CN102908860A - Manufacturing method of function module used for absorbing fog drops and VOC (volatile organic compounds) in airflows - Google Patents

Abstract

The invention discloses a method for preparing a functional module for absorbing mist and VOC in airflow, which belongs to the technical field of material preparation and environmental protection. The method is to use paper honeycomb as the base material, punch holes in different positions of adjacent partition layers, then dip the paper honeycomb module in the slurry containing absorbent powder, take it out and dry it to obtain The functional module of medium mist and VOC, the air flow is baffled in this module, and the mist and VOC will be captured by the absorbent on the inner wall of the paper honeycomb and the surface of the separator layer, so that the module can be used at a lower pressure drop In the case of high-efficiency removal of mist and VOC in the airflow, it is more suitable for purification of catering waste gas.

Description

A preparation method of a functional module for absorbing mist and VOC in airflow

technical field

The invention relates to a preparation method of a functional module for absorbing mist and VOC in airflow, and belongs to the technical fields of material preparation and environmental protection.

Background technique

With the rapid development of my country's economy, the haze air pollution in large and medium-sized cities, economically developed areas and areas with intensive basic industries in my country is becoming more and more serious. With my country's increasingly stringent restrictions on SOx and NOx emissions, and the continuous use of related environmental protection technologies and devices, the total amount of SOx and NOx pollutant emissions in the atmospheric environment in my country has been decreasing year by year. However, from the current test results, my country's Yangtze River Delta On the contrary, the smog pollution in the Pearl River Delta and Beijing-Tianjin-Hebei areas is becoming more and more serious, which has seriously threatened the health of the people and the sustainable development of the economy.

With the current in-depth research on haze pollution traceability, people have found that urban volatile organic compounds (VOC) are important precursors of haze pollution, and recent studies have found that VOCs emitted from non-point sources such as catering and decoration The proportion of total VOC emissions is close to 20%. At the same time, due to the close relationship between such emissions and human settlement density, the emission time is relatively concentrated, and it is likely to be one of the culprits of the current severe local air pollution in cities.

Food cooking methods with Chinese characteristics use a large number of techniques such as frying, frying, and frying, resulting in a large amount of mist droplets composed of oil-water mixture and VOC in the exhaust gas, which makes it difficult for ordinary range hoods that use baffle method to completely eliminate Therefore, a simple and effective technical solution is needed to purify the catering waste gas treated by the range hood. In addition, since the catering industry often does not have fan assistance, the purification module must have a very low pressure drop. Therefore, the common fixed bed adsorption method cannot be used due to too large a pressure drop. Although the fluidized bed adsorption method has a low bed pressure drop, the gas distribution plate in the lower layer has a large pressure drop, and generally needs to be installed after the fluidized bed. Cyclone separator to remove escaped adsorbent particles due to crushing, which is often unacceptable for catering waste gas treatment occasions.

To sum up, at present, my country urgently needs a technical solution with small air resistance, large flux, and effective removal of fog droplets and VOC in the exhaust gas of the catering industry. important.

Contents of the invention

The object of the present invention is to obtain a module with low air resistance and high throughput for efficient removal of mist and VOC by a simple method. The module has a compact structure, simple manufacturing method, and low pressure drop, and has a certain ability to capture mist droplets, aerosol particles, and VOC in catering waste gas.

The purpose of the present invention is achieved through the following technical scheme: use paper honeycomb board as the matrix, punch holes in different positions of adjacent separator layers, then immerse the paper honeycomb module in the slurry containing absorbent powder, take out After drying, the functional module for absorbing mist and VOC in the airflow is obtained. The paper honeycomb used is a paper honeycomb with a regular hexagonal cross section, and the radius of the circumscribed circle of the regular hexagon is 4mm ~ 200mm; The absorbent powder is diatomite, activated carbon powder, activated coke powder, chopped carbon fiber, chopped activated carbon fiber, chopped glass fiber, activated alumina powder, molecular sieve powder, zeolite powder, expanded vermiculite powder, montmorillonite powder and hydrotalcite powder or any mixture of several; the solid content of the slurry used to load absorbent powder in the method is 1wt% ~ 50wt%; the method used to load absorbent powder The slurry contains an adhesive for adhering the adsorbent to the honeycomb layer and the separator layer. The adhesive is gelatinized starch, cationic etherified starch, sodium carboxymethyl cellulose, methyl cellulose, molecular weight One or any mixture of polyethylene glycol with a molecular weight between 1,000 and 25,000 and polyvinyl alcohol with a molecular weight between 25,000 and 300,000, and the mass concentration of the adhesive in the slurry is 0.1wt%. ~5wt%.

