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Non-toxic denitration catalyst, six questions

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Non-toxic denitration catalyst, six questions

January 5th, 2015 China Denitrification Network News: At the beginning of the new year, with the release of the Shandong Environmental Protection Bureau Luhuan Office Letter [2014] No. 166, a discussion on local standards for denitrification catalysts in Shandong is underway in the industry. For a time, the industry was uproared and the opinions varied.

According to the requirements of this document, local standards for the “Technical Requirements for Selective Catalytic Reduction (SCR) DeNOx Catalysts in Shandong Province” need to be certified and implemented throughout Shandong. Starting from December 21, 2014, all relevant enterprises and units in Shandong Province shall produce, sell, purchase, and use catalytic reduction denitration catalysts in accordance with the “Technical Requirements”. All denitration catalysts that do not meet the "Technical Requirements" must not be produced, sold, recycled or disposed of in our province. Enterprises and companies that need to use nitrogen oxides for selective catalytic reduction must not purchase denitrification catalysts that contain toxic and hazardous substances such as vanadium pentoxide. After the implementation of the "Technical Requirement", enterprises and units that use poisonous and harmful denitrification catalysts are still purchased. Governments at all levels must not provide financial and policy support.

The document also requires that enterprises and units that have put into use toxic and harmful denitration catalysts before the implementation of the "Technical Requirements" must replace the non-toxic and harmless catalysts that meet the "Technical Requirements" when the denitrification catalysts are mechanically damaged or expired; The use unit shall strengthen the management of poisonous and harmful denitrification catalysts that have been eliminated, and shall not stack, transport or regenerate them randomly. The original manufacturer shall be responsible for promptly recovering or submitting units that have the qualification for handling hazardous wastes for disposal.

The document indicates that the municipal environmental protection bureaus must strengthen the supervision and control of enterprises and units that manufacture, sell, use, regenerate, and dispose of denitrification catalysts. The toxic and harmful denitration catalysts that have been replaced must be incorporated into hazardous waste management, and secondary pollution, especially groundwater pollution, must be strictly prevented to ensure environmental safety.

As the local standard was drafted by Shandong Tianyi Environmental Protection Technology Co., Ltd., under the provisions of the document, only Tianyi's environmental protection products can meet this standard, and all other manufacturers will be rejected by the standard. There are many questions about the standard, summed up, there are the following major questions:

Question: The scientific nature of the standard

The standard is based on non-toxic denitrification catalysts. According to Tianzhu's environmental protection product description, the catalyst is based on Al-Ti-Si honeycomb ceramics, and uses rare earths to incorporate transition metal composite oxides. Therefore, it is different from vanadium-based denitration catalysts and non-toxic.

As we all know, the toxicity of vanadium is mainly reflected in the inhalation of dust or smoke containing high concentrations of vanadium compounds in a short time, it will cause eye and respiratory mucosa irritation. However, many rare earth elements (such as lanthanum, cerium, etc.) and many rare metal elements (such as tungsten, molybdenum, zirconium, manganese, etc.) have different degrees of toxicity under certain conditions. From a scientific point of view, this is not a non-white or black question, but it needs to be defined by quantitative qualitative analysis under certain conditions.

After long-term operation, the denitration catalyst will deposit a large number of harmful heavy metal elements such as arsenic, mercury, cadmium, and lead from the flue gas. Therefore, the country has incorporated wasteful denitrification catalysts into hazardous waste management. From this perspective, the non-toxic concept of a non-toxic denitrification catalyst does not have any correlation with the catalyst operation regeneration and final disposal.

Second question: the completeness of the standard

The standard has major flaws in terms of content integrity. In terms of physical and chemical indicators, the targeted conversion rate of SO2/SO3 is ≤ 0.4% and the V2O5 content must not be detected. However, it does not describe and define the key components of non-toxic catalysts, resulting in major defects. Since it is a selective catalytic reduction (SCR) denitration catalyst, the flue gas needs to react under the action of a certain catalytic element. The unlisted of this key index constitutes an incomplete standard. According to the description of non-toxic catalyst, this product uses rare earth as the main active component, and uses aluminum-titanium-silicon honeycomb ceramic as carrier to incorporate transition metal composite oxide. This standard, which lacks key elements, will feel at a loss regardless of catalyst production or user acceptance.

Similarly, there are doubts about the normal operating conditions of the catalyst used in the standard, such as the operating temperature, the SO2 content of the flue gas, and the CaO content. Many vanadium-based catalysts have achieved far more performance than this standard.

The test methods and inspection rules corresponding to the standard requirements also have similar problems.

Three questions: standard representation

At present, non-toxic denitrification catalysts are only produced by Shandong Tianyi Environmental Protection Technology Co., Ltd., and nearly 100 other enterprises in the country all produce vanadium-based denitration catalysts. Therefore, the use of a company’s products as a benchmark to formulate local standards and cover the entire region seems to be tailor-made, and its industry representative is obviously insufficient.

