Energy-saving high-throughput film coating filter media results fill in the blanks

The reporter learned from the China Environmental Protection Industry Association on November 24 that the association organized and held an appraisal meeting of the achievements of "key technologies and industrialization of energy-saving high-flux coated filter materials" in a combination of online and offline methods
.
The appraisal expert committee, chaired by Academician Hao Jiming of Tsinghua University, unanimously agreed that the overall results of the project have reached the international advanced level, and its air permeability has reached the international leading level
.

The project is jointly completed
by Qingyuan Innovation Lab, Xiamen Grid Environmental Protection Technology Co.
, Ltd.
, Yuanfuxin (Xiamen) Energy Saving New Material Technology Co.
, Ltd.
and Fuzhou University 。 Cai Weilong, the main technology developer of the project and a researcher at the School of Petrochemical Technology of Fuzhou University, told reporters that the key technology of energy-saving high-throughput coated filter material combines polytetrafluoroethylene (PTFE) resin characteristics, biaxially oriented microporous membrane theory, substrate structure design innovation, high-temperature hot pressing film technology principle and other theories-technologies, mainly with three major innovation points: First, a new process for the production of three-dimensional stretched fibrillated PTFE microporous membrane has been developed, which solves the problem of uneven film thickness produced by the traditional biaxial stretching process.
The air permeability of the membrane is greater than 220L/dm²·min; Second, the structure of the substrate based on "three-dimensional inter-embedding asymmetry" and the progressive needle punching process were developed, which solved the structural defects of the traditional coated substrate.
The third is to develop a new high-temperature longitudinal tension medium pressure laminating process, which makes up for the defects of high temperature and high pressure laminating filter material process that is easy to stick to rolls and improves production efficiency
.

Based on the above innovations, the achievement breaks through the bottleneck of the traditional coated filter material with a permeability of less than 50L/dm²·min, the energy-saving high-flux coated filter material eliminates the interface effect between the microporous membrane and the substrate, reduces the resistance by 40%, extends the ash cleaning cycle by more than 2 times, increases the filtration efficiency by an order of magnitude, solves the common technical problems of the industry with small flux and high resistance of the traditional coated filter material, and opens up the last hurdle
of upgrading from "high-performance filter material" to "high-tech filter material" 。 This product has changed the status quo that the key technologies and products of China's high-throughput PTFE coated filter media are monopolized by foreign companies, solved the key technical problems in this field, and reduced the domestic dependence
on imported high-end filter materials.

According to Cai Weilong, coal-fired power plants, steel, cement, waste incineration power generation and other industrial fields, the demand for fine particulate matter dust removal in flue gas is very high, but at present, China is still relatively lacking in the development of high-flux PTFE coated filter materials in related fields, and related enterprises in the United States have developed low-resistance fifth-generation PTFE microporous membranes and low-resistance filter bag products
.
In the field with relatively high requirements for energy conservation and emission reduction in the soot filtration link, at present, China's high-flux PTFE coated filter material basically relies on imports, and its price is often several times or even more than ten times that of domestic products, which restricts the development of
domestic related industries.

At present, the achievement has applied for 5 patents, published 5 SCI papers, and presided over the drafting of 4 industry standards
.
The appraisal expert committee suggested that further develop product categories, promote product standardization, lead the upgrading of domestic high-performance filter materials, become the industry product technology innovation and quality benchmark, promote the development of China's energy-saving high-flux film filter material market, and accelerate the promotion and application
of the achievement in the field of ultra-low emission purification of flue gas.

In this regard, Cai Weilong said that since the product was developed and launched, it has carried out a number of engineering applications
in coal-fired power plants, steel, cement, waste incineration power generation and other fields.
In the chemical industry, not only in the self-built coal-fired power plant and solid waste hazardous waste incineration device has been applied, but also in the catalyst recovery and other refining and chemical fields, good application results
have been achieved.
In the next step, the project team will continue to improve product performance, expand product series, and at the same time focus on promoting relevant standardization construction and accelerating the application and promotion of relevant achievements in electric power, building materials, chemical industry and
other fields.