Since the holes are opened at different positions of the adjacent partition layers of the paper honeycomb, the airflow containing the mist and VOC will flow through the channels of the multi-layer paper honeycomb, which greatly improves the penetration of the mist and VOC by the inner wall of the honeycomb layer and the partition. The probability of board layer absorption and capture, in addition, since the inner wall of the honeycomb layer and the surface of the partition layer are loaded with adsorbents, this also greatly improves the module's ability to absorb VOC and droplets. When there are many droplets in the airflow, diatomaceous earth can be selected , chopped carbon fiber, chopped glass fiber, activated alumina powder, molecular sieve powder, zeolite powder, expanded vermiculite powder, montmorillonite powder or hydrotalcite powder, these powders with high oil absorption value are used as absorbents for functional modules, so It can absorb more mist of oil-water mixture in catering waste gas; when the VOC in the waste gas is high, activated carbon powder, activated coke powder or chopped activated carbon fiber can be selected as the adsorbent, which can effectively absorb the VOC in the waste gas. In general, several layers of diatomite, chopped carbon fiber, chopped glass fiber, activated alumina powder, molecular sieve raw powder, zeolite powder, expanded vermiculite powder, montmorillonite powder, and hydrotalcite powder can be used as adsorption materials first. The paper honeycomb layer of the agent, first completely remove the mist droplets in the airflow, and then place several layers of paper honeycomb layers with activated carbon powder, activated coke powder or chopped activated carbon fiber as the adsorbent to remove the residual VOC in the airflow , This arrangement can give full play to the adsorption performance of activated carbon, activated coke and other adsorbents on VOC, and prevent them from being covered and blocked by mist droplets containing viscous oil and water.

Description of drawings

The dust removal module of the present invention can be represented by Fig. 1 , Fig. 2 and Fig. 3 of the description. In Fig. 1, Fig. 2 and Fig. 3: 1 represents the partition layer; 2 represents the honeycomb layer; 3 represents the openings on the partition layer (adjacent partition layers have holes at different positions in the top view to ensure gas folding flow through); 4 represents airflow containing mist and VOC; 5 represents airflow after purification.

Figure 1 shows the oblique view after the separation of two separator layers and two honeycomb layers, while the actual module is formed by bonding many separator layers and honeycomb layers alternately, and the number of layers of the actual module can be selected arbitrarily . Figure 2 is a top view of the dust removal module, drawing two adjacent partition layers, and giving a scheme for opening holes. Fig. 3 is a sectional view along the A-A direction of Fig. 2, in which the situation of the module composed of 10 layers of honeycomb layers and 10 layers of partition layers is drawn, and the flow lines of the gas in the module are drawn. Attached drawings 1, 2, and 3 are used to intuitively explain this technical solution, but they do not limit the shape and number of layers of the paper honeycomb module in this technical solution. The cross-section of the channel needs to be round, oval, pear-shaped, triangular, square and polygonal, and the number of layers can be selected arbitrarily, and the shape and size of the openings of the adjacent partition layers can also be selected arbitrarily, as long as the adjacent partitions The positions of the openings of the layers are different and it is enough to ensure that the air flow is deflected and passed between different honeycomb layers.