The formulation of the standard itself requires the representativeness and coverage of the industry, the need to be able to represent the product quality and technical level with higher quality in the industry, and the need to be able to become the benchmark that can be achieved or achieved in regulating the quality of products in the industry. A standard that lacks industry representation can only serve as a corporate standard. The lack of scientific argumentation and the establishment of an industry or local standard over a single corporate standard will inevitably give people a feeling of misplacement or endorsement.

Four questions: Applicability of the standard

According to Tianzhu Environmental Protection's website, the company relies on the State Key Laboratory of Materials Chemical Engineering of Nanjing University of Technology to develop a rare-earth-based high-efficiency non-toxic flue gas denitrification catalyst with China's independent intellectual property rights, which is the first and only in China and the world. A national high-tech environmental protection enterprise engaged in R&D, design, manufacture and engineering implementation of a new type of high-efficiency non-toxic flue gas denitrification catalyst. This technology “fills in the gaps in non-toxic and denitrification catalyst technology for flue gas at home and abroad, and its technical performance has reached International leading level."

As can be seen from the above description, the company's technical and non-toxic catalyst products have uniqueness at home and even in the world. Therefore, the uniqueness of its products determines that the standard is difficult to apply to all other manufacturers and it is difficult to cover the entire denitrification catalyst industry.

Five questions: standard mandatory

According to the "Standardization Law of the People's Republic of China", national standards and industry standards are divided into mandatory standards and recommended standards. The standards for the protection of human health, personal and property safety, and standards enforced by laws and administrative regulations are mandatory standards. Other standards are recommended standards. The local standards for the safety and hygiene requirements of industrial products formulated by the administrative departments for standardization of provinces, autonomous regions, and municipalities directly under the Central Government shall be mandatory standards within their administrative regions. Mandatory standards must be implemented, and the recommended standards countries encourage enterprises to voluntarily adopt them.

From the point of view of Document 166, the standard should incorporate standards into mandatory management from the perspective of security. Although it is mandatory, it has a great deviation from the actual foundation of the industry, and its operability is not strong and it is difficult to implement.

From the aspect of catalyst production, there are already more than a dozen denitrification catalyst companies in Shandong, all producing vanadium-based denitration catalysts. Many companies have been producing for many years, and two companies have even introduced advanced foreign technologies to produce them. The overall production technology of vanadium-based denitration catalysts is mature and the product quality is stable and reliable. The non-toxic and denitrification catalyst is currently in industrial production. Because it is an exclusive production, many aspects are due to technical monopoly or confidentiality, and it is difficult to effectively verify. Therefore, under this pattern, the mandatory is slightly biased.

From the viewpoint of the use of catalysts, vanadium-based denitration catalysts have been applied in many fields, such as domestic and foreign power plants, industrial boilers, kilns, etc., for a wide range of long-term industrial applications. For users, only products that have been extensively tested by industry, are reliable, and competitively priced are the preferred purchases. The non-toxic denitrification catalyst is late due to its late start, and its current application performance is very limited. At the same time, due to the beginning of supply, even if the installed catalyst is still in operation, the 24000h operation test has not yet been completed. Therefore, industrial verification of non-toxic catalysts will take time to observe. In addition, it is worth noting that Shandong Province has a lot of five major power subordinate power plants as central enterprises, so the implementation of this standard remains to be seen. Therefore, in this state, the mandatory foundation is slightly weaker.

Six Questions: Standard Timeliness

According to the provisions of Article 6 of Chapter 2 of the "Standardization Law of the People's Republic of China," local standards can be formulated for the safety and hygiene requirements of industrial products that do not have national standards and industry standards but need to be unified within the provinces, autonomous regions, and municipalities directly under the Central Government. Local standards shall be formulated by the administrative departments of standardization of the provinces, autonomous regions, and municipalities directly under the Central Government, and reported to the competent department of standardization administration under the State Council and the relevant administrative department of the State Council for the record. After the publication of national or industrial standards, the local standards will be abolished.

At present, the standards for cellular denitration catalysts and plate denitration catalysts have undergone several rounds of discussions and revisions, and have been drafted for review. They have entered the review stage and are expected to be promulgated in 2015. According to the above-mentioned provisions of the standardization law, local standards for denitrification catalysts in Shandong will be abolished after the publication of national standards, so its timeliness is limited. Of course, it is not ruled out that local amendments or adjustments should be made on the basis of this standard in order to distinguish it from national standards and continue to exist.

From the above questions, it is not difficult to see the reasons for the fierce debate in the industry. It is a good thing that local standards precede national standards. However, the formulation of standards requires scientific rigour, requires representativeness, and needs to be accepted by the industry. Only standards that are praised by everyone can be easily implemented and implemented. The author believes that with the implementation of the standard, the dispute surrounding toxic and innocuity will continue and even the game will be open and intensified. Therefore, we look forward to the introduction of national standards as soon as possible in order to establish a unified standard for the denitrification catalyst industry!