Wuxi Zechuan Environment, a professional manufacturer of RTO incinerators, RTO, RCO, and VCU equipment, excerpted from the VOCs emission reduction workstation on October 21, 2024: "The temperature of combustion Chamber No. 1 is 810℃, and the temperature of the heat storage body is 760℃..." Entering the Combustion Technology and Equipment Research Center of Tsinghua University Wuxi Institute of Applied Technology, the "health" index of over 50 VOCs combustion technology treatment devices is clearly displayed on the large screen. It is learned that Wuxi has taken the lead in the country in promoting enterprises that use combustion treatment facilities to be included in the closed-loop management of standardized operation.
There are over 350 enterprises in Wuxi City that adopt combustion methods for their large emissions and high concentrations of waste gas. Wang Haiming, the chief engineer of the Wuxi Municipal Ecological Environment Bureau, introduced that these enterprises generally have problems such as non-standard operation and maintenance technical standards and incomplete supervision and management systems. The effects of waste gas treatment vary greatly, and "high-efficiency treatment facilities" can easily turn into "centralized sewage discharge facilities", which brings difficulties to supervision.
How can governance facilities be better managed? The Wuxi Municipal Ecological Environment Bureau and the Wuxi Municipal Emergency Management Bureau jointly entrusted the Tsinghua University Wuxi Applied Technology Research Institute to establish the Combustion Method Technology and Equipment Research Center, exploring new regulatory models.
We fully leverage our data resource advantages. By collecting real-time operation data of the treatment facilities of key enterprises in Wuxi for waste gas treatment and applying big data analysis, artificial intelligence and other technologies, we monitor the temperature, pressure, exhaust gas concentration, total VOCs and other parameters of these devices, effectively assisting in precise regulatory measures. Liu Xinghai, deputy director of the Combustion Technology and Equipment Research Center, introduced that relying on the "one network" for online supervision, the center can assist government functional departments in providing immediate early warning and handling for emergencies such as illegal discharges, excessive discharges, and fire alarms.
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"Pipeline damage, inadequate safety protection measures, and the lack of dedicated management can all lead to low equipment utilization efficiency and affect the compliance of waste gas emissions." " Liu Xinghai said that the center has specially formed an expert team to issue a "physical examination report" for the enterprises under monitoring every month, providing a basis for subsequent rectification.
Not long ago, the platform showed that the data of the heat storage body of a chemical enterprise in Yixing fluctuated greatly. After inspection by the expert group, it was found that the relevant components had aged and the control system also needed to be improved. Timely reminders have transformed "post-event handling" into "pre-event prevention", earning the satisfaction of enterprises.
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Ensuring that the equipment operates in the best condition can minimize energy consumption to the greatest extent and truly "relieve the burden" on enterprises. According to rough estimates, if the relevant indicators of a 24-hour operating regenerative thermal oxidizer (RTO) can be improved by 5%, it can save a unit over one million yuan in costs in a year.
In the early stage, the expert team visited and investigated enterprises in Wuxi City that treated waste gas by combustion method, and conducted a survey of over 500 pieces of equipment. They found that the combustion thermal efficiency of many of the equipment was not high, averaging around 80%. After rectification and improvement, it can reach over 90%. An RTO device worth 3 million yuan can recoup its investment within three to four years if its operational efficiency can be effectively improved. Liu Xinghai did the math.
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Understand the equipment, manage it well and use it properly. Wuxi City will lead more enterprises that treat waste gas by combustion method to join the "big family" of the central service platform with its exemplary effect, and promote the level of environmental governance to a new stage.
The approach taken by the Wuxi Ecological Environment Bureau is highly worthy of promotion and reference across the country. Besides scientific design and one-time construction to meet standards for operation, what truly reflects scientific and low-carbon development in VOCs incineration facilities is the subsequent reasonable, compliant and scientific operation and maintenance investment. However, this is currently a clear shortcoming in the entire industry, especially for "efficient" facilities such as RTO and RCO. In addition, there are a large number of so-called "catalytic incineration facilities" such as "activated carbon adsorption and desorption +CO", which are not subject to continuous health "check-ups" and are installed all at once. As a result, enterprises have not truly mastered how to keep them in the best operating condition, and regulatory authorities are also unable to control the red line safety of these incineration process equipment in real time!
The concept of an efficient VOCs treatment facility should be the one that is most suitable for the enterprise's working conditions. It is not the case that the incineration device with high initial investment and operation and maintenance costs is an efficient facility.
