for detecting the oxygen concentration before and after the reaction and controlling the induced draft fan and the heating sleeve, the control precision and the purification efficiency of the catalytic reaction are improved.
Furthermore, the sensor is calibrated, so that the purification speed is improved, the harsh degree of reaction conditions is reduced, the universality is improved, and the purification cost is reduced.
Drawings
FIG. 1 is a top view of an embodiment of an apparatus for purifying VOC (volatile organic compound) in accordance with the present invention (control panel not shown);
FIG. 2 is a catalyst oxidation control system block diagram;
FIG. 3 is a flow chart of catalyst oxidation control;
FIG. 4 is a left side view of a VOC purification apparatus in an embodiment of the present invention;
FIG. 5 is a perspective view of a VOC purification apparatus in an embodiment of the present invention;
FIG. 6 is a cross-sectional view (A-A) of a VOC purification apparatus in an embodiment of the present invention;
in the figure: 1. the device comprises an induced draft fan, a draft tube 2, a hydrocarbon sensor 3, an oxygen sensor 4, a temperature sensor 5, a control transmission line 6, a control panel 7, a support rib plate 8, an electric heating belt 9, a catalytic carrier 10 and a thermal insulation plate 11.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
Structure of volatile organic pollutant purifier
Referring to fig. 1, 4 and 5, in order to better purify air and reduce the harm of organic volatile to the environment and human body, the invention provides a volatile organic pollutant purification device, which mainly comprises a shell-and-tube type oxidation catalyst, wherein the oxidation catalyst takes fluffy alumina as a carrier, effectively adsorbs oxygen in air, and the incompletely oxidized organic pollutants such as hydrocarbon (for example, formaldehyde), CO and the like discharged into the air rapidly and chemically react with the oxygen adsorbed on the catalytic carrier at a certain temperature and pressure through a metal catalyst attached on the carrier (the carrier loaded with the catalyst is called as a catalytic carrier) to generate pollution-free H2O and CO2. The reactions that mainly occur are as follows:
CO+O2→CO2
HmCn+O2→H2O+CO2
because the oxidation catalyst has certain requirements on reaction temperature and pressure, the oxidation catalyst, the electric heating belt 9 and the induced draft fan 1 are installed together, thereby providing controllable reaction conditions for oxidation reaction. Honeycomb duct 2 (honeycomb duct 2 can adopt the reducing pipe that the passageway diameter reduces gradually to reduce) is installed to draught fan 1's air-out side, so as to reduce purifier's noise and vibration and provide great wind pressure control range, thereby improve oxidation catalyst converter to organic pollutant's treatment effeciency, honeycomb duct 2's exit end welding has the ring flange, this ring flange is the same with oxidation catalyst converter's inlet channel specification, so that be connected at oxidation catalyst converter inlet channel tip with the welding, can fill asbestos gasket between honeycomb duct 2 and oxidation catalyst converter inlet channel's ring flange, prevent purifier takes place to seal not tight because of the high temperature in the use, avoids the gas in honeycomb duct 2 to take place to leak. The outer part of the oxidation catalyst shell corresponding to the position where the catalytic carrier is installed is reserved with space so as to wind the electric heating belt 9 on the outer side of the shell, so that the inner part of the shell can be heated, in order to fully utilize the heat generated by heating the electric heating belt 9, the electric heating belt 9 can be isolated from the outside by using a vacuum heat insulation plate 11, for example, the electric heating belt 9 on the oxidation catalyst shell is covered and tightly wrapped by the vacuum heat insulation plate 11 to form a cylindrical heat insulation layer, and the heat dissipation of the surrounding environment is reduced. The induced draft fan 1 and the air inlet and outlet channels of the oxidation catalyst are provided with the supporting rib plates 8, so that the whole stress of the device is uniform, and the stability of operation is improved. In order to facilitate operation and control, a hydrocarbon sensor 3 (HC sensor for short) for detecting whether organic volatile matters remain is arranged in an exhaust passage of the oxidation catalyst, and a temperature sensor 5 for detecting reaction temperature is arranged in a tube shell (namely an oxidation catalyst shell); an oxygen sensor 4 is also arranged in the air inlet channel and the air outlet channel of the oxidation catalyst, and the reaction rate can be judged according to the change of the oxygen concentration at the air inlet channel and the air outlet channel. Each sensor is connected to a control panel 7 fixed to the heat insulating layer by a control transmission line 6.