Detailed ways

The invention provides a method for preparing a functional module for absorbing mist and VOC in the airflow. Its specific technical solution is realized in the following way: use paper honeycomb board as the substrate, and punch holes at different positions of adjacent partition layers , and then dip the paper honeycomb module in the slurry containing absorbent powder, take it out and dry it to get the functional module for absorbing the mist and VOC in the airflow. The paper honeycomb used is a paper with a regular hexagonal cross section. honeycomb, the radius of the circumscribed circle of a regular hexagon is 4mm ~ 200mm; the absorbent powder in the method is diatomite, activated carbon powder, activated coke powder, chopped carbon fiber, chopped activated carbon fiber, chopped glass fiber, active One or any mixture of alumina powder, molecular sieve powder, zeolite powder, expanded vermiculite powder, montmorillonite powder and hydrotalcite powder; the solid content of the slurry used to load absorbent powder in the method It is 1wt%～50wt%; The slurry that is used to load absorbent powder in the described method contains adhesive agent, is used for adsorbent adhered on the honeycomb layer and separator layer, and adhesive agent is gelatinized starch, Cationic etherified starch, sodium carboxymethyl cellulose, methyl cellulose, polyethylene glycol with a molecular weight between 1000 and 25,000, and polyvinyl alcohol with a molecular weight between 25,000 and 300,000 A mixture of species, the mass concentration of the adhesive in the slurry is 0.1wt%~5wt%.

List several specific examples below, to further understand the present invention:

Example 1:

Take 10 circular paper honeycomb panels with a diameter of 200mm (containing 10 layers of honeycomb layers and 10 layers of separator layers respectively), the thickness of each layer of paper honeycomb panels is 100mm, and the side length of the regular hexagon of the honeycomb layer section is 4mm. Open holes in different positions of adjacent separator layers, and dip 8 layers of paper honeycomb panels in a slurry containing 30% diatomaceous earth and 0.1% polyvinyl alcohol (MW300,000), take them out and dry them, while the other 2 The paper honeycomb layer is immersed in a slurry containing 10% activated carbon powder and 0.5% gelatinized starch, taken out and dried, the paper honeycomb layer loaded with diatomaceous earth is placed in front, and the paper honeycomb layer loaded with activated carbon is placed behind , a functional module that can effectively remove mist and VOC in exhaust gas is obtained.

Example 2:

Take 20 square paper honeycomb panels with a size of 300mm×300mm (containing 20 layers of honeycomb layers and 20 layers of separator layers respectively), the thickness of each layer of paper honeycomb panels is 150mm, and the side length of the regular hexagon of the honeycomb layer section is 10mm , open holes at different positions of adjacent separator layers, and impregnate 10 layers of paper honeycomb panels in a slurry containing 50% expanded vermiculite powder and 5% polyethylene glycol (MW1000), take them out and dry them, while the other The 10-layer paper honeycomb is immersed in a slurry containing 1% active coke powder and 0.1% methylcellulose, taken out and dried, the paper honeycomb layer loaded with vermiculite powder is placed in front, and the paper honeycomb layer loaded with active coke After being installed, a functional module that can effectively remove mist and VOC in the exhaust gas is obtained.

Example 3:

Take 30 pieces of paper honeycomb panels with a diameter of 1000mm (containing 30 layers of honeycomb layers and 30 layers of separator layers respectively), the thickness of each layer of paper honeycomb panels is 200mm, and the side length of the regular hexagon of the honeycomb layer section is 200mm. Holes were opened at different positions adjacent to the separator layer, and 22 layers of paper honeycomb panels were dipped in a slurry containing 40% activated alumina powder and 2% polyvinyl alcohol (MW 25,000), taken out and dried, while the other The 8-layer paper honeycomb is impregnated in a slurry containing 20% chopped activated carbon fiber and 0.1% cationic etherified starch, taken out and dried, the paper honeycomb layer loaded with activated alumina is placed in front, and the chopped activated carbon After the fibrous paper honeycomb is placed, a functional module that can effectively remove mist and VOC in the exhaust gas is obtained.

