Diesel Particulate Filter (DPF) Ash Cleaning

This article summarizes the most prevalent DPF ash cleaning process available.  The article presents the application of  cleaning techniques, as well as a customized approach to ash cleaning based on the specific ash properties and distribution in the DPF.

Available Cleaning Processes

A number of ash cleaning systems exist, with the most common being pneumatic-based, utilizing reverse flow of air through the DPF to blow out the accumulated material.  The frequency of filter cleaning is generally specified by the engine or equipment manufacturer, based on pre-determined maintenance intervals.  The actual frequency of DPF ash cleaning will depend on many factors including the effectiveness of an previous cleanings (i.e. amount of residual ash), engine oil consumption, and the vehicle drive cycle.

The ease with which ash can be removed form the DPF channels depends on two primary factors, namely the strength of the ash bond to the DPF walls, and the location of the ash deposits within the filter.  For most DPF applications, a large quantity of the ash is packed in the end plugs.  This type of ash is generally the most difficult to remove using conventional pneumatic cleaning approaches.  Regardless of the specific cleaning system, pneumatic approaches are limited by the fluid dynamics, which drives the flow along the path of least resistance.  As shown in Figure 1 reverse flow by-passes much of the ash plug, flowing instead around the plug and through the open portion of the channels.


Why is this important for DPF ash cleaning?

Not all DPF ash is the same, and not all DPFs benefit equally from the same type of cleaning process. Filters can be most efficiently cleaned and recovered when cleaning processes are selected which are designed to target the specific ash deposits present in the filter.  DPF inspection and diagnostics are a key component of any cleaning process to ensure cleaning effectiveness and track filter health.

DPF Filters -How to Cure Your Sick Car For Cost-Effective Way!

Starting with 2007 model years in European, diesel trucks are “blessed” with a diesel particulate filter (DPF). DPFs grab soot from your exhaust before it blows out into the environment.

As the exhaust gases pass through the filter, it captures somewhere between more than 95% of diesel particulate matter (PM). DPF maintenance is relatively straightforward. Over time, soot builds up in the filter walls and must be cleared out. A warning light usually shows up indicating it is time to literally burn out the accumulated soot. This process of burning is called regeneration. In addition to regeneration, periodic DPF cleaning is required too.

DPF Removal?

Driving without a DPF Filter can be against the law and quite unnecessary. Already, more than 1,000 diesel car owners have been caught removing the filter, though experts believe that the problem is much more prevalent.

These filters easily become clogged, especially when driven by vehicles in the city. Town and city cars will often be driven at low speeds in residential areas without ever getting a motorway run that can often unclog the DPF filter and regenerate it.

Replacements tend to be expensive,at least €3000 , which is why many of the top garages have offered to take them off completely.

How do I make my DPF Filter without spending more and more?

DPF regeneration is the core , GXLJ actively seeks the opportunities to license its technologies. By leveraging GXLJ’s technologies, our company can achieve enhanced competitiveness through lower research and development costs and reduced time to market. Currently these two patented regeneration filter are available for heavy duty vehicle diesel applications and off-road diesel products.

Our Advantage

– Successful filter regeneration by optimized burner system regardless of any running conditions

– Regeneration in idling and low speed operation

– Catalytic regeneration in medium and high speed operation

– Minimized regeneration time by state-of-the-art control logic

– Optimized design to prevent thermal shock and HC slip

– Setup disassemble flanges to replace broken DPF substrate , keep the stainless steel housing shell original

-No need DPF removal maintenance and clean too often ,2-3 time one year ,saving cleaning cost more than 90%


So are you guys your diesel cars now also installing DPF or preparing to purchase original DPF? As known recently, we have batch of DPF filters installed in some users where to start running, the effect has also been tested. Hope that our equipment will solve your immediate needs at the expense of DPF.




Langjie Euro IV Catalyst Converter with Muffler Mass Production for Yuchai Bus

Huihuang Langjie started cooperation with Yuchai Group since 2001.

We maintain a very well partnership till today, and supply more and more products for their new product categories.