Referring to fig. 2, the oxidation catalyst can be adjusted by feedback through the sensors installed inside, that is, signals of the sensors are input into a controller of the control panel 7, and output signals of the controller realize closed-loop control of the heating temperature of the electric heating belt 9 and the wind speed of the induced draft fan 1 by controlling current, so that the reaction efficiency is improved, and the purified air can be continuously output while harmful organic volatile matters contained in the air sucked into the oxidation catalyst are generated into harmless substances through oxidation reaction.
The operation flow of the volatile organic pollutant purification device is as follows: the power switch on the control panel 7 is turned on, the induced draft fan 1, the electric heating tapes 9, each sensor and the controller start to work, wait for the electric heating tapes 9 to heat the inside of the oxidation catalyst until the temperature required by the reaction is reached, at the moment, the gas (for example, air) to be purified is sucked into the draft tube 2 through the induced draft fan 1 and then enters the working area of the oxidation catalyst (namely, the area filled with the catalytic carrier inside), the gas passes through the inside of the oxidation catalyst, under the catalytic action of the carrier, the oxygen and the organic volatile matters sucked together are subjected to oxidation reaction, the purified gas is discharged along the gas outlet channel of the oxidation catalyst, and one-time circulation is completed (namely, the gas sucked from the outside is discharged to the outside after being purified inside the catalyst).
Control of volatile organic pollutant purifier
When the power switch is turned on, the initial temperature of the oxidation catalyst is low, the heat engine is needed, the controller only controls the electric heating belt 9 to work at the moment, the draught fan 1 stops working, after the internal temperature of the oxidation catalyst reaches a certain numerical value, the controller controls the draught fan 1 to work, the purification formally starts at the moment, and the external gas is sent into the oxidation catalyst. The temperature sensor 5 continuously monitors the temperature in the oxidation catalyst, the HC sensor monitors organic volatile matters, and the oxygen sensor 4 monitors the oxygen content difference before and after the reaction; monitoring data are input into the controller for feedback, and the controller adjusts and controls the monitoring data according to different types of conditions. Meanwhile, the working conditions of all parts (such as whether the induced draft fan rotates or not) can be manually selected and adjusted.
Referring to fig. 3, the adjustment control flow is that the initial input quantity is a heat engine temperature value, and when the heat engine temperature value is greater than a set value (refer to the reaction temperature), the controller starts to adjust the temperature and the wind speed:
in the first situation, when the difference value of the oxygen content before and after the reaction (i.e. the air inlet and outlet channels of the oxidation catalyst) monitored by the oxygen sensor 4 is larger than a preset value and the monitoring result of the HC sensor is a non-numerical value, the controller keeps the temperature unchanged and increases the air speed through regulation. This is because a large difference in oxygen content before and after the reaction indicates that the reaction is relatively complete, and most of the oxygen taken in reacts inside the oxidation catalyst, while the organic volatiles are removed. At the moment, the reaction temperature is kept unchanged, the wind speed is increased, the oxygen in the oxidation catalyst can be more fully utilized, and the purification efficiency is increased.
And in the second situation, when the oxygen content difference value before and after the reaction monitored by the oxygen sensor 4 is larger than the preset value and the monitoring result of the HC sensor is a numerical value, the controller keeps the temperature unchanged and reduces the wind speed through regulation. This is because although most of the inhaled oxygen is reacted, the discharged gas still has residual organic volatiles, which indicates that the inhaled gas has a high content of organic volatiles, and thus some of the organic volatiles are discharged in short of the reaction. Reducing the wind velocity at this time can increase the residence time of the organic volatiles in the oxidation catalyst, thereby increasing the purification efficiency.
And in the third case, when the difference value of the oxygen content before and after the reaction monitored by the oxygen sensor 4 is smaller than (or equal to) a preset value and the monitoring result of the HC sensor is a numerical value, the controller increases the temperature and reduces the wind speed through adjustment. This is because only a small portion of the oxygen gas inhaled reacts with the organic volatiles and the reaction is incomplete. At this time, the reaction temperature is increased, and the residence time of the organic volatile in the oxidation catalyst is increased, thereby increasing the purification efficiency. When the temperature reaches a certain limit (typically greater than the heat engine temperature set point), the controller does not cause the temperature to rise any further, thereby preventing the oxidation catalyst from becoming dangerous due to overheating.