Example 4:

Take 15 rectangular paper honeycomb panels with a size of 100mm×200mm (including 15 layers of honeycomb layers and 15 layers of separator layers), the thickness of each layer of paper honeycomb panels is 20mm, and the side length of the regular hexagon of the honeycomb layer section is 6mm , open holes at different positions of adjacent separator layers, and dip 10 layers of paper honeycomb panels in a slurry containing 40% molecular sieve powder and 0.2% polyethylene glycol (MW25000), take them out and dry them, while the other The 5-layer paper honeycomb is impregnated in a slurry containing 10% activated carbon powder and 0.5% sodium carboxymethyl cellulose, taken out and dried, the paper honeycomb layer loaded with molecular sieve raw powder is placed in front, and the paper honeycomb layer loaded with activated carbon After the honeycomb is placed, a functional module that can effectively remove mist and VOC in the exhaust gas is obtained.

Example 5:

Take 20 rectangular paper honeycomb panels with a size of 400mm×200mm (including 20 layers of honeycomb layers and 20 layers of separator layers), the thickness of each layer of paper honeycomb panels is 20mm, and the side length of the regular hexagon of the honeycomb layer section is 8mm , open holes at different positions of the adjacent separator layers, and soak 10 layers of paper honeycomb panels in a slurry containing 20% zeolite powder and 1% gelatinized starch, take them out and dry them, while the other 10 layers of paper honeycomb panels are Immerse in a slurry containing 20% activated carbon powder and 0.8% polyvinyl alcohol (MW10000), take it out and dry it, place the paper honeycomb layer loaded with zeolite powder in front, and place the paper honeycomb layer loaded with activated carbon in the back, then A functional module that can effectively remove mist and VOC in exhaust gas was obtained.

Embodiment 6:

Take 15 rectangular paper honeycomb panels with a diameter of 300mm (respectively containing 15 layers of honeycomb layers and 15 layers of separator layers), the thickness of each layer of paper honeycomb panels is 30mm, and the side length of the regular hexagon of the honeycomb layer section is 6mm. Holes were opened at different positions of adjacent separator layers, and 10 layers of paper honeycomb panels were dipped in a slurry containing 20% montmorillonite powder and 0.2% polyvinyl alcohol (MW8000), taken out and dried, while the other 5 layers The paper honeycomb is immersed in a slurry containing 20% active coke powder and 0.5% polyvinyl alcohol (MW8000), taken out and dried, the paper honeycomb layer loaded with montmorillonite powder is placed in front, and the loaded active coke powder After the paper honeycomb is placed, a functional module that can effectively remove mist and VOC in the exhaust gas is obtained.

Claims (4)

1. preparation method who be used for to absorb the functional module of air-flow droplet and VOC, it is characterized in that this method realizes by the following technical solutions: the employing honeycomb card board is matrix, diverse location punching at adjacent carrier ring, again the paper honeycomb module is immersed in the slurry that contains absorbent powder, taking-up just obtains for the functional module that absorbs air-flow droplet and VOC by oven dry, the paper honeycomb that adopts is that the cross section is orthohexagonal paper honeycomb, and orthohexagonal external radius of a circle is 4mm ~ 200mm.

2. the preparation method of a kind of functional module for absorbing air-flow droplet and VOC as claimed in claim 1 is characterized in that: the absorbent powder on the module is a kind of in the middle of diatomite, active carbon powder, activated coke powder, chopped carbon fiber, chopped NACF, short glass fiber, active oxidation aluminium powder, molecular screen primary powder, zeolite powder, expanded vermiculite powder, imvite powder and the neatly stone flour or any several mixture.

3. the preparation method of a kind of functional module for absorbing air-flow droplet and VOC as claimed in claim 1, it is characterized in that: the solid content that is used for the slurry of load absorbent powder is 1wt% ~ 50wt%.

4. the preparation method of a kind of functional module for absorbing air-flow droplet and VOC as claimed in claim 1, it is characterized in that: the slurry that is used for the load absorbent powder contains adhesive, be used for adsorbent is sticked to keriotheca and carrier ring, adhesive is gelatinized starch, the cation etherification starch, sodium carboxymethylcellulose, methylcellulose, molecular weight is a kind of or any several mixture in the middle of the polyvinyl alcohol between 2.5 ten thousand ~ 300,000 at the polyethylene glycol between 1000 ~ 2.5 ten thousand and molecular weight, and the mass concentration of adhesive in slurry is 0.1wt% ~ 5wt%.

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