In June, latest batch of Langjie Euro IV Catalyst Converter with Muffler were on Mass Production for Yuchai new Bus.

As the  delivery date was very close, all products were packed once they are finished and passed quality inspection.

Yuchai new  buses were equipped with our brand new Euro IV Catalyst Converter with Muffler. As you saw, they are quit compatible.

Batch assembly completed and will handed over to city bus company soon.

Holiday Breaks, Mid-Autumn Festival & National Day

Mid-Autumn Festival arriving in China along with National Day, so we take 8 days break: from Oct 1st to 8th. Wish all my friends have great holiday time!

Why Mid Autumn Day so important for us? And what is a Moon Cake?

Company gave each staff a big Moon cake as holiday gifts.

And even the Panda can’t wait any longer!

Holiday here we come!

Air pollution more than half of environmental complaints in China

BEIJING — The Ministry of Environmental Protection (MEP) received information from more than 88,000 members of the public about pollution in the first quarter of 2017, with air pollution topping complaints, it said Thursday.

Most of the complaints were lodged through the telephone hotline “12369” and the remainder through the official MEP WeChat account and website. More than 63,000 cases have been concluded.

Of all, 55 percent were related to air quality, while pollution of noise, water and solid waste accounted for 30 percent, 10 percent and seven percent, respectively, according to the ministry.

Construction firms were the subject of the majority of complaints — 33 percent of the total, followed by chemical production and hospitality entities.

Complaints in north China focused on dust emission from boilers and steel mills, while the south of the country was irked by the unpleasant stench from landfills. Industrial waste gas was a common complaint in eastern regions.

Source:China Daily, Xinhua News Agency

Emission goals in China on target for 2020: UN

China is among a select group of nations on track to meet their emission-reduction goals by the end of the decade, according to new data from the United Nations Environment Programme (UNEP).
Brazil, the European Union, India and Russia join China as the global players expected to meet projections ahead of 2020, while other leading countries need to implement added measures to curb their emissions projections, the report said.
“Linking development policies with climate mitigation will help countries build the energy-efficient, low-carbon infrastructures of the future and achieve transformational changes,” Achim Steiner, UNEP’s executive director, said in a statement Wednesday that accompanied the release of the report.
Emissions Gap Report 2014 estimates that emissions need to drop 15 percent or more by 2030 in order to stay in line with the 2 degrees Celsius limit established in 2010 by the UN Climate Change Conference in Mexico. UNEP defines an emission gap as the difference between the projected emission levels in 2025 and 2030.
As part of its efforts to curb carbon emissions, China has started pilot emission-trading programs in seven provinces and municipalities, as well as drafting a comprehensive climate-change law. An emission-trading program is a market-based approach used to control pollution by providing economic incentives for achieving reductions in the emissions of pollutants.
The high end of the UNEP estimate says that by 2020, China could reduce greenhouse-gas emission intensity, or its average emission rate based on production volumes, by up to 40 percent.
The UNEP report shows that a number of countries, including the United States, Canada, Mexico and Australia, are “likely to require further action and/or purchased offsets to meet their pledges”.
Since 1990, global greenhouse-gas emissions have grown by more than 45 percent, based on data from the UNEP.
UNEP findings state that the global emission guardrails that would provide a chance of staying within the limit include, “a peaking of emissions within the next ten years, a halving of all greenhouse gas emissions by mid-century; and in the second half of the century, carbon neutrality followed by net zero total greenhouse gas emissions.”
Steiner, who also serves as the UN’s undersecretary general, said early action on climate-change initiatives could ease pressure on the current goals for greenhouse-gas emission.
“Countries are giving increasing attention to where they realistically need to be by 2025, 2030 and beyond in order to limit a global temperature rise to below 2 degrees Celsius,” Steiner said.
Eventual net zero climate neutrality would be the ultimate goal of these energy initiatives, he said. Net zero emission scenarios imply no input from human activity, where any remaining CO2 emissions would be negated by carbon dioxide uptake, or “negative emissions”.
The UNEP forecast, released just a few weeks ahead of the UN Conference on Climate Change in Lima, Peru (Dec 1-12), calls for global carbon neutrality to be reached between 2055 and 2070.
Andrew Steer, president and CEO of the World Resources Institute (WRI), said in a press release Wednesday: “Negotiating a global climate deal should not be based on emotions or political whims; it should be driven by science and facts. Unfortunately, the world is not currently headed in the right direction.”
“But, with the growing momentum for global climate action, we have the opportunity to close the emissions gap and keep [it] within the limits of what science says is needed to prevent the worst impacts of climate change.”
China intends to peak its carbon dioxide emissions by around 2030 and will make its best efforts to do so early, according to a joint announcement made by China’s President Xi Jinping and US President Barack Obama in Beijing on Nov 12.
Obama also announced a new target to cut US greenhouse-gas emissions between 26 to 28 percent below 2005 levels by 2025, a step forward from its previous pledge of 17 percent by 2020 from 2005 levels.
The pact marks the first time that China has set a time frame to cap its emissions. The world’s second-largest economy also committed to increasing its share of non-fossil fuel energy to about 20 percent by 2030.