And in the fourth situation, when the oxygen content difference value before and after the reaction monitored by the oxygen sensor 4 is close to 0 and the monitoring result of the HC sensor is no value, the controller reduces the temperature and the wind speed by adjusting. This is because although a small amount of oxygen is absorbed and reacted, the discharged gas has no significant organic volatile residue, indicating that the organic volatile in the gas is completely purified. At this time, as the temperature and the wind speed are lowered, an indicator lamp on the control panel 7 is turned on, and an alarm sound is generated to prompt the turning off of the power switch, and if the operation is not performed within a certain time interval (for example, 3 minutes), the controller automatically turns off the power.
The numerical value referred by the input signal of the controller during comparison is calibrated in advance, so that the control precision is improved, and the judgment error is prevented. For calibration of the HC sensor: placing the HC sensor in clean air without pollution, electrifying, and recording the numerical value; when tested, the test result at the outlet channel of the oxidation catalyst shows no when the value is less than or equal to 100-120% (for example, 105%) of the value, and otherwise shows yes. Calibration for oxygen sensor: mixing a certain amount of organic volatile matters with air, heating to perform catalytic reaction until the organic volatile matters completely react and no residual exists, detecting the oxygen content, calculating the difference value between the oxygen content before reaction, selecting 65-75% (for example, 70%) of the difference value as a preset value, and generally performing calibration again when the gas to be purified changes.
(III) efficacy experiments
The method comprises the steps of testing by using the installed and debugged equipment, measuring the concentration of methanol in a baking finish house (experimental point) with a sealed space during testing, operating the installed and debugged equipment for a period of time, and measuring the concentration of formaldehyde in the sealed space again after the equipment is shut down. The temperature of the oxidation catalytic reaction is between 200 ℃ and 300 ℃.
TABLE 1 type of materials used and Specifications for the device
The apparatus is installed with specific reference to table 1, wherein an adsorption bed having a plurality of through channels (see fig. 6) filled with a catalytic carrier 10 is disposed in the oxidation catalyst.
The specific test steps are as follows: spraying paint in two baking finish rooms with the specification of 5000 multiplied by 2500mm for a certain time, putting the formaldehyde self-testing box into the two baking finish rooms after keeping the temperature of the air in the baking finish rooms constant, taking out after 30-40 minutes, and measuring the concentration of formaldehyde in the air. The equipment is placed into one of the paint baking rooms (the other paint baking room is used for comparison reference, and formaldehyde concentration values of the two paint baking rooms are compared after the two paint baking rooms are purified for a certain time), so that air flowing between the two paint baking rooms and the outside is avoided as much as possible. Firstly, calibrating equipment, starting to preheat (namely, heating the machine), entering a calibration mode, enabling an oxidation catalyst to suck a certain amount of air in a baking finish house, recording a detection value of an oxygen sensor at an air inlet channel, closing the air inlet and outlet channel (without air inlet pressure at the moment) by using a valve, enabling the sucked air to react in the oxidation catalyst until a monitoring result of the HC sensor on a control panel shows 'none', recording a detection value of the oxygen sensor at the air outlet channel, calculating a difference value of the two detection values and inputting a preset value. After the calibration is finished, the equipment starts to work, the oxidation catalyst is controlled through feedback regulation until the purification of organic volatile matters (such as formaldehyde) in the baking finish house is finished, then the formaldehyde concentration in the baking finish house is measured by using the formaldehyde self-testing box again, and the working efficiency of the oxidation catalyst is calculated.
The initial measurement of the concentration value of formaldehyde in two baking finish rooms is 0.5mg/m3And 0.48mg/m3The concentration values of formaldehyde after the test are respectively 0.1mg/m3And 0.42mg/m3The period of the operation is 2 hours, and the comparison shows that 12.5 percent of formaldehyde is naturally volatilized. Based on this calculation, the catalyst operating efficiency was 16.875mg/m per hour of conversion3The higher conversion efficiency can meet the working requirement, and is beneficial to saving time and resources.
(IV) applications
The volatile organic pollutant purifying device provided by the invention can be applied to any indoor containing organic volatile matters. The device is not influenced by the ambient temperature, has high purification efficiency and has more obvious use effect in certain indoor environments. For example, produce the more baking finish room of formaldehyde, the baking finish process is because the air is heated, and the circulation is poor, has further increased indoor harmful gas concentration, utilizes above-mentioned volatile organic pollutant purifier can effectively carry out air purification to the airtight space of baking finish room, and exhaust gas has the uniform temperature moreover, can guarantee that airtight space maintains higher temperature value, is favorable to the baking finish room production. For example, when a house is decorated in winter, the indoor temperature is low, ventilation is not facilitated, indoor formaldehyde is retained for a long time, and harmful substances are adsorbed in gaps of furniture, floors and the like and cannot be discharged in a short time. For another example, in northern rural areas, a stove is used for heating, coal is incompletely combusted in the stove to generate CO, if a chimney opening is partially blocked when snowing, ventilation is affected, part of smoke is sucked back and discharged into a room, the CO concentration in the closed space is increased to a certain degree, harm can be generated to human health, and the volatile organic pollutant purification device can be used for effectively reducing the indoor CO concentration and increasing the indoor temperature.

Claims (10)

1. A volatile organic pollutant purifier which characterized in that: including oxidation catalyst converter, draught fan (1), honeycomb duct (2) and purification adjusting part, the oxidation catalyst converter includes the casing, set up heating jacket body and the interval in the casing outside and arrange catalytic carrier (10) in the casing, the one end of honeycomb duct (2) links to each other with the air inlet end of casing, the other end of honeycomb duct links to each other with draught fan (1), purify adjusting part including setting up at casing air-out end be used for detecting the sensor of organic volatile matter concentration and with this sensor, draught fan (1) and the controller that the heating jacket body links to each other respectively.
2. The voc purification apparatus of claim 1, wherein: purify the adjusting part and still include the sensor that is used for detecting the oxygen concentration of the air inlet end, the air-out end of oxidation catalyst converter casing respectively that link to each other with the controller to and the sensor that is used for detecting the inside temperature of oxidation catalyst converter casing that links to each other with the controller.
3. The voc purification apparatus of claim 1, wherein: the heating jacket body comprises an electric heating belt (9) connected with the controller and a heat insulation material used for separating the electric heating belt (9) from the outside.
4. The voc purification apparatus of claim 1, wherein: the draft tube (2) is a reducer tube with the diameter of a channel gradually reduced and connected between the air outlet side of the induced draft fan (1) and the air inlet end of the oxidation catalyst shell.
5. The voc purification apparatus of claim 1, wherein: draught fan (1) and oxidation catalyst converter pass through the floor and support in ground, and the air inlet end and the air-out end of oxidation catalyst converter casing are provided with the switch that is used for keeping apart this casing with the external world respectively.
6. The voc purification apparatus of claim 1, wherein: and the controller performs closed-loop feedback regulation on the wind speed of the induced draft fan and/or the temperature of the heating jacket body according to the reaction rate of oxygen in the oxidation catalyst and/or the residual quantity of organic volatile matters.
7. A method for purifying volatile organic pollutants is characterized by comprising the following steps: the method comprises the following steps:
1) preheating the oxidation catalyst by using a heating sleeve body arranged on the outer side of the oxidation catalyst shell, and starting a draught fan (1) after preheating is finished;
2) and (3) sucking external gas into the preheated oxidation catalyst, purifying the gas in the convection oxidation catalyst through a catalytic reaction at a certain temperature and under a certain pressure, and discharging the gas out of the oxidation catalyst.
8. The method of claim 7, wherein the volatile organic compound is selected from the group consisting of: calibrating a sensor for detecting the concentration of organic volatiles in the exhaust gas of the oxidation catalyst with the gas uncontaminated by organic volatiles before step 1).
9. The method of claim 7, wherein the volatile organic compound is selected from the group consisting of: the step 1) further comprises the following steps: after preheating, calibrating a sensor for detecting the oxygen concentration of the gas sucked into and discharged from the oxidation catalyst by using a certain volume of gas to be purified sucked into the oxidation catalyst according to the oxygen content difference of the gas in the oxidation catalyst before and after purification.
10. A method of purifying volatile organic contaminants as claimed in claim 9, wherein: in the step 2), if the oxygen concentration difference between the gas sucked into the oxidation catalyst and the gas discharged from the oxidation catalyst is greater than the corresponding calibration result, adjusting the wind speed of the induced draft fan to ensure that the organic volatile matters in the gas completely react; if the oxygen concentration difference between the gas sucked into the oxidation catalyst shell and the gas discharged from the oxidation catalyst shell is smaller than or equal to the corresponding calibration result, the wind speed of the induced draft fan and the temperature of the heating sleeve body are adjusted, so that the organic volatile matters in the gas completely react.
CN202010091282.6A 2020-02-13 2020-02-13 Volatile organic pollutant purification device and method Pending CN111195481A (en)

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Cited By (1)

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