Total carbon content and production of coal mines. The inset shows the comparison between carbon content from 602 coal samples and 4,243 coal mines Each dot in the inset indicates the average of carbon content from 602 coal samples and 4,243 coal mines in the same 1°by 1° grid. The nearly one-to-one correlation indicates that samples and mines capture the same spatial variability of coal carbon content across China.

Source: Reduced carbon emission estimates from fossil fuel combustion and cement production in China. Nature, 524, 335-338

Source:China Daily, Xinhua News Agency

Researchers Find Monetary Value Of Air Quality In China

Researchers at the Yale School of Public Health and Peking University have found that Chinese families are willing to invest up to 6 percent of their annual income in efforts to improve air quality.

Published in Ecological Economics on March 7, the study aimed to determine the amount people are willing to pay for efforts to reduce air pollution, such as environmental policies to introduce more electric cars and natural gas heating. The researchers found that on average, families with children under the age of 6 are willing to invest 5.9 percent of their annual income, while families without children under 6 years old are willing to pay 3.3 percent.

“When we get all these values of willingness to pay for major population groups for China, we can let the policymakers know what is the potential demand and how they can match the demand and supply of good air,” said Xi Chen, a lead author on the study and a professor at the School of Public Health.

Xiaobo Zhang, chair of the Peking University economics department and a co-author on the study, emphasized the growing concern of air pollution in China and his interest in studying its impact, as well as solutions to resolving the crisis. Chen said that in recent years, the Chinese government has been increasing environmental regulations in an effort to combat the phenomenon.

Image: The smog under the Zhongyuan Fortune Tower in Zhengzhou (Credits: Sammy Corfield via Wikimedia Commons)

Source: ENN evironment news network

YuChai T4 Project Technical Seminar Was Held Successfully In Our Company

On April ,17 th, Yuchai Machinery Co.,ltd successfully held the technical seminar about catalytic purification for non-road engineering machinery . As an invited guest, our Chief Engineer Mr. Liu Guangwen made a detailed introduction for the domestic T4 emission standard and after-treatment product.

GXLJ become the 9th Batch of Guangxi Engineering Technology Research Center

In accordance with the “Guangxi Engineering Technology Research Center Management regulation”, Guangxi Science and Technology Department organized experts in Nov, 2013 to carry out the inspection to our Engineering technical research center. The center accomplish the task of“Guangxi Engineering Technology Research center set up construction assignment”, meeting the acceptance criteria. After the government audit and publicity,  GXLJ was awarded as Guangxi Engineering technology research center.

Our CEO Together with Other Leaders Participated in Poverty Alleviation

Our group is committed to anti-poverty project and our CEO together with management staff come to Xiatang village, Nankang town to relief of the poor .

With the assistant of Xiatang town village committee, we knew that there are 97 family in poor, especially Xiatang village poverty index is serious, some of the solitary elders in rural areas, their lives are insecure. After visiting to this village on 12th Nov, 2016, our CEO led to donate RMB 3000 to help the